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#include <SquawkSD.h>
SquawkSynthSD SquawkSD;
class StreamFile : public SquawkStream {
private:
Fat16 f;
public:
StreamFile(Fat16 file = Fat16()) { f = file; }
uint8_t read() { return f.read(); }
void seek(size_t offset) { f.seekSet(offset); }
};
static StreamFile file;
extern uint16_t period_tbl[84] PROGMEM;
void SquawkSynthSD::play(Fat16 melody) {
SquawkSynth::pause();
file = StreamFile(melody);
SquawkSynth::play(&file);
}
/*
void SquawkSynthSD::convert(Fat16 in, Fat16 out) {
unsigned int n;
uint8_t patterns = 0, order_count;
unsigned int ptn, row, chn;
uint8_t temp;
uint8_t fxc[4], fxp[4], note[4], sample[4];
uint16_t period;
out.write('S'); // ID
out.write('Q');
out.write('M');
out.write('1');
out.write((uint8_t)0); // No meta data
out.write((uint8_t)0);
// Write order list, count patterns
in.seek(0x3B6);
order_count = in.read();
out.write(order_count);
in.seek(0x3B8);
for(n = 0; n < order_count; n++) {
temp = in.read();
if(temp >= patterns) patterns = temp + 1;
out.write(temp);
}
// Write patterns
in.seek(0x43C);
for(ptn = 0; ptn < patterns; ptn++) {
for(row = 0; row < 64; row++) {
for(chn = 0; chn < 4; chn++) {
// Basic extraction
temp = in.read(); // sample.msb and period.msb
period = (temp & 0x0F) << 8;
sample[chn] = temp & 0xF0;
period |= in.read(); // period.lsb
temp = in.read(); // sample.lsb and effect
sample[chn] |= temp >> 4;
fxc[chn] = (temp & 0x0F) << 4;
fxp[chn] = in.read(); // parameters
if(fxc[chn] == 0xE0) {
fxc[chn] |= fxp[chn] >> 4; // extended parameters
fxp[chn] &= 0x0F;
}
#define DIF(A, B) ((A) > (B) ? ((int32_t)(A) - (int32_t)(B)) : ((int32_t)(B) - (int32_t)(A)))
// Find closest matching period
if(period == 0) {
note[chn] = 0x7F;
} else {
int16_t best = DIF(period, pgm_read_word(&period_tbl[0]));
note[chn] = 0;
for(n = 0; n < sizeof(period_tbl) / sizeof(uint16_t); n++) {
if(DIF(period, pgm_read_word(&period_tbl[n])) < best) {
note[chn] = n;
best = DIF(period, pgm_read_word(&period_tbl[n]));
}
}
}
// Crunch volume/decimal commands
if(fxc[chn] == 0x50 || fxc[chn] == 0x60 || fxc[chn] == 0xA0) {
fxp[chn] = (fxp[chn] >> 1) & 0x77;
} else if(fxc[chn] == 0x70) {
fxp[chn] = (fxp[chn] & 0xF0) | ((fxp[chn] & 0x0F) >> 1);
} else if(fxc[chn] == 0xC0 || fxc[chn] == 0xEA || fxc[chn] == 0xEB) {
fxp[chn] >>= 1;
} else if(fxc[chn] == 0xD0) {
fxp[chn] = ((fxp[chn] >> 4) * 10) | (fxp[chn] & 0x0F);
}
// Re-nibblify - it's a word!
if(chn != 3) {
if((fxc[chn] & 0xF0) == 0xE0) fxp[chn] |= fxc[chn] << 4;
fxc[chn] >>= 4;
}
}
// Ghetto crunch the last channel to save a byte
switch(fxc[3]) {
case 0x50: case 0x60: case 0xA0:
fxc[3] = 0x1;
if((fxp[3] >> 4) >= (fxp[3] & 0x0F)) {
fxp[3] = 0x80 + ((fxp[3] >> 4) - (fxp[3] & 0x0F));
} else {
fxp[3] = ((fxp[3] & 0x0F) - (fxp[3] >> 4));
}
break;
case 0x70:
fxc[3] = (fxp[3] & 0x4) ? 0x3 : 0x2;
fxp[3] = (fxp[3] >> 4) | ((fxp[3] & 0x03) << 4);
break;
case 0xC0:
fxc[3] = 0x4;
fxp[3] &= 0x1F;
break;
case 0xB0:
fxc[3] = 0x5;
fxp[3] &= 0x1F;
break;
case 0xD0:
fxc[3] = 0x6;
if(fxp[3] > 63) fxp[3] = 0;
break;
case 0xF0:
if(fxp[3] > 0x20) {
fxc[3] = 0x0;
fxp[3] = 0x00;
} else {
fxc[3] = 0x7;
}
break;
case 0xE7:
fxc[3] = 0x8;
break;
case 0xE9:
fxc[3] = 0x9;
break;
case 0xEA:
fxc[3] = 0xA;
fxp[3] |= 0x08;
break;
case 0xEB:
fxc[3] = 0xA;
break;
case 0xEC:
fxc[3] = 0xB;
break;
case 0xED:
fxc[3] = 0xB;
fxp[3] |= 0x10;
break;
case 0xEE:
fxc[3] = 0xC;
break;
default:
fxc[3] = 0;
fxp[3] = 0;
}
if(note[3] != 0x7F) fxp[3] |= 0x80;
if(sample[3]) fxp[3] |= 0x40;
// Write out
out.write((fxc[0]) | fxc[1] << 4);
out.write(fxp[0]);
out.write(fxp[1]);
out.write((fxc[2]) | fxc[3] << 4);
out.write(fxp[2]);
out.write(fxp[3]);
out.write(note[0] | (sample[0] == 0 ? 0x00 : 0x80));
out.write(note[1] | (sample[1] == 0 ? 0x00 : 0x80));
out.write(note[2] | (sample[2] == 0 ? 0x00 : 0x80));
}
}
}*/
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