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parser.js
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parser.js
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var song;
var emu8910 = new PSG49(YM_CLOCK_ZX, 50);
var currentSong = 0;
var songs = [
"200km_nik-o.fym",
"01_scalesmannmisfire.fym"
];
loadAndPlay = function() {
emu8910.driver.device.resume()
var oReq = new XMLHttpRequest();
oReq.open('GET', 'music/' + songs[currentSong], true);
oReq.responseType = 'arraybuffer';
oReq.onload = function(e) {
if(oReq.response) play(oReq.response);
}
oReq.send();
}
updateState = function() {
var r = song.getNextFrame();
emu8910.register.A_FINE = r[0]
emu8910.register.A_COARSE = r[1];
emu8910.register.B_FINE = r[2];
emu8910.register.B_COARSE = r[3];
emu8910.register.C_FINE = r[4];
emu8910.register.C_COARSE = r[5];
emu8910.register.NOISE_PERIOD = r[6];
emu8910.register.MIXER = r[7];
emu8910.register.A_VOL = r[8];
emu8910.register.B_VOL = r[9];
emu8910.register.C_VOL = r[10];
emu8910.register.ENV_FINE = r[11];
emu8910.register.ENV_COARSE = r[12];
if (r[13] != 0xff) {
emu8910.register.ENV_SHAPE = r[13];
}
}
play = function(fym) {
song = new FYMReader(fym);
emu8910.interrupt.routine = updateState;
emu8910.clock.frequency = song.getClockRate()
emu8910.interrupt.frequency = song.getFrameRate()
currentSong++
if(currentSong >= songs.length){
currentSong = 0;
}
}
document.addEventListener('click', loadAndPlay, false);
document.addEventListener('touchend', loadAndPlay, false);