index.js
/*
amiga protracker module player for web audio api
(c) 2012-2014 firehawk/tda (firehawk@haxor.fi)
originally hacked together in a weekend, so please excuse
me for the spaghetti code. :)
feel free to use this player in your website/demo/whatever
if you find it useful. drop me an email if you do.
AMIGAAAAAAAAH!!
all code licensed under MIT license:
http://opensource.org/licenses/MIT
kinda sorta changelog:
(sep 2014)
- fixed bug with E8x sync and added 80x to also function for sync
events due to problems with some protracker versions (thanks spot)
(aug 2014)
- added sync event queue for E8x commands
- changed the amiga fixed filter model to allow changes at runtime
- three stereo separation modes now, 0=amiga, 1=65/35, 2=mono
- a few bugfixes, thanks spot^uprough and esau^traktor for reporting
* fixed bug in slide-to-note when 300 with no preceeding 3xy
* fixed vibrato depth on ticks 1+ to match tick 0
* added boolean variable for disabling A500 fixed lowpass filter
* added a delay on module start, number of buffers selectable
* fixed sample loop discarding pointer overflow
(may 2014)
- added boolean variable for the amiga led filter for ui stuff
(jan 2014)
- disabled ee0 filter command for tracks with over 4 channels to
make mod.dope play correctly
(oct 2013)
- added support for firefox 24
(apr 2013)
- changed the logic for pattern break/jump. mod.pattern_skank now
plays correctly.
(feb 2013)
- fixed NaN samples with mod.fractured and mod.multicolour (thanks Aegis!)
(jan 2013)
- fixed vibrato amplitude (was half of what it should be, apparently)
- fixed to work on safari again (thanks Matt Diamond @ stackoverflow.com)
(dec 2012)
- replaced effect switch-statement with jumptables
- fixed clicks (bad loops, empty samples)
- fixed playback bug with sample-only rows
- added amiga 500 lowpass filters (not 100% authentic, though)
- added compressor to output
- latest safari has broken web audio so chrome-only for now
(aug 2012)
- first version written from scratch
todo:
- pattern looping is way broken in mod.black_queen
- properly test EEx delay pattern
- implement the rest of the effects
- optimize for more speed!! SPEEEED!!
* switch to fixed point sample pointers, Math.floor() is _slow_ on iOS
*/
// constructor for protracker player object
function Protracker()
{
var i, t;
this.initialize();
this.clearsong();
this.url="";
this.loading=false;
this.ready=false;
this.playing=false;
this.buffer=0;
this.mixerNode=0;
this.paused=false;
this.repeat=false;
this.filter=false;
this.separation=1;
this.palclock=true;
this.amiga500=true;
this.autostart=false;
this.bufferstodelay=4; // adjust this if you get stutter after loading new song
this.delayfirst=0;
this.delayload=0;
this.syncqueue=[];
this.onReady=function(){};
this.onPlay=function(){};
this.onStop=function(){};
this.context = null;
this.samplerate=44100;
this.bufferlen=2048;
// paula period values
this.baseperiodtable=new Array(
856,808,762,720,678,640,604,570,538,508,480,453,
428,404,381,360,339,320,302,285,269,254,240,226,
214,202,190,180,170,160,151,143,135,127,120,113);
// finetune multipliers
this.finetunetable = [];
for(t=0;t<16;t++) this.finetunetable[t]=Math.pow(2, (t-8)/12/8);
// calc tables for vibrato waveforms
this.vibratotable = [];
for(t=0;t<4;t++) {
this.vibratotable[t] = [];
for(i=0;i<64;i++) {
switch(t) {
case 0:
this.vibratotable[t][i]=127*Math.sin(Math.PI*2*(i/64));
break;
case 1:
this.vibratotable[t][i]=127-4*i;
break;
case 2:
this.vibratotable[t][i]=(i<32)?127:-127;
break;
case 3:
this.vibratotable[t][i]=(1-2*Math.random())*127;
break;
}
}
}
// effect jumptables
this.effects_t0 = new Array(
this.effect_t0_0, this.effect_t0_1, this.effect_t0_2, this.effect_t0_3, this.effect_t0_4, this.effect_t0_5, this.effect_t0_6, this.effect_t0_7,
this.effect_t0_8, this.effect_t0_9, this.effect_t0_a, this.effect_t0_b, this.effect_t0_c, this.effect_t0_d, this.effect_t0_e, this.effect_t0_f);
this.effects_t0_e = new Array(
this.effect_t0_e0, this.effect_t0_e1, this.effect_t0_e2, this.effect_t0_e3, this.effect_t0_e4, this.effect_t0_e5, this.effect_t0_e6, this.effect_t0_e7,
