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RecordRTC.js
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// Last time updated at Jan 21, 2015, 08:32:23
// links:
// Open-So
F438
urced: https://github.com/muaz-khan/RecordRTC
// http://cdn.WebRTC-Experiment.com/RecordRTC.js
// http://www.WebRTC-Experiment.com/RecordRTC.js (for China users)
// http://RecordRTC.org/latest.js (for China users)
// npm install recordrtc
// http://recordrtc.org/
// updates?
/*
-. Fixed echo.
-. If MediaStream is suddenly stopped in Firefox.
-. Added "disableLogs" - RecordRTC(stream, { disableLogs: true });
-. You can pass "bufferSize:0" - RecordRTC(stream, { bufferSize: 0 });
-. You can set "leftChannel" - RecordRTC(stream, { leftChannel: true });
-. Fixed MRecordRTC.
-. Added functionality for analyse black frames and cut them - pull#293
-. if you're recording GIF, you must link: https://cdn.webrtc-experiment.com/gif-recorder.js
*/
//------------------------------------
// Browsers Support::
// Chrome (all versions) [ audio/video separately ]
// Firefox ( >= 29 ) [ audio/video in single webm/mp4 container or only audio in ogg ]
// Opera (all versions) [ same as chrome ]
// Android (Chrome) [ only video ]
// Android (Opera) [ only video ]
// Android (Firefox) [ only video ]
//------------------------------------
// Muaz Khan - www.MuazKhan.com
// MIT License - www.WebRTC-Experiment.com/licence
//------------------------------------
// Note: RecordRTC.js is using 3 other libraries; you need to accept their licences as well.
//------------------------------------
// 1. RecordRTC.js
// 2. MRecordRTC.js
// 3. Cross-Browser-Declarations.js
// 4. Storage.js
// 5. MediaStreamRecorder.js
// 6. StereoRecorder.js
// 7. StereoAudioRecorder.js
// 8. CanvasRecorder.js
// 9. WhammyRecorder.js
// 10. Whammy.js
// 11. DiskStorage.js
// 12. GifRecorder.js
//------------------------------------
'use strict';
// ____________
// RecordRTC.js
/**
* {@link https://github.com/muaz-khan/RecordRTC|RecordRTC} is a JavaScript-based media-recording library for modern web-browsers (supporting WebRTC getUserMedia API). It is optimized for different devices and browsers to bring all client-side (pluginfree) recording solutions in single place.
* @summary JavaScript audio/video recording library runs top over WebRTC getUserMedia API.
* @license {@link https://www.webrtc-experiment.com/licence/|MIT}
* @author {@link https://www.MuazKhan.com|Muaz Khan}
* @typedef RecordRTC
* @class
* @example
* var recordRTC = RecordRTC(mediaStream, {
* type: 'video' // audio or video or gif or canvas
* });
*
* // or, you can even use keyword "new"
* var recordRTC = new RecordRTC(mediaStream[, config]);
* @see For further information:
* @see {@link https://github.com/muaz-khan/RecordRTC|RecordRTC Source Code}
*/
function RecordRTC(mediaStream, config) {
config = config || {};
if (!mediaStream) {
throw 'MediaStream is mandatory.';
}
if (!config.type) {
config.type = 'audio';
}
var self = this;
function startRecording() {
if (!config.disableLogs) {
console.debug('started recording ' + config.type + ' stream.');
}
// Media Stream Recording API has not been implemented in chrome yet;
// That's why using WebAudio API to record stereo audio in WAV format
var Recorder = isChrome ? window.StereoRecorder : window.MediaStreamRecorder;
// video recorder (in WebM format)
if (config.type === 'video' && isChrome) {
Recorder = window.WhammyRecorder;
}
// video recorder (in Gif format)
if (config.type === 'gif') {
Recorder = window.GifRecorder;
}
// html2canvas recording!
