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Ogg: discard non-essential metadata from Vorbis header when creating extradata 

The first part of the metadata, the "vendor" string, is required by
libvorbis, it will refuse to play when it is not available.
Also we do not currently parse that part into metadata so it would also
be lost if we removed it as well.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Reimar Döffinger 2011-01-31 19:16:38 +00:00 committed by Mans Rullgard
parent 740ad0d14d
commit 8cb3c557a9
1 changed files with 10 additions and 2 deletions
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12
libavformat/oggparsevorbis.c
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@ -256,8 +256,16 @@ vorbis_header (AVFormatContext * s, int idx)
st->time_base.den = srate;
}
} else if (os->buf[os->pstart] == 3) {
if (os->psize > 8)
ff_vorbis_comment (s, &st->metadata, os->buf + os->pstart + 7, os->psize - 8);
if (os->psize > 8 &&
ff_vorbis_comment(s, &st->metadata, os->buf + os->pstart + 7, os->psize - 8) >= 0) {
// drop all metadata we parsed and which is not required by libvorbis
unsigned new_len = 7 + 4 + AV_RL32(priv->packet[1] + 7) + 4 + 1;
if (new_len >= 16 && new_len < os->psize) {
AV_WL32(priv->packet[1] + new_len - 5, 0);
priv->packet[1][new_len - 1] = 1;
priv->len[1] = new_len;
}
}
} else {
st->codec->extradata_size =
fixup_vorbis_headers(s, priv, &st->codec->extradata);