this.effect_t0_e8, this.effect_t0_e9, this.effect_t0_ea, this.effect_t0_eb, this.effect_t0_ec, this.effect_t0_ed, this.effect_t0_ee, this.effect_t0_ef);
this.effects_t1 = new Array(
this.effect_t1_0, this.effect_t1_1, this.effect_t1_2, this.effect_t1_3, this.effect_t1_4, this.effect_t1_5, this.effect_t1_6, this.effect_t1_7,
this.effect_t1_8, this.effect_t1_9, this.effect_t1_a, this.effect_t1_b, this.effect_t1_c, this.effect_t1_d, this.effect_t1_e, this.effect_t1_f);
this.effects_t1_e = new Array(
this.effect_t1_e0, this.effect_t1_e1, this.effect_t1_e2, this.effect_t1_e3, this.effect_t1_e4, this.effect_t1_e5, this.effect_t1_e6, this.effect_t1_e7,
this.effect_t1_e8, this.effect_t1_e9, this.effect_t1_ea, this.effect_t1_eb, this.effect_t1_ec, this.effect_t1_ed, this.effect_t1_ee, this.effect_t1_ef);
}
// create the web audio context
Protracker.prototype.createContext = function()
{
if ( typeof AudioContext !== 'undefined') {
this.context = new AudioContext();
} else {
this.context = new webkitAudioContext();
}
this.samplerate=this.context.sampleRate;
this.bufferlen=(this.samplerate > 44100) ? 4096 : 2048;
// Amiga 500 fixed filter at 6kHz. WebAudio lowpass is 12dB/oct, whereas
// older Amigas had a 6dB/oct filter at 4900Hz.
this.filterNode=this.context.createBiquadFilter();
if (this.amiga500) {
this.filterNode.frequency.value=6000;
} else {
this.filterNode.frequency.value=28867;
}
// "LED filter" at 3275kHz - off by default
this.lowpassNode=this.context.createBiquadFilter();
this.lowpassNode.frequency.value=28867;
this.filter=false;
// mixer
if ( typeof this.context.createJavaScriptNode === 'function') {
this.mixerNode=this.context.createJavaScriptNode(this.bufferlen, 1, 2);
} else {
this.mixerNode=this.context.createScriptProcessor(this.bufferlen, 1, 2);
}
this.mixerNode.module=this;
this.mixerNode.onaudioprocess=Protracker.prototype.mix;
// compressor for a bit of volume boost, helps with multich tunes
this.compressorNode=this.context.createDynamicsCompressor();
// patch up some cables :)
this.mixerNode.connect(this.filterNode);
this.filterNode.connect(this.lowpassNode);
this.lowpassNode.connect(this.compressorNode);
this.compressorNode.connect(this.context.destination);
};
// play loaded and parsed module with webaudio context
Protracker.prototype.play = function()
{
if (this.context===null) {
this.createContext();
}
if (!this.ready) return false;
if (this.paused) {
this.paused=false;
return true;
}
this.endofsong=false;
this.paused=false;
this.initialize();
this.flags=1+2;
this.playing=true;
this.onPlay();
this.delayfirst=this.bufferstodelay;
return true;
};
// pause playback
Protracker.prototype.pause = function()
{
if (!this.paused) {
this.paused=true;
} else {
this.paused=false;
}
};
// stop playback
Protracker.prototype.stop = function()
{
this.playing=false;
this.onStop();
this.delayload=1;
};
// stop playing but don't call callbacks
Protracker.prototype.stopaudio = function(st)
{
this.playing=st;
};
// jump positions forward/back
Protracker.prototype.jump = function(step)
{
this.tick=0;
this.row=0;
this.position+=step;
this.flags=1+2;
if (this.position<0) this.position=0;
if (this.position >= this.songlen) this.stop();
};
// set whether module repeats after songlen
Protracker.prototype.setrepeat = function(rep)
{
this.repeat=rep;
};
// set stereo separation mode (0=paula, 1=betterpaula (60/40), 2=mono)
Protracker.prototype.setseparation = function(sep)
{
this.separation=sep;
};
// set amiga video standard (false=NTSC, true=PAL)
Protracker.prototype.setamigatype = function(clock)
{
this.palclock=clock;
};
// set autostart to play immediately after loading
Protracker.prototype.setautostart = function(st)
{
this.autostart=st;
};
// set amiga model - changes fixed filter state
Protracker.prototype.setamigamodel = function(amiga)
{
if (amiga=="600" || amiga=="1200" || amiga=="4000") {
this.amiga500=false;
if (this.filterNode) this.filterNode.frequency.value=28867;
} else {
this.amiga500=true;
if (this.filterNode) this.filterNode.frequency.value=6000;
}
};
// are there E8x sync events queued?
