Cdparanoia.java

/*
 *	Cdparanoia.java
 *
 *	This file is part of Tritonus: http://www.tritonus.org/
 */

/*
 *  Copyright (c) 2001 by Matthias Pfisterer
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Library General Public License as published
 *   by the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU Library General Public License for more details.
 *
 *   You should have received a copy of the GNU Library General Public
 *   License along with this program; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

/*
|<---            this code is formatted to fit into 80 columns             --->|
*/

package org.tritonus.lowlevel.cdda.cdparanoia;

import org.tritonus.share.TDebug;



/**	Reading audio CDs using libcdparanoia.
 */
public class Cdparanoia
{
	static
	{
		if (TDebug.TraceCdda) { TDebug.out("Cdparanoia.<clinit>(): loading native library tritonuscdparanoia"); }
		System.loadLibrary("tritonuscdparanoia");
		if (TDebug.TraceCdda) { TDebug.out("Cdparanoia.<clinit>(): loaded"); }
		setTrace(TDebug.TraceCddaNative);

		if (Boolean.getBoolean("tritonus.DisableParanoia"))
		{
			setParanoiaMode(false);
		}
	}



	/*
	 *	This holds a pointer for the native code -
	 *	do not touch!
	 */
	@SuppressWarnings("unused")
	private long		m_lNativeHandle;



	public Cdparanoia(String strDevice)
	{
		if (TDebug.TraceCdda) { TDebug.out("Cdparanoia.<init>: begin"); }
		int	nResult = open(strDevice);
		if (nResult < 0)
		{
			throw new RuntimeException("cannot open device '" + strDevice + "'");
		}
		if (TDebug.TraceCdda) { TDebug.out("Cdparanoia.<init>: end"); }
	}



	/**	Searches the device.
		Calls cdda_identify().

		@return 0 on success, negative values on error.
	*/
	private native int find(String strDevice);

	/**	Opens and initializes the device.
		Calls cdda_open(), paranoia_init()
		and paranoia_modeset().

		@return 0 on success, negative values on error.
	*/
	private native int open(String strDevice);

	/**	Closes the device.
	 *	Calls cdda_close().
	 */
	public native void close();


	/*	Read the table of contents.
		anValues[0]	first track
		anValues[1]	last track

		anStartTrack[x]	start sector of the track x.
		anType[x]	type of track x.
	*/
	public native int readTOC(int[] anValues,
			   int[] anStartFrame,
			   int[] anLength,
			   int[] anType,
			   boolean[] abAudio,
			   boolean[] abCopy,
			   boolean[] abPre,
			   int[] anChannels);



	public native int prepareTrack(int nTrack);


	/**	Reads one or more raw frames from the CD.
		This call reads <CODE>nCount</CODE> frames from
		the track that has been set by
		<CODE>prepareTrack()</CODE>.
		<CODE>abData</CODE>  has to be big enough to hold the
		amount of data requested (<CODE>2352 * nCount</CODE> bytes).
	 */
	public native int readNextFrame(int nCount, byte[] abData);


	private static native void setTrace(boolean bTrace);


	/** Set the paranoia level.
	    This setting influences the value that is used in the call
	    'paranoia_modeset(cdrom_paranoia*, int [mode])'.
	    If set to true a hard-coded default value will be used.
	    (Currently 'PARANOIA_MODE_FULL ^ PARANOIA_MODE_NEVERSKIP', but
	    for definitive answers, look it up in src/lib/cdparanoia/org_tritonus_lowlevel_cdda_cdparanoia_Cdparanoia.c).
	    If set to false, 'PARANOIA_MODE_DISABLE' will be used.
	    Note that currently, changing this value only has an effect prior
	    to opening the device.
	*/
	private static native void setParanoiaMode(boolean bPoranoiaMode);
}



/*** Cdparanoia.java ***/