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id3v2: fix reading unsynchronized frames.

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Current code would incorrectly process e.g. 'ff 00 ff 00 ff' to
'ff ff ff', while it should be 'ff ff 00 ff'.

Fixes Bug 395.

CC: libav-stable@libav.org
This commit is contained in:
Anton Khirnov 2012-11-21 08:48:47 +01:00
parent 0d3123666a
commit 9ae80e6a9c
1 changed files with 10 additions and 8 deletions
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18
libavformat/id3v2.c
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@ -617,21 +617,23 @@ static void ff_id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t
/* check for text tag or supported special meta tag */
} else if (tag[0] == 'T' || (extra_meta && (extra_func = get_extra_meta_func(tag, isv34)))) {
if (unsync || tunsync) {
int i, j;
int64_t end = avio_tell(s->pb) + tlen;
uint8_t *b;
av_fast_malloc(&buffer, &buffer_size, tlen);
if (!buffer) {
av_log(s, AV_LOG_ERROR, "Failed to alloc %d bytes\n", tlen);
goto seek;
}
for (i = 0, j = 0; i < tlen; i++, j++) {
buffer[j] = avio_r8(s->pb);
if (j > 0 && !buffer[j] && buffer[j - 1] == 0xff) {
/* Unsynchronised byte, skip it */
j--;
b = buffer;
while (avio_tell(s->pb) < end) {
*b++ = avio_r8(s->pb);
if (*(b - 1) == 0xff && avio_tell(s->pb) < end - 1) {
uint8_t val = avio_r8(s->pb);
*b++ = val ? val : avio_r8(s->pb);
}
}
ffio_init_context(&pb, buffer, j, 0, NULL, NULL, NULL, NULL);
tlen = j;
ffio_init_context(&pb, buffer, b - buffer, 0, NULL, NULL, NULL, NULL);
tlen = b - buffer;
pbx = &pb; // read from sync buffer
} else {
pbx = s->pb; // read straight from input