implemented multiple samples / instrument
This commit is contained in:
Andy Sloane
parent
22dd555228
commit
c4370f447c
2 changed files with 77 additions and 63 deletions
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@ -17,7 +17,6 @@ todo:
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- make display even more faithfully FT2-like
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- render instrument list in ft2 font
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- oscilloscope trigger on zero crossing or something
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- multi-sample instruments
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- missing XM effects:
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- E3x, E4x, E5x, E6x, E7x, E9x, EDx, EEx
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- 7xy - tremolo
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139
xm.js
139
xm.js
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@ -154,7 +154,7 @@ function UpdateChannelPeriod(ch, period) {
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}
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function PeriodForNote(ch, note) {
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return 1920 - note*16 - ch.inst.fine / 8.0;
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return 1920 - (note + ch.samp.note)*16 - ch.samp.fine / 8.0;
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}
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var audio_events = [];
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@ -252,8 +252,10 @@ function next_row() {
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ch.inst = inst;
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// retrigger unless overridden below
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triggernote = true;
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ch.pan = inst.pan;
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ch.vol = inst.vol;
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if (ch.samp) {
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ch.vol = ch.samp.vol;
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ch.pan = ch.samp.pan;
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}
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} else {
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// console.log("invalid inst", r[i][1], instruments.length);
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}
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@ -266,9 +268,12 @@ function next_row() {
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triggernote = false;
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} else {
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if (inst != undefined) {
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var note = r[i][0] + inst.note;
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var note = r[i][0];
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ch.note = note;
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triggernote = true;
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ch.samp = inst.samples[inst.samplemap[ch.note]];
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ch.pan = ch.samp.pan;
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ch.vol = ch.samp.vol;
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}
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}
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}
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@ -455,7 +460,7 @@ function MixSilenceIntoBuf(ch, start, end, dataL, dataR) {
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function MixChannelIntoBuf(ch, start, end, dataL, dataR) {
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var inst = ch.inst;
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var samp, sample_end;
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var instsamp = ch.samp;
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var loop = false;
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var looplen = 0, loopstart = 0;
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@ -464,15 +469,15 @@ function MixChannelIntoBuf(ch, start, end, dataL, dataR) {
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return MixSilenceIntoBuf(ch, start, end, dataL, dataR);
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}
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samp = inst.sampledata;
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sample_end = inst.len;
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if ((inst.type & 3) == 1) { // todo: support pingpong
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var samp = instsamp.sampledata;
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var sample_end = instsamp.len;
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if ((instsamp.type & 3) == 1) { // todo: support pingpong
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loop = true;
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loopstart = inst.loop;
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looplen = inst.looplen;
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loopstart = instsamp.loop;
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looplen = instsamp.looplen;
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sample_end = loopstart + looplen;
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}
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var samplen = inst.len;
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var samplen = instsamp.len;
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var volE = ch.volE / 64.0; // current volume envelope
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var panE = 4*(ch.panE - 32); // current panning envelope
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var p = panE + ch.pan - 128; // final pan
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@ -703,33 +708,34 @@ function ConvertSample(array, bits) {
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// optimization: unroll short sample loops so we can run our inner mixing loop
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// uninterrupted for as long as possible; this also handles pingpong loops.
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function UnrollSampleLoop(inst) {
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var nloops = ((2048 + inst.looplen - 1) / inst.looplen) | 0;
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var pingpong = inst.type & 2;
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function UnrollSampleLoop(samp) {
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var nloops = ((2048 + samp.looplen - 1) / samp.looplen) | 0;
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console.log(samp.looplen, nloops);
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var pingpong = samp.type & 2;
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if (pingpong) {
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// make sure we have an even number of loops if we are pingponging
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nloops = (nloops + 1) & (~1);
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}
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var samplesiz = inst.loop + nloops * inst.looplen;
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var samp = new Float32Array(samplesiz);
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for (var i = 0; i < inst.loop; i++) {
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samp[i] = inst.sampledata[i];
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var samplesiz = samp.loop + nloops * samp.looplen;
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var data = new Float32Array(samplesiz);
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for (var i = 0; i < samp.loop; i++) {
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data[i] = samp.sampledata[i];
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}
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for (var j = 0; j < nloops; j++) {
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if ((j&1) && pingpong) {
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for (var k = inst.looplen - 1; k >= 0; k--) {
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samp[i++] = inst.sampledata[inst.loop + k];
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for (var k = samp.looplen - 1; k >= 0; k--) {
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data[i++] = samp.sampledata[samp.loop + k];
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}
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} else {
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for (var k = 0; k < inst.looplen; k++) {
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samp[i++] = inst.sampledata[inst.loop + k];
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for (var k = 0; k < samp.looplen; k++) {
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data[i++] = samp.sampledata[samp.loop + k];
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}
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}
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}
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console.log("unrolled sample loop", inst.number, "looplen", inst.looplen, "x", nloops, " = ", samplesiz);
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inst.sampledata = samp;
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inst.looplen = nloops * inst.looplen;
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inst.type = 1;