if (config.type === 'canvas') {
Recorder = window.CanvasRecorder;
}
mediaRecorder = new Recorder(mediaStream);
// Merge all data-types except "function"
mediaRecorder = mergeProps(mediaRecorder, config);
mediaRecorder.onAudioProcessStarted = function() {
if (config.onAudioProcessStarted) {
config.onAudioProcessStarted();
}
};
mediaRecorder.onGifPreview = function(gif) {
if (config.onGifPreview) {
config.onGifPreview(gif);
}
};
mediaRecorder.record();
return self;
}
function stopRecording(callback) {
if (!mediaRecorder) {
return console.warn(WARNING);
}
/*jshint validthis:true */
var recordRTC = this;
if (!config.disableLogs) {
console.warn('Stopped recording ' + config.type + ' stream.');
}
if (config.type !== 'gif') {
mediaRecorder.stop(_callback);
} else {
mediaRecorder.stop();
_callback();
}
function _callback() {
for (var item in mediaRecorder) {
if (self) {
self[item] = mediaRecorder[item];
}
if (recordRTC) {
recordRTC[item] = mediaRecorder[item];
}
}
var blob = mediaRecorder.blob;
if (callback) {
var url = URL.createObjectURL(blob);
callback(url);
}
if (!config.disableLogs) {
console.debug(blob.type, '->', bytesToSize(blob.size));
}
if (!config.autoWriteToDisk) {
return;
}
getDataURL(function(dataURL) {
var parameter = {};
parameter[config.type + 'Blob'] = dataURL;
DiskStorage.Store(parameter);
});
}
}
function getDataURL(callback, _mediaRecorder) {
if (!callback) {
throw 'Pass a callback function over getDataURL.';
}
var blob = _mediaRecorder ? _mediaRecorder.blob : mediaRecorder.blob;
if (!blob) {
if (!config.disableLogs) {
console.warn('Blob encoder did not yet finished its job.');
}
setTimeout(function() {
getDataURL(callback, _mediaRecorder);
}, 1000);
return;
}
if (!!window.Worker) {
var webWorker = processInWebWorker(function readFile(_blob) {
postMessage(new FileReaderSync().readAsDataURL(_blob));
});
webWorker.onmessage = function(event) {
callback(event.data);
};
webWorker.postMessage(blob);
} else {
var reader = new FileReader();
reader.readAsDataURL(blob);
reader.onload = function(event) {
callback(event.target.result);
};
}
function processInWebWorker(_function) {
var blob = URL.createObjectURL(new Blob([_function.toString(),
'this.onmessage = function (e) {readFile(e.data);}'
], {
type: 'application/javascript'
}));
var worker = new Worker(blob);
URL.revokeObjectURL(blob);
return worker;
}
}
var WARNING = 'It seems that "startRecording" is not invoked for ' + config.type + ' recorder.';
var mediaRecorder;
var returnObject = {
/**
* This method starts recording. It doesn't take any argument.
* @method
* @memberof RecordRTC
* @instance
* @example
* recordRTC.startRecording();
*/
startRecording: startRecording,
/**
* This method stops recording. It takes single "callback" argument. It is suggested to get blob or URI in the callback to make sure all encoders finished their jobs.
* @param {function} callback - This callback function is invoked after completion of all encoding jobs.
* @method
* @memberof RecordRTC
* @instance
* @example
* recordRTC.stopRecording(function(videoURL) {
* video.src = videoURL;
* recordRTC.blob; recordRTC.buffer;
* });
* @todo Implement <code class="str">recordRTC.stopRecording().getDataURL(callback);</code>
*/
stopRecording: stopRecording,
/**
* It is equivalent to <code class="str">"recordRTC.blob"</code> property.
* @method
* @memberof RecordRTC
* @instance
* @example
* recordRTC.stopRecording(function() {
* var blob = recordRTC.getBlob();
*
* // equivalent to: recordRTC.blob property
* var blob = recordRTC.blob;
* });
*/
getBlob: function() {
if (!mediaRecorder) {
return console.warn(WARNING);
}
return mediaRecorder.blob;
},
/**
* This method returns DataURL. It takes single "callback" argument.
