From patchwork Sat May 2 03:22:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Almeida X-Patchwork-Id: 63504 Received: from vger.kernel.org ([23.128.96.18]) by www.linuxtv.org with esmtp (Exim 4.92) (envelope-from ) id 1jUigU-007NUh-Tb; Sat, 02 May 2020 03:19:23 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726799AbgEBDWd (ORCPT + 1 other); Fri, 1 May 2020 23:22:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39878 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726439AbgEBDWc (ORCPT ); Fri, 1 May 2020 23:22:32 -0400 Received: from mail-qt1-x841.google.com (mail-qt1-x841.google.com [IPv6:2607:f8b0:4864:20::841]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 59EA1C061A0C; Fri, 1 May 2020 20:22:32 -0700 (PDT) Received: by mail-qt1-x841.google.com with SMTP id g16so5554371qtp.11; Fri, 01 May 2020 20:22:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=/bMUwdeTMh2W9i+EOVv7dhyz664fp1ziAg67LLNKBOI=; b=FANSfkIBdsdts7VxUCboxxpikHryJy5QikgpmBM55Bp0YmsRcr6F3V9jQC0D0K+/5R qZouMJxes353v5Y/J9marUqnDfGkurq74bDqdW0ngcsEdE0PZwq//bV6b6RAsGj7SeJW 3hU0bqn36fz0CRuLqNOsVNdWxfQByyzIhXjrdUHLq6m3++HH41fy2JC9a3IW9x6v8pmK nKizn31xWpquTXYzYPnrL/iP4/mi590dvWrc3NpkvQk8FLGvEAuH1hhJAFBAvToWasDt nZZ4FFgCvB1vMgFPgso+O0yCRLYXGYVRkp0wwTR88WGgmduCgCzYFj5m5pVBFyM2oWZE ZQSA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=/bMUwdeTMh2W9i+EOVv7dhyz664fp1ziAg67LLNKBOI=; b=JprLfl9yXo5oryIxJ93YiA+JcaDfKSRWGKXA/FDZOwTWdKl+eC5w8b9VVPBhWSks1B vaslTrhcJkmEE1j+x1+/m/slXRTitdtzv6vYfUsinQT6B0EjZ8YyWJuunelvL4bb5fl8 eICr//euefRBo2qIvvGewJJWMQ/Od02mZokE4td8iWsA7zD6m6pSKjDptPhI+dzjAQes K7ykVKLjgzvHWEmGbloU7CP82AHY6NaYKsycCq4rmmZEhLXHVzzTr3+slaifb6hcaweV K871r5tgvBwoWHdk5NClgikXsZ5eLYXFd75ooREcAn3R06BmLeu5p6iUHBUkfriLs7Bu long== X-Gm-Message-State: AGi0PuZuYxrxdfCjWqh+5mFKzNIv1JjSsNniPnxJHT+g4uHgX4BJB8NX Co8BRjrEVvzUI1+wUF9RU1I= X-Google-Smtp-Source: APiQypIMzIR8/Ng+dJ8wepy8MQb8xYjhyQiwV+O/vZXG3B+0Pm9D2SiwKiqUSQBBz3qvj1cFVYEXYA== X-Received: by 2002:ac8:4c8d:: with SMTP id j13mr6830790qtv.142.1588389751538; Fri, 01 May 2020 20:22:31 -0700 (PDT) Received: from localhost.localdomain ([2804:18:602b:723a:1b2a:57a1:a611:34ed]) by smtp.gmail.com with ESMTPSA id c41sm4410399qta.96.2020.05.01.20.22.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 May 2020 20:22:31 -0700 (PDT) From: "Daniel W. S. Almeida" X-Google-Original-From: Daniel W. S. Almeida To: mchehab+huawei@kernel.org, sean@mess.org, kstewart@linuxfoundation.org, allison@lohutok.net, tglx@linutronix.de Cc: "Daniel W. S. Almeida" , linux-media@vger.kernel.org, skhan@linuxfoundation.org, linux-kernel-mentees@lists.linuxfoundation.org, linux-kernel@vger.kernel.org Subject: [RFC, WIP, v4 01/11] media: vidtv: add Kconfig entry Date: Sat, 2 May 2020 00:22:06 -0300 Message-Id: <20200502032216.197977-2-dwlsalmeida@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200502032216.197977-1-dwlsalmeida@gmail.com> References: <20200502032216.197977-1-dwlsalmeida@gmail.com> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-LSpam-Score: -2.5 (--) X-LSpam-Report: No, score=-2.5 required=5.0 tests=BAYES_00=-1.9,DKIM_SIGNED=0.1,DKIM_VALID=-0.1,DKIM_VALID_AU=-0.1,FREEMAIL_FORGED_FROMDOMAIN=0.001,FREEMAIL_FROM=0.001,HEADER_FROM_DIFFERENT_DOMAINS=0.5,MAILING_LIST_MULTI=-1 autolearn=ham autolearn_force=no From: "Daniel W. S. Almeida" Add the necessary Kconfig entries and a dummy Makefile to compile the new virtual DVB test driver (vidtv). Signed-off-by: Daniel W. S. Almeida --- drivers/media/test-drivers/Kconfig | 10 ++++++++++ drivers/media/test-drivers/Makefile | 1 + drivers/media/test-drivers/vidtv/Kconfig | 11 +++++++++++ drivers/media/test-drivers/vidtv/Makefile | 2 ++ 4 files changed, 24 insertions(+) create mode 100644 drivers/media/test-drivers/vidtv/Kconfig create mode 100644 drivers/media/test-drivers/vidtv/Makefile diff --git a/drivers/media/test-drivers/Kconfig b/drivers/media/test-drivers/Kconfig index 188381c855939..7d273a8a7acc2 100644 --- a/drivers/media/test-drivers/Kconfig +++ b/drivers/media/test-drivers/Kconfig @@ -4,6 +4,10 @@ menuconfig V4L_TEST_DRIVERS bool "V4L test drivers" depends on VIDEO_DEV +menuconfig DVB_TEST_DRIVERS + bool "DVB test drivers" + depends on DVB_CORE && MEDIA_SUPPORT && I2C + if V4L_TEST_DRIVERS source "drivers/media/test-drivers/vimc/Kconfig" @@ -24,3 +28,9 @@ config VIDEO_VIM2M source "drivers/media/test-drivers/vicodec/Kconfig" endif #V4L_TEST_DRIVERS + +if DVB_TEST_DRIVERS + +source "drivers/media/test-drivers/vidtv/Kconfig" + +endif #DVB_TEST_DRIVERS diff --git a/drivers/media/test-drivers/Makefile b/drivers/media/test-drivers/Makefile index 74410d3a9f2d2..9f0e4ebb2efe7 100644 --- a/drivers/media/test-drivers/Makefile +++ b/drivers/media/test-drivers/Makefile @@ -7,3 +7,4 @@ obj-$(CONFIG_VIDEO_VIMC) += vimc/ obj-$(CONFIG_VIDEO_VIVID) += vivid/ obj-$(CONFIG_VIDEO_VIM2M) += vim2m.o obj-$(CONFIG_VIDEO_VICODEC) += vicodec/ +obj-$(CONFIG_DVB_VIDTV) += vidtv/ diff --git a/drivers/media/test-drivers/vidtv/Kconfig b/drivers/media/test-drivers/vidtv/Kconfig new file mode 100644 index 0000000000000..22c4fd39461f1 --- /dev/null +++ b/drivers/media/test-drivers/vidtv/Kconfig @@ -0,0 +1,11 @@ +# SPDX-License-Identifier: GPL-2.0-only +config DVB_VIDTV + tristate "Virtual DVB Driver (vidtv)" + depends on DVB_CORE && MEDIA_SUPPORT && I2C + help + The virtual DVB test driver serves as a reference DVB driver and helps + validate the existing APIs in the media subsystem. It can also aid developers + working on userspace applications. + + + When in doubt, say N. diff --git a/drivers/media/test-drivers/vidtv/Makefile b/drivers/media/test-drivers/vidtv/Makefile new file mode 100644 index 0000000000000..d1558d84eeaed --- /dev/null +++ b/drivers/media/test-drivers/vidtv/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0 + From patchwork Sat May 2 03:22:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Almeida X-Patchwork-Id: 63505 Received: from vger.kernel.org ([23.128.96.18]) by www.linuxtv.org with esmtp (Exim 4.92) (envelope-from ) id 1jUigX-007NUh-3i; Sat, 02 May 2020 03:19:26 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726951AbgEBDWh (ORCPT + 1 other); Fri, 1 May 2020 23:22:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39892 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726439AbgEBDWg (ORCPT ); Fri, 1 May 2020 23:22:36 -0400 Received: from mail-qk1-x744.google.com (mail-qk1-x744.google.com [IPv6:2607:f8b0:4864:20::744]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A8076C061A0C; Fri, 1 May 2020 20:22:36 -0700 (PDT) Received: by mail-qk1-x744.google.com with SMTP id q7so11245119qkf.3; Fri, 01 May 2020 20:22:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=vOfGhTh2Jo/NyvBbJBpC6oj9kdoBU+4VAUZ3CEi4qes=; b=McUTt5gLkXayOgiy5NBbinWpsfM6qbr0a2WqnbFVMTs6HC8DyDbzDRFty0Os3voy/a 0vo5JKuYUD88ET2JEpnb/nRPNr1ZK0mqeYHXjzjEGD1rHZ2J51bSKGzbEPAIpoDdii1c wx4sGEJLJvHmvPwIVkfy4gD7NXCx1GdlebdUX/4WM4nbBrhrEWtE40N4s1jxgCx8z4ps 13I4llZPcnJIcTfPVZMM5k+fbhgDlaaFDGDkaa4uABQeKAHtVYzg4Mzwlvycwk1+e42q L23+JsG+XrIHFKcRboNqOdRWGtwnf0v6VlznbBT4eSZty+LG5Siyiv9/iuZBpuCN2jOM Y4Kg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=vOfGhTh2Jo/NyvBbJBpC6oj9kdoBU+4VAUZ3CEi4qes=; b=LdwYAszx+RjTqUAKEcX3T3uq5+5ruZesLhEu4w6wtYhazZ0qNkXYaUfCsiAvnyw8un ZR6TbzFg/H5uNcYKQDb5PF/EEtiMJzQKhvCsbRi0F6QCxBGmp5U0glT1Z3OAq9BqtaPv d2WG6Ak65wo47OfVrdYkj9I/03T6nMtHTzi4nuVtkANjwQakGJVeLm31a2Lr+qqDP6y+ HiXt4qH6vmoSFmLew0cht61JODJ4M8ANC4ovvmslh28nwX2oLJACuhMWY82tByMYzHqV 3EU8XhnaLgLhiLbGtYnUlVibSPAFGSS9etzEW/uGOOu3b4gWQOvomKjrPrL9N9FyyRmV 2YPw== X-Gm-Message-State: AGi0PubZcc5enmC1BLI27tioAkkCFvL5aRcUS897DjTcQ/QhMD2vDUFc 8Hff1GGfjnQGVWOl4NPWqPY= X-Google-Smtp-Source: APiQypJiotM5yN7QEX9KKPF6Q0K91HaEi84ECXmMB7K6p/rS8CQuozEN8guj7EmLXhdVJtw7/5rfAg== X-Received: by 2002:ae9:e214:: with SMTP id c20mr6717000qkc.107.1588389755774; Fri, 01 May 2020 20:22:35 -0700 (PDT) Received: from localhost.localdomain ([2804:18:602b:723a:1b2a:57a1:a611:34ed]) by smtp.gmail.com with ESMTPSA id c41sm4410399qta.96.2020.05.01.20.22.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 May 2020 20:22:35 -0700 (PDT) From: "Daniel W. S. Almeida" X-Google-Original-From: Daniel W. S. Almeida To: mchehab+huawei@kernel.org, sean@mess.org, kstewart@linuxfoundation.org, allison@lohutok.net, tglx@linutronix.de Cc: "Daniel W. S. Almeida" , linux-media@vger.kernel.org, skhan@linuxfoundation.org, linux-kernel-mentees@lists.linuxfoundation.org, linux-kernel@vger.kernel.org Subject: [RFC, WIP, v4 02/11] media: vidtv: implement a tuner driver Date: Sat, 2 May 2020 00:22:07 -0300 Message-Id: <20200502032216.197977-3-dwlsalmeida@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200502032216.197977-1-dwlsalmeida@gmail.com> References: <20200502032216.197977-1-dwlsalmeida@gmail.com> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-LSpam-Score: -2.5 (--) X-LSpam-Report: No, score=-2.5 required=5.0 tests=BAYES_00=-1.9,DKIM_SIGNED=0.1,DKIM_VALID=-0.1,DKIM_VALID_AU=-0.1,FREEMAIL_FORGED_FROMDOMAIN=0.001,FREEMAIL_FROM=0.001,HEADER_FROM_DIFFERENT_DOMAINS=0.5,MAILING_LIST_MULTI=-1 autolearn=ham autolearn_force=no From: "Daniel W. S. Almeida" The virtual DVB test driver serves as a reference DVB driver and helps validate the existing APIs in the media subsystem. It can also aid developers working on userspace applications. This dummy tuner should support common TV standards such as DVB-T/T2/S/S2, ISDB-T and ATSC when completed. Signed-off-by: Daniel W. S. Almeida --- drivers/media/test-drivers/vidtv/Makefile | 1 + .../media/test-drivers/vidtv/vidtv_tuner.c | 411 ++++++++++++++++++ 2 files changed, 412 insertions(+) create mode 100644 drivers/media/test-drivers/vidtv/vidtv_tuner.c diff --git a/drivers/media/test-drivers/vidtv/Makefile b/drivers/media/test-drivers/vidtv/Makefile index d1558d84eeaed..e625810a82603 100644 --- a/drivers/media/test-drivers/vidtv/Makefile +++ b/drivers/media/test-drivers/vidtv/Makefile @@ -1,2 +1,3 @@ # SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_DVB_VIDTV) += vidtv_tuner.o diff --git a/drivers/media/test-drivers/vidtv/vidtv_tuner.c b/drivers/media/test-drivers/vidtv/vidtv_tuner.c new file mode 100644 index 0000000000000..a790508f935b3 --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_tuner.c @@ -0,0 +1,411 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * The Virtual DVB test driver serves as a reference DVB driver and helps + * validate the existing APIs in the media subsystem. It can also aid + * developers working on userspace applications. + * + * The vidtv tuner should support common TV standards such as + * DVB-T/T2/S/S2, ISDB-T and ATSC when completed. + * + * Written by Daniel W. S. Almeida + */ + +#include +#include +#include +#include +#include +#include + +MODULE_DESCRIPTION("Virtual DTV Tuner"); +MODULE_AUTHOR("Daniel W. S. Almeida"); +MODULE_LICENSE("GPL"); + +struct vidtv_tuner_config { + struct dvb_frontend *fe; + u32 mock_power_up_delay_msec; + u32 mock_tune_delay_msec; + u32 vidtv_valid_dvb_t_freqs[8]; + u32 vidtv_valid_dvb_c_freqs[8]; + u32 vidtv_valid_dvb_s_freqs[8]; + u8 max_frequency_shift_hz; +}; + +struct vidtv_tuner_cnr_to_qual_s { + /* attempt to use the same values as libdvbv5 */ + u32 modulation; + u32 fec; + u32 cnr_ok, cnr_good; +}; + +struct vidtv_tuner_cnr_to_qual_s vidtv_tuner_c_cnr_2_qual[] = { + /* from libdvbv5 source code, in milli db */ + { QAM_256, FEC_NONE, 34000, 38000}, + { QAM_64, FEC_NONE, 30000, 34000}, +}; + +struct vidtv_tuner_cnr_to_qual_s vidtv_tuner_s_cnr_2_qual[] = { + /* from libdvbv5 source code, in milli db */ + { QPSK, FEC_1_2, 7000, 10000}, + + { QPSK, FEC_2_3, 9000, 12000}, + { QPSK, FEC_3_4, 10000, 13000}, + { QPSK, FEC_5_6, 11000, 14000}, + + { QPSK, FEC_7_8, 12000, 15000}, +}; + +struct vidtv_tuner_cnr_to_qual_s vidtv_tuner_s2_cnr_2_qual[] = { + /* from libdvbv5 source code, in milli db */ + { QPSK, FEC_1_2, 9000, 12000}, + { QPSK, FEC_2_3, 11000, 14000}, + { QPSK, FEC_3_4, 12000, 15000}, + { QPSK, FEC_5_6, 12000, 15000}, + { QPSK, FEC_8_9, 13000, 16000}, + { QPSK, FEC_9_10, 13500, 16500}, + { PSK_8, FEC_2_3, 14500, 17500}, + { PSK_8, FEC_3_4, 16000, 19000}, + { PSK_8, FEC_5_6, 17500, 20500}, + { PSK_8, FEC_8_9, 19000, 22000}, +}; + +static struct vidtv_tuner_cnr_to_qual_s vidtv_tuner_t_cnr_2_qual[] = { + /* from libdvbv5 source code, in milli db*/ + { QPSK, FEC_1_2, 4100, 5900}, + { QPSK, FEC_2_3, 6100, 9600}, + { QPSK, FEC_3_4, 7200, 12400}, + { QPSK, FEC_5_6, 8500, 15600}, + { QPSK, FEC_7_8, 9200, 17500}, + + { QAM_16, FEC_1_2, 9800, 11800}, + { QAM_16, FEC_2_3, 12100, 15300}, + { QAM_16, FEC_3_4, 13400, 18100}, + { QAM_16, FEC_5_6, 14800, 21300}, + { QAM_16, FEC_7_8, 15700, 23600}, + + { QAM_64, FEC_1_2, 14000, 16000}, + { QAM_64, FEC_2_3, 19900, 25400}, + { QAM_64, FEC_3_4, 24900, 27900}, + { QAM_64, FEC_5_6, 21300, 23300}, + { QAM_64, FEC_7_8, 22000, 24000}, +}; + +struct vidtv_tuner_hardware_state { + bool asleep; + u32 lock_status; + u32 if_frequency; + u32 tuned_frequency; + u32 bandwidth; +}; + +struct vidtv_tuner_dev { + struct dvb_frontend *fe; + struct vidtv_tuner_hardware_state hw_state; + struct vidtv_tuner_config config; +}; + +static struct vidtv_tuner_dev* +vidtv_tuner_get_dev(struct dvb_frontend *fe) +{ + struct i2c_client *client = fe->tuner_priv; + + return i2c_get_clientdata(client); +} + +static s32 vidtv_tuner_check_frequency_shift(struct dvb_frontend *fe) +{ + struct vidtv_tuner_dev *tuner_dev = vidtv_tuner_get_dev(fe); + struct dtv_frontend_properties *c = &fe->dtv_property_cache; + struct vidtv_tuner_config config = tuner_dev->config; + u32 *valid_freqs = NULL; + u32 array_sz = 0; + u32 i; + u32 shift; + + switch (c->delivery_system) { + case SYS_DVBT: + case SYS_DVBT2: + valid_freqs = config.vidtv_valid_dvb_t_freqs; + array_sz = ARRAY_SIZE(config.vidtv_valid_dvb_t_freqs); + break; + case SYS_DVBS: + case SYS_DVBS2: + valid_freqs = config.vidtv_valid_dvb_s_freqs; + array_sz = ARRAY_SIZE(config.vidtv_valid_dvb_s_freqs); + break; + case SYS_DVBC_ANNEX_A: + valid_freqs = config.vidtv_valid_dvb_c_freqs; + array_sz = ARRAY_SIZE(config.vidtv_valid_dvb_c_freqs); + break; + + default: + pr_warn("%s: unsupported delivery system: %u\n", + __func__, + c->delivery_system); + break; + } + + for (i = 0; i < array_sz; i++) { + shift = abs(c->frequency - valid_freqs[i]); + + if (!shift) + return 0; + + /* + * This will provide a value from 0 to 100 that would + * indicate how far is the tuned frequency from the + * right one. + */ + if (shift < config.max_frequency_shift_hz) + return shift * 100 / config.max_frequency_shift_hz; + } + + return -1; +} + +static int +vidtv_tuner_get_signal_strength(struct dvb_frontend *fe, u16 *strength) +{ + struct dtv_frontend_properties *c = &fe->dtv_property_cache; + struct vidtv_tuner_cnr_to_qual_s *cnr2qual = NULL; + u32 array_size = 0; + s32 shift; + u32 i; + + shift = vidtv_tuner_check_frequency_shift(fe); + + switch (c->delivery_system) { + case SYS_DVBT: + case SYS_DVBT2: + cnr2qual = vidtv_tuner_t_cnr_2_qual; + array_size = ARRAY_SIZE(vidtv_tuner_t_cnr_2_qual); + break; + + case SYS_DVBS: + cnr2qual = vidtv_tuner_s_cnr_2_qual; + array_size = ARRAY_SIZE(vidtv_tuner_s_cnr_2_qual); + break; + + case SYS_DVBS2: + cnr2qual = vidtv_tuner_s2_cnr_2_qual; + array_size = ARRAY_SIZE(vidtv_tuner_s2_cnr_2_qual); + break; + + case SYS_DVBC_ANNEX_A: + cnr2qual = vidtv_tuner_c_cnr_2_qual; + array_size = ARRAY_SIZE(vidtv_tuner_c_cnr_2_qual); + break; + + default: + pr_warn("%s: unsupported delivery system: %u\n", + __func__, + c->delivery_system); + return -EINVAL; + } + + for (i = 0; i <= array_size; i++) { + if (cnr2qual[i].modulation != c->modulation || + cnr2qual[i].fec != c->fec_inner) + continue; + + if (!shift) { + *strength = cnr2qual[i].cnr_good; + return 0; + } + if (shift < 0) { /* Channel not tuned */ + *strength = 0; + return 0; + } + /* + * Channel tuned at wrong frequency. Simulate that the + * Carrier S/N ratio is not too good. + */ + + *strength = cnr2qual[i].cnr_ok - + (cnr2qual[i].cnr_good - cnr2qual[i].cnr_ok); + return 0; + } + + /* + * do a linear interpolation between 34dB and 10dB if we can't + * match against the table + */ + *strength = 34 - 24 * shift / 100; + return 0; +} + +static int vidtv_tuner_init(struct dvb_frontend *fe) +{ + struct vidtv_tuner_dev *tuner_dev = vidtv_tuner_get_dev(fe); + struct vidtv_tuner_config config = tuner_dev->config; + + msleep_interruptible(config.mock_power_up_delay_msec); + + tuner_dev->hw_state.asleep = false; + tuner_dev->hw_state.if_frequency = 5000; + + return 0; +} + +static int vidtv_tuner_sleep(struct dvb_frontend *fe) +{ + struct vidtv_tuner_dev *tuner_dev = vidtv_tuner_get_dev(fe); + + tuner_dev->hw_state.asleep = true; + return 0; +} + +static int vidtv_tuner_suspend(struct dvb_frontend *fe) +{ + struct vidtv_tuner_dev *tuner_dev = vidtv_tuner_get_dev(fe); + + tuner_dev->hw_state.asleep = true; + return 0; +} + +static int vidtv_tuner_resume(struct dvb_frontend *fe) +{ + struct vidtv_tuner_dev *tuner_dev = vidtv_tuner_get_dev(fe); + + tuner_dev->hw_state.asleep = false; + return 0; +} + +static int vidtv_tuner_set_params(struct dvb_frontend *fe) +{ + struct vidtv_tuner_dev *tuner_dev = vidtv_tuner_get_dev(fe); + struct vidtv_tuner_config config = tuner_dev->config; + struct dtv_frontend_properties *c = &fe->dtv_property_cache; + u32 min_freq = fe->ops.tuner_ops.info.frequency_min_hz; + u32 max_freq = fe->ops.tuner_ops.info.frequency_max_hz; + u32 min_bw = fe->ops.tuner_ops.info.bandwidth_min; + u32 max_bw = fe->ops.tuner_ops.info.bandwidth_max; + + if (c->frequency < min_freq || c->frequency > max_freq || + c->bandwidth_hz < min_bw || c->bandwidth_hz > max_bw) { + tuner_dev->hw_state.lock_status = 0; + return -EINVAL; + } + + tuner_dev->hw_state.tuned_frequency = c->frequency; + tuner_dev->hw_state.bandwidth = c->bandwidth_hz; + tuner_dev->hw_state.lock_status = TUNER_STATUS_LOCKED; + + msleep_interruptible(config.mock_tune_delay_msec); + return 0; +} + +static int vidtv_tuner_set_config(struct dvb_frontend *fe, + void *priv_cfg) +{ + struct vidtv_tuner_dev *tuner_dev = vidtv_tuner_get_dev(fe); + + memcpy(&tuner_dev->config, priv_cfg, sizeof(tuner_dev->config)); + + return 0; +} + +static int vidtv_tuner_get_frequency(struct dvb_frontend *fe, + u32 *frequency) +{ + struct vidtv_tuner_dev *tuner_dev = vidtv_tuner_get_dev(fe); + + *frequency = tuner_dev->hw_state.tuned_frequency; + + return 0; +} + +static int vidtv_tuner_get_bandwidth(struct dvb_frontend *fe, + u32 *bandwidth) +{ + struct vidtv_tuner_dev *tuner_dev = vidtv_tuner_get_dev(fe); + + *bandwidth = tuner_dev->hw_state.bandwidth; + + return 0; +} + +static int vidtv_tuner_get_if_frequency(struct dvb_frontend *fe, + u32 *frequency) +{ + struct vidtv_tuner_dev *tuner_dev = vidtv_tuner_get_dev(fe); + + *frequency = tuner_dev->hw_state.if_frequency; + + return 0; +} + +static int vidtv_tuner_get_status(struct dvb_frontend *fe, u32 *status) +{ + struct vidtv_tuner_dev *tuner_dev = vidtv_tuner_get_dev(fe); + + *status = tuner_dev->hw_state.lock_status; + + return 0; +} + +static const struct dvb_tuner_ops vidtv_tuner_ops = { + .init = vidtv_tuner_init, + .sleep = vidtv_tuner_sleep, + .suspend = vidtv_tuner_suspend, + .resume = vidtv_tuner_resume, + .set_params = vidtv_tuner_set_params, + .set_config = vidtv_tuner_set_config, + .get_bandwidth = vidtv_tuner_get_bandwidth, + .get_frequency = vidtv_tuner_get_frequency, + .get_if_frequency = vidtv_tuner_get_if_frequency, + .get_status = vidtv_tuner_get_status, + .get_rf_strength = vidtv_tuner_get_signal_strength +}; + +static const struct i2c_device_id vidtv_tuner_i2c_id_table[] = { + {"vidtv_tuner", 0}, + {} +}; +MODULE_DEVICE_TABLE(i2c, vidtv_tuner_i2c_id_table); + +static int vidtv_tuner_i2c_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct vidtv_tuner_config *config = client->dev.platform_data; + struct dvb_frontend *fe = config->fe; + struct vidtv_tuner_dev *tuner_dev = NULL; + + tuner_dev = kzalloc(sizeof(*tuner_dev), GFP_KERNEL); + if (!tuner_dev) + return -ENOMEM; + + tuner_dev->fe = config->fe; + i2c_set_clientdata(client, tuner_dev); + + memcpy(&fe->ops.tuner_ops, + &vidtv_tuner_ops, + sizeof(struct dvb_tuner_ops)); + + fe->tuner_priv = client; + + return 0; +} + +static int vidtv_tuner_i2c_remove(struct i2c_client *client) +{ + struct vidtv_tuner_dev *tuner_dev = i2c_get_clientdata(client); + struct dvb_frontend *fe = tuner_dev->fe; + + memset(&fe->ops.tuner_ops, 0, sizeof(struct dvb_tuner_ops)); + fe->tuner_priv = NULL; + kfree(tuner_dev); + + return 0; +} + +static struct i2c_driver vidtv_tuner_i2c_driver = { + .driver = { + .name = "vidtv_tuner", + .suppress_bind_attrs = true, + }, + .probe = vidtv_tuner_i2c_probe, + .remove = vidtv_tuner_i2c_remove, + .id_table = vidtv_tuner_i2c_id_table, +}; +module_i2c_driver(vidtv_tuner_i2c_driver); From patchwork Sat May 2 03:22:08 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Almeida X-Patchwork-Id: 63506 Received: from vger.kernel.org ([23.128.96.18]) by www.linuxtv.org with esmtp (Exim 4.92) (envelope-from ) id 1jUiga-007NUh-94; 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Fri, 01 May 2020 20:22:39 -0700 (PDT) From: "Daniel W. S. Almeida" X-Google-Original-From: Daniel W. S. Almeida To: mchehab+huawei@kernel.org, sean@mess.org, kstewart@linuxfoundation.org, allison@lohutok.net, tglx@linutronix.de Cc: "Daniel W. S. Almeida" , linux-media@vger.kernel.org, skhan@linuxfoundation.org, linux-kernel-mentees@lists.linuxfoundation.org, linux-kernel@vger.kernel.org Subject: [RFC, WIP, v4 03/11] media: vidtv: implement a demodulator driver Date: Sat, 2 May 2020 00:22:08 -0300 Message-Id: <20200502032216.197977-4-dwlsalmeida@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200502032216.197977-1-dwlsalmeida@gmail.com> References: <20200502032216.197977-1-dwlsalmeida@gmail.com> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-LSpam-Score: -2.5 (--) X-LSpam-Report: No, score=-2.5 required=5.0 tests=BAYES_00=-1.9,DKIM_SIGNED=0.1,DKIM_VALID=-0.1,DKIM_VALID_AU=-0.1,FREEMAIL_FORGED_FROMDOMAIN=0.001,FREEMAIL_FROM=0.001,HEADER_FROM_DIFFERENT_DOMAINS=0.5,MAILING_LIST_MULTI=-1 autolearn=ham autolearn_force=no From: "Daniel W. S. Almeida" Implement a I2C demodulator driver, simulating support for DVB-T, DVB-C and DVB-S. This demodulator will periodically check the signal quality against a table and drop the TS lock if it drops below a threshold value, regaining it in the event that the signal improves. Signed-off-by: Daniel W. S. Almeida --- drivers/media/test-drivers/vidtv/Makefile | 2 +- .../media/test-drivers/vidtv/vidtv_demod.c | 493 ++++++++++++++++++ .../media/test-drivers/vidtv/vidtv_demod.h | 43 ++ 3 files changed, 537 insertions(+), 1 deletion(-) create mode 100644 drivers/media/test-drivers/vidtv/vidtv_demod.c create mode 100644 drivers/media/test-drivers/vidtv/vidtv_demod.h diff --git a/drivers/media/test-drivers/vidtv/Makefile b/drivers/media/test-drivers/vidtv/Makefile index e625810a82603..36ba00ddc0d1e 100644 --- a/drivers/media/test-drivers/vidtv/Makefile +++ b/drivers/media/test-drivers/vidtv/Makefile @@ -1,3 +1,3 @@ # SPDX-License-Identifier: GPL-2.0 -obj-$(CONFIG_DVB_VIDTV) += vidtv_tuner.o +obj-$(CONFIG_DVB_VIDTV) += vidtv_tuner.o vidtv_demod.o diff --git a/drivers/media/test-drivers/vidtv/vidtv_demod.c b/drivers/media/test-drivers/vidtv/vidtv_demod.c new file mode 100644 index 0000000000000..e5f157e4bbe48 --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_demod.c @@ -0,0 +1,493 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * The Virtual DVB test driver serves as a reference DVB driver and helps + * validate the existing APIs in the media subsystem. It can also aid + * developers working on userspace applications. + * + * Written by Daniel W. S. Almeida + * Based on the example driver written by Emard + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "vidtv_demod.h" + +MODULE_DESCRIPTION("Virtual DVB Demodulator Driver"); +MODULE_AUTHOR("Daniel W. S. Almeida"); +MODULE_LICENSE("GPL"); + +struct vidtv_demod_cnr_to_qual_s vidtv_demod_c_cnr_2_qual[] = { + /* from libdvbv5 source code, in milli db */ + { QAM_256, FEC_NONE, 34000, 38000}, + { QAM_64, FEC_NONE, 30000, 34000}, +}; + +struct vidtv_demod_cnr_to_qual_s vidtv_demod_s_cnr_2_qual[] = { + /* from libdvbv5 source code, in milli db */ + { QPSK, FEC_1_2, 7000, 10000}, + { QPSK, FEC_2_3, 9000, 12000}, + { QPSK, FEC_3_4, 10000, 13000}, + { QPSK, FEC_5_6, 11000, 14000}, + { QPSK, FEC_7_8, 12000, 15000}, +}; + +struct vidtv_demod_cnr_to_qual_s vidtv_demod_s2_cnr_2_qual[] = { + /* from libdvbv5 source code, in milli db */ + { QPSK, FEC_1_2, 9000, 12000}, + { QPSK, FEC_2_3, 11000, 14000}, + { QPSK, FEC_3_4, 12000, 15000}, + { QPSK, FEC_5_6, 12000, 15000}, + { QPSK, FEC_8_9, 13000, 16000}, + { QPSK, FEC_9_10, 13500, 16500}, + { PSK_8, FEC_2_3, 14500, 17500}, + { PSK_8, FEC_3_4, 16000, 19000}, + { PSK_8, FEC_5_6, 17500, 20500}, + { PSK_8, FEC_8_9, 19000, 22000}, +}; + +static struct vidtv_demod_cnr_to_qual_s vidtv_demod_t_cnr_2_qual[] = { + /* from libdvbv5 source code, in milli db*/ + { QPSK, FEC_1_2, 4100, 5900}, + { QPSK, FEC_2_3, 6100, 9600}, + { QPSK, FEC_3_4, 7200, 12400}, + { QPSK, FEC_5_6, 8500, 15600}, + { QPSK, FEC_7_8, 9200, 17500}, + + { QAM_16, FEC_1_2, 9800, 11800}, + { QAM_16, FEC_2_3, 12100, 15300}, + { QAM_16, FEC_3_4, 13400, 18100}, + { QAM_16, FEC_5_6, 14800, 21300}, + { QAM_16, FEC_7_8, 15700, 23600}, + + { QAM_64, FEC_1_2, 14000, 16000}, + { QAM_64, FEC_2_3, 19900, 25400}, + { QAM_64, FEC_3_4, 24900, 27900}, + { QAM_64, FEC_5_6, 21300, 23300}, + { QAM_64, FEC_7_8, 22000, 24000}, +}; + +static struct vidtv_demod_cnr_to_qual_s +*vidtv_match_cnr_s(struct dvb_frontend *fe) +{ + struct dtv_frontend_properties *c; + struct vidtv_demod_cnr_to_qual_s *cnr2qual = NULL; + u32 array_size = 0; + u32 i; + + c = &fe->dtv_property_cache; + + switch (c->delivery_system) { + case SYS_DVBT: + case SYS_DVBT2: + cnr2qual = vidtv_demod_t_cnr_2_qual; + array_size = ARRAY_SIZE(vidtv_demod_t_cnr_2_qual); + break; + + case SYS_DVBS: + cnr2qual = vidtv_demod_s_cnr_2_qual; + array_size = ARRAY_SIZE(vidtv_demod_s_cnr_2_qual); + break; + + case SYS_DVBS2: + cnr2qual = vidtv_demod_s2_cnr_2_qual; + array_size = ARRAY_SIZE(vidtv_demod_s2_cnr_2_qual); + break; + + case SYS_DVBC_ANNEX_A: + cnr2qual = vidtv_demod_c_cnr_2_qual; + array_size = ARRAY_SIZE(vidtv_demod_c_cnr_2_qual); + break; + + default: + pr_warn("%s: unsupported delivery system: %u\n", + __func__, + c->delivery_system); + break; + } + + for (i = 0; i <= array_size; i++) + if (cnr2qual[i].modulation == c->modulation && + cnr2qual[i].fec == c->fec_inner) + return &cnr2qual[i]; + + return NULL; /* not found */ +} + +static void vidtv_demod_poll_snr_handler(struct work_struct *work) +{ + /* + * periodically check the signal quality and eventually + * lose the TS lock if it dips too low + */ + struct vidtv_demod_state *state; + struct dtv_frontend_properties *c; + struct vidtv_demod_cnr_to_qual_s *cnr2qual = NULL; + struct vidtv_demod_config *config; + u16 snr = 0; + + state = container_of(work, struct vidtv_demod_state, poll_snr.work); + c = &state->frontend.dtv_property_cache; + config = &state->config; + + if (!state->frontend.ops.tuner_ops.get_rf_strength) + return; + + state->frontend.ops.tuner_ops.get_rf_strength(&state->frontend, &snr); + + cnr2qual = vidtv_match_cnr_s(&state->frontend); + if (!cnr2qual) + return; + + if (snr < cnr2qual->cnr_ok) { + /* eventually lose the TS lock */ + if (prandom_u32_max(100) < config->drop_tslock_prob_on_low_snr) + state->status = 0; + } else { + /* recover if the signal improves */ + if (prandom_u32_max(100) < + config->recover_tslock_prob_on_good_snr) + state->status = FE_HAS_SIGNAL | + FE_HAS_CARRIER | + FE_HAS_VITERBI | + FE_HAS_SYNC | + FE_HAS_LOCK; + } + + schedule_delayed_work(&state->poll_snr, msecs_to_jiffies(2000)); +} + +static int vidtv_demod_read_status(struct dvb_frontend *fe, + enum fe_status *status) +{ + struct vidtv_demod_state *state = fe->demodulator_priv; + + *status = state->status; + + return 0; +} + +static int vidtv_demod_read_ber(struct dvb_frontend *fe, u32 *ber) +{ + *ber = 0; + return 0; +} + +static int vidtv_demod_read_signal_strength(struct dvb_frontend *fe, + u16 *strength) +{ + *strength = 0; + return 0; +} + +static int vidtv_demod_read_snr(struct dvb_frontend *fe, u16 *snr) +{ + *snr = 0; + return 0; +} + +static int vidtv_demod_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks) +{ + *ucblocks = 0; + return 0; +} + +/* + * Should only be implemented if it actually reads something from the hardware. + * Also, it should check for the locks, in order to avoid report wrong data + * to userspace. + */ +static int vidtv_demod_get_frontend(struct dvb_frontend *fe, + struct dtv_frontend_properties *p) +{ + return 0; +} + +static int vidtv_demod_set_frontend(struct dvb_frontend *fe) +{ + struct vidtv_demod_state *state = fe->demodulator_priv; + struct vidtv_demod_cnr_to_qual_s *cnr2qual = NULL; + u32 tuner_status = 0; + + if (fe->ops.tuner_ops.set_params) { + fe->ops.tuner_ops.set_params(fe); + + /* store the CNR returned by the tuner */ + fe->ops.tuner_ops.get_rf_strength(fe, &state->tuner_cnr); + + fe->ops.tuner_ops.get_status(fe, &tuner_status); + state->status = (state->tuner_cnr > 0) ? FE_HAS_SIGNAL | + FE_HAS_CARRIER | + FE_HAS_VITERBI | + FE_HAS_SYNC | + FE_HAS_LOCK : + 0; + cnr2qual = vidtv_match_cnr_s(fe); + + /* signal isn't good: might lose the lock eventually */ + if (tuner_status == TUNER_STATUS_LOCKED && + state->tuner_cnr < cnr2qual->cnr_good) { + schedule_delayed_work(&state->poll_snr, + msecs_to_jiffies(2000)); + + state->poll_snr_thread_running = true; + } + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 0); + } + + return 0; +} + +static int vidtv_demod_sleep(struct dvb_frontend *fe) +{ + struct vidtv_demod_state *state = fe->demodulator_priv; + + if (state->poll_snr_thread_running) { + cancel_delayed_work_sync(&state->poll_snr); + state->poll_snr_thread_running = false; + state->poll_snr_thread_restart = true; + } + return 0; +} + +static int vidtv_demod_init(struct dvb_frontend *fe) +{ + struct vidtv_demod_state *state = fe->demodulator_priv; + u32 tuner_status = 0; + + if (state->cold_start) + INIT_DELAYED_WORK(&state->poll_snr, + &vidtv_demod_poll_snr_handler); + + /* + * At resume, start the snr poll thread only if it was suspended with + * the thread running. Extra care should be taken here, as some tuner + * status change might happen at resume time (for example, due to a + * ioctl syscall to set_frontend, or due to a release syscall). + */ + fe->ops.tuner_ops.get_status(fe, &tuner_status); + + if (tuner_status == TUNER_STATUS_LOCKED && + state->poll_snr_thread_restart) { + schedule_delayed_work(&state->poll_snr, + msecs_to_jiffies(2000)); + + state->poll_snr_thread_restart = false; + } + + state->cold_start = false; + return 0; +} + +static int vidtv_demod_set_tone(struct dvb_frontend *fe, + enum fe_sec_tone_mode tone) +{ + return 0; +} + +static int vidtv_demod_set_voltage(struct dvb_frontend *fe, + enum fe_sec_voltage voltage) +{ + return 0; +} + +static void vidtv_demod_release(struct dvb_frontend *fe) +{ + struct vidtv_demod_state *state = fe->demodulator_priv; + + if (state->poll_snr_thread_running) + cancel_delayed_work_sync(&state->poll_snr); + + kfree(state); +} + +static const struct dvb_frontend_ops vidtv_demod_ofdm_ops = { + .delsys = { SYS_DVBT }, + .info = { + .name = "Dummy DVB-T", + .frequency_min_hz = 0, + .frequency_max_hz = 863250 * kHz, + .frequency_stepsize_hz = 62500, + .caps = FE_CAN_FEC_1_2 | + FE_CAN_FEC_2_3 | + FE_CAN_FEC_3_4 | + FE_CAN_FEC_4_5 | + FE_CAN_FEC_5_6 | + FE_CAN_FEC_6_7 | + FE_CAN_FEC_7_8 | + FE_CAN_FEC_8_9 | + FE_CAN_FEC_AUTO | + FE_CAN_QAM_16 | + FE_CAN_QAM_64 | + FE_CAN_QAM_AUTO | + FE_CAN_TRANSMISSION_MODE_AUTO | + FE_CAN_GUARD_INTERVAL_AUTO | + FE_CAN_HIERARCHY_AUTO, + }, + + .release = vidtv_demod_release, + + .init = vidtv_demod_init, + .sleep = vidtv_demod_sleep, + + .set_frontend = vidtv_demod_set_frontend, + .get_frontend = vidtv_demod_get_frontend, + + .read_status = vidtv_demod_read_status, + .read_ber = vidtv_demod_read_ber, + .read_signal_strength = vidtv_demod_read_signal_strength, + .read_snr = vidtv_demod_read_snr, + .read_ucblocks = vidtv_demod_read_ucblocks, +}; + +static const struct dvb_frontend_ops vidtv_demod_qam_ops = { + .delsys = { SYS_DVBC_ANNEX_A }, + .info = { + .name = "Dummy DVB-C", + .frequency_min_hz = 51 * MHz, + .frequency_max_hz = 858 * MHz, + .frequency_stepsize_hz = 62500, + /* symbol_rate_min: SACLK/64 == (XIN/2)/64 */ + .symbol_rate_min = (57840000 / 2) / 64, + .symbol_rate_max = (57840000 / 2) / 4, /* SACLK/4 */ + .caps = FE_CAN_QAM_16 | + FE_CAN_QAM_32 | + FE_CAN_QAM_64 | + FE_CAN_QAM_128 | + FE_CAN_QAM_256 | + FE_CAN_FEC_AUTO | + FE_CAN_INVERSION_AUTO + }, + + .release = vidtv_demod_release, + + .init = vidtv_demod_init, + .sleep = vidtv_demod_sleep, + + .set_frontend = vidtv_demod_set_frontend, + .get_frontend = vidtv_demod_get_frontend, + + .read_status = vidtv_demod_read_status, + .read_ber = vidtv_demod_read_ber, + .read_signal_strength = vidtv_demod_read_signal_strength, + .read_snr = vidtv_demod_read_snr, + .read_ucblocks = vidtv_demod_read_ucblocks, +}; + +static const struct dvb_frontend_ops vidtv_demod_qpsk_ops = { + .delsys = { SYS_DVBS }, + .info = { + .name = "Dummy DVB-S", + .frequency_min_hz = 950 * MHz, + .frequency_max_hz = 2150 * MHz, + .frequency_stepsize_hz = 250 * kHz, + .frequency_tolerance_hz = 29500 * kHz, + .symbol_rate_min = 1000000, + .symbol_rate_max = 45000000, + .caps = FE_CAN_INVERSION_AUTO | + FE_CAN_FEC_1_2 | + FE_CAN_FEC_2_3 | + FE_CAN_FEC_3_4 | + FE_CAN_FEC_5_6 | + FE_CAN_FEC_7_8 | + FE_CAN_FEC_AUTO | + FE_CAN_QPSK + }, + + .release = vidtv_demod_release, + + .init = vidtv_demod_init, + .sleep = vidtv_demod_sleep, + + .set_frontend = vidtv_demod_set_frontend, + .get_frontend = vidtv_demod_get_frontend, + + .read_status = vidtv_demod_read_status, + .read_ber = vidtv_demod_read_ber, + .read_signal_strength = vidtv_demod_read_signal_strength, + .read_snr = vidtv_demod_read_snr, + .read_ucblocks = vidtv_demod_read_ucblocks, + + .set_voltage = vidtv_demod_set_voltage, + .set_tone = vidtv_demod_set_tone, +}; + +static const struct i2c_device_id vidtv_demod_i2c_id_table[] = { + {"vidtv_demod", 0}, + {} +}; +MODULE_DEVICE_TABLE(i2c, vidtv_demod_i2c_id_table); + +static int vidtv_demod_i2c_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct vidtv_demod_config *config = client->dev.platform_data; + struct vidtv_demod_state *state; + const struct dvb_frontend_ops *ops; + + /* allocate memory for the internal state */ + state = kzalloc(sizeof(*state), GFP_KERNEL); + if (!state) + return -ENOMEM; + + switch (config->chosen_delsys) { + case SYS_DVBT: + ops = &vidtv_demod_ofdm_ops; + break; + case SYS_DVBC_ANNEX_A: + ops = &vidtv_demod_qam_ops; + break; + case SYS_DVBS: + ops = &vidtv_demod_qpsk_ops; + break; + default: + pr_err("%s: Unsupported delivery system. Falling back to DVB-T", + __func__); + ops = &vidtv_demod_ofdm_ops; + break; + } + + /* create dvb_frontend */ + memcpy(&state->frontend.ops, + ops, + sizeof(struct dvb_frontend_ops)); + + state->frontend.demodulator_priv = state; + /* return the pointer to the bridge driver */ + config->frontend = &state->frontend; + i2c_set_clientdata(client, state); + + return 0; +} + +static int vidtv_demod_i2c_remove(struct i2c_client *client) +{ + struct vidtv_demod_state *state = i2c_get_clientdata(client); + + memset(&state->frontend.ops, 0, sizeof(struct dvb_frontend_ops)); + state->frontend.demodulator_priv = NULL; + kfree(state); + + return 0; +} + +static struct i2c_driver vidtv_demod_i2c_driver = { + .driver = { + .name = "vidtv_demod", + .suppress_bind_attrs = true, + }, + .probe = vidtv_demod_i2c_probe, + .remove = vidtv_demod_i2c_remove, + .id_table = vidtv_demod_i2c_id_table, +}; + +module_i2c_driver(vidtv_demod_i2c_driver); diff --git a/drivers/media/test-drivers/vidtv/vidtv_demod.h b/drivers/media/test-drivers/vidtv/vidtv_demod.h new file mode 100644 index 0000000000000..49c2a43f71661 --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_demod.h @@ -0,0 +1,43 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * The Virtual DTV test driver serves as a reference DVB driver and helps + * validate the existing APIs in the media subsystem. It can also aid + * developers working on userspace applications. + * + * Written by Daniel W. S. Almeida + * Based on the example driver written by Emard + */ + +#ifndef VIDTV_DEMOD_H +#define VIDTV_DEMOD_H + +#include +#include + +struct vidtv_demod_cnr_to_qual_s { + /* attempt to use the same values as libdvbv5 */ + u32 modulation; + u32 fec; + u32 cnr_ok, cnr_good; +}; + +struct vidtv_demod_config { + struct dvb_frontend *frontend; + /* probability of losing the lock due to low snr */ + u8 drop_tslock_prob_on_low_snr; + /* probability of recovering when the signal improves */ + u8 recover_tslock_prob_on_good_snr; + u8 chosen_delsys; +}; + +struct vidtv_demod_state { + struct dvb_frontend frontend; + struct vidtv_demod_config config; + struct delayed_work poll_snr; + enum fe_status status; + u16 tuner_cnr; + bool cold_start; + bool poll_snr_thread_running; + bool poll_snr_thread_restart; +}; +#endif // VIDTV_DEMOD_H From patchwork Sat May 2 03:22:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Almeida X-Patchwork-Id: 63508 Received: from vger.kernel.org ([23.128.96.18]) by www.linuxtv.org with esmtp (Exim 4.92) (envelope-from ) id 1jUign-007NVn-4T; Sat, 02 May 2020 03:19:41 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727815AbgEBDWr (ORCPT + 1 other); Fri, 1 May 2020 23:22:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39916 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726439AbgEBDWq (ORCPT ); Fri, 1 May 2020 23:22:46 -0400 Received: from mail-qt1-x844.google.com (mail-qt1-x844.google.com [IPv6:2607:f8b0:4864:20::844]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 14B17C061A0C; Fri, 1 May 2020 20:22:44 -0700 (PDT) Received: by mail-qt1-x844.google.com with SMTP id g26so5683015qtv.13; Fri, 01 May 2020 20:22:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=M9aiXFxkkHzWycdBKzVgypNSiFv5YUSEcCj5fU/dHuw=; b=JmE/5ZgiMPx9+UBCjBmgrwStyLpG/LE6GYrB4oYYDLTaD/Jz2PePLbEm7ECxNKqs1N 0q8B4o8aH/+z4dAyLO+vzwtxoPsgk+8zwJCVDZM66ffREpzgI+kI7dSuqlJMONz+XsZd hO7RhWnWmcvSkDVG5w4KhLPFKIFsGrz0Vpf5gEg1eJjXuv5Agn8Nx1qj4JJ6cTnykENp N6BFgL4oM8ySj+C8/2w8m8QnEd6McSP3qlY25+YeKEZNrbT+Cpzpk7fnu1PnRgG46Qpe of9te20HNiuTlKNRwxX4aD9RccAKqCuU4S6E95pOnrkknlwd5Hg1Ifmc79lXO26O72BC MI+g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=M9aiXFxkkHzWycdBKzVgypNSiFv5YUSEcCj5fU/dHuw=; b=PihALswj6GxklcvTyZfF3D6W9aHDVplIZWf3M9AhGhzI4A+iTTBKrp39dpCFUmVJzx TPsbkh4Xxf1+CueeOCVBL0l/+Iu9aQ8/iFFcRAHNMPVzoyq+ykp3tTt4eOfbTZregYi2 p2rsY5orRL5tE+2RtQBRDLchxG/WQnXmEBq6hMGO1iZg+e4CiMhAzB1RX4xkNA1Ikjmi A7F6eakjeuulnpUexP8kAspPjaaGUTUTTivrEfK9MelV8iYxE1m0qXb2yr/UU5u7VdNf +pmotsiIS1XM0r2hT4BGKV3v2MJql0C+g8eFq2e1BmgMxi5Alur+8BKw9uz6WeMZSvKZ Vo9w== X-Gm-Message-State: AGi0PuZEu9jwZLiiIJMTrrrhScvaqc3oTb3oZ1Nl9XM4ytXGuIt/zMcB xAXg3oJaUubmpFEC+WDn0vY= X-Google-Smtp-Source: APiQypIiceR1T8wkFb1LYT7VxbFeuyiaZkDwvF0YepOqRKrdB8mltj7qJA8UdOMUzUh6zDl2s7bqYw== X-Received: by 2002:aed:3e27:: with SMTP id l36mr6945915qtf.192.1588389764042; Fri, 01 May 2020 20:22:44 -0700 (PDT) Received: from localhost.localdomain ([2804:18:602b:723a:1b2a:57a1:a611:34ed]) by smtp.gmail.com with ESMTPSA id c41sm4410399qta.96.2020.05.01.20.22.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 May 2020 20:22:43 -0700 (PDT) From: "Daniel W. S. Almeida" X-Google-Original-From: Daniel W. S. Almeida To: mchehab+huawei@kernel.org, sean@mess.org, kstewart@linuxfoundation.org, allison@lohutok.net, tglx@linutronix.de Cc: "Daniel W. S. Almeida" , linux-media@vger.kernel.org, skhan@linuxfoundation.org, linux-kernel-mentees@lists.linuxfoundation.org, linux-kernel@vger.kernel.org Subject: [RFC, WIP, v4 04/11] media: vidtv: move config structs into a separate header Date: Sat, 2 May 2020 00:22:09 -0300 Message-Id: <20200502032216.197977-5-dwlsalmeida@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200502032216.197977-1-dwlsalmeida@gmail.com> References: <20200502032216.197977-1-dwlsalmeida@gmail.com> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-LSpam-Score: -2.5 (--) X-LSpam-Report: No, score=-2.5 required=5.0 tests=BAYES_00=-1.9,DKIM_SIGNED=0.1,DKIM_VALID=-0.1,DKIM_VALID_AU=-0.1,FREEMAIL_FORGED_FROMDOMAIN=0.001,FREEMAIL_FROM=0.001,HEADER_FROM_DIFFERENT_DOMAINS=0.5,MAILING_LIST_MULTI=-1 autolearn=ham autolearn_force=no From: "Daniel W. S. Almeida" Move config structs to a common header so they can be used by the bridge driver and by their respective drivers. Signed-off-by: Daniel W. S. Almeida --- .../media/test-drivers/vidtv/vidtv_config.h | 35 +++++++++++++++++++ .../media/test-drivers/vidtv/vidtv_demod.c | 1 + .../media/test-drivers/vidtv/vidtv_demod.h | 9 ----- .../media/test-drivers/vidtv/vidtv_tuner.c | 12 ++----- 4 files changed, 38 insertions(+), 19 deletions(-) create mode 100644 drivers/media/test-drivers/vidtv/vidtv_config.h diff --git a/drivers/media/test-drivers/vidtv/vidtv_config.h b/drivers/media/test-drivers/vidtv/vidtv_config.h new file mode 100644 index 0000000000000..7b95bf2444556 --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_config.h @@ -0,0 +1,35 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * The Virtual DTV test driver serves as a reference DVB driver and helps + * validate the existing APIs in the media subsystem. It can also aid + * developers working on userspace applications. + * + * Written by Daniel W. S. Almeida + */ + +#ifndef VIDTV_CONFIG_H +#define VIDTV_CONFIG_H + +#include +#include + +struct vidtv_tuner_config { + struct dvb_frontend *fe; + u32 mock_power_up_delay_msec; + u32 mock_tune_delay_msec; + u32 vidtv_valid_dvb_t_freqs[8]; + u32 vidtv_valid_dvb_c_freqs[8]; + u32 vidtv_valid_dvb_s_freqs[8]; + u8 max_frequency_shift_hz; +}; + +struct vidtv_demod_config { + struct dvb_frontend *frontend; + /* probability of losing the lock due to low snr */ + u8 drop_tslock_prob_on_low_snr; + /* probability of recovering when the signal improves */ + u8 recover_tslock_prob_on_good_snr; + u8 chosen_delsys; +}; + +#endif //VIDTV_CONFIG_H diff --git a/drivers/media/test-drivers/vidtv/vidtv_demod.c b/drivers/media/test-drivers/vidtv/vidtv_demod.c index e5f157e4bbe48..15436e565a7b0 100644 --- a/drivers/media/test-drivers/vidtv/vidtv_demod.c +++ b/drivers/media/test-drivers/vidtv/vidtv_demod.c @@ -19,6 +19,7 @@ #include #include #include "vidtv_demod.h" +#include "vidtv_config.h" MODULE_DESCRIPTION("Virtual DVB Demodulator Driver"); MODULE_AUTHOR("Daniel W. S. Almeida"); diff --git a/drivers/media/test-drivers/vidtv/vidtv_demod.h b/drivers/media/test-drivers/vidtv/vidtv_demod.h index 49c2a43f71661..269855efb77f3 100644 --- a/drivers/media/test-drivers/vidtv/vidtv_demod.h +++ b/drivers/media/test-drivers/vidtv/vidtv_demod.h @@ -21,15 +21,6 @@ struct vidtv_demod_cnr_to_qual_s { u32 cnr_ok, cnr_good; }; -struct vidtv_demod_config { - struct dvb_frontend *frontend; - /* probability of losing the lock due to low snr */ - u8 drop_tslock_prob_on_low_snr; - /* probability of recovering when the signal improves */ - u8 recover_tslock_prob_on_good_snr; - u8 chosen_delsys; -}; - struct vidtv_demod_state { struct dvb_frontend frontend; struct vidtv_demod_config config; diff --git a/drivers/media/test-drivers/vidtv/vidtv_tuner.c b/drivers/media/test-drivers/vidtv/vidtv_tuner.c index a790508f935b3..ece4a94b0c3ac 100644 --- a/drivers/media/test-drivers/vidtv/vidtv_tuner.c +++ b/drivers/media/test-drivers/vidtv/vidtv_tuner.c @@ -17,20 +17,12 @@ #include #include +#include "vidtv_config.h" + MODULE_DESCRIPTION("Virtual DTV Tuner"); MODULE_AUTHOR("Daniel W. S. Almeida"); MODULE_LICENSE("GPL"); -struct vidtv_tuner_config { - struct dvb_frontend *fe; - u32 mock_power_up_delay_msec; - u32 mock_tune_delay_msec; - u32 vidtv_valid_dvb_t_freqs[8]; - u32 vidtv_valid_dvb_c_freqs[8]; - u32 vidtv_valid_dvb_s_freqs[8]; - u8 max_frequency_shift_hz; -}; - struct vidtv_tuner_cnr_to_qual_s { /* attempt to use the same values as libdvbv5 */ u32 modulation; From patchwork Sat May 2 03:22:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Almeida X-Patchwork-Id: 63507 Received: from vger.kernel.org ([23.128.96.18]) by www.linuxtv.org with esmtp (Exim 4.92) (envelope-from ) id 1jUigl-007NVn-5I; Sat, 02 May 2020 03:19:40 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727850AbgEBDWu (ORCPT + 1 other); Fri, 1 May 2020 23:22:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39928 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726439AbgEBDWt (ORCPT ); Fri, 1 May 2020 23:22:49 -0400 Received: from mail-qk1-x744.google.com (mail-qk1-x744.google.com [IPv6:2607:f8b0:4864:20::744]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5AAFEC061A0C; Fri, 1 May 2020 20:22:49 -0700 (PDT) Received: by mail-qk1-x744.google.com with SMTP id t3so11242799qkg.1; Fri, 01 May 2020 20:22:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ypDA5jJe/YEdzp8yPczC7cUQkpm/2QHAT8cMv9NRwek=; b=h+ZkInoMZb/Dz7B2oshu55sqjepgTxrPfQ7+eKXAnysKvJ4A/CA9hqAMnduT/2NQFN JeRijdC3+bKvX8zTNWrcC0ujKCkAluELMlL1DhgQDDcv413FyBJUrVzZ2zLau07YfHGi l70PITUYkbZHEjt1EcG1YjU4t7f5aeeWIrT8jPo9J9BU0cdv4u/w2HN9VPIPE57xCIYT ATHIEKN5odbxCPV8DJbobz4icD3JO9sVjgUKD3OYDaxwenopqJkVAXuOE5Vbn5yJ/K96 Dq9sOdVMx5UCAdjc9lgJEDPwRetNcOq79QvlsReQb6asi3vkmbjTUvFplGYDTIZd1mY9 Xulw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ypDA5jJe/YEdzp8yPczC7cUQkpm/2QHAT8cMv9NRwek=; b=rfwni56Imj6rLm3j5ZNhszrCwjw4VBSa/oUoGWRBTNWIr14skSeJQ/RPDT1crdUFnx rspK2Sa04syv9p442mIuUFb9Rt7XaWBI3S3UHtMCEkj8SWpWD948JQQ4N4XWYiKkve47 CPcstuiGRUz3C25757sBklQRVMnYWmDTogSsrZ49NTRPOVNWmciMfeIrYwTtubxBjTCF Z7juEowvUf9CIanF9qg2TG3k53+4Gnf/lI6biCwnG+qt673HQd61GRDXLOjVK7G0ZpjU GV4FfUpVFfCc4BskmOxsqXwyWvASkRlSqypx96foongxcaOgcDzJbTMzJzo3hkys39Tx jT2Q== X-Gm-Message-State: AGi0PuY12Qsmhs4qKLo9ewt4dRKAunCDDVkY7WcnccZfVSzKGmQH56jq MGweBDqyO1qHrwl/pjSQVzM= X-Google-Smtp-Source: APiQypKKN73QGAfVOXXyTEk06NSYy09tkedCo7hcehXo1r86lbyX+nWPYjnwZKrh9o3w0IpenQV1VA== X-Received: by 2002:a37:6cc7:: with SMTP id h190mr6591036qkc.115.1588389768441; Fri, 01 May 2020 20:22:48 -0700 (PDT) Received: from localhost.localdomain ([2804:18:602b:723a:1b2a:57a1:a611:34ed]) by smtp.gmail.com with ESMTPSA id c41sm4410399qta.96.2020.05.01.20.22.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 May 2020 20:22:47 -0700 (PDT) From: "Daniel W. S. Almeida" X-Google-Original-From: Daniel W. S. Almeida To: mchehab+huawei@kernel.org, sean@mess.org, kstewart@linuxfoundation.org, allison@lohutok.net, tglx@linutronix.de Cc: "Daniel W. S. Almeida" , linux-media@vger.kernel.org, skhan@linuxfoundation.org, linux-kernel-mentees@lists.linuxfoundation.org, linux-kernel@vger.kernel.org Subject: [RFC, WIP, v4 05/11] media: vidtv: add a bridge driver Date: Sat, 2 May 2020 00:22:10 -0300 Message-Id: <20200502032216.197977-6-dwlsalmeida@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200502032216.197977-1-dwlsalmeida@gmail.com> References: <20200502032216.197977-1-dwlsalmeida@gmail.com> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-LSpam-Score: -2.5 (--) X-LSpam-Report: No, score=-2.5 required=5.0 tests=BAYES_00=-1.9,DKIM_SIGNED=0.1,DKIM_VALID=-0.1,DKIM_VALID_AU=-0.1,FREEMAIL_FORGED_FROMDOMAIN=0.001,FREEMAIL_FROM=0.001,HEADER_FROM_DIFFERENT_DOMAINS=0.5,MAILING_LIST_MULTI=-1 autolearn=ham autolearn_force=no From: "Daniel W. S. Almeida" Digital TV devices consist of several independent hardware components which are controlled by different drivers. Each media device is controlled by a group of cooperating drivers with the bridge driver as the main driver. This patch adds a bridge driver for the Virtual Digital TV driver [vidtv]. The bridge driver binds to the other drivers, that is, vidtv_tuner and vidtv_demod and implements the digital demux logic, providing userspace with a MPEG Transport Stream. Move config structs to a common header so they can be used by the bridge driver and by their respective drivers. Signed-off-by: Daniel W. S. Almeida --- drivers/media/test-drivers/vidtv/Makefile | 2 +- .../media/test-drivers/vidtv/vidtv_bridge.c | 379 ++++++++++++++++++ .../media/test-drivers/vidtv/vidtv_bridge.h | 37 ++ 3 files changed, 417 insertions(+), 1 deletion(-) create mode 100644 drivers/media/test-drivers/vidtv/vidtv_bridge.c create mode 100644 drivers/media/test-drivers/vidtv/vidtv_bridge.h diff --git a/drivers/media/test-drivers/vidtv/Makefile b/drivers/media/test-drivers/vidtv/Makefile index 36ba00ddc0d1e..a9f1993dd5443 100644 --- a/drivers/media/test-drivers/vidtv/Makefile +++ b/drivers/media/test-drivers/vidtv/Makefile @@ -1,3 +1,3 @@ # SPDX-License-Identifier: GPL-2.0 -obj-$(CONFIG_DVB_VIDTV) += vidtv_tuner.o vidtv_demod.o +obj-$(CONFIG_DVB_VIDTV) += vidtv_tuner.o vidtv_demod.o vidtv_bridge.o diff --git a/drivers/media/test-drivers/vidtv/vidtv_bridge.c b/drivers/media/test-drivers/vidtv/vidtv_bridge.c new file mode 100644 index 0000000000000..05ca4027c869f --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_bridge.c @@ -0,0 +1,379 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * The Virtual DTV test driver serves as a reference DVB driver and helps + * validate the existing APIs in the media subsystem. It can also aid + * developers working on userspace applications. + * + * Written by Daniel W. S. Almeida + */ + +#include +#include +#include +#include +#include +#include "vidtv_bridge.h" + +#define TS_BUF_MAX_SZ (128 * 188) +#define TUNER_DEFAULT_ADDR 0x68 +#define DEMOD_DEFAULT_ADDR 0x60 + +MODULE_AUTHOR("Daniel W. S. Almeida"); +MODULE_LICENSE("GPL"); + +static unsigned int drop_tslock_prob_on_low_snr; +module_param(drop_tslock_prob_on_low_snr, uint, 0644); +MODULE_PARM_DESC(drop_tslock_prob_on_low_snr, + "Probability of losing the TS lock if the signal quality is bad"); + +static unsigned int recover_tslock_prob_on_good_snr; +module_param(recover_tslock_prob_on_good_snr, uint, 0644); +MODULE_PARM_DESC(recover_tslock_prob_on_good_snr, + "Probability recovering the TS lock when the signal improves"); + +static unsigned int mock_power_up_delay_msec; +module_param(mock_power_up_delay_msec, uint, 0644); +MODULE_PARM_DESC(mock_power_up_delay_msec, "Simulate a power up delay"); + +static unsigned int mock_tune_delay_msec; +module_param(mock_tune_delay_msec, uint, 0644); +MODULE_PARM_DESC(mock_tune_delay_msec, "Simulate a tune delay"); + +static unsigned int vidtv_valid_dvb_t_freqs[8]; +module_param_array(vidtv_valid_dvb_t_freqs, uint, NULL, 0644); +MODULE_PARM_DESC(vidtv_valid_dvb_t_freqs, + "Valid DVB-T frequencies to simulate"); + +static unsigned int vidtv_valid_dvb_c_freqs[8]; +module_param_array(vidtv_valid_dvb_c_freqs, uint, NULL, 0644); +MODULE_PARM_DESC(vidtv_valid_dvb_c_freqs, + "Valid DVB-C frequencies to simulate"); + +static unsigned int vidtv_valid_dvb_s_freqs[8]; +module_param_array(vidtv_valid_dvb_s_freqs, uint, NULL, 0644); +MODULE_PARM_DESC(vidtv_valid_dvb_s_freqs, + "Valid DVB-C frequencies to simulate"); + +static unsigned int max_frequency_shift_hz; +module_param(max_frequency_shift_hz, uint, 0644); +MODULE_PARM_DESC(max_frequency_shift_hz, + "Maximum shift in HZ allowed when tuning in a channel"); + +static unsigned int chosen_delsys = SYS_DVBT; +module_param(chosen_delsys, uint, 0644); +MODULE_PARM_DESC(chosen_delsys, + "The delivery system to simulate. Currently