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main.js
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main.js
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/*
* Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree.
*/
// This code is adapted from
// https://rawgit.com/Miguelao/demos/master/mediarecorder.html
'use strict';
/* globals MediaRecorder */
let mediaRecorder;
let recordedBlobs;
const codecPreferences = document.querySelector('#codecPreferences');
const errorMsgElement = document.querySelector('span#errorMsg');
const recordedVideo = document.querySelector('video#recorded');
const recordButton = document.querySelector('button#record');
recordButton.addEventListener('click', () => {
if (recordButton.textContent === 'Start Recording') {
startRecording();
} else {
stopRecording();
recordButton.textContent = 'Start Recording';
playButton.disabled = false;
downloadButton.disabled = false;
codecPreferences.disabled = false;
}
});
const playButton = document.querySelector('button#play');
playButton.addEventListener('click', () => {
const mimeType = codecPreferences.options[codecPreferences.selectedIndex].value.split(';', 1)[0];
const superBuffer = new Blob(recordedBlobs, {type: mimeType});
recordedVideo.src = null;
recordedVideo.srcObject = null;
recordedVideo.src = window.URL.createObjectURL(superBuffer);
recordedVideo.controls = true;
recordedVideo.play();
});
const downloadButton = document.querySelector('button#download');
downloadButton.addEventListener('click', () => {
const mimeType = codecPreferences.options[codecPreferences.selectedIndex].value.split(';', 1)[0];
const blob = new Blob(recordedBlobs, {type: mimeType});
const url = window.URL.createObjectURL(blob);
const a = document.createElement('a');
a.style.display = 'none';
a.href = url;
a.download = mimeType === 'video/mp4' ? 'test.mp4' : 'test.webm';
document.body.appendChild(a);
a.click();
setTimeout(() => {
document.body.removeChild(a);
window.URL.revokeObjectURL(url);
}, 100);
});
function handleDataAvailable(event) {
console.log('handleDataAvailable', event);
if (event.data && event.data.size > 0) {
recordedBlobs.push(event.data);
}
}
function getSupportedMimeTypes() {
const possibleTypes = [
'video/webm;codecs=vp9,opus',
'video/webm;codecs=vp8,opus',
'video/webm;codecs=h264,opus',
'video/webm;codecs=av01,opus',
'video/mp4;codecs=h264,aac',
'video/mp4;codecs=avc1,mp4a.40.2',
'video/mp4',
];
return possibleTypes.filter(mimeType => {
return MediaRecorder.isTypeSupported(mimeType);
});
}
async function startRecording() {
recordedBlobs = [];
const mimeType = codecPreferences.options[codecPreferences.selectedIndex].value;
const options = {mimeType};
if (mimeType.split(';', 1)[0] === 'video/mp4') {
// Adjust sampling rate to 48khz.
const track = window.stream.getAudioTracks()[0];
const {sampleRate} = track.getSettings();
if (sampleRate != 48000) {
track.stop();
window.stream.removeTrack(track);
const newStream = await navigator.mediaDevices.getUserMedia({audio: {sampleRate: 48000}});
window.stream.addTrack(newStream.getTracks()[0]);
}
}
try {
mediaRecorder = new MediaRecorder(window.stream, options);
} catch (e) {
console.error('Exception while creating MediaRecorder:', e);
errorMsgElement.innerHTML = `Exception while creating MediaRecorder: ${JSON.stringify(e)}`;
return;
}
console.log('Created MediaRecorder', mediaRecorder, 'with options', options);
recordButton.textContent = 'Stop Recording';
playButton.disabled = true;
downloadButton.disabled = true;
codecPreferences.disabled = true;
mediaRecorder.onstop = (event) => {
console.log('Recorder stopped: ', event);
console.log('Recorded Blobs: ', recordedBlobs);
};
mediaRecorder.ondataavailable = handleDataAvailable;
mediaRecorder.start();
console.log('MediaRecorder started', mediaRecorder);
}
function stopRecording() {
mediaRecorder.stop();
}
function handleSuccess(stream) {
recordButton.disabled = false;
console.log('getUserMedia() got stream:', stream);
window.stream = stream;
const gumVideo = document.querySelector('video#gum');
gumVideo.srcObject = stream;
getSupportedMimeTypes().forEach(mimeType => {
const option = document.createElement('option');
option.value = mimeType;
option.innerText = option.value;
codecPreferences.appendChild(option);
});
codecPreferences.disabled = false;
}
async function init(constraints) {
try {
const stream = await navigator.mediaDevices.getUserMedia(constraints);
handleSuccess(stream);
} catch (e) {
console.error('navigator.getUserMedia error:', e);
errorMsgElement.innerHTML = `navigator.getUserMedia error:${e.toString()}`;
}
}
document.querySelector('button#start').addEventListener('click', async () => {
document.querySelector('button#start').disabled = true;
const hasEchoCancellation = document.querySelector('#echoCancellation').checked;
const constraints = {
audio: {
echoCancellation: {exact: hasEchoCancellation}
},
video: {
width: 1280, height: 720
}
};
console.log('Using media constraints:', constraints);
await init(constraints);
});