import org.tritonus.share.sampled.TAudioFormat; //导入依赖的package包/类
/**
 * Determines Properties when the File/URL/InputStream is opened.
 */
private void determineProperties() {
	logger.info("Entered determineProperties()!\n");
	
	// Add AudioFileFormat properties.
	// Expect if it is null(something bad happened).
	if (audioFileFormat == null)
		return;
	
	if (! ( audioFileFormat instanceof TAudioFileFormat ))
		audioProperties = new HashMap<>();
	else {
		// Tritonus SPI compliant audio file format.
		audioProperties = ( (TAudioFileFormat) audioFileFormat ).properties();
		
		// Clone the Map because it is not mutable.
		audioProperties = deepCopy(audioProperties);
		
	}
	
	// Add JavaSound properties.
	if (audioFileFormat.getByteLength() > 0)
		audioProperties.put("audio.length.bytes", audioFileFormat.getByteLength());
	if (audioFileFormat.getFrameLength() > 0)
		audioProperties.put("audio.length.frames", audioFileFormat.getFrameLength());
	if (audioFileFormat.getType() != null)
		audioProperties.put("audio.type", audioFileFormat.getType());
	
	// AudioFormat properties.
	AudioFormat audioFormat = audioFileFormat.getFormat();
	if (audioFormat.getFrameRate() > 0)
		audioProperties.put("audio.framerate.fps", audioFormat.getFrameRate());
	if (audioFormat.getFrameSize() > 0)
		audioProperties.put("audio.framesize.bytes", audioFormat.getFrameSize());
	if (audioFormat.getSampleRate() > 0)
		audioProperties.put("audio.samplerate.hz", audioFormat.getSampleRate());
	if (audioFormat.getSampleSizeInBits() > 0)
		audioProperties.put("audio.samplesize.bits", audioFormat.getSampleSizeInBits());
	if (audioFormat.getChannels() > 0)
		audioProperties.put("audio.channels", audioFormat.getChannels());
	// Tritonus SPI compliant audio format.
	if (audioFormat instanceof TAudioFormat)
		audioProperties.putAll( ( (TAudioFormat) audioFormat ).properties());
	
	// Add SourceDataLine
	audioProperties.put("basicplayer.sourcedataline", sourceDataLine);
	
	// Keep this final reference for the lambda expression
	final Map<String,Object> audioPropertiesCopy = audioProperties;
	
	// Notify all registered StreamPlayerListeners
	listeners.forEach(listener -> listener.opened(dataSource, audioPropertiesCopy));
	
	logger.info("Exited determineProperties()!\n");
	
}