| Message ID | 20220327084308.9053-2-sebastian.fricke@collabora.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | HEVC enhancements | expand |
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 --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
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(-)