Hi Guennadi,
On Friday 01 April 2011 16:06:42 Guennadi Liakhovetski wrote:
> This patch extends the videobuf2 framework with new helper functions and
> modifies existing ones to support multi-size video-buffers.
[snip]
> diff --git a/include/media/videobuf2-core.h
> b/include/media/videobuf2-core.h index f87472a..88076fc 100644
> --- a/include/media/videobuf2-core.h
> +++ b/include/media/videobuf2-core.h
> @@ -177,6 +177,10 @@ struct vb2_buffer {
> * plane should be set in the sizes[] array and optional
> * per-plane allocator specific context in alloc_ctxs[]
> * array
> + * @queue_add: like above, but called from VIDIOC_CREATE_BUFS,
> but if
> + * there are already buffers on the queue, it won't replace
> + * them, but add new ones, possibly with a different format
> + * and plane sizes
I don't think drivers will need to perform different operations in queue_setup
and queue_add. You could merge the two operations.
> * @wait_prepare: release any locks taken while calling vb2 functions;
> * it is called before an ioctl needs to wait for a new
> * buffer to arrive; required to avoid a deadlock in
> @@ -194,6 +198,8 @@ struct vb2_buffer {
> * each hardware operation in this callback;
> * if an error is returned, the buffer will not be queued
> * in driver; optional
> + * @buf_submit: called primarily to invalidate buffer caches
> for faster
> + * consequent queuing; optional
What's the difference between buf_submit and buf_prepare ?
> * @buf_finish: called before every dequeue of the buffer back
> to
> * userspace; drivers may perform any operations required
> * before userspace accesses the buffer; optional
--
Regards,
Laurent Pinchart
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