Class: MicLevelsAnalysis

See:

• mmir.env.media.WebspeechAudioInput for an example on integrating the mic-levels-analysis plugin into an audio-input plugin

Example

////////////////////////////////  within media plugin: load analyzer //////////////////////////////////
//within audio-input plugin that uses Web Audio: load mic-levels-analyzer plugin

//first: check, if the analyzer plugin is already loaded (should be loaded only once)
if(!mediaManager.micLevelsAnalysis){

	//set marker so that other plugins may know that the analyzer will be loaded:
	mediaManager.micLevelsAnalysis = true;

	//load the analyzer
	mediaManager.loadFile(micLevelsImplFile, function success(){

		//... finish the audio-plugin initialization, e.g. invoke initializer-callback

	}, function error(err){

	  	// ... in case the analyzer could not be loaded:
		// do some error handling ...

		//... and supply a stub-implementation for the analyzer module:
	  	mediaManager.micLevelsAnalysis = {
	  		_active: false,
	  		start: function(){
	  			console.info('STUB::micLevelsAnalysis.start()');
	  		},
	  		stop: function(){
	  			console.info('STUB::micLevelsAnalysis.stop()');
	  		},
	  		enable: function(enable){
	  			console.info('STUB::micLevelsAnalysis.enable('+(typeof enable === 'undefined'? '': enable)+') -> false');
	  			return false;//<- the stub can never be enabled
	  		},
	  		active: function(active){
	  			this._active = typeof active === 'undefined'? this._active: active;
	  			console.info('STUB::micLevelsAnalysis.active('+(typeof active === 'undefined'? '': active)+') -> ' + this._active);
	  			return active;//<- must always return the input-argument's value
	  		}
	  	};

	  	//... finish the audio-plugin initialization without the mic-levels-analyzer, e.g. invoke initializer-callback

	  });
} else {

	//if analyzer is already loaded/loading: just finish the audio-plugin initialization,
	//										 e.g. invoke initializer-callback

}


////////////////////////////////  use of mic-levels-analysis events //////////////////////////////////
//in application code: listen for mic-level-changes

mmir.MediaManager.on('miclevelchange', function(micValue){

});