supported: DVB-T, DVB-C, DVB-S"); + +static unsigned int ts_buf_sz = 20 * 188; +module_param(ts_buf_sz, uint, 0644); +MODULE_PARM_DESC(ts_buf_sz, "Optional size for the TS buffer"); + +DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nums); + +static int vidtv_start_streaming(struct vidtv_dvb *dvb) +{ + WARN_ON(dvb->streaming); + dvb->streaming = true; + + return 0; +} + +static int vidtv_stop_streaming(struct vidtv_dvb *dvb) +{ + /* mpeg thread will quit */ + dvb->streaming = false; + + return 0; +} + +static int vidtv_start_feed(struct dvb_demux_feed *feed) +{ + struct dvb_demux *demux = feed->demux; + struct vidtv_dvb *dvb = demux->priv; + int rc, ret; + + if (!demux->dmx.frontend) + return -EINVAL; + + mutex_lock(&dvb->feed_lock); + + dvb->nfeeds++; + rc = dvb->nfeeds; + + if (dvb->nfeeds == 1) { + ret = vidtv_start_streaming(dvb); + if (ret < 0) + rc = ret; + } + + mutex_unlock(&dvb->feed_lock); + return rc; +} + +static int vidtv_stop_feed(struct dvb_demux_feed *feed) +{ + struct dvb_demux *demux = feed->demux; + struct vidtv_dvb *dvb = demux->priv; + int err = 0; + + mutex_lock(&dvb->feed_lock); + dvb->nfeeds--; + + if (!dvb->nfeeds) + err = vidtv_stop_streaming(dvb); + + mutex_unlock(&dvb->feed_lock); + return err; +} + +static int vidtv_master_xfer(struct i2c_adapter *i2c_adap, + struct i2c_msg msgs[], + int num) +{ + return 0; +} + +static u32 vidtv_i2c_func(struct i2c_adapter *adapter) +{ + return I2C_FUNC_I2C; +} + +struct i2c_algorithm vidtv_i2c_algorithm = { + .master_xfer = vidtv_master_xfer, + .functionality = vidtv_i2c_func, +}; + +static int vidtv_bridge_i2c_register_adap(struct vidtv_dvb *dvb) +{ + struct i2c_adapter *i2c_adapter = dvb->i2c_adapter; + + strscpy(i2c_adapter->name, "vidtv_i2c", sizeof(i2c_adapter->name)); + i2c_adapter->owner = THIS_MODULE; + i2c_adapter->algo = &vidtv_i2c_algorithm; + i2c_adapter->algo_data = NULL; + i2c_adapter->timeout = 500; + i2c_adapter->retries = 3; + i2c_adapter->dev.parent = NULL; + + i2c_set_adapdata(i2c_adapter, dvb); + return i2c_add_adapter(dvb->i2c_adapter); +} + +static int vidtv_bridge_register_adap(struct vidtv_dvb *dvb) +{ + int ret = 0; + + ret = dvb_register_adapter(&dvb->adapter, + KBUILD_MODNAME, + THIS_MODULE, + &dvb->i2c_adapter->dev, + adapter_nums); + + return ret; +} + +static int vidtv_bridge_dmx_init(struct vidtv_dvb *dvb) +{ + dvb->demux.dmx.capabilities = DMX_TS_FILTERING | + DMX_SECTION_FILTERING; + + dvb->demux.priv = dvb; + dvb->demux.filternum = 256; + dvb->demux.feednum = 256; + dvb->demux.start_feed = vidtv_start_feed; + dvb->demux.stop_feed = vidtv_stop_feed; + + return dvb_dmx_init(&dvb->demux); +} + +static int vidtv_bridge_dmxdev_init(struct vidtv_dvb *dvb) +{ + dvb->dmx_dev.filternum = 256; + dvb->dmx_dev.demux = &dvb->demux.dmx; + dvb->dmx_dev.capabilities = 0; + + return dvb_dmxdev_init(&dvb->dmx_dev, &dvb->adapter); +} + +static void vidtv_bridge_probe_demod(struct vidtv_dvb *dvb, u32 n) +{ + struct vidtv_demod_config cfg = {0}; + + cfg.drop_tslock_prob_on_low_snr = drop_tslock_prob_on_low_snr; + cfg.recover_tslock_prob_on_good_snr = recover_tslock_prob_on_good_snr; + cfg.chosen_delsys = chosen_delsys; + + dvb->i2c_client_demod[n] = dvb_module_probe("vidtv_demod", + NULL, + dvb->i2c_adapter, + DEMOD_DEFAULT_ADDR, + &cfg); + + /* retrieve a pointer to struct dvb_frontend */ + dvb->fe[n] = cfg.frontend; +} + +static void vidtv_bridge_probe_tuner(struct vidtv_dvb *dvb, u32 n) +{ + struct vidtv_tuner_config cfg = {0}; + + cfg.fe = dvb->fe[n]; + cfg.mock_power_up_delay_msec = mock_power_up_delay_msec; + cfg.mock_tune_delay_msec = mock_tune_delay_msec; + + memcpy(cfg.vidtv_valid_dvb_t_freqs, + vidtv_valid_dvb_t_freqs, + sizeof(vidtv_valid_dvb_t_freqs)); + + memcpy(cfg.vidtv_valid_dvb_c_freqs, + vidtv_valid_dvb_c_freqs, + sizeof(vidtv_valid_dvb_c_freqs)); + + memcpy(cfg.vidtv_valid_dvb_s_freqs, + vidtv_valid_dvb_s_freqs, + sizeof(vidtv_valid_dvb_s_freqs)); + + cfg.max_frequency_shift_hz = max_frequency_shift_hz; + + dvb->i2c_client_tuner[n] = dvb_module_probe("vidtv_tuner", + NULL, + dvb->i2c_adapter, + TUNER_DEFAULT_ADDR, + &cfg); +} + +static int vidtv_bridge_dvb_init(struct vidtv_dvb *dvb) +{ + int ret; + int i, j; + + ret = vidtv_bridge_i2c_register_adap(dvb); + if (ret < 0) + goto fail_i2c; + + ret = vidtv_bridge_register_adap(dvb); + if (ret < 0) + goto fail_adapter; + + vidtv_bridge_probe_demod(dvb, 0); + vidtv_bridge_probe_tuner(dvb, 0); + + for (i = 0; i < NUM_FE; ++i) { + ret = dvb_register_frontend(&dvb->adapter, dvb->fe[i]); + if (ret < 0) + goto fail_fe; + } + + ret = vidtv_bridge_dmx_init(dvb); + if (ret < 0) + goto fail_dmx; + + ret = vidtv_bridge_dmxdev_init(dvb); + if (ret < 0) + goto fail_dmx_dev; + + for (j = 0; j < NUM_FE; ++j) { + ret = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, + &dvb->dmx_fe[j]); + if (ret < 0) + goto fail_dmx_conn; + + /* + * The source of the demux is a frontend connected + * to the demux. + */ + dvb->dmx_fe[j].source = DMX_FRONTEND_0; + } + + return ret; + +fail_dmx_conn: + for (j = j - 1; j >= 0; --j) + dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, + &dvb->dmx_fe[j]); +fail_dmx_dev: + dvb_dmxdev_release(&dvb->dmx_dev); +fail_dmx: + dvb_dmx_release(&dvb->demux); +fail_fe: + for (i = i - 1; i >= 0; --i) + dvb_unregister_frontend(dvb->fe[i]); + +fail_adapter: + dvb_unregister_adapter(&dvb->adapter); + +fail_i2c: + i2c_del_adapter(dvb->i2c_adapter); + + return ret; +} + +static int vidtv_bridge_i2c_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int ret; + struct vidtv_dvb *dvb; + + dvb = kzalloc(sizeof(*dvb), GFP_KERNEL); + if (!dvb) + return -ENOMEM; + + ret = vidtv_bridge_dvb_init(dvb); + if (ret < 0) + goto err_dvb; + + mutex_init(&dvb->feed_lock); + + i2c_set_clientdata(client, dvb); + + return ret; + +err_dvb: + kfree(dvb); + return ret; +} + +static int vidtv_bridge_i2c_remove(struct i2c_client *client) +{ + struct vidtv_dvb *dvb; + u32 i; + + dvb = i2c_get_clientdata(client); + + mutex_destroy(&dvb->feed_lock); + + for (i = 0; i < NUM_FE; ++i) + dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, + &dvb->dmx_fe[i]); + + dvb_dmxdev_release(&dvb->dmx_dev); + dvb_dmx_release(&dvb->demux); + + for (i = 0; i < NUM_FE; ++i) { + dvb_unregister_frontend(dvb->fe[i]); + dvb_frontend_detach(dvb->fe[i]); + } + + dvb_unregister_adapter(&dvb->adapter); + + return 0; +} + +static const struct i2c_device_id vidtv_bridge_id_table[] = { + {"vidtv_bridge", 0}, + {} +}; + +MODULE_DEVICE_TABLE(i2c, vidtv_bridge_id_table); + +static struct i2c_driver vidtv_bridge_driver = { + .driver = { + .name = "vidtv_bridge", + .suppress_bind_attrs = true, + }, + .probe = vidtv_bridge_i2c_probe, + .remove = vidtv_bridge_i2c_remove, + .id_table = vidtv_bridge_id_table, +}; + +module_i2c_driver(vidtv_bridge_driver); diff --git a/drivers/media/test-drivers/vidtv/vidtv_bridge.h b/drivers/media/test-drivers/vidtv/vidtv_bridge.h new file mode 100644 index 0000000000000..ef5c7cd2d64e3 --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_bridge.h @@ -0,0 +1,37 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * The Virtual DTV test driver serves as a reference DVB driver and helps + * validate the existing APIs in the media subsystem. It can also aid + * developers working on userspace applications. + * + * Written by Daniel W. S. Almeida + */ + +#ifndef VIDTV_BRIDGE_H +#define VIDTV_BRIDGE_H + +#define NUM_FE 1 + +#include +#include +#include +#include +#include + +struct vidtv_dvb { + struct dvb_frontend *fe[NUM_FE]; + struct dvb_adapter adapter; + struct dvb_demux demux; + struct dmxdev dmx_dev; + struct dmx_frontend dmx_fe[NUM_FE]; + struct i2c_adapter *i2c_adapter; + struct i2c_client *i2c_client_demod[NUM_FE]; + struct i2c_client *i2c_client_tuner[NUM_FE]; + + u32 nfeeds; + struct mutex feed_lock; /* start/stop feed */ + + bool streaming; +}; + +#endif // VIDTV_BRIDGE_H From patchwork Sat May 2 03:22:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Almeida X-Patchwork-Id: 63509 Received: from vger.kernel.org ([23.128.96.18]) by www.linuxtv.org with esmtp (Exim 4.92) (envelope-from ) id 1jUigp-007NVn-Hs; Sat, 02 May 2020 03:19:44 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727866AbgEBDWy (ORCPT + 1 other); Fri, 1 May 2020 23:22:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39940 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726439AbgEBDWx (ORCPT ); Fri, 1 May 2020 23:22:53 -0400 Received: from mail-qk1-x741.google.com (mail-qk1-x741.google.com [IPv6:2607:f8b0:4864:20::741]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6C193C061A0C; Fri, 1 May 2020 20:22:53 -0700 (PDT) Received: by mail-qk1-x741.google.com with SMTP id c63so11238441qke.2; Fri, 01 May 2020 20:22:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=wLSxbksYe7vFAl+dAChpvHeW8F9QhUMpS/+xzmVyhR4=; b=PKcEoF52OoEQuSEvPnG7/F79zFA430vYjff3uLEaOAC77ileYYAVSA3SXQsDIKw+M3 HcDrfcuFrS/QUQDnpcCexhoyiNE6QsrA6UfmN9q4uiJTghyxQeUsPDShKXdG/o3qdYrU 9zeUjwc62srL/KTat/i1wO8BwvcelbUaGQUnZ4LmUpjrXbThKdrTP0i33IZVSfiIXT7W S7hxlYaUwhbEEaJkdnH+zwPfiAqI8DD3GGTLqEd6e0e9T+MDbfP3IVSDoTgMEDF0h/HM tsdL8nF1s3fr3RLhxwQybv0usgeJCk5BKLikcnCnJv0EdFROOp9pOVkcxoG2XGRwlTWj Ndbg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=wLSxbksYe7vFAl+dAChpvHeW8F9QhUMpS/+xzmVyhR4=; b=V3mLbD60WRWf4qNzGMP1GktEV163Dy6SnWCzoujOz95kUAod7rEzseGZayu1ny6sqH rbNdU3yTMootGxTpd/wXWWoZvNuZ00c4VBnuzmhoUYDU96gv+L6mvLQMensxkW8eL4XZ U1dPRBZJwy0KxDoL+14HTZv16MQtAO/9Ja8BsKayzrpz1acl5eq4M4OEyuJRM6t8K3jz 3cpXEDNo5zl7woFNNKIkgMOihK98ZWpZ9o/CTNGoMHbgGnt6PBa5F7yslBMwze38R8RT FHnPzszQtnMRzLFibIv3xlQdWOThux+EqlGdG1Mp5eQEJ/+fMzFiQ1o4LygpZFuiKU7C hUlg== X-Gm-Message-State: AGi0PuZBdnisxXNGt00hFAcK1AZkqJUPUzLna1TZdRk3qe+ZhlAzOZfh Shhqn30sD1yQ2et28LU1UQg= X-Google-Smtp-Source: APiQypJb3IAWNuPS7msR8bj0xvAODcxZmScGMJAQQ2/JpuoFHKaMLO78YDuwxGvzgaCnE85MOVC0nw== X-Received: by 2002:a37:792:: with SMTP id 140mr6325361qkh.58.1588389772555; Fri, 01 May 2020 20:22:52 -0700 (PDT) Received: from localhost.localdomain ([2804:18:602b:723a:1b2a:57a1:a611:34ed]) by smtp.gmail.com with ESMTPSA id c41sm4410399qta.96.2020.05.01.20.22.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 May 2020 20:22:52 -0700 (PDT) From: "Daniel W. S. Almeida" X-Google-Original-From: Daniel W. S. Almeida To: mchehab+huawei@kernel.org, sean@mess.org, kstewart@linuxfoundation.org, allison@lohutok.net, tglx@linutronix.de Cc: "Daniel W. S. Almeida" , linux-media@vger.kernel.org, skhan@linuxfoundation.org, linux-kernel-mentees@lists.linuxfoundation.org, linux-kernel@vger.kernel.org Subject: [RFC, WIP, v4 06/11] media: vidtv: add wrappers for memcpy and memset Date: Sat, 2 May 2020 00:22:11 -0300 Message-Id: <20200502032216.197977-7-dwlsalmeida@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200502032216.197977-1-dwlsalmeida@gmail.com> References: <20200502032216.197977-1-dwlsalmeida@gmail.com> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-LSpam-Score: -2.5 (--) X-LSpam-Report: No, score=-2.5 required=5.0 tests=BAYES_00=-1.9,DKIM_SIGNED=0.1,DKIM_VALID=-0.1,DKIM_VALID_AU=-0.1,FREEMAIL_FORGED_FROMDOMAIN=0.001,FREEMAIL_FROM=0.001,HEADER_FROM_DIFFERENT_DOMAINS=0.5,MAILING_LIST_MULTI=-1 autolearn=ham autolearn_force=no From: "Daniel W. S. Almeida" A lot of code in this driver is for serializing structures. This is error prone. Therefore, prevent buffer overflows by wrapping memcpy and memset, comparing the requested length against the buffer size. Signed-off-by: Daniel W. S. Almeida --- drivers/media/test-drivers/vidtv/Makefile | 3 ++ .../media/test-drivers/vidtv/vidtv_common.c | 44 +++++++++++++++++++ .../media/test-drivers/vidtv/vidtv_common.h | 28 ++++++++++++ 3 files changed, 75 insertions(+) create mode 100644 drivers/media/test-drivers/vidtv/vidtv_common.c create mode 100644 drivers/media/test-drivers/vidtv/vidtv_common.h diff --git a/drivers/media/test-drivers/vidtv/Makefile b/drivers/media/test-drivers/vidtv/Makefile index a9f1993dd5443..9ea9485d42189 100644 --- a/drivers/media/test-drivers/vidtv/Makefile +++ b/drivers/media/test-drivers/vidtv/Makefile @@ -1,3 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 +vidtv_demod-objs := vidtv_common.o +vidtv_bridge-objs := vidtv_common.o + obj-$(CONFIG_DVB_VIDTV) += vidtv_tuner.o vidtv_demod.o vidtv_bridge.o diff --git a/drivers/media/test-drivers/vidtv/vidtv_common.c b/drivers/media/test-drivers/vidtv/vidtv_common.c new file mode 100644 index 0000000000000..28f10630499a9 --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_common.c @@ -0,0 +1,44 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * The Virtual DVB test driver serves as a reference DVB driver and helps + * validate the existing APIs in the media subsystem. It can also aid + * developers working on userspace applications. + * + * Written by Daniel W. S. Almeida + */ + +#include +#include +#include + +u32 vidtv_memcpy(void *to, + const void *from, + size_t len, + u32 offset, + u32 buf_sz) +{ + if (buf_sz && offset + len > buf_sz) { + pr_err("%s: overflow detected, skipping. Try increasing the buffer size", + __func__); + return 0; + } + + memcpy(to, from, len); + return len; +} + +u32 vidtv_memset(void *to, + int c, + size_t len, + u32 offset, + u32 buf_sz) +{ + if (buf_sz && offset + len > buf_sz) { + pr_err("%s: overflow detected, skipping. Try increasing the buffer size", + __func__); + return 0; + } + + memset(to, c, len); + return len; +} diff --git a/drivers/media/test-drivers/vidtv/vidtv_common.h b/drivers/media/test-drivers/vidtv/vidtv_common.h new file mode 100644 index 0000000000000..64072c010dc66 --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_common.h @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * The Virtual DVB test driver serves as a reference DVB driver and helps + * validate the existing APIs in the media subsystem. It can also aid + * developers working on userspace applications. + * + * Written by Daniel W. S. Almeida + */ + +#ifndef VIDTV_COMMON_H +#define VIDTV_COMMON_H + +#include +#include + +u32 vidtv_memcpy(void *to, + const void *from, + size_t len, + u32 offset, + u32 buf_sz); + +u32 vidtv_memset(void *to, + int c, + size_t len, + u32 offset, + u32 buf_sz); + +#endif // VIDTV_COMMON_H From patchwork Sat May 2 03:22:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Almeida X-Patchwork-Id: 63510 Received: from vger.kernel.org ([23.128.96.18]) by www.linuxtv.org with esmtp (Exim 4.92) (envelope-from ) id 1jUigu-007NWh-Qo; Sat, 02 May 2020 03:19:49 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727890AbgEBDW7 (ORCPT + 1 other); Fri, 1 May 2020 23:22:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39952 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726439AbgEBDW6 (ORCPT ); Fri, 1 May 2020 23:22:58 -0400 Received: from mail-qt1-x841.google.com (mail-qt1-x841.google.com [IPv6:2607:f8b0:4864:20::841]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 06FD7C061A0E; Fri, 1 May 2020 20:22:58 -0700 (PDT) Received: by mail-qt1-x841.google.com with SMTP id b1so9557706qtt.1; Fri, 01 May 2020 20:22:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=j9T0sUjzus57nQX3/1aTAi2/PzSdq5kO5uH1qanv+VM=; b=WAnk+iEhDMCNqbqS9lfGR85tTSPeKzmUkI25Zwao4HFSD1euRhc9gOOVQ+Kh4io4LA EM517TClNjTAJj87a5rqr46N81wsIrWtEoo7mqplYfaqGVvUdVV4/WS2KhlvhfeyCqq7 74+pEsDMyiP1aWtHTLitrWViRn6G/EqGPG5MFplWqA59ORU0eTBE1YvwXl/77w+rzAjp e4ngl55bWXiTxUs2Rs+0vdPpV/TYTu+8H91UgQtMAmpxuS/Sj5TpDVtJMdFOqyzEla0l /0eDA/tGN+KHGHgxwixBdLVLzCeN2rqDwT/6Q/dWSydCTZF+1u2U+2l/kq+Bo0NYU4Dj QhMQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=j9T0sUjzus57nQX3/1aTAi2/PzSdq5kO5uH1qanv+VM=; b=byqgOaRTmvj0dCvgQ6hIvxbboRLQWOJthyCMY0Rr9mq5nvFGT3cfxrpLIErb449ndW 2JBI+s68o8aV6TECK/EPQY7q0J9S9m4DPTZ8sTBygKJjHRjhI6309T5TQdinG6a7oJRF AA2SLpS13TNGKosmRd7SoUBaoOyjvXioWeWZCQLhYrE4iOLg3XYqi8hV2gWPfGwuiV4U hcjH0ceJ0T7Zl8l/8P9500VGhEguDtFs8QRoB3DAdMHeNfBAxELZ0rvruo+bcFoW+quB 7o8IC3OqadGaQKvG+/3Rz9Sga9cQ5CFE+8xm8vuDVOWoepQSCeSU+fkKxQtaovOnXCxX Q+YA== X-Gm-Message-State: AGi0Pubpn198UtVTnbAVw5CeihCiYDrNDECDtuVPn33OXB1pWVnG5D0+ NoBq0pdVX6TDo4p5Evlh+vQ= X-Google-Smtp-Source: APiQypL9x3757gA7ZdWFRnQp5KbLEBJY3dJZUvR9zlkavh6HA0rHE8slrfDimJ2b38nuhzxEGGxv4w== X-Received: by 2002:ac8:720f:: with SMTP id a15mr6656883qtp.207.1588389777113; Fri, 01 May 2020 20:22:57 -0700 (PDT) Received: from localhost.localdomain ([2804:18:602b:723a:1b2a:57a1:a611:34ed]) by smtp.gmail.com with ESMTPSA id c41sm4410399qta.96.2020.05.01.20.22.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 May 2020 20:22:56 -0700 (PDT) From: "Daniel W. S. Almeida" X-Google-Original-From: Daniel W. S. Almeida To: mchehab+huawei@kernel.org, sean@mess.org, kstewart@linuxfoundation.org, allison@lohutok.net, tglx@linutronix.de Cc: "Daniel W. S. Almeida" , linux-media@vger.kernel.org, skhan@linuxfoundation.org, linux-kernel-mentees@lists.linuxfoundation.org, linux-kernel@vger.kernel.org Subject: [RFC, WIP, v4 07/11] media: vidtv: add MPEG TS common code Date: Sat, 2 May 2020 00:22:12 -0300 Message-Id: <20200502032216.197977-8-dwlsalmeida@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200502032216.197977-1-dwlsalmeida@gmail.com> References: <20200502032216.197977-1-dwlsalmeida@gmail.com> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-LSpam-Score: -2.5 (--) X-LSpam-Report: No, score=-2.5 required=5.0 tests=BAYES_00=-1.9,DKIM_SIGNED=0.1,DKIM_VALID=-0.1,DKIM_VALID_AU=-0.1,FREEMAIL_FORGED_FROMDOMAIN=0.001,FREEMAIL_FROM=0.001,HEADER_FROM_DIFFERENT_DOMAINS=0.5,MAILING_LIST_MULTI=-1 autolearn=ham autolearn_force=no From: "Daniel W. S. Almeida" Add code to work with MPEG TS packets, such as TS headers, adaptation fields, PCR packets and NULL packets. Signed-off-by: Daniel W. S. Almeida --- drivers/media/test-drivers/vidtv/Makefile | 2 +- drivers/media/test-drivers/vidtv/vidtv_ts.c | 130 ++++++++++++++++++++ drivers/media/test-drivers/vidtv/vidtv_ts.h | 103 ++++++++++++++++ 3 files changed, 234 insertions(+), 1 deletion(-) create mode 100644 drivers/media/test-drivers/vidtv/vidtv_ts.c create mode 100644 drivers/media/test-drivers/vidtv/vidtv_ts.h diff --git a/drivers/media/test-drivers/vidtv/Makefile b/drivers/media/test-drivers/vidtv/Makefile index 9ea9485d42189..92001bc348615 100644 --- a/drivers/media/test-drivers/vidtv/Makefile +++ b/drivers/media/test-drivers/vidtv/Makefile @@ -1,6 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 vidtv_demod-objs := vidtv_common.o -vidtv_bridge-objs := vidtv_common.o +vidtv_bridge-objs := vidtv_common.o vidtv_ts.o obj-$(CONFIG_DVB_VIDTV) += vidtv_tuner.o vidtv_demod.o vidtv_bridge.o diff --git a/drivers/media/test-drivers/vidtv/vidtv_ts.c b/drivers/media/test-drivers/vidtv/vidtv_ts.c new file mode 100644 index 0000000000000..f545c45c0fe7c --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_ts.c @@ -0,0 +1,130 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * The Virtual DVB test driver serves as a reference DVB driver and helps + * validate the existing APIs in the media subsystem. It can also aid + * developers working on userspace applications. + * + * Written by Daniel W. S. Almeida + */ + +#include +#include +#include "vidtv_ts.h" +#include "vidtv_common.h" + +static u32 vidtv_ts_write_pcr_bits(u8 *buf, u64 pcr) +{ + /* Exact same from ffmpeg. PCR is a counter driven by a 27Mhz clock */ + u64 pcr_low = pcr % 300, pcr_high = pcr / 300; + + *buf++ = pcr_high >> 25; + *buf++ = pcr_high >> 17; + *buf++ = pcr_high >> 9; + *buf++ = pcr_high >> 1; + *buf++ = pcr_high << 7 | pcr_low >> 8 | 0x7e; + *buf++ = pcr_low; + + return 6; +} + +void vidtv_ts_inc_cc(u8 *continuity_counter) +{ + ++*continuity_counter; + if (*continuity_counter > TS_CC_MAX_VAL) + *continuity_counter = 0; +} + +u32 vidtv_ts_null_write_into(struct null_packet_write_args args) +{ + u32 nbytes = 0; + struct vidtv_mpeg_ts ts_header = {0}; + + ts_header.sync_byte = TS_SYNC_BYTE; + ts_header.pid = TS_NULL_PACKET_PID; + ts_header.payload = 1; + ts_header.continuity_counter = *args.continuity_counter; + + cpu_to_be16s(&ts_header.bitfield); + + /* copy TS header */ + nbytes += vidtv_memcpy(args.dest_buf + args.dest_offset + nbytes, + &ts_header, + sizeof(ts_header), + args.dest_offset + nbytes, + args.buf_sz); + + be16_to_cpus(&ts_header.bitfield); + + vidtv_ts_inc_cc(args.continuity_counter); + + /* fill the rest with empty data */ + nbytes += vidtv_memset(args.dest_buf + args.dest_offset + nbytes, + 0xff, + TS_PACKET_LEN - nbytes, + args.dest_offset + nbytes, + args.buf_sz); + + /* we should have written exactly _one_ 188byte packet */ + WARN_ON(nbytes != TS_PACKET_LEN); + + return nbytes; +} + +u32 vidtv_ts_pcr_write_into(struct pcr_write_args args) +{ + u32 nbytes = 0; + struct vidtv_mpeg_ts ts_header = {0}; + struct vidtv_mpeg_ts_adaption ts_adap = {0}; + + ts_header.sync_byte = TS_SYNC_BYTE; + ts_header.tei = 0; + ts_header.payload_start = 0; + ts_header.pid = args.pid; + ts_header.priority = 0; + ts_header.scrambling = 0; + /* cc is not incremented, see 13818-1 clause 2.4.3.3 */ + ts_header.continuity_counter = *args.continuity_counter; + ts_header.payload = 0; + ts_header.adaptation_field = 1; + + /* 13818-1 clause 2.4.3.5 */ + ts_adap.length = 183; + ts_adap.PCR = 1; + + cpu_to_be16s(&ts_header.bitfield); + + /* copy TS header */ + nbytes += vidtv_memcpy(args.dest_buf + args.dest_offset + nbytes, + &ts_header, + sizeof(ts_header), + args.dest_offset + nbytes, + args.buf_sz); + + be16_to_cpus(&ts_header.bitfield); + + /* write the adap after the TS header */ + nbytes += vidtv_memcpy(args.dest_buf + args.dest_offset + nbytes, + &ts_adap, + sizeof(ts_adap), + args.dest_offset + nbytes, + args.buf_sz); + + /* write the PCR optional */ + cpu_to_be64s(&args.pcr); + nbytes += vidtv_ts_write_pcr_bits(args.dest_buf + + args.dest_offset + + nbytes, + args.pcr); + be64_to_cpus(&args.pcr); + + nbytes += vidtv_memset(args.dest_buf + args.dest_offset + nbytes, + 0xff, + TS_PACKET_LEN - nbytes, + args.dest_offset + nbytes, + args.buf_sz); + + /* we should have written exactly _one_ 188byte packet */ + WARN_ON(nbytes != TS_PACKET_LEN); + + return nbytes; +} diff --git a/drivers/media/test-drivers/vidtv/vidtv_ts.h b/drivers/media/test-drivers/vidtv/vidtv_ts.h new file mode 100644 index 0000000000000..2c07bddc46119 --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_ts.h @@ -0,0 +1,103 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * The Virtual DVB test driver serves as a reference DVB driver and helps + * validate the existing APIs in the media subsystem. It can also aid + * developers working on userspace applications. + * + * Written by Daniel W. S. Almeida + */ + +#ifndef VIDTV_TS_H +#define VIDTV_TS_H + +#include +#include + +#define TS_SYNC_BYTE 0x47 +#define TS_PACKET_LEN 188 +#define TS_PAYLOAD_LEN 184 +#define TS_NULL_PACKET_PID 0x1fff +#define TS_CC_MAX_VAL 0x0f /* 4 bits */ +#define TS_LAST_VALID_PID 8191 + +struct vidtv_mpeg_ts_adaption { + u8 length; + struct { +#if defined(__LITTLE_ENDIAN_BITFIELD) + u8 extension:1; + u8 private_data:1; + u8 splicing_point:1; + u8 OPCR:1; + u8 PCR:1; + u8 priority:1; + u8 random_access:1; + u8 discontinued:1; +#elif defined(__BIG_ENDIAN_BITFIELD) + u8 discontinued:1; + u8 random_access:1; + u8 priority:1; + u8 PCR:1; + u8 OPCR:1; + u8 splicing_point:1; + u8 private_data:1; + u8 extension:1; +#else +#error "Please fix " +#endif + } __packed; + u8 data[]; +} __packed; + +struct vidtv_mpeg_ts { + u8 sync_byte; + union { + u16 bitfield; + struct { + u16 pid:13; + u16 priority:1; + u16 payload_start:1; + u16 tei:1; + } __packed; + } __packed; + struct { +#if defined(__LITTLE_ENDIAN_BITFIELD) + u8 continuity_counter:4; + u8 payload:1; + u8 adaptation_field:1; + u8 scrambling:2; +#elif defined(__BIG_ENDIAN_BITFIELD) + u8 scrambling:2; + u8 adaptation_field:1; + u8 payload:1; + u8 continuity_counter:4; +#else +#error "Please fix " +#endif + } __packed; + struct vidtv_mpeg_ts_adaption adaption[]; +} __packed; + +struct pcr_write_args { + void *dest_buf; /* The buffer to write into */ + u32 dest_offset; /* The byte offset into the buffer */ + u16 pid; /* the TS PID for the PCR packets */ + u32 buf_sz; /* protect against overflow when this field is not zero */ + u8 *continuity_counter; + u64 pcr; /* A sample from the system clock */ +}; + +struct null_packet_write_args { + void *dest_buf;/* The buffer to write into */ + u32 dest_offset;/* The byte offset into the buffer */ + u32 buf_sz; /* protect against overflow when this field is not zero */ + u8 *continuity_counter; +}; + +/* Increment the continuity counter */ +void vidtv_ts_inc_cc(u8 *continuity_counter); + +u32 vidtv_ts_null_write_into(struct null_packet_write_args args); + +u32 vidtv_ts_pcr_write_into(struct pcr_write_args args); + +#endif //VIDTV_TS_H From patchwork Sat May 2 03:22:13 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Almeida X-Patchwork-Id: 63511 Received: from vger.kernel.org ([23.128.96.18]) by www.linuxtv.org with esmtp (Exim 4.92) (envelope-from ) id 1jUih1-007NX3-0c; Sat, 02 May 2020 03:19:58 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727919AbgEBDXF (ORCPT + 1 other); Fri, 1 May 2020 23:23:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39970 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726439AbgEBDXE (ORCPT ); Fri, 1 May 2020 23:23:04 -0400 Received: from mail-qk1-x72c.google.com (mail-qk1-x72c.google.com [IPv6:2607:f8b0:4864:20::72c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C139BC061A0C; Fri, 1 May 2020 20:23:03 -0700 (PDT) Received: by mail-qk1-x72c.google.com with SMTP id s9so8521086qkm.6; Fri, 01 May 2020 20:23:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=xlmbbLp+nOuTpXKJjXY1Ad93iVRGpa39h7/Cz7yx3ZI=; b=Z+WF1l9+NGW/NOGnJaHcAa1Vw/EsEg5bZbWfBwmCZ3hELd8vG9EigBXb48vP5t/YXO xZFdCuWTWuh7k8DmYgPTO5YGbaM4fTqHiI7Dv4aa7nmfCXhsHa0Ay2ldl4xf41UJsLmC OsvAsABzpN/ZXS34npxaZdGwffXXt8VTCBgOgV3TSzQxGyRqAxkw7YdsN1XcOyJrBeos WMhzSIMnlKibK9/71LoLdHCUSwRzT303ZnoCu+3fdmikEjmB5oRdxalDMt27AFGGPR6H EEe1D9z5SR5qCKE/3ZA2SRk1TW144da4MoCRmyejd4d8iyqUw8mklxRvc45oUuy5C0WX fegA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=xlmbbLp+nOuTpXKJjXY1Ad93iVRGpa39h7/Cz7yx3ZI=; b=eKHLB+o755t82oEM29RRJDJz4GSiSPNra08Xh6DV+0ZId/A3u1M8N2xk66aRSXbjSm BTeejxzHVQWpOelEajsia4aQ+xsYxoHiXimw6HKwllNkvDtfiEpt+Z2QRtGXyTUraKIa 4rLMzoKtWpqrCg3qZn49uRqRI+eOhqNWzxx7aa75TNbaXlflh30eZU6Jc9j2gHekZVZt CCucvn9WM/Mcdnpcc+ZgpCxY4racgl03uMJRgkJhzzTAVN5V/nRFXSMzz1pBnzQcgxd8 jhJ+S6oyHYp6w4YiBSVMLhYtBQQWhPiejEw+GHo8dZota9NsftIlZvVygqoKiL8z54G+ G4Xw== X-Gm-Message-State: AGi0PuYIREZZQdYIJYmRgIndUT435COyKnTYYut7wGozb20C3uEPQIZX OcIktowCJ+NQhI5OAjPWCK8= X-Google-Smtp-Source: APiQypKW7N0nrTt/2/1Abkw0sx2Ww5+Hv4B6PP2egYJzX13wiY49/xskipw+F68g/mn4OXd6PoWBoQ== X-Received: by 2002:a37:793:: with SMTP id 141mr6837272qkh.110.1588389782446; Fri, 01 May 2020 20:23:02 -0700 (PDT) Received: from localhost.localdomain ([2804:18:602b:723a:1b2a:57a1:a611:34ed]) by smtp.gmail.com with ESMTPSA id c41sm4410399qta.96.2020.05.01.20.22.