audioutils.java

java处理声音文件

/*
 *	AudioUtils.java
 */

/*
 *  Copyright (c) 2000 by Matthias Pfisterer <[e-mail]>
 *
 *   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.
 *
 */


package	org.tritonus.sampled;


import	java.io.File;
import	java.io.FileOutputStream;
import	java.io.InputStream;
import	java.io.IOException;
import	java.io.OutputStream;
import	java.util.Collection;
import	java.util.Iterator;

import	javax.sound.sampled.AudioSystem;
import	javax.sound.sampled.AudioFormat;
import	javax.sound.sampled.AudioFileFormat;
import	javax.sound.sampled.AudioInputStream;
import	javax.sound.sampled.spi.AudioFileWriter;

import	org.tritonus.TDebug;
import	org.tritonus.sampled.TConversionTool;



public class AudioUtils
{
	public static long getLengthInBytes(AudioInputStream audioInputStream)
	{
		return getLengthInBytes(audioInputStream.getFormat(),
					audioInputStream.getFrameLength());
/*
		long	lLengthInFrames = audioInputStream.getFrameLength();
		int	nFrameSize = audioInputStream.getFormat().getFrameSize();
		if (lLengthInFrames >= 0 && nFrameSize >= 1)
		{
			return lLengthInFrames * nFrameSize;
		}
		else
		{
			return AudioSystem.NOT_SPECIFIED;
		}
*/
	}



	/**
	 *	if the passed value for lLength is
	 *	AudioSystem.NOT_SPECIFIED (unknown
	 *	length), the length in bytes becomes
	 *	AudioSystem.NOT_SPECIFIED, too.
	 */
	public static long getLengthInBytes(AudioFormat audioFormat,
					    long lLengthInFrames)
	{
		int	nFrameSize = audioFormat.getFrameSize();
		if (lLengthInFrames >= 0 && nFrameSize >= 1)
		{
			return lLengthInFrames * nFrameSize;
		}
		else
		{
			return AudioSystem.NOT_SPECIFIED;
		}
	}



	public static boolean containsFormat(AudioFormat sourceFormat,
					     Iterator possibleFormats)
	{
		while (possibleFormats.hasNext())
		{
			AudioFormat	format = (AudioFormat) possibleFormats.next();
			if (AudioFormats.matches(format, sourceFormat))
			{
				return true;
			}
		}
		return false;
	}

    //$$fb 2000-07-18: added these debugging functions
    public static String NS_or_number(int number) {
	return (number==AudioSystem.