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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| window.AudioContext = window.AudioContext || window.webkitAudioContext; | ||
| // Original JavaScript code by Chirp Internet: www.chirpinternet.eu | ||
| // Please acknowledge use of this code by including this header. | ||
|
|
||
| function SoundPlayer(audioContext, filterNode) { | ||
| this.audioCtx = audioContext; | ||
| this.gainNode = this.audioCtx.createGain(); | ||
|
|
||
| if (filterNode) { | ||
| // run output through extra filter (already connected to audioContext) | ||
| this.gainNode.connect(filterNode); | ||
| } else { | ||
| this.gainNode.connect(this.audioCtx.destination); | ||
| } | ||
|
|
||
| this.oscillator = this.audioCtx.createOscillator(); | ||
| } | ||
|
|
||
| SoundPlayer.prototype.setFrequency = function (val, when) { | ||
| //Frequency in Hz | ||
| if (this.oscillator !== null) { | ||
| if (when) { | ||
| this.oscillator.frequency.setValueAtTime( | ||
| val, | ||
| this.audioCtx.currentTime + when | ||
| ); | ||
| } else { | ||
| this.oscillator.frequency.setValueAtTime(val, this.audioCtx.currentTime); | ||
| } | ||
| } | ||
| return this; | ||
| }; | ||
|
|
||
| SoundPlayer.prototype.setVolume = function (val, when) { | ||
| //Gain? | ||
| //min: -3.4028235e38 | ||
| //max: 3.4028235e38 | ||
| if (when) { | ||
| this.gainNode.gain.exponentialRampToValueAtTime( | ||
| val, | ||
| this.audioCtx.currentTime + when | ||
| ); | ||
| } else { | ||
| this.gainNode.gain.setValueAtTime(val, this.audioCtx.currentTime); | ||
| } | ||
| return this; | ||
| }; | ||
|
|
||
| SoundPlayer.prototype.setWaveType = function (waveType) { | ||
| //sine, square, sawtooth or triangle | ||
| this.oscillator.type = waveType; | ||
| return this; | ||
| }; | ||
|
|
||
| SoundPlayer.prototype.play = function (freq, vol, wave, when) { | ||
| this.oscillator = this.audioCtx.createOscillator(); | ||
| this.oscillator.connect(this.gainNode); | ||
| this.setFrequency(freq); | ||
| if (wave) { | ||
| this.setWaveType(wave); | ||
| } | ||
| this.setVolume(1 / 1000); | ||
|
|
||
| if (when) { | ||
| this.setVolume(1 / 1000, when - 0.02); | ||
| this.oscillator.start(when - 0.02); | ||
| this.setVolume(vol, when); | ||
| } else { | ||
| this.oscillator.start(); | ||
| this.setVolume(vol, 0.02); | ||
| } | ||
|
|
||
| return this; | ||
| }; | ||
|
|
||
| SoundPlayer.prototype.stop = function (when) { | ||
| if (when) { | ||
| this.gainNode.gain.setTargetAtTime( | ||
| 1 / 1000, | ||
| this.audioCtx.currentTime + when - 0.05, | ||
| 0.02 | ||
| ); | ||
| this.oscillator.stop(this.audioCtx.currentTime + when); | ||
| } else { | ||
| this.gainNode.gain.setTargetAtTime( | ||
| 1 / 1000, | ||
| this.audioCtx.currentTime, | ||
| 0.02 | ||
| ); | ||
| this.oscillator.stop(this.audioCtx.currentTime + 0.05); | ||
| } | ||
| return this; | ||
| }; |
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