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 May 2020 20:23:01 -0700 (PDT) From: "Daniel W. S. Almeida" X-Google-Original-From: Daniel W. S. Almeida To: mchehab+huawei@kernel.org, sean@mess.org, kstewart@linuxfoundation.org, allison@lohutok.net, tglx@linutronix.de Cc: "Daniel W. S. Almeida" , linux-media@vger.kernel.org, skhan@linuxfoundation.org, linux-kernel-mentees@lists.linuxfoundation.org, linux-kernel@vger.kernel.org Subject: [RFC, WIP, v4 08/11] media: vidtv: implement a PSI generator Date: Sat, 2 May 2020 00:22:13 -0300 Message-Id: <20200502032216.197977-9-dwlsalmeida@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200502032216.197977-1-dwlsalmeida@gmail.com> References: <20200502032216.197977-1-dwlsalmeida@gmail.com> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-LSpam-Score: -2.5 (--) X-LSpam-Report: No, score=-2.5 required=5.0 tests=BAYES_00=-1.9,DKIM_SIGNED=0.1,DKIM_VALID=-0.1,DKIM_VALID_AU=-0.1,FREEMAIL_FORGED_FROMDOMAIN=0.001,FREEMAIL_FROM=0.001,HEADER_FROM_DIFFERENT_DOMAINS=0.5,MAILING_LIST_MULTI=-1 autolearn=ham autolearn_force=no From: "Daniel W. S. Almeida" PSI packets contain general information about a MPEG Transport Stream. A PSI generator is needed so userspace apps can retrieve information about the Transport Stream and eventually tune into a (dummy) channel. Because the generator is implemented in a separate file, it can be reused elsewhere in the media subsystem. Currently this commit adds support for working with 3 PSI tables: PAT, PMT and SDT. Signed-off-by: Daniel W. S. Almeida --- drivers/media/test-drivers/vidtv/Makefile | 2 +- drivers/media/test-drivers/vidtv/vidtv_psi.c | 1137 ++++++++++++++++++ drivers/media/test-drivers/vidtv/vidtv_psi.h | 357 ++++++ 3 files changed, 1495 insertions(+), 1 deletion(-) create mode 100644 drivers/media/test-drivers/vidtv/vidtv_psi.c create mode 100644 drivers/media/test-drivers/vidtv/vidtv_psi.h diff --git a/drivers/media/test-drivers/vidtv/Makefile b/drivers/media/test-drivers/vidtv/Makefile index 92001bc348615..e4f744aa53136 100644 --- a/drivers/media/test-drivers/vidtv/Makefile +++ b/drivers/media/test-drivers/vidtv/Makefile @@ -1,6 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 vidtv_demod-objs := vidtv_common.o -vidtv_bridge-objs := vidtv_common.o vidtv_ts.o +vidtv_bridge-objs := vidtv_common.o vidtv_ts.o vidtv_psi.o obj-$(CONFIG_DVB_VIDTV) += vidtv_tuner.o vidtv_demod.o vidtv_bridge.o diff --git a/drivers/media/test-drivers/vidtv/vidtv_psi.c b/drivers/media/test-drivers/vidtv/vidtv_psi.c new file mode 100644 index 0000000000000..191d37a248923 --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_psi.c @@ -0,0 +1,1137 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * This file contains the logic to work with MPEG Program-Specific Information. + * These are defined both in ISO/IEC 13818-1 (systems) and ETSI EN 300 468. + * PSI is carried in the form of table structures, and although each table might + * technically be broken into one or more sections, we do not do this here, + * hence 'table' and 'section' are interchangeable for us. + * + * This code currently supports three tables: PAT, PMT and SDT. These are the + * bare minimum to get userspace to recognize our MPEG transport stream. It can + * be extended to support more PSI tables in the future. + * + * A note on endianness: MPEG layout is big-endian, therefore: + * - All fields spanning more than a byte must undergo 'cpu_to_beXX()' before + * serialization. These convertions are done in the *_write_into() functions. + * + * - All byte sized bitfields must have their ordering reversed if + * __LITTLE_ENDIAN_BITFIELD is defined. + * + * Written by: Daniel W. S. Almeida + */ + +#include +#include +#include +#include +#include +#include + +#include "vidtv_psi.h" +#include "vidtv_common.h" +#include "vidtv_ts.h" + +#define CRC_SIZE_IN_BYTES 4 + +static u32 vidtv_psi_ts_psi_write_stuffing(void *to, + u32 len, + u32 offset, + u32 buf_sz) +{ + return vidtv_memset(to, 0xff, len, offset, buf_sz); +} + +static u32 +vidtv_psi_ts_psi_write_into(struct psi_write_args args) +{ + /* + * Packetize PSI sections into TS packets: + * push a TS header (4bytes) every 184 bytes + * manage the continuity_counter + * add stuffing after the CRC + */ + + u32 nbytes_past_boundary = (args.dest_offset % TS_PACKET_LEN); + bool aligned = nbytes_past_boundary == 0; + + /* + * whether we need to fragment the data into multiple ts packets + * if we are aligned we need to spare one byte for the pointer_field + */ + bool split = (aligned) ? + args.len > TS_PAYLOAD_LEN - 1 : + nbytes_past_boundary + args.len > TS_PACKET_LEN; + + /* how much we can write in this packet */ + u32 payload_write_len = (split) ? + (aligned) ? TS_PAYLOAD_LEN : + TS_PACKET_LEN - nbytes_past_boundary : + args.len; + + struct psi_write_args new_args = {0}; + struct vidtv_mpeg_ts ts_header = {0}; + + u32 nbytes = 0; /* number of bytes written by this function */ + u32 temp = 0; + + /* Just a sanity check, should not really happen because we stuff + * the packet when we finish a section, i.e. when we write the crc at + * the end. But if this happens then we have messed up the logic + * somewhere. + */ + WARN_ON(args.new_psi_section && !aligned); + + if (aligned) { + /* if at a packet boundary, write a new TS header */ + ts_header.sync_byte = TS_SYNC_BYTE; + ts_header.tei = 0; + ts_header.payload_start = 1; + ts_header.pid = args.pid; + ts_header.priority = 0; + ts_header.scrambling = 0; + ts_header.continuity_counter = *args.continuity_counter; + ts_header.payload = 1; + /* no adaptation field */ + ts_header.adaptation_field = 0; + + cpu_to_be16s(&ts_header.bitfield); + + /* copy the header */ + nbytes += vidtv_memcpy(args.dest_buf + + args.dest_offset + + nbytes, + &ts_header, + sizeof(ts_header), + args.dest_offset + nbytes, + args.dest_buf_sz); + + be16_to_cpus(&ts_header.bitfield); + + /* + * increment the countinuity counter since we have started + * a new packet + */ + vidtv_ts_inc_cc(args.continuity_counter); + } + + if (args.new_psi_section) { + /* write the pointer_field in the first byte of the payload */ + temp = vidtv_memset(args.dest_buf + args.dest_offset + nbytes, + 0x0, + 1, + args.dest_offset + nbytes, + args.dest_buf_sz); + /* one byte was used by the pointer field*/ + nbytes += temp; + if (payload_write_len == TS_PAYLOAD_LEN) + payload_write_len -= temp; + } + + /* write as much of the payload as we possibly can */ + nbytes += vidtv_memcpy(args.dest_buf + args.dest_offset + nbytes, + args.from, + payload_write_len, + args.dest_offset + nbytes, + args.dest_buf_sz); + + if (split) { + /* 'payload_write_len' written from a total of 'len' requested*/ + args.len -= payload_write_len; + /* + * recursively write the rest of the data until we do not + * need to split it anymore + */ + memcpy(&new_args, &args, sizeof(struct psi_write_args)); + new_args.from = args.from + payload_write_len; + new_args.dest_offset = args.dest_offset + nbytes; + new_args.new_psi_section = false; + + nbytes += vidtv_psi_ts_psi_write_into(new_args); + } + + /* + * as the CRC is last in the section, stuff the rest of the + * packet if there is any remaining space in there + */ + if (args.is_crc) + nbytes += vidtv_psi_ts_psi_write_stuffing(args.dest_buf + + args.dest_offset + + nbytes, + TS_PACKET_LEN - + payload_write_len, + args.dest_offset + + nbytes, + args.dest_buf_sz); + + return nbytes; +} + +static u32 table_section_crc32_write_into(struct crc32_write_args args) +{ + /* the CRC is the last entry in the section */ + u32 nbytes = 0; + u32 crc; + struct psi_write_args psi_args = {0}; + + crc = crc32_be(0, args.dest_buf, args.dest_offset); + + psi_args.dest_buf = args.dest_buf; + psi_args.from = &crc; + psi_args.len = CRC_SIZE_IN_BYTES; + psi_args.dest_offset = args.dest_offset; + psi_args.pid = args.pid; + psi_args.new_psi_section = false; + psi_args.continuity_counter = args.continuity_counter; + psi_args.is_crc = true; + psi_args.dest_buf_sz = args.dest_buf_sz; + + cpu_to_be32s(&crc); + nbytes += vidtv_psi_ts_psi_write_into(psi_args); + be32_to_cpus(&crc); + + return nbytes; +} + +struct vidtv_psi_desc *vidtv_psi_desc_init(struct vidtv_psi_desc *head, + u8 type, + u8 length) +{ + struct vidtv_psi_desc *desc; + + /* alloc enough memory for the flexible array too */ + desc = kzalloc(sizeof(*desc) + length, GFP_KERNEL); + + desc->type = type; + desc->length = length; + + if (head) { + while (head->next) + head = head->next; + + head->next = desc; + } + + return desc; +} + +void vidtv_psi_desc_destroy(struct vidtv_psi_desc *desc) +{ + struct vidtv_psi_desc *curr = desc; + struct vidtv_psi_desc *tmp = NULL; + + while (curr) { + tmp = curr; + curr = curr->next; + kfree(tmp); + } +} + +static u32 +vidtv_psi_desc_comp_len(struct vidtv_psi_desc *desc) +{ + u32 length = 0; + + if (!desc) + return 0; + + while (desc) { + length += desc->length; + desc = desc->next; + } + + return length; +} + +void vidtv_psi_desc_assign(struct vidtv_psi_desc **to, + struct vidtv_psi_desc *desc) +{ + /* + * Caller must recompute the section length afterwards at some point + * This function transfers ownedship of desc. + * Start by cleaning the old data + */ + if (*to) + vidtv_psi_desc_destroy(*to); + + *to = desc; /* reassign pointer */ +} + +static void vidtv_psi_desc_to_be(struct vidtv_psi_desc *desc) +{ + /* + * Convert descriptor endianness to big-endian on a field-by-field basis + * where applicable + */ + + switch (desc->type) { + /* nothing do do */ + case SERVICE_DESCRIPTOR: + break; + case REGISTRATION_DESCRIPTOR: + cpu_to_be32s(&((struct vidtv_psi_desc_registration *) + desc)->format_identifier); + pr_alert("%s: descriptor type %d found\n", + __func__, + desc->type); + pr_alert("%s: change 'additional_info' endianness before calling\n", + __func__); + break; + default: + pr_err("%s: descriptor type %d not implemented, skipping\n", + __func__, + desc->type); + break; + } +} + +static void vidtv_psi_desc_to_cpu(struct vidtv_psi_desc *desc) +{ + /* + * Convert descriptor endianness to native on a field-by-field basis + * where applicable + */ + + switch (desc->type) { + /* nothing do do */ + case SERVICE_DESCRIPTOR: + break; + case REGISTRATION_DESCRIPTOR: + be32_to_cpus(&((struct vidtv_psi_desc_registration *) + desc)->format_identifier); + pr_alert("%s: descriptor type %d found\n", + __func__, + desc->type); + pr_alert("%s: change 'additional_info' endianness before calling\n", + __func__); + break; + default: + pr_err("%s: descriptor type %d not implemented, skipping\n", + __func__, + desc->type); + break; + } +} + +static u32 vidtv_psi_desc_write_into(struct desc_write_args args) +{ + /* the number of bytes written by this function */ + u32 nbytes = 0; + struct psi_write_args psi_args = {0}; + + psi_args.dest_buf = args.dest_buf; + psi_args.from = args.desc; + + psi_args.len = sizeof_field(struct vidtv_psi_desc, type) + + sizeof_field(struct vidtv_psi_desc, length); + + psi_args.dest_offset = args.dest_offset; + psi_args.pid = args.pid; + psi_args.new_psi_section = false; + psi_args.continuity_counter = args.continuity_counter; + psi_args.is_crc = false; + psi_args.dest_buf_sz = args.dest_buf_sz; + + vidtv_psi_desc_to_be(args.desc); + + nbytes += vidtv_psi_ts_psi_write_into(psi_args); + + /* move 'from' pointer to point to u8 data[] */ + psi_args.from = args.desc + + sizeof_field(struct vidtv_psi_desc, type) + + sizeof_field(struct vidtv_psi_desc, length) + + sizeof(struct vidtv_psi_desc *); + + psi_args.len = args.desc->length; + psi_args.dest_offset = args.dest_offset + nbytes; + + nbytes += vidtv_psi_ts_psi_write_into(psi_args); + + vidtv_psi_desc_to_cpu(args.desc); + + return nbytes; +} + +static u32 +vidtv_psi_table_header_write_into(struct header_write_args args) +{ + /* the number of bytes written by this function */ + u32 nbytes = 0; + struct psi_write_args psi_args = {0}; + + psi_args.dest_buf = args.dest_buf; + psi_args.from = args.h; + psi_args.len = sizeof(struct vidtv_psi_table_header); + psi_args.dest_offset = args.dest_offset; + psi_args.pid = args.pid; + psi_args.new_psi_section = true; + psi_args.continuity_counter = args.continuity_counter; + psi_args.is_crc = false; + psi_args.dest_buf_sz = args.dest_buf_sz; + + cpu_to_be16s(&args.h->bitfield); + cpu_to_be16s(&args.h->id); + + nbytes += vidtv_psi_ts_psi_write_into(psi_args); + + be16_to_cpus(&args.h->bitfield); + be16_to_cpus(&args.h->id); + + return nbytes; +} + +void +vidtv_psi_pat_table_comp_sec_len(struct vidtv_psi_table_pat *pat) +{ + /* see ISO/IEC 13818-1 : 2000 p.43 */ + u16 length = 0; + u32 i; + + /* from immediately after 'section_length' until 'last_section_number'*/ + length += PAT_LEN_UNTIL_LAST_SECTION_NUMBER; + + /* do not count the pointer */ + for (i = 0; i < pat->programs; ++i) + length += sizeof(struct vidtv_psi_table_pat_program) - + sizeof(struct vidtv_psi_table_pat_program *); + + length += CRC_SIZE_IN_BYTES; + + WARN_ON(length > MAX_SECTION_LEN); + pat->header.section_length = length; +} + +void vidtv_psi_pmt_table_comp_sec_len(struct vidtv_psi_table_pmt *pmt) +{ + /* see ISO/IEC 13818-1 : 2000 p.46 */ + u16 length = 0; + struct vidtv_psi_table_pmt_stream *s = pmt->stream; + + /* from immediately after 'section_length' until 'program_info_length'*/ + length += PMT_LEN_UNTIL_PROGRAM_INFO_LENGTH; + + pmt->desc_length = vidtv_psi_desc_comp_len(pmt->descriptor); + length += pmt->desc_length; + + while (s) { + /* skip both pointers at the end */ + length += sizeof(struct vidtv_psi_table_pmt_stream) - + sizeof(struct vidtv_psi_desc *) - + sizeof(struct vidtv_psi_table_pmt_stream *); + + s->desc_length = vidtv_psi_desc_comp_len(s->descriptor); + length += s->desc_length; + + s = s->next; + } + + length += CRC_SIZE_IN_BYTES; + + WARN_ON(length > MAX_SECTION_LEN); + pmt->header.section_length = length; +} + +void vidtv_psi_sdt_table_comp_sec_len(struct vidtv_psi_table_sdt *sdt) +{ + /* see ETSI EN 300 468 V 1.10.1 p.24 */ + u16 length = 0; + struct vidtv_psi_table_sdt_service *s = sdt->service; + + /* + * from immediately after 'section_length' until + * 'reserved_for_future_use' + */ + length += SDT_LEN_UNTIL_RESERVED_FOR_FUTURE_USE; + + while (s) { + /* skip both pointers at the end */ + length += sizeof(struct vidtv_psi_table_sdt_service) - + sizeof(struct vidtv_psi_desc *) - + sizeof(struct vidtv_psi_table_sdt_service *); + + s->desc_length = vidtv_psi_desc_comp_len(s->descriptor); + length += s->desc_length; + + s = s->next; + } + + length += CRC_SIZE_IN_BYTES; + + WARN_ON(length > MAX_SECTION_LEN); + sdt->header.section_length = length; +} + +struct vidtv_psi_table_pat_program* +vidtv_psi_pat_program_init(struct vidtv_psi_table_pat_program *head, + u16 service_id, + u16 pid) +{ + /* + * if 'head' is attached to a table, caller should recompute + * the section length afterwards at some point + */ + struct vidtv_psi_table_pat_program *program; + + program = kzalloc(sizeof(*program), GFP_KERNEL); + + program->service_id = service_id; + /* pid for the PMT section in the TS */ + program->pid = pid; + program->next = NULL; + program->reserved = 0x7; + + if (head) { + while (head->next) + head = head->next; + + head->next = program; + } + + return program; +} + +void +vidtv_psi_pat_program_destroy(struct vidtv_psi_table_pat_program *p) +{ + struct vidtv_psi_table_pat_program *curr = p; + struct vidtv_psi_table_pat_program *tmp = NULL; + + while (curr) { + tmp = curr; + curr = curr->next; + kfree(tmp); + } +} + +void +vidtv_psi_pat_program_assign(struct vidtv_psi_table_pat *pat, + struct vidtv_psi_table_pat_program *p) +{ + /* This function transfers ownership of p to the table */ + + u16 program_count = 0; + struct vidtv_psi_table_pat_program *program = p; + struct vidtv_psi_table_pat_program *temp = pat->program; + + while (program) { + ++program_count; + program = program->next; + } + + pat->programs = program_count; + pat->program = p; + + /* Recompute section length */ + vidtv_psi_pat_table_comp_sec_len(pat); + + /* reassign if the new size is too big */ + if (pat->header.section_length > MAX_SECTION_LEN) + vidtv_psi_pat_program_assign(pat, temp); + else + vidtv_psi_pat_program_destroy(temp); +} + +void vidtv_psi_pat_table_init(struct vidtv_psi_table_pat *pat, + bool update_version_num, + u16 transport_stream_id) +{ + static u8 pat_version; + + pat->header.table_id = 0x0; + pat->header.syntax = 0x1; + pat->header.zero = 0x0; + pat->header.one = 0x03; + + /* transport stream ID, at will */ + pat->header.id = transport_stream_id; + pat->header.current_next = 0x1; + + /* ETSI 300 468: indicates changes in the TS described by this table*/ + if (update_version_num) + ++pat_version; + + pat->header.version = pat_version; + + pat->header.one2 = 0x03; + pat->header.section_id = 0x0; + pat->header.last_section = 0x0; + + pat->programs = 0; + + vidtv_psi_pat_table_comp_sec_len(pat); +} + +u32 vidtv_psi_pat_write_into(char *buf, + u32 offset, + struct vidtv_psi_table_pat *pat, + u32 buf_sz, + u8 *continuity_counter) +{ + /* the number of bytes written by this function */ + u32 nbytes = 0; + const u16 pat_pid = VIDTV_PAT_PID; + + struct vidtv_psi_table_pat_program *p = pat->program; + struct header_write_args h_args = {0}; + struct psi_write_args args = {0}; + struct crc32_write_args c_args = {0}; + + vidtv_psi_pat_table_comp_sec_len(pat); + + h_args.dest_buf = buf; + h_args.dest_offset = offset; + h_args.h = &pat->header; + h_args.pid = pat_pid; + h_args.continuity_counter = continuity_counter; + h_args.dest_buf_sz = buf_sz; + + nbytes += vidtv_psi_table_header_write_into(h_args); + + /* note that the field 'u16 programs' is not really part of the PAT */ + + args.dest_buf = buf; + args.pid = pat_pid; + args.new_psi_section = false; + args.continuity_counter = continuity_counter; + args.is_crc = false; + args.dest_buf_sz = buf_sz; + + while (p) { + /* copy the PAT programs */ + cpu_to_be16s(&p->service_id); + cpu_to_be16s(&p->bitfield); + + args.from = p; + /* skip the pointer */ + args.len = sizeof(*p) - + sizeof(struct vidtv_psi_table_pat_program *); + args.dest_offset = offset + nbytes; + + nbytes += vidtv_psi_ts_psi_write_into(args); + + be16_to_cpus(&p->service_id); + be16_to_cpus(&p->bitfield); + + p = p->next; + } + + c_args.dest_buf = buf; + c_args.dest_offset = offset + nbytes; + c_args.pid = pat_pid; + c_args.continuity_counter = continuity_counter; + c_args.dest_buf_sz = buf_sz; + + nbytes += table_section_crc32_write_into(c_args); + + return nbytes; +} + +void +vidtv_psi_pat_table_destroy(struct vidtv_psi_table_pat *p) +{ + vidtv_psi_pat_program_destroy(p->program); +} + +struct vidtv_psi_table_pmt_stream* +vidtv_psi_pmt_stream_init(struct vidtv_psi_table_pmt_stream *head, + enum vidtv_psi_stream_types stream_type, + u16 es_pid) +{ + struct vidtv_psi_table_pmt_stream *stream; + + stream = kzalloc(sizeof(*stream), GFP_KERNEL); + + stream->type = stream_type; + stream->elementary_pid = es_pid; + stream->reserved = 0x07; + + stream->desc_length = vidtv_psi_desc_comp_len(stream->descriptor); + + stream->zero = 0x0; + stream->reserved2 = 0x0f; + + if (head) { + while (head->next) + head = head->next; + + head->next = stream; + } + + return stream; +} + +void vidtv_psi_pmt_stream_destroy(struct vidtv_psi_table_pmt_stream *s) +{ + struct vidtv_psi_table_pmt_stream *curr_stream = s; + struct vidtv_psi_table_pmt_stream *tmp_stream = NULL; + + while (curr_stream) { + tmp_stream = curr_stream; + curr_stream = curr_stream->next; + kfree(tmp_stream); + } +} + +void vidtv_psi_pmt_stream_assign(struct vidtv_psi_table_pmt *pmt, + struct vidtv_psi_table_pmt_stream *s) +{ + /* This function transfers ownership of s to the table */ + struct vidtv_psi_table_pmt_stream *stream = s; + struct vidtv_psi_desc *desc = s->descriptor; + struct vidtv_psi_table_pmt_stream *temp = pmt->stream; + + while (stream) + stream = stream->next; + + while (desc) + desc = desc->next; + + pmt->stream = s; + /* Recompute section length */ + vidtv_psi_pmt_table_comp_sec_len(pmt); + + /* reassign if the new size is too big */ + if (pmt->header.section_length > MAX_SECTION_LEN) + vidtv_psi_pmt_stream_assign(pmt, temp); + else + vidtv_psi_pmt_stream_destroy(temp); +} + +u16 vidtv_psi_pmt_get_pid(struct vidtv_psi_table_pmt *section, + struct vidtv_psi_table_pat *pat) +{ + struct vidtv_psi_table_pat_program *program = pat->program; + + /* + * service_id is the same as program_number in the + * corresponding program_map_section + * see ETSI EN 300 468 v1.15.1 p. 24 + */ + while (program) { + if (program->service_id == section->header.id) + return pat->program->pid; + + program = program->next; + } + + return TS_LAST_VALID_PID + 1; /* not found */ +} + +void vidtv_psi_pmt_table_init(struct vidtv_psi_table_pmt *pmt, + bool update_version_num, + u16 program_number, + u16 pcr_pid) +{ + static u8 pmt_version; + + pmt->header.table_id = 0x2; + pmt->header.syntax = 0x1; + pmt->header.zero = 0x0; + pmt->header.one = 0x3; + + pmt->header.id = program_number; + pmt->header.current_next = 0x1; + + /* ETSI 300 468: indicates changes in the TS described by this table*/ + if (update_version_num) + ++pmt_version; + + pmt->header.version = pmt_version; + + pmt->header.one2 = 0x3; + pmt->header.section_id = 0; + pmt->header.last_section = 0; + + pmt->pcr_pid = (pcr_pid) ? pcr_pid : 0x1fff; + pmt->reserved2 = 0x03; + + pmt->reserved3 = 0x0f; + pmt->zero3 = 0x0; + + pmt->desc_length = vidtv_psi_desc_comp_len(pmt->descriptor); + + vidtv_psi_pmt_table_comp_sec_len(pmt); +} + +u32 vidtv_psi_pmt_write_into(char *buf, + u32 offset, + struct vidtv_psi_table_pmt *pmt, + u16 pid, + u32 buf_sz, + u8 *continuity_counter) +{ + /* the number of bytes written by this function */ + u32 nbytes = 0; + struct vidtv_psi_desc *table_descriptor = pmt->descriptor; + struct vidtv_psi_table_pmt_stream *stream = pmt->stream; + struct vidtv_psi_desc *stream_descriptor = (stream) ? + pmt->stream->descriptor : + NULL; + + struct header_write_args h_args = {0}; + struct psi_write_args args = {0}; + struct desc_write_args d_args = {0}; + struct crc32_write_args c_args = {0}; + + vidtv_psi_pmt_table_comp_sec_len(pmt); + + h_args.dest_buf = buf; + h_args.dest_offset = offset; + h_args.h = &pmt->header; + h_args.pid = pid; + h_args.continuity_counter = continuity_counter; + h_args.dest_buf_sz = buf_sz; + + nbytes += vidtv_psi_table_header_write_into(h_args); + + /* write the two bitfields */ + cpu_to_be16s(&pmt->bitfield); + cpu_to_be16s(&pmt->bitfield2); + + args.dest_buf = buf; + args.from = pmt + sizeof(struct vidtv_psi_table_header); + args.len = sizeof_field(struct vidtv_psi_table_pmt, bitfield) + + sizeof_field(struct vidtv_psi_table_pmt, bitfield2); + args.dest_offset = offset + nbytes; + args.pid = pid; + args.new_psi_section = false; + args.continuity_counter = continuity_counter; + args.is_crc = false; + args.dest_buf_sz = buf_sz; + + nbytes += vidtv_psi_ts_psi_write_into(args); + + be16_to_cpus(&pmt->bitfield); + be16_to_cpus(&pmt->bitfield2); + + while (table_descriptor) { + /* write the descriptors, if any */ + d_args.dest_buf = buf; + d_args.dest_offset = offset + nbytes; + d_args.desc = table_descriptor; + d_args.pid = pid; + d_args.continuity_counter = continuity_counter; + d_args.dest_buf_sz = buf_sz; + + vidtv_psi_desc_to_be(d_args.desc); + nbytes += vidtv_psi_desc_write_into(d_args); + vidtv_psi_desc_to_cpu(d_args.desc); + + table_descriptor = table_descriptor->next; + } + + while (stream) { + /* write the streams, if any */ + args.from = stream; + args.len = sizeof_field(struct vidtv_psi_table_pmt_stream, + type) + + sizeof_field(struct vidtv_psi_table_pmt_stream, + bitfield) + + sizeof_field(struct vidtv_psi_table_pmt_stream, + bitfield2); + args.dest_offset = offset + nbytes; + + cpu_to_be16s(&stream->bitfield); + cpu_to_be16s(&stream->bitfield2); + + nbytes += vidtv_psi_ts_psi_write_into(args); + + be16_to_cpus(&stream->bitfield); + be16_to_cpus(&stream->bitfield2); + + while (stream_descriptor) { + /* write the stream descriptors, if any */ + d_args.desc = stream_descriptor; + d_args.dest_offset = offset + nbytes; + + vidtv_psi_desc_to_be(d_args.desc); + + nbytes += vidtv_psi_desc_write_into(d_args); + + vidtv_psi_desc_to_cpu(d_args.desc); + + stream_descriptor = stream_descriptor->next; + } + + stream = stream->next; + } + + c_args.dest_buf = buf; + c_args.dest_offset = offset + nbytes; + c_args.pid = pid; + c_args.continuity_counter = continuity_counter; + c_args.dest_buf_sz = buf_sz; + + nbytes += table_section_crc32_write_into(c_args); + + return nbytes; +} + +void vidtv_psi_pmt_table_destroy(struct vidtv_psi_table_pmt *pmt) +{ + struct vidtv_psi_desc *curr_desc = pmt->descriptor; + struct vidtv_psi_desc *tmp_desc = NULL; + + while (curr_desc) { + tmp_desc = curr_desc; + curr_desc = curr_desc->next; + vidtv_psi_desc_destroy(tmp_desc); + kfree(tmp_desc); + } + + vidtv_psi_pmt_stream_destroy(pmt->stream); +} + +void vidtv_psi_sdt_table_init(struct vidtv_psi_table_sdt *sdt, + bool update_version_num, + u16 transport_stream_id) +{ + static u8 sdt_version; + + sdt->header.table_id = 0x42; + + sdt->header.one = 0x3; + sdt->header.zero = 0x1; + /* + * The PAT, PMT, and CAT all set this to 0. + * Other tables set this to 1. + */ + sdt->header.syntax = 0x1; + + /* + * This is a 16-bit field which serves as a label for identification + * of the TS, about which the SDT informs, from any other multiplex + * within the delivery system. + */ + sdt->header.id = transport_stream_id; + sdt->header.current_next = 0x1; + + /* ETSI 300 468: indicates changes in the TS described by this table*/ + if (update_version_num) + ++sdt_version; + + sdt->header.version = sdt_version; + + sdt->header.one2 = 0x3; + sdt->header.section_id = 0; + sdt->header.last_section = 0; + + sdt->network_id = transport_stream_id; + sdt->reserved = 0xff; + + vidtv_psi_sdt_table_comp_sec_len(sdt); +} + +u32 vidtv_psi_sdt_write_into(char *buf, + u32 offset, + struct vidtv_psi_table_sdt *sdt, + u32 buf_sz, + u8 *continuity_counter) +{ + u32 nbytes = 0; /* the number of bytes written */ + u16 sdt_pid = VIDTV_SDT_PID; /* see ETSI EN 300 468 v1.15.1 p. 11 */ + + struct vidtv_psi_table_sdt_service *service = sdt->service; + struct vidtv_psi_desc *service_desc = (sdt->service) ? + sdt->service->descriptor : + NULL; + + struct header_write_args h_args = {0}; + struct psi_write_args args = {0}; + struct desc_write_args d_args = {0}; + struct crc32_write_args c_args = {0}; + + vidtv_psi_sdt_table_comp_sec_len(sdt); + + h_args.dest_buf = buf; + h_args.dest_offset = offset; + h_args.h = &sdt->header; + h_args.pid = sdt_pid; + h_args.continuity_counter = continuity_counter; + h_args.dest_buf_sz = buf_sz; + + nbytes += vidtv_psi_table_header_write_into(h_args); + + args.dest_buf = buf; + args.from = sdt + sizeof(struct vidtv_psi_table_header); + + args.len = sizeof_field(struct vidtv_psi_table_sdt, network_id) + + sizeof_field(struct vidtv_psi_table_sdt, reserved); + + args.dest_offset = offset + nbytes; + args.pid = sdt_pid; + args.new_psi_section = false; + args.continuity_counter = continuity_counter; + args.is_crc = false; + args.dest_buf_sz = buf_sz; + + /* copy u16 network_id + u8 reserved)*/ + cpu_to_be16s(&sdt->network_id); + + nbytes += vidtv_psi_ts_psi_write_into(args); + + be16_to_cpus(&sdt->network_id); + + while (service) { + /* copy the services, if any */ + args.from = service; + /* skip both pointers at the end */ + args.len = sizeof(struct vidtv_psi_table_sdt_service) - + sizeof(struct vidtv_psi_desc *) - + sizeof(struct vidtv_psi_table_sdt_service *); + args.dest_offset = offset + nbytes; + + cpu_to_be16s(&service->service_id); + cpu_to_be16s(&service->bitfield); + + nbytes += vidtv_psi_ts_psi_write_into(args); + + be16_to_cpus(&service->service_id); + be16_to_cpus(&service->bitfield); + + while (service_desc) { + /* copy the service descriptors, if any */ + d_args.dest_buf = buf; + d_args.dest_offset = offset + nbytes; + d_args.desc = service_desc; + d_args.pid = sdt_pid; + d_args.continuity_counter = continuity_counter; + d_args.dest_buf_sz = buf_sz; + + vidtv_psi_desc_to_be(d_args.desc); + + nbytes += vidtv_psi_desc_write_into(d_args); + + vidtv_psi_desc_to_cpu(d_args.desc); + + service_desc = service_desc->next; + } + + service = service->next; + } + + c_args.dest_buf = buf; + c_args.dest_offset = offset + nbytes; + c_args.pid = sdt_pid; + c_args.continuity_counter = continuity_counter; + c_args.dest_buf_sz = buf_sz; + + nbytes += table_section_crc32_write_into(c_args); + + return nbytes; +} + +void vidtv_psi_sdt_table_destroy(struct vidtv_psi_table_sdt *sdt) +{ + struct vidtv_psi_table_sdt_service *curr_service = sdt->service; + struct vidtv_psi_table_sdt_service *tmp_service = NULL; + struct vidtv_psi_desc *curr_desc = (sdt->service) ? + sdt->service->descriptor : NULL; + struct vidtv_psi_desc *tmp_desc = NULL; + + while (curr_service) { + curr_desc = curr_service->descriptor; + + while (curr_desc) { + /* clear all descriptors for the service */ + tmp_desc = curr_desc; + curr_desc = curr_desc->next; + vidtv_psi_desc_destroy(tmp_desc); + kfree(tmp_desc); + } + + /* then clear the current service */ + tmp_service = curr_service; + curr_service = curr_service->next; + kfree(tmp_service); + } +} + +struct vidtv_psi_table_sdt_service +*vidtv_psi_sdt_service_init(struct vidtv_psi_table_sdt_service *head, + u16 service_id) +{ + /* + * if 'head' is attached to a table, caller should recompute + * the section length afterwards at some point + */ + struct vidtv_psi_table_sdt_service *service; + + service = kzalloc(sizeof(*service), GFP_KERNEL); + + /* + * ETSI 300 468: this is a 16bit field which serves as a label to + * identify this service from any other service within the TS. + * The service id is the same as the program number in the + * corresponding program_map_section + */ + service->service_id = service_id; + service->EIT_schedule = 0x0; /* TODO */ + service->EIT_present_following = 0x0; /* TODO */ + service->reserved = 0x3f; /* all bits on */ + service->free_CA_mode = 0x0; /* not scrambled */ + service->running_status = RUNNING; + + if (head) { + while (head->next) + head = head->next; + + head->next = service; + } + + return service; +} + +void +vidtv_psi_sdt_service_destroy(struct vidtv_psi_table_sdt_service *service) +{ + struct vidtv_psi_table_sdt_service *curr = service; + struct vidtv_psi_table_sdt_service *tmp = NULL; + + while (curr) { + tmp = curr; + curr = curr->next; + kfree(tmp); + } +} + +void +vidtv_psi_sdt_service_assign(struct vidtv_psi_table_sdt *sdt, + struct vidtv_psi_table_sdt_service *service) +{ + struct vidtv_psi_table_sdt_service *temp = sdt->service; + + sdt->service = service; + + /* recompute section length */ + vidtv_psi_sdt_table_comp_sec_len(sdt); + + /* reassign if the new size is too big */ + if (sdt->header.section_length > MAX_SECTION_LEN) + vidtv_psi_sdt_service_assign(sdt, temp); + else + vidtv_psi_sdt_service_destroy(temp); +} + +void +vidtv_psi_pmt_create_sec_for_each_pat_entry(struct vidtv_psi_table_pat *pat, + struct vidtv_psi_table_pmt sec[]) + +{ + /* + * PMTs contain information about programs. For each program, + * there is one PMT section. This function will create a section + * for each program found in the PAT + */ + struct vidtv_psi_table_pat_program *program = pat->program; + u32 i = 0; + + while (program) { + vidtv_psi_pmt_table_init(&sec[i], + false, + sec[i].header.id, + 0); + + ++i; + program = program->next; + } +} diff --git a/drivers/media/test-drivers/vidtv/vidtv_psi.h b/drivers/media/test-drivers/vidtv/vidtv_psi.h new file mode 100644 index 0000000000000..c5c8c143f0e4a --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_psi.h @@ -0,0 +1,357 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * This file contains the logic to work with MPEG Program-Specific Information. + * These are defined both in ISO/IEC 13818-1 (systems) and ETSI EN 300 468. + * PSI is carried in the form of table structures, and although each table might + * technically be broken into one or more sections, we do not do this here, + * hence 'table' and 'section' are interchangeable for us. + * + * This code currently supports three tables: PAT, PMT and SDT. These are the + * bare minimum to get userspace to recognize our MPEG transport stream. It can + * be extended to support more PSI tables in the future. + * + * A note on endianness: MPEG layout is big-endian, therefore: + * - All fields spanning more than a byte must undergo 'cpu_to_beXX()' before + * serialization. These convertions are done in the *_write_into() functions. + * + * - All byte sized bitfields must have their ordering reversed if + * __LITTLE_ENDIAN_BITFIELD is defined. + * + * Written by: Daniel W. S. Almeida + */ + +#ifndef VIDTV_PSI_H +#define VIDTV_PSI_H + +#include +#include + +/* + * all section lengths start immediately after the 'section_length' field + * see ISO/IEC 13818-1 : 2000 and ETSI EN 300 468 V 1.10.1 for + * reference + */ +#define PAT_LEN_UNTIL_LAST_SECTION_NUMBER 5 +#define PMT_LEN_UNTIL_PROGRAM_INFO_LENGTH 9 +#define SDT_LEN_UNTIL_RESERVED_FOR_FUTURE_USE 8 +#define MAX_SECTION_LEN 1021 +#define VIDTV_PAT_PID 0 +#define VIDTV_SDT_PID 0x0011 + +enum vidtv_psi_descriptors { + REGISTRATION_DESCRIPTOR = 0x05, + SERVICE_DESCRIPTOR = 0x48, +}; + +enum vidtv_psi_stream_types { + /* see ISO/IEC 13818-1 2000 p. 48 */ + STREAM_PRIVATE_DATA = 0x06, +}; + +struct vidtv_psi_desc { + u8 type; + u8 length; + struct vidtv_psi_desc *next; + u8 data[]; +} __packed; + +struct vidtv_psi_desc_service { + u8 type; + u8 length; + struct vidtv_psi_desc *next; + + u8 service_type; + char *name; + char *name_emph; + char *provider; + char *provider_emph; +} __packed; + +struct vidtv_psi_desc_registration { + u8 type; + u8 length; + struct vidtv_psi_desc *next; + + /* + * The format_identifier is a 32-bit value obtained from a Registration + * Authority as designated by ISO/IEC JTC 1/SC 29. + */ + u32 format_identifier; + /* + * The meaning of additional_identification_info bytes, if any, are + * defined by the assignee of that format_identifier, and once defined + * they shall not change. + */ + u8 additional_identification_info[]; +} __packed; + +struct vidtv_psi_table_header { + u8 table_id; + union { + u16 bitfield; + struct { + u8 syntax:1; + u8 zero:1; + u8 one:2; + u16 section_length:12; + } __packed; + } __packed; + + u16 id; /* TS ID */ +#if defined(__LITTLE_ENDIAN_BITFIELD) + u8 current_next:1; + u8 version:5; + u8 one2:2; +#elif defined(__BIG_ENDIAN_BITFIELD) + u8 one2:2; + u8 version:5; + u8 current_next:1; +#else +#error "Please fix " +#endif + u8 section_id; /* section_number */ + u8 last_section; /* last_section_number */ +} __packed; + +struct vidtv_psi_table_pat_program { + u16 service_id; + union { + u16 bitfield; + struct { + u8 reserved:3; + u16 pid:13; + } __packed; + } __packed; + struct vidtv_psi_table_pat_program *next; +} __packed; + +struct vidtv_psi_table_pat { + struct vidtv_psi_table_header header; + u16 programs; + struct vidtv_psi_table_pat_program *program; +} __packed; + +struct vidtv_psi_table_sdt_service { + u16 service_id; +#if defined(__LITTLE_ENDIAN_BITFIELD) + u8 EIT_present_following:1; + u8 EIT_schedule:1; + u8 reserved:6; +#elif defined(__BIG_ENDIAN_BITFIELD) + u8 reserved:6; + u8 EIT_schedule:1; + u8 EIT_present_following:1; +#else +#error "Please fix " +#endif + union { + u16 bitfield; + struct { + u16 running_status:3; + u16 free_CA_mode:1; + u16 desc_length:12; + } __packed; + } __packed; + struct vidtv_psi_desc *descriptor; + struct vidtv_psi_table_sdt_service *next; +} __packed; + +struct vidtv_psi_table_sdt { + struct vidtv_psi_table_header header; + u16 network_id; /* original_network_id */ + u8 reserved; + struct vidtv_psi_table_sdt_service *service; +} __packed; + +enum service_running_status { + RUNNING, +}; + +enum service_type { + /* see ETSI EN 300 468 v1.15.1 p. 77 */ + DIGITAL_TELEVISION_SERVICE = 0x1, +}; + +struct vidtv_psi_table_pmt_stream { + u8 type; + union { + u16 bitfield; + struct { + u16 reserved:3; + u16 elementary_pid:13; + } __packed; + } __packed; + union { + u16 bitfield2; + struct { + u16 reserved2:4; + u16 zero:2; + u16 desc_length:10; + } __packed; + } __packed; + struct vidtv_psi_desc *descriptor; + struct vidtv_psi_table_pmt_stream *next; +} __packed; + +struct vidtv_psi_table_pmt { + struct vidtv_psi_table_header header; + union { + u16 bitfield; + struct { + u16 reserved2:3; + u16 pcr_pid:13; + } __packed; + } __packed; + + union { + u16 bitfield2; + struct { + u16 reserved3:4; + u16 zero3:2; + u16 desc_length:10; /* program_info_length */ + } __packed; + } __packed; + struct vidtv_psi_desc *descriptor; + struct vidtv_psi_table_pmt_stream *stream; +} __packed; + +struct psi_write_args { + void *dest_buf; /* the buffer to write into */ + void *from; + size_t len; /* how much to write */ + u32 dest_offset; /* where to start writing in the buffer */ + u16 pid; /* TS packet ID */ + bool new_psi_section; /* set when starting a table section */ + u8 *continuity_counter; /* TS: incremented on every new packet */ + bool is_crc; /* set when writing the CRC at the end */ + u32 dest_buf_sz; /* protect against overflow if not zero */ +}; + +struct desc_write_args { + void *dest_buf; + u32 dest_offset; + struct vidtv_psi_desc *desc; + u16 pid; + u8 *continuity_counter; + u32 dest_buf_sz; +}; + +struct crc32_write_args { + void *dest_buf; + u32 dest_offset; + u16 pid; + u8 *continuity_counter; + u32 dest_buf_sz; +}; + +struct header_write_args { + void *dest_buf; + u32 dest_offset; + struct vidtv_psi_table_header *h; + u16 pid; + u8 *continuity_counter; + u32 dest_buf_sz; +}; + +struct vidtv_psi_desc *vidtv_psi_desc_init(struct vidtv_psi_desc *head, + u8 type, + u8 length); + +void vidtv_psi_pat_table_init(struct vidtv_psi_table_pat *pat, + bool update_version_num, + u16 transport_stream_id); + +struct vidtv_psi_table_pat_program* +vidtv_psi_pat_program_init(struct vidtv_psi_table_pat_program *head, + u16 service_id, + u16 pid); + +struct vidtv_psi_table_pmt_stream* +vidtv_psi_pmt_stream_init(struct vidtv_psi_table_pmt_stream *head, + enum vidtv_psi_stream_types stream_type, + u16 es_pid); + +void vidtv_psi_pmt_table_init(struct vidtv_psi_table_pmt *pmt, + bool update_version_num, + u16 program_number, + u16 pcr_pid); + +void +vidtv_psi_sdt_table_init(struct vidtv_psi_table_sdt *sdt, + bool update_version_num, + u16 transport_stream_id); + +struct vidtv_psi_table_sdt_service* +vidtv_psi_sdt_service_init(struct vidtv_psi_table_sdt_service *head, + u16 service_id); + +void +vidtv_psi_desc_destroy(struct vidtv_psi_desc *desc); + +void +vidtv_psi_pat_program_destroy(struct vidtv_psi_table_pat_program *p); + +void +vidtv_psi_pat_table_destroy(struct vidtv_psi_table_pat *p); + +void +vidtv_psi_pmt_stream_destroy(struct vidtv_psi_table_pmt_stream *s); + +void +vidtv_psi_pmt_table_destroy(struct vidtv_psi_table_pmt *pmt); + +void +vidtv_psi_sdt_table_destroy(struct vidtv_psi_table_sdt *sdt); + +void +vidtv_psi_sdt_service_destroy(struct vidtv_psi_table_sdt_service *service); + +void +vidtv_psi_desc_destroy(struct vidtv_psi_desc *desc); + +void +vidtv_psi_pat_program_destroy(struct vidtv_psi_table_pat_program *p); + +void +vidtv_psi_sdt_service_assign(struct vidtv_psi_table_sdt *sdt, + struct vidtv_psi_table_sdt_service *service); + +void vidtv_psi_desc_assign(struct vidtv_psi_desc **to, + struct vidtv_psi_desc *desc); + +void vidtv_psi_pat_program_assign(struct vidtv_psi_table_pat *pat, + struct vidtv_psi_table_pat_program *p); + +void vidtv_psi_pmt_stream_assign(struct vidtv_psi_table_pmt *pmt, + struct vidtv_psi_table_pmt_stream *s); +void +vidtv_psi_pmt_create_sec_for_each_pat_entry(struct vidtv_psi_table_pat *pat, + struct vidtv_psi_table_pmt *sec); + +u16 vidtv_psi_pmt_get_pid(struct vidtv_psi_table_pmt *section, + struct vidtv_psi_table_pat *pat); + +void vidtv_psi_pat_table_comp_sec_len(struct vidtv_psi_table_pat *pat); +void vidtv_psi_pmt_table_comp_sec_len(struct vidtv_psi_table_pmt *pmt); +void vidtv_psi_sdt_table_comp_sec_len(struct vidtv_psi_table_sdt *sdt); + +u32 vidtv_psi_pat_write_into(char *buf, + u32 offset, + struct vidtv_psi_table_pat *pat, + u32 buf_sz, + u8 *continuity_counter); + +u32 vidtv_psi_sdt_write_into(char *buf, + u32 offset, + struct vidtv_psi_table_sdt *sdt, + u32 buf_sz, + u8 *continuity_counter); + +u32 vidtv_psi_pmt_write_into(char *buf, + u32 offset, + struct vidtv_psi_table_pmt *pmt, + u16 pid, + u32 buf_sz, + u8 *continuity_counter); + +#endif // VIDTV_PSI_H From patchwork Sat May 2 03:22:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Almeida X-Patchwork-Id: 63512 Received: from vger.kernel.org ([23.128.96.18]) by www.linuxtv.org with esmtp (Exim 4.92) (envelope-from ) id 1jUih5-007NX3-87; Sat, 02 May 2020 03:20:00 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727943AbgEBDXJ (ORCPT + 1 other); 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Fri, 01 May 2020 20:23:06 -0700 (PDT) From: "Daniel W. S. Almeida" X-Google-Original-From: Daniel W. S. Almeida To: mchehab+huawei@kernel.org, sean@mess.org, kstewart@linuxfoundation.org, allison@lohutok.net, tglx@linutronix.de Cc: "Daniel W. S. Almeida" , linux-media@vger.kernel.org, skhan@linuxfoundation.org, linux-kernel-mentees@lists.linuxfoundation.org, linux-kernel@vger.kernel.org Subject: [RFC, WIP, v4 09/11] media: vidtv: implement a PES packetizer Date: Sat, 2 May 2020 00:22:14 -0300 Message-Id: <20200502032216.197977-10-dwlsalmeida@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200502032216.197977-1-dwlsalmeida@gmail.com> References: <20200502032216.197977-1-dwlsalmeida@gmail.com> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-LSpam-Score: -2.5 (--) X-LSpam-Report: No, score=-2.5 required=5.0 tests=BAYES_00=-1.9,DKIM_SIGNED=0.1,DKIM_VALID=-0.1,DKIM_VALID_AU=-0.1,FREEMAIL_FORGED_FROMDOMAIN=0.001,FREEMAIL_FROM=0.001,HEADER_FROM_DIFFERENT_DOMAINS=0.5,MAILING_LIST_MULTI=-1 autolearn=ham autolearn_force=no From: "Daniel W. S. Almeida" Implement the PES logic to convert encoder data into MPEG TS packets. These TS packets can then be fed into a TS multiplexer and eventually into userspace. Signed-off-by: Daniel W. S. Almeida --- drivers/media/test-drivers/vidtv/Makefile | 2 +- .../media/test-drivers/vidtv/vidtv_common.c | 7 + .../media/test-drivers/vidtv/vidtv_common.h | 2 + drivers/media/test-drivers/vidtv/vidtv_pes.c | 429 ++++++++++++++++++ drivers/media/test-drivers/vidtv/vidtv_pes.h | 185 ++++++++ 5 files changed, 624 insertions(+), 1 deletion(-) create mode 100644 drivers/media/test-drivers/vidtv/vidtv_pes.c create mode 100644 drivers/media/test-drivers/vidtv/vidtv_pes.h diff --git a/drivers/media/test-drivers/vidtv/Makefile b/drivers/media/test-drivers/vidtv/Makefile index e4f744aa53136..e3a6540f50e87 100644 --- a/drivers/media/test-drivers/vidtv/Makefile +++ b/drivers/media/test-drivers/vidtv/Makefile @@ -1,6 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 vidtv_demod-objs := vidtv_common.o -vidtv_bridge-objs := vidtv_common.o vidtv_ts.o vidtv_psi.o +vidtv_bridge-objs := vidtv_common.o vidtv_ts.o vidtv_psi.o vidtv_pes.o obj-$(CONFIG_DVB_VIDTV) += vidtv_tuner.o vidtv_demod.o vidtv_bridge.o diff --git a/drivers/media/test-drivers/vidtv/vidtv_common.c b/drivers/media/test-drivers/vidtv/vidtv_common.c index 28f10630499a9..b1412b497e1e3 100644 --- a/drivers/media/test-drivers/vidtv/vidtv_common.c +++ b/drivers/media/test-drivers/vidtv/vidtv_common.c @@ -42,3 +42,10 @@ u32 vidtv_memset(void *to, memset(to, c, len); return len; } + +u64 vidtv_extract_bits(u64 value, u8 start_bit, u8 nbits) +{ + u64 mask = ((1 << nbits) - 1) << start_bit; + + return value & mask; +} diff --git a/drivers/media/test-drivers/vidtv/vidtv_common.h b/drivers/media/test-drivers/vidtv/vidtv_common.h index 64072c010dc66..3b68f95c5f6c8 100644 --- a/drivers/media/test-drivers/vidtv/vidtv_common.h +++ b/drivers/media/test-drivers/vidtv/vidtv_common.h @@ -25,4 +25,6 @@ u32 vidtv_memset(void *to, u32 offset, u32 buf_sz); +u64 vidtv_extract_bits(u64 value, u8 start_bit, u8 nbits); + #endif // VIDTV_COMMON_H diff --git a/drivers/media/test-drivers/vidtv/vidtv_pes.c b/drivers/media/test-drivers/vidtv/vidtv_pes.c new file mode 100644 index 0000000000000..bc631bac07778 --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_pes.c @@ -0,0 +1,429 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Vidtv serves as a reference DVB driver and helps validate the existing APIs + * in the media subsystem. It can also aid developers working on userspace + * applications. + * + * This file contains the logic to translate the ES data for one access unit + * from an encoder into MPEG TS packets. It does so by first encapsulating it + * with a PES header and then splitting it into TS packets. + * + * Written by Daniel W. S. Almeida + */ + +#include +#include +#include "vidtv_pes.h" +#include "vidtv_common.h" +#include "vidtv_ts.h" + +#define PRIVATE_STREAM_1_ID 0xbd /* private_stream_1. See SMPTE 302M-2007 p.6 */ +#define PES_HEADER_MAX_STUFFING_BYTES 32 +#define PES_TS_HEADER_MAX_STUFFING_BYTES 182 + +static u32 vidtv_pes_op_get_regular_len(bool send_pts, bool send_dts) +{ + u32 len = 0; + + /* the flags must always be sent */ + len += sizeof(struct vidtv_pes_optional); + + /* From all optionals, we might send these for now */ + if (send_pts && send_dts) + len += sizeof(struct vidtv_pes_optional_pts_dts); + else if (send_pts) + len += sizeof(struct vidtv_pes_optional_pts); + + return len; +} + +static u32 vidtv_pes_h_get_regular_len(bool send_pts, bool send_dts) +{ + /* PES header length notwithstanding stuffing bytes */ + u32 len = 0; + + len += sizeof(struct vidtv_mpeg_pes); + len += vidtv_pes_op_get_regular_len(send_pts, send_dts); + + return len; +} + +static u32 vidtv_pes_write_header_stuffing(struct vidtv_mpeg_pes *pes_h, + struct pes_header_write_args args) +{ + /* + * This is a fixed 8-bit value equal to '1111 1111' that can be inserted + * by the encoder, for example to meet the requirements of the channel. + * It is discarded by the decoder. No more than 32 stuffing bytes shall + * be present in one PES packet header. + */ + + WARN_ON(args.n_pes_h_s_bytes > PES_HEADER_MAX_STUFFING_BYTES); + + if (args.n_pes_h_s_bytes > PES_HEADER_MAX_STUFFING_BYTES) + args.n_pes_h_s_bytes = PES_HEADER_MAX_STUFFING_BYTES; + + /* gives the length of the remainder of the PES header in bytes */ + pes_h->length += args.n_pes_h_s_bytes; + + return vidtv_memset(args.dest_buf + args.dest_offset, + 0xff, + args.n_pes_h_s_bytes, + args.dest_offset, + args.dest_buf_sz); +} + +static u32 vidtv_pes_write_pts_dts(struct pes_header_write_args args) +{ + u32 nbytes = 0; /* the number of bytes written by this function */ + + struct vidtv_pes_optional_pts pts = {0}; + struct vidtv_pes_optional_pts_dts pts_dts = {0}; + void *op = NULL; + size_t op_sz = 0; + + if (!args.send_pts && args.send_dts) + return 0; + + /* see ISO/IEC 13818-1 : 2000 p. 32 */ + + if (args.send_pts && args.send_dts) { + cpu_to_be64s(&args.pts); + cpu_to_be64s(&args.dts); + pts_dts.three = 0x3; + + pts_dts.pts1 = vidtv_extract_bits(args.pts, 30, 3); + pts_dts.marker1 = 0x1; + pts_dts.pts2 = vidtv_extract_bits(args.pts, 15, 15); + pts_dts.marker2 = 0x1; + pts_dts.pts3 = vidtv_extract_bits(args.pts, 0, 15); + pts_dts.marker3 = 0x1; + + pts_dts.one = 0x1; + + pts_dts.dts1 = vidtv_extract_bits(args.dts, 30, 3); + pts_dts.marker1 = 0x1; + pts_dts.dts2 = vidtv_extract_bits(args.dts, 15, 15); + pts_dts.marker2 = 0x1; + pts_dts.dts3 = vidtv_extract_bits(args.dts, 0, 15); + pts_dts.marker3 = 0x1; + + be64_to_cpus(&args.pts); + be64_to_cpus(&args.dts); + + op = &pts_dts; + op_sz = sizeof(pts_dts); + + } else if (args.send_pts) { + cpu_to_be64s(&args.pts); + pts.two = 0x2; + pts.pts1 = vidtv_extract_bits(args.pts, 30, 3); + pts.marker1 = 0x1; + pts.pts2 = vidtv_extract_bits(args.pts, 15, 15); + pts.marker2 = 0x1; + pts.pts3 = vidtv_extract_bits(args.pts, 0, 15); + pts.marker3 = 0x1; + be64_to_cpus(&args.pts); + + op = &pts; + op_sz = sizeof(pts); + } + + /* copy PTS/DTS optional */ + nbytes += vidtv_memcpy(args.dest_buf + args.dest_offset + nbytes, + op, + op_sz, + args.dest_offset + nbytes, + args.dest_buf_sz); + + return nbytes; +} + +static u32 vidtv_pes_write_h(struct pes_header_write_args args) +{ + u32 nbytes = 0; /* the number of bytes written by this function */ + + struct vidtv_mpeg_pes pes_header = {0}; + struct vidtv_pes_optional pes_optional = {0}; + struct pes_header_write_args pts_dts_args = args; + + pes_header.packet_start_code_prefix = PES_START_CODE_PREFIX; + + pes_header.stream_id = (args.is_s302m_pkt) ? + PRIVATE_STREAM_1_ID : + args.stream_id; + + pes_header.length = vidtv_pes_op_get_regular_len(args.send_pts, + args.send_dts); + + pes_optional.two = 0x2; + + pes_optional.PTS_DTS = (args.send_pts && args.send_dts) ? + 0x3 : + (args.send_pts) ? + 0x2 : + 0x0; + + /* copy header */ + cpu_to_be32s(&pes_header.bitfield); + cpu_to_be16s(&pes_header.length); + + nbytes += vidtv_memcpy(args.dest_buf + args.dest_offset + nbytes, + &pes_header, + sizeof(pes_header), + args.dest_offset + nbytes, + args.dest_buf_sz); + + be32_to_cpus(&pes_header.bitfield); + be16_to_cpus(&pes_header.length); + + /* copy optional header */ + cpu_to_be16s(&pes_optional.bitfield); + + nbytes += vidtv_memcpy(args.dest_buf + args.dest_offset + nbytes, + &pes_optional, + sizeof(pes_optional), + args.dest_offset + nbytes, + args.dest_buf_sz); + + be16_to_cpus(&pes_optional.bitfield); + + pts_dts_args.dest_offset = args.dest_offset + nbytes; + nbytes += vidtv_pes_write_pts_dts(pts_dts_args); + + /* write any PES header stuffing */ + nbytes += vidtv_pes_write_header_stuffing(&pes_header, args); + + return nbytes; +} + +static u32 vidtv_pes_write_stuffing(struct vidtv_mpeg_ts *ts_h, + void *dest_buf, + u32 dest_offset, + u32 n_stuffing_bytes, + u32 buf_sz) +{ + /* + * For Transport Stream packets carrying PES packets, stuffing is + * needed when there is insufficient PES packet data to completely + * fill the Transport Stream packet payload bytes. Stuffing is + * accomplished by defining an adaptation field longer than the sum of + * the lengths of the data elements in it, so that the payload bytes + * remaining after the adaptation field exactly accommodates the + * available PES packet data. The extra space in the adaptation field + * is filled with stuffing bytes. + * + */ + + /* the number of bytes written by this function */ + u32 nbytes = 0; + struct vidtv_mpeg_ts_adaption ts_adap = {0}; + + if (!n_stuffing_bytes) + return nbytes; + + ts_h->adaptation_field = 1; + + WARN_ON(n_stuffing_bytes > PES_TS_HEADER_MAX_STUFFING_BYTES); + + if (n_stuffing_bytes > PES_TS_HEADER_MAX_STUFFING_BYTES) + n_stuffing_bytes = PES_TS_HEADER_MAX_STUFFING_BYTES; + + /* the AF will only be its 'length' field with a value of zero */ + if (n_stuffing_bytes == 1) { + nbytes += vidtv_memset(dest_buf + dest_offset + nbytes, + 0, + n_stuffing_bytes, + dest_offset + nbytes, + buf_sz); + + return nbytes; + } + + n_stuffing_bytes -= sizeof(ts_adap); + + /* length _immediately_ following 'adaptation_field_length' */ + ts_adap.length = sizeof(ts_adap) - + sizeof(ts_adap.length) + + n_stuffing_bytes; + + /* write the adap after the TS header */ + nbytes += vidtv_memcpy(dest_buf + dest_offset + nbytes, + &ts_adap, + sizeof(ts_adap), + dest_offset + nbytes, + buf_sz); + + /* write the stuffing bytes */ + nbytes += vidtv_memset(dest_buf + dest_offset + nbytes, + 0xff, + n_stuffing_bytes, + dest_offset + nbytes, + buf_sz); + + return nbytes; +} + +static u32 vidtv_pes_write_ts_h(struct pes_ts_header_write_args args) +{ + /* number of bytes written by this function */ + u32 nbytes = 0; + struct vidtv_mpeg_ts ts_header = {0}; + + ts_header.sync_byte = TS_SYNC_BYTE; + ts_header.tei = 0; + ts_header.pid = args.pid; + ts_header.priority = 0; + ts_header.scrambling = 0; /* not scrambled */ + ts_header.adaptation_field = 0; + ts_header.payload = 1; + + ts_header.payload_start = (!args.wrote_pes_header) ? 