scratch-html5/js/primitives/SoundPrims.js

213 lines
7.1 KiB
JavaScript

// Copyright (C) 2013 Massachusetts Institute of Technology
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License version 2,
// as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
'use strict';
var SoundPrims = function() {}
SoundPrims.prototype.addPrimsTo = function(primTable) {
primTable['playSound:'] = this.primPlaySound;
primTable['doPlaySoundAndWait'] = this.primPlaySoundUntilDone;
primTable['stopAllSounds'] = this.primStopAllSounds;
primTable['playDrum'] = this.primPlayDrum;
primTable['rest:elapsed:from:'] = this.primPlayRest;
primTable['noteOn:duration:elapsed:from:'] = this.primPlayNote;
primTable['instrument:'] = this.primSetInstrument;
/*primTable['changeVolumeBy:'] = this.primChangeVolume;
primTable['setVolumeTo:'] = this.primSetVolume;
primTable['volume'] = this.primVolume;*/
primTable['changeTempoBy:'] = function(b) { runtime.stage.data.tempoBPM = runtime.stage.data.tempoBPM + interp.arg(b, 0); };
primTable['setTempoTo:'] = function(b) { runtime.stage.data.tempoBPM = interp.arg(b, 0); };
primTable['tempo'] = function(b) { return runtime.stage.data.tempoBPM; };
}
var playSound = function(snd) {
if (snd.source) {
// If this particular sound is already playing, stop it.
snd.source.noteOff(0);
snd.source = null;
}
snd.source = runtime.audioContext.createBufferSource();
snd.source.buffer = snd.buffer;
snd.source.connect(runtime.audioGain);
// Track the sound's completion state
snd.source.done = false;
snd.source.finished = function() {
// Remove from the active audio list and disconnect the source from
// the sound dictionary.
var i = runtime.audioPlaying.indexOf(snd);
if (i > -1 && runtime.audioPlaying[i].source != null) {
runtime.audioPlaying[i].source.done = true;
runtime.audioPlaying[i].source = null;
runtime.audioPlaying.splice(i, 1);
}
}
window.setTimeout(snd.source.finished, snd.buffer.duration * 1000);
// Add the global list of playing sounds and start playing.
runtime.audioPlaying.push(snd);
snd.source.noteOn(0);
return snd.source;
}
var playDrum = function(drum, secs, client) {
var player = SoundBank.getDrumPlayer(drum, secs);
player.client = client;
player.setDuration(secs);
var source = runtime.audioContext.createScriptProcessor(4096, 1, 1);
source.onaudioprocess = function(e) { player.writeSampleData(e); };
source.soundPlayer = player;
source.connect(runtime.audioGain);
runtime.notesPlaying.push(source);
source.finished = function() {
var i = runtime.notesPlaying.indexOf(source);
if (i > -1 && runtime.notesPlaying[i] != null) {
runtime.notesPlaying.splice(i, 1);
}
}
window.setTimeout(source.finished, secs * 1000);
return player;
}
var playNote = function(instrument, midiKey, secs, client) {
var player = SoundBank.getNotePlayer(instrument, midiKey);
player.client = client;
player.setNoteAndDuration(midiKey, secs);
var source = runtime.audioContext.createScriptProcessor(4096, 1, 1);
source.onaudioprocess = function(e) { player.writeSampleData(e); };
source.connect(runtime.audioGain);
runtime.notesPlaying.push(source);
source.finished = function() {
var i = runtime.notesPlaying.indexOf(source);
if (i > -1 && runtime.notesPlaying[i] != null) {
runtime.notesPlaying.splice(i, 1);
}
}
window.setTimeout(source.finished, secs * 1000);
return player;
}
var stopAllSounds = function() {
var oldPlaying = runtime.audioPlaying;
runtime.audioPlaying = [];
for (var s = 0; s < oldPlaying.length; s++) {
if (oldPlaying[s].source) {
oldPlaying[s].source.noteOff(0);
oldPlaying[s].source.finished();
}
}
var oldPlaying = runtime.notesPlaying;
runtime.notesPlaying = [];
for (var s = 0; s < oldPlaying.length; s++) {
if (oldPlaying[s]) {
oldPlaying[s].disconnect();
oldPlaying[s].finished();
}
}
}
SoundPrims.prototype.primPlaySound = function(b) {
var s = interp.targetSprite();
if (s == null) return;
var snd = s.soundNamed(interp.arg(b, 0));
if (snd != null) playSound(snd);
}
SoundPrims.prototype.primPlaySoundUntilDone = function(b) {
var activeThread = interp.activeThread;
if (activeThread.firstTime) {
var snd = interp.targetSprite().soundNamed(interp.arg(b, 0));
if (snd == null) return;
activeThread.tmpObj = playSound(snd);
activeThread.firstTime = false;
}
var player = activeThread.tmpObj;
if (player == null || player.done || player.playbackState == 3) {
activeThread.tmpObj = null;
activeThread.firstTime = true;
} else {
interp.yield = true;
}
}
var beatsToSeconds = function(beats) {
return (beats * 60) / runtime.stage.data.tempoBPM;
}
SoundPrims.prototype.primPlayNote = function(b) {
var s = interp.targetSprite();
if (s == null) return;
if (interp.activeThread.firstTime) {
var key = interp.numarg(b, 0);
var secs = beatsToSeconds(interp.numarg(b, 1));
playNote(s.instrument, key, secs, s);
interp.startTimer(secs);
} else {
interp.checkTimer();
}
}
SoundPrims.prototype.primPlayDrum = function(b) {
var s = interp.targetSprite();
if (s == null) return;
if (interp.activeThread.firstTime) {
var drum = Math.round(interp.numarg(b, 0));
var secs = beatsToSeconds(interp.numarg(b, 1));
playDrum(drum, secs, s);
interp.startTimer(secs);
} else {
interp.checkTimer();
}
}
SoundPrims.prototype.primPlayRest = function(b) {
var s = interp.targetSprite();
if (s == null) return;
if (interp.activeThread.firstTime) {
var secs = beatsToSeconds(interp.numarg(b, 0));
interp.startTimer(secs);
} else {
interp.checkTimer();
}
}
SoundPrims.prototype.primSetInstrument = function(b) {
var s = interp.targetSprite();
if (s != null) s.instrument = interp.arg(b, 0);
}
SoundPrims.prototype.primStopAllSounds = function(b) {
stopAllSounds();
}
SoundPrims.prototype.primChangeVolume = function(b) {
var s = interp.targetSprite();
if (s != null) s.volume += interp.numarg(b, 0);
}
SoundPrims.prototype.primSetVolume = function(b) {
var s = interp.targetSprite();
if (s != null) s.volume = interp.numarg(b, 0);
}
SoundPrims.prototype.primVolume = function(b) {
var s = interp.targetSprite();
return (s != null) ? s.volume : 0;
}