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console.log("unrolled sample loop; looplen", samp.looplen, "x", nloops, " = ", samplesiz);
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samp.sampledata = data;
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samp.looplen = nloops * samp.looplen;
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samp.type = 1;
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}
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function playXM(arrayBuf) {
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@ -829,6 +835,10 @@ function playXM(arrayBuf) {
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var instname = getstring(dv, idx+0x4, 22);
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var nsamp = dv.getUint16(idx+0x1b, true);
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if (nsamp > 0) {
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// return a slice so we have a fresh copy and don't retain pointers to
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// the original xm file arraybuf forever
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var samplemap = new Uint8Array(arrayBuf, idx+33, 96).slice();
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var env_nvol = dv.getUint8(idx+225);
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var env_vol_type = dv.getUint8(idx+233);
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var env_vol_sustain = dv.getUint8(idx+227);
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@ -855,29 +865,48 @@ function playXM(arrayBuf) {
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hdrsiz, i, instname, nsamp, samphdrsiz);
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idx += hdrsiz;
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var totalsamples = 0;
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var samps = [];
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for (var j = 0; j < nsamp; j++) {
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var samplen = dv.getUint32(idx, true);
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if (j == 0) {
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var samplen0 = samplen; // FIXME HACK HACK HACK
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var samploop = dv.getUint32(idx+4, true);
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var samplooplen = dv.getUint32(idx+8, true);
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var sampvol = dv.getUint8(idx+12);
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var sampfinetune = dv.getInt8(idx+13);
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var samptype = dv.getUint8(idx+14);
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var samppan = dv.getUint8(idx+15);
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var sampnote = dv.getInt8(idx+16);
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var sampname = getstring(dv, idx+18, 22);
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var sampleoffset = idx + samphdrsiz;
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console.log("sample %d: len %d name '%s' loop %d/%d vol %d",
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j, samplen, sampname, samploop, samplooplen, sampvol);
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console.log(" type %d note %s(%d) finetune %d pan %d",
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samptype, prettify_note(sampnote + 12*4), sampnote, sampfinetune, samppan);
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console.log(" vol env", env_vol, env_vol_sustain,
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env_vol_loop_start, env_vol_loop_end, "type", env_vol_type,
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"fadeout", vol_fadeout);
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console.log(" pan env", env_pan, env_pan_sustain,
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env_pan_loop_start, env_pan_loop_end, "type", env_pan_type);
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var samploop = dv.getUint32(idx+4, true);
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var samplooplen = dv.getUint32(idx+8, true);
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var sampvol = dv.getUint8(idx+12);
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var sampfinetune = dv.getInt8(idx+13);
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var samptype = dv.getUint8(idx+14);
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var samppan = dv.getUint8(idx+15);
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var sampnote = dv.getInt8(idx+16);
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var sampname = getstring(dv, idx+18, 22);
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var sampleoffset = idx + samphdrsiz + totalsamples;
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console.log("sample %d: len %d name '%s' loop %d/%d vol %d",
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j, samplen, sampname, samploop, samplooplen, sampvol);
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console.log(" type %d note %s(%d) finetune %d pan %d",
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samptype, prettify_note(sampnote + 12*4), sampnote, sampfinetune, samppan);
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console.log(" vol env", env_vol, env_vol_sustain,
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env_vol_loop_start, env_vol_loop_end, "type", env_vol_type,
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"fadeout", vol_fadeout);
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console.log(" pan env", env_pan, env_pan_sustain,
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env_pan_loop_start, env_pan_loop_end, "type", env_pan_type);
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var samp = {
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'len': samplen, 'loop': samploop,
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'looplen': samplooplen, 'note': sampnote, 'fine': sampfinetune,
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'pan': samppan, 'type': samptype, 'vol': sampvol,
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'fine': sampfinetune,
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'sampledata': ConvertSample(
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new Uint8Array(arrayBuf, sampleoffset, samplen), samptype & 16),
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};
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// length / pointers are all specified in bytes; fixup for 16-bit samples
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if (samptype & 16) {
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samp.len /= 2;
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samp.loop /= 2;
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samp.looplen /= 2;
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}
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// unroll short loops and any pingpong loops
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if ((samp.type & 3) && (samp.looplen < 2048 || (samp.type & 2))) {
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UnrollSampleLoop(samp);
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}
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samps.push(samp);
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idx += samphdrsiz;
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totalsamples += samplen;
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}
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@ -885,24 +914,10 @@ function playXM(arrayBuf) {
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inst = {
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'name': instname,
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'number': i,
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'len': samplen0, 'loop': samploop,
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'looplen': samplooplen, 'note': sampnote, 'fine': sampfinetune,
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'pan': samppan, 'type': samptype, 'vol': sampvol,
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'fine': sampfinetune,
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'fadeout': vol_fadeout,
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'sampledata': ConvertSample(new Uint8Array(arrayBuf, sampleoffset, samplen0), samptype & 16),
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'samplemap': samplemap,
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'samples': samps,
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};
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if (samptype & 16) {
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inst.len /= 2;
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inst.loop /= 2;
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inst.looplen /= 2;
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}
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// unroll short loops and any pingpong loops
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if ((inst.type & 3) && (inst.looplen < 2048 || (inst.type & 2))) {
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UnrollSampleLoop(inst);
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}
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if (env_vol_type) {
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// insert an automatic fadeout to 0 at the end of the envelope
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var env_end_tick = env_vol[env_vol.length-2];
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