gen
LTC (linear timecode) generator, in sync with the audio sample clock. Does not support drop-frame format. This implementation only works when the system clock is 48kHz or 96kHz, not at 44.1kHz!
Inlets
None
Outlets
int32 hours
int32 minutes
int32 seconds
int32 frames
frac32buffer ltc output
Attributes
combo fps
Declaration
uint8_t h; // hour counter
uint8_t m; // minute counter
uint8_t s; // seconds counter
uint8_t f; // frame counter
uint8_t b; // bit counter
uint8_t ss; // sample counter
int32_t bo; // bit output
void inc() {
f++;
if (f == attr_fps) {
f = 0;
s++;
if (s == 60) {
s = 0;
m++;
if (m == 60) {
m = 0;
h++;
}
}
}
}
void getbit() {
b++;
if (b == 160) {
b = 0;
inc();
}
if ((b & 1) == 0) {
bo = -bo;
} else {
switch (b >> 1) {
case 0:
bo = ((f % 10) & 0x1) ? -bo : bo;
break;
case 1:
bo = ((f % 10) & 0x2) ? -bo : bo;
break;
case 2:
bo = ((f % 10) & 0x4) ? -bo : bo;
break;
case 3:
bo = ((f % 10) & 0x8) ? -bo : bo;
break;
case 4: // user bits field 1
case 5:
case 6:
case 7:
break;
case 8:
bo = ((f / 10) & 0x1) ? -bo : bo;
break;
case 9:
bo = ((f / 10) & 0x2) ? -bo : bo;
break;
case 10: // drop frame
case 11: // color frame
case 12: // user bits field 2
case 13:
case 14:
case 15:
break;
case 16:
bo = ((s % 10) & 0x1) ? -bo : bo;
break;
case 17:
bo = ((s % 10) & 0x2) ? -bo : bo;
break;
case 18:
bo = ((s % 10) & 0x4) ? -bo : bo;
break;
case 19:
bo = ((s % 10) & 0x8) ? -bo : bo;
break;
case 20: // user bits field 3
case 21:
case 22:
case 23:
break;
case 24:
bo = ((s / 10) & 0x1) ? -bo : bo;
break;
case 25:
bo = ((s / 10) & 0x2) ? -bo : bo;
break;
case 26:
bo = ((s / 10) & 0x4) ? -bo : bo;
break;
case 27: // even parity (unimplemented)
case 28: // user bits field 4
case 29:
case 30:
case 31:
break;
case 32:
bo = ((m % 10) & 0x1) ? -bo : bo;
break;
case 33:
bo = ((m % 10) & 0x2) ? -bo : bo;
break;
case 34:
bo = ((m % 10) & 0x4) ? -bo : bo;
break;
case 35:
bo = ((m % 10) & 0x8) ? -bo : bo;
break;
case 36: // user bits field 5
case 37:
case 38:
case 39:
break;
case 40:
bo = ((m / 10) & 0x1) ? -bo : bo;
break;
case 41:
bo = ((m / 10) & 0x2) ? -bo : bo;
break;
case 42:
bo = ((m / 10) & 0x4) ? -bo : bo;
break;
case 43: // binary group flag
case 44: // user bits field 6
case 45:
case 46:
case 47:
break;
case 48:
bo = ((h % 10) & 0x1) ? -bo : bo;
break;
case 49:
bo = ((h % 10) & 0x2) ? -bo : bo;
break;
case 50:
bo = ((h % 10) & 0x4) ? -bo : bo;
break;
case 51:
bo = ((h % 10) & 0x8) ? -bo : bo;
break;
case 52: // user bits field 7
case 53:
case 54:
case 55:
break;
case 56:
bo = ((h / 10) & 0x1) ? -bo : bo;
break;
case 57:
bo = ((h / 10) & 0x2) ? -bo : bo;
break;
case 58:
bo = ((h / 10) & 0x4) ? -bo : bo;
break;
case 59: // binary group flag
case 60: // user bits field 8
case 61:
case 62:
case 63:
break;
case 64:
case 65:
break;
case 66:
case 67:
case 68:
case 69:
case 70:
case 71:
case 72:
case 73:
case 74:
case 75:
case 76:
case 77:
bo = -bo;
break;
case 78:
break;
case 79:
bo = -bo;
break;
default:
break;
}
}
}
Init
h = 0;
m = 0;
s = 0;
f = 0;
b = 0;
ss = 0;
bo = 1 << 26;
Control Rate
outlet_h = h;
outlet_m = m;
outlet_s = s;
outlet_f = f;
Audio Rate
outlet_out = bo;
ss++;
if (ss == ((SAMPLERATE / 160) / attr_fps)) {
ss = 0;
getbit();
}