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| author | Philipp Zabel <p.zabel@pengutronix.de> | 2015-05-04 07:51:06 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2015-05-12 03:53:06 -0300 |
| commit | c16218402a000bb25c1277c43ae98c11bcb59bd1 (patch) | |
| tree | cccdee965d974306a2ad6e67aeb0cc0ae356bc40 /include/media/videobuf2-core.h | |
| parent | dc199241624a2fd85d9b0d8303babd60feadd0e6 (diff) | |
| download | linux-c16218402a000bb25c1277c43ae98c11bcb59bd1.tar.gz linux-c16218402a000bb25c1277c43ae98c11bcb59bd1.tar.bz2 linux-c16218402a000bb25c1277c43ae98c11bcb59bd1.zip | |
[media] videobuf2: return -EPIPE from DQBUF after the last buffer
If the last buffer was dequeued from a capture queue, let poll return
immediately and let DQBUF return -EPIPE to signal there will no more
buffers to dequeue until STREAMOFF.
The driver signals the last buffer by setting the V4L2_BUF_FLAG_LAST.
To reenable dequeuing on the capture queue, the driver must explicitly
call vb2_clear_last_buffer_queued. The last buffer queued flag is
cleared automatically during STREAMOFF.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'include/media/videobuf2-core.h')
| -rw-r--r-- | include/media/videobuf2-core.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h index a5790fd5d125..22a44c2f5963 100644 --- a/include/media/videobuf2-core.h +++ b/include/media/videobuf2-core.h @@ -381,6 +381,9 @@ struct v4l2_fh; * @waiting_for_buffers: used in poll() to check if vb2 is still waiting for * buffers. Only set for capture queues if qbuf has not yet been * called since poll() needs to return POLLERR in that situation. + * @last_buffer_dequeued: used in poll() and DQBUF to immediately return if the + * last decoded buffer was already dequeued. Set for capture queues + * when a buffer with the V4L2_BUF_FLAG_LAST is dequeued. * @fileio: file io emulator internal data, used only if emulator is active * @threadio: thread io internal data, used only if thread is active */ @@ -423,6 +426,7 @@ struct vb2_queue { unsigned int start_streaming_called:1; unsigned int error:1; unsigned int waiting_for_buffers:1; + unsigned int last_buffer_dequeued:1; struct vb2_fileio_data *fileio; struct vb2_threadio_data *threadio; @@ -603,6 +607,15 @@ static inline bool vb2_start_streaming_called(struct vb2_queue *q) return q->start_streaming_called; } +/** + * vb2_clear_last_buffer_dequeued() - clear last buffer dequeued flag of queue + * @q: videobuf queue + */ +static inline void vb2_clear_last_buffer_dequeued(struct vb2_queue *q) +{ + q->last_buffer_dequeued = false; +} + /* * The following functions are not part of the vb2 core API, but are simple * helper functions that you can use in your struct v4l2_file_operations, |