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authorSebastian Fricke <sebastian.fricke@collabora.com>2022-03-29 09:56:56 +0300
committerMauro Carvalho Chehab <mchehab@kernel.org>2022-05-13 12:02:19 +0300
commit87581a9ef5616b903a3d0edab0eae77c266d1e38 (patch)
tree61c5659abaa46826b09e9282d8c067484db4f696 /Documentation/userspace-api
parent6a5446f97b1c3add10d371590e7b09157f3c96fc (diff)
downloadlinux-87581a9ef5616b903a3d0edab0eae77c266d1e38.tar.xz
media: docs-rst: Append HEVC specific term
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>
Diffstat (limited to 'Documentation/userspace-api')
-rw-r--r--Documentation/userspace-api/media/v4l/dev-decoder.rst9
1 files changed, 8 insertions, 1 deletions
diff --git a/Documentation/userspace-api/media/v4l/dev-decoder.rst b/Documentation/userspace-api/media/v4l/dev-decoder.rst
index 3cf2b496f2d0..675bc2c3c6b8 100644
--- a/Documentation/userspace-api/media/v4l/dev-decoder.rst
+++ b/Documentation/userspace-api/media/v4l/dev-decoder.rst
@@ -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