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a javascript module to record sound from the microphone, and save it.
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/* Copyright 2013 Chris Wilson | |
Licensed under the Apache License, Version 2.0 (the "License"); | |
you may not use this file except in compliance with the License. | |
You may obtain a copy of the License at | |
http://www.apache.org/licenses/LICENSE-2.0 | |
Unless required by applicable law or agreed to in writing, software | |
distributed under the License is distributed on an "AS IS" BASIS, | |
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
See the License for the specific language governing permissions and | |
limitations under the License. | |
*/ | |
/* | |
This monkeypatch library is intended to be included in projects that are | |
written to the proper AudioContext spec (instead of webkitAudioContext), | |
and that use the new naming and proper bits of the Web Audio API (e.g. | |
using BufferSourceNode.start() instead of BufferSourceNode.noteOn()), but may | |
have to run on systems that only support the deprecated bits. | |
This library should be harmless to include if the browser supports | |
unprefixed "AudioContext", and/or if it supports the new names. | |
The patches this library handles: | |
if window.AudioContext is unsupported, it will be aliased to webkitAudioContext(). | |
if AudioBufferSourceNode.start() is unimplemented, it will be routed to noteOn() or | |
noteGrainOn(), depending on parameters. | |
The following aliases only take effect if the new names are not already in place: | |
AudioBufferSourceNode.stop() is aliased to noteOff() | |
AudioContext.createGain() is aliased to createGainNode() | |
AudioContext.createDelay() is aliased to createDelayNode() | |
AudioContext.createScriptProcessor() is aliased to createJavaScriptNode() | |
OscillatorNode.start() is aliased to noteOn() | |
OscillatorNode.stop() is aliased to noteOff() | |
AudioParam.setTargetAtTime() is aliased to setTargetValueAtTime() | |
This library does NOT patch the enumerated type changes, as it is | |
recommended in the specification that implementations support both integer | |
and string types for AudioPannerNode.panningModel, AudioPannerNode.distanceModel | |
BiquadFilterNode.type and OscillatorNode.type. | |
*/ | |
(function (global, exports, perf) { | |
'use strict'; | |
function fixSetTarget(param) { | |
if (!param) // if NYI, just return | |
return; | |
if (!param.setTargetAtTime) | |
param.setTargetAtTime = param.setTargetValueAtTime; | |
} | |
if (window.hasOwnProperty('webkitAudioContext') && | |
!window.hasOwnProperty('AudioContext')) { | |
window.AudioContext = webkitAudioContext; | |
if (!AudioContext.prototype.hasOwnProperty('createGain')) | |
AudioContext.prototype.createGain = AudioContext.prototype.createGainNode; | |
if (!AudioContext.prototype.hasOwnProperty('createDelay')) | |
AudioContext.prototype.createDelay = AudioContext.prototype.createDelayNode; | |
if (!AudioContext.prototype.hasOwnProperty('createScriptProcessor')) | |
AudioContext.prototype.createScriptProcessor = AudioContext.prototype.createJavaScriptNode; | |
AudioContext.prototype.internal_createGain = AudioContext.prototype.createGain; | |
AudioContext.prototype.createGain = function() { | |
var node = this.internal_createGain(); | |
fixSetTarget(node.gain); | |
return node; | |
}; | |
AudioContext.prototype.internal_createDelay = AudioContext.prototype.createDelay; | |
AudioContext.prototype.createDelay = function(maxDelayTime) { | |
var node = maxDelayTime ? this.internal_createDelay(maxDelayTime) : this.internal_createDelay(); | |
fixSetTarget(node.delayTime); | |
return node; | |
}; | |
AudioContext.prototype.internal_createBufferSource = AudioContext.prototype.createBufferSource; | |
AudioContext.prototype.createBufferSource = function() { | |
var node = this.internal_createBufferSource(); | |
if (!node.start) { | |
node.start = function ( when, offset, duration ) { | |
if ( offset || duration ) | |
this.noteGrainOn( when, offset, duration ); | |
else | |
this.noteOn( when ); | |
} | |
} | |
if (!node.stop) | |
node.stop = node.noteOff; | |
fixSetTarget(node.playbackRate); | |
return node; | |
}; | |
AudioContext.prototype.internal_createDynamicsCompressor = AudioContext.prototype.createDynamicsCompressor; | |
AudioContext.prototype.createDynamicsCompressor = function() { | |
var node = this.internal_createDynamicsCompressor(); | |
