diff --git a/html/xm.js b/html/xm.js
deleted file mode 100644
index bf53651..0000000
--- a/html/xm.js
+++ /dev/null
@@ -1,1351 +0,0 @@
-/*
-
-The MIT License (MIT)
-
-Copyright (c) 2015 Andy Sloane
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
-
-*/
-
-(function (window) {
-if (!window.XMPlayer) {
- window.XMPlayer = {};
-}
-var player = window.XMPlayer;
-
-if (!window.XMView) {
- window.XMView = {};
-}
-var XMView = window.XMView;
-
-player.periodForNote = periodForNote;
-player.prettify_effect = prettify_effect;
-player.init = init;
-player.load = load;
-player.play = play;
-player.pause = pause;
-player.stop = stop;
-player.cur_songpos = -1;
-player.cur_pat = -1;
-player.cur_row = 64;
-player.cur_ticksamp = 0;
-player.cur_tick = 6;
-player.xm = {}; // contains all song data
-player.xm.global_volume = player.max_global_volume = 128;
-
-// exposed for testing
-player.nextTick = nextTick;
-player.nextRow = nextRow;
-player.Envelope = Envelope;
-
-// for pretty-printing notes
-var _note_names = [
- "C-", "C#", "D-", "D#", "E-", "F-",
- "F#", "G-", "G#", "A-", "A#", "B-"];
-
-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 "^^^";
- return _note_names[note%12] + ~~(note/12);
-}
-
-function prettify_number(num) {
- if (num == -1) return "--";
- if (num < 10) return "0" + num;
- return num;
-}
-
-function prettify_volume(num) {
- if (num < 0x10) return "--";
- return num.toString(16);
-}
-
-function prettify_effect(t, p) {
- if (t >= 10) t = String.fromCharCode(55 + t);
- if (p < 16) p = '0' + p.toString(16);
- else p = p.toString(16);
- return t + p;
-}
-
-function prettify_notedata(data) {
- return (prettify_note(data[0]) + " " + prettify_number(data[1]) + " " +
- prettify_volume(data[2]) + " " +
- prettify_effect(data[3], data[4]));
-}
-
-function getstring(dv, offset, len) {
- var str = [];
- for (var i = offset; i < offset+len; i++) {
- var c = dv.getUint8(i);
- if (c === 0) break;
- str.push(String.fromCharCode(c));
- }
- return str.join('');
-}
-
-// Return 2-pole Butterworth lowpass filter coefficients for
-// center frequncy f_c (relative to sampling frequency)
-function filterCoeffs(f_c) {
- if (f_c > 0.5) { // we can't lowpass above the nyquist frequency...
- f_c = 0.5;
- }
- var wct = Math.sqrt(2) * Math.PI * f_c;
- var e = Math.exp(-wct);
- var c = e * Math.cos(wct);
- var gain = (1 - 2*c + e*e) / 2;
- return [gain, 2*c, -e*e];
-}
-
-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);
-}
-
-function periodForNote(ch, note) {
- return 1920 - (note + ch.samp.note)*16 - ch.fine / 8.0;
-}
-
-function setCurrentPattern() {
- var nextPat = player.xm.songpats[player.cur_songpos];
-
- // check for out of range pattern index
- while (nextPat >= player.xm.patterns.length) {
- if (player.cur_songpos + 1 < player.xm.songpats.length) {
- // first try skipping the position
- player.cur_songpos++;
- } else if ((player.cur_songpos === player.xm.song_looppos && player.cur_songpos !== 0)
- || player.xm.song_looppos >= player.xm.songpats.length) {
- // if we allready tried song_looppos or if song_looppos
- // is out of range, go to the first position
- player.cur_songpos = 0;
- } else {
- // try going to song_looppos
- player.cur_songpos = player.xm.song_looppos;
- }
-
- nextPat = player.xm.songpats[player.cur_songpos];
- }
-
- player.cur_pat = nextPat;
-}
-
-function nextRow() {
- if(typeof player.next_row === "undefined") { player.next_row = player.cur_row + 1; }
- player.cur_row = player.next_row;
- player.next_row++;
-
- if (player.cur_pat == -1 || player.cur_row >= player.xm.patterns[player.cur_pat].length) {
- player.cur_row = 0;
- player.next_row = 1;
- player.cur_songpos++;
- if (player.cur_songpos >= player.xm.songpats.length)
- player.cur_songpos = player.xm.song_looppos;
- setCurrentPattern();
- }
- var p = player.xm.patterns[player.cur_pat];
- var r = p[player.cur_row];
- for (var i = 0; i < r.length; i++) {
- var ch = player.xm.channelinfo[i];
- var inst = ch.inst;
- var triggernote = false;
- // instrument trigger
- if (r[i][1] != -1) {
- inst = player.xm.instruments[r[i][1] - 1];
- if (inst && inst.samplemap) {
- ch.inst = inst;
- // retrigger unless overridden below
- triggernote = true;
- if (ch.note && inst.samplemap) {
- ch.samp = inst.samples[inst.samplemap[ch.note]];
- ch.vol = ch.samp.vol;
- ch.pan = ch.samp.pan;
- ch.fine = ch.samp.fine;
- }
- } else {
- // console.log("invalid inst", r[i][1], instruments.length);
- }
- }
-
- // note trigger
- if (r[i][0] != -1) {
- if (r[i][0] == 96) {
- ch.release = 1;
- triggernote = false;
- } else {
- if (inst && inst.samplemap) {
- var note = r[i][0];
- ch.note = note;
- ch.samp = inst.samples[inst.samplemap[ch.note]];
- if (triggernote) {
- // if we were already triggering the note, reset vol/pan using
- // (potentially) new sample
- ch.pan = ch.samp.pan;
- ch.vol = ch.samp.vol;
- ch.fine = ch.samp.fine;
- }
- triggernote = true;
- }
- }
- }
-
- ch.voleffectfn = undefined;
- if (r[i][2] != -1) { // volume column
- var v = r[i][2];
- ch.voleffectdata = v & 0x0f;
