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Diffstat (limited to 'Documentation/media/uapi/v4l/ext-ctrls-codec.rst')
| -rw-r--r-- | Documentation/media/uapi/v4l/ext-ctrls-codec.rst | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/Documentation/media/uapi/v4l/ext-ctrls-codec.rst b/Documentation/media/uapi/v4l/ext-ctrls-codec.rst index 1da17a2c94d7..810ae9bb6f7c 100644 --- a/Documentation/media/uapi/v4l/ext-ctrls-codec.rst +++ b/Documentation/media/uapi/v4l/ext-ctrls-codec.rst @@ -2076,6 +2076,39 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type - The OUTPUT buffer must contain all slices needed to decode the frame. The OUTPUT buffer must also contain both fields. +``V4L2_CID_MPEG_VIDEO_H264_START_CODE (enum)`` + Specifies the H264 slice start code expected for each slice. + This control is used as a modifier for V4L2_PIX_FMT_H264_SLICE + pixel format. Applications that support V4L2_PIX_FMT_H264_SLICE + are required to set this control in order to specify the start code + that is expected for the buffer. + Drivers may expose a single or multiple start codes, depending + on what they can support. + + .. note:: + + This menu control is not yet part of the public kernel API and + it is expected to change. + +.. c:type:: v4l2_mpeg_video_h264_start_code + +.. cssclass:: longtable + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + :widths: 1 1 2 + + * - ``V4L2_MPEG_VIDEO_H264_START_CODE_NONE`` + - 0 + - Selecting this value specifies that H264 slices are passed + to the driver without any start code. + * - ``V4L2_MPEG_VIDEO_H264_START_CODE_ANNEX_B`` + - 1 + - Selecting this value specifies that H264 slices are expected + to be prefixed by Annex B start codes. According to :ref:`h264` + valid start codes can be 3-bytes 0x000001 or 4-bytes 0x00000001. + .. _v4l2-mpeg-mpeg2: ``V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS (struct)`` |