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wav: Always seek to an even offset 

RIFF chunks are aligned to 16bit according to the specification.

Bug-Id:500
CC:libav-stable@libav.org
This commit is contained in:
Luca Barbato 2013-05-04 12:18:57 +02:00
parent 46c1917350
commit ac87eaf856
1 changed files with 8 additions and 2 deletions
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10
libavformat/wavdec.c
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@ -49,6 +49,12 @@ static int64_t next_tag(AVIOContext *pb, uint32_t *tag)
return avio_rl32(pb); return avio_rl32(pb);
} }
/* RIFF chunks are always on a even offset. */
static int64_t wav_seek_tag(AVIOContext *s, int64_t offset, int whence)
{
return avio_seek(s, offset + (offset & 1), whence);
}
/* return the size of the found tag */ /* return the size of the found tag */
static int64_t find_tag(AVIOContext *pb, uint32_t tag1) static int64_t find_tag(AVIOContext *pb, uint32_t tag1)
{ {
@ -61,7 +67,7 @@ static int64_t find_tag(AVIOContext *pb, uint32_t tag1)
size = next_tag(pb, &tag); size = next_tag(pb, &tag);
if (tag == tag1) if (tag == tag1)
break; break;
avio_skip(pb, size); wav_seek_tag(pb, size, SEEK_CUR);
} }
return size; return size;
} }
@ -307,7 +313,7 @@ static int wav_read_header(AVFormatContext *s)
/* seek to next tag unless we know that we'll run into EOF */ /* seek to next tag unless we know that we'll run into EOF */
if ((avio_size(pb) > 0 && next_tag_ofs >= avio_size(pb)) || if ((avio_size(pb) > 0 && next_tag_ofs >= avio_size(pb)) ||
avio_seek(pb, next_tag_ofs, SEEK_SET) < 0) { wav_seek_tag(pb, next_tag_ofs, SEEK_SET) < 0) {
break; break;
} }
} }