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wav: keep parsing until EOF if the input is seekable and we know the size of the data tag 

Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Tomas Härdin 2011-05-18 13:48:02 +02:00 committed by Anton Khirnov
parent 90f2ee8cb4
commit 67b1761fcb
1 changed files with 32 additions and 15 deletions
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47
libavformat/wav.c
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@ -296,7 +296,7 @@ static int wav_read_header(AVFormatContext *s,
AVStream *st;
WAVContext *wav = s->priv_data;
int ret, got_fmt = 0;
int64_t next_tag_ofs;
int64_t next_tag_ofs, data_ofs = -1;
/* check RIFF header */
tag = avio_rl32(pb);
@ -327,13 +327,13 @@ static int wav_read_header(AVFormatContext *s,
avio_skip(pb, size - 16); /* skip rest of ds64 chunk */
}
for (;;) {
if (pb->eof_reached)
return -1;
size = next_tag(pb, &tag);
next_tag_ofs = avio_tell(pb) + size;
if (pb->eof_reached)
break;
switch (tag) {
case MKTAG('f', 'm', 't', ' '):
/* only parse the first 'fmt ' tag found */
@ -350,26 +350,43 @@ static int wav_read_header(AVFormatContext *s,
return AVERROR_INVALIDDATA;
}
goto break_loop;
if (rf64) {
next_tag_ofs = wav->data_end = avio_tell(pb) + data_size;
} else {
data_size = size;
next_tag_ofs = wav->data_end = size ? next_tag_ofs : INT64_MAX;
}
data_ofs = avio_tell(pb);
/* don't look for footer metadata if we can't seek or if we don't
* know where the data tag ends
*/
if (!pb->seekable || (!rf64 && !size))
goto break_loop;
break;
case MKTAG('f','a','c','t'):
if (!sample_count)
sample_count = avio_rl32(pb);
break;
}
avio_seek(pb, next_tag_ofs, SEEK_SET);
/* seek to next tag unless we know that we'll run into EOF */
if ((avio_size(pb) > 0 && next_tag_ofs >= avio_size(pb)) ||
avio_seek(pb, next_tag_ofs, SEEK_SET) < 0) {
break;
}
}
break_loop:
if (rf64)
size = data_size;
if (size < 0)
return -1;
if (!size) {
wav->data_end = INT64_MAX;
} else
wav->data_end= avio_tell(pb) + size;
if (data_ofs < 0) {
av_log(s, AV_LOG_ERROR, "no 'data' tag found\n");
return AVERROR_INVALIDDATA;
}
avio_seek(pb, data_ofs, SEEK_SET);
if (!sample_count && st->codec->channels && av_get_bits_per_sample(st->codec->codec_id))
sample_count = (size<<3) / (st->codec->channels * (uint64_t)av_get_bits_per_sample(st->codec->codec_id));
sample_count = (data_size<<3) / (st->codec->channels * (uint64_t)av_get_bits_per_sample(st->codec->codec_id));
if (sample_count)
st->duration = sample_count;
return 0;