102 lines
2.5 KiB
JavaScript
102 lines
2.5 KiB
JavaScript
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//
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// sbnk.js
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//--------------------
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// Reads sbnk files.
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// by RHY3756547
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//
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// includes: gl-matrix.js (glMatrix 2.0)
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//
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window.sbnk = function(input, dataView) {
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var t = this;
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this.load = load;
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function load(input, dataView) {
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var view = (dataView)?input:(new DataView(input));
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var header = null;
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var offset = 0;
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var stamp = readChar(view, 0x0)+readChar(view, 0x1)+readChar(view, 0x2)+readChar(view, 0x3);
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if (stamp != "SBNK") throw "SWAV invalid. Expected SWAV, found "+stamp;
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offset += 16;
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var data = readChar(view, offset)+readChar(view, offset+1)+readChar(view, offset+2)+readChar(view, offset+3);
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if (data != "DATA") throw "SWAV invalid, expected DATA, found "+data;
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offset += 8;
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offset += 32; //skip reserved
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var numInst = view.getUint32(offset, true);
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t.instruments = [];
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offset += 4;
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for (var i=0; i<numInst; i++) {
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var fRecord = view.getUint8(offset);
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var nOffset = view.getUint16(offset+1, true);
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if (fRecord == 0) {
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t.instruments.push({type:0});
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} else if (fRecord < 16) { //note/wave definition
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var obj = readParams(view, nOffset);
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obj.type = 1;
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t.instruments.push(obj);
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} else if (fRecord == 16) {
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var obj = {};
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obj.lower = view.getUint8(nOffset++);
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obj.upper = view.getUint8(nOffset++);
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obj.entries = []
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var notes = (obj.upper-obj.lower)+1;
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for (var j=0; j<notes; j++) {
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obj.entries.push(readParams(view, nOffset+2));
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nOffset += 12;
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}
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obj.type = 2;
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t.instruments.push(obj);
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} else if (fRecord == 17) {
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var obj = {};
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obj.regions = [];
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for (var j=0; j<8; j++) {
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var dat = view.getUint8(nOffset+j);
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if (dat != 0) obj.regions.push(dat);
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else break;
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}
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obj.entries = [];
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nOffset += 8;
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for (var j=0; j<obj.regions.length; j++) {
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obj.entries.push(readParams(view, nOffset+2));
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nOffset += 12;
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}
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obj.type = 3;
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t.instruments.push(obj);
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}
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offset += 4;
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}
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}
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function readParams(view, off) {
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var obj = {};
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obj.swav = view.getUint16(off, true);
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obj.swar = view.getUint16(off+2, true);
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obj.note = view.getUint8(off+4);
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obj.freq = noteToFreq(obj.note);
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obj.attack = view.getUint8(off+5);
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obj.decay = view.getUint8(off+6);
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obj.sustainLvl = view.getUint8(off+7);
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obj.release = view.getUint8(off+8);
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obj.pan = view.getUint8(off+9);
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return obj;
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}
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function noteToFreq(n) {
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return Math.pow(2, (n-49)/12)*440;
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}
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function readChar(view, offset) {
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return String.fromCharCode(view.getUint8(offset));
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}
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if (input != null) {
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load(input, dataView);
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}
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}
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