Producer: don't try to clone track if track.clone() is not supported …

…(React-Native)

TODO.md

@@ -17,3 +17,11 @@
 * Should not ignore pseudo media codecs:
   * telephone-event
   * CN
+
+
+### React-Native (react-native-webrtc)
+
+* It does not support `track.close()` so we must not do it and must document it.
+  - Done. Doc missing.
+
+* In iOS, we must use a new stream `id` (in the `a=msid` line) for each new received `track`.

lib/Producer.js

@@ -43,9 +43,12 @@ export default class Producer extends EnhancedEventEmitter
 		// @type {MediaStreamTrack}
 		this._originalTrack = track;
 
-		// Track cloned from the original one.
+		// Track cloned from the original one (if supported).
 		// @type {MediaStreamTrack}
-		this._track = track.clone();
+		if (typeof track.clone === 'function')
+			this._track = track.clone();
+		else
+			this._track = track;
 
 		// App custom data.
 		// @type {Any}
@@ -455,7 +458,12 @@ export default class Producer extends EnhancedEventEmitter
 		else if (track.readyState === 'ended')
 			return Promise.reject(new Error('track.readyState is "ended"'));
 
-		const clonedTrack = track.clone();
+		let clonedTrack = track.clone();
+
+		if (typeof track.clone === 'function')
+			clonedTrack = track.clone();
+		else
+			clonedTrack = track;
 
 		return Promise.resolve()
 			.then(() =>