Class: MediaPlaybackController

This method is called when the server fires the controller receives a message with the address /eim/status/emotionIndex. When this occurs, TrialData is updated with the received emotion index, $scope#buttonDisabled is set to false, and the slide is advanced by calling ExperimentManager#advanceSlide.

This method is called when the server fires the controller receives a message with the address /eim/status/playback. When this occurs, if the message indicates that playback has begun, the page is blacked out. If the message indicates that playback has ended, the blackout is removed, the emotion index is requested, $scope#currentButtonLabel is set to 'Continue', $scope#mediaHasPlayed is set to true, and $scope#buttonDisabled is set to true.

Requests the most recently recorded emotion index from the server over OSC. The message used to retrieve this value is like the following:

{
    oscType: 'message',
    address: '/eim/control/emotionIndex',
    args: [
        {
            type: 'string',
            value: <SESSIONNUMBER>
        }
    ]
}