Check the MPEG version ID for the reserved bit pattern 01, and abort header parsing in that case. This reduces the chance of misinterpreting arbitrary data as a valid frame start, and prevents the resulting audio artifacts. --- libavcodec/mpegaudiodecheader.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/libavcodec/mpegaudiodecheader.c b/libavcodec/mpegaudiodecheader.c index 6cc79f18b5..23029f186a 100644 --- a/libavcodec/mpegaudiodecheader.c +++ b/libavcodec/mpegaudiodecheader.c @@ -46,10 +46,11 @@ int avpriv_mpegaudio_decode_header(MPADecodeHeader *s, uint32_t header) if (header & (1<<20)) { s->lsf = (header & (1<<19)) ? 0 : 1; mpeg25 = 0; - } else { + } else if (!(header & (1<<19))) { s->lsf = 1; mpeg25 = 1; - } + } else + return -1; // reserved id s->layer = 4 - ((header >> 17) & 3); /* extract frequency */ -- 2.14.3 (Apple Git-98) _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel