!7

// Source: AudioLoop from jsresources.org

import javax.sound.sampled.*;

static boolean	DEBUG;
static int	DEFAULT_INTERNAL_BUFSIZ = 40960;
static int	DEFAULT_EXTERNAL_BUFSIZ = 40960;

p {
	S strMixerName = null;
	float	fFrameRate = 44100.0F;
	int	nInternalBufferSize = DEFAULT_INTERNAL_BUFSIZ;
	int	nExternalBufferSize = DEFAULT_EXTERNAL_BUFSIZ;

	AudioFormat	audioFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, fFrameRate, 16, 2, 4, fFrameRate, false);
	if (DEBUG) { print("AudioLoop.main(): audio format: " + audioFormat); }
	new AudioLoop(audioFormat, nInternalBufferSize, nExternalBufferSize, strMixerName).start();
}

sclass AudioLoop extends Thread {
	TargetDataLine	m_targetLine;
	SourceDataLine	m_sourceLine;
	boolean		m_bRecording;
	int		m_nExternalBufferSize;

	*(AudioFormat format,
		 int nInternalBufferSize,
		 int nExternalBufferSize,
		 String strMixerName) throws LineUnavailableException {
		Mixer		mixer = null;
		if (strMixerName != null) {
			Mixer.Info	mixerInfo = javaSound_getMixerInfo(strMixerName);
			if (DEBUG) { print("AudioLoop.<init>(): mixer info: " + mixerInfo); }
			mixer = AudioSystem.getMixer(mixerInfo);
			if (DEBUG) { print("AudioLoop.<init>(): mixer: " + mixer); }
		}
		
		DataLine.Info	targetInfo = new DataLine.Info(TargetDataLine.class, format, nInternalBufferSize);
		DataLine.Info	sourceInfo = new DataLine.Info(SourceDataLine.class, format, nInternalBufferSize);
		if (mixer != null)
		{
			m_targetLine = (TargetDataLine) mixer.getLine(targetInfo);
			m_sourceLine = (SourceDataLine) mixer.getLine(sourceInfo);
		}
		else
		{
			m_targetLine = (TargetDataLine) AudioSystem.getLine(targetInfo);
			m_sourceLine = (SourceDataLine) AudioSystem.getLine(sourceInfo);
		}
		if (DEBUG) { print("AudioLoop.<init>(): SourceDataLine: " + m_sourceLine); }
		if (DEBUG) { print("AudioLoop.<init>(): TargetDataLine: " + m_targetLine); }
		m_targetLine.open(format, nInternalBufferSize);
		m_sourceLine.open(format, nInternalBufferSize);
		m_nExternalBufferSize = nExternalBufferSize;
	}

	public void start() {
		m_targetLine.start();
		m_sourceLine.start();
		super.start();
	}

	public void run() {
		byte[]	abBuffer = new byte[m_nExternalBufferSize];
		int	nBufferSize = abBuffer.length;
		m_bRecording = true;
		while (m_bRecording) {
			if (DEBUG) { print("Trying to read: " + nBufferSize); }
			/*
			 *	read a block of data from the recording line.
			 */
			int	nBytesRead = m_targetLine.read(abBuffer, 0, nBufferSize);
			if (DEBUG) { print("Read: " + nBytesRead); }
			/*
			 *	And now, we write the block to the playback
			 *	line.
			 */
			m_sourceLine.write(abBuffer, 0, nBytesRead);
		}
	}
}