fixSetTarget(node.threshold); | |
fixSetTarget(node.knee); | |
fixSetTarget(node.ratio); | |
fixSetTarget(node.reduction); | |
fixSetTarget(node.attack); | |
fixSetTarget(node.release); | |
return node; | |
}; | |
AudioContext.prototype.internal_createBiquadFilter = AudioContext.prototype.createBiquadFilter; | |
AudioContext.prototype.createBiquadFilter = function() { | |
var node = this.internal_createBiquadFilter(); | |
fixSetTarget(node.frequency); | |
fixSetTarget(node.detune); | |
fixSetTarget(node.Q); | |
fixSetTarget(node.gain); | |
return node; | |
}; | |
if (AudioContext.prototype.hasOwnProperty( 'createOscillator' )) { | |
AudioContext.prototype.internal_createOscillator = AudioContext.prototype.createOscillator; | |
AudioContext.prototype.createOscillator = function() { | |
var node = this.internal_createOscillator(); | |
if (!node.start) | |
node.start = node.noteOn; | |
if (!node.stop) | |
node.stop = node.noteOff; | |
fixSetTarget(node.frequency); | |
fixSetTarget(node.detune); | |
return node; | |
}; | |
} | |
} | |
}(window)); |
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<script src="{{STATIC_URL}}js/AudioContextMonkeyPatch.js"></script> | |
<script src="{{STATIC_URL}}js/recorder.js"></script> | |
<script src="{{STATIC_URL}}js/main.js"></script> | |
<style> | |
#record.recording { | |
background: red; | |
background: -webkit-radial-gradient(center, ellipse cover, #ff0000 0%,lightgrey 75%,lightgrey 100%,#7db9e8 100%); | |
} | |
</style> | |
</head> | |
<body> | |
<div id="controls"> | |
<input id="filename" type="text" placeholder="Filename"> | |
<button id="record" onclick="toggleRecording(this);">record</button> | |
<button id="save" onclick="saveAudio(document.getElementById('filename').value);">save</button> | |
</div> | |
</body> | |
</html> |
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/* Copyright 2013 Chris Wilson | |
Licensed under the Apache License, Version 2.0 (the "License"); | |
you may not use this file except in compliance with the License. | |
You may obtain a copy of the License at | |
http://www.apache.org/licenses/LICENSE-2.0 | |
Unless required by applicable law or agreed to in writing, software | |
distributed under the License is distributed on an "AS IS" BASIS, | |
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
See the License for the specific language governing permissions and | |
limitations under the License. | |
*/ | |
window.AudioContext = window.AudioContext || window.webkitAudioContext; | |
var audioContext = new AudioContext(); | |
var audioInput = null, | |
realAudioInput = null, | |
inputPoint = null, | |
audioRecorder = null; | |
var rafID = null; | |
var analyserContext = null; | |
var recIndex = 0; | |
/* TODO: | |
- offer mono option | |
- "Monitor input" switch | |
*/ | |
function saveAudio(file_name) { | |
alert(file_name); | |
filename = file_name; | |
audioRecorder.exportWAV( doneEncoding ); | |
// could get mono instead by saying | |
// audioRecorder.exportMonoWAV( doneEncoding ); | |
} | |
function doneEncoding( blob ) { | |
Recorder.forceDownload( blob, filename + ".wav" ); | |
recIndex++; | |
} | |
function toggleRecording( e ) { | |
if (e.classList.contains("recording")) { | |
// stop recording | |
audioRecorder.stop(); | |
e.classList.remove("recording"); | |
} else { | |
// start recording | |
if (!audioRecorder) | |
return; | |
e.classList.add("recording"); | |
audioRecorder.clear(); | |
audioRecorder.record(); | |
} | |
} | |
function convertToMono( input ) { | |
var splitter = audioContext.createChannelSplitter(2); | |
var merger = audioContext.createChannelMerger(2); | |
input.connect( splitter ); | |
splitter.connect( merger, 0, 0 ); | |
splitter.connect( merger, 0, 1 ); | |
return merger; | |
} | |
function cancelAnalyserUpdates() { | |
window.cancelAnimationFrame( rafID ); | |
rafID = null; | |
} | |
function toggleMono() { | |
if (audioInput != realAudioInput) { | |
audioInput.disconnect(); | |
realAudioInput.disconnect(); | |
audioInput = realAudioInput; | |
} else { | |
realAudioInput.disconnect(); | |
audioInput = convertToMono( realAudioInput ); | |
} | |
audioInput.connect(inputPoint); | |
} | |
function gotStream(stream) { | |
inputPoint = audioContext.createGain(); | |
// Create an AudioNode from the stream. | |
realAudioInput = audioContext.createMediaStreamSource(stream); | |
audioInput = realAudioInput; | |
audioInput.connect(inputPoint); | |
// audioInput = convertToMono( input ); | |