Protracker.prototype.hassyncevents = function()
{
return (this.syncqueue.length !== 0);
};
// pop oldest sync event nybble from the FIFO queue
Protracker.prototype.popsyncevent = function()
{
return this.syncqueue.pop();
};
// clear song data
Protracker.prototype.clearsong = function()
{
this.title="";
this.signature="";
this.songlen=1;
this.repeatpos=0;
this.patterntable=new ArrayBuffer(128);
for(var i=0;i<128;i++) this.patterntable[i]=0;
this.channels=4;
this.sample=[];
this.samples=31;
for(i=0;i<31;i++) {
this.sample[i]={};
this.sample[i].name="";
this.sample[i].length=0;
this.sample[i].finetune=0;
this.sample[i].volume=64;
this.sample[i].loopstart=0;
this.sample[i].looplength=0;
this.sample[i].data=0;
}
this.patterns=0;
this.pattern=[];
this.note=[];
this.looprow=0;
this.loopstart=0;
this.loopcount=0;
this.patterndelay=0;
this.patternwait=0;
this.syncqueue=[];
};
// initialize all player variables
Protracker.prototype.initialize = function()
{
this.syncqueue=[];
this.tick=0;
this.position=0;
this.row=0;
this.offset=0;
this.flags=0;
this.speed=6;
this.bpm=125;
this.breakrow=0;
this.patternjump=0;
this.patterndelay=0;
this.patternwait=0;
this.endofsong=false;
this.channel=[];
for(i=0;i<this.channels;i++) {
this.channel[i]={};
this.channel[i].sample=0;
this.channel[i].period=214;
this.channel[i].voiceperiod=214;
this.channel[i].note=24;
this.channel[i].volume=64;
this.channel[i].command=0;
this.channel[i].data=0;
this.channel[i].samplepos=0;
this.channel[i].samplespeed=0;
this.channel[i].flags=0;
this.channel[i].noteon=0;
this.channel[i].slidespeed=0;
this.channel[i].slideto=214;
this.channel[i].slidetospeed=0;
this.channel[i].arpeggio=0;
this.channel[i].semitone=12;
this.channel[i].vibratospeed=0;
this.channel[i].vibratodepth=0;
this.channel[i].vibratopos=0;
this.channel[i].vibratowave=0;
}
this.vu=[];
};
// load module from url into local buffer
Protracker.prototype.load = function(url)
{
this.playing=false; // a precaution
this.url=url;
this.clearsong();
var request = new XMLHttpRequest();
request.open("GET", this.url, true);
request.responseType = "arraybuffer";
this.request = request;
this.loading=true;
var asset = this;
request.onload = function() {
asset.buffer=new Uint8Array(request.response);
asset.parse();
if (asset.autostart) asset.play();
};
request.send();
};
// parse the module from local buffer
Protracker.prototype.parse = function()
{
var i,j,c;
if (!this.buffer){
return false;
}
for(i=0;i<4;i++){
this.signature+=String.fromCharCode(this.buffer[1080+i]);
}
switch (this.signature) {
case "M.K.":
case "M!K!":
case "4CHN":
case "FLT4":
break;
case "6CHN":
this.channels=6;
break;
case "8CHN":
case "FLT8":
this.channels=8;
break;
case "28CH":
this.channels=28;
break;
default:
return false;
}
this.vu=[];
for(i=0;i<this.channels;i++){
this.vu[i]=0.0;
}
i=0;
while(this.buffer[i] && i<20){
this.title=this.title+String.fromCharCode(this.buffer[i++]);
}
for(i=0;i<this.samples;i++) {
var st=20+i*30;
j=0;
while(this.buffer[st+j] && j<22) {
this.sample[i].name+=
((this.buffer[st+j]>0x1f) && (this.buffer[st+j]<0x7f)) ?
