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media: docs-rst: Append HEVC specific term

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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.

[hverkuil: replaced the 'corresponds to' symbol with the full text for clarity]

Signed-off-by: Sebastian Fricke <sebastian.fricke@collabora.com>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Sebastian Fricke 2022-03-29 08:56:56 +02:00 committed by Mauro Carvalho Chehab
parent 6a5446f97b
commit 87581a9ef5
1 changed files with 8 additions and 1 deletions
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9
Documentation/userspace-api/media/v4l/dev-decoder.rst
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@ -72,6 +72,12 @@ coded resolution
coded width
width for given coded resolution.
coding tree unit
processing unit of the HEVC codec (corresponds to 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 +110,8 @@ 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