[go: up one dir, main page]
Menu ▾ ▴

[r5]: / trunk / src / lib / smpte.cpp  Maximize  Restore  History

Download this file

221 lines (200 with data), 6.0 kB 

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
#include "smpte.h"

#include "memutils.h"

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);

}