(String.fromCharCode(this.buffer[st+j])) :
(" ");
j++;
}
this.sample[i].length=2*(this.buffer[st+22]*256 + this.buffer[st+23]);
this.sample[i].finetune=this.buffer[st+24];
if (this.sample[i].finetune > 7) this.sample[i].finetune=this.sample[i].finetune-16;
this.sample[i].volume=this.buffer[st+25];
this.sample[i].loopstart=2*(this.buffer[st+26]*256 + this.buffer[st+27]);
this.sample[i].looplength=2*(this.buffer[st+28]*256 + this.buffer[st+29]);
if (this.sample[i].looplength==2) this.sample[i].looplength=0;
if (this.sample[i].loopstart>this.sample[i].length) {
this.sample[i].loopstart=0;
this.sample[i].looplength=0;
}
}
this.songlen=this.buffer[950];
if (this.buffer[951] != 127) this.repeatpos=this.buffer[951];
for(i=0;i<128;i++) {
this.patterntable[i]=this.buffer[952+i];
if (this.patterntable[i] > this.patterns) this.patterns=this.patterntable[i];
}
this.patterns+=1;
var patlen=4*64*this.channels;
this.pattern=[];
this.note=[];
for(i=0;i<this.patterns;i++) {
this.pattern[i]=new Uint8Array(patlen);
this.note[i]=new Uint8Array(this.channels*64);
for(j=0;j<patlen;j++) this.pattern[i][j]=this.buffer[1084+i*patlen+j];
for(j=0;j<64;j++) for(c=0;c<this.channels;c++) {
this.note[i][j*this.channels+c]=0;
var n=(this.pattern[i][j*4*this.channels+c*4]&0x0f)<<8 | this.pattern[i][j*4*this.channels+c*4+1];
for(var np=0; np<this.baseperiodtable.length; np++)
if (n==this.baseperiodtable[np]) this.note[i][j*this.channels+c]=np;
}
}
var sst=1084+this.patterns*patlen;
for(i=0;i<this.samples;i++) {
this.sample[i].data=new Float32Array(this.sample[i].length);
for(j=0;j<this.sample[i].length;j++) {
var q=this.buffer[sst+j];
if (q<128) {
q=q/128.0;
} else {
q=((q-128)/128.0)-1.0;
}
this.sample[i].data[j]=q;
}
sst+=this.sample[i].length;
}
if (this.context) {
this.lowpassNode.frequency.value=28867;
this.filter=false;
}
this.ready=true;
this.loading=false;
this.buffer=0;
this.onReady();
return true;
};
// advance player
Protracker.prototype.advance=function(mod) {
var spd=(((mod.samplerate*60)/mod.bpm)/4)/6;
// advance player
if (mod.offset>spd) { mod.tick++; mod.offset=0; mod.flags|=1; }
if (mod.tick>=mod.speed) {
if (mod.patterndelay) { // delay pattern
if (mod.tick < ((mod.patternwait+1)*mod.speed)) {
mod.patternwait++;
} else {
mod.row++; mod.tick=0; mod.flags|=2; mod.patterndelay=0;
}
}
else {
if (mod.flags&(16+32+64)) {
if (mod.flags&64) { // loop pattern?
mod.row=mod.looprow;
mod.flags&=0xa1;
mod.flags|=2;
}
else {
if (mod.flags&16) { // pattern jump/break?