- if (v < 0x10) {
- console.log("channel", i, "invalid volume", v.toString(16));
- } else if (v <= 0x50) {
- ch.vol = v - 0x10;
- } else if (v >= 0x60 && v < 0x70) { // volume slide down
- ch.voleffectfn = function(ch) {
- ch.vol = Math.max(0, ch.vol - ch.voleffectdata);
- };
- } else if (v >= 0x70 && v < 0x80) { // volume slide up
- ch.voleffectfn = function(ch) {
- ch.vol = Math.min(64, ch.vol + ch.voleffectdata);
- };
- } else if (v >= 0x80 && v < 0x90) { // fine volume slide down
- ch.vol = Math.max(0, ch.vol - (v & 0x0f));
- } else if (v >= 0x90 && v < 0xa0) { // fine volume slide up
- ch.vol = Math.min(64, ch.vol + (v & 0x0f));
- } else if (v >= 0xa0 && v < 0xb0) { // vibrato speed
- ch.vibratospeed = v & 0x0f;
- } else if (v >= 0xb0 && v < 0xc0) { // vibrato w/ depth
- ch.vibratodepth = v & 0x0f;
- ch.voleffectfn = player.effects_t1[4]; // use vibrato effect directly
- player.effects_t1[4](ch); // and also call it on tick 0
- } else if (v >= 0xc0 && v < 0xd0) { // set panning
- ch.pan = (v & 0x0f) * 0x11;
- } else if (v >= 0xf0 && v <= 0xff) { // portamento
- if (v & 0x0f) {
- ch.portaspeed = (v & 0x0f) << 4;
- }
- ch.voleffectfn = player.effects_t1[3]; // just run 3x0
- } else {
- console.log("channel", i, "volume effect", v.toString(16));
- }
- }
-
- ch.effect = r[i][3];
- ch.effectdata = r[i][4];
- if (ch.effect < 36) {
- ch.effectfn = player.effects_t1[ch.effect];
- var eff_t0 = player.effects_t0[ch.effect];
- if (eff_t0 && eff_t0(ch, ch.effectdata)) {
- triggernote = false;
- }
- } else {
- console.log("channel", i, "effect > 36", ch.effect);
- }
-
- // special handling for portamentos: don't trigger the note
- if (ch.effect == 3 || ch.effect == 5 || r[i][2] >= 0xf0) {
- if (r[i][0] != -1) {
- ch.periodtarget = periodForNote(ch, ch.note);
- }
- triggernote = false;
- if (inst && inst.samplemap) {
- if (ch.env_vol == undefined) {
- // note wasn't already playing; we basically have to ignore the
- // portamento and just trigger
- triggernote = true;
- } else if (ch.release) {
- // reset envelopes if note was released but leave offset/pitch/etc
- // alone
- ch.envtick = 0;
- ch.release = 0;
- ch.env_vol = new EnvelopeFollower(inst.env_vol);
- ch.env_pan = new EnvelopeFollower(inst.env_pan);
- }
- }
- }
-
- if (triggernote) {
- // there's gotta be a less hacky way to handle offset commands...
- if (ch.effect != 9) ch.off = 0;
- ch.release = 0;
- ch.envtick = 0;
- ch.env_vol = new EnvelopeFollower(inst.env_vol);
- ch.env_pan = new EnvelopeFollower(inst.env_pan);
- if (ch.note) {
- ch.period = periodForNote(ch, ch.note);
- }
- // waveforms 0-3 are retriggered on new notes while 4-7 are continuous
- if (ch.vibratotype < 4) {
- ch.vibratopos = 0;
- }
- }
- }
-}
-
-function Envelope(points, type, sustain, loopstart, loopend) {
- this.points = points;
- this.type = type;
- this.sustain = sustain;
- this.loopstart = points[loopstart*2];
- this.loopend = points[loopend*2];
-}
-
-Envelope.prototype.Get = function(ticks) {
- // TODO: optimize follower with ptr
- // or even do binary search here
- var y0;
- var env = this.points;
- for (var i = 0; i < env.length; i += 2) {
- y0 = env[i+1];
- if (ticks < env[i]) {
- var x0 = env[i-2];
- y0 = env[i-1];
- var dx = env[i] - x0;
- var dy = env[i+1] - y0;
- return y0 + (ticks - x0) * dy / dx;
- }
- }
- return y0;
-};
-
-function EnvelopeFollower(env) {
- this.env = env;
- this.tick = 0;
-}
-
-EnvelopeFollower.prototype.Tick = function(release) {
- var value = this.env.Get(this.tick);
-
- // if we're sustaining a note, stop advancing the tick counter
- if (!release && this.tick >= this.env.points[this.env.sustain*2]) {
- return this.env.points[this.env.sustain*2 + 1];
- }
-
- this.tick++;
- if (this.env.type & 4) { // envelope loop?
- if (!release &&
- this.tick >= this.env.loopend) {
- this.tick -= this.env.loopend - this.env.loopstart;
- }
- }
- return value;
-};
-
-function nextTick() {
- player.cur_tick++;
- var j, ch;
- for (j = 0; j < player.xm.nchan; j++) {
- ch = player.xm.channelinfo[j];
- ch.periodoffset = 0;
- }
- if (player.cur_tick >= player.xm.tempo) {
- player.cur_tick = 0;
- nextRow();
- }
- for (j = 0; j < player.xm.nchan; j++) {
- ch = player.xm.channelinfo[j];
- var inst = ch.inst;
- if (player.cur_tick !== 0) {
- if(ch.voleffectfn) ch.voleffectfn(ch);
- if(ch.effectfn) ch.effectfn(ch);
- }
- if (isNaN(ch.period)) {
- console.log(prettify_notedata(
- player.xm.patterns[player.cur_pat][player.cur_row][j]),
- "set channel", j, "period to NaN");
- }
- if (inst === undefined) continue;
- if (ch.env_vol === undefined) {
- console.log(prettify_notedata(
- player.xm.patterns[player.cur_pat][player.cur_row][j]),
- "set channel", j, "env_vol to undefined, but note is playing");
- continue;
- }
- ch.volE = ch.env_vol.Tick(ch.release);
- ch.panE = ch.env_pan.Tick(ch.release);
- updateChannelPeriod(ch, ch.period + ch.periodoffset);
- }
-}
-
-// This function gradually brings the channel back down to zero if it isn't
-// already to avoid clicks and pops when samples end.
