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psxstr: improve probe to not misdetect so much. 

The score of 50 can probably be raised if needed
Fixes Ticket490

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-09-23 19:01:12 +02:00
parent 4bd37ca6ae
commit 3f7dc480c1
1 changed files with 44 additions and 10 deletions
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46
libavformat/psxstr.c
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@ -68,6 +68,8 @@ static const char sync_header[12] = {0x00,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xf
static int str_probe(AVProbeData *p)
{
uint8_t *sector= p->buf;
uint8_t *end= sector + p->buf_size;
int aud=0, vid=0;
if (p->buf_size < RAW_CD_SECTOR_SIZE)
return 0;
@ -79,20 +81,52 @@ static int str_probe(AVProbeData *p)
sector += RIFF_HEADER_SIZE;
}
while (end - sector >= RAW_CD_SECTOR_SIZE) {
/* look for CD sync header (00, 0xFF x 10, 00) */
if (memcmp(sector,sync_header,sizeof(sync_header)))
return 0;
if(sector[0x11] >= 32)
return 0;
if( (sector[0x12] & CDXA_TYPE_MASK) != CDXA_TYPE_VIDEO
&& (sector[0x12] & CDXA_TYPE_MASK) != CDXA_TYPE_AUDIO
&& (sector[0x12] & CDXA_TYPE_MASK) != CDXA_TYPE_DATA)
if (sector[0x11] >= 32)
return 0;
switch (sector[0x12] & CDXA_TYPE_MASK) {
case CDXA_TYPE_DATA:
case CDXA_TYPE_VIDEO: {
int current_sector = AV_RL16(&sector[0x1C]);
int sector_count = AV_RL16(&sector[0x1E]);
int frame_size = AV_RL32(&sector[0x24]);
if(!( frame_size>=0
&& current_sector < sector_count
&& sector_count*VIDEO_DATA_CHUNK_SIZE >=frame_size)){
return 0;
}
/*st->codec->width = AV_RL16(&sector[0x28]);
st->codec->height = AV_RL16(&sector[0x2A]);*/
// if (current_sector == sector_count-1) {
vid++;
// }
}
break;
case CDXA_TYPE_AUDIO:
if(sector[0x13]&0x2A)
return 0;
aud++;
break;
default:
if(sector[0x12] & CDXA_TYPE_MASK)
return 0;
}
sector += RAW_CD_SECTOR_SIZE;
}
/* MPEG files (like those ripped from VCDs) can also look like this;
* only return half certainty */
return 50;
if(vid+aud > 3) return 50;
else if(vid+aud) return 1;
else return 0;
}
static int str_read_header(AVFormatContext *s,