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-rw-r--r--src/lib/smpte.cpp221
1 files changed, 221 insertions, 0 deletions
diff --git a/src/lib/smpte.cpp b/src/lib/smpte.cpp
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1#include "smpte.h"
2#include "memutils.h"
3#define SMPTE_DEBUG 0
4SMPTEgenerator::SMPTEgenerator(__uint32 p_samplerate)
5{
6#if (SMPTE_DEBUG==1)
7 cout << "Construct SMPTE generator with samrate=" << p_samplerate << endl;
8#endif
9// this->lastframe=-1;
10 this->prevbitnum=-1;
11 this->prevhalfbit=-1;
12 this->haveframe=0;
13 this->prevoutval=0;
14 this->framerate=30; // 30 is default for HD24.
15 this->bitsperframe=80;
16 this->nondrop=1;
17 this->setsamplerate(p_samplerate);
18 this->smpteword=(short*)memutils::mymalloc("smptegenerator::smptegenerator",80,sizeof(short));
19 // pre-fill sync word
20 for (int i=0;i<64;i++)
21 {
22 this->smpteword[i]=0;
23 }
24 this->smpteword[64]=0;
25 this->smpteword[65]=0;
26 this->smpteword[66]=1;
27 this->smpteword[67]=1;
28 this->smpteword[68]=1;
29 this->smpteword[69]=1;
30 this->smpteword[70]=1;
31 this->smpteword[71]=1;
32 this->smpteword[72]=1;
33 this->smpteword[73]=1;
34 this->smpteword[74]=1;
35 this->smpteword[75]=1;
36 this->smpteword[76]=1;
37 this->smpteword[77]=1;
38 this->smpteword[78]=0;
39 this->smpteword[79]=1;
40}
41
42SMPTEgenerator::~SMPTEgenerator()
43{
44 if (this==NULL)
45 {
46 return;
47 }
48 if (smpteword==NULL)
49 {
50 return;
51 }
52 memutils::myfree("SMPTE",smpteword);
53 smpteword=NULL;
54}
55void SMPTEgenerator::recalcrates()
56{
57
58 this->bitspersecond=bitsperframe*framerate;
59
60}
61
62void SMPTEgenerator::setsamplerate(__uint32 p_samplerate)
63{
64 this->samplerate=p_samplerate;
65 this->recalcrates();
66 return;
67}
68
69void SMPTEgenerator::setframerate(__uint32 p_framerate)
70{
71 this->framerate=p_framerate;
72 this->recalcrates();
73}
74
75void SMPTEgenerator::fillword(int hour,int minute,int second,int frame)
76{
77#if (SMPTE_DEBUG==1)
78 cout << "fill word for "
79 << hour << ":" << minute << ":" << second <<"."<<frame << endl;
80#endif
81 int frameunits=(frame%10);
82 int frametens=(int)((frame-frameunits)/10);
83
84 int secondsunits=(second%10);
85 int secondstens=(int)((second-secondsunits)/10);
86
87 int minuteunits=(minute%10);
88 int minutetens=(int)((minute-minuteunits)/10);
89
90 int hourunits=(hour%10);
91 int hourtens=(int)((hour-hourunits)/10);
92
93
94 this->smpteword[0]=((frameunits ) & 1);
95 this->smpteword[1]=((frameunits>>1) & 1);
96 this->smpteword[2]=((frameunits>>2) & 1);
97 this->smpteword[3]=((frameunits>>3) & 1);
98// this->smpteword[4]=0;
99// this->smpteword[5]=0;
100// this->smpteword[6]=0;
101// this->smpteword[7]=0;
102 this->smpteword[8]=((frametens) & 1);
103 this->smpteword[9]=((frametens>>1) & 1);
104// this->smpteword[10]=0;
105// this->smpteword[11]=0;
106// this->smpteword[12]=0;
107// this->smpteword[13]=0;
108// this->smpteword[14]=0;
109// this->smpteword[15]=0;
110 this->smpteword[16]=((secondsunits ) & 1);
111 this->smpteword[17]=((secondsunits>>1) & 1);
112 this->smpteword[18]=((secondsunits>>2) & 1);
113 this->smpteword[19]=((secondsunits>>3) & 1);
114// this->smpteword[20]=0;
115// this->smpteword[21]=0;
116// this->smpteword[22]=0;
117// this->smpteword[23]=0;
118 this->smpteword[24]=((secondstens )&1);
119 this->smpteword[25]=((secondstens>>1)&1);