-function MixSilenceIntoBuf(ch, start, end, dataL, dataR) {
- var s = ch.filterstate[1];
- if (isNaN(s)) {
- console.log("NaN filterstate?", ch.filterstate, ch.filter);
- return;
- }
- for (var i = start; i < end; i++) {
- if (Math.abs(s) < 1.526e-5) { // == 1/65536.0
- s = 0;
- break;
- }
- dataL[i] += s * ch.vL;
- dataR[i] += s * ch.vR;
- s *= popfilter_alpha;
- }
- ch.filterstate[1] = s;
- ch.filterstate[2] = s;
- if (isNaN(s)) {
- console.log("NaN filterstate after adding silence?", ch.filterstate, ch.filter, i);
- return;
- }
- return 0;
-}
-
-function MixChannelIntoBuf(ch, start, end, dataL, dataR) {
- var inst = ch.inst;
- var instsamp = ch.samp;
- var loop = false;
- var looplen = 0, loopstart = 0;
-
- // nothing on this channel, just filter the last dc offset back down to zero
- if (instsamp == undefined || inst == undefined || ch.mute) {
- return MixSilenceIntoBuf(ch, start, end, dataL, dataR);
- }
-
- var samp = instsamp.sampledata;
- var sample_end = instsamp.len;
- if ((instsamp.type & 3) == 1 && instsamp.looplen > 0) {
- loop = true;
- loopstart = instsamp.loop;
- looplen = instsamp.looplen;
- sample_end = loopstart + looplen;
- }
- var samplen = instsamp.len;
- var volE = ch.volE / 64.0; // current volume envelope
- var panE = 4*(ch.panE - 32); // current panning envelope
- var p = panE + ch.pan - 128; // final pan
- var volL = player.xm.global_volume * volE * (128 - p) * ch.vol / (64 * 128 * 128);
- var volR = player.xm.global_volume * volE * (128 + p) * ch.vol / (64 * 128 * 128);
- if (volL < 0) volL = 0;
- if (volR < 0) volR = 0;
- if (volR === 0 && volL === 0)
- return;
- if (isNaN(volR) || isNaN(volL)) {
- console.log("NaN volume!?", ch.number, volL, volR, volE, panE, ch.vol);
- return;
- }
- var k = ch.off;
- var dk = ch.doff;
- var Vrms = 0;
- var f0 = ch.filter[0], f1 = ch.filter[1], f2 = ch.filter[2];
- var fs0 = ch.filterstate[0], fs1 = ch.filterstate[1], fs2 = ch.filterstate[2];
-
- // we also low-pass filter volume changes with a simple one-zero,
- // one-pole filter to avoid pops and clicks when volume changes.
- var vL = popfilter_alpha * ch.vL + (1 - popfilter_alpha) * (volL + ch.vLprev) * 0.5;
- var vR = popfilter_alpha * ch.vR + (1 - popfilter_alpha) * (volR + ch.vRprev) * 0.5;
- var pf_8 = Math.pow(popfilter_alpha, 8);
- ch.vLprev = volL;
- ch.vRprev = volR;
-
- // we can mix up to this many bytes before running into a sample end/loop
- var i = start;
- var failsafe = 100;
- while (i < end) {
- if (failsafe-- === 0) {
- console.log("failsafe in mixing loop! channel", ch.number, k, sample_end,
- loopstart, looplen, dk);
- break;
- }
- if (k >= sample_end) { // TODO: implement pingpong looping
- if (loop) {
- k = loopstart + (k - loopstart) % looplen;
- } else {
- // kill sample
- ch.inst = undefined;
- // fill rest of buf with filtered dc offset using loop above
- return Vrms + MixSilenceIntoBuf(ch, i, end, dataL, dataR);
- }
- }
- var next_event = Math.max(1, Math.min(end, i + (sample_end - k) / dk));
- // this is the inner loop of the player
-
- // unrolled 8x
- var s, y;
- for (; i + 7 < next_event; i+=8) {
- s = samp[k|0];
- y = f0 * (s + fs0) + f1*fs1 + f2*fs2;
- fs2 = fs1; fs1 = y; fs0 = s;
- k += dk;
- dataL[i] += vL * y;
- dataR[i] += vR * y;
- Vrms += (vL + vR) * y * y;
-
- s = samp[k|0];
- y = f0 * (s + fs0) + f1*fs1 + f2*fs2;
- fs2 = fs1; fs1 = y; fs0 = s;
- k += dk;
- dataL[i+1] += vL * y;
- dataR[i+1] += vR * y;
- Vrms += (vL + vR) * y * y;
-
- s = samp[k|0];
- y = f0 * (s + fs0) + f1*fs1 + f2*fs2;
- fs2 = fs1; fs1 = y; fs0 = s;
- k += dk;
- dataL[i+2] += vL * y;
- dataR[i+2] += vR * y;
- Vrms += (vL + vR) * y * y;
-
- s = samp[k|0];
- y = f0 * (s + fs0) + f1*fs1 + f2*fs2;
- fs2 = fs1; fs1 = y; fs0 = s;
- k += dk;
- dataL[i+3] += vL * y;
- dataR[i+3] += vR * y;
