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Code Issues Releases Activity

apedec: do not buffer decoded samples over AVPackets

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Only consume an AVPacket when all the samples have been read.

When the rate of samples output is limited (by the default value
of max_samples), consuming the first packet immediately will cause
timing problems:

- The first packet with PTS 0 will output 4608 samples and be
consumed entirely
- The second packet with PTS 64 will output the remaining samples
(typically, a lot, that's why max_samples exist) until the decoded
samples of the first packet have been exhausted, at which point the
samples of the second packet will be decoded and output when
av_decode_frame is called with the next packet).

That means there's a PTS jump since the first packet is 'decoded'
immediately, which can be seen with avplay or mplayer: the timing
jumps immediately to 6.2s (which is the size of a packet).

Sample: http://streams.videolan.org/issues/6348/Goldwave-MAClib.ape
Signed-off-by: Justin Ruggles <justin.ruggles@gmail.com>
This commit is contained in:
Rafaël Carré 2013-08-27 17:35:49 +02:00 committed by Justin Ruggles
parent 84146963d2
commit 91d4cfb812
1 changed files with 1 additions and 3 deletions
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4
libavcodec/apedec.c
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@ -1402,7 +1402,6 @@ static int ape_decode_frame(AVCodecContext *avctx, void *data,
int32_t *sample24;
int i, ch, ret;
int blockstodecode;
int bytes_used = 0;
/* this should never be negative, but bad things will happen if it is, so
check it just to make sure. */
@ -1468,7 +1467,6 @@ static int ape_decode_frame(AVCodecContext *avctx, void *data,
return AVERROR_INVALIDDATA;
}
bytes_used = avpkt->size;
}
if (!s->data) {
@ -1540,7 +1538,7 @@ static int ape_decode_frame(AVCodecContext *avctx, void *data,
*got_frame_ptr = 1;
return bytes_used;
return (s->samples == 0) ? avpkt->size : 0;
}
static void ape_flush(AVCodecContext *avctx)