//console.log("break to pattern " + mod.patternjump + " row "+mod.breakrow);
mod.position=mod.patternjump;
mod.row=mod.breakrow;
mod.patternjump=0;
mod.breakrow=0;
mod.flags&=0xe1;
mod.flags|=2;
}
}
mod.tick=0;
} else {
mod.row++; mod.tick=0; mod.flags|=2;
}
}
}
if (mod.row>=64) { mod.position++; mod.row=0; mod.flags|=4; }
if (mod.position>=mod.songlen) {
if (mod.repeat) {
mod.position=0;
} else {
this.endofsong=true;
mod.stop();
}
return;
}
};
// mix an audio buffer with data
Protracker.prototype.mix = function(ape) {
var f;
var p, pp, n, nn;
var mod;
if (ape.srcElement) {
mod=ape.srcElement.module;
} else {
mod=this.module;
}
outp=[];
var bufs=new Array(ape.outputBuffer.getChannelData(0), ape.outputBuffer.getChannelData(1));
var buflen=ape.outputBuffer.length;
for(var s=0;s<buflen;s++)
{
outp[0]=0.0;
outp[1]=0.0;
if (!mod.paused && mod.playing && mod.delayfirst===0)
{
mod.advance(mod);
var och=0;
for(var ch=0;ch<mod.channels;ch++)
{
// calculate playback position
p=mod.patterntable[mod.position];
pp=mod.row*4*mod.channels + ch*4;
if (mod.flags&2) { // new row
mod.channel[ch].command=mod.pattern[p][pp+2]&0x0f;
mod.channel[ch].data=mod.pattern[p][pp+3];
if (!(mod.channel[ch].command==0x0e && (mod.channel[ch].data&0xf0)==0xd0)) {
n=(mod.pattern[p][pp]&0x0f)<<8 | mod.pattern[p][pp+1];
if (n) {
// noteon, except if command=3 (porta to note)
if ((mod.channel[ch].command != 0x03) && (mod.channel[ch].command != 0x05)) {
mod.channel[ch].period=n;
mod.channel[ch].samplepos=0;
if (mod.channel[ch].vibratowave>3) mod.channel[ch].vibratopos=0;
mod.channel[ch].flags|=3; // recalc speed
mod.channel[ch].noteon=1;
}
// in either case, set the slide to note target
mod.channel[ch].slideto=n;
}
nn=mod.pattern[p][pp+0]&0xf0 | mod.pattern[p][pp+2]>>4;
if (nn) {
mod.channel[ch].sample=nn-1;
mod.channel[ch].volume=mod.sample[nn-1].volume;
if (!n && (mod.channel[ch].samplepos > mod.sample[nn-1].length)) mod.channel[ch].samplepos=0;
}
}
}
mod.channel[ch].voiceperiod=mod.channel[ch].period;
// kill empty samples
if (!mod.sample[mod.channel[ch].sample].length) mod.channel[ch].noteon=0;
// effects
if (mod.flags&1) {
if (!mod.tick) {
// process only on tick 0
mod.effects_t0[mod.channel[ch].command](mod, ch);
} else {
mod.effects_t1[mod.channel[ch].command](mod, ch);
}
}
// recalc note number from period
if (mod.channel[ch].flags&2) {
for(var np=0; np<mod.baseperiodtable.length; np++)
if (mod.baseperiodtable[np]>=mod.channel[ch].period) mod.channel[ch].note=np;
mod.channel[ch].semitone=7;
if (mod.channel[ch].period>=120)
mod.channel[ch].semitone=mod.baseperiodtable[mod.channel[ch].note]-mod.baseperiodtable[mod.channel[ch].note+1];
}
// recalc sample speed and apply finetune
if ((mod.channel[ch].flags&1 || mod.flags&2) && mod.channel[ch].voiceperiod)
mod.channel[ch].samplespeed=
(mod.palclock ? 7093789.2 : 7159090.5)/(mod.channel[ch].voiceperiod*2) * mod.finetunetable[mod.sample[mod.channel[ch].sample].finetune+8] / mod.samplerate;
// advance vibrato on each new tick
if (mod.flags&1) {
mod.channel[ch].vibratopos+=mod.channel[ch].vibratospeed;
mod.channel[ch].vibratopos&=0x3f;
}
// mix channel to output
och=och^(ch&1);
f=0.0;
if (mod.channel[ch].noteon) {
if (mod.sample[mod.channel[ch].sample].length > mod.channel[ch].samplepos)
f=(1.0/mod.channels) *
(mod.sample[mod.channel[ch].sample].data[Math.floor(mod.channel[ch].samplepos)]*mod.channel[ch].volume)/64.0;
outp[och]+=f;
mod.channel[ch].samplepos+=mod.channel[ch].samplespeed;
}
if (s===0){
mod.vu[ch]=Math.abs(f);
}
// loop or end samples
