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avcodec/v4l2_m2m_dec: fix dropped packets while decoding

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* FFmpeg retrieves a packet from the bitstream
* It attempts to get an input buffer (from its own list or by dequeuing one from the driver)
* If no input buffer is found, the bitstream packet is dropped instead of scheduled for trying again later

It's an issue that showed especially at high speeds (like using `-f null -` as output parameters).

Signed-off-by: Aman Gupta <aman@tmm1.net>
This commit is contained in:
Maxime Jourdan 2019-08-30 11:34:52 -07:00 committed by Aman Gupta
parent fac834b2ae
commit 584ac1ad0b
2 changed files with 17 additions and 5 deletions
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1
libavcodec/v4l2_m2m.h
View File

@ -56,6 +56,7 @@ typedef struct V4L2m2mContext {
/* null frame/packet received */
int draining;
AVPacket buf_pkt;
/* Reference to self; only valid while codec is active. */
AVBufferRef *self_ref;

21
libavcodec/v4l2_m2m_dec.c
View File

@ -133,9 +133,14 @@ static int v4l2_receive_frame(AVCodecContext *avctx, AVFrame *frame)
AVPacket avpkt = {0};
int ret;
ret = ff_decode_get_packet(avctx, &avpkt);
if (ret < 0 && ret != AVERROR_EOF)
return ret;
if (s->buf_pkt.size) {
avpkt = s->buf_pkt;
memset(&s->buf_pkt, 0, sizeof(AVPacket));
} else {
ret = ff_decode_get_packet(avctx, &avpkt);
if (ret < 0 && ret != AVERROR_EOF)
return ret;
}
if (s->draining)
goto dequeue;
@ -144,6 +149,8 @@ static int v4l2_receive_frame(AVCodecContext *avctx, AVFrame *frame)
if (ret < 0) {
if (ret != AVERROR(EAGAIN))
return ret;
s->buf_pkt = avpkt;
/* no input buffers available, continue dequeing */
}
@ -161,7 +168,8 @@ static int v4l2_receive_frame(AVCodecContext *avctx, AVFrame *frame)
}
dequeue:
av_packet_unref(&avpkt);
if (!s->buf_pkt.size)
av_packet_unref(&avpkt);
return ff_v4l2_context_dequeue_frame(capture, frame, -1);
}
@ -207,7 +215,10 @@ static av_cold int v4l2_decode_init(AVCodecContext *avctx)
static av_cold int v4l2_decode_close(AVCodecContext *avctx)
{
return ff_v4l2_m2m_codec_end(avctx->priv_data);
V4L2m2mPriv *priv = avctx->priv_data;
V4L2m2mContext* s = priv->context;
av_packet_unref(&s->buf_pkt);
return ff_v4l2_m2m_codec_end(priv);
}
#define OFFSET(x) offsetof(V4L2m2mPriv, x)