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1dcd9d6 Mar 26, 2017
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iosrtc API

The top level iosrtc module is a JavaScript Object containing all the WebRTC classes and functions.

The iosrtc module is exposed within the window.cordova.plugins namespace (Cordova plugins convention). Example:

var pc = new cordova.plugins.iosrtc.RTCPeerConnection({
  iceServers: []
});

cordova.plugins.iosrtc.getUserMedia(
  // constraints
  { audio: true, video: true },
  // success callback
  function (stream) {
    console.log('got local MediaStream: ', stream);

    pc.addStream(stream);
  },
  // failure callback
  function (error) {
    console.error('getUserMedia failed: ', error);
  }
);

iosrtc.getUserMedia()

Implementation of the getUserMedia() function as specified by the W3C Media Capture and Streams draft.

The function allows both the old/deprecated callbacks based syntax and the new one based on Promises (depending on the number and type of the given arguments).

NOTE: In iOS devices there are a single audio input (mic) and two video inputs (camera). If the given constraints do not include "video.deviceId" the device chosen by default is the front camera.

Constraints can be applied to the local video by using the latest W3C specification. Currently just the following constraints are supported:

  • video.deviceId
  • video.width.min
  • video.width.max
  • video.height.min
  • video.height.max
  • video.frameRate
  • video.frameRate.min
  • video.frameRate.max
cordova.plugins.iosrtc.getUserMedia({
  audio: true,
  video: {
    deviceId: 'com.apple.avfoundation.avcapturedevice.built-in_video:1',
    width: {
      min: 320,
      max: 640
    },
    frameRate: {
      min: 1.0,
      max: 60.0
    }
  }
});

NOTE: The API to select a specific device is outdated, but it matches the one currently implemented by Chrome browser.

TODO:

  • Rich constraints.

iosrtc.enumerateDevices()

Implementation of the enumerateDevices() function as specified in the W3C Media Capture and Streams draft.

The function allows both the old/deprecated callbacks based syntax and the new one based on Promises.

The success callback is called with a list of MediaDeviceInfo objects as defined in the same spec. However such an object includes deprecated fields for backwards compatibility. The read-only fields in a MediaDeviceInfo object are:

  • deviceId (String)
  • kind (String)
  • label (String)
  • groupId (always an empty string)
  • id (same as deviceId, deprecated)
  • facing (always an empty string, deprecated)

NOTE: The deviceId or id field is the value to be used in the deviceId field of getUserMedia() above to choose a specific device.

iosrtc.RTCPeerConnection

Exposes the RTCPeerConnection class as defined by the W3C Real-time Communication Between Browsers draft.

All the methods are implemented in both fashions: the deprecated callbacks based syntax and the new one based on Promises.

TODO:

  • updateIce() method.
  • Can not use id value greater than 1023 in the config object for createDataChannel() (see issue #4618).

iosrtc.RTCSessionDescription

Exposes the RTCSessionDescription class as defined by the spec.

iosrtc.RTCIceCandidate

Exposes the RTCIceCandidate class as defined by the spec.

iosrtc.MediaStream

Exposes the MediaStream class as defined in the spec.

NOTES:

  • For internal reasons the MediaStream class points to the Blob class, so the MediaStream class constructor is not implemented (this class is exposed to make some WebRTC polyfill libraries happy).
  • stop() method implemented for backwards compatibility (it calls stop() on all its MediaStreamTracks).

TODO:

  • clone() method.

iosrtc.MediaStreamTrack

Exposes the MediaStreamTrack class as defined by the spec.

NOTE: The only reason to make this class public is to expose the deprecated MediaStreamTrack.getSources() class function, which is an "alias" to the enumerateDevices() function described above.

TODO:

  • muted attribute (not exposed by the Objective-C wrapper of the Google WebRTC library).
  • onmute and onunmute events.
  • clone() methods.
  • getCapabilities() method.
  • getConstraints() method.
  • getSettings() method.
  • applyConstraints() method.
  • onoverconstrained event.

iosrtc.refreshVideos()

When calling this method, the height/width, opacity, visibility and z-index of all the HTML5 video elements rendering a MediaStream are recomputed and the iOS native UIView layer updated according.

Call this method when the position or size of a video element changes.

iosrtc.observeVideo(video)

Tell the plugin that it must monitor the given HTML5 video element.

NOTE: This method should just be used for those <video> elements not yet inserted into the DOM in which the app want to attach a MediaStream. If the video element is already placed into the DOM at the time a MediaStream is attached to it then calling this method is not needed at all.

peerconnection.addEventListener('addstream', function (event) {
  // Create a video element in memory (not yet in the DOM).
  var video = document.createElement('video');

  // Tell the plugin to monitor it.
  cordova.plugins.iosrtc.observeVideo(video);

  // Attach the MediaStream to it.
  video.src = URL.createObjectURL(event.stream);

  // When the stream is ready to be rendered then append the video
  // element to the DOM.
  video.addEventListener('canplay', function () {
    document.getElementById('videoContainer').appendChild(video);
  });
});

iosrtc.registerGlobals()

By calling this method the JavaScript global namespace gets "polluted" with the following additions:

  • navigator.getUserMedia
  • navigator.webkitGetUserMedia
  • navigator.mediaDevices.getUserMedia
  • navigator.mediaDevices.enumerateDevices
  • window.RTCPeerConnection
  • window.webkitRTCPeerConnection
  • window.RTCSessionDescription
  • window.RTCIceCandidate
  • window.MediaStream
  • window.webkitMediaStream
  • window.MediaStreamTrack

Useful to avoid iOS specified code in your HTML5 application.

iosrtc.debug

The debug module. Useful to enable verbose logging:

cordova.plugins.iosrtc.debug.enable('iosrtc*');

Others

RTCDataChannel

The RTCDataChannel class (as defined in the spec) is not directly exposed by iosrtc via public API. Instead an instance of RTCDataChannel is returned by createDataChannel() and provided by the ondatachannel event.

The full DataChannel API is implemented (including binary messages).

TODO:

  • binaryType just accepts arraybuffer (same as Chrome browser).