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lavf/flvdec: Allow files where the PreviousTagSize is not set according to the spec.

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Some muxer use the FLV field PreviousTagSize to be the sum of tag
length. Without this change, the flv demuxer think the file is broken
and the re-sync will fail.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Thierry Foucu 2016-01-29 10:47:49 -08:00 committed by Michael Niedermayer
parent 583a643146
commit 9a09952695
1 changed files with 5 additions and 1 deletions
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6
libavformat/flvdec.c
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@ -60,6 +60,7 @@ typedef struct FLVContext {
uint8_t resync_buffer[2*RESYNC_BUFFER_SIZE];
int broken_sizes;
int sum_flv_tag_size;
} FLVContext;
static int probe(AVProbeData *p, int live)
@ -629,6 +630,7 @@ static int flv_read_metabody(AVFormatContext *s, int64_t next_pos)
static int flv_read_header(AVFormatContext *s)
{
int offset, flags;
FLVContext *flv = s->priv_data;
avio_skip(s->pb, 4);
flags = avio_r8(s->pb);
@ -649,6 +651,7 @@ static int flv_read_header(AVFormatContext *s)
avio_skip(s->pb, 4);
s->start_time = 0;
flv->sum_flv_tag_size = 0;
return 0;
}
@ -857,6 +860,7 @@ retry:
type = (avio_r8(s->pb) & 0x1F);
orig_size =
size = avio_rb24(s->pb);
flv->sum_flv_tag_size += size + 11;
dts = avio_rb24(s->pb);
dts |= (unsigned)avio_r8(s->pb) << 24;
av_log(s, AV_LOG_TRACE, "type:%d, size:%d, last:%d, dts:%"PRId64" pos:%"PRId64"\n", type, size, last, dts, avio_tell(s->pb));
@ -1141,7 +1145,7 @@ retry_duration:
leave:
last = avio_rb32(s->pb);
if (last != orig_size + 11 &&
(last != orig_size || !last) &&
(last != orig_size || !last) && last != flv->sum_flv_tag_size &&
!flv->broken_sizes) {
av_log(s, AV_LOG_ERROR, "Packet mismatch %d %d\n", last, orig_size + 11);
avio_seek(s->pb, pos + 1, SEEK_SET);