if (mod.channel[ch].noteon) {
if (mod.sample[mod.channel[ch].sample].loopstart || mod.sample[mod.channel[ch].sample].looplength) {
if (mod.channel[ch].samplepos >= (mod.sample[mod.channel[ch].sample].loopstart+mod.sample[mod.channel[ch].sample].looplength)) {
mod.channel[ch].samplepos-=mod.sample[mod.channel[ch].sample].looplength;
}
} else {
if (mod.channel[ch].samplepos >= mod.sample[mod.channel[ch].sample].length) {
mod.channel[ch].noteon=0;
}
}
}
// clear channel flags
mod.channel[ch].flags=0;
}
mod.offset++;
mod.flags&=0x70;
}
// a more headphone-friendly stereo separation (aka. betterpaula)
if (mod.separation) {
t=outp[0];
if (mod.separation==2) {
outp[0]=outp[0]*0.5 + outp[1]*0.5;
outp[1]=outp[1]*0.5 + t*0.5;
} else {
outp[0]=outp[0]*0.65 + outp[1]*0.35;
outp[1]=outp[1]*0.65 + t*0.35;
}
}
bufs[0][s]=outp[0];
bufs[1][s]=outp[1];
}
if (mod.delayfirst>0) mod.delayfirst--; //=false;
mod.delayload=0;
};
//
// tick 0 effect functions
//
Protracker.prototype.effect_t0_0=function(mod, ch) { // 0 arpeggio
mod.channel[ch].arpeggio=mod.channel[ch].data;
};
Protracker.prototype.effect_t0_1=function(mod, ch) { // 1 slide up
if (mod.channel[ch].data) mod.channel[ch].slidespeed=mod.channel[ch].data;
};
Protracker.prototype.effect_t0_2=function(mod, ch) { // 2 slide down
if (mod.channel[ch].data) mod.channel[ch].slidespeed=mod.channel[ch].data;
};
Protracker.prototype.effect_t0_3=function(mod, ch) { // 3 slide to note
if (mod.channel[ch].data) mod.channel[ch].slidetospeed=mod.channel[ch].data;
};
Protracker.prototype.effect_t0_4=function(mod, ch) { // 4 vibrato
if (mod.channel[ch].data&0x0f && mod.channel[ch].data&0xf0) {
mod.channel[ch].vibratodepth=(mod.channel[ch].data&0x0f);
mod.channel[ch].vibratospeed=(mod.channel[ch].data&0xf0)>>4;
}
mod.channel[ch].voiceperiod+=
(mod.channel[ch].vibratodepth/32)*mod.channel[ch].semitone*(mod.vibratotable[mod.channel[ch].vibratowave&3][mod.channel[ch].vibratopos]/127);
mod.channel[ch].flags|=1;
};
Protracker.prototype.effect_t0_5=function(mod, ch) { // 5
};
Protracker.prototype.effect_t0_6=function(mod, ch) { // 6
};
Protracker.prototype.effect_t0_7=function(mod, ch) { // 7
};
Protracker.prototype.effect_t0_8=function(mod, ch) { // 8 unused, used for syncing
mod.syncqueue.unshift(mod.channel[ch].data&0x0f);
};
Protracker.prototype.effect_t0_9=function(mod, ch) { // 9 set sample offset
mod.channel[ch].samplepos=mod.channel[ch].data*256;
};
Protracker.prototype.effect_t0_a=function(mod, ch) { // a
};
Protracker.prototype.effect_t0_b=function(mod, ch) { // b pattern jump
mod.breakrow=0;
mod.patternjump=mod.channel[ch].data;
mod.flags|=16;
};
Protracker.prototype.effect_t0_c=function(mod, ch) { // c set volume
mod.channel[ch].volume=mod.channel[ch].data;
};
Protracker.prototype.effect_t0_d=function(mod, ch) { // d pattern break
mod.breakrow=((mod.channel[ch].data&0xf0)>>4)*10 + (mod.channel[ch].data&0x0f);
if (!(mod.flags&16)) mod.patternjump=mod.position+1;
mod.flags|=16;
};
Protracker.prototype.effect_t0_e=function(mod, ch) { // e
var i=(mod.channel[ch].data&0xf0)>>4;
mod.effects_t0_e[i](mod, ch);
};
Protracker.prototype.effect_t0_f=function(mod, ch) { // f set speed
if (mod.channel[ch].data > 32) {
mod.bpm=mod.channel[ch].data;
} else {
if (mod.channel[ch].data) mod.speed=mod.channel[ch].data;
}
};
//
// tick 0 effect e functions
//
Protracker.prototype.effect_t0_e0=function(mod, ch) { // e0 filter on/off
if (mod.channels > 4) return; // use only for 4ch amiga tunes
if (mod.channel[ch].data&0x0f) {
mod.lowpassNode.frequency.value=3275;