- Vrms += (vL + vR) * y * y;
-
- s = samp[k|0];
- y = f0 * (s + fs0) + f1*fs1 + f2*fs2;
- fs2 = fs1; fs1 = y; fs0 = s;
- k += dk;
- dataL[i+4] += vL * y;
- dataR[i+4] += vR * y;
- Vrms += (vL + vR) * y * y;
-
- s = samp[k|0];
- y = f0 * (s + fs0) + f1*fs1 + f2*fs2;
- fs2 = fs1; fs1 = y; fs0 = s;
- k += dk;
- dataL[i+5] += vL * y;
- dataR[i+5] += vR * y;
- Vrms += (vL + vR) * y * y;
-
- s = samp[k|0];
- y = f0 * (s + fs0) + f1*fs1 + f2*fs2;
- fs2 = fs1; fs1 = y; fs0 = s;
- k += dk;
- dataL[i+6] += vL * y;
- dataR[i+6] += vR * y;
- Vrms += (vL + vR) * y * y;
-
- s = samp[k|0];
- y = f0 * (s + fs0) + f1*fs1 + f2*fs2;
- fs2 = fs1; fs1 = y; fs0 = s;
- k += dk;
- dataL[i+7] += vL * y;
- dataR[i+7] += vR * y;
- Vrms += (vL + vR) * y * y;
-
- vL = pf_8 * vL + (1 - pf_8) * volL;
- vR = pf_8 * vR + (1 - pf_8) * volR;
- }
-
- for (; i < next_event; i++) {
- s = samp[k|0];
- // we low-pass filter here since we are resampling some arbitrary
- // frequency to f_smp; this is an anti-aliasing filter and is
- // implemented as an IIR butterworth filter (usually we'd use an FIR
- // brick wall filter, but this is much simpler computationally and
- // sounds fine)
- y = f0 * (s + fs0) + f1*fs1 + f2*fs2;
- fs2 = fs1; fs1 = y; fs0 = s;
- dataL[i] += vL * y;
- dataR[i] += vR * y;
- Vrms += (vL + vR) * y * y;
- k += dk;
- }
- }
- ch.off = k;
- ch.filterstate[0] = fs0;
- ch.filterstate[1] = fs1;
- ch.filterstate[2] = fs2;
- ch.vL = vL;
- ch.vR = vR;
- return Vrms * 0.5;
-}
-
-function audio_cb(e) {
- f_smp = player.audioctx.sampleRate;
- var time_sound_started;
- var buflen = e.outputBuffer.length;
- var dataL = e.outputBuffer.getChannelData(0);
- var dataR = e.outputBuffer.getChannelData(1);
- var i, j, k;
-
- for (i = 0; i < buflen; i++) {
- dataL[i] = 0;
- dataR[i] = 0;
- }
-
- var offset = 0;
- var ticklen = 0|(f_smp * 2.5 / player.xm.bpm);
- var scopewidth = XMView.scope_width;
-
- while(buflen > 0) {
- if (player.cur_pat == -1 || player.cur_ticksamp >= ticklen) {
- nextTick(f_smp);
- player.cur_ticksamp -= ticklen;
- }
- var tickduration = Math.min(buflen, ticklen - player.cur_ticksamp);
- var VU = new Float32Array(player.xm.nchan);
- var scopes = undefined;
- for (j = 0; j < player.xm.nchan; j++) {
- var scope;
- if (tickduration >= 4*scopewidth) {
- scope = new Float32Array(scopewidth);
- for (k = 0; k < scopewidth; k++) {
- scope[k] = -dataL[offset+k*4] - dataR[offset+k*4];
- }
- }
-
- VU[j] = MixChannelIntoBuf(
- player.xm.channelinfo[j], offset, offset + tickduration, dataL, dataR) /
- tickduration;
-
- if (tickduration >= 4*scopewidth) {
- for (k = 0; k < scopewidth; k++) {
- scope[k] += dataL[offset+k*4] + dataR[offset+k*4];
- }
- if (scopes === undefined) scopes = [];
- scopes.push(scope);
- }
- }
- if (XMView.pushEvent) {
- XMView.pushEvent({
- t: e.playbackTime + (0.0 + offset) / f_smp,
- vu: VU,
- scopes: scopes,
- songpos: player.cur_songpos,
- pat: player.cur_pat,
- row: player.cur_row
- });
- }
- offset += tickduration;
- player.cur_ticksamp += tickduration;
- buflen -= tickduration;
- }
-}
-
-function ConvertSample(array, bits) {
- var len = array.length;
- var acc = 0;
- var samp, b, k;
- if (bits === 0) { // 8 bit sample
- samp = new Float32Array(len);
- for (k = 0; k < len; k++) {
- acc += array[k];
- b = acc&255;
- if (b & 128) b = b-256;
- samp[k] = b / 128.0;
- }
- return samp;
- } else {
- len /= 2;
- samp = new Float32Array(len);
- for (k = 0; k < len; k++) {
- b = array[k*2] + (array[k*2 + 1] << 8);
- if (b & 32768) b = b-65536;
- acc = Math.max(-1, Math.min(1, acc + b / 32768.0));
- samp[k] = acc;
- }
- return samp;
- }
-}
-
-// optimization: unroll short sample loops so we can run our inner mixing loop
-// uninterrupted for as long as possible; this also handles pingpong loops.
