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| author | Ezequiel Garcia <ezequiel@collabora.com> | 2019-08-16 19:01:25 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2019-08-19 19:23:12 +0300 |
| commit | 8cae93e090113e46bd29a99c1727d8f13ea12fdf (patch) | |
| tree | 14bd89209cf54424272a7b1100f6765985ed7dca /Documentation/media/uapi/v4l/pixfmt-compressed.rst | |
| parent | 5604be66a56867a784e162299a48c214921ffa1b (diff) | |
| download | linux-8cae93e090113e46bd29a99c1727d8f13ea12fdf.tar.xz | |
media: uapi: h264: Add the concept of start code
Stateless decoders have different expectations about the
start code that is prepended on H264 slices. Add a
menu control to express the supported start code types
(including no start code).
Drivers are allowed to support only one start code type,
but they can support both too.
Note that this is independent of the H264 decoding mode,
which specifies the granularity of the decoding operations.
Either in frame-based or slice-based mode, this new control
will allow to define the start code expected on H264 slices.
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Diffstat (limited to 'Documentation/media/uapi/v4l/pixfmt-compressed.rst')
| -rw-r--r-- | Documentation/media/uapi/v4l/pixfmt-compressed.rst | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/Documentation/media/uapi/v4l/pixfmt-compressed.rst b/Documentation/media/uapi/v4l/pixfmt-compressed.rst index d666eb51741a..493b6020107d 100644 --- a/Documentation/media/uapi/v4l/pixfmt-compressed.rst +++ b/Documentation/media/uapi/v4l/pixfmt-compressed.rst @@ -60,8 +60,9 @@ Compressed Formats extracted from the H264 bitstream. This format is adapted for stateless video decoders that implement an H264 pipeline (using the :ref:`mem2mem` and :ref:`media-request-api`). - This pixelformat has a modifier that must be set at least once - through the ``V4L2_CID_MPEG_VIDEO_H264_DECODE_MODE`` control. + This pixelformat has two modifiers that must be set at least once + through the ``V4L2_CID_MPEG_VIDEO_H264_DECODE_MODE`` + and ``V4L2_CID_MPEG_VIDEO_H264_START_CODE`` controls. In addition, metadata associated with the frame to decode are required to be passed through the ``V4L2_CID_MPEG_VIDEO_H264_SPS``, ``V4L2_CID_MPEG_VIDEO_H264_PPS``, |