mod.filter=true;
} else {
mod.lowpassNode.frequency.value=28867;
mod.filter=false;
}
};
Protracker.prototype.effect_t0_e1=function(mod, ch) { // e1 fine slide up
mod.channel[ch].period-=mod.channel[ch].data&0x0f;
if (mod.channel[ch].period < 113) mod.channel[ch].period=113;
};
Protracker.prototype.effect_t0_e2=function(mod, ch) { // e2 fine slide down
mod.channel[ch].period+=mod.channel[ch].data&0x0f;
if (mod.channel[ch].period > 856) mod.channel[ch].period=856;
mod.channel[ch].flags|=1;
};
Protracker.prototype.effect_t0_e3=function(mod, ch) { // e3 set glissando
};
Protracker.prototype.effect_t0_e4=function(mod, ch) { // e4 set vibrato waveform
mod.channel[ch].vibratowave=mod.channel[ch].data&0x07;
};
Protracker.prototype.effect_t0_e5=function(mod, ch) { // e5 set finetune
};
Protracker.prototype.effect_t0_e6=function(mod, ch) { // e6 loop pattern
if (mod.channel[ch].data&0x0f) {
if (mod.loopcount) {
mod.loopcount--;
} else {
mod.loopcount=mod.channel[ch].data&0x0f;
}
if (mod.loopcount) mod.flags|=64;
} else {
mod.looprow=mod.row;
}
};
Protracker.prototype.effect_t0_e7=function(mod, ch) { // e7
};
Protracker.prototype.effect_t0_e8=function(mod, ch) { // e8, use for syncing
mod.syncqueue.unshift(mod.channel[ch].data&0x0f);
};
Protracker.prototype.effect_t0_e9=function(mod, ch) { // e9
};
Protracker.prototype.effect_t0_ea=function(mod, ch) { // ea fine volslide up
mod.channel[ch].volume+=mod.channel[ch].data&0x0f;
if (mod.channel[ch].volume > 64) mod.channel[ch].volume=64;
};
Protracker.prototype.effect_t0_eb=function(mod, ch) { // eb fine volslide down
mod.channel[ch].volume-=mod.channel[ch].data&0x0f;
if (mod.channel[ch].volume < 0) mod.channel[ch].volume=0;
};
Protracker.prototype.effect_t0_ec=function(mod, ch) { // ec
};
Protracker.prototype.effect_t0_ed=function(mod, ch) { // ed delay sample
if (mod.tick==(mod.channel[ch].data&0x0f)) {
// start note
var p=mod.patterntable[mod.position];
var pp=mod.row*4*mod.channels + ch*4;
n=(mod.pattern[p][pp]&0x0f)<<8 | mod.pattern[p][pp+1];
if (n) {
mod.channel[ch].period=n;
mod.channel[ch].voiceperiod=mod.channel[ch].period;
mod.channel[ch].samplepos=0;
if (mod.channel[ch].vibratowave>3) mod.channel[ch].vibratopos=0;
mod.channel[ch].flags|=3; // recalc speed
mod.channel[ch].noteon=1;
}
n=mod.pattern[p][pp+0]&0xf0 | mod.pattern[p][pp+2]>>4;
if (n) {
mod.channel[ch].sample=n-1;
mod.channel[ch].volume=mod.sample[n-1].volume;
}
}
};
Protracker.prototype.effect_t0_ee=function(mod, ch) { // ee delay pattern
mod.patterndelay=mod.channel[ch].data&0x0f;
mod.patternwait=0;
};
Protracker.prototype.effect_t0_ef=function(mod, ch) { // ef
};
//
// tick 1+ effect functions
//
Protracker.prototype.effect_t1_0=function(mod, ch) { // 0 arpeggio
if (mod.channel[ch].data) {
var apn=mod.channel[ch].note;
if ((mod.tick%3)==1) apn+=mod.channel[ch].arpeggio>>4;
if ((mod.tick%3)==2) apn+=mod.channel[ch].arpeggio&0x0f;
if (apn>=0 && apn <= mod.baseperiodtable.length)
mod.channel[ch].voiceperiod = mod.baseperiodtable[apn];
mod.channel[ch].flags|=1;
}
};
Protracker.prototype.effect_t1_1=function(mod, ch) { // 1 slide up
mod.channel[ch].period-=mod.channel[ch].slidespeed;
if (mod.channel[ch].period<113) mod.channel[ch].period=113;
mod.channel[ch].flags|=3; // recalc speed
};
Protracker.prototype.effect_t1_2=function(mod, ch) { // 2 slide down
mod.channel[ch].period+=mod.channel[ch].slidespeed;
if (mod.channel[ch].period>856) mod.channel[ch].period=856;
mod.channel[ch].flags|=3; // recalc speed
};
Protracker.prototype.effect_t1_3=function(mod, ch) { // 3 slide to note
