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| author | Alex Converse <alex.converse@gmail.com> | 2011-09-28 15:43:24 -0700 |
|---|---|---|
| committer | Alex Converse <alex.converse@gmail.com> | 2011-09-29 09:45:57 -0700 |
| commit | fe21f78d2bf1ac5b5400570a8a4031be3493aa7d (patch) | |
| tree | 63d1a63a184240d2a904a766181af88ef29499f6 /libavformat/mpeg.c | |
| parent | bf00a73ace9b1aba790b75dcb26d43adfceb769f (diff) | |
mpeg probe: check the 2/4-bit synchronization value found after a pack_start_code.
Diffstat (limited to 'libavformat/mpeg.c')
| -rw-r--r-- | libavformat/mpeg.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/libavformat/mpeg.c b/libavformat/mpeg.c index f797da7e27..ef683b1a05 100644 --- a/libavformat/mpeg.c +++ b/libavformat/mpeg.c @@ -49,6 +49,10 @@ static int check_pes(uint8_t *p, uint8_t *end){ return pes1||pes2; } +static int check_pack_header(const uint8_t *buf) { + return (buf[1] & 0xC0) == 0x40 || (buf[1] & 0xF0) == 0x20; +} + static int mpegps_probe(AVProbeData *p) { uint32_t code= -1; @@ -61,9 +65,10 @@ static int mpegps_probe(AVProbeData *p) if ((code & 0xffffff00) == 0x100) { int len= p->buf[i+1] << 8 | p->buf[i+2]; int pes= check_pes(p->buf+i, p->buf+p->buf_size); + int pack = check_pack_header(p->buf+i); if(code == SYSTEM_HEADER_START_CODE) sys++; - else if(code == PACK_START_CODE) pspack++; + else if(code == PACK_START_CODE && pack) pspack++; else if((code & 0xf0) == VIDEO_ID && pes) vid++; // skip pes payload to avoid start code emulation for private // and audio streams |