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wav: Don't avio_seek() if we know we'll run into EOF 

Since we want to break the loop the 'if (data_ofs < 0)' block is moved after the loop.
This fixes ticket #250.
This commit is contained in:
Tomas Härdin 2011-05-27 22:01:32 +02:00 committed by Michael Niedermayer
parent c328122a8d
commit f86d260df3
1 changed files with 16 additions and 13 deletions
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29
libavformat/wav.c
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@ -341,14 +341,8 @@ static int wav_read_header(AVFormatContext *s,
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;
}
if (url_feof(pb))
break;
}
switch (tag) {
case MKTAG('f', 'm', 't', ' '):
@ -370,16 +364,16 @@ static int wav_read_header(AVFormatContext *s,
next_tag_ofs = wav->data_end = avio_tell(pb) + data_size;
} else {
data_size = size;
wav->data_end = size ? next_tag_ofs : INT64_MAX;
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;
data_ofs = avio_tell(pb);
break;
case MKTAG('f','a','c','t'):
if(!sample_count)
@ -390,11 +384,20 @@ static int wav_read_header(AVFormatContext *s,
return ret;
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 (data_ofs >= 0)
avio_seek(pb, data_ofs, SEEK_SET);
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 = (data_size<<3) / (st->codec->channels * (uint64_t)av_get_bits_per_sample(st->codec->codec_id));