File size: 5,054 Bytes
69c3cbe | 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 | #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 const 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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