-function UnrollSampleLoop(samp) {
- var nloops = ((2048 + samp.looplen - 1) / samp.looplen) | 0;
- var pingpong = samp.type & 2;
- if (pingpong) {
- // make sure we have an even number of loops if we are pingponging
- nloops = (nloops + 1) & (~1);
- }
- var samplesiz = samp.loop + nloops * samp.looplen;
- var data = new Float32Array(samplesiz);
- for (var i = 0; i < samp.loop; i++) {
- data[i] = samp.sampledata[i];
- }
- for (var j = 0; j < nloops; j++) {
- var k;
- if ((j&1) && pingpong) {
- for (k = samp.looplen - 1; k >= 0; k--) {
- data[i++] = samp.sampledata[samp.loop + k];
- }
- } else {
- for (k = 0; k < samp.looplen; k++) {
- data[i++] = samp.sampledata[samp.loop + k];
- }
- }
- }
- console.log("unrolled sample loop; looplen", samp.looplen, "x", nloops, " = ", samplesiz);
- samp.sampledata = data;
- samp.looplen = nloops * samp.looplen;
- samp.type = 1;
-}
-
-function load(arrayBuf) {
- var dv = new DataView(arrayBuf);
- player.xm = {};
-
- player.xm.songname = getstring(dv, 17, 20);
- var hlen = dv.getUint32(0x3c, true) + 0x3c;
- var songlen = dv.getUint16(0x40, true);
- player.xm.song_looppos = dv.getUint16(0x42, true);
- player.xm.nchan = dv.getUint16(0x44, true);
- var npat = dv.getUint16(0x46, true);
- var ninst = dv.getUint16(0x48, true);
- player.xm.flags = dv.getUint16(0x4a, true);
- player.xm.tempo = dv.getUint16(0x4c, true);
- player.xm.bpm = dv.getUint16(0x4e, true);
- player.xm.channelinfo = [];
- player.xm.global_volume = player.max_global_volume;
-
- var i, j, k;
-
- for (i = 0; i < player.xm.nchan; i++) {
- player.xm.channelinfo.push({
- number: i,
- filterstate: new Float32Array(3),
- vol: 0,
- pan: 128,
- period: 1920 - 48*16,
- vL: 0, vR: 0, // left right volume envelope followers (changes per sample)
- vLprev: 0, vRprev: 0,
- mute: 0,
- volE: 0, panE: 0,
- retrig: 0,
- vibratopos: 0,
- vibratodepth: 1,
- vibratospeed: 1,
- vibratotype: 0,
- });
- }
- console.log("header len " + hlen);
-
- console.log("songlen %d, %d channels, %d patterns, %d instruments", songlen, player.xm.nchan, npat, ninst);
- console.log("loop @%d", player.xm.song_looppos);
- console.log("flags=%d tempo %d bpm %d", player.xm.flags, player.xm.tempo, player.xm.bpm);
-
- player.xm.songpats = [];
- for (i = 0; i < songlen; i++) {
- player.xm.songpats.push(dv.getUint8(0x50 + i));
- }
- console.log("song patterns: ", player.xm.songpats);
-
- var idx = hlen;
- player.xm.patterns = [];
- for (i = 0; i < npat; i++) {
- var pattern = [];
- var patheaderlen = dv.getUint32(idx, true);
- var patrows = dv.getUint16(idx + 5, true);
- var patsize = dv.getUint16(idx + 7, true);
- console.log("pattern %d: %d bytes, %d rows", i, patsize, patrows);
- idx += 9;
- for (j = 0; patsize > 0 && j < patrows; j++) {
- row = [];
- for (k = 0; k < player.xm.nchan; k++) {
- var byte0 = dv.getUint8(idx); idx++;
- var note = -1, inst = -1, vol = -1, efftype = 0, effparam = 0;
- if (byte0 & 0x80) {
- if (byte0 & 0x01) {
- note = dv.getUint8(idx) - 1; idx++;
- }
- if (byte0 & 0x02) {
- inst = dv.getUint8(idx); idx++;
- }
- if (byte0 & 0x04) {
- vol = dv.getUint8(idx); idx++;
- }
- if (byte0 & 0x08) {
- efftype = dv.getUint8(idx); idx++;
- }
- if (byte0 & 0x10) {
- effparam = dv.getUint8(idx); idx++;
- }
- } else {
- // byte0 is note from 1..96 or 0 for nothing or 97 for release
- // so we subtract 1 so that C-0 is stored as 0
- note = byte0 - 1;
- inst = dv.getUint8(idx); idx++;
- vol = dv.getUint8(idx); idx++;
- efftype = dv.getUint8(idx); idx++;
- effparam = dv.getUint8(idx); idx++;
- }
- var notedata = [note, inst, vol, efftype, effparam];
- row.push(notedata);
- }
- pattern.push(row);
- }
- player.xm.patterns.push(pattern);
- }
-
- player.xm.instruments = [];
- // now load instruments
- for (i = 0; i < ninst; i++) {
- var hdrsiz = dv.getUint32(idx, true);
- var instname = getstring(dv, idx+0x4, 22);
- var nsamp = dv.getUint16(idx+0x1b, true);
- var inst = {
- 'name': instname,
- 'number': i,
- };
- if (nsamp > 0) {
- var samplemap = new Uint8Array(arrayBuf, idx+33, 96);
-
- var env_nvol = dv.getUint8(idx+225);
- var env_vol_type = dv.getUint8(idx+233);
- var env_vol_sustain = dv.getUint8(idx+227);
- var env_vol_loop_start = dv.getUint8(idx+228);
- var env_vol_loop_end = dv.getUint8(idx+229);
- var env_npan = dv.getUint8(idx+226);
- var env_pan_type = dv.getUint8(idx+234);
- var env_pan_sustain = dv.getUint8(idx+230);
- var env_pan_loop_start = dv.getUint8(idx+231);
- var env_pan_loop_end = dv.getUint8(idx+232);
- var vol_fadeout = dv.getUint16(idx+239, true);
- var env_vol = [];
- for (j = 0; j < env_nvol*2; j++) {
- env_vol.push(dv.getUint16(idx+129+j*2, true));
- }
- var env_pan = [];
- for (j = 0; j < env_npan*2; j++) {
- env_pan.push(dv.getUint16(idx+177+j*2, true));
- }
- // FIXME: ignoring keymaps for now and assuming 1 sample / instrument
- // var keymap = getarray(dv, idx+0x21);
- var samphdrsiz = dv.getUint32(idx+0x1d, true);
- console.log("hdrsiz %d; instrument %s: '%s' %d samples, samphdrsiz %d",
