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avformat/m4vdec: Check for non startcode 00 00 00 sequences in probe 

Fixes miss detection of PCM as m4v
Fixes Ticket 3928

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 7c1835c52a)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-09-07 16:39:39 +02:00
parent 7248e73559
commit ced4e9fdbb
1 changed files with 5 additions and 3 deletions
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8
libavformat/m4vdec.c
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@ -33,13 +33,15 @@ 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) VO++;
else if (temp_buffer < 0x130) VOL++;
else if (temp_buffer >= 0x100 && temp_buffer < 0x120) VO++;
else if (temp_buffer >= 0x120 && temp_buffer < 0x130) VOL++;
else if ( !(0x1AF < temp_buffer && temp_buffer < 0x1B7)
&& !(0x1B9 < temp_buffer && temp_buffer < 0x1C4)) res++;
}