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sf2.js
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"use strict";
(function() {
var SoundFont2 = function() {
this.sfbuffer = null;
this.sfdata = null;
this.banks = null;
}
SoundFont2.prototype = {
input: function(sfdata) {
this.parse(sfdata);
this.organize();
},
parse: function(sfbuffer) {
var offset;
this.sfbuffer = sfbuffer;
this.sfdata = new Uint8Array(sfbuffer);
if (! this.matchFourCC(0, 'RIFF')) {
console.error("not RIFF format");
return false;
}
this.RIFFSize = this.getDWORD(4);
if (! this.matchFourCC(8, 'sfbk')) {
console.error("not sfbk Chunk");
return false;
}
this.info = this.parseLISTChunkInfo(12, 'INFO');
this.stda = this.parseLISTChunkInfo(this.info['NextChunkOffset'],
'sdta');
this.ptda = this.parseLISTChunkInfo(this.stda['NextChunkOffset'],
'pdta');
},
matchFourCC: function(o, id) {
var d = this.sfdata;
if (d[o++] === id.charCodeAt(0) && d[o++] === id.charCodeAt(1) &&
d[o++] === id.charCodeAt(2) && d[o] === id.charCodeAt(3)) {
return true;
}
return false;
},
getBYTE: function(o) { // uint8
var d = this.sfdata;
return d[o];
},
getCHAR: function(o) { // sint8
var v = this.sfdata[o];
return (v<0x80)?v:(v-0x100);
},
getWORD: function(o) { // uint16
var d = this.sfdata;
return d[o] + 0x100*d[o+1];
},
getSHORT: function(o) { // sint16
var v = this.getWORD(o);
return (v<0x8000)?v:(v-0x10000);
},
getDWORD: function(o) { // uint32
var d = this.sfdata;
return d[o] + 0x100*(d[o+1] + 0x100*(d[o+2] + 0x100*d[o+3]));
},
getString: function(o, len) {
var d = this.sfdata;
var s = [];
while (len--) {
var c = d[o++];
if (c === 0) { // null terminate
break;
}
s.push(String.fromCharCode(c));
}
return s.join('');
},
parseLISTChunkInfo: function(o, listId) {
var chunkInfo = {offset:o, id:listId};
var listChunkSize;
if (! this.matchFourCC(o, 'LIST')) {
console.error("not LIST chunk");
return {};
}
listChunkSize = this.getDWORD(o + 4);
var nextChunkOffset = o + 8 + listChunkSize;
if (! this.matchFourCC(o + 8, listId)) {
id = this.getString(o + 8, 4);
console.error("not "+listId+" chunk ("+id+")");
return {};
}
o = o + 12 ;
while ( o < nextChunkOffset) {
var id = this.getString(o, 4);
var size = this.getDWORD(o + 4);
chunkInfo[id] = {id:id, offset:o, size:size};
o += 8;
chunkInfo[id]['detail'] = this.parseChunkInfo(id, o, size);
o += size;
}
chunkInfo['ListChunkSize'] = listChunkSize;;
chunkInfo['NextChunkOffset'] = nextChunkOffset;
return chunkInfo;
},
parseChunkInfo: function(id, o, size, chunkInfo) {
var nextOffset = o + size;
var detail = [];
while (o < nextOffset) {
switch(id) {
case 'phdr': // preset header
var preset = {
name: this.getString(o, 20),
preset: this.getWORD(o + 20),
bank: this.getWORD(o + 22),
bagNdx: this.getWORD(o + 24),
library: this.getDWORD(o + 26),
genre: this.getDWORD(o + 30),
morphologyGenre: this.getDWORD(o + 34),
};
o += 38;
detail.push(preset);
break;
case 'pbag': // preset bag
case 'ibag': // instrument bag
var bag = {
genNdx: this.getWORD(o),
modNdx: this.getWORD(o + 2),
};
o += 4;
detail.push(bag);
break;
case 'pgen': // preset generator
case 'igen': // instrument generator
var oper = this.getWORD(o);
var gen = { oper: oper };
if (oper === 43 || oper === 44) {
gen['lo'] = this.getBYTE(o + 2);
gen['hi'] = this.getBYTE(o + 3);
} else {
gen['amount'] = this.getWORD(o + 2);
}
o += 4;
detail.push(gen);
break;
case 'pmod': // preset modulator
case 'imod': // instrument modulator
var modBits = this.getWORD(o);
var mod = {
type: modBits >> 10,
p: (modBits >> 9) & 1,