- hdrsiz, (i+1).toString(16), instname, nsamp, samphdrsiz);
- idx += hdrsiz;
- var totalsamples = 0;
- var samps = [];
- for (j = 0; j < nsamp; j++) {
- var samplen = dv.getUint32(idx, true);
- var samploop = dv.getUint32(idx+4, true);
- var samplooplen = dv.getUint32(idx+8, true);
- var sampvol = dv.getUint8(idx+12);
- var sampfinetune = dv.getInt8(idx+13);
- var samptype = dv.getUint8(idx+14);
- var samppan = dv.getUint8(idx+15);
- var sampnote = dv.getInt8(idx+16);
- var sampname = getstring(dv, idx+18, 22);
- var sampleoffset = totalsamples;
- if (samplooplen === 0) {
- samptype &= ~3;
- }
- console.log("sample %d: len %d name '%s' loop %d/%d vol %d offset %s",
- j, samplen, sampname, samploop, samplooplen, sampvol, sampleoffset.toString(16));
- console.log(" type %d note %s(%d) finetune %d pan %d",
- samptype, prettify_note(sampnote + 12*4), sampnote, sampfinetune, samppan);
- console.log(" vol env", env_vol, env_vol_sustain,
- env_vol_loop_start, env_vol_loop_end, "type", env_vol_type,
- "fadeout", vol_fadeout);
- console.log(" pan env", env_pan, env_pan_sustain,
- env_pan_loop_start, env_pan_loop_end, "type", env_pan_type);
- var samp = {
- 'len': samplen, 'loop': samploop,
- 'looplen': samplooplen, 'note': sampnote, 'fine': sampfinetune,
- 'pan': samppan, 'type': samptype, 'vol': sampvol,
- 'fileoffset': sampleoffset
- };
- // length / pointers are all specified in bytes; fixup for 16-bit samples
- samps.push(samp);
- idx += samphdrsiz;
- totalsamples += samplen;
- }
- for (j = 0; j < nsamp; j++) {
- var samp = samps[j];
- samp.sampledata = ConvertSample(
- new Uint8Array(arrayBuf, idx + samp.fileoffset, samp.len), samp.type & 16);
- if (samp.type & 16) {
- samp.len /= 2;
- samp.loop /= 2;
- samp.looplen /= 2;
- }
- // unroll short loops and any pingpong loops
- if ((samp.type & 3) && (samp.looplen < 2048 || (samp.type & 2))) {
- UnrollSampleLoop(samp);
- }
- }
- idx += totalsamples;
- inst.samplemap = samplemap;
- inst.samples = samps;
- if (env_vol_type) {
- // insert an automatic fadeout to 0 at the end of the envelope
- var env_end_tick = env_vol[env_vol.length-2];
- if (!(env_vol_type & 2)) { // if there's no sustain point, create one
- env_vol_sustain = env_vol.length / 2;
- }
- if (vol_fadeout > 0) {
- var fadeout_ticks = 65536.0 / vol_fadeout;
- env_vol.push(env_end_tick + fadeout_ticks);
- env_vol.push(0);
- }
- inst.env_vol = new Envelope(
- env_vol,
- env_vol_type,
- env_vol_sustain,
- env_vol_loop_start,
- env_vol_loop_end);
- } else {
- // no envelope, then just make a default full-volume envelope.
- // i thought this would use fadeout, but apparently it doesn't.
- inst.env_vol = new Envelope([0, 64, 1, 0], 2, 0, 0, 0);
- }
- if (env_pan_type) {
- if (!(env_pan_type & 2)) { // if there's no sustain point, create one
- env_pan_sustain = env_pan.length / 2;
- }
- inst.env_pan = new Envelope(
- env_pan,
- env_pan_type,
- env_pan_sustain,
- env_pan_loop_start,
- env_pan_loop_end);
- } else {
- // create a default empty envelope
- inst.env_pan = new Envelope([0, 32], 0, 0, 0, 0);
- }
- } else {
- idx += hdrsiz;
- console.log("empty instrument", i, hdrsiz, idx);
- }
- player.xm.instruments.push(inst);
- }
-
- console.log("loaded \"" + player.xm.songname + "\"");
- return true;
-}
-
-var jsNode, gainNode;
-function init() {
- if (!player.audioctx) {
- var audioContext = window.AudioContext || window.webkitAudioContext;
- player.audioctx = new audioContext();
- gainNode = player.audioctx.createGain();
- gainNode.gain.value = 0.1; // master volume
- }
- if (player.audioctx.createScriptProcessor === undefined) {
- jsNode = player.audioctx.createJavaScriptNode(16384, 0, 2);
- } else {
- jsNode = player.audioctx.createScriptProcessor(16384, 0, 2);
- }
- jsNode.onaudioprocess = audio_cb;
- gainNode.connect(player.audioctx.destination);
-
- player.effects_t0 = [ // effect functions on tick 0
- eff_t1_0, // 1, arpeggio is processed on all ticks
- eff_t0_1,
- eff_t0_2,
- eff_t0_3,
- eff_t0_4, // 4
- eff_t0_a, // 5, same as A on first tick
- eff_t0_a, // 6, same as A on first tick
- eff_unimplemented_t0, // 7
- eff_t0_8, // 8
- eff_t0_9, // 9
- eff_t0_a, // a
- eff_t0_b, // b
- eff_t0_c, // c
- eff_t0_d, // d
- eff_t0_e, // e
- eff_t0_f, // f
- eff_t0_g, // g
- eff_t0_h, // h
- eff_unimplemented_t0, // i
- eff_unimplemented_t0, // j
- eff_unimplemented_t0, // k
- eff_unimplemented_t0, // l
- eff_unimplemented_t0, // m
- eff_unimplemented_t0, // n
- eff_unimplemented_t0, // o
- eff_unimplemented_t0, // p
- eff_unimplemented_t0, // q
- eff_t0_r, // r
- eff_unimplemented_t0, // s
- eff_unimplemented_t0, // t
- eff_unimplemented_t0, // u
- eff_unimplemented_t0, // v
- eff_unimplemented_t0, // w
- eff_unimplemented_t0, // x
- eff_unimplemented_t0, // y
- eff_unimplemented_t0, // z
- ];
-
- player.effects_t1 = [ // effect functions on tick 1+
- eff_t1_0,
- eff_t1_1,
- eff_t1_2,
- eff_t1_3,
- eff_t1_4,
- eff_t1_5, // 5
- eff_t1_6, // 6
- eff_unimplemented, // 7
