[WIP] Flutter Web (WIP, don't merge)

[rostopira]

Adds support for Flutter Web

• P2P
• Data Channel (text)
• Data Channel (binary)
• getUserMedia
• getDisplayMedia
• getSources
• Sending video/audio
• Displaying video/audio (waiting for pr merge)
• Capture frame (works only once for no reason)
• Video/audio recording (gives blob)
• Camera switch

Linked issue #85

[rostopira]

@cloudwebrtc As you can see, there is some code duplication
What about moving all enums to another file like enums.dart?

[rostopira]

Note: in every file you can see imports:

// ignore: uri_does_not_exist
import 'dart:html' as HTML;
// ignore: uri_does_not_exist
import 'dart:js' as JS;

This is required to force Dart Analyzer to shut up

[cloudwebrtc]

@cloudwebrtc As you can see, there is some code duplication
What about moving all enums to another file like enums.dart?

Yes, this is a good idea.

[rostopira]

HtmlElementView is now available on master, but...

  /// The unique identifier for the HTML view type to be embedded by this widget.
  ///
  /// A PlatformViewFactory for this type must have been registered.

But it's not exposed API, so registering view factory requires some hackery with modifying engine files, but I were curious about it, so I even created and run PoC

I will continue tracking PR's in master branch, and will provide working code asap

[rostopira]

Dart Analyzer will yell on this, just ignore it

[cloudwebrtc]

@rostopira Great, just now, I tried the branch and getUserMedia works fine.

[rostopira]

@cloudwebrtc For now I can't get multiple videos, video needs additional play() if you navigated to another page and back, multiple issues with frame capture and recording on OS X (windows is fine), everything else is pretty working in my project (P2P/video/audio)

[cloudwebrtc]

I tried to debug it, but vscode doesn't seem to be able to debug the flutter web project, I will try again on the weekend.

[cloudwebrtc]

@rostopira I have modified getDisplayMedia to get the screen object, but I get it to JsObject. I haven't found a way to convert this JsObject to MediaStream. Because it is stored in a private variable.

[cloudwebrtc]

getDisplayMedia is working fine.

[cloudwebrtc]

Switch camera in Chrome will trigger SDP re-negotiation, I have not found a better way. :(