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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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27
libavformat/wav.c
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@ -341,14 +341,8 @@ static int wav_read_header(AVFormatContext *s,
size = next_tag(pb, &tag); size = next_tag(pb, &tag);
next_tag_ofs = avio_tell(pb) + size; next_tag_ofs = avio_tell(pb) + size;
if (url_feof(pb)) { if (url_feof(pb))
if (data_ofs < 0) {
av_log(s, AV_LOG_ERROR, "no 'data' tag found\n");
return AVERROR_INVALIDDATA;
}
break; break;
}
switch (tag) { switch (tag) {
case MKTAG('f', 'm', 't', ' '): 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; next_tag_ofs = wav->data_end = avio_tell(pb) + data_size;
} else { } else {
data_size = size; 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 /* don't look for footer metadata if we can't seek or if we don't
* know where the data tag ends * know where the data tag ends
*/ */
if (!pb->seekable || (!rf64 && !size)) if (!pb->seekable || (!rf64 && !size))
goto break_loop; goto break_loop;
data_ofs = avio_tell(pb);
break; break;
case MKTAG('f','a','c','t'): case MKTAG('f','a','c','t'):
if(!sample_count) if(!sample_count)
@ -390,10 +384,19 @@ static int wav_read_header(AVFormatContext *s,
return ret; return ret;
break; 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: break_loop:
if (data_ofs >= 0) 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); avio_seek(pb, data_ofs, SEEK_SET);
if (!sample_count && st->codec->channels && av_get_bits_per_sample(st->codec->codec_id)) if (!sample_count && st->codec->channels && av_get_bits_per_sample(st->codec->codec_id))