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| author | Kamil Debski <k.debski@samsung.com> | 2015-02-23 09:26:17 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2015-04-10 09:46:07 -0300 |
| commit | f61bf13b6a07a93b9348e77808d369803f40b681 (patch) | |
| tree | 44ab9d2d33ff1c70cc3d5798a70a913b342737e6 /include/media | |
| parent | 06e7a9b638467fddf8f62ca9f07adc7754319461 (diff) | |
| download | lwn-f61bf13b6a07a93b9348e77808d369803f40b681.tar.gz lwn-f61bf13b6a07a93b9348e77808d369803f40b681.zip | |
[media] vb2: add allow_zero_bytesused flag to the vb2_queue struct
The vb2: fix bytesused == 0 handling (8a75ffb) patch changed the behavior
of __fill_vb2_buffer function, so that if bytesused is 0 it is set to the
size of the buffer. However, bytesused set to 0 is used by older codec
drivers as as indication used to mark the end of stream.
To keep backward compatibility, this patch adds a flag passed to the
vb2_queue_init function - allow_zero_bytesused. If the flag is set upon
initialization of the queue, the videobuf2 keeps the value of bytesused
intact in the OUTPUT queue and passes it to the driver.
Reported-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'include/media')
| -rw-r--r-- | include/media/videobuf2-core.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h index e49dc6b0de81..a5790fd5d125 100644 --- a/include/media/videobuf2-core.h +++ b/include/media/videobuf2-core.h @@ -337,6 +337,7 @@ struct v4l2_fh; * @io_modes: supported io methods (see vb2_io_modes enum) * @fileio_read_once: report EOF after reading the first buffer * @fileio_write_immediately: queue buffer after each write() call + * @allow_zero_bytesused: allow bytesused == 0 to be passed to the driver * @lock: pointer to a mutex that protects the vb2_queue struct. The * driver can set this to a mutex to let the v4l2 core serialize * the queuing ioctls. If the driver wants to handle locking @@ -388,6 +389,7 @@ struct vb2_queue { unsigned int io_modes; unsigned fileio_read_once:1; unsigned fileio_write_immediately:1; + unsigned allow_zero_bytesused:1; struct mutex *lock; struct v4l2_fh *owner; |