On 01/22/2015 12:28 PM, Philipp Zabel wrote:
> From: Peter Seiderer <ps.report@xxxxxxx>
>
> This v4l2_buffer flag can be used by drivers to mark a capture buffer
> as the last generated buffer, for example after a V4L2_DEC_CMD_STOP
> command was issued.
>
> Signed-off-by: Peter Seiderer <ps.report@xxxxxxx>
> Signed-off-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
> ---
> include/uapi/linux/videodev2.h | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index fbdc360..c642c10 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -809,6 +809,8 @@ struct v4l2_buffer {
> #define V4L2_BUF_FLAG_TSTAMP_SRC_MASK 0x00070000
> #define V4L2_BUF_FLAG_TSTAMP_SRC_EOF 0x00000000
> #define V4L2_BUF_FLAG_TSTAMP_SRC_SOE 0x00010000
> +/* mem2mem encoder/decoder */
> +#define V4L2_BUF_FLAG_LAST 0x00100000
>
> /**
> * struct v4l2_exportbuffer - export of video buffer as DMABUF file descriptor
>
You probably knew this, but this should of course be documented in the V4L2
spec. In particular the spec should be clear about *when* the flag is set.
Also, any drivers that need this should be updated as well. Otherwise applications
cannot rely on it.
Regards,
Hans
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