mirror of
https://github.com/scratchfoundation/scratch-html5.git
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213 lines
7.1 KiB
JavaScript
213 lines
7.1 KiB
JavaScript
// Copyright (C) 2013 Massachusetts Institute of Technology
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License version 2,
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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'use strict';
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var SoundPrims = function() {}
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SoundPrims.prototype.addPrimsTo = function(primTable) {
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primTable['playSound:'] = this.primPlaySound;
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primTable['doPlaySoundAndWait'] = this.primPlaySoundUntilDone;
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primTable['stopAllSounds'] = this.primStopAllSounds;
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primTable['playDrum'] = this.primPlayDrum;
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primTable['rest:elapsed:from:'] = this.primPlayRest;
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primTable['noteOn:duration:elapsed:from:'] = this.primPlayNote;
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primTable['instrument:'] = this.primSetInstrument;
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/*primTable['changeVolumeBy:'] = this.primChangeVolume;
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primTable['setVolumeTo:'] = this.primSetVolume;
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primTable['volume'] = this.primVolume;*/
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primTable['changeTempoBy:'] = function(b) { runtime.stage.data.tempoBPM = runtime.stage.data.tempoBPM + interp.arg(b, 0); };
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primTable['setTempoTo:'] = function(b) { runtime.stage.data.tempoBPM = interp.arg(b, 0); };
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primTable['tempo'] = function(b) { return runtime.stage.data.tempoBPM; };
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}
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var playSound = function(snd) {
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if (snd.source) {
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// If this particular sound is already playing, stop it.
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snd.source.noteOff(0);
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snd.source = null;
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}
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snd.source = runtime.audioContext.createBufferSource();
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snd.source.buffer = snd.buffer;
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snd.source.connect(runtime.audioGain);
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// Track the sound's completion state
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snd.source.done = false;
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snd.source.finished = function() {
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// Remove from the active audio list and disconnect the source from
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// the sound dictionary.
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var i = runtime.audioPlaying.indexOf(snd);
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if (i > -1 && runtime.audioPlaying[i].source != null) {
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runtime.audioPlaying[i].source.done = true;
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runtime.audioPlaying[i].source = null;
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runtime.audioPlaying.splice(i, 1);
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}
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}
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window.setTimeout(snd.source.finished, snd.buffer.duration * 1000);
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// Add the global list of playing sounds and start playing.
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runtime.audioPlaying.push(snd);
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snd.source.noteOn(0);
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return snd.source;
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}
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var playDrum = function(drum, secs, client) {
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var player = SoundBank.getDrumPlayer(drum, secs);
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player.client = client;
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player.setDuration(secs);
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var source = runtime.audioContext.createScriptProcessor(4096, 1, 1);
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source.onaudioprocess = function(e) { player.writeSampleData(e); };
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source.soundPlayer = player;
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source.connect(runtime.audioGain);
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runtime.notesPlaying.push(source);
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source.finished = function() {
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var i = runtime.notesPlaying.indexOf(source);
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if (i > -1 && runtime.notesPlaying[i] != null) {
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runtime.notesPlaying.splice(i, 1);
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}
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}
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window.setTimeout(source.finished, secs * 1000);
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return player;
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}
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var playNote = function(instrument, midiKey, secs, client) {
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var player = SoundBank.getNotePlayer(instrument, midiKey);
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player.client = client;
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player.setNoteAndDuration(midiKey, secs);
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var source = runtime.audioContext.createScriptProcessor(4096, 1, 1);
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source.onaudioprocess = function(e) { player.writeSampleData(e); };
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source.connect(runtime.audioGain);
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runtime.notesPlaying.push(source);
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source.finished = function() {
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var i = runtime.notesPlaying.indexOf(source);
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if (i > -1 && runtime.notesPlaying[i] != null) {
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runtime.notesPlaying.splice(i, 1);
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}
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}
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window.setTimeout(source.finished, secs * 1000);
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return player;
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}
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var stopAllSounds = function() {
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var oldPlaying = runtime.audioPlaying;
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runtime.audioPlaying = [];
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for (var s = 0; s < oldPlaying.length; s++) {
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if (oldPlaying[s].source) {
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oldPlaying[s].source.noteOff(0);
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oldPlaying[s].source.finished();
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}
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}
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var oldPlaying = runtime.notesPlaying;
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runtime.notesPlaying = [];
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for (var s = 0; s < oldPlaying.length; s++) {
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if (oldPlaying[s]) {
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oldPlaying[s].disconnect();
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oldPlaying[s].finished();
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}
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}
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}
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SoundPrims.prototype.primPlaySound = function(b) {
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var s = interp.targetSprite();
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if (s == null) return;
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var snd = s.soundNamed(interp.arg(b, 0));
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if (snd != null) playSound(snd);
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}
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SoundPrims.prototype.primPlaySoundUntilDone = function(b) {
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var activeThread = interp.activeThread;
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if (activeThread.firstTime) {
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var snd = interp.targetSprite().soundNamed(interp.arg(b, 0));
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if (snd == null) return;
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activeThread.tmpObj = playSound(snd);
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activeThread.firstTime = false;
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}
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var player = activeThread.tmpObj;
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if (player == null || player.done || player.playbackState == 3) {
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activeThread.tmpObj = null;
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activeThread.firstTime = true;
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} else {
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interp.yield = true;
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}
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}
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var beatsToSeconds = function(beats) {
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return (beats * 60) / runtime.stage.data.tempoBPM;
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}
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SoundPrims.prototype.primPlayNote = function(b) {
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var s = interp.targetSprite();
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if (s == null) return;
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if (interp.activeThread.firstTime) {
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var key = interp.arg(b, 0);
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var secs = beatsToSeconds(interp.arg(b, 1));
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playNote(s.instrument, key, secs, s);
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interp.startTimer(secs);
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} else {
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interp.checkTimer();
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}
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}
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SoundPrims.prototype.primPlayDrum = function(b) {
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var s = interp.targetSprite();
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if (s == null) return;
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if (interp.activeThread.firstTime) {
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var drum = Math.round(interp.arg(b, 0));
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var secs = beatsToSeconds(interp.arg(b, 1));
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playDrum(drum, secs, s);
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interp.startTimer(secs);
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} else {
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interp.checkTimer();
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}
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}
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SoundPrims.prototype.primPlayRest = function(b) {
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var s = interp.targetSprite();
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if (s == null) return;
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if (interp.activeThread.firstTime) {
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var secs = beatsToSeconds(interp.arg(b, 0));
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interp.startTimer(secs);
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} else {
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interp.checkTimer();
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}
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}
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SoundPrims.prototype.primSetInstrument = function(b) {
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var s = interp.targetSprite();
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if (s != null) s.instrument = interp.arg(b, 0);
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}
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SoundPrims.prototype.primStopAllSounds = function(b) {
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stopAllSounds();
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}
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SoundPrims.prototype.primChangeVolume = function(b) {
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var s = interp.targetSprite();
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if (s != null) s.volume += interp.arg(b, 0);
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}
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SoundPrims.prototype.primSetVolume = function(b) {
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var s = interp.targetSprite();
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if (s != null) s.volume = interp.arg(b, 0);
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}
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SoundPrims.prototype.primVolume = function(b) {
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var s = interp.targetSprite();
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return (s != null) ? s.volume : 0;
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}
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