98 lines
2.5 KiB
JavaScript
98 lines
2.5 KiB
JavaScript
(function(window){
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var WORKER_PATH = 'recorderWorker.js';
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var Recorder = function(source, cfg){
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var config = cfg || {};
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var bufferLen = config.bufferLen || 4096;
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this.context = source.context;
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this.node = (this.context.createScriptProcessor ||
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this.context.createJavaScriptNode).call(this.context,
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bufferLen, 2, 2);
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var worker = new Worker(config.workerPath || WORKER_PATH);
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worker.postMessage({
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command: 'init',
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config: {
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sampleRate: this.context.sampleRate
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}
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});
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var recording = false,
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currCallback;
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var self = this;
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this.node.onaudioprocess = function(e){
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if (!recording) return;
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self.ondata && self.ondata(e.inputBuffer.getChannelData(0));
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worker.postMessage({
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command: 'record',
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buffer: [
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e.inputBuffer.getChannelData(0),
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e.inputBuffer.getChannelData(1)
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]
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});
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}
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this.configure = function(cfg){
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for (var prop in cfg){
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if (cfg.hasOwnProperty(prop)){
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config[prop] = cfg[prop];
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}
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}
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}
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this.record = function(){
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recording = true;
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}
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this.stop = function(){
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recording = false;
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}
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this.clear = function(){
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worker.postMessage({ command: 'clear' });
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}
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this.getBuffer = function(cb) {
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currCallback = cb || config.callback;
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worker.postMessage({ command: 'getBuffer' })
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}
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this.exportWAV = function(cb, type){
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currCallback = cb || config.callback;
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type = type || config.type || 'audio/wav';
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if (!currCallback) throw new Error('Callback not set');
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worker.postMessage({
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command: 'exportWAV',
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type: type
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});
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}
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this.shutdown = function(){
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worker.terminate();
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source.disconnect();
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this.node.disconnect();
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};
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worker.onmessage = function(e){
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var blob = e.data;
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currCallback(blob);
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}
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source.connect(this.node);
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this.node.connect(this.context.destination); //this should not be necessary
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};
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Recorder.forceDownload = function(blob, filename){
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var url = (window.URL || window.webkitURL).createObjectURL(blob);
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var link = window.document.createElement('a');
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link.href = url;
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link.download = filename || 'output.wav';
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var click = document.createEvent("Event");
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click.initEvent("click", true, true);
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link.dispatchEvent(click);
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}
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window.Recorder = Recorder;
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})(window);
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