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add bilinear filtering, fix more bugs

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still lots of clicks and pops; i'll probably add a per-channel lowpass
filter
This commit is contained in:
Andy Sloane 2015-10-23 14:27:23 -07:00
commit 15a848d797
1 changed files with 10 additions and 3 deletions
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13
xm.js
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@ -194,12 +194,19 @@ function audio_cb(e) {
if (volL < 0) volL = 0;
if (volR < 0) volR = 0;
if (volR == 0 && volL == 0)
break;
continue;
var k = channelinfo[j].off;
var dk = channelinfo[j].doff;
// console.log(j, offset, channelinfo[j]);
for (var i = offset; i < offset+tickduration; i++) {
var si = samp[k|0]; // TODO: bilinear filtering
var kk = k|0;
var si = samp[kk];
// bilinear filtering
var sj = si;
if (kk < sample_end-1)
sj = samp[kk+1];
var t = k - kk;
si = t * sj + (1 - t) * si;
dataL[i] += volL * si;
dataR[i] += volR * si;
k += dk;
@ -293,7 +300,7 @@ function playXM(arrayBuf) {
var note = -1, inst = -1, vol = -1, efftype = -1, effparam = -1;
if (byte0 & 0x80) {
if (byte0 & 0x01) {
note = dv.getUint8(idx); idx++;
note = dv.getUint8(idx) - 1; idx++;
}
if (byte0 & 0x02) {
inst = dv.getUint8(idx); idx++;