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This flag needs to be used when header mode is set to V4L2_MPEG_VIDEO_HEADER_MODE_SEPARATE. Signed-off-by: Ming Qian --- Documentation/userspace-api/media/v4l/buffer.rst | 11 +++++++++++ .../userspace-api/media/v4l/ext-ctrls-codec.rst | 10 +++++++--- include/uapi/linux/videodev2.h | 2 ++ 3 files changed, 20 insertions(+), 3 deletions(-) diff --git a/Documentation/userspace-api/media/v4l/buffer.rst b/Documentation/userspace-api/media/v4l/buffer.rst index 4638ec64db00..18a6f5fcc822 100644 --- a/Documentation/userspace-api/media/v4l/buffer.rst +++ b/Documentation/userspace-api/media/v4l/buffer.rst @@ -607,6 +607,17 @@ Buffer Flags the format. Any subsequent call to the :ref:`VIDIOC_DQBUF ` ioctl will not block anymore, but return an ``EPIPE`` error code. + * .. _`V4L2-BUF-FLAG-HEADERS-ONLY`: + + - ``V4L2_BUF_FLAG_HEADERS_ONLY`` + - 0x00200000 + - This flag may be set when the buffer only contains codec + header, but does not contain any frame data. Usually the codec + header is merged to the next idr frame, with the flag + ``V4L2_BUF_FLAG_KEYFRAME``, but there is still some scenes that will + split the header and queue it separately. This flag can set only when + codec support V4L2_MPEG_VIDEO_HEADER_MODE_SEPARATE, + and the header mode is set to V4L2_MPEG_VIDEO_HEADER_MODE_SEPARATE * .. _`V4L2-BUF-FLAG-REQUEST-FD`: - ``V4L2_BUF_FLAG_REQUEST_FD`` diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst index 6183f43f4d73..478b6af4205d 100644 --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst @@ -1386,8 +1386,12 @@ enum v4l2_mpeg_video_intra_refresh_period_type - (enum) enum v4l2_mpeg_video_header_mode - - Determines whether the header is returned as the first buffer or is - it returned together with the first frame. Applicable to encoders. + Determines whether the header is returned as the first buffer + with flag V4L2_BUF_FLAG_HEADERS_ONLY or is + it returned together with the first frame. + Applicable to encoders and decoders. + If it's not implemented in a driver, + V4L2_MPEG_VIDEO_HEADER_MODE_JOINED_WITH_1ST_FRAME is to be assumed, Possible values are: .. raw:: latex @@ -1401,7 +1405,7 @@ enum v4l2_mpeg_video_header_mode - :stub-columns: 0 * - ``V4L2_MPEG_VIDEO_HEADER_MODE_SEPARATE`` - - The stream header is returned separately in the first buffer. + - The stream header is returned separately in the first buffer with the flag V4L2_BUF_FLAG_HEADERS_ONLY. * - ``V4L2_MPEG_VIDEO_HEADER_MODE_JOINED_WITH_1ST_FRAME`` - The stream header is returned together with the first encoded frame. diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h index 5311ac4fde35..6fd96acd6080 100644 --- a/include/uapi/linux/videodev2.h +++ b/include/uapi/linux/videodev2.h @@ -1131,6 +1131,8 @@ static inline __u64 v4l2_timeval_to_ns(const struct timeval *tv) #define V4L2_BUF_FLAG_TSTAMP_SRC_SOE 0x00010000 /* mem2mem encoder/decoder */ #define V4L2_BUF_FLAG_LAST 0x00100000 +/* Buffer only contains codec header */ +#define V4L2_BUF_FLAG_HEADERS_ONLY 0x00200000 /* request_fd is valid */ #define V4L2_BUF_FLAG_REQUEST_FD 0x00800000