if (mod.channel[ch].period < mod.channel[ch].slideto) {
mod.channel[ch].period+=mod.channel[ch].slidetospeed;
if (mod.channel[ch].period > mod.channel[ch].slideto)
mod.channel[ch].period=mod.channel[ch].slideto;
}
if (mod.channel[ch].period > mod.channel[ch].slideto) {
mod.channel[ch].period-=mod.channel[ch].slidetospeed;
if (mod.channel[ch].period<mod.channel[ch].slideto)
mod.channel[ch].period=mod.channel[ch].slideto;
}
mod.channel[ch].flags|=3; // recalc speed
};
Protracker.prototype.effect_t1_4=function(mod, ch) { // 4 vibrato
mod.channel[ch].voiceperiod+=
(mod.channel[ch].vibratodepth/32)*mod.channel[ch].semitone*(mod.vibratotable[mod.channel[ch].vibratowave&3][mod.channel[ch].vibratopos]/127);
mod.channel[ch].flags|=1;
};
Protracker.prototype.effect_t1_5=function(mod, ch) { // 5 volslide + slide to note
mod.effect_t1_3(mod, ch); // slide to note
mod.effect_t1_a(mod, ch); // volslide
};
Protracker.prototype.effect_t1_6=function(mod, ch) { // 6 volslide + vibrato
mod.effect_t1_4(mod, ch); // vibrato
mod.effect_t1_a(mod, ch); // volslide
};
Protracker.prototype.effect_t1_7=function(mod, ch) { // 7
};
Protracker.prototype.effect_t1_8=function(mod, ch) { // 8 unused
};
Protracker.prototype.effect_t1_9=function(mod, ch) { // 9 set sample offset
};
Protracker.prototype.effect_t1_a=function(mod, ch) { // a volume slide
if (!(mod.channel[ch].data&0x0f)) {
// y is zero, slide up
mod.channel[ch].volume+=(mod.channel[ch].data>>4);
if (mod.channel[ch].volume>64) mod.channel[ch].volume=64;
}
if (!(mod.channel[ch].data&0xf0)) {
// x is zero, slide down
mod.channel[ch].volume-=(mod.channel[ch].data&0x0f);
if (mod.channel[ch].volume<0) mod.channel[ch].volume=0;
}
};
Protracker.prototype.effect_t1_b=function(mod, ch) { // b pattern jump
};
Protracker.prototype.effect_t1_c=function(mod, ch) { // c set volume
};
Protracker.prototype.effect_t1_d=function(mod, ch) { // d pattern break
};
Protracker.prototype.effect_t1_e=function(mod, ch) { // e
var i=(mod.channel[ch].data&0xf0)>>4;
mod.effects_t1_e[i](mod, ch);
};
Protracker.prototype.effect_t1_f=function(mod, ch) { // f
};
//
// tick 1+ effect e functions
//
Protracker.prototype.effect_t1_e0=function(mod, ch) { // e0
};
Protracker.prototype.effect_t1_e1=function(mod, ch) { // e1
};
Protracker.prototype.effect_t1_e2=function(mod, ch) { // e2
};
Protracker.prototype.effect_t1_e3=function(mod, ch) { // e3
};
Protracker.prototype.effect_t1_e4=function(mod, ch) { // e4
};
Protracker.prototype.effect_t1_e5=function(mod, ch) { // e5
};
Protracker.prototype.effect_t1_e6=function(mod, ch) { // e6
};
Protracker.prototype.effect_t1_e7=function(mod, ch) { // e7
};
Protracker.prototype.effect_t1_e8=function(mod, ch) { // e8
};
Protracker.prototype.effect_t1_e9=function(mod, ch) { // e9 retrig sample
if (mod.tick%(mod.channel[ch].data&0x0f)===0)
mod.channel[ch].samplepos=0;
};
Protracker.prototype.effect_t1_ea=function(mod, ch) { // ea
};
Protracker.prototype.effect_t1_eb=function(mod, ch) { // eb
};
Protracker.prototype.effect_t1_ec=function(mod, ch) { // ec cut sample
if (mod.tick==(mod.channel[ch].data&0x0f))
mod.channel[ch].volume=0;
};
Protracker.prototype.effect_t1_ed=function(mod, ch) { // ed delay sample
mod.effect_t0_ed(mod, ch);
};
Protracker.prototype.effect_t1_ee=function(mod, ch) { // ee
};
Protracker.prototype.effect_t1_ef=function(mod, ch) { // ef
};
// feel free to disable the formats
require('./formats/it')(Protracker);
require('./formats/mod')(Protracker);
require('./formats/xm')(Protracker);
module.exports = Protracker;