/**
\fn getTimeCode
\brief Retrieve the timeinc value from the bitstream given. timebits is the #of bits to code it (in vol header)
*/
uint8_t getTimeCode(ADMBitstream *stream,uint32_t timebits,uint32_t *timeval)
{
uint32_t off=0;
uint32_t globalOff=0;
uint8_t code;
uint32_t modulo,time_inc,vopcoded,vopType;
uint8_t *begin,*end;
begin=stream->data;
end=stream->data+stream->len;
while(begin<end-3)
{
if( ADM_findMpegStartCode(begin, end,&code,&off))
{
if(code==0xb6)
{
/* Get more info */
if( extractVopInfo(begin+off, end-begin-off, timebits,&vopType,&modulo, timeval,&vopcoded))
{
aprintf(" frame found: vopType:%x modulo:%d time_inc:%d vopcoded:%d\n",vopType,modulo,time_inc,vopcoded);
return 1;
}
return 0;
}
begin+=off;
}
else return 0;
}
return 0;
}
//************************************************
uint8_t lookupSeqEnd(ADMBitstream *bitstream,uint32_t *position)
{
uint8_t *ptr=bitstream->data,*end,code;
uint32_t len=bitstream->len,offset;
end=ptr+len;
while(ADM_findMpegStartCode(ptr, end,&code,&offset))
{
if(code==SEQ_END_CODE)
{
*position=ptr-bitstream->data+offset-4;
return 1;
}
ptr+=offset;
}
return 0;
}
//_____________________________________________________
// Update the user data field that is used to
// detect in windows world if it is packed or not
//_____________________________________________________
void updateUserData(uint8_t *start, uint32_t len)
{
// lookup startcode
uint32_t sync,off,rlen;
uint8_t code;
uint8_t *end=start+len;
while(ADM_findMpegStartCode(start, end,&code,&off))
{
// update
start+=off;
rlen=end-start;
if(code!=0xb2 || rlen<4)
continue;
printf("User data found\n");
// looks ok ?
if(!strncmp((char *)start,"DivX",4))
{
//
start+=4;
rlen-=4; // skip "DivX"
// looks for a p while not null
// if there isnt we will reach a new startcode
// and it will stop
while((*start!='p') && rlen)
{
if(!*start)
{
rlen=0;
break;
}
rlen--;
start++;
}
if(!rlen)
{
printf("Unpacketizer:packed marker not found!\n");
}
else
*start='n'; // remove 'p'
return;
}
}
}
void updateUserData(uint8_t *start, uint32_t len)
{
// lookup startcode
uint32_t sync,off,rlen;
uint8_t code;
uint8_t *end=start+len;
while(ADM_findMpegStartCode(start, end,&code,&off))
{
// update
start+=off;
rlen=end-start;
if(code!=0xb2 || rlen<4)
continue;
printf("User data found\n");
// looks ok ?
if(!strncmp((char *)start,"DivX",4) && start[7]=='b'&& rlen>=14)
{
memcpy(start,signature,4+3+4+1+1+1); // 14
}
}
}
/**
\fn detectPs
\brief returns true if the file seems to be mpeg PS
*/
bool detectPs(const char *file)
{
uint32_t bufferSize;
uint32_t nbPacket,nbMatch=0;
FILE *f=ADM_fopen(file,"rb");
if(!f) return false;
uint8_t *buffer = new uint8_t[PROBE_SIZE];
bufferSize=fread(buffer,1,PROBE_SIZE,f);
fclose(f);
nbPacket=bufferSize/2300;
uint8_t *head,*tail;
head=buffer;
tail=buffer+bufferSize;
uint8_t code;
uint32_t offset;
bool r = false;
// Is it a Seq Start ?
if(!buffer[0] && !buffer[1] && buffer[2]==1 && buffer[3]==0xba)
{
printf("Starts with SEQUENCE_START, probably MpegPS\n");
delete[] buffer;
return true;
}
while(ADM_findMpegStartCode(head,tail,&code,&offset))
{
head+=offset;
if(code==0xE0) nbMatch++;
}
printf(" match :%d / %d (probeSize:%d)\n",nbMatch,nbPacket,bufferSize);
if (nbMatch * 10 > nbPacket * 2)
{
r = true;
}
delete[] buffer;
return r;
}