analyserNode = audioContext.createAnalyser(); | |
analyserNode.fftSize = 2048; | |
inputPoint.connect( analyserNode ); | |
audioRecorder = new Recorder( inputPoint ); | |
zeroGain = audioContext.createGain(); | |
zeroGain.gain.value = 0.0; | |
inputPoint.connect( zeroGain ); | |
zeroGain.connect( audioContext.destination ); | |
} | |
function initAudio() { | |
if (!navigator.getUserMedia) | |
navigator.getUserMedia = navigator.webkitGetUserMedia || navigator.mozGetUserMedia; | |
if (!navigator.cancelAnimationFrame) | |
navigator.cancelAnimationFrame = navigator.webkitCancelAnimationFrame || navigator.mozCancelAnimationFrame; | |
if (!navigator.requestAnimationFrame) | |
navigator.requestAnimationFrame = navigator.webkitRequestAnimationFrame || navigator.mozRequestAnimationFrame; | |
navigator.getUserMedia({audio:true}, gotStream, function(e) { | |
alert('Error getting audio'); | |
console.log(e); | |
}); | |
} | |
window.addEventListener('load', initAudio ); |
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/*License (MIT) | |
Copyright © 2013 Matt Diamond | |
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated | |
documentation files (the "Software"), to deal in the Software without restriction, including without limitation | |
the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and | |
to permit persons to whom the Software is furnished to do so, subject to the following conditions: | |
The above copyright notice and this permission notice shall be included in all copies or substantial portions of | |
the Software. | |
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO | |
THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF | |
CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
DEALINGS IN THE SOFTWARE. | |
*/ | |
(function(window){ | |
var WORKER_PATH = '/static/js/recorderWorker.js'; | |
var Recorder = function(source, cfg){ | |
var config = cfg || {}; | |
var bufferLen = config.bufferLen || 4096; | |
this.context = source.context; | |
if(!this.context.createScriptProcessor){ | |
this.node = this.context.createJavaScriptNode(bufferLen, 2, 2); | |
} else { | |
this.node = this.context.createScriptProcessor(bufferLen, 2, 2); | |
} | |
// config.workerPath || WORKER_PATH | |
var worker = new Worker(WORKER_PATH); | |
worker.postMessage({ | |
command: 'init', | |
config: { | |
sampleRate: this.context.sampleRate | |
} | |
}); | |
var recording = false, | |
currCallback; | |
this.node.onaudioprocess = function(e){ | |
if (!recording) return; | |
worker.postMessage({ | |
command: 'record', | |
buffer: [ | |
e.inputBuffer.getChannelData(0), | |
e.inputBuffer.getChannelData(1) | |
] | |
}); | |
} | |
this.configure = function(cfg){ | |
for (var prop in cfg){ | |
if (cfg.hasOwnProperty(prop)){ | |
config[prop] = cfg[prop]; | |
} | |
} | |
} | |
this.record = function(){ | |
recording = true; | |
} | |
this.stop = function(){ | |
recording = false; | |
} | |
this.clear = function(){ | |
worker.postMessage({ command: 'clear' }); | |
} | |
this.getBuffers = function(cb) { | |
currCallback = cb || config.callback; | |
worker.postMessage({ command: 'getBuffers' }) | |
} | |
this.exportWAV = function(cb, type){ | |
currCallback = cb || config.callback; | |
type = type || config.type || 'audio/wav'; | |
if (!currCallback) throw new Error('Callback not set'); | |
worker.postMessage({ | |
command: 'exportWAV', | |
type: type | |
}); | |
} | |
this.exportMonoWAV = function(cb, type){ | |
currCallback = cb || config.callback; | |
type = type || config.type || 'audio/wav'; | |
if (!currCallback) throw new Error('Callback not set'); | |
worker.postMessage({ | |
command: 'exportMonoWAV', | |
type: type | |
}); | |
} | |
worker.onmessage = function(e){ | |
var blob = e.data; | |
currCallback(blob); | |
} | |
source.connect(this.node); | |
this.node.connect(this.context.destination); // if the script node is not connected to an output the "onaudioprocess" event is not triggered in chrome. | |
}; | |
Recorder.forceDownload = function(blob, filename){ | |
var url = (window.URL || window.webkitURL).createObjectURL(blob); | |
var link = window.document.createElement('a'); | |
link.href = url; | |
link.download = filename || 'output.wav'; | |
var click = document.createEvent("Event"); | |
click.initEvent("click", true, true); | |
link.dispatchEvent(click); | |
} | |
window.Recorder = Recorder; | |
})(window); |
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/*License (MIT) | |
Copyright © 2013 Matt Diamond | |
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated | |
documentation files (the "Software"), to deal in the Software without restriction, including without limitation | |
the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and | |
to permit persons to whom the Software is furnished to do so, subject to the following conditions: | |
The above copyright notice and this permission notice shall be included in all copies or substantial portions of | |
the Software. | |
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO | |
THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF | |
CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
DEALINGS IN THE SOFTWARE. | |
*/ | |
var recLength = 0, | |
recBuffersL = [], | |
recBuffersR = [], | |
sampleRate; | |
this.onmessage = function(e){ | |
switch(e.data.command){ | |
case 'init': | |
init(e.data.config); | |
break; | |
case 'record': | |
record(e.data.buffer); | |
break; | |
case 'exportWAV': | |
exportWAV(e.data.type); | |
break; | |
case 'exportMonoWAV': | |
exportMonoWAV(e.data.type); | |
break; | |
case 'getBuffers': | |
getBuffers(); | |
break; | |
case 'clear': | |
clear(); | |
break; | |
} | |
}; | |
function init(config){ | |
sampleRate = config.sampleRate; | |
} | |
function record(inputBuffer){ | |
recBuffersL.push(inputBuffer[0]); | |
recBuffersR.push(inputBuffer[1]); | |
recLength += inputBuffer[0].length; | |
} | |
function exportWAV(type){ | |
var bufferL = mergeBuffers(recBuffersL, recLength); | |
var bufferR = mergeBuffers(recBuffersR, recLength); | |
var interleaved = interleave(bufferL, bufferR); | |
var dataview = encodeWAV(interleaved); | |
var audioBlob = new Blob([dataview], { type: type }); | |
this.postMessage(audioBlob); | |
} | |
function exportMonoWAV(type){ | |
var bufferL = mergeBuffers(recBuffersL, recLength); | |
var dataview = encodeWAV(bufferL, true); | |
var audioBlob = new Blob([dataview], { type: type }); | |
this.postMessage(audioBlob); | |
} | |
function getBuffers() { | |
var buffers = []; | |
buffers.push( mergeBuffers(recBuffersL, recLength) ); | |
buffers.push( mergeBuffers(recBuffersR, recLength) ); | |
this.postMessage(buffers); | |
} | |
function clear(){ | |
recLength = 0; | |
recBuffersL = []; | |
recBuffersR = []; | |
} | |
function mergeBuffers(recBuffers, recLength){ | |
var result = new Float32Array(recLength); | |
var offset = 0; | |
for (var i = 0; i < recBuffers.length; i++){ | |
result.set(recBuffers[i], offset); | |
offset += recBuffers[i].length; | |
} | |
return result; | |
} | |
function interleave(inputL, inputR){ | |
var length = inputL.length + inputR.length; | |
var result = new Float32Array(length); | |
var index = 0, | |
inputIndex = 0; | |
while (index < length){ | |
result[index++] = inputL[inputIndex]; | |
result[index++] = inputR[inputIndex]; | |
inputIndex++; | |
} | |
return result; | |
} | |
function floatTo16BitPCM(output, offset, input){ | |
for (var i = 0; i < input.length; i++, offset+=2){ | |
var s = Math.max(-1, Math.min(1, input[i])); | |
output.setInt16(offset, s < 0 ? s * 0x8000 : s * 0x7FFF, true); | |
} | |
} | |
function writeString(view, offset, string){ | |
for (var i = 0; i < string.length; i++){ | |
view.setUint8(offset + i, string.charCodeAt(i)); | |
} | |
} | |
function encodeWAV(samples, mono){ | |
var buffer = new ArrayBuffer(44 + samples.length * 2); | |
var view = new DataView(buffer); | |
/* RIFF identifier */ | |
writeString(view, 0, 'RIFF'); | |
/* file length */ | |
view.setUint32(4, 32 + samples.length * 2, true); | |
/* RIFF type */ | |
writeString(view, 8, 'WAVE'); | |
/* format chunk identifier */ | |
writeString(view, 12, 'fmt '); | |
/* format chunk length */ | |
view.setUint32(16, 16, true); | |
/* sample format (raw) */ | |
view.setUint16(20, 1, true); | |
/* channel count */ | |
view.setUint16(22, mono?1:2, true); | |
/* sample rate */ | |
view.setUint32(24, sampleRate, true); | |
/* byte rate (sample rate * block align) */ | |
view.setUint32(28, sampleRate * 4, true); | |
/* block align (channel count * bytes per sample) */ | |
view.setUint16(32, 4, true); | |
/* bits per sample */ | |
view.setUint16(34, 16, true); | |
/* data chunk identifier */ | |
writeString(view, 36, 'data'); | |
/* data chunk length */ | |
view.setUint32(40, samples.length * 2, true); | |
floatTo16BitPCM(view, 44, samples); | |
return view; | |
} |
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