[FFmpeg-devel] [PATCH v5 5/7] avcodec/v4l2_context: resume the decoding process after source change event received.

Ming Qian andriy.gelman at gmail.com
Wed Jan 12 06:44:47 EET 2022


On Tue, 04. Jan 17:41, Andriy Gelman wrote:
> On Tue, 04. Jan 17:08, Ming Qian wrote:
> > client need to resume the decoding process
> > after it dequeues the source change event.
> > no matter what's the return value of v4l2_resolution_changed().
> > if the client doesn't resume the decoding process,
> > the decoder may keep waiting
> > 
> > in documentation of v4l2 stateful decoder, we can see the following
> > description:
> > 	The client must continue the sequence as described below to
> > 	continue the decoding process.
> > 	1.  Dequeue the source change event.
> > 		Important
> > 		A source change triggers an implicit decoder drain,
> > 		similar to the explicit Drain sequence. The decoder is
> > 		stopped after it completes. The decoding process must be
> > 		resumed with either a pair of calls to
> > 		VIDIOC_STREAMOFF() and VIDIOC_STREAMON() on the CAPTURE
> > 		queue, or a call to VIDIOC_DECODER_CMD() with the
> > 		V4L2_DEC_CMD_START command.
> > 	2.  Continue with the Capture Setup sequence.
> > 
> 
> This is just a clean up to remove the reinit variable so the commit title and
> description are wrong.
> 

Updated the commit message and pushed.

Thanks,
-- 
Andriy


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