- null, // 8
- null, // 9
- eff_t1_a, // a
- null, // b
- null, // c
- null, // d
- eff_t1_e, // e
- null, // f
- null, // g
- eff_t1_h, // h
- eff_unimplemented, // i
- eff_unimplemented, // j
- eff_unimplemented, // k
- eff_unimplemented, // l
- eff_unimplemented, // m
- eff_unimplemented, // n
- eff_unimplemented, // o
- eff_unimplemented, // p
- eff_unimplemented, // q
- eff_t1_r, // r
- eff_unimplemented, // s
- eff_unimplemented, // t
- eff_unimplemented, // u
- eff_unimplemented, // v
- eff_unimplemented, // w
- eff_unimplemented, // x
- eff_unimplemented, // y
- eff_unimplemented // z
- ];
-}
-
-player.playing = false;
-function play() {
- if (!player.playing) {
- // put paused events back into action, if any
- if (XMView.resume) XMView.resume();
- // start playing
- jsNode.connect(gainNode);
-
- // hack to get iOS to play anything
- var temp_osc = player.audioctx.createOscillator();
- temp_osc.connect(player.audioctx.destination);
- !!temp_osc.start ? temp_osc.start(0) : temp_osc.noteOn(0);
- !!temp_osc.stop ? temp_osc.stop(0) : temp_osc.noteOff(0);
- temp_osc.disconnect();
- }
- player.playing = true;
-}
-
-function pause() {
- if (player.playing) {
- jsNode.disconnect(gainNode);
- if (XMView.pause) XMView.pause();
- }
- player.playing = false;
-}
-
-function stop() {
- if (player.playing) {
- jsNode.disconnect(gainNode);
- player.playing = false;
- }
- player.cur_pat = -1;
- player.cur_row = 64;
- player.cur_songpos = -1;
- player.cur_ticksamp = 0;
- player.xm.global_volume = player.max_global_volume;
- if (XMView.stop) XMView.stop();
- init();
-}
-
-function eff_t1_0(ch) { // arpeggio
- if (ch.effectdata !== 0 && ch.inst !== undefined) {
- var arpeggio = [0, ch.effectdata>>4, ch.effectdata&15];
- var note = ch.note + arpeggio[player.cur_tick % 3];
- ch.period = player.periodForNote(ch, note);
- }
-}
-
-function eff_t0_1(ch, data) { // pitch slide up
- if (data !== 0) {
- ch.slideupspeed = data;
- }
-}
-
-function eff_t1_1(ch) { // pitch slide up
- if (ch.slideupspeed !== undefined) {
- // is this limited? it appears not
- ch.period -= ch.slideupspeed;
- }
-}
-
-function eff_t0_2(ch, data) { // pitch slide down
- if (data !== 0) {
- ch.slidedownspeed = data;
- }
-}
-
-function eff_t1_2(ch) { // pitch slide down
- if (ch.slidedownspeed !== undefined) {
- // 1728 is the period for C-1
- ch.period = Math.min(1728, ch.period + ch.slidedownspeed);
- }
-}
-
-function eff_t0_3(ch, data) { // portamento
- if (data !== 0) {
- ch.portaspeed = data;
- }
-}
-
-function eff_t1_3(ch) { // portamento
- if (ch.periodtarget !== undefined && ch.portaspeed !== undefined) {
- if (ch.period > ch.periodtarget) {
- ch.period = Math.max(ch.periodtarget, ch.period - ch.portaspeed);
- } else {
- ch.period = Math.min(ch.periodtarget, ch.period + ch.portaspeed);
- }
- }
-}
-
-function eff_t0_4(ch, data) { // vibrato
- if (data & 0x0f) {
- ch.vibratodepth = (data & 0x0f) * 2;
- }
- if (data >> 4) {
- ch.vibratospeed = data >> 4;
- }
- eff_t1_4(ch);
-}
-
-function eff_t1_4(ch) { // vibrato
- ch.periodoffset = getVibratoDelta(ch.vibratotype, ch.vibratopos) * ch.vibratodepth;
- if (isNaN(ch.periodoffset)) {
- console.log("vibrato periodoffset NaN?",
- ch.vibratopos, ch.vibratospeed, ch.vibratodepth);
- ch.periodoffset = 0;
- }
- // only updates on non-first ticks
- if (player.cur_tick > 0) {
- ch.vibratopos += ch.vibratospeed;
- ch.vibratopos &= 63;
- }
-}
-
-function getVibratoDelta(type, x) {
- var delta = 0;
- switch (type & 0x03) {
- case 1: // sawtooth (ramp-down)
- delta = ((1 + x * 2 / 64) % 2) - 1;
- break;
- case 2: // square
- case 3: // random (in FT2 these two are the same)
- delta = x < 32 ? 1 : -1;
- break;
- case 0:
- default: // sine
- delta = Math.sin(x * Math.PI / 32);
- break;
- }
- return delta;
-}
-
-function eff_t1_5(ch) { // portamento + volume slide
- eff_t1_a(ch);
- eff_t1_3(ch);
-}
-
-function eff_t1_6(ch) { // vibrato + volume slide
- eff_t1_a(ch);
- eff_t1_4(ch);
-}
-
-function eff_t0_8(ch, data) { // set panning
- ch.pan = data;
-}
-
-function eff_t0_9(ch, data) { // sample offset
- ch.off = data * 256;
-}
-
-function eff_t0_a(ch, data) { // volume slide
- if (data) {
- ch.volumeslide = -(data & 0x0f) + (data >> 4);
- }
-}
-
-function eff_t1_a(ch) { // volume slide
- if (ch.volumeslide !== undefined) {
- ch.vol = Math.max(0, Math.min(64, ch.vol + ch.volumeslide));
- }
-}
-
-function eff_t0_b(ch, data) { // song jump
- if (data < player.xm.songpats.length) {
- player.cur_songpos = data - 1;
- player.cur_pat = -1;
- player.cur_row = -1;
- }
-}
-
-function eff_t0_c(ch, data) { // set volume
- ch.vol = Math.min(64, data);
-}
-
-function eff_t0_d(ch, data) { // pattern jump
- player.cur_songpos++;
- if (player.cur_songpos >= player.xm.songpats.length)
- player.cur_songpos = player.xm.song_looppos;
- player.cur_pat = player.xm.songpats[player.cur_songpos];
- player.next_row = (data >> 4) * 10 + (data & 0x0f);
-}
-
-function eff_t0_e(ch, data) { // extended effects!
