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| author | Anton Khirnov <anton@khirnov.net> | 2012-11-21 08:48:47 +0100 |
|---|---|---|
| committer | Anton Khirnov <anton@khirnov.net> | 2012-11-22 13:40:04 +0100 |
| commit | 9ae80e6a9cefcab61e867256ba19ef78a4bfe0cb (patch) | |
| tree | c399f75121f89c438569ab497b74bc3f1307af35 | |
| parent | 0d3123666a42ed6c74d0a052342175261304b8ca (diff) | |
| download | ffmpeg-9ae80e6a9cefcab61e867256ba19ef78a4bfe0cb.tar.gz | |
id3v2: fix reading unsynchronized frames.
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
| -rw-r--r-- | libavformat/id3v2.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/libavformat/id3v2.c b/libavformat/id3v2.c index 012d7933a8..4516ac74ef 100644 --- a/libavformat/id3v2.c +++ b/libavformat/id3v2.c @@ -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 |