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media: videodev2.h: Add request_fd field to v4l2_buffer

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When queuing buffers allow for passing the request that should
be associated with this buffer.

If V4L2_BUF_FLAG_REQUEST_FD is set, then request_fd is used as
the file descriptor.

If a buffer is stored in a request, but not yet queued to the
driver, then V4L2_BUF_FLAG_IN_REQUEST is set.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Hans Verkuil 2018-05-21 04:54:44 -04:00 • committed by Mauro Carvalho Chehab
parent 55028695c3
commit 62fed26ff4
5 changed files with 19 additions and 8 deletions
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10
include/uapi/linux/videodev2.h
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@ -917,6 +917,7 @@ struct v4l2_plane {
* @length: size in bytes of the buffer (NOT its payload) for single-plane
* buffers (when type != *_MPLANE); number of elements in the
* planes array for multi-plane buffers
* @request_fd: fd of the request that this buffer should use
*
* Contains data exchanged by application and driver using one of the Streaming
* I/O methods.
@ -941,7 +942,10 @@ struct v4l2_buffer {
} m;
__u32 length;
__u32 reserved2;
__u32 reserved;
union {
__s32 request_fd;
__u32 reserved;
};
};
/* Flags for 'flags' field */
@ -959,6 +963,8 @@ struct v4l2_buffer {
#define V4L2_BUF_FLAG_BFRAME 0x00000020
/* Buffer is ready, but the data contained within is corrupted. */
#define V4L2_BUF_FLAG_ERROR 0x00000040
/* Buffer is added to an unqueued request */
#define V4L2_BUF_FLAG_IN_REQUEST 0x00000080
/* timecode field is valid */
#define V4L2_BUF_FLAG_TIMECODE 0x00000100
/* Buffer is prepared for queuing */
@ -977,6 +983,8 @@ struct v4l2_buffer {
#define V4L2_BUF_FLAG_TSTAMP_SRC_SOE 0x00010000
/* mem2mem encoder/decoder */
#define V4L2_BUF_FLAG_LAST 0x00100000
/* request_fd is valid */
#define V4L2_BUF_FLAG_REQUEST_FD 0x00800000
/**
* struct v4l2_exportbuffer - export of video buffer as DMABUF file descriptor