Module: libav Branch: master Commit: 9ae80e6a9cefcab61e867256ba19ef78a4bfe0cb
Author: Anton Khirnov <[email protected]> Committer: Anton Khirnov <[email protected]> Date: Wed Nov 21 08:48:47 2012 +0100 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: [email protected] --- libavformat/id3v2.c | 18 ++++++++++-------- 1 files changed, 10 insertions(+), 8 deletions(-) diff --git a/libavformat/id3v2.c b/libavformat/id3v2.c index 012d793..4516ac7 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 _______________________________________________ libav-commits mailing list [email protected] https://lists.libav.org/mailman/listinfo/libav-commits
