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avcodec/v4l2_m2m_dec: dequeue frame if input isn't ready 

The V4L2M2M API operates asynchronously, so multiple packets can
be enqueued before getting a batch of frames back. Since it was
only possible to receive a frame by submitting another packet,
there wasn't a way to drain those excess output frames from when
avcodec_receive_frame() returned AVERROR(EAGAIN).

Reviewed-by: Andriy Gelman <andriy.gelman@gmail.com>
Signed-off-by: Cameron Gutman <aicommander@gmail.com>
This commit is contained in:
Cameron Gutman 2021-12-14 02:12:15 +00:00 committed by Andriy Gelman
parent 63d5b6f935
commit 30322ebe3c
1 changed files with 6 additions and 2 deletions
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8
libavcodec/v4l2_m2m_dec.c
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@ -142,8 +142,12 @@ static int v4l2_receive_frame(AVCodecContext *avctx, AVFrame *frame)
if (!s->buf_pkt.size) {
ret = ff_decode_get_packet(avctx, &s->buf_pkt);
if (ret < 0 && ret != AVERROR_EOF)
return ret;
if (ret < 0) {
if (ret == AVERROR(EAGAIN))
return ff_v4l2_context_dequeue_frame(capture, frame, 0);
else if (ret != AVERROR_EOF)
return ret;
}
}
if (s->draining)