api: initial implementation of MediaStreamTrack.getSettings

Implemented for video streams. It currently implements height, width and
frameRate, taking their effective values on track creation.

Author: saghul

MediaStreamTrack.js

@@ -21,6 +21,8 @@ type MediaStreamTrackState = "live" | "ended";
 class MediaStreamTrack extends EventTarget(MEDIA_STREAM_TRACK_EVENTS) {
   _constraints: Object;
   _enabled: boolean;
+  _settings: Object;
+
   id: string;
   kind: string;
   label: string;
@@ -39,6 +41,8 @@ class MediaStreamTrack extends EventTarget(MEDIA_STREAM_TRACK_EVENTS) {
 
     this._constraints = info.constraints || {};
     this._enabled = info.enabled;
+    this._settings = info.settings || {};
+
     this.id = info.id;
     this.kind = info.kind;
     this.label = info.label;
@@ -103,7 +107,7 @@ class MediaStreamTrack extends EventTarget(MEDIA_STREAM_TRACK_EVENTS) {
   }
 
   getSettings() {
-    throw new Error('Not implemented.');
+    return deepClone(this._settings);
   }
 
   release() {

android/src/main/java/com/oney/WebRTCModule/AbstractVideoCaptureController.java

@@ -30,6 +30,18 @@ public void dispose() {
         }
     }
 
+    public int getHeight() {
+        return height;
+    }
+
+    public int getWidth() {
+        return width;
+    }
+
+    public int getFrameRate() {
+        return fps;
+    }
+
     public VideoCapturer getVideoCapturer() {
         return videoCapturer;
     }

android/src/main/java/com/oney/WebRTCModule/GetUserMediaImpl.java

@@ -332,6 +332,17 @@ private void createStream(MediaStreamTrack[] tracks, BiConsumer<String, ArrayLis
             trackInfo.putString("label", trackId);
             trackInfo.putString("readyState", track.state().toString());
             trackInfo.putBoolean("remote", false);
+
+            if (track instanceof VideoTrack) {
+                TrackPrivate tp = this.tracks.get(trackId);
+                AbstractVideoCaptureController vcc = tp.videoCaptureController;
+                WritableMap settings = Arguments.createMap();
+                settings.putInt("height", vcc.getHeight());
+                settings.putInt("width", vcc.getWidth());
+                settings.putInt("frameRate", vcc.getFrameRate());
+                trackInfo.putMap("settings", settings);
+            }
+
             tracksInfo.add(trackInfo);
         }
 

ios/RCTWebRTC/VideoCaptureController.h

@@ -6,6 +6,9 @@
 
 @interface VideoCaptureController : CaptureController
 
+@property (nonatomic, readonly, copy) AVCaptureDeviceFormat *selectedFormat;
+@property (nonatomic, readonly) int frameRate;
+
 -(instancetype)initWithCapturer:(RTCCameraVideoCapturer *)capturer
                  andConstraints:(NSDictionary *)constraints;
 -(void)startCapture;

ios/RCTWebRTC/VideoCaptureController.m

@@ -14,6 +14,8 @@ @implementation VideoCaptureController {
     int _fps;
 }
 
+@dynamic frameRate;
+
 -(instancetype)initWithCapturer:(RTCCameraVideoCapturer *)capturer
                  andConstraints:(NSDictionary *)constraints {
     self = [super init];
@@ -79,6 +81,8 @@ -(void)startCapture {
         return;
     }
 
+    _selectedFormat = format;
+
     RCTLog(@"[VideoCaptureController] Capture will start");
 
     // Starting the capture happens on another thread. Wait for it.
@@ -121,6 +125,10 @@ -(void)switchCamera {
     [self startCapture];
 }
 
+-(int)frameRate {
+    return _fps;
+}
+
 #pragma mark Private
 
 - (AVCaptureDevice *)findDeviceForPosition:(AVCaptureDevicePosition)position {

ios/RCTWebRTC/WebRTCModule+RTCMediaStream.m

@@ -151,14 +151,31 @@ - (RTCVideoTrack *)createScreenCaptureVideoTrack {
     NSString *trackId = track.trackId;
 
     self.localTracks[trackId] = track;
+    
+    NSDictionary *settings = @{};
+    if ([track.kind isEqualToString:@"video"]) {
+        RTCVideoTrack *videoTrack = (RTCVideoTrack *)track;
+        VideoCaptureController *vcc = (VideoCaptureController *)videoTrack.captureController;
+        AVCaptureDeviceFormat *format = vcc.selectedFormat;
+        CMVideoDimensions dimensions = CMVideoFormatDescriptionGetDimensions(format.formatDescription);
+        settings = @{
+            @"height": @(dimensions.height),
+            @"width": @(dimensions.width),
+            @"frameRate": @(3)
+        };
+    }
+
     [tracks addObject:@{
                         @"enabled": @(track.isEnabled),
                         @"id": trackId,
                         @"kind": track.kind,
                         @"label": trackId,
                         @"readyState": @"live",
-                        @"remote": @(NO)
+                        @"remote": @(NO),
+                        @"settings": settings
                         }];
+
+
   }
 
   self.localStreams[mediaStreamId] = mediaStream;