From: Michael Niedermayer Date: Sun, 7 Sep 2014 14:39:39 +0000 (+0200) Subject: m4vdec: Check for non-startcode 00 00 00 sequences in probe X-Git-Tag: v12_alpha1~25 X-Git-Url: https://git.libav.org/?p=libav.git;a=commitdiff_plain;h=e5b019725f53b79159931d3a7317107cbbfd0860;hp=3ccec334b8502701e72ef13bed25913c3578022e m4vdec: Check for non-startcode 00 00 00 sequences in probe This makes the m4v detection less trigger-happy. Bug-Id: 949 Signed-off-by: Diego Biurrun --- diff --git a/libavformat/m4vdec.c b/libavformat/m4vdec.c index 4a0af3c037..9d69dcc042 100644 --- a/libavformat/m4vdec.c +++ b/libavformat/m4vdec.c @@ -33,16 +33,18 @@ static int mpeg4video_probe(AVProbeData *probe_packet) for (i = 0; i < probe_packet->buf_size; i++) { temp_buffer = (temp_buffer << 8) + probe_packet->buf[i]; - if ((temp_buffer & 0xffffff00) != 0x100) + if (temp_buffer & 0xfffffe00) + continue; + if (temp_buffer < 2) continue; if (temp_buffer == VOP_START_CODE) VOP++; else if (temp_buffer == VISUAL_OBJECT_START_CODE) VISO++; - else if (temp_buffer < 0x120) + else if (temp_buffer >= 0x100 && temp_buffer < 0x120) VO++; - else if (temp_buffer < 0x130) + else if (temp_buffer >= 0x120 && temp_buffer < 0x130) VOL++; else if (!(0x1AF < temp_buffer && temp_buffer < 0x1B7) && !(0x1B9 < temp_buffer && temp_buffer < 0x1C4))