1 : 0; + ts_header.continuity_counter = *args.continuity_counter; + + vidtv_ts_inc_cc(args.continuity_counter); + + cpu_to_be16s(&ts_header.bitfield); + + /* write the TS header */ + nbytes += vidtv_memcpy(args.dest_buf + args.dest_offset + nbytes, + &ts_header, + sizeof(ts_header), + args.dest_offset + nbytes, + args.dest_buf_sz); + + be16_to_cpus(&ts_header.bitfield); + /* write stuffing, if any */ + nbytes += vidtv_pes_write_stuffing(&ts_header, + args.dest_buf, + args.dest_offset + nbytes, + args.n_stuffing_bytes, + args.dest_buf_sz); + + return nbytes; +} + +u32 vidtv_pes_write_into(struct pes_write_args args) +{ + u32 nbytes_past_boundary = (args.dest_offset % TS_PACKET_LEN); + bool aligned = (nbytes_past_boundary == 0); + + struct pes_ts_header_write_args ts_header_args = {0}; + struct pes_header_write_args pes_header_args = {0}; + + /* number of bytes written by this function */ + u32 nbytes = 0; + u32 remaining_len = args.access_unit_len; + + bool wrote_pes_header = false; + bool stuff = false; + + u32 available_space = 0; + u32 payload_write_len = 0; + u32 num_stuffing_bytes = 0; + + /* Just a sanity check, should not really happen because we stuff the + * TS packet when we finish writing the PES data, but if this happens + * then we have messed up the logic somewhere. + * + * Also note that, unlike packets for PSI data, we need to carry PES + * packets aligned with the payload of transport packets, that is the + * first byte of each PES header must be the first byte in the payload + * of a transport packet. As a consequence, the last byte of a PES + * packet must be the last byte of the payload of a transport packet. + */ + WARN_ON(!aligned); + + if (args.send_dts && !args.send_pts) { + pr_warn("%s: forbidden value '01' for PTS_DTS flags", __func__); + args.send_pts = true; + args.pts = args.dts; + } + + /* see SMPTE 302M clause 6.4 */ + if (args.is_s302m_pkt) { + args.send_dts = false; + args.send_pts = true; + } + + while (remaining_len) { + /* + * The amount of space initially available in the TS packet. + * if this is the beginning of the PES packet, we need to + * take into account the space needed for the TS header _and_ + * for the PES header + */ + available_space = (!wrote_pes_header) ? + TS_PAYLOAD_LEN - + vidtv_pes_h_get_regular_len(args.send_pts, + args.send_dts) : + TS_PAYLOAD_LEN; + + /* if the encoder has inserted stuffing bytes in the PES + * header, account for them. + */ + available_space -= args.n_pes_h_s_bytes; + + /* whether we need to stuff the TS packet to align the buffer */ + stuff = remaining_len < available_space; + + /* + * how much of the _actual_ payload we should write in this + * packet. + */ + payload_write_len = (stuff) ? + remaining_len : + available_space; + + num_stuffing_bytes = available_space - payload_write_len; + + /* write ts header */ + ts_header_args.dest_buf = args.dest_buf; + ts_header_args.dest_offset = args.dest_offset + nbytes; + ts_header_args.dest_buf_sz = args.dest_buf_sz; + ts_header_args.pid = args.pid; + ts_header_args.continuity_counter = args.continuity_counter; + ts_header_args.wrote_pes_header = wrote_pes_header; + ts_header_args.n_stuffing_bytes = num_stuffing_bytes; + + nbytes += vidtv_pes_write_ts_h(ts_header_args); + + if (!wrote_pes_header) { + /* write the PES header only once */ + pes_header_args.dest_buf = args.dest_buf; + + pes_header_args.dest_offset = args.dest_offset + + nbytes; + + pes_header_args.dest_buf_sz = args.dest_buf_sz; + pes_header_args.is_s302m_pkt = args.is_s302m_pkt; + pes_header_args.send_pts = args.send_pts; + pes_header_args.pts = args.pts; + pes_header_args.send_dts = args.send_dts; + pes_header_args.dts = args.dts; + pes_header_args.stream_id = args.stream_id; + pes_header_args.n_pes_h_s_bytes = args.n_pes_h_s_bytes; + + nbytes += vidtv_pes_write_h(pes_header_args); + wrote_pes_header = true; + } + + /* write as much of the payload as we possibly can */ + nbytes += vidtv_memcpy(args.dest_buf + + args.dest_offset + + nbytes, + args.from, + payload_write_len, + args.dest_offset + nbytes, + args.dest_buf_sz); + + args.from += payload_write_len; + args.dest_offset += nbytes; + + /* sanity check for underflow */ + WARN_ON(remaining_len - payload_write_len > remaining_len); + remaining_len -= payload_write_len; + } + + return nbytes; +} diff --git a/drivers/media/test-drivers/vidtv/vidtv_pes.h b/drivers/media/test-drivers/vidtv/vidtv_pes.h new file mode 100644 index 0000000000000..00ede32adf476 --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_pes.h @@ -0,0 +1,185 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Vidtv serves as a reference DVB driver and helps validate the existing APIs + * in the media subsystem. It can also aid developers working on userspace + * applications. + * + * This file contains the logic to translate the ES data for one access unit + * from an encoder into MPEG TS packets. It does so by first encapsulating it + * with a PES header and then splitting it into TS packets. + * + * Written by Daniel W. S. Almeida + */ + +#ifndef VIDTV_PES_H +#define VIDTV_PES_H + +#include +#include +#include "vidtv_common.h" + +#define PES_MAX_LEN 65536 /* Set 'length' to 0 if greater */ +#define PES_START_CODE_PREFIX 0x001 /* 00 00 01 */ + +struct vidtv_pes_optional_pts { + struct { + #if defined(__LITTLE_ENDIAN_BITFIELD) + u8 marker3:1; /* always 0x1 */ + u16 pts3:15; + u8 marker2:1; /* always 0x1 */ + u16 pts2:15; + u8 marker1:1; /* always 0x1 */ + u8 pts1:3; + u8 two:4; /* always 0010b */ + #elif defined(__BIG_ENDIAN_BITFIELD) + u8 two:4; /* always 0010b */ + u8 pts1:3; + u8 marker1:1; /* always 0x1 */ + u16 pts2:15; + u8 marker2:1; /* always 0x1 */ + u16 pts3:15; + u8 marker3:1; /* always 0x1 */ + #else + #error "Please fix " + #endif + } __packed; +} __packed; + +struct vidtv_pes_optional_pts_dts { + struct { + #if defined(__LITTLE_ENDIAN_BITFIELD) + u8 marker6:1; /* always 0x1 */ + u16 dts3:15; + u8 marker5:1; /* always 0x1 */ + u16 dts2:15; + u8 marker4:1; /* always 0x1 */ + u8 dts1:3; + u8 one:4; /* always 0001b */ + u8 marker3:1; /* always 0x1 */ + u16 pts3:15; + u8 marker2:1; /* always 0x1 */ + u16 pts2:15; + u8 marker1:1; /* always 0x1 */ + u8 pts1:3; + u8 three:4; /* always 0011b */ + #elif defined(__BIG_ENDIAN_BITFIELD) + u8 three:4; /* always 0011b */ + u8 pts1:3; + u8 marker1:1; /* always 0x1 */ + u16 pts2:15; + u8 marker2:1; /* always 0x1 */ + u16 pts3:15; + u8 marker3:1; /* always 0x1 */ + u8 one:4; /* always 0001b */ + u8 dts1:3; + u8 marker4:1; /* always 0x1 */ + u16 dts2:15; + u8 marker5:1; /* always 0x1 */ + u16 dts3:15; + u8 marker6:1; /* always 0x1 */ + #else + #error "Please fix " + #endif + } __packed; +} __packed; + +struct vidtv_pes_optional { + union { + u16 bitfield; + struct { + u16 two:2; /* always 0x2*/ + u16 PES_scrambling_control:2; + u16 PES_priority:1; + u16 data_alignment_indicator:1; /* ununsed for us */ + u16 copyright:1; + u16 original_or_copy:1; + u16 PTS_DTS:2; + /* These flags show which components are actually + * present in the "optinal fields" in the optinal PES + * header and which are not. Vidtv currently does + * not need any of these. + */ + u16 ESCR:1; + u16 ES_rate:1; + u16 DSM_trick_mode:1; + u16 additional_copy_info:1; + u16 PES_CRC:1; + u16 PES_extension:1; + } __packed; + } __packed; + u8 length; +} __packed; + +struct vidtv_mpeg_pes { + union { + u32 bitfield; + struct { + /* These two together make the 32-bit start-code */ + u32 packet_start_code_prefix:24; + u32 stream_id:8; + } __packed; + } __packed; + /* after this field until the end of the PES data payload */ + u16 length; + struct vidtv_pes_optional optional[]; +} __packed; + +struct pes_header_write_args { + void *dest_buf; + u32 dest_offset; + u32 dest_buf_sz; + bool is_s302m_pkt; + + bool send_pts; + u64 pts; + + bool send_dts; + u64 dts; + + u16 stream_id; + /* might be used by an encoder if needed, gets discarded by decoder */ + u32 n_pes_h_s_bytes; +}; + +struct pes_ts_header_write_args { + void *dest_buf; + u32 dest_offset; + u32 dest_buf_sz; + u16 pid; + u8 *continuity_counter; + bool wrote_pes_header; + u32 n_stuffing_bytes; +}; + +struct pes_write_args { + void *dest_buf; /* pointer to a program mux buffer */ + void *from; /* pointer to the encoder buffer */ + + /* the size of one access unit (with any headers it might need) */ + u32 access_unit_len; + + u32 dest_offset; /* where to start writing in the program mux buffer */ + u32 dest_buf_sz; /* how big is the program mux buffer */ + u16 pid; /* TS packet ID */ + + /* use SMPTE 302M to packetize the data */ + bool is_s302m_pkt; + + u8 *continuity_counter; /* incremented for every TS packet */ + + /* Examples: Audio streams (0xc0-0xdf), Video streams (0xe0-0xef) */ + u16 stream_id; + + bool send_pts; + u64 pts; + + bool send_dts; + u64 dts; + + /* might be used by an encoder if needed, gets discarded by decoder */ + u32 n_pes_h_s_bytes; +}; + +u32 vidtv_pes_write_into(struct pes_write_args args); + +#endif // VIDTV_PES_H From patchwork Sat May 2 03:22:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Almeida X-Patchwork-Id: 63513 Received: from vger.kernel.org ([23.128.96.18]) by www.linuxtv.org with esmtp (Exim 4.92) (envelope-from ) id 1jUih8-007NXn-Rv; Sat, 02 May 2020 03:20:05 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727963AbgEBDXQ (ORCPT + 1 other); Fri, 1 May 2020 23:23:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39998 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726439AbgEBDXN (ORCPT ); Fri, 1 May 2020 23:23:13 -0400 Received: from mail-qk1-x744.google.com (mail-qk1-x744.google.com [IPv6:2607:f8b0:4864:20::744]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 27554C061A0C; Fri, 1 May 2020 20:23:13 -0700 (PDT) Received: by mail-qk1-x744.google.com with SMTP id c63so11238954qke.2; Fri, 01 May 2020 20:23:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=jDDEMN/30hOo7R+KjT+5XLDSXHeWUGBpj8iKrJCUbes=; b=u28DUlFgeZpTA5mZ7FhVnopwhyhlF2X7IzIv5Wr3ZS1LJUjA/awBqZUo4R6eTYY8Qg Lr8G3eENyTraRpbYGe89DcKsTb+ckp7Mfb+iLXymbcsYFE5xq7xcmygg0p2FEDr30nsp YlYezN6b0X+WF3faakwAt8/HDUGleQqZvTEr+xCWlRhTrdIL20DHF5U5KYV9UG6S9Q2j pNkw1D+OU5TBy2p3opJ2H9ChYhgej8iEQU6FOIZ+l3ckWqoW2sASuvONaIFhBH3kII9T L6SD57aiRDmR1H0GFfLK+uYQthsrTD3/6yfIiylLTYvNygNuA6J6CDzfnxIAdFSp/dgF WQwg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=jDDEMN/30hOo7R+KjT+5XLDSXHeWUGBpj8iKrJCUbes=; b=K42UTUxuyBQiUwn8Y1kHOolD6t9sMWTDC+75mgqKpfzs1SQQ4ej2g4MO7o9uMbbhBJ BEETq68CqchfcgWWSiB9oKgxfKQwX+j3dHr1W861R/OdWKiBQBwi1b6ChFGlz5QveEH2 ZeJneFZl9swpnGPmYBw6cs43Qg39wi2KWo23yJSMiVvU5eNiC63f20QsXGIpUe5qcIE9 AuodTiIVt48y5zMCyoBUzN0bI/I0wI1wIHdRFFYLrryUwOFsQc2EjZNPyZZKFm7KMv8U LGmJFsF7Olr0Ycg2v4Iqq0eZyx9BTiIXctdaOtOCReVWUBhct0ceVdGGssGcpBRIOa8g uoBg== X-Gm-Message-State: AGi0PuY2hEX9l0dP5IfoQbDwgRFbHQQQdGtFr1B7QBFozTpCk7m/TZ/K 7HTOS3pd3CSpMRuhXwTPclg= X-Google-Smtp-Source: APiQypKmX6Rc0pjYe6fd4ShoOMcqQ1blU277a8iyzpX7HQCyUMdyCvjBq/wW7znTfeVS6n2XMnO2Jg== X-Received: by 2002:a37:8d85:: with SMTP id p127mr6730585qkd.44.1588389791830; Fri, 01 May 2020 20:23:11 -0700 (PDT) Received: from localhost.localdomain ([2804:18:602b:723a:1b2a:57a1:a611:34ed]) by smtp.gmail.com with ESMTPSA id c41sm4410399qta.96.2020.05.01.20.23.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 May 2020 20:23:11 -0700 (PDT) From: "Daniel W. S. Almeida" X-Google-Original-From: Daniel W. S. Almeida To: mchehab+huawei@kernel.org, sean@mess.org, kstewart@linuxfoundation.org, allison@lohutok.net, tglx@linutronix.de Cc: "Daniel W. S. Almeida" , linux-media@vger.kernel.org, skhan@linuxfoundation.org, linux-kernel-mentees@lists.linuxfoundation.org, linux-kernel@vger.kernel.org Subject: [RFC, WIP, v4 10/11] media: vidtv: Implement a SMPTE 302M encoder Date: Sat, 2 May 2020 00:22:15 -0300 Message-Id: <20200502032216.197977-11-dwlsalmeida@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200502032216.197977-1-dwlsalmeida@gmail.com> References: <20200502032216.197977-1-dwlsalmeida@gmail.com> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-LSpam-Score: -2.5 (--) X-LSpam-Report: No, score=-2.5 required=5.0 tests=BAYES_00=-1.9,DKIM_SIGNED=0.1,DKIM_VALID=-0.1,DKIM_VALID_AU=-0.1,FREEMAIL_FORGED_FROMDOMAIN=0.001,FREEMAIL_FROM=0.001,HEADER_FROM_DIFFERENT_DOMAINS=0.5,MAILING_LIST_MULTI=-1 autolearn=ham autolearn_force=no From: "Daniel W. S. Almeida" Implement a S302M encoder to make it possible to insert PCM audio data in the generated MPEG Transport Stream. This shall enable passing an audio signal into userspace so it can be decoded and played by media software. Signed-off-by: Daniel W. S. Almeida --- drivers/media/test-drivers/vidtv/Makefile | 3 +- .../media/test-drivers/vidtv/vidtv_common.h | 2 + .../media/test-drivers/vidtv/vidtv_encoder.h | 103 +++ .../media/test-drivers/vidtv/vidtv_s302m.c | 608 ++++++++++++++++++ .../media/test-drivers/vidtv/vidtv_s302m.h | 99 +++ 5 files changed, 814 insertions(+), 1 deletion(-) create mode 100644 drivers/media/test-drivers/vidtv/vidtv_encoder.h create mode 100644 drivers/media/test-drivers/vidtv/vidtv_s302m.c create mode 100644 drivers/media/test-drivers/vidtv/vidtv_s302m.h diff --git a/drivers/media/test-drivers/vidtv/Makefile b/drivers/media/test-drivers/vidtv/Makefile index e3a6540f50e87..c916eb19d73bb 100644 --- a/drivers/media/test-drivers/vidtv/Makefile +++ b/drivers/media/test-drivers/vidtv/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 vidtv_demod-objs := vidtv_common.o -vidtv_bridge-objs := vidtv_common.o vidtv_ts.o vidtv_psi.o vidtv_pes.o +vidtv_bridge-objs := vidtv_common.o vidtv_ts.o vidtv_psi.o vidtv_pes.o \ + vidtv_s302m.o obj-$(CONFIG_DVB_VIDTV) += vidtv_tuner.o vidtv_demod.o vidtv_bridge.o diff --git a/drivers/media/test-drivers/vidtv/vidtv_common.h b/drivers/media/test-drivers/vidtv/vidtv_common.h index 3b68f95c5f6c8..170646497eb58 100644 --- a/drivers/media/test-drivers/vidtv/vidtv_common.h +++ b/drivers/media/test-drivers/vidtv/vidtv_common.h @@ -13,6 +13,8 @@ #include #include +#define CLOCK_UNIT_90KHZ 90000 + u32 vidtv_memcpy(void *to, const void *from, size_t len, diff --git a/drivers/media/test-drivers/vidtv/vidtv_encoder.h b/drivers/media/test-drivers/vidtv/vidtv_encoder.h new file mode 100644 index 0000000000000..f483200fd781c --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_encoder.h @@ -0,0 +1,103 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Vidtv serves as a reference DVB driver and helps validate the existing APIs + * in the media subsystem. It can also aid developers working on userspace + * applications. + * + * This file contains a generic encoder type that can provide data for a stream + * + * Written by Daniel W. S. Almeida + */ + +#ifndef VIDTV_ENCODER_H +#define VIDTV_ENCODER_H + +#include + +enum vidtv_encoder_id { + /* add IDs here when implementing new encoders */ + S302M, +}; + +struct vidtv_encoder { + /* so we can cast to a concrete implementation when needed */ + enum vidtv_encoder_id id; + /* usually same as the stream name */ + char *name; + + /* the encoder's internal buffer for the access units */ + u8 *encoder_buf; + /* the encoder buffer size, in bytes */ + u32 encoder_buf_sz; + + /* our byte position in the encoder buffer */ + u32 encoder_buf_offset; + + /* how many samples we have encoded in total */ + u32 sample_count; + + u32 previous_sample_count; + + /* the number of access units ready */ + u32 nunits; + /* the number of samples per access unit */ + u32 *samples_per_unit; + /* pts array mapping pts[i] -> AU[i] */ + u64 *pts; + /* dts array mapping dts[i] -> AU[i] */ + u64 *dts; + /* array mapping how many bytes were written per AU */ + u32 *nbytes; + /* array keeping track of AU offsets in buffer */ + u32 *offsets; + + /* + * the source of raw data to be encoded, encoder might set a default + * source if NULL + */ + void *src_buf; + /* the source buffer size, in bytes */ + u32 src_buf_sz; + + /* our byte position in the src buffer */ + u32 src_buf_offset; + + bool video; /* either video or audio */ + void *ctx; /* encoder-specific state */ + + /* Examples: Audio streams (0xc0-0xdf), Video streams (0xe0-0xef) */ + u16 stream_id; + + /* the TS PID to use for the elementary stream in this encoder */ + u16 es_pid; + + /* prepare enough AUs for the given amount of time */ + void *(*encode)(struct vidtv_encoder *e, u64 elapsed_time_usecs); + + /* clear the encoder output */ + u8 (*clear)(struct vidtv_encoder *e); + + /* attempt to synchronize with the encoder below */ + struct vidtv_encoder *sync; + + u32 sampling_rate_hz; /* or fps, if video */ + + /* controls dynamic memory allocation for the arrays */ + u8 access_unit_capacity; + + /* + * called when the encoder runs out of data + * the encoder might optionally wrap around the src data if this is not + * implemented + * this is so the source can read data in a piecemeal fashion instead + * of having to provide it all at once + */ + void (*last_sample_cb)(u32 sample_no); + + /* destroy this encoder, freeing any allocated resources */ + void (*destroy)(struct vidtv_encoder *e); + + struct vidtv_encoder *next; +}; + +#endif /* VIDTV_ENCODER_H */ diff --git a/drivers/media/test-drivers/vidtv/vidtv_s302m.c b/drivers/media/test-drivers/vidtv/vidtv_s302m.c new file mode 100644 index 0000000000000..b08bfff7b8f27 --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_s302m.c @@ -0,0 +1,608 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Vidtv serves as a reference DVB driver and helps validate the existing APIs + * in the media subsystem. It can also aid developers working on userspace + * applications. + * + * This file contains the code for an AES3 (also known as AES/EBU) encoder. + * It is based on EBU Tech 3250 and SMPTE 302M technical documents. + * + * This encoder currently supports 16bit AES3 subframes using 16bit signed + * integers. + * + * Note: AU stands for Access Unit, and AAU stands for Audio Access Unit + * + * Written by Daniel W. S. Almeida + */ + +#include +#include +#include +#include +#include +#include +#include + +#include "vidtv_s302m.h" +#include "vidtv_encoder.h" +#include "vidtv_common.h" + +#define S302M_SAMPLING_RATE_HZ 48000 + +/* see EBU Tech 3250 2004 clause 4 */ +#define CHANNEL_STATUS_BIT_LEN 92 + +#define S302M_2CHANNELS 0 +#define S302M_BITS_PER_SAMPLE_16 0 + +/* see preamble definition in EBU Tech 3250 2004 clause 2.4 */ +#define PREAMBLE_X_F0 0xe2 /* sub-frame 1 */ +#define PREAMBLE_Y_F0 0xe4 /* sub-frame 2 */ +#define PREAMBLE_Z_F0 0xe8 /* sub-frame 1 + block start */ +/* F0 and F1 refer to whether the F bit was set in the previous sub-frame */ +#define PREAMBLE_X_F1 0x1d /* sub-frame 1 */ +#define PREAMBLE_Y_F1 0X1b /* sub-frame 2 */ +#define PREAMBLE_Z_F1 0x17 /* sub-frame 1 + block start */ + +#define S302M_BLOCK_SZ 192 +#define S302M_SIN_LUT_SZ 1024 + +static int s302m_sin_lut[S302M_SIN_LUT_SZ] = { + 0x8000, 0x80c9, 0x8192, 0x825b, 0x8324, 0x83ed, 0x84b6, 0x857e, + 0x8647, 0x8710, 0x87d9, 0x88a1, 0x896a, 0x8a32, 0x8afb, 0x8bc3, + 0x8c8b, 0x8d53, 0x8e1b, 0x8ee3, 0x8fab, 0x9072, 0x9139, 0x9201, + 0x92c7, 0x938e, 0x9455, 0x951b, 0x95e1, 0x96a7, 0x976d, 0x9833, + 0x98f8, 0x99bd, 0x9a82, 0x9b47, 0x9c0b, 0x9ccf, 0x9d93, 0x9e56, + 0x9f19, 0x9fdc, 0xa09f, 0xa161, 0xa223, 0xa2e5, 0xa3a6, 0xa467, + 0xa527, 0xa5e8, 0xa6a7, 0xa767, 0xa826, 0xa8e5, 0xa9a3, 0xaa61, + 0xab1f, 0xabdc, 0xac98, 0xad55, 0xae10, 0xaecc, 0xaf87, 0xb041, + 0xb0fb, 0xb1b5, 0xb26e, 0xb326, 0xb3de, 0xb496, 0xb54d, 0xb603, + 0xb6b9, 0xb76f, 0xb824, 0xb8d8, 0xb98c, 0xba3f, 0xbaf2, 0xbba4, + 0xbc56, 0xbd07, 0xbdb7, 0xbe67, 0xbf17, 0xbfc5, 0xc073, 0xc121, + 0xc1cd, 0xc279, 0xc325, 0xc3d0, 0xc47a, 0xc524, 0xc5cc, 0xc675, + 0xc71c, 0xc7c3, 0xc869, 0xc90f, 0xc9b3, 0xca57, 0xcafb, 0xcb9d, + 0xcc3f, 0xcce0, 0xcd81, 0xce20, 0xcebf, 0xcf5d, 0xcffb, 0xd097, + 0xd133, 0xd1ce, 0xd268, 0xd302, 0xd39a, 0xd432, 0xd4c9, 0xd55f, + 0xd5f5, 0xd689, 0xd71d, 0xd7b0, 0xd842, 0xd8d3, 0xd964, 0xd9f3, + 0xda82, 0xdb0f, 0xdb9c, 0xdc28, 0xdcb3, 0xdd3d, 0xddc7, 0xde4f, + 0xded7, 0xdf5d, 0xdfe3, 0xe068, 0xe0eb, 0xe16e, 0xe1f0, 0xe271, + 0xe2f1, 0xe370, 0xe3ee, 0xe46b, 0xe4e8, 0xe563, 0xe5dd, 0xe656, + 0xe6cf, 0xe746, 0xe7bc, 0xe831, 0xe8a6, 0xe919, 0xe98b, 0xe9fc, + 0xea6d, 0xeadc, 0xeb4a, 0xebb7, 0xec23, 0xec8e, 0xecf8, 0xed61, + 0xedc9, 0xee30, 0xee96, 0xeefa, 0xef5e, 0xefc1, 0xf022, 0xf083, + 0xf0e2, 0xf140, 0xf19d, 0xf1f9, 0xf254, 0xf2ae, 0xf307, 0xf35e, + 0xf3b5, 0xf40a, 0xf45f, 0xf4b2, 0xf504, 0xf555, 0xf5a5, 0xf5f3, + 0xf641, 0xf68d, 0xf6d8, 0xf722, 0xf76b, 0xf7b3, 0xf7fa, 0xf83f, + 0xf884, 0xf8c7, 0xf909, 0xf94a, 0xf989, 0xf9c8, 0xfa05, 0xfa41, + 0xfa7c, 0xfab6, 0xfaee, 0xfb26, 0xfb5c, 0xfb91, 0xfbc5, 0xfbf8, + 0xfc29, 0xfc59, 0xfc88, 0xfcb6, 0xfce3, 0xfd0e, 0xfd39, 0xfd62, + 0xfd89, 0xfdb0, 0xfdd5, 0xfdfa, 0xfe1d, 0xfe3e, 0xfe5f, 0xfe7e, + 0xfe9c, 0xfeb9, 0xfed5, 0xfeef, 0xff09, 0xff21, 0xff37, 0xff4d, + 0xff61, 0xff74, 0xff86, 0xff97, 0xffa6, 0xffb4, 0xffc1, 0xffcd, + 0xffd8, 0xffe1, 0xffe9, 0xfff0, 0xfff5, 0xfff9, 0xfffd, 0xfffe, + 0xffff, 0xfffe, 0xfffd, 0xfff9, 0xfff5, 0xfff0, 0xffe9, 0xffe1, + 0xffd8, 0xffcd, 0xffc1, 0xffb4, 0xffa6, 0xff97, 0xff86, 0xff74, + 0xff61, 0xff4d, 0xff37, 0xff21, 0xff09, 0xfeef, 0xfed5, 0xfeb9, + 0xfe9c, 0xfe7e, 0xfe5f, 0xfe3e, 0xfe1d, 0xfdfa, 0xfdd5, 0xfdb0, + 0xfd89, 0xfd62, 0xfd39, 0xfd0e, 0xfce3, 0xfcb6, 0xfc88, 0xfc59, + 0xfc29, 0xfbf8, 0xfbc5, 0xfb91, 0xfb5c, 0xfb26, 0xfaee, 0xfab6, + 0xfa7c, 0xfa41, 0xfa05, 0xf9c8, 0xf989, 0xf94a, 0xf909, 0xf8c7, + 0xf884, 0xf83f, 0xf7fa, 0xf7b3, 0xf76b, 0xf722, 0xf6d8, 0xf68d, + 0xf641, 0xf5f3, 0xf5a5, 0xf555, 0xf504, 0xf4b2, 0xf45f, 0xf40a, + 0xf3b5, 0xf35e, 0xf307, 0xf2ae, 0xf254, 0xf1f9, 0xf19d, 0xf140, + 0xf0e2, 0xf083, 0xf022, 0xefc1, 0xef5e, 0xeefa, 0xee96, 0xee30, + 0xedc9, 0xed61, 0xecf8, 0xec8e, 0xec23, 0xebb7, 0xeb4a, 0xeadc, + 0xea6d, 0xe9fc, 0xe98b, 0xe919, 0xe8a6, 0xe831, 0xe7bc, 0xe746, + 0xe6cf, 0xe656, 0xe5dd, 0xe563, 0xe4e8, 0xe46b, 0xe3ee, 0xe370, + 0xe2f1, 0xe271, 0xe1f0, 0xe16e, 0xe0eb, 0xe068, 0xdfe3, 0xdf5d, + 0xded7, 0xde4f, 0xddc7, 0xdd3d, 0xdcb3, 0xdc28, 0xdb9c, 0xdb0f, + 0xda82, 0xd9f3, 0xd964, 0xd8d3, 0xd842, 0xd7b0, 0xd71d, 0xd689, + 0xd5f5, 0xd55f, 0xd4c9, 0xd432, 0xd39a, 0xd302, 0xd268, 0xd1ce, + 0xd133, 0xd097, 0xcffb, 0xcf5d, 0xcebf, 0xce20, 0xcd81, 0xcce0, + 0xcc3f, 0xcb9d, 0xcafb, 0xca57, 0xc9b3, 0xc90f, 0xc869, 0xc7c3, + 0xc71c, 0xc675, 0xc5cc, 0xc524, 0xc47a, 0xc3d0, 0xc325, 0xc279, + 0xc1cd, 0xc121, 0xc073, 0xbfc5, 0xbf17, 0xbe67, 0xbdb7, 0xbd07, + 0xbc56, 0xbba4, 0xbaf2, 0xba3f, 0xb98c, 0xb8d8, 0xb824, 0xb76f, + 0xb6b9, 0xb603, 0xb54d, 0xb496, 0xb3de, 0xb326, 0xb26e, 0xb1b5, + 0xb0fb, 0xb041, 0xaf87, 0xaecc, 0xae10, 0xad55, 0xac98, 0xabdc, + 0xab1f, 0xaa61, 0xa9a3, 0xa8e5, 0xa826, 0xa767, 0xa6a7, 0xa5e8, + 0xa527, 0xa467, 0xa3a6, 0xa2e5, 0xa223, 0xa161, 0xa09f, 0x9fdc, + 0x9f19, 0x9e56, 0x9d93, 0x9ccf, 0x9c0b, 0x9b47, 0x9a82, 0x99bd, + 0x98f8, 0x9833, 0x976d, 0x96a7, 0x95e1, 0x951b, 0x9455, 0x938e, + 0x92c7, 0x9201, 0x9139, 0x9072, 0x8fab, 0x8ee3, 0x8e1b, 0x8d53, + 0x8c8b, 0x8bc3, 0x8afb, 0x8a32, 0x896a, 0x88a1, 0x87d9, 0x8710, + 0x8647, 0x857e, 0x84b6, 0x83ed, 0x8324, 0x825b, 0x8192, 0x80c9, + 0x8000, 0x7f36, 0x7e6d, 0x7da4, 0x7cdb, 0x7c12, 0x7b49, 0x7a81, + 0x79b8, 0x78ef, 0x7826, 0x775e, 0x7695, 0x75cd, 0x7504, 0x743c, + 0x7374, 0x72ac, 0x71e4, 0x711c, 0x7054, 0x6f8d, 0x6ec6, 0x6dfe, + 0x6d38, 0x6c71, 0x6baa, 0x6ae4, 0x6a1e, 0x6958, 0x6892, 0x67cc, + 0x6707, 0x6642, 0x657d, 0x64b8, 0x63f4, 0x6330, 0x626c, 0x61a9, + 0x60e6, 0x6023, 0x5f60, 0x5e9e, 0x5ddc, 0x5d1a, 0x5c59, 0x5b98, + 0x5ad8, 0x5a17, 0x5958, 0x5898, 0x57d9, 0x571a, 0x565c, 0x559e, + 0x54e0, 0x5423, 0x5367, 0x52aa, 0x51ef, 0x5133, 0x5078, 0x4fbe, + 0x4f04, 0x4e4a, 0x4d91, 0x4cd9, 0x4c21, 0x4b69, 0x4ab2, 0x49fc, + 0x4946, 0x4890, 0x47db, 0x4727, 0x4673, 0x45c0, 0x450d, 0x445b, + 0x43a9, 0x42f8, 0x4248, 0x4198, 0x40e8, 0x403a, 0x3f8c, 0x3ede, + 0x3e32, 0x3d86, 0x3cda, 0x3c2f, 0x3b85, 0x3adb, 0x3a33, 0x398a, + 0x38e3, 0x383c, 0x3796, 0x36f0, 0x364c, 0x35a8, 0x3504, 0x3462, + 0x33c0, 0x331f, 0x327e, 0x31df, 0x3140, 0x30a2, 0x3004, 0x2f68, + 0x2ecc, 0x2e31, 0x2d97, 0x2cfd, 0x2c65, 