120 this->smpteword[26]=((secondstens>>2)&1);
121 this->smpteword[27]=0; // is biphasemark, filled in later
122 // but reset here to prevent its influence
123
124// this->smpteword[28]=0;
125// this->smpteword[29]=0;
126// this->smpteword[30]=0;
127// this->smpteword[31]=0;
128 this->smpteword[32]=((minuteunits ) & 1);
129 this->smpteword[33]=((minuteunits>>1) & 1);
130 this->smpteword[34]=((minuteunits>>2) & 1);
131 this->smpteword[35]=((minuteunits>>3) & 1);
132// this->smpteword[36]=0;
133// this->smpteword[37]=0;
134// this->smpteword[38]=0;
135// this->smpteword[39]=0;
136 this->smpteword[40]=((minutetens ) & 1);
137 this->smpteword[41]=((minutetens>>1) & 1);
138 this->smpteword[42]=((minutetens>>2) & 1);
139// this->smpteword[43]=0; # binary group flag bit
140// this->smpteword[44]=0;
141// this->smpteword[45]=0;
142// this->smpteword[46]=0;
143// this->smpteword[47]=0;
144 this->smpteword[48]=((hourunits )&1);
145 this->smpteword[49]=((hourunits>>1)&1);
146 this->smpteword[50]=((hourunits>>2)&1);
147 this->smpteword[51]=((hourunits>>3)&1);
148// this->smpteword[52]=0;
149// this->smpteword[53]=0;
150// this->smpteword[54]=0;
151// this->smpteword[55]=0;
152 this->smpteword[56]=((hourtens )&1);
153 this->smpteword[57]=((hourtens>>1)&1);
154// this->smpteword[58]=0; // reserved, must be 0
155// this->smpteword[59]=0; // binary group flag bit
156// this->smpteword[60]=0;
157// this->smpteword[61]=0;
158// this->smpteword[62]=0;
159// this->smpteword[63]=0;
160
161 // sync word already set in constructor
162 unsigned parity = 0;
163 for (int i=0; i<80; ++i) {
164 parity += this->smpteword[i];
165 }
166 this->smpteword[27] = (parity & 1);
167#if (SMPTE_DEBUG==1)
168 for (int i=0;i<80;i++)
169 {
170 cout << this->smpteword[i];
171 }
172 cout << endl;
173#endif
174 return;
175
176}
177int SMPTEgenerator::modulate(int currbitval,int bitnum,int halfbit)
178{
179 if ((bitnum!=this->prevbitnum) || ((halfbit!=this->prevhalfbit) && (currbitval==1)))
180 {
181 this->prevoutval=1-(this->prevoutval);
182 }
183 this->prevbitnum=bitnum;
184 this->prevhalfbit=halfbit;
185 return this->prevoutval;
186}
187
188int SMPTEgenerator::getbit(__uint32 insamnum)
189{
190
191 this->samplesperbit=(int)((this->samplerate)/this->bitspersecond);
192 this->samplesperframe=(int)((this->samplerate)/framerate);
193
194 __uint32 sampleinsecond=insamnum % this->samplerate;
195 __uint32 currentsecond=(insamnum-sampleinsecond)/(this->samplerate);
196 __uint32 currenthour=int(currentsecond/3600);
197 currentsecond-=3600*currenthour;
198 __uint32 currentminute=int(currentsecond/60);
199 currentsecond-=60*currentminute;
200
201 __uint32 currentframe=(int)(sampleinsecond/this->samplesperframe);
202 __uint32 sampleinframe=sampleinsecond-(currentframe*this->samplesperframe);
203 __uint32 bitinframe=(int)(sampleinframe/this->samplesperbit);
204 __uint32 subbit=(int)(sampleinframe-(bitinframe*this->samplesperbit));
205 __uint32 halfbit=(this->samplesperbit/2);
206 if ((bitinframe==0)&&(subbit==0))
207 {
208 this->haveframe=0;
209 }
210 if (this->haveframe==0)
211 {
212 this->fillword(currenthour,currentminute,currentsecond,currentframe);
213 this->haveframe=1;
214 }
215
216 if (subbit<halfbit) {
217 return this->modulate(smpteword[bitinframe],bitinframe,0);
218 }
219 return this->modulate(smpteword[bitinframe],bitinframe,1);
220}
221
© 2015 Mike Crute