* @param {function} callback - DataURL is passed back over this callback.
* @method
* @memberof RecordRTC
* @instance
* @example
* recordRTC.stopRecording(function() {
* recordRTC.getDataURL(function(dataURL) {
* video.src = dataURL;
* });
* });
*/
getDataURL: getDataURL,
/**
* This method returns Virutal/Blob URL. It doesn't take any argument.
* @method
* @memberof RecordRTC
* @instance
* @example
* recordRTC.stopRecording(function() {
* video.src = recordRTC.toURL();
* });
*/
toURL: function() {
if (!mediaRecorder) {
return console.warn(WARNING);
}
return URL.createObjectURL(mediaRecorder.blob);
},
/**
* This method saves blob/file into disk (by inovking save-as dialog). It takes single (optional) argument i.e. FileName
* @method
* @memberof RecordRTC
* @instance
* @example
* recordRTC.stopRecording(function() {
* recordRTC.save('file-name');
* });
*/
save: function(fileName) {
if (!mediaRecorder) {
var that = this;
setTimeout(function() {
that.save(fileName);
}, 2000);
return console.warn(WARNING);
}
var hyperlink = document.createElement('a');
hyperlink.href = URL.createObjectURL(mediaRecorder.blob);
hyperlink.target = '_blank';
hyperlink.download = (fileName || (Math.round(Math.random() * 9999999999) + 888888888)) + '.' + mediaRecorder.blob.type.split('/')[1];
var evt = new MouseEvent('click', {
view: window,
bubbles: true,
cancelable: true
});
hyperlink.dispatchEvent(evt);
(window.URL || window.webkitURL).revokeObjectURL(hyperlink.href);
},
/**
* This method gets blob from indexed-DB storage. It takes single "callback" argument.
* @method
* @memberof RecordRTC
* @instance
* @example
* recordRTC.getFromDisk(function(dataURL) {
* video.src = dataURL;
* });
*/
getFromDisk: function(callback) {
if (!mediaRecorder) {
return console.warn(WARNING);
}
RecordRTC.getFromDisk(config.type, callback);
},
/**
* This method appends prepends array of webp images to the recorded video-blob. It takes an "array" object.
* @type {Array.<Array>}
* @param {Array} arrayOfWebPImages - Array of webp images.
* @method
* @memberof RecordRTC
* @instance
* @example
* var arrayOfWebPImages = [];
* arrayOfWebPImages.push({
* duration: index,
* image: 'data:image/webp;base64,...'
* });
* recordRTC.setAdvertisementArray(arrayOfWebPImages);
*/
setAdvertisementArray: function(arrayOfWebPImages) {
this.advertisement = [];
var length = arrayOfWebPImages.length;
for (var i = 0; i < length; i++) {
this.advertisement.push({
duration: i,
image: arrayOfWebPImages[i]
});
}
},
/**
* It is equivalent to <code class="str">"recordRTC.getBlob()"</code> method.
* @property {Blob} blob - Recorded Blob can be accessed using this property.
* @memberof RecordRTC
* @instance
* @example
* recordRTC.stopRecording(function() {
* var blob = recordRTC.blob;
*
* // equivalent to: recordRTC.getBlob() method
* var blob = recordRTC.getBlob();
* });
*/
blob: null,
/**
* @todo Add descriptions.
* @property {number} bufferSize - Either audio device's default buffer-size, or your custom value.
* @memberof RecordRTC
* @instance
* @example
* recordRTC.stopRecording(function() {
* var bufferSize = recordRTC.bufferSize;
* });
*/
bufferSize: 0,
/**
* @todo Add descriptions.
* @property {number} sampleRate - Audio device's default sample rates.
* @memberof RecordRTC
* @instance
* @example
* recordRTC.stopRecording(function() {
* var sampleRate = recordRTC.sampleRate;
* });
*/
sampleRate: 0,
/**
* @todo Add descriptions.