0x2bcd, 0x2b36, 0x2aa0, + 0x2a0a, 0x2976, 0x28e2, 0x284f, 0x27bd, 0x272c, 0x269b, 0x260c, + 0x257d, 0x24f0, 0x2463, 0x23d7, 0x234c, 0x22c2, 0x2238, 0x21b0, + 0x2128, 0x20a2, 0x201c, 0x1f97, 0x1f14, 0x1e91, 0x1e0f, 0x1d8e, + 0x1d0e, 0x1c8f, 0x1c11, 0x1b94, 0x1b17, 0x1a9c, 0x1a22, 0x19a9, + 0x1930, 0x18b9, 0x1843, 0x17ce, 0x1759, 0x16e6, 0x1674, 0x1603, + 0x1592, 0x1523, 0x14b5, 0x1448, 0x13dc, 0x1371, 0x1307, 0x129e, + 0x1236, 0x11cf, 0x1169, 0x1105, 0x10a1, 0x103e, 0xfdd, 0xf7c, + 0xf1d, 0xebf, 0xe62, 0xe06, 0xdab, 0xd51, 0xcf8, 0xca1, + 0xc4a, 0xbf5, 0xba0, 0xb4d, 0xafb, 0xaaa, 0xa5a, 0xa0c, + 0x9be, 0x972, 0x927, 0x8dd, 0x894, 0x84c, 0x805, 0x7c0, + 0x77b, 0x738, 0x6f6, 0x6b5, 0x676, 0x637, 0x5fa, 0x5be, + 0x583, 0x549, 0x511, 0x4d9, 0x4a3, 0x46e, 0x43a, 0x407, + 0x3d6, 0x3a6, 0x377, 0x349, 0x31c, 0x2f1, 0x2c6, 0x29d, + 0x276, 0x24f, 0x22a, 0x205, 0x1e2, 0x1c1, 0x1a0, 0x181, + 0x163, 0x146, 0x12a, 0x110, 0xf6, 0xde, 0xc8, 0xb2, + 0x9e, 0x8b, 0x79, 0x68, 0x59, 0x4b, 0x3e, 0x32, + 0x27, 0x1e, 0x16, 0xf, 0xa, 0x6, 0x2, 0x1, + 0x0, 0x1, 0x2, 0x6, 0xa, 0xf, 0x16, 0x1e, + 0x27, 0x32, 0x3e, 0x4b, 0x59, 0x68, 0x79, 0x8b, + 0x9e, 0xb2, 0xc8, 0xde, 0xf6, 0x110, 0x12a, 0x146, + 0x163, 0x181, 0x1a0, 0x1c1, 0x1e2, 0x205, 0x22a, 0x24f, + 0x276, 0x29d, 0x2c6, 0x2f1, 0x31c, 0x349, 0x377, 0x3a6, + 0x3d6, 0x407, 0x43a, 0x46e, 0x4a3, 0x4d9, 0x511, 0x549, + 0x583, 0x5be, 0x5fa, 0x637, 0x676, 0x6b5, 0x6f6, 0x738, + 0x77b, 0x7c0, 0x805, 0x84c, 0x894, 0x8dd, 0x927, 0x972, + 0x9be, 0xa0c, 0xa5a, 0xaaa, 0xafb, 0xb4d, 0xba0, 0xbf5, + 0xc4a, 0xca1, 0xcf8, 0xd51, 0xdab, 0xe06, 0xe62, 0xebf, + 0xf1d, 0xf7c, 0xfdd, 0x103e, 0x10a1, 0x1105, 0x1169, 0x11cf, + 0x1236, 0x129e, 0x1307, 0x1371, 0x13dc, 0x1448, 0x14b5, 0x1523, + 0x1592, 0x1603, 0x1674, 0x16e6, 0x1759, 0x17ce, 0x1843, 0x18b9, + 0x1930, 0x19a9, 0x1a22, 0x1a9c, 0x1b17, 0x1b94, 0x1c11, 0x1c8f, + 0x1d0e, 0x1d8e, 0x1e0f, 0x1e91, 0x1f14, 0x1f97, 0x201c, 0x20a2, + 0x2128, 0x21b0, 0x2238, 0x22c2, 0x234c, 0x23d7, 0x2463, 0x24f0, + 0x257d, 0x260c, 0x269b, 0x272c, 0x27bd, 0x284f, 0x28e2, 0x2976, + 0x2a0a, 0x2aa0, 0x2b36, 0x2bcd, 0x2c65, 0x2cfd, 0x2d97, 0x2e31, + 0x2ecc, 0x2f68, 0x3004, 0x30a2, 0x3140, 0x31df, 0x327e, 0x331f, + 0x33c0, 0x3462, 0x3504, 0x35a8, 0x364c, 0x36f0, 0x3796, 0x383c, + 0x38e3, 0x398a, 0x3a33, 0x3adb, 0x3b85, 0x3c2f, 0x3cda, 0x3d86, + 0x3e32, 0x3ede, 0x3f8c, 0x403a, 0x40e8, 0x4198, 0x4248, 0x42f8, + 0x43a9, 0x445b, 0x450d, 0x45c0, 0x4673, 0x4727, 0x47db, 0x4890, + 0x4946, 0x49fc, 0x4ab2, 0x4b69, 0x4c21, 0x4cd9, 0x4d91, 0x4e4a, + 0x4f04, 0x4fbe, 0x5078, 0x5133, 0x51ef, 0x52aa, 0x5367, 0x5423, + 0x54e0, 0x559e, 0x565c, 0x571a, 0x57d9, 0x5898, 0x5958, 0x5a17, + 0x5ad8, 0x5b98, 0x5c59, 0x5d1a, 0x5ddc, 0x5e9e, 0x5f60, 0x6023, + 0x60e6, 0x61a9, 0x626c, 0x6330, 0x63f4, 0x64b8, 0x657d, 0x6642, + 0x6707, 0x67cc, 0x6892, 0x6958, 0x6a1e, 0x6ae4, 0x6baa, 0x6c71, + 0x6d38, 0x6dfe, 0x6ec6, 0x6f8d, 0x7054, 0x711c, 0x71e4, 0x72ac, + 0x7374, 0x743c, 0x7504, 0x75cd, 0x7695, 0x775e, 0x7826, 0x78ef, + 0x79b8, 0x7a81, 0x7b49, 0x7c12, 0x7cdb, 0x7da4, 0x7e6d, 0x7f36 +}; + +static void vidtv_s302m_compute_nunits(struct vidtv_encoder *e) +{ + /* + * match the amount of video units if we are trying to sync with a video + * encoder + */ + if (e->sync && e->sync->video) { + e->nunits = e->sync->nunits; + return; + } + + /* otherwise return enough samples for the timedelta in one AU */ + e->nunits = 1; +} + +static void +vidtv_s302m_compute_sample_count_v(struct vidtv_encoder *e) +{ + /* compute sample count for VAU[i] in 'sync' */ + u32 vau_duration_usecs; + u32 sample_duration_usecs; + u32 i; + u32 sample_count; + u32 s; + + vau_duration_usecs = USEC_PER_SEC / e->sync->sampling_rate_hz; + sample_duration_usecs = USEC_PER_SEC / e->sampling_rate_hz; + + for (i = 0; i < e->sync->nunits; ++i) { + sample_count = e->samples_per_unit[i]; + s = DIV_ROUND_UP(vau_duration_usecs, sample_duration_usecs); + e->samples_per_unit[i] = s; + } +} + +static void +vidtv_s302m_compute_sample_count(struct vidtv_encoder *e, + u64 elapsed_time_usecs) +{ + /* compute sample count for 'elapsed_time_usecs' */ + u32 sample_duration_usecs = USEC_PER_SEC / e->sampling_rate_hz; + + e->samples_per_unit[0] = elapsed_time_usecs / sample_duration_usecs; +} + +static void vidtv_s302m_compute_pts(struct vidtv_encoder *e) +{ + u32 count = e->previous_sample_count; + u32 i; + + for (i = 0; i < e->nunits; ++i) { + count += e->samples_per_unit[i]; + + e->pts[i] = count * + CLOCK_UNIT_90KHZ / e->sampling_rate_hz; + } +} + +static void vidtv_s302m_compute_pts_v(struct vidtv_encoder *e) +{ + u32 i; + + /* use the same pts for video */ + for (i = 0; i < e->sync->nunits; ++i) + e->pts[i] = e->sync->pts[i]; +} + +static bool vidtv_s302m_get_c_bit(struct vidtv_encoder *e) +{ + /* + * see EBU Tech 3250 2004 clause 5.2.1: minimal implementation of + * channel status + */ + struct vidtv_s302m_ctx *ctx = e->ctx; + bool start_was_z; + + start_was_z = ctx->last_start_preamble == PREAMBLE_Z_F0 || + ctx->last_start_preamble == PREAMBLE_Z_F1; + + if (!start_was_z) + return false; + + ++ctx->current_c_bit; + + /* set the bit only if it is the first C bit after a Z preamble */ + return !(ctx->current_c_bit % CHANNEL_STATUS_BIT_LEN); +} + +static s16 vidtv_s302m_get_sample(struct vidtv_encoder *e) +{ + s16 ret; + + /* bug somewhere */ + WARN_ON(e->src_buf_offset > e->src_buf_sz); + + if (e->src_buf_offset >= e->src_buf_sz) { + /* let the source know we are out of data */ + if (e->last_sample_cb) + e->last_sample_cb(e->sample_count); + + e->src_buf_offset = 0; + } + + ret = *(s16 *)(e->src_buf + e->src_buf_offset); + + e->sample_count++; + e->src_buf_offset += sizeof(s16); + + return ret; +} + +static void vidtv_s302m_toggle_subframe(struct vidtv_encoder *e) +{ + struct vidtv_s302m_ctx *ctx = e->ctx; + + ctx->is_subframe_a = !ctx->is_subframe_a; +} + +static bool vidtv_s302m_is_block_start(const struct vidtv_encoder *e) +{ + return e->sample_count % S302M_BLOCK_SZ; +} + +static bool vidtv_s302m_get_f_bit(const struct vidtv_encoder *e) +{ + const struct vidtv_s302m_ctx *ctx = e->ctx; + + return vidtv_s302m_is_block_start(e) && ctx->is_subframe_a; +} + +static u8 vidtv_s302m_get_preamble(struct vidtv_encoder *e) +{ + /* + * some codecs might disregard the preambles (e.g. ffmpeg s302m), but + * we implement them according to the specs anyway, because some other + * codecs might rely on them. + */ + + struct vidtv_s302m_ctx *ctx = e->ctx; + + bool start_was_x = ctx->last_start_preamble == PREAMBLE_X_F0 || + ctx->last_start_preamble == PREAMBLE_X_F1; + + bool start_was_z = ctx->last_start_preamble == PREAMBLE_Z_F0 || + ctx->last_start_preamble == PREAMBLE_Z_F1; + + bool is_block_start = vidtv_s302m_is_block_start(e); + + /* bug somewhere: a block always starts with an A subframe */ + WARN_ON(!ctx->is_subframe_a && is_block_start); + + if (!ctx->is_subframe_a) + return (ctx->last_f) ? PREAMBLE_Y_F1 : PREAMBLE_Y_F0; + + if (start_was_x && is_block_start) { + if (ctx->last_f) { + ctx->last_start_preamble = PREAMBLE_Z_F0; + return PREAMBLE_Z_F0; + } + + ctx->last_start_preamble = PREAMBLE_Z_F1; + return PREAMBLE_Z_F1; + } + + if (start_was_z && is_block_start) { + if (ctx->last_f) { + ctx->last_start_preamble = PREAMBLE_X_F0; + return PREAMBLE_X_F0; + } + + ctx->last_start_preamble = PREAMBLE_X_F1; + return PREAMBLE_X_F1; + } + + return PREAMBLE_X_F0; +} + +static u32 vidtv_s302m_write_subframe(struct vidtv_encoder *e, + struct vidtv_s302m_subframe_16 *f) +{ + u32 nbytes = 0; + + nbytes += vidtv_memcpy(e->encoder_buf + e->encoder_buf_offset, + f, + sizeof(*f), + e->encoder_buf_offset, + VIDTV_S302M_BUF_SZ); + + e->encoder_buf_offset += nbytes; + + return nbytes; +} + +static void vidtv_s302m_write_h(struct vidtv_encoder *e, u32 p_sz) +{ + struct vidtv_smpte_s302m_es h = {0}; + u32 nbytes = 0; + + h.bits_per_sample = S302M_BITS_PER_SAMPLE_16; + h.channel_identification = 0; + h.num_channels = S302M_2CHANNELS; + h.audio_packet_size = p_sz; + + cpu_to_be32s(&h.bitfield); + + nbytes += vidtv_memcpy(e->encoder_buf + e->encoder_buf_offset, + &h, + sizeof(h), + e->encoder_buf_offset, + e->encoder_buf_sz); + + be32_to_cpus(&h.bitfield); + + e->encoder_buf_offset += nbytes; +} + +static void vidtv_s302m_write_frames(struct vidtv_encoder *e) +{ + u32 nbytes = 0; + u32 nbytes_per_unit = 0; + u32 preamble_bit_num = 0; + const u8 preamble_bit_count = 4; + u32 au_sz = 0; + struct vidtv_s302m_ctx *ctx = e->ctx; + struct vidtv_s302m_subframe_16 a = {0}; + struct vidtv_s302m_subframe_16 b = {0}; + u8 preamble_a = 0; + u8 preamble_b = 0; + u8 aux = 0; + s16 sample = 0; + bool v = true; + bool u = false; + bool c; + bool f; + + u32 i; + u32 j; + + ctx->is_subframe_a = true; + + for (i = 0; i < e->nunits; ++i) { + /* stereo: each sample will generate two subframes */ + au_sz = e->samples_per_unit[i] * + sizeof(struct vidtv_s302m_subframe_16) * + 2; + + vidtv_s302m_write_h(e, au_sz); + + for (j = 0; j < e->samples_per_unit[i]; ++j) { + /* keep this in this order */ + preamble_a = vidtv_s302m_get_preamble(e); + sample = cpu_to_le16(vidtv_s302m_get_sample(e)); + c = vidtv_s302m_get_c_bit(e); + f = vidtv_s302m_get_f_bit(e); + + a.preamble = vidtv_extract_bits(preamble_a, + preamble_bit_num % 8, + preamble_bit_count); + a.aux = aux; + a.data_word = sample; + a.v = v; + a.u = u; + a.c = c; + a.f = f; + + vidtv_s302m_toggle_subframe(e); + + preamble_b = vidtv_s302m_get_preamble(e); + c = vidtv_s302m_get_c_bit(e); + f = vidtv_s302m_get_f_bit(e); + + b.preamble = vidtv_extract_bits(preamble_b, + preamble_bit_num % 8, + preamble_bit_count); + b.aux = aux; + b.data_word = sample; + b.v = v; + b.u = u; + b.c = c; + b.f = f; + + preamble_bit_num += preamble_bit_count; + + nbytes_per_unit += vidtv_s302m_write_subframe(e, &a); + nbytes_per_unit += vidtv_s302m_write_subframe(e, &b); + + nbytes += nbytes_per_unit; + + vidtv_s302m_toggle_subframe(e); + } + + e->nbytes[i] = nbytes; + + /* did we write more bytes than we initially computed? */ + WARN_ON(au_sz != nbytes_per_unit); + + e->offsets[i] = nbytes_per_unit; + nbytes_per_unit = 0; + } +} + +static void *vidtv_s302m_encode(struct vidtv_encoder *e, u64 elapsed_time) +{ + /* + * According to SMPTE 302M, an audio access unit is specified as those + * AES3 words that are associated with a corresponding video frame. + * Therefore we should write one AAU for every VAU in the corresponding + * video encoder ('sync'), using the same values for PTS as used by the + * video encoder. + * + * I assume that it is also possible to send audio without any + * associated video, as in a radio-like service. If this is the case, + * we are sending only _one_ AAU with enough audio data for + * 'elapsed_time' instead, computing the value for PTS manually. + */ + + vidtv_s302m_compute_nunits(e); + + if (e->sync && e->sync->video) { + vidtv_s302m_compute_sample_count_v(e); + vidtv_s302m_compute_pts_v(e); + } else { + vidtv_s302m_compute_sample_count(e, elapsed_time); + vidtv_s302m_compute_pts(e); + } + + vidtv_s302m_write_frames(e); + + return e->encoder_buf; +} + +static u8 vidtv_s302m_clear(struct vidtv_encoder *e) +{ + u8 ret = e->nunits; + + e->nunits = 0; + memset(e->samples_per_unit, 0, e->access_unit_capacity); + memset(e->nbytes, 0, e->access_unit_capacity); + memset(e->offsets, 0, e->access_unit_capacity); + memset(e->pts, 0, e->access_unit_capacity); + memset(e->dts, 0, e->access_unit_capacity); + + return ret; +} + +struct vidtv_encoder +*vidtv_s302m_encoder_init(struct vidtv_s302m_encoder_init_args args) +{ + struct vidtv_encoder *e = kzalloc(sizeof(e), GFP_KERNEL); + u32 priv_sz = sizeof(struct vidtv_s302m_ctx); + + if (args.sync) + args.access_unit_capacity = args.sync->access_unit_capacity; + + e->id = S302M; + + e->name = kzalloc(strlen(args.name), GFP_KERNEL); + strncpy(e->name, args.name, strlen(e->name)); + + e->encoder_buf = vzalloc(VIDTV_S302M_BUF_SZ); + e->encoder_buf_sz = VIDTV_S302M_BUF_SZ; + e->encoder_buf_offset = 0; + + e->sample_count = 0; + e->previous_sample_count = 0; + e->nunits = 0; + + e->samples_per_unit = kcalloc(args.access_unit_capacity, + sizeof(u32), + GFP_KERNEL); + + e->pts = kcalloc(args.access_unit_capacity, sizeof(u64), GFP_KERNEL); + e->dts = kcalloc(args.access_unit_capacity, sizeof(u64), GFP_KERNEL); + + e->nbytes = kcalloc(args.access_unit_capacity, + sizeof(u32), + GFP_KERNEL); + + e->offsets = kcalloc(args.access_unit_capacity, + sizeof(u32), + GFP_KERNEL); + + e->src_buf = (args.src_buf) ? args.src_buf : &s302m_sin_lut; + e->src_buf_sz = (args.src_buf) ? args.src_buf_sz : S302M_SIN_LUT_SZ; + e->src_buf_offset = 0; + + e->video = false; + e->ctx = kzalloc(priv_sz, GFP_KERNEL); + + e->encode = vidtv_s302m_encode; + e->clear = vidtv_s302m_clear; + + e->es_pid = args.es_pid; + + e->sync = args.sync; + e->sampling_rate_hz = S302M_SAMPLING_RATE_HZ; + e->access_unit_capacity = args.access_unit_capacity; + + /* we will wrap around 'src' if this is NULL */ + e->last_sample_cb = args.last_sample_cb; + + e->destroy = vidtv_s302m_encoder_destroy; + + if (args.head) { + while (args.head->next) + args.head = args.head->next; + + args.head->next = e; + } + + e->next = NULL; + + return e; +} + +void vidtv_s302m_encoder_destroy(struct vidtv_encoder *e) +{ + WARN_ON(e->id != S302M); + kfree(e->name); + kfree(e->encoder_buf); + kfree(e->samples_per_unit); + kfree(e->pts); + kfree(e->dts); + kfree(e->nbytes); + kfree(e->offsets); + kfree(e->ctx); + kfree(e); +} diff --git a/drivers/media/test-drivers/vidtv/vidtv_s302m.h b/drivers/media/test-drivers/vidtv/vidtv_s302m.h new file mode 100644 index 0000000000000..bfb8b0c80eddf --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_s302m.h @@ -0,0 +1,99 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Vidtv serves as a reference DVB driver and helps validate the existing APIs + * in the media subsystem. It can also aid developers working on userspace + * applications. + * + * This file contains the code for an AES3 (also known as AES/EBU) encoder. + * It is based on EBU Tech 3250 and SMPTE 302M technical documents. + * + * This encoder currently supports 16bit AES3 subframes using 16bit signed + * integers. + * + * Note: AU stands for Access Unit, and AAU stands for Audio Access Unit + * + * Written by Daniel W. S. Almeida + */ + +#ifndef VIDTV_S302M_H +#define VIDTV_S302M_H + +#include +#include +#include "vidtv_encoder.h" + +/* see SMPTE 302M 2007 clause 7.3 */ +#define VIDTV_S302M_BUF_SZ 65024 + +/* see ETSI TS 102 154 v.1.2.1 clause 7.3.5 */ +#define VIDTV_S302M_FORMAT_IDENTIFIER 0x42535344 + +struct vidtv_s302m_ctx { + struct vidtv_encoder *enc; + + /* whether the F bit was set for the last sub-frame */ + bool last_f; + /* either X or Z */ + u8 last_start_preamble; + /* are we writing an A subframe now? */ + bool is_subframe_a; + /* we send a bit per subframe */ + u8 current_c_bit; +}; + +struct vidtv_smpte_s302m_es { + union { + u32 bitfield; + struct { + u16 audio_packet_size:16; + u16 num_channels:2; + u16 channel_identification:8; + u16 bits_per_sample:2; /* 0x0 for 16bits */ + u16 zero:4; + } __packed; + } __packed; +} __packed; + +struct vidtv_s302m_subframe_16 { +#if defined(__LITTLE_ENDIAN_BITFIELD) + u8 f:1; + u8 c:1; + u8 u:1; + u8 v:1; + u16 data_word:16; /* little endian, use cpu_to_le before writing */ + u8 zero:4; + u8 aux:4; + u8 preamble:4; +#elif defined(__BIG_ENDIAN_BITFIELD) + u8 preamble:4; + u8 aux:4; + u8 zero:4; + u16 data_word:16; /* little endian */ + u8 v:1; + u8 u:1; + u8 c:1; + u8 f:1; +#else +#error "Please fix " +#endif +}__packed; + +struct vidtv_s302m_encoder_init_args { + char *name; + void *src_buf; + u32 src_buf_sz; + u16 es_pid; + struct vidtv_encoder *sync; + u8 access_unit_capacity; + void (*last_sample_cb)(u32 sample_no); + + /* optionally chain to this encoder */ + struct vidtv_encoder *head; +}; + +struct vidtv_encoder +*vidtv_s302m_encoder_init(struct vidtv_s302m_encoder_init_args args); + +void vidtv_s302m_encoder_destroy(struct vidtv_encoder *encoder); + +#endif /* VIDTV_S302M_H */ From patchwork Sat May 2 03:22:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Almeida X-Patchwork-Id: 63514 Received: from vger.kernel.org ([23.128.96.18]) by www.linuxtv.org with esmtp (Exim 4.92) (envelope-from ) id 1jUihI-007NYH-Eb; Sat, 02 May 2020 03:20:14 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727988AbgEBDXX (ORCPT + 1 other); Fri, 1 May 2020 23:23:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40010 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726439AbgEBDXS (ORCPT ); Fri, 1 May 2020 23:23:18 -0400 Received: from mail-qk1-x744.google.com (mail-qk1-x744.google.com [IPv6:2607:f8b0:4864:20::744]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 13332C061A0C; Fri, 1 May 2020 20:23:18 -0700 (PDT) Received: by mail-qk1-x744.google.com with SMTP id q7so11246044qkf.3; Fri, 01 May 2020 20:23:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=+xOTBOsvQTu4yc+0v7el32n7L7VvMv219Y8wnbSHK3U=; b=UZmxtP7WnrYEOZ8wWgYIXKr11fqjVio7AnIYPCj15Ypa0rsVTe/byeAMSTlFCQc/Yx z7BgJRr28zKdQHYUeNo/XwRh7m0MbglMglhPjaO11RvRtmD4atB0ICEchfkoUAChE7cd SuTepK4Rr3Mw89rc5mt3icwRtRYBbHLTm55WxTPCoIx6eqjw+fsbTOqpvC5Qy7wzcgIU I5yX7ccwpopcjPwMp2M3Nud7W3eEPxGvzgOmxnfeuyHVho841QUBBKrY2SPLEZPLzqOj eKQe6ouQGjhCn3nfF+kmvrI9XZYjyiUZjM8hqOyqLJs4G8giO12H9SsR/kNI2kTgWv5n zkpw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=+xOTBOsvQTu4yc+0v7el32n7L7VvMv219Y8wnbSHK3U=; b=Ljtxy1fZZKWfy5YmZdV11nJcrjLsfN98cdwlaUON3O9ZsCzd0GeIh/1sZ7NQFGXzhG EStGDzo8uX55SKZ9SY31ydLLbkTjlg6AJqE9oMYg5L+uR7FBl87R1DZBwmUECcYIa864 XAzNGBLD0uQcxYI2UblM6dPIH4LT6H3hP7iCdHI8Gt3VXXhQaEz4xIKdt8foOk5VipyK qBjlMP/zBSpEq/14sCsq7F1Dn6WFsS7r4M3hGw1+f22LozfnIxPgOLX3R0dBtNy9OAAu dG7h6Ucy7up7/1vq7pc1BtCHNvhRKBhRyfJYW1QoQFa3S3blqMr0nHE6xFR5ECDJomZG 40Cg== X-Gm-Message-State: AGi0PuYJIDDHtiEZ495wy9M7P4MTQyJI6KJu2OAN7yii3v8+sd0VflJ3 /gnEFBYVgACYL9mTN42Jucc= X-Google-Smtp-Source: APiQypJKUTof2DXNlRYjfapsb9dyZWUT6ZSdoz5NyZgKn7ovuFjAemQnrfBWdne1iDRy/FMbBSaCQA== X-Received: by 2002:a37:4d43:: with SMTP id a64mr6719790qkb.491.1588389796782; Fri, 01 May 2020 20:23:16 -0700 (PDT) Received: from localhost.localdomain ([2804:18:602b:723a:1b2a:57a1:a611:34ed]) by smtp.gmail.com with ESMTPSA id c41sm4410399qta.96.2020.05.01.20.23.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 May 2020 20:23:16 -0700 (PDT) From: "Daniel W. S. Almeida" X-Google-Original-From: Daniel W. S. Almeida To: mchehab+huawei@kernel.org, sean@mess.org, kstewart@linuxfoundation.org, allison@lohutok.net, tglx@linutronix.de Cc: "Daniel W. S. Almeida" , linux-media@vger.kernel.org, skhan@linuxfoundation.org, linux-kernel-mentees@lists.linuxfoundation.org, linux-kernel@vger.kernel.org Subject: [RFC, WIP, v4 11/11] media: vidtv: Add a MPEG Transport Stream Multiplexer Date: Sat, 2 May 2020 00:22:16 -0300 Message-Id: <20200502032216.197977-12-dwlsalmeida@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200502032216.197977-1-dwlsalmeida@gmail.com> References: <20200502032216.197977-1-dwlsalmeida@gmail.com> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-LSpam-Score: -2.5 (--) X-LSpam-Report: No, score=-2.5 required=5.0 tests=BAYES_00=-1.9,DKIM_SIGNED=0.1,DKIM_VALID=-0.1,DKIM_VALID_AU=-0.1,FREEMAIL_FORGED_FROMDOMAIN=0.001,FREEMAIL_FROM=0.001,HEADER_FROM_DIFFERENT_DOMAINS=0.5,MAILING_LIST_MULTI=-1 autolearn=ham autolearn_force=no From: "Daniel W. S. Almeida" Add a MPEG Transport Stream multiplexer responsible for polling encoders, interleaving packets, padding the resulting stream with NULL packets if necessary and then delivering the resulting TS packets to the bridge driver so it can feed the demux. This patch includes a "channel" abstraction, which attempts to map a MPEG service into a struct that vidtv can work with. When vidtv boots, it will create some hardcoded channels: -Their services will be concatenated to populate the SDT. -Their programs will be concatenated to populate the PAT -For each program in the PAT, a PMT section will be created -The PMT section for a channel will be assigned its streams. -Every stream will have its corresponding encoder polled to produce TS packets -These packets may be interleaved by the mux and then delivered to the bridg Signed-off-by: Daniel W. S. Almeida --- drivers/media/test-drivers/vidtv/Makefile | 2 +- .../media/test-drivers/vidtv/vidtv_bridge.c | 67 ++- .../media/test-drivers/vidtv/vidtv_bridge.h | 2 + .../media/test-drivers/vidtv/vidtv_channel.c | 326 ++++++++++++++ .../media/test-drivers/vidtv/vidtv_channel.h | 66 +++ .../media/test-drivers/vidtv/vidtv_common.h | 3 + drivers/media/test-drivers/vidtv/vidtv_mux.c | 423 ++++++++++++++++++ drivers/media/test-drivers/vidtv/vidtv_mux.h | 105 +++++ drivers/media/test-drivers/vidtv/vidtv_psi.c | 18 + drivers/media/test-drivers/vidtv/vidtv_psi.h | 5 + 10 files changed, 1014 insertions(+), 3 deletions(-) create mode 100644 drivers/media/test-drivers/vidtv/vidtv_channel.c create mode 100644 drivers/media/test-drivers/vidtv/vidtv_channel.h create mode 100644 drivers/media/test-drivers/vidtv/vidtv_mux.c create mode 100644 drivers/media/test-drivers/vidtv/vidtv_mux.h diff --git a/drivers/media/test-drivers/vidtv/Makefile b/drivers/media/test-drivers/vidtv/Makefile index c916eb19d73bb..a1d29001fffe3 100644 --- a/drivers/media/test-drivers/vidtv/Makefile +++ b/drivers/media/test-drivers/vidtv/Makefile @@ -2,6 +2,6 @@ vidtv_demod-objs := vidtv_common.o vidtv_bridge-objs := vidtv_common.o vidtv_ts.o vidtv_psi.o vidtv_pes.o \ - vidtv_s302m.o + vidtv_s302m.o vidtv_channel.o vidtv_mux.o obj-$(CONFIG_DVB_VIDTV) += vidtv_tuner.o vidtv_demod.o vidtv_bridge.o diff --git a/drivers/media/test-drivers/vidtv/vidtv_bridge.c b/drivers/media/test-drivers/vidtv/vidtv_bridge.c index 05ca4027c869f..c9876372fdebd 100644 --- a/drivers/media/test-drivers/vidtv/vidtv_bridge.c +++ b/drivers/media/test-drivers/vidtv/vidtv_bridge.c @@ -13,8 +13,10 @@ #include #include #include "vidtv_bridge.h" +#include "vidtv_ts.h" +#include "vidtv_mux.h" -#define TS_BUF_MAX_SZ (128 * 188) +#define TS_BUF_MAX_SZ (128 * TS_PACKET_LEN) #define TUNER_DEFAULT_ADDR 0x68 #define DEMOD_DEFAULT_ADDR 0x60 @@ -64,16 +66,63 @@ module_param(chosen_delsys, uint, 0644); MODULE_PARM_DESC(chosen_delsys, "The delivery system to simulate. Currently supported: DVB-T, DVB-C, DVB-S"); -static unsigned int ts_buf_sz = 20 * 188; +static unsigned int ts_buf_sz = 20 * TS_PACKET_LEN; module_param(ts_buf_sz, uint, 0644); MODULE_PARM_DESC(ts_buf_sz, "Optional size for the TS buffer"); DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nums); +/* + * Influences the signal acquisition time. See ISO/IEC 13818-1 : 2000. p. 113. + */ +static unsigned int si_period_msec = 40; +module_param(si_period_msec, uint, 0644); +MODULE_PARM_DESC(si_period_msec, "How often to send SI packets. Default: 40ms"); + +static unsigned int pcr_period_msec = 40; +module_param(pcr_period_msec, uint, 0644); +MODULE_PARM_DESC(pcr_period_msec, "How often to send PCR packets. Default: 40ms"); + +static unsigned int mux_rate_kbytes_sec = 4096; +module_param(mux_rate_kbytes_sec, uint, 0644); +MODULE_PARM_DESC(mux_rate_kbytes_sec, "Optional mux rate: will pad stream if below"); + +static unsigned int pcr_pid = 0x200 +module_param(pcr_pid, uint, 0644); +MODULE_PARM_DESC(pcr_pid, "Optional PCR PID for all channels: defaults to 0x200"); + +static bool vidtv_bridge_check_demod_lock(struct vidtv_dvb *dvb, u32 n) +{ + enum fe_status status; + + dvb->fe[n]->ops.read_status(dvb->fe[n], &status); + + return status == FE_HAS_SIGNAL | + FE_HAS_CARRIER | + FE_HAS_VITERBI | + FE_HAS_SYNC | + FE_HAS_LOCK; +} + +static void +vidtv_bridge_on_new_pkts_avail(void *priv, u8 *buf, u32 npkts) +{ + /* + * called on a separate thread by the mux when new packets become + * available + */ + struct vidtv_dvb *dvb = (struct vidtv_dvb *)priv; + + /* drop packets if we lose the lock */ + if (vidtv_bridge_check_demod_lock(dvb, 0)) + dvb_dmx_swfilter_packets(&dvb->demux, buf, npkts); +} + static int vidtv_start_streaming(struct vidtv_dvb *dvb) { WARN_ON(dvb->streaming); dvb->streaming = true; + vidtv_mux_start_thread(dvb->mux); return 0; } @@ -82,6 +131,7 @@ static int vidtv_stop_streaming(struct vidtv_dvb *dvb) { /* mpeg thread will quit */ dvb->streaming = false; + vidtv_mux_stop_thread(dvb->mux); return 0; } @@ -313,6 +363,7 @@ static int vidtv_bridge_i2c_probe(struct i2c_client *client, { int ret; struct vidtv_dvb *dvb; + struct vidtv_mux_init_args mux_args = {0}; dvb = kzalloc(sizeof(*dvb), GFP_KERNEL); if (!dvb) @@ -324,6 +375,16 @@ static int vidtv_bridge_i2c_probe(struct i2c_client *client, mutex_init(&dvb->feed_lock); + mux_args.mux_rate_kbytes_sec = mux_rate_kbytes_sec; + mux_args.on_new_packets_available_cb = vidtv_bridge_on_new_pkts_avail; + mux_args.ts_buf_sz = ts_buf_sz; + mux_args.pcr_period_usecs = pcr_period_msecs * 1000; + mux_args.si_period_usecs = si_period_msecs * 1000; + mux_args.pcr_pid = pcr_pid; + mux_args.priv = dvb; + + dvb->mux = vidtv_mux_init(mux_args); + i2c_set_clientdata(client, dvb); return ret; @@ -340,6 +401,8 @@ static int vidtv_bridge_i2c_remove(struct i2c_client *client) dvb = i2c_get_clientdata(client); + vidtv_mux_destroy(dvb->mux); + mutex_destroy(&dvb->feed_lock); for (i = 0; i < NUM_FE; ++i) diff --git a/drivers/media/test-drivers/vidtv/vidtv_bridge.h b/drivers/media/test-drivers/vidtv/vidtv_bridge.h index ef5c7cd2d64e3..f5e6931058c9c 100644 --- a/drivers/media/test-drivers/vidtv/vidtv_bridge.h +++ b/drivers/media/test-drivers/vidtv/vidtv_bridge.h @@ -17,6 +17,7 @@ #include #include #include +#include "vidtv_mux.h" struct vidtv_dvb { struct dvb_frontend *fe[NUM_FE]; @@ -32,6 +33,7 @@ struct vidtv_dvb { struct mutex feed_lock; /* start/stop feed */ bool streaming; + struct vidtv_mux *mux; }; #endif // VIDTV_BRIDGE_H diff --git