webrtc-samples/src/content/devices/input-output/js/main.js

Project checking for WebRTC GitHub samples repo

/*
 *  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.
 */

'use strict';

var videoElement = document.querySelector('video');
var audioInputSelect = document.querySelector('select#audioSource');
var audioOutputSelect = document.querySelector('select#audioOutput');
var videoSelect = document.querySelector('select#videoSource');
var selectors = [audioInputSelect, audioOutputSelect, videoSelect];

function gotDevices(deviceInfos) {
  // Handles being called several times to update labels. Preserve values.
  var values = selectors.map(function(select) {
    return select.value;
  });
  selectors.forEach(function(select) {
    while (select.firstChild) {
      select.removeChild(select.firstChild);
    }
  });
  for (var i = 0; i !== deviceInfos.length; ++i) {
    var deviceInfo = deviceInfos[i];
    var option = document.createElement('option');
    option.value = deviceInfo.deviceId;
    if (deviceInfo.kind === 'audioinput') {
      option.text = deviceInfo.label ||
        'microphone ' + (audioInputSelect.length + 1);
      audioInputSelect.appendChild(option);
    } else if (deviceInfo.kind === 'audiooutput') {
      option.text = deviceInfo.label || 'speaker ' +
          (audioOutputSelect.length + 1);
      audioOutputSelect.appendChild(option);
    } else if (deviceInfo.kind === 'videoinput') {
      option.text = deviceInfo.label || 'camera ' + (videoSelect.length + 1);
      videoSelect.appendChild(option);
    } else {
      console.log('Some other kind of source/device: ', deviceInfo);
    }
  }
  selectors.forEach(function(select, selectorIndex) {
    if (Array.prototype.slice.call(select.childNodes).some(function(n) {
      return n.value === values[selectorIndex];
    })) {
      select.value = values[selectorIndex];
    }
  });
}

navigator.mediaDevices.enumerateDevices()
.then(gotDevices)
.catch(errorCallback);

function errorCallback(error) {
  console.log('navigator.getUserMedia error: ', error);
}

// Attach audio output device to video element using device/sink ID.
function attachSinkId(element, sinkId) {
  if (typeof element.sinkId !== 'undefined') {
    element.setSinkId(sinkId)
    .then(function() {
      console.log('Success, audio output device attached: ' + sinkId);
    })
    .catch(function(error) {
      var errorMessage = error;
      if (error.name === 'SecurityError') {
        errorMessage = 'You need to use HTTPS for selecting audio output ' +
            'device: ' + error;
      }
      console.error(errorMessage);
      // Jump back to first output device in the list as it's the default.
      audioOutputSelect.selectedIndex = 0;
    });
  } else {
    console.warn('Browser does not support output device selection.');
  }
}

function changeAudioDestination() {
  var audioDestination = audioOutputSelect.value;
  attachSinkId(videoElement, audioDestination);
}

function start() {
  if (window.stream) {
    window.stream.getTracks().forEach(function(track) {
      track.stop();
    });
  }
  var audioSource = audioInputSelect.value;
  var videoSource = videoSelect.value;
  var constraints = {
    audio: {deviceId: audioSource ? {exact: audioSource} : undefined},
    video: {deviceId: videoSource ? {exact: videoSource} : undefined}
  };
  navigator.mediaDevices.getUserMedia(constraints)
  .then(function(stream) {
    window.stream = stream; // make stream available to console
    videoElement.srcObject = stream;
    // Refresh button list in case labels have become available
    return navigator.mediaDevices.enumerateDevices();
  })
  .then(gotDevices)
  .catch(errorCallback);
}

audioInputSelect.onchange = start;
audioOutputSelect.onchange = changeAudioDestination;
videoSelect.onchange = start;

start();