* @property {ArrayBuffer} buffer - Audio ArrayBuffer, supported only in Chrome.
* @memberof RecordRTC
* @instance
* @example
* recordRTC.stopRecording(function() {
* var buffer = recordRTC.buffer;
* });
*/
buffer: null,
/**
* @todo Add descriptions.
* @property {DataView} view - Audio DataView, supported only in Chrome.
* @memberof RecordRTC
* @instance
* @example
* recordRTC.stopRecording(function() {
* var dataView = recordRTC.view;
* });
*/
view: null
};
if (!this) {
return returnObject;
}
// if someone wanna use RecordRTC with "new" keyword.
for (var prop in returnObject) {
this[prop] = returnObject[prop];
}
return returnObject;
}
/**
* This method can be used to get all recorded blobs from IndexedDB storage.
* @param {string} type - 'all' or 'audio' or 'video' or 'gif'
* @param {function} callback - Callback function to get all stored blobs.
* @method
* @memberof RecordRTC
* @example
* RecordRTC.getFromDisk('all', function(dataURL, type){
* if(type === 'audio') { }
* if(type === 'video') { }
* if(type === 'gif') { }
* });
*/
RecordRTC.getFromDisk = function(type, callback) {
if (!callback) {
throw 'callback is mandatory.';
}
console.log('Getting recorded ' + (type === 'all' ? 'blobs' : type + ' blob ') + ' from disk!');
DiskStorage.Fetch(function(dataURL, _type) {
if (type !== 'all' && _type === type + 'Blob' && callback) {
callback(dataURL);
}
if (type === 'all' && callback) {
callback(dataURL, _type.replace('Blob', ''));
}
});
};
/**
* This method can be used to store recorded blobs into IndexedDB storage.
* @param {object} options - {audio: Blob, video: Blob, gif: Blob}
* @method
* @memberof RecordRTC
* @example
* RecordRTC.writeToDisk({
* audio: audioBlob,
* video: videoBlob,
* gif : gifBlob
* });
*/
RecordRTC.writeToDisk = function(options) {
console.log('Writing recorded blob(s) to disk!');
options = options || {};
if (options.audio && options.video && options.gif) {
options.audio.getDataURL(function(audioDataURL) {
options.video.getDataURL(function(videoDataURL) {
options.gif.getDataURL(function(gifDataURL) {
DiskStorage.Store({
audioBlob: audioDataURL,
videoBlob: videoDataURL,
gifBlob: gifDataURL
});
});
});
});
} else if (options.audio && options.video) {
options.audio.getDataURL(function(audioDataURL) {
options.video.getDataURL(function(videoDataURL) {
DiskStorage.Store({
audioBlob: audioDataURL,
videoBlob: videoDataURL
});
});
});
} else if (options.audio && options.gif) {
options.audio.getDataURL(function(audioDataURL) {
options.gif.getDataURL(function(gifDataURL) {
DiskStorage.Store({
audioBlob: audioDataURL,
gifBlob: gifDataURL
});
});
});
} else if (options.video && options.gif) {
options.video.getDataURL(function(videoDataURL) {
options.gif.getDataURL(function(gifDataURL) {
DiskStorage.Store({
videoBlob: videoDataURL,
gifBlob: gifDataURL
});
});
});
} else if (options.audio) {
options.audio.getDataURL(function(audioDataURL) {
DiskStorage.Store({
audioBlob: audioDataURL
});
});
} else if (options.video) {
options.video.getDataURL(function(videoDataURL) {
DiskStorage.Store({
videoBlob: videoDataURL
});
});
} else if (options.gif) {
options.gif.getDataURL(function(gifDataURL) {
DiskStorage.Store({
gifBlob: gifDataURL
});
});
}
};
// _____________
// MRecordRTC.js
/**
* MRecordRTC runs top over {@link RecordRTC} to bring multiple recordings in single place, by providing simple API.
* @summary MRecordRTC stands for "Multiple-RecordRTC".
