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

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Tomas Härdin 2011-05-18 13:48:02 +02:00 committed by Michael Niedermayer
parent a06d238e8c
commit 6629dbd299
1 changed files with 27 additions and 13 deletions
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40
libavformat/wav.c
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@ -216,7 +216,7 @@ 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);
@ -247,13 +247,19 @@ static int wav_read_header(AVFormatContext *s,
avio_skip(pb, size - 16); /* skip rest of ds64 chunk */
}
for (;;) {
if (url_feof(pb))
return -1;
size = next_tag(pb, &tag);
next_tag_ofs = avio_tell(pb) + size;
if (url_feof(pb)) {
if (data_ofs < 0) {
av_log(s, AV_LOG_ERROR, "no 'data' tag found\n");
return AVERROR_INVALIDDATA;
}
break;
}
switch (tag) {
case MKTAG('f', 'm', 't', ' '):
/* only parse the first 'fmt ' tag found */
@ -270,7 +276,21 @@ static int wav_read_header(AVFormatContext *s,
return AVERROR_INVALIDDATA;
}
if (rf64) {
next_tag_ofs = wav->data_end = avio_tell(pb) + data_size;
} else {
data_size = size;
wav->data_end = size ? next_tag_ofs : INT64_MAX;
}
/* 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;
data_ofs = avio_tell(pb);
break;
case MKTAG('f','a','c','t'):
if(!sample_count)
sample_count = avio_rl32(pb);
@ -279,17 +299,11 @@ static int wav_read_header(AVFormatContext *s,
avio_seek(pb, next_tag_ofs, SEEK_SET);
}
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)
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;