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#include "smpte.h"
#include "memutils.h"
#define SMPTE_DEBUG 0
SMPTEgenerator::SMPTEgenerator(__uint32 p_samplerate)
{
#if (SMPTE_DEBUG==1)
cout << "Construct SMPTE generator with samrate=" << p_samplerate << endl;
#endif
// this->lastframe=-1;
this->prevbitnum=-1;
this->prevhalfbit=-1;
this->haveframe=0;
this->prevoutval=0;
this->framerate=30; // 30 is default for HD24.
this->bitsperframe=80;
this->nondrop=1;
this->setsamplerate(p_samplerate);
this->smpteword=(short*)memutils::mymalloc("smptegenerator::smptegenerator",80,sizeof(short));
// pre-fill sync word
for (int i=0;i<64;i++)
{
this->smpteword[i]=0;
}
this->smpteword[64]=0;
this->smpteword[65]=0;
this->smpteword[66]=1;
this->smpteword[67]=1;
this->smpteword[68]=1;
this->smpteword[69]=1;
this->smpteword[70]=1;
this->smpteword[71]=1;
this->smpteword[72]=1;
this->smpteword[73]=1;
this->smpteword[74]=1;
this->smpteword[75]=1;
this->smpteword[76]=1;
this->smpteword[77]=1;
this->smpteword[78]=0;
this->smpteword[79]=1;
}
SMPTEgenerator::~SMPTEgenerator()
{
if (this==NULL)
{
return;
}
if (smpteword==NULL)
{
return;
}
memutils::myfree("SMPTE",smpteword);
smpteword=NULL;
}
void SMPTEgenerator::recalcrates()
{
this->bitspersecond=bitsperframe*framerate;
}
void SMPTEgenerator::setsamplerate(__uint32 p_samplerate)
{
this->samplerate=p_samplerate;
this->recalcrates();
return;
}
void SMPTEgenerator::setframerate(__uint32 p_framerate)
{
this->framerate=p_framerate;
this->recalcrates();
}
void SMPTEgenerator::fillword(int hour,int minute,int second,int frame)
{
#if (SMPTE_DEBUG==1)
cout << "fill word for "
<< hour << ":" << minute << ":" << second <<"."<<frame << endl;
#endif
int frameunits=(frame%10);
int frametens=(int)((frame-frameunits)/10);
int secondsunits=(second%10);
int secondstens=(int)((second-secondsunits)/10);
int minuteunits=(minute%10);
int minutetens=(int)((minute-minuteunits)/10);
int hourunits=(hour%10);
int hourtens=(int)((hour-hourunits)/10);
this->smpteword[0]=((frameunits ) & 1);
this->smpteword[1]=((frameunits>>1) & 1);
this->smpteword[2]=((frameunits>>2) & 1);
this->smpteword[3]=((frameunits>>3) & 1);
// this->smpteword[4]=0;
// this->smpteword[5]=0;
// this->smpteword[6]=0;
// this->smpteword[7]=0;
this->smpteword[8]=((frametens) & 1);
this->smpteword[9]=((frametens>>1) & 1);
// this->smpteword[10]=0;
// this->smpteword[11]=0;
// this->smpteword[12]=0;
// this->smpteword[13]=0;
// this->smpteword[14]=0;
// this->smpteword[15]=0;
this->smpteword[16]=((secondsunits ) & 1);
this->smpteword[17]=((secondsunits>>1) & 1);
this->smpteword[18]=((secondsunits>>2) & 1);
this->smpteword[19]=((secondsunits>>3) & 1);
// this->smpteword[20]=0;
// this->smpteword[21]=0;
// this->smpteword[22]=0;
// this->smpteword[23]=0;
this->smpteword[24]=((secondstens )&1);
this->smpteword[25]=((secondstens>>1)&1);
this->smpteword[26]=((secondstens>>2)&1);
this->smpteword[27]=0; // is biphasemark, filled in later
// but reset here to prevent its influence
// this->smpteword[28]=0;
// this->smpteword[29]=0;
// this->smpteword[30]=0;
// this->smpteword[31]=0;
this->smpteword[32]=((minuteunits ) & 1);
this->smpteword[33]=((minuteunits>>1) & 1);
this->smpteword[34]=((minuteunits>>2) & 1);
this->smpteword[35]=((minuteunits>>3) & 1);
// this->smpteword[36]=0;
// this->smpteword[37]=0;
// this->smpteword[38]=0;
// this->smpteword[39]=0;
this->smpteword[40]=((minutetens ) & 1);
this->smpteword[41]=((minutetens>>1) & 1);
this->smpteword[42]=((minutetens>>2) & 1);
// this->smpteword[43]=0; # binary group flag bit
// this->smpteword[44]=0;
// this->smpteword[45]=0;
// this->smpteword[46]=0;
// this->smpteword[47]=0;
this->smpteword[48]=((hourunits )&1);
this->smpteword[49]=((hourunits>>1)&1);
this->smpteword[50]=((hourunits>>2)&1);
this->smpteword[51]=((hourunits>>3)&1);
// this->smpteword[52]=0;
// this->smpteword[53]=0;
// this->smpteword[54]=0;
// this->smpteword[55]=0;
this->smpteword[56]=((hourtens )&1);
this->smpteword[57]=((hourtens>>1)&1);
// this->smpteword[58]=0; // reserved, must be 0
// this->smpteword[59]=0; // binary group flag bit
// this->smpteword[60]=0;
// this->smpteword[61]=0;
// this->smpteword[62]=0;
// this->smpteword[63]=0;
// sync word already set in constructor
unsigned parity = 0;
for (int i=0; i<80; ++i) {
parity += this->smpteword[i];
}
this->smpteword[27] = (parity & 1);
#if (SMPTE_DEBUG==1)
for (int i=0;i<80;i++)
{
cout << this->smpteword[i];
}
cout << endl;
#endif
return;
}
int SMPTEgenerator::modulate(int currbitval,int bitnum,int halfbit)
{
if ((bitnum!=this->prevbitnum) || ((halfbit!=this->prevhalfbit) && (currbitval==1)))
{
this->prevoutval=1-(this->prevoutval);
}
this->prevbitnum=bitnum;
this->prevhalfbit=halfbit;
return this->prevoutval;
}
int SMPTEgenerator::getbit(__uint32 insamnum)
{
this->samplesperbit=(int)((this->samplerate)/this->bitspersecond);
this->samplesperframe=(int)((this->samplerate)/framerate);
__uint32 sampleinsecond=insamnum % this->samplerate;
__uint32 currentsecond=(insamnum-sampleinsecond)/(this->samplerate);
__uint32 currenthour=int(currentsecond/3600);
currentsecond-=3600*currenthour;
__uint32 currentminute=int(currentsecond/60);
currentsecond-=60*currentminute;
__uint32 currentframe=(int)(sampleinsecond/this->samplesperframe);
__uint32 sampleinframe=sampleinsecond-(currentframe*this->samplesperframe);
__uint32 bitinframe=(int)(sampleinframe/this->samplesperbit);
__uint32 subbit=(int)(sampleinframe-(bitinframe*this->samplesperbit));
__uint32 halfbit=(this->samplesperbit/2);
if ((bitinframe==0)&&(subbit==0))
{
this->haveframe=0;
}
if (this->haveframe==0)
{
this->fillword(currenthour,currentminute,currentsecond,currentframe);
this->haveframe=1;
}
if (subbit<halfbit) {
return this->modulate(smpteword[bitinframe],bitinframe,0);
}
return this->modulate(smpteword[bitinframe],bitinframe,1);
}
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