d: (modBits >> 8) & 1,
cc: (modBits >> 7) & 1,
index: modBits & 0x3f,
};
o += 2;
detail.push(mod);
break;
case 'inst': // instrument
var inst = {
name: this.getString(o, 20),
bagNdx: this.getWORD(o + 20),
}
o += 22;
detail.push(inst);
break;
case 'shdr': // sample header
var sample = {
name: this.getString(o, 20),
start: this.getDWORD(o + 20),
end: this.getDWORD(o + 24),
startLoop: this.getDWORD(o + 28),
endLoop: this.getDWORD(o + 32),
sampleRate: this.getDWORD(o + 36),
originalPitch: this.getBYTE(o + 40),
pitchCorrection: this.getBYTE(o + 41), // XXX
sampleLink: this.getWORD(o + 42),
sampleType: this.getWORD(o + 44),
}
o += 46;
detail.push(sample);
break;
default:
nextOffset = -1; // end
break;
}
}
if (detail.length) {
return detail;
}
return null;
},
organize: function() {
this.banks = {};
var presets = this.ptda['phdr']['detail'];
var pbags = this.ptda['pbag']['detail'];
for (var i = 0, n = presets.length ; i < n ; i++) {
var preset = presets[i];
var bankId = preset['bank'];
var presetId = preset['preset'];
if ((bankId in this.banks) === false) {
this.banks[bankId] = {};
}
this.banks[bankId][presetId] = preset;
// this.organizeBag(presets, preset, 'pbag', 'pgen', 'pmod');
}
},
getPresetDetail: function(bankId, presetId) {
console.log('getPresetDetail('+bankId+","+presetId+")");
var banks = this.banks;
if ((bankId in banks) && (presetId in banks[bankId]) &&
('bags' in banks[bankId][presetId])) {
return banks[bankId][presetId];
}
var presets = this.ptda['phdr']['detail'];
console.log(presets.length);
for (var i = 0, n = presets.length ; i < n ; i++) {
var preset = presets[i];
if ((preset['bank'] == bankId) && (preset['preset'] == presetId)) {
if ((bankId in banks) === false) {
this.banks[bankId] = {};
}
this.banks[bankId][presetId] = preset;
this.organizeBag(presets, preset, 'pbag', 'pgen', 'pmod');
console.log(preset);
return preset;
}
}
console.error("not found preset: bankId"+bankId+" presetId"+presetId);
return null;
},
organizeBag: function(presets_insts, preset_inst,
bagId, genId, modId) {
var bags = this.ptda[bagId]['detail'];
var gens = this.ptda[genId]['detail'];
var mods = this.ptda[modId]['detail'];
var insts = this.ptda['inst']['detail'];
var samples = this.ptda['shdr']['detail'];
var startBag = preset_inst['bagNdx'];
if (bagId + 1 < presets_insts.length) {
var endBag = presets_insts[bagId + 1]['bagNdx'] - 1;
} else {
var endBag = bags.length - 1;
}
preset_inst['bags'] = [];
if (preset_inst['name'] === 'Acoustic Piano HV1') {
console.log(startBag+"=>"+endBag);
}
for (var bagIdx = startBag ; bagIdx <= endBag ; bagIdx++) {
var bag = bags[bagIdx]
preset_inst['bags'].push(bag);
var startGen = bag['genNdx'];
var startMod = bag['modNdx'];
if (bagIdx < (bags.length -1)) {
var endGen = bags[bagIdx+1]['genNdx'] - 1;
var endMod = bags[bagIdx+1]['modNdx'] - 1;
} else {
var endGen = gens.length - 1;
var endMod = mods.length - 1;
}
bag['gens'] = {};
for (var genIdx = startGen ; genIdx <= endGen ; genIdx++) {
var gen = gens[genIdx];
var oper = gen['oper'];
bag['gens'][oper] = gen;
if (oper === 41) { // instrument
var inst = insts[gen['amount']];
this.organizeBag(insts, inst, 'ibag', 'igen', 'imod');
gen['inst'] = inst;
} else if (oper === 53) { // sampleID
gen['sample'] = samples[gen['amount']];
}
}
bag['mods'] = []; // XXX
for (var modIdx = startMod ; modIdx <= endMod ; modIdx++) {
var mod = mods[modIdx];
bag['mods'].push(mod); // XXX
}
}
},
getBanks: function() {
return this.banks;
},
};
window.SoundFont2 = SoundFont2;
})();