formats/mod.js
module.exports = function(Protracker){
Protracker.prototype.parseMOD = function()
{
var i,j;
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;
}
this.ready=true;
this.loading=false;
this.buffer=0;
if (this.context) this.lowpassNode.frequency.value=28867;
this.onReady();
return true;
};
}