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mpegts: only calculate stat index when its needed during probe

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40% faster probe

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-11-09 16:09:26 +01:00
parent 9825b99eca
commit e624df5dc3
1 changed files with 2 additions and 5 deletions
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7
libavformat/mpegts.c
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@ -452,22 +452,19 @@ static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
static int analyze(const uint8_t *buf, int size, int packet_size, int *index){ static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
int stat[TS_MAX_PACKET_SIZE]; int stat[TS_MAX_PACKET_SIZE];
int i; int i;
int x=0;
int best_score=0; int best_score=0;
memset(stat, 0, packet_size*sizeof(*stat)); memset(stat, 0, packet_size*sizeof(*stat));
for(x=i=0; i<size-3; i++){ for(i=0; i<size-3; i++){
if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && buf[i+3] != 0x47){ if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && buf[i+3] != 0x47){
int x = i % packet_size;
stat[x]++; stat[x]++;
if(stat[x] > best_score){ if(stat[x] > best_score){
best_score= stat[x]; best_score= stat[x];
if(index) *index= x; if(index) *index= x;
} }
} }
x++;
if(x == packet_size) x= 0;
} }
return best_score; return best_score;