- var eff = data >> 4;
- data = data & 0x0f;
- switch (eff) {
- case 1: // fine porta up
- ch.period -= data;
- break;
- case 2: // fine porta down
- ch.period += data;
- break;
- case 4: // set vibrato waveform
- ch.vibratotype = data & 0x07;
- break;
- case 5: // finetune
- ch.fine = (data<<4) + data - 128;
- break;
- case 6: // pattern loop
- if (data == 0) {
- ch.loopstart = player.cur_row
- } else {
- if (typeof ch.loopend === "undefined") {
- ch.loopend = player.cur_row
- ch.loopremaining = data
- }
- if(ch.loopremaining !== 0) {
- ch.loopremaining--
- player.next_row = ch.loopstart || 0
- } else {
- delete ch.loopend
- delete ch.loopstart
- }
- }
- break;
- case 8: // panning
- ch.pan = data * 0x11;
- break;
- case 0x0a: // fine vol slide up (with memory)
- if (data === 0 && ch.finevolup !== undefined)
- data = ch.finevolup;
- ch.vol = Math.min(64, ch.vol + data);
- ch.finevolup = data;
- break;
- case 0x0b: // fine vol slide down
- if (data === 0 && ch.finevoldown !== undefined)
- data = ch.finevoldown;
- ch.vol = Math.max(0, ch.vol - data);
- ch.finevoldown = data;
- break;
- case 0x0c: // note cut handled in eff_t1_e
- break;
- default:
- console.log("unimplemented extended effect E", ch.effectdata.toString(16));
- break;
- }
-}
-
-function eff_t1_e(ch) { // note cut
- switch (ch.effectdata >> 4) {
- case 0x0c:
- if (player.cur_tick == (ch.effectdata & 0x0f)) {
- ch.vol = 0;
- }
- break;
- }
-}
-
-function eff_t0_f(ch, data) { // set tempo
- if (data === 0) {
- console.log("tempo 0?");
- return;
- } else if (data < 0x20) {
- player.xm.tempo = data;
- } else {
- player.xm.bpm = data;
- }
-}
-
-function eff_t0_g(ch, data) { // set global volume
- if (data <= 0x40) {
- // volume gets multiplied by 2 to match
- // the initial max global volume of 128
- player.xm.global_volume = Math.max(0, data * 2);
- } else {
- player.xm.global_volume = player.max_global_volume;
- }
-}
-
-function eff_t0_h(ch, data) { // global volume slide
- if (data) {
- // same as Axy but multiplied by 2
- player.xm.global_volumeslide = (-(data & 0x0f) + (data >> 4)) * 2;
- }
-}
-
-function eff_t1_h(ch) { // global volume slide
- if (player.xm.global_volumeslide !== undefined) {
- player.xm.global_volume = Math.max(0, Math.min(player.max_global_volume,
- player.xm.global_volume + player.xm.global_volumeslide));
- }
-}
-
-function eff_t0_r(ch, data) { // retrigger
- if (data & 0x0f) ch.retrig = (ch.retrig & 0xf0) + (data & 0x0f);
- if (data & 0xf0) ch.retrig = (ch.retrig & 0x0f) + (data & 0xf0);
-
- // retrigger volume table
- switch (ch.retrig >> 4) {
- case 1: ch.vol -= 1; break;
- case 2: ch.vol -= 2; break;
- case 3: ch.vol -= 4; break;
- case 4: ch.vol -= 8; break;
- case 5: ch.vol -= 16; break;
- case 6: ch.vol *= 2; ch.vol /= 3; break;
- case 7: ch.vol /= 2; break;
- case 9: ch.vol += 1; break;
- case 0x0a: ch.vol += 2; break;
- case 0x0b: ch.vol += 4; break;
- case 0x0c: ch.vol += 8; break;
- case 0x0d: ch.vol += 16; break;
- case 0x0e: ch.vol *= 3; ch.vol /= 2; break;
- case 0x0f: ch.vol *= 2; break;
- }
- ch.vol = Math.min(64, Math.max(0, ch.vol));
-}
-
-function eff_t1_r(ch) {
- if (player.cur_tick % (ch.retrig & 0x0f) === 0) {
- ch.off = 0;
- }
-}
-
-function eff_unimplemented() {}
-function eff_unimplemented_t0(ch, data) {
- console.log("unimplemented effect", player.prettify_effect(ch.effect, data));
-}
-
-})(window);