Multi-track selection

<OTVPlayer ref={otvplayer => this.otvplayer.ref = otvplayer}
	…
	onTracksChanged={_onTracksChanged}
	onTextTrackSelected={_onTextTrackSelected}
	onAudioTrackSelected={_onAudioTrackSelected}
	…	
>
</OTVPlayer>

…

_setAudioTrack(index) {
	// Something like this should be called when a user selects a new track through your UI
	this.otvplayer.ref.selectAudioTrack(index);
}

_setVideoTrack(index) {
	// Something like this should be called when a user selects a new track through your UI
	this.otvplayer.ref.selectVideoTrack(index);
}

_onTracksChanged(data = {}) {
	// This callback is triggered when new tracks are discovered, eg. when a stream has loaded
	// It allows access to the various parts of track information. See the API for more info
	let state = this.state;
	
	// You will need to retain this information in order to correctly select a new track later on
	// The parameter for each of the select[Audio|Video]Tracks methods is relative to these arrays
	state.audioTracks = data.audioTracks;
	state.textTracks = data.textTracks;

	console.log('selected audio track index:' + data.selectedAudioTrack.index);

	this.setState(state);
}

_onTextTrackSelected(data = {}) {
	// This is triggered when a new text track has been selected
	let state = this.state;

	var textTrackFound = false;
	for (track in state.textTracks) {
		if (state.textTracks[track].index == data.index) {
			console.log('selected textTrack track index:' + data.index);
			state.selectedTextTrack = state.textTracks[track];
			textTrackFound = true;
		}
	}

	if (!textTrackFound) {
		console.log('No selected text found. Selecting No Subtitles.');
	}

	this.setState(state);
}


_onAudioTrackSelected(data = {}) {
	// This is triggered when a new audio track has been selected
	console.log('onAudioTrackSelected');
	let state = this.state;

	console.log('selected audio track index:' + data.index);

	var audioTrackFound = false;
	for (track in state.audioTracks) {
		if (state.audioTracks[track].index == data.index) {
			state.selectedAudioTrack = state.audioTracks[track];
			audioTrackFound = true;
		}
	}

	if (!audioTrackFound) {
		console.log('No selected audio track. Should always be one');
	}

	this.setState(state);
}