scratchfoundation/scratch-audio
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audio engine manages play note and beat timing

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Eric Rosenbaum 2017-01-30 11:13:34 -05:00
parent e1d478244d
commit 8557c4a7ab
1 changed files with 21 additions and 23 deletions
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44
src/index.js
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@ -38,8 +38,6 @@ function AudioEngine () {
// global tempo in bpm (beats per minute) // global tempo in bpm (beats per minute)
this.currentTempo = 60; this.currentTempo = 60;
this.minTempo = 10;
this.maxTempo = 1000;
// instrument player for play note blocks // instrument player for play note blocks
this.instrumentPlayer = new InstrumentPlayer(this.input); this.instrumentPlayer = new InstrumentPlayer(this.input);
@ -82,8 +80,27 @@ AudioEngine.prototype.loadSounds = function (sounds) {
} }
} }
}; };
AudioEngine.prototype.playNoteForBeatsWithInst = function (note, beats, inst) {
var sec = this.beatsToSec(beats);
this.instrumentPlayer.playNoteForSecWithInst(note, sec, inst);
return this.waitForBeats(beats);
};
AudioEngine.prototype.beatsToSec = function (beats) {
return (60 / this.currentTempo) * beats;
};
AudioEngine.prototype.waitForBeats = function (beats) {
var storedContext = this;
return new Promise(function (resolve) {
setTimeout(function () {
resolve();
}, storedContext.beatsToSec(beats) * 1000);
});
};
AudioEngine.prototype.setTempo = function (value) { AudioEngine.prototype.setTempo = function (value) {
// var newTempo = this._clamp(value, this.minTempo, this.maxTempo);
this.currentTempo = value; this.currentTempo = value;
}; };
@ -153,28 +170,9 @@ AudioPlayer.prototype.playSound = function (md5) {
}); });
}; };
AudioPlayer.prototype.playNoteForBeats = function (note, beats) {
var sec = this.beatsToSec(beats);
this.audioEngine.instrumentPlayer.playNoteForSecWithInst(note, sec, this.currentInstrument);
return this.waitForBeats(beats);
};
AudioPlayer.prototype.playDrumForBeats = function (drum, beats) { AudioPlayer.prototype.playDrumForBeats = function (drum, beats) {
this.audioEngine.drumPlayer.play(drum, this.effectsNode); this.audioEngine.drumPlayer.play(drum, this.effectsNode);
return this.waitForBeats(beats); return this.audioEngine.waitForBeats(beats);
};
AudioPlayer.prototype.waitForBeats = function (beats) {
var storedContext = this;
return new Promise(function (resolve) {
setTimeout(function () {
resolve();
}, storedContext.beatsToSec(beats) * 1000);
});
};
AudioPlayer.prototype.beatsToSec = function (beats) {
return (60 / this.audioEngine.currentTempo) * beats;
}; };
AudioPlayer.prototype.stopAllSounds = function () { AudioPlayer.prototype.stopAllSounds = function () {