* @license {@link https://www.webrtc-experiment.com/licence/|MIT}
* @author {@link https://www.MuazKhan.com|Muaz Khan}
* @typedef MRecordRTC
* @class
* @example
* var recorder = new MRecordRTC();
* recorder.addStream(MediaStream);
* recorder.mediaType = {
* audio: true,
* video: true,
* gif: true
* };
* recorder.startRecording();
* @see For further information:
* @see {@link https://github.com/muaz-khan/RecordRTC/tree/master/MRecordRTC|MRecordRTC Source Code}
*/
function MRecordRTC(mediaStream) {
/**
* This method attaches MediaStream object to {@link MRecordRTC}.
* @param {MediaStream} mediaStream - A MediaStream object, either fetched using getUserMedia API, or generated using captureStreamUntilEnded or WebAudio API.
* @method
* @memberof MRecordRTC
* @example
* recorder.addStream(MediaStream);
*/
this.addStream = function(_mediaStream) {
if (_mediaStream) {
mediaStream = _mediaStream;
}
};
/**
* This property can be used to set recording type e.g. audio, or video, or gif, or canvas.
* @property {object} mediaType - {audio: true, video: true, gif: true}
* @memberof MRecordRTC
* @example
* var recorder = new MRecordRTC();
* recorder.mediaType = {
* audio: true,
* video: true,
* gif : true
* };
*/
this.mediaType = {
audio: true,
video: true
};
/**
* This method starts recording.
* @method
* @memberof MRecordRTC
* @example
* recorder.startRecording();
*/
this.startRecording = function() {
if (!isChrome && mediaStream && mediaStream.getAudioTracks && mediaStream.getAudioTracks().length && mediaStream.getVideoTracks().length) {
// Firefox is supporting both audio/video in single blob
this.mediaType.audio = false;
}
if (this.mediaType.audio) {
this.audioRecorder = new RecordRTC(mediaStream, {
type: 'audio',
bufferSize: this.bufferSize,
sampleRate: this.sampleRate
});
this.audioRecorder.startRecording();
}
if (this.mediaType.video) {
this.videoRecorder = new RecordRTC(mediaStream, {
type: 'video',
video: this.video,
canvas: this.canvas
});
this.videoRecorder.startRecording();
}
if (this.mediaType.gif) {
this.gifRecorder = new RecordRTC(mediaStream, {
type: 'gif',
frameRate: this.frameRate || 200,
quality: this.quality || 10
});
this.gifRecorder.startRecording();
}
};
/**
* This method stop recording.
* @param {function} callback - Callback function is invoked when all encoders finish their jobs.
* @method
* @memberof MRecordRTC
* @example
* recorder.stopRecording(function(recording){
* var audioBlob = recording.audio;
* var videoBlob = recording.video;
* var gifBlob = recording.gif;
* });
*/
this.stopRecording = function(callback) {
callback = callback || function() {};
if (this.audioRecorder) {
this.audioRecorder.stopRecording(function(blobURL) {
callback(blobURL, 'audio');
});
}
if (this.videoRecorder) {
this.videoRecorder.stopRecording(function(blobURL) {
callback(blobURL, 'video');
});
}
if (this.gifRecorder) {
this.gifRecorder.stopRecording(function(blobURL) {
callback(blobURL, 'gif');
});
}
};
/**
* This method can be used to manually get all recorded blobs.
* @param {function} callback - All recorded blobs are passed back to "callback" function.
* @method
* @memberof MRecordRTC
* @example
* recorder.getBlob(function(recording){
* var audioBlob = recording.audio;
* var videoBlob = recording.video;
* var gifBlob = recording.gif;
* });
*/
this.getBlob = function(callback) {
var output = {};
if (this.audioRecorder) {
output.audio = this.audioRecorder.getBlob();
}
if (this.videoRecorder) {
output.video = this.videoRecorder.getBlob();
}
if (this.gifRecorder) {
output.gif = this.gifRecorder.getBlob();
}
if (callback) {
callback(output);
}
};
/**
* This method can be used to manually get all recorded blobs' DataURLs.
