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[RFC,v3,1/2] media: docs-rst: Append HEVC specific term

Message ID 20220327084308.9053-2-sebastian.fricke@collabora.com (mailing list archive)
State RFC
Delegated to: Hans Verkuil
Headers
Series HEVC enhancements |

Commit Message

sebastian.fricke@collabora.com March 27, 2022, 8:43 a.m. UTC 
  Describe the coding tree unit as replacement for the macroblock in the
HEVC codec. Highlight a key difference of the HEVC codec to predecessors
like AVC(H.264) to give a better overview of the differences between the
coding standards.

Signed-off-by: Sebastian Fricke <sebastian.fricke@collabora.com>
---
 Documentation/userspace-api/media/v4l/dev-decoder.rst | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

Comments

Jernej Škrabec March 28, 2022, 5:10 p.m. UTC | #1 
Dne nedelja, 27. marec 2022 ob 10:43:08 CEST je Sebastian Fricke napisal(a):
> Describe the coding tree unit as replacement for the macroblock in the
> HEVC codec. Highlight a key difference of the HEVC codec to predecessors
> like AVC(H.264) to give a better overview of the differences between the
> coding standards.
> 

Looks good to me.

Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>

Best regards,
Jernej

> Signed-off-by: Sebastian Fricke <sebastian.fricke@collabora.com>
> ---
>  Documentation/userspace-api/media/v4l/dev-decoder.rst | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/userspace-api/media/v4l/dev-decoder.rst
> b/Documentation/userspace-api/media/v4l/dev-decoder.rst index
> 3cf2b496f2d0..eb5b1b1e3a51 100644
> --- a/Documentation/userspace-api/media/v4l/dev-decoder.rst
> +++ b/Documentation/userspace-api/media/v4l/dev-decoder.rst
> @@ -72,6 +72,11 @@ coded resolution
>  coded width
>     width for given coded resolution.
> 
> +coding tree unit
> +   processing unit of the HEVC codec (≘ macroblock units in H.264, VP8,
> VP9); +   can use block structures of up to 64×64 pixels;
> +   Good at sub-partitioning the picture into variable sized structures.
> +
>  decode order
>     the order in which frames are decoded; may differ from display order if
> the coded format includes a feature of frame reordering; for decoders, @@
> -104,7 +109,8 @@ keyframe
>  macroblock
>     a processing unit in image and video compression formats based on linear
> block transforms (e.g. H.264, VP8, VP9); codec-specific, but for most of - 
>  popular codecs the size is 16x16 samples (pixels).
> +   popular codecs the size is 16x16 samples (pixels). The HEVC codec uses a
> +   slightly more flexible processing unit called coding tree unit (CTU).
> 
>  OUTPUT
>     the source buffer queue; for decoders, the queue of buffers containing
diff mbox series

Patch

diff --git a/Documentation/userspace-api/media/v4l/dev-decoder.rst b/Documentation/userspace-api/media/v4l/dev-decoder.rst
index 3cf2b496f2d0..eb5b1b1e3a51 100644
--- a/Documentation/userspace-api/media/v4l/dev-decoder.rst
+++ b/Documentation/userspace-api/media/v4l/dev-decoder.rst
@@ -72,6 +72,11 @@  coded resolution
 coded width
    width for given coded resolution.
 
+coding tree unit
+   processing unit of the HEVC codec (≘ macroblock units in H.264, VP8, VP9);
+   can use block structures of up to 64×64 pixels;
+   Good at sub-partitioning the picture into variable sized structures.
+
 decode order
    the order in which frames are decoded; may differ from display order if the
    coded format includes a feature of frame reordering; for decoders,
@@ -104,7 +109,8 @@  keyframe
 macroblock
    a processing unit in image and video compression formats based on linear
    block transforms (e.g. H.264, VP8, VP9); codec-specific, but for most of
-   popular codecs the size is 16x16 samples (pixels).
+   popular codecs the size is 16x16 samples (pixels). The HEVC codec uses a
+   slightly more flexible processing unit called coding tree unit (CTU).
 
 OUTPUT
    the source buffer queue; for decoders, the queue of buffers containing