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| 1 /** |
| 2 * Copyright 2017 The Chromium Authors. All rights reserved. |
| 3 * Use of this source code is governed by a BSD-style license that can be |
| 4 * found in the LICENSE file. |
| 5 */ |
| 6 |
| 7 /** |
| 8 * Aggregate target bits per second for encoding of the Audio track. |
| 9 * @private |
| 10 */ |
| 11 const AUDIO_BITS_PER_SECOND = 3000000; |
| 12 |
| 13 var doneCapturing = false; |
| 14 |
| 15 /** |
| 16 * Starts the audio capturing. |
| 17 * |
| 18 * @param {Number} The duration of the capture in seconds. |
| 19 */ |
| 20 function startAudioCapture(capture_duration_in_seconds, output_file) { |
| 21 console.log('Started capturing for ' + capture_duration_in_seconds + 's to ' |
| 22 + output_file); |
| 23 var inputElement = document.getElementById('remote-view'); |
| 24 |
| 25 // |audioBitsPerSecond| must set to a large number to throw as little |
| 26 // information away as possible. |
| 27 var mediaRecorderOptions = { |
| 28 audioBitsPerSecond: AUDIO_BITS_PER_SECOND, |
| 29 mimeType: 'audio/webm', |
| 30 }; |
| 31 var stream = inputElement.srcObject; |
| 32 var mediaRecorder = new MediaRecorder(stream, mediaRecorderOptions); |
| 33 |
| 34 var audio_chunks = []; |
| 35 |
| 36 mediaRecorder.ondataavailable = function(recording) { |
| 37 audio_chunks.push(recording.data); |
| 38 } |
| 39 mediaRecorder.onstop = function() { |
| 40 var audioBlob = new Blob(audio_chunks, {type: 'audio/webm'}); |
| 41 |
| 42 var url = window.URL.createObjectURL(audioBlob); |
| 43 var a = document.createElement('a'); |
| 44 document.body.appendChild(a); |
| 45 |
| 46 a.href = url; |
| 47 a.download = output_file; |
| 48 a.click(); |
| 49 |
| 50 doneCapturing = true; |
| 51 } |
| 52 |
| 53 mediaRecorder.start(); |
| 54 setTimeout(function() { mediaRecorder.stop(); }, |
| 55 capture_duration_in_seconds * 1000); |
| 56 |
| 57 returnToTest('ok-capturing'); |
| 58 } |
| 59 |
| 60 function testIsDoneCapturing() { |
| 61 returnToTest(doneCapturing.toString()); |
| 62 } |
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