* @param {function} callback - All recorded blobs' DataURLs are passed back to "callback" function.
* @method
* @memberof MRecordRTC
* @example
* recorder.getDataURL(function(recording){
* var audioDataURL = recording.audio;
* var videoDataURL = recording.video;
* var gifDataURL = recording.gif;
* });
*/
this.getDataURL = function(callback) {
this.getBlob(function(blob) {
getDataURL(blob.audio, function(_audioDataURL) {
getDataURL(blob.video, function(_videoDataURL) {
callback({
audio: _audioDataURL,
video: _videoDataURL
});
});
});
});
function getDataURL(blob, callback00) {
if (!!window.Worker) {
var webWorker = processInWebWorker(function readFile(_blob) {
postMessage(new FileReaderSync().readAsDataURL(_blob));
});
webWorker.onmessage = function(event) {
callback00(event.data);
};
webWorker.postMessage(blob);
} else {
var reader = new FileReader();
reader.readAsDataURL(blob);
reader.onload = function(event) {
callback00(event.target.result);
};
}
}
function processInWebWorker(_function) {
var blob = URL.createObjectURL(new Blob([_function.toString(),
'this.onmessage = function (e) {readFile(e.data);}'
], {
type: 'application/javascript'
}));
var worker = new Worker(blob);
URL.revokeObjectURL(blob);
return worker;
}
};
/**
* This method can be used to ask {@link MRecordRTC} to write all recorded blobs into IndexedDB storage.
* @method
* @memberof MRecordRTC
* @example
* recorder.writeToDisk();
*/
this.writeToDisk = function() {
RecordRTC.writeToDisk({
audio: this.audioRecorder,
video: this.videoRecorder,
gif: this.gifRecorder
});
};
/**
* This method can be used to invoke save-as dialog for all recorded blobs.
* @param {object} args - {audio: 'audio-name', video: 'video-name', gif: 'gif-name'}
* @method
* @memberof MRecordRTC
* @example
* recorder.save({
* audio: 'audio-file-name',
* video: 'video-file-name',
* gif : 'gif-file-name'
* });
*/
this.save = function(args) {
args = args || {
audio: true,
video: true,
gif: true
};
if (!!args.audio && this.audioRecorder) {
this.audioRecorder.save(typeof args.audio === 'string' ? args.audio : '');
}
if (!!args.video && this.videoRecorder) {
this.videoRecorder.save(typeof args.video === 'string' ? args.video : '');
}
if (!!args.gif && this.gifRecorder) {
this.gifRecorder.save(typeof args.gif === 'string' ? args.gif : '');
}
};
}
/**
* This method can be used to get all recorded blobs from IndexedDB storage.
* @param {string} type - 'all' or 'audio' or 'video' or 'gif'
* @param {function} callback - Callback function to get all stored blobs.
* @method
* @memberof MRecordRTC
* @example
* MRecordRTC.getFromDisk('all', function(dataURL, type){
* if(type === 'audio') { }
* if(type === 'video') { }
* if(type === 'gif') { }
* });
*/
MRecordRTC.getFromDisk = RecordRTC.getFromDisk;
/**
* This method can be used to store recorded blobs into IndexedDB storage.
* @param {object} options - {audio: Blob, video: Blob, gif: Blob}
* @method
* @memberof MRecordRTC
* @example
* MRecordRTC.writeToDisk({
* audio: audioBlob,
* video: videoBlob,
* gif : gifBlob
* });
*/
MRecordRTC.writeToDisk = RecordRTC.writeToDisk;
// _____________________________
// Cross-Browser-Declarations.js
// animation-frame used in WebM recording
if (!window.requestAnimationFrame) {
window.requestAnimationFrame = window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
}
if (!window.cancelAnimationFrame) {
window.cancelAnimationFrame = window.webkitCancelAnimationFrame || window.mozCancelAnimationFrame;
}
// WebAudio API representer
if (!window.AudioContext) {
window.AudioContext = window.webkitAudioContext || window.mozAudioContext;
}
window.URL = window.URL || window.webkitURL;
navigator.getUserMedia = navigator.webkitGetUserMedia || navigator.mozGetUserMedia;
if (window.webkitMediaStream) {
window.MediaStream = window.webkitMediaStream;
}
var isChrome = !!navigator.webkitGetUserMedia;
// Merge all other data-types except "function"
/**
* @param {object} mergein - Merge another object in this object.
