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Code Issues Releases Activity

make mpeg-ps probe less happy with random data

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fixes missdetection of O-MP3-5.mp3

Originally committed as revision 11149 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2007-12-03 09:37:06 +00:00
parent 2db971135a
commit 7e1720dec6
1 changed files with 7 additions and 4 deletions
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11
libavformat/mpeg.c
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@ -67,7 +67,7 @@ static int check_pes(uint8_t *p, uint8_t *end){
static int mpegps_probe(AVProbeData *p) static int mpegps_probe(AVProbeData *p)
{ {
uint32_t code= -1; uint32_t code= -1;
int sys=0, pspack=0, priv1=0, vid=0, audio=0; int sys=0, pspack=0, priv1=0, vid=0, audio=0, invalid=0;
int i; int i;
int score=0; int score=0;
@ -85,16 +85,19 @@ static int mpegps_probe(AVProbeData *p)
else if(code == PACK_START_CODE) pspack++; else if(code == PACK_START_CODE) pspack++;
else if((code & 0xf0) == VIDEO_ID && pes) vid++; else if((code & 0xf0) == VIDEO_ID && pes) vid++;
else if((code & 0xe0) == AUDIO_ID && pes) audio++; else if((code & 0xe0) == AUDIO_ID && pes) audio++;
else if((code & 0xf0) == VIDEO_ID && !pes) invalid++;
else if((code & 0xe0) == AUDIO_ID && !pes) invalid++;
} }
} }
if(vid || audio) /* invalid VDR files nd short PES streams */ if(vid+audio > invalid) /* invalid VDR files nd short PES streams */
score= AVPROBE_SCORE_MAX/4; score= AVPROBE_SCORE_MAX/4;
//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d len:%d\n", sys, priv1, pspack,vid, audio, p->buf_size); //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d len:%d\n", sys, priv1, pspack,vid, audio, p->buf_size);
if(sys && sys*9 <= pspack*10) if(sys>invalid && sys*9 <= pspack*10)
return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg
if((priv1 || vid || audio) && (priv1+vid+audio)*9 <= pspack*10) if(priv1 + vid + audio > invalid && (priv1+vid+audio)*9 <= pspack*10)
return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg
if((!!vid ^ !!audio) && (audio+vid > 1) && !sys && !pspack && p->buf_size>2048) /* PES stream */ if((!!vid ^ !!audio) && (audio+vid > 1) && !sys && !pspack && p->buf_size>2048) /* PES stream */
return AVPROBE_SCORE_MAX/2+2; return AVPROBE_SCORE_MAX/2+2;