a/drivers/media/test-drivers/vidtv/vidtv_channel.c b/drivers/media/test-drivers/vidtv/vidtv_channel.c new file mode 100644 index 0000000000000..3e89a40eb7ca6 --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_channel.c @@ -0,0 +1,326 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Vidtv serves as a reference DVB driver and helps validate the existing APIs + * in the media subsystem. It can also aid developers working on userspace + * applications. + * + * This file contains the code for a 'channel' abstraction. + * + * When vidtv boots, it will create some hardcoded channels. + * Their services will be concatenated to populate the SDT. + * Their programs will be concatenated to populate the PAT + * For each program in the PAT, a PMT section will be created + * The PMT section for a channel will be assigned its streams. + * Every stream will have its corresponding encoder polled to produce TS packets + * These packets may be interleaved by the mux and then delivered to the bridge + * + * + * Written by Daniel W. S. Almeida + */ + +#include +#include +#include "vidtv_channel.h" +#include "vidtv_psi.h" +#include "vidtv_encoder.h" +#include "vidtv_mux.h" +#include "vidtv_common.h" +#include "vidtv_s302m.h" + +static void vidtv_channel_encoder_destroy(struct vidtv_encoder *e) +{ + struct vidtv_encoder *curr = e; + + while (curr) { + /* forward the call to the derived type */ + curr->destroy(curr); + curr = curr->next; + } +} + +static struct vidtv_channel +*vidtv_channel_s302m_init(struct vidtv_channel *head) +{ + /* init an audio only channel with a s302m encoder */ + const u16 s302m_service_id = 0x880; + const u16 s302m_program_num = 0x880; + const u16 s302m_program_pid = 0x101; /* packet id for PMT*/ + const u16 s302m_es_pid = 0x111; /* packet id for the ES */ + const u16 s302m_pes_audio_stream_id = 0xbd; /* PES: private_stream_1 */ + + struct vidtv_channel *s302m = kzalloc(sizeof(*s302m), GFP_KERNEL); + struct vidtv_psi_table_sdt_service *s302m_service; + struct vidtv_psi_desc_service *s302m_s_desc; + struct vidtv_s302m_encoder_init_args encoder_args = {0}; + + s302m_service = vidtv_psi_sdt_service_init(NULL, s302m_service_id); + + s302m_s_desc = (struct vidtv_psi_desc_service *) + vidtv_psi_desc_init(NULL, + SERVICE_DESCRIPTOR, + sizeof(*s302m_s_desc)); + + s302m_s_desc->name = "Sine Wave PCM Audio"; + s302m_s_desc->service_type = DIGITAL_TELEVISION_SERVICE; + + s302m_s_desc->length = sizeof(s302m_s_desc->service_type) + + strlen(s302m_s_desc->name) + + strlen(s302m_s_desc->name_emph) + + strlen(s302m_s_desc->provider) + + strlen(s302m_s_desc->provider_emph); + + vidtv_psi_desc_assign(&s302m_service->descriptor, + (struct vidtv_psi_desc *) + s302m_s_desc); + + s302m->transport_stream_id = TRANSPORT_STREAM_ID; + + s302m->program = vidtv_psi_pat_program_init(NULL, + s302m_service_id, + s302m_program_pid); + + s302m->program_num = s302m_program_num; + + s302m->streams = vidtv_psi_pmt_stream_init(NULL, + STREAM_PRIVATE_DATA, + s302m_pes_audio_stream_id); + + encoder_args.access_unit_capacity = 16; + encoder_args.es_pid = s302m_es_pid; + + s302m->encoders = vidtv_s302m_encoder_init(encoder_args); + + if (head) { + while (head->next) + head = head->next; + + head->next = s302m; + } + + return s302m; +} + +static struct vidtv_psi_table_sdt_service +*vidtv_channel_sdt_serv_cat_into_new(struct vidtv_channel *channels) +{ + struct vidtv_channel *cur_chnl = channels; + struct vidtv_psi_table_sdt_service *curr = NULL; + struct vidtv_psi_table_sdt_service *head = NULL; + struct vidtv_psi_table_sdt_service *tail = NULL; + u16 service_id; + + while (cur_chnl) { + curr = cur_chnl->service; + service_id = curr->service_id; + + if (!curr) + continue; + + while (curr->next) { + tail = vidtv_psi_sdt_service_init(tail, service_id); + + if (!head) + head = tail; + + curr = curr->next; + } + + cur_chnl = cur_chnl->next; + } + + return head; +} + +static struct vidtv_psi_table_pat_program* +vidtv_channel_pat_prog_cat_into_new(struct vidtv_channel *channels) +{ + struct vidtv_channel *cur_chnl = channels; + struct vidtv_psi_table_pat_program *curr = NULL; + struct vidtv_psi_table_pat_program *head = NULL; + struct vidtv_psi_table_pat_program *tail = NULL; + + while (cur_chnl) { + curr = cur_chnl->program; + + if (!curr) + continue; + + while (curr->next) { + tail = vidtv_psi_pat_program_init(tail, + curr->service_id, + curr->pid); + + if (!head) + head = tail; + + curr = curr->next; + } + + cur_chnl = cur_chnl->next; + } + + return head; +} + +static void +vidtv_channel_pmt_match_sections(struct vidtv_channel *channels, + struct vidtv_psi_table_pmt sections[], + u32 nsections) +{ + struct vidtv_psi_table_pmt *curr_section = NULL; + struct vidtv_channel *cur_chnl = channels; + u32 j; + + while (cur_chnl) { + for (j = 0; j < nsections; ++j) { + curr_section = §ions[j]; + + if (!curr_section) + continue; + + /* we got a match */ + if (curr_section->header.id == cur_chnl->program_num) { + vidtv_psi_pmt_stream_assign(curr_section, + cur_chnl->streams); + break; + } + } + + cur_chnl = cur_chnl->next; + } +} + +void vidtv_channel_si_init(struct vidtv_mux *m) +{ + struct vidtv_psi_table_pat *pat = m->si.pat; + struct vidtv_psi_table_sdt *sdt = m->si.sdt; + + struct vidtv_psi_table_pmt *pmt_sections = m->si.pmt_secs; + + struct vidtv_psi_table_pat_program *programs = NULL; + struct vidtv_psi_table_sdt_service *services = NULL; + + bool update_version_num = false; + + vidtv_psi_pat_table_init(pat, + update_version_num, + TRANSPORT_STREAM_ID); + + vidtv_psi_sdt_table_init(sdt, + update_version_num, + TRANSPORT_STREAM_ID); + + programs = vidtv_channel_pat_prog_cat_into_new(m->channels); + services = vidtv_channel_sdt_serv_cat_into_new(m->channels); + + /* assemble all programs and assign to PAT */ + vidtv_psi_pat_program_assign(pat, programs); + + /* assemble all services and assign to SDT */ + vidtv_psi_sdt_service_assign(sdt, services); + + /* a section for each program_id */ + pmt_sections = kcalloc(pat->programs, + sizeof(struct vidtv_psi_table_pmt), + GFP_KERNEL); + + vidtv_psi_pmt_create_sec_for_each_pat_entry(pat, + pmt_sections); + + vidtv_channel_pmt_match_sections(m->channels, + pmt_sections, + pat->programs); +} + +void vidtv_channel_si_destroy(struct vidtv_mux *m) +{ + u32 i; + + vidtv_psi_pat_table_destroy(m->si.pat); + + for (i = 0; i < m->si.num_pmt_sections; ++i) + vidtv_psi_pmt_table_destroy(&m->si.pmt_secs[i]); + + kfree(m->si.pmt_secs); + vidtv_psi_sdt_table_destroy(m->si.sdt); +} + +void vidtv_channels_init(struct vidtv_mux *m) +{ + /* we only have a single channel for now */ + m->channels = vidtv_channel_s302m_init(NULL); +} + +void vidtv_channels_destroy(struct vidtv_mux *m) +{ + struct vidtv_channel *curr = m->channels; + + while (curr) { + vidtv_psi_sdt_service_destroy(curr->service); + vidtv_psi_pat_program_destroy(curr->program); + vidtv_psi_pmt_stream_destroy(curr->streams); + vidtv_channel_encoder_destroy(curr->encoders); + curr = curr->next; + } +} + +static void +vidtv_channels_add_registration_s302m(struct vidtv_psi_table_pmt *sec) +{ + struct vidtv_psi_desc_registration *s302m_r_desc; + + /* there might be some descriptors there already */ + struct vidtv_psi_desc *parent = sec->descriptor; + + s302m_r_desc = (struct vidtv_psi_desc_registration *) + vidtv_psi_desc_init(parent, + REGISTRATION_DESCRIPTOR, + sizeof(*s302m_r_desc)); + + s302m_r_desc->format_identifier = VIDTV_S302M_FORMAT_IDENTIFIER; + + if (!parent) + vidtv_psi_desc_assign(&sec->descriptor, + (struct vidtv_psi_desc *)s302m_r_desc); + + /* we are adding to the table, so recompute the length */ + vidtv_psi_pmt_table_comp_sec_len(sec); +} + +void vidtv_channels_add_registration_descs(struct vidtv_mux *m) +{ + /* + * Some formats might need a registration descriptor to be recognized. + * S302M needs it, and ffmpeg actually checks for it, so add such + * descriptor at the PMT section that contains the stream + */ + struct vidtv_channel *cur_chnl = m->channels; + struct vidtv_encoder *e = NULL; + struct vidtv_psi_table_pmt *sec = NULL; + + while (cur_chnl) { + e = cur_chnl->encoders; + sec = vidtv_psi_find_pmt_sec(m->si.pmt_secs, + m->si.pat->programs, + cur_chnl->program_num); + + /* bug somewhere */ + WARN_ON(!sec); + if (!sec) + continue; + + while (e) { + switch (e->id) { + case S302M: + vidtv_channels_add_registration_s302m(sec); + break; + default: + break; + } + + e = e->next; + } + + cur_chnl = cur_chnl->next; + } +} diff --git a/drivers/media/test-drivers/vidtv/vidtv_channel.h b/drivers/media/test-drivers/vidtv/vidtv_channel.h new file mode 100644 index 0000000000000..02141c4c732f0 --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_channel.h @@ -0,0 +1,66 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Vidtv serves as a reference DVB driver and helps validate the existing APIs + * in the media subsystem. It can also aid developers working on userspace + * applications. + * + * This file contains the code for a 'channel' abstraction. + * + * When vidtv boots, it will create some hardcoded channels. + * Their services will be concatenated to populate the SDT. + * Their programs will be concatenated to populate the PAT + * For each program in the PAT, a PMT section will be created + * The PMT section for a channel will be assigned its streams. + * Every stream will have its corresponding encoder polled to produce TS packets + * These packets may be interleaved by the mux and then delivered to the bridge + * + * + * Written by Daniel W. S. Almeida + */ + +#ifndef VIDTV_CHANNEL_H +#define VIDTV_CHANNEL_H + +#include +#include "vidtv_psi.h" +#include "vidtv_encoder.h" +#include "vidtv_mux.h" + +struct vidtv_channel { + /* a number to identify the TS, chosen at will */ + u16 transport_stream_id; + + /* will be concatenated into the SDT */ + struct vidtv_psi_table_sdt_service *service; + + /* the link between SDT, PAT and PMT */ + u16 program_num; + + /* + * a single program with one or more streams associated with it. + * Will be concatenated into the PAT + */ + struct vidtv_psi_table_pat_program *program; + + /* + * one or more streams associated with the program + * Will populate the PMT section for this program + */ + struct vidtv_psi_table_pmt_stream *streams; + + /* a list of encoders, one for each stream */ + struct vidtv_encoder *encoders; + + struct vidtv_channel *next; +}; + +/* init SI data from the channels */ +void vidtv_channel_si_init(struct vidtv_mux *m); +void vidtv_channel_si_destroy(struct vidtv_mux *m); + +void vidtv_channels_init(struct vidtv_mux *m); +void vidtv_channels_destroy(struct vidtv_mux *m); + +void vidtv_channels_add_registration_descs(struct vidtv_mux *m); + +#endif //VIDTV_CHANNEL_H diff --git a/drivers/media/test-drivers/vidtv/vidtv_common.h b/drivers/media/test-drivers/vidtv/vidtv_common.h index 170646497eb58..64c85503d4113 100644 --- a/drivers/media/test-drivers/vidtv/vidtv_common.h +++ b/drivers/media/test-drivers/vidtv/vidtv_common.h @@ -14,6 +14,9 @@ #include #define CLOCK_UNIT_90KHZ 90000 +#define CLOCK_UNIT_27MHZ 27000000 +#define SLEEP_USECS 10000 +#define TRANSPORT_STREAM_ID 0x744 u32 vidtv_memcpy(void *to, const void *from, diff --git a/drivers/media/test-drivers/vidtv/vidtv_mux.c b/drivers/media/test-drivers/vidtv/vidtv_mux.c new file mode 100644 index 0000000000000..6d553be27622f --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_mux.c @@ -0,0 +1,423 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Vidtv serves as a reference DVB driver and helps validate the existing APIs + * in the media subsystem. It can also aid developers working on userspace + * applications. + * + * This file contains the multiplexer logic for TS packets from different + * elementary streams + * + * Written by Daniel W. S. Almeida + */ + +#include +#include +#include +#include +#include "vidtv_mux.h" +#include "vidtv_ts.h" +#include "vidtv_pes.h" +#include "vidtv_encoder.h" +#include "vidtv_channel.h" +#include "vidtv_common.h" +#include "vidtv_psi.h" + +static struct vidtv_mux_pid_ctx +*vidtv_mux_get_pid_ctx(struct vidtv_mux *m, u16 pid) +{ + struct vidtv_mux_pid_ctx *ctx; + + hash_for_each_possible(m->pid_ctx, ctx, h, pid) + if (ctx->pid == pid) + return ctx; + + return NULL; +} + +static struct vidtv_mux_pid_ctx +*vidtv_mux_create_pid_ctx_once(struct vidtv_mux *m, u16 pid) +{ + struct vidtv_mux_pid_ctx *ctx; + + ctx = vidtv_mux_get_pid_ctx(m, pid); + + if (ctx) + goto end; + + ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); + ctx->pid = pid; + ctx->cc = 0; + hash_add(m->pid_ctx, &ctx->h, pid); + +end: + return ctx; +} + +static void vidtv_mux_pid_ctx_init(struct vidtv_mux *m) +{ + struct vidtv_psi_table_pat_program *p = m->si.pat->program; + + hash_init(m->pid_ctx); + /* push the pcr pid ctx */ + vidtv_mux_create_pid_ctx_once(m, m->pcr_pid); + /* push the null packet pid ctx */ + vidtv_mux_create_pid_ctx_once(m, TS_NULL_PACKET_PID); + /* push the PAT pid ctx */ + vidtv_mux_create_pid_ctx_once(m, VIDTV_PAT_PID); + /* push the SDT pid ctx */ + vidtv_mux_create_pid_ctx_once(m, VIDTV_SDT_PID); + + /* add a ctx for all PMT sections */ + while (p) { + vidtv_mux_create_pid_ctx_once(m, p->pid); + p = p->next; + } +} + +static void vidtv_mux_pid_ctx_destroy(struct vidtv_mux *m) +{ + int bkt; + struct vidtv_mux_pid_ctx *ctx; + + hash_for_each(m->pid_ctx, bkt, ctx, h) { + kfree(ctx); + } +} + +static void vidtv_mux_update_clk(struct vidtv_mux *m) +{ + /* call this at every thread iteration */ + u64 elapsed_time; + + /* this will not hold a value yet if we have just started */ + m->timing.past_jiffies = m->timing.current_jiffies ? + m->timing.current_jiffies : + get_jiffies_64(); + + m->timing.current_jiffies = get_jiffies_64(); + + elapsed_time = jiffies_to_usecs(m->timing.current_jiffies - + m->timing.past_jiffies); + + /* update the 27Mhz clock proportionally to the elapsed time */ + m->timing.clk += (CLOCK_UNIT_27MHZ / USEC_PER_SEC) * elapsed_time; +} + +static u32 vidtv_mux_push_si(struct vidtv_mux *m) +{ + u32 initial_offset = m->ts_buf_offset; + struct vidtv_mux_pid_ctx *pat_ctx, *pmt_ctx, *sdt_ctx; + u32 nbytes; /* the number of bytes written by this function */ + u16 pmt_pid; + u32 i; + + pat_ctx = vidtv_mux_get_pid_ctx(m, VIDTV_PAT_PID); + sdt_ctx = vidtv_mux_get_pid_ctx(m, VIDTV_SDT_PID); + + m->ts_buf_offset += vidtv_psi_pat_write_into(m->ts_buf, + m->ts_buf_offset, + m->si.pat, + m->ts_buf_sz, + &pat_ctx->cc); + + for (i = 0; i < m->si.num_pmt_sections; ++i) { + pmt_pid = vidtv_psi_pmt_get_pid(&m->si.pmt_secs[i], + m->si.pat); + + /* not found */ + WARN_ON(pmt_pid > TS_LAST_VALID_PID); + if (pmt_pid > TS_LAST_VALID_PID) + continue; + + pmt_ctx = vidtv_mux_get_pid_ctx(m, pmt_pid); + + /* write each section into buffer */ + m->ts_buf_offset += vidtv_psi_pmt_write_into(m->ts_buf, + m->ts_buf_offset, + &m->si.pmt_secs[i], + pmt_pid, + m->ts_buf_sz, + &pmt_ctx->cc); + } + + m->ts_buf_offset += vidtv_psi_sdt_write_into(m->ts_buf, + m->ts_buf_offset, + m->si.sdt, + m->ts_buf_sz, + &sdt_ctx->cc); + + nbytes = m->ts_buf_offset - initial_offset; + return nbytes; +} + +static u32 vidtv_mux_push_pcr(struct vidtv_mux *m) +{ + struct pcr_write_args args = {0}; + struct vidtv_mux_pid_ctx *ctx; + + ctx = vidtv_mux_get_pid_ctx(m, m->pcr_pid); + args.dest_buf = m->ts_buf; + args.pid = m->pcr_pid; + args.buf_sz = m->ts_buf_sz; + args.continuity_counter = &ctx->cc; + + /* the 27Mhz clock will feed both parts of the PCR bitfield */ + args.pcr = m->timing.clk; + + return vidtv_ts_pcr_write_into(args); +} + +static bool vidtv_mux_should_push_pcr(struct vidtv_mux *m) +{ + u64 next_pcr_at; + + next_pcr_at = m->timing.start_jiffies + + usecs_to_jiffies(m->num_streamed_pcr * + m->timing.pcr_period_usecs); + + return time_after64(m->timing.current_jiffies, next_pcr_at); +} + +static bool vidtv_mux_should_push_si(struct vidtv_mux *m) +{ + u64 next_si_at; + + next_si_at = m->timing.start_jiffies + + usecs_to_jiffies(m->num_streamed_si * + m->timing.si_period_usecs); + + return time_after64(m->timing.current_jiffies, next_si_at); +} + +static u32 vidtv_mux_packetize_access_units(struct vidtv_mux *m, + struct vidtv_encoder *e) +{ + /* the number of bytes written by this function */ + u32 nbytes = 0; + struct pes_write_args args = {0}; + u32 initial_offset = m->ts_buf_offset; + + u32 i; + u8 *buf; + struct vidtv_mux_pid_ctx *pid_ctx; + + pid_ctx = vidtv_mux_create_pid_ctx_once(m, e->es_pid); + + args.dest_buf = m->ts_buf; + args.dest_buf_sz = m->ts_buf_sz; + args.pid = e->es_pid; + args.is_s302m_pkt = (e->id == S302M); + args.continuity_counter = &pid_ctx->cc; + args.send_pts = true; + + for (i = 0; i < e->nunits; ++i) { + buf = e->encoder_buf + e->offsets[i]; + args.from = buf; + args.access_unit_len = e->nbytes[i]; + args.dest_offset = m->ts_buf_offset; + args.pts = e->pts[i]; + + m->ts_buf_offset += vidtv_pes_write_into(args); + } + + /* clear the encoder state once we have written the current ES data */ + e->clear(e); + + nbytes = m->ts_buf_offset - initial_offset; + return nbytes; +} + +static u32 vidtv_mux_poll_encoders(struct vidtv_mux *m) +{ + u32 nbytes = 0; + struct vidtv_channel *cur_chnl = m->channels; + struct vidtv_encoder *e = NULL; + + u64 elapsed_time_usecs = jiffies_to_usecs(m->timing.current_jiffies - + m->timing.past_jiffies); + while (cur_chnl) { + e = cur_chnl->encoders; + + while (e) { + /* encode for 'elapsed_time_usecs' */ + e->encode(e, elapsed_time_usecs); + /* get the TS packets into the mux buffer */ + nbytes += vidtv_mux_packetize_access_units(m, e); + /* grab next encoder */ + e = e->next; + } + + /* grab the next channel */ + cur_chnl = cur_chnl->next; + } + + return nbytes; +} + +static u32 vidtv_mux_pad_with_nulls(struct vidtv_mux *m, u32 npkts) +{ + struct null_packet_write_args args = {0}; + u32 initial_offset = m->ts_buf_offset; + u32 nbytes; /* the number of bytes written by this function */ + u32 i; + struct vidtv_mux_pid_ctx *ctx; + + ctx = vidtv_mux_get_pid_ctx(m, TS_NULL_PACKET_PID); + + args.dest_buf = m->ts_buf; + args.buf_sz = m->ts_buf_sz; + args.continuity_counter = &ctx->cc; + args.dest_offset = m->ts_buf_offset; + + for (i = 0; i < npkts; ++i) { + m->ts_buf_offset += vidtv_ts_null_write_into(args); + args.dest_offset = m->ts_buf_offset; + } + + nbytes = m->ts_buf_offset - initial_offset; + + /* sanity check */ + WARN_ON(nbytes != npkts * TS_PACKET_LEN); + + return nbytes; +} + +static u32 vidtv_mux_check_mux_rate(struct vidtv_mux *m) +{ + /* + * attempt to maintain a constant mux rate, padding with null packets + * if needed + */ + + u32 nbytes = 0; /* the number of bytes written by this function */ + + u64 nbytes_expected; /* the number of bytes we should have written */ + u64 nbytes_streamed; /* the number of bytes we actually wrote */ + u32 num_null_pkts; /* number of null packets to bridge the gap */ + + u64 elapsed_time_usecs = jiffies_to_usecs(m->timing.current_jiffies - + m->timing.past_jiffies); + + nbytes_expected = (m->mux_rate_kbytes_sec / 1000) / USEC_PER_SEC; + nbytes_expected *= elapsed_time_usecs; + + nbytes_streamed = m->num_streamed_pkts * TS_PACKET_LEN; + + if (nbytes_streamed < nbytes_expected) { + /* can't write half a packet: roundup to a 188 multiple */ + nbytes_expected = roundup(nbytes_expected, TS_PACKET_LEN); + num_null_pkts = nbytes_expected / TS_PACKET_LEN; + nbytes += vidtv_mux_pad_with_nulls(m, num_null_pkts); + } + + return nbytes; +} + +static void vidtv_mux_clear(struct vidtv_mux *m) +{ + /* clear the packets currently in the mux */ + memset(m->ts_buf, 0, m->ts_buf_sz); + /* point to the beginning of the buffer again */ + m->ts_buf_offset = 0; +} + +static void vidtv_mux_tick(struct work_struct *work) +{ + struct vidtv_mux *m = container_of(work, + struct vidtv_mux, + mpeg_thread); + u32 nbytes; + u32 npkts; + + while (m->streaming) { + nbytes = 0; + + vidtv_mux_update_clk(m); + + if (vidtv_mux_should_push_pcr(m)) + nbytes += vidtv_mux_push_pcr(m); + + if (vidtv_mux_should_push_si(m)) + nbytes += vidtv_mux_push_si(m); + + nbytes += vidtv_mux_poll_encoders(m); + + nbytes += vidtv_mux_check_mux_rate(m); + + npkts = nbytes / TS_PACKET_LEN; + /* if the buffer is not aligned there is a bug somewhere */ + WARN_ON(nbytes % TS_PACKET_LEN); + + if (m->on_new_packets_available_cb) + m->on_new_packets_available_cb(m->priv, + m->ts_buf, + npkts); + + m->num_streamed_pkts += npkts; + vidtv_mux_clear(m); + + usleep_range(SLEEP_USECS, 2 * SLEEP_USECS); + } +} + +void vidtv_mux_start_thread(struct vidtv_mux *m) +{ + WARN_ON(m->streaming); + + if (m->streaming) + return; + + m->streaming = true; + m->timing.start_jiffies = get_jiffies_64(); + schedule_work(&m->mpeg_thread); +} + +void vidtv_mux_stop_thread(struct vidtv_mux *m) +{ + /* thread will quit */ + m->streaming = false; +} + +struct vidtv_mux *vidtv_mux_init(struct vidtv_mux_init_args args) +{ + struct vidtv_mux *m = kzalloc(sizeof(*m), GFP_KERNEL); + + m->timing.pcr_period_usecs = args.pcr_period_usecs; + m->timing.si_period_usecs = args.si_period_usecs; + + m->mux_rate_kbytes_sec = args.mux_rate_kbytes_sec; + + m->on_new_packets_available_cb = args.on_new_packets_available_cb; + + m->ts_buf = vmalloc(args.ts_buf_sz); + m->ts_buf_sz = args.ts_buf_sz; + + m->si.pat = kzalloc(sizeof(*m->si.pat), GFP_KERNEL); + m->si.sdt = kzalloc(sizeof(*m->si.sdt), GFP_KERNEL); + + vidtv_channels_init(m); + + /* will alloc data for pmt_sections after initializing pat */ + vidtv_channel_si_init(m); + + INIT_WORK(&m->mpeg_thread, vidtv_mux_tick); + + m->pcr_pid = args.pcr_pid; + m->priv = args.priv; + + vidtv_mux_pid_ctx_init(m); + vidtv_channels_add_registration_descs(m); + + return m; +} + +void vidtv_mux_destroy(struct vidtv_mux *m) +{ + vidtv_mux_pid_ctx_destroy(m); + vidtv_channel_si_destroy(m); + vidtv_channels_destroy(m); + kfree(m->si.sdt); + kfree(m->si.pat); + vfree(m->ts_buf); + kfree(m); +} diff --git a/drivers/media/test-drivers/vidtv/vidtv_mux.h b/drivers/media/test-drivers/vidtv/vidtv_mux.h new file mode 100644 index 0000000000000..1dffa2010d518 --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_mux.h @@ -0,0 +1,105 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Vidtv serves as a reference DVB driver and helps validate the existing APIs + * in the media subsystem. It can also aid developers working on userspace + * applications. + * + * This file contains the multiplexer logic for TS packets from different + * elementary streams + * + * Written by Daniel W. S. Almeida + */ + +#ifndef VIDTV_MUX_H +#define VIDTV_MUX_H + +#include +#include +#include +#include "vidtv_psi.h" +struct vidtv_mux_timing { + u64 start_jiffies; + u64 current_jiffies; + u64 past_jiffies; + + /* a 27Mhz clock from which we will drive the PCR */ + u64 clk; + + u64 pcr_period_usecs; + u64 si_period_usecs; +}; + +struct vidtv_mux_si { + /* the SI tables */ + struct vidtv_psi_table_pat *pat; + struct vidtv_psi_table_pmt *pmt_secs; /* the PMT sections */ + /* as many sections as programs in the PAT */ + u16 num_pmt_sections; + struct vidtv_psi_table_sdt *sdt; +}; + +struct vidtv_mux_pid_ctx { + u16 pid; + u8 cc; /* continuity counter */ + struct hlist_node h; +}; + +struct vidtv_mux { + struct vidtv_mux_timing timing; + + /* the bit rate for the TS, in kbytes */ + u32 mux_rate_kbytes_sec; + + /* a hash table to keep track of per-PID metadata */ + DECLARE_HASHTABLE(pid_ctx, 3); + + /* a callback to inform of new TS packets ready */ + void (*on_new_packets_available_cb)(void *priv, u8 *buf, u32 npackets); + + /* the TS buffer */ + u8 *ts_buf; + + /* the TS buffer size */ + u32 ts_buf_sz; + + /* where we are in the TS buffer now */ + u32 ts_buf_offset; + + /* a list of channels */ + struct vidtv_channel *channels; + + struct vidtv_mux_si si; + u64 num_streamed_pcr; + u64 num_streamed_si; + + /* total number of packets streamed */ + u64 num_streamed_pkts; + + struct work_struct mpeg_thread; + + /* whether to keep running the main loop */ + bool streaming; + + /* the pcr PID for _all_ channels */ + u16 pcr_pid; + + void *priv; +}; + +struct vidtv_mux_init_args { + u32 mux_rate_kbytes_sec; + void (*on_new_packets_available_cb)(void *priv, u8 *buf, u32 npackets); + u32 ts_buf_sz; + u64 pcr_period_usecs; + u64 si_period_usecs; + u16 pcr_pid; + void *priv; +}; + +struct vidtv_mux *vidtv_mux_init(struct vidtv_mux_init_args args); +void vidtv_mux_destroy(struct vidtv_mux *m); + +void vidtv_mux_start_thread(struct vidtv_mux *m); +void vidtv_mux_stop_thread(struct vidtv_mux *m); + +#endif //VIDTV_MUX_H diff --git a/drivers/media/test-drivers/vidtv/vidtv_psi.c b/drivers/media/test-drivers/vidtv/vidtv_psi.c index 191d37a248923..ac7a52f03843a 100644 --- a/drivers/media/test-drivers/vidtv/vidtv_psi.c +++ b/drivers/media/test-drivers/vidtv/vidtv_psi.c @@ -1135,3 +1135,21 @@ vidtv_psi_pmt_create_sec_for_each_pat_entry(struct vidtv_psi_table_pat *pat, program = program->next; } } + +struct vidtv_psi_table_pmt +*vidtv_psi_find_pmt_sec(struct vidtv_psi_table_pmt pmt_sections[], + u16 nsections, + u16 program_num) +{ + /* find the PMT section associated with 'program_num' */ + struct vidtv_psi_table_pmt *sec = NULL; + u32 i; + + for (i = 0; i < nsections; ++i) { + sec = &pmt_sections[i]; + if (sec->header.id == program_num) + return sec; + } + + return NULL; +} diff --git a/drivers/media/test-drivers/vidtv/vidtv_psi.h b/drivers/media/test-drivers/vidtv/vidtv_psi.h index c5c8c143f0e4a..7aa502b89a2e2 100644 --- a/drivers/media/test-drivers/vidtv/vidtv_psi.h +++ b/drivers/media/test-drivers/vidtv/vidtv_psi.h @@ -354,4 +354,9 @@ u32 vidtv_psi_pmt_write_into(char *buf, u32 buf_sz, u8 *continuity_counter); +struct vidtv_psi_table_pmt +*vidtv_psi_find_pmt_sec(struct vidtv_psi_table_pmt *pmt_sections, + u16 nsections, + u16 program_num); + #endif // VIDTV_PSI_H