Demos/jsxm
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really basic test runner

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npm test now does... something somewhat useful.

now to write a bunch of tests.
This commit is contained in:
Andy Sloane 2015-11-11 22:27:53 -08:00
commit 7ca90f9b98
5 changed files with 116 additions and 20 deletions
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37
xm.js
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@ -9,7 +9,7 @@ if (!window.XMView) {
}
var XMView = window.XMView;
player.PeriodForNote = PeriodForNote;
player.periodForNote = periodForNote;
player.prettify_effect = prettify_effect;
player.initAudio = initAudio;
player.loadXM = loadXM;
@ -23,6 +23,10 @@ player.cur_ticksamp = 0;
player.cur_tick = 6;
player.xm = {}; // contains all song data
// exposed for testing
player.nextTick = nextTick;
player.Envelope = Envelope;
// for pretty-printing notes
var _note_names = [
"C-", "C#", "D-", "D#", "E-", "F-",
@ -30,6 +34,10 @@ var _note_names = [
var f_smp = 44100; // updated by play callback, default value here
// per-sample exponential moving average for volume changes (to prevent pops
// and clicks); evaluated every 8 samples
var popfilter_alpha = 0.9837;
function prettify_note(note) {
if (note < 0) return "---";
if (note == 96) return "^^^";
@ -72,7 +80,7 @@ function getstring(dv, offset, len) {
// Return 2-pole Butterworth lowpass filter coefficients for
// center frequncy f_c (relative to sampling frequency)
function FilterCoeffs(f_c) {
function filterCoeffs(f_c) {
if (f_c > 0.5) { // we can't lowpass above the nyquist frequency...
f_c = 0.5;
}
@ -84,24 +92,21 @@ function FilterCoeffs(f_c) {
return [gain, 2*c, -c*c - s*s];
}
popfilter = FilterCoeffs(200.0 / 44100.0);
popfilter_alpha = 0.9837;
function UpdateChannelPeriod(ch, period) {
function updateChannelPeriod(ch, period) {
var freq = 8363 * Math.pow(2, (1152.0 - period) / 192.0);
if (isNaN(freq)) {
console.log("invalid period!", period);
return;
}
ch.doff = freq / f_smp;
ch.filter = FilterCoeffs(ch.doff / 2);
ch.filter = filterCoeffs(ch.doff / 2);
}
function PeriodForNote(ch, note) {
function periodForNote(ch, note) {
return 1920 - (note + ch.samp.note)*16 - ch.samp.fine / 8.0;
}
function next_row() {
function nextRow() {
if (player.cur_pat == -1 || player.cur_row >= player.xm.patterns[player.cur_pat].length) {
player.cur_row = 0;
player.cur_songpos++;
@ -196,7 +201,7 @@ function next_row() {
// special handling for portamentos: don't trigger the note
if (ch.effect == 3 || ch.effect == 5) {
if (r[i][0] != -1) {
ch.periodtarget = PeriodForNote(ch, ch.note);
ch.periodtarget = periodForNote(ch, ch.note);
}
triggernote = false;
if (inst && inst.samplemap) {
@ -224,7 +229,7 @@ function next_row() {
ch.env_vol = new EnvelopeFollower(inst.env_vol);
ch.env_pan = new EnvelopeFollower(inst.env_pan);
if (ch.note != undefined) {
ch.period = PeriodForNote(ch, ch.note);
ch.period = periodForNote(ch, ch.note);
}
}
}
@ -279,11 +284,11 @@ EnvelopeFollower.prototype.Tick = function(release) {
return value;
};
function next_tick() {
function nextTick() {
player.cur_tick++;
if (player.cur_tick >= player.xm.tempo) {
player.cur_tick = 0;
next_row();
nextRow();
}
for (var j = 0; j < player.xm.nchan; j++) {
var ch = player.xm.channelinfo[j];
@ -305,7 +310,7 @@ function next_tick() {
}
ch.volE = ch.env_vol.Tick(ch.release);
ch.panE = ch.env_pan.Tick(ch.release);
UpdateChannelPeriod(ch, ch.period + ch.periodoffset);
updateChannelPeriod(ch, ch.period + ch.periodoffset);
}
}
@ -386,7 +391,7 @@ function MixChannelIntoBuf(ch, start, end, dataL, dataR) {
var i = start;
var failsafe = 100;
while (i < end) {
if (failsafe-- == 0) {
if (failsafe-- === 0) {
console.log("failsafe in mixing loop! channel", ch.number, k, sample_end,
loopstart, looplen, dk);
break;
@ -518,7 +523,7 @@ function audio_cb(e) {
while(buflen > 0) {
if (player.cur_pat == -1 || player.cur_ticksamp >= ticklen) {
next_tick(f_smp);
nextTick(f_smp);
player.cur_ticksamp -= ticklen;
}
var tickduration = Math.min(buflen, ticklen - player.cur_ticksamp);