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avformat/mpegts: Improve probe heuristic by considering the overall frequency of 0x47 headers 

Fixes Ticket3939

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-09-13 22:08:21 +02:00
parent b96d864fd6
commit 296cd9c432
1 changed files with 3 additions and 4 deletions
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7
libavformat/mpegts.c
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@ -511,9 +511,9 @@ static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
static int analyze(const uint8_t *buf, int size, int packet_size, int *index)
{
int stat[TS_MAX_PACKET_SIZE];
int stat_all = 0;
int i;
int best_score = 0;
int best_score2 = 0;
memset(stat, 0, packet_size * sizeof(*stat));
@ -521,17 +521,16 @@ static int analyze(const uint8_t *buf, int size, int packet_size, int *index)
if (buf[i] == 0x47 && !(buf[i + 1] & 0x80) && buf[i + 3] != 0x47) {
int x = i % packet_size;
stat[x]++;
stat_all++;
if (stat[x] > best_score) {
best_score = stat[x];
if (index)
*index = x;
} else if (stat[x] > best_score2) {
best_score2 = stat[x];
}
}
}
return best_score - best_score2;
return best_score - FFMAX(stat_all - 10*best_score, 0)/10;
}
/* autodetect fec presence. Must have at least 1024 bytes */