* @param {object} mergeto - Merge this object in another object.
* @returns {object} - merged object
* @example
* var mergedObject = mergeProps({}, {
* x: 10, // this will be merged
* y: 10, // this will be merged
* add: function() {} // this will be skipped
* });
*/
function mergeProps(mergein, mergeto) {
mergeto = reformatProps(mergeto);
for (var t in mergeto) {
if (typeof mergeto[t] !== 'function') {
mergein[t] = mergeto[t];
}
}
return mergein;
}
/**
* @param {object} obj - If a property name is "sample-rate"; it will be converted into "sampleRate".
* @returns {object} - formatted object.
* @example
* var mergedObject = reformatProps({
* 'sample-rate': 44100,
* 'buffer-size': 4096
* });
*
* mergedObject.sampleRate === 44100
* mergedObject.bufferSize === 4096
*/
function reformatProps(obj) {
var output = {};
for (var o in obj) {
if (o.indexOf('-') !== -1) {
var splitted = o.split('-');
var name = splitted[0] + splitted[1].split('')[0].toUpperCase() + splitted[1].substr(1);
output[name] = obj[o];
} else {
output[o] = obj[o];
}
}
return output;
}
if (location.href.indexOf('file:') === 0) {
console.error('Please load this HTML file on HTTP or HTTPS.');
}
// below function via: http://goo.gl/B3ae8c
/**
* @param {number} bytes - Pass bytes and get formafted string.
* @returns {string} - formafted string
* @example
* bytesToSize(1024*1024*5) === '5 GB'
*/
function bytesToSize(bytes) {
var k = 1000;
var sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
if (bytes === 0) {
return '0 Bytes';
}
var i = parseInt(Math.floor(Math.log(bytes) / Math.log(k)), 10);
return (bytes / Math.pow(k, i)).toPrecision(3) + ' ' + sizes[i];
}
// __________ (used to handle stuff like http://goo.gl/xmE5eg) issue #129
// Storage.js
/**
* Storage is a standalone object used by {@link RecordRTC} to store reusable objects e.g. "new AudioContext".
* @example
* Storage.AudioContext === webkitAudioContext
* @property {webkitAudioContext} AudioContext - Keeps a reference to AudioContext object.
*/
var Storage = {
AudioContext: window.AudioContext || window.webkitAudioContext
};
// ______________________
// MediaStreamRecorder.js
// todo: need to show alert boxes for incompatible cases
// encoder only supports 48k/16k mono audio channel
/*
* Implementation of https://dvcs.w3.org/hg/dap/raw-file/default/media-stream-capture/MediaRecorder.html
* The MediaRecorder accepts a mediaStream as input source passed from UA. When recorder starts,
* a MediaEncoder will be created and accept the mediaStream as input source.
* Encoder will get the raw data by track data changes, encode it by selected MIME Type, then store the encoded in EncodedBufferCache object.
* The encoded data will be extracted on every timeslice passed from Start function call or by RequestData function.
* Thread model:
* When the recorder starts, it creates a "Media Encoder" thread to read data from MediaEncoder object and store buffer in EncodedBufferCache object.
* Also extract the encoded data and create blobs on every timeslice passed from start function or RequestData function called by UA.
*/
/**
* MediaStreamRecorder is an abstraction layer for "MediaRecorder API". It is used by {@link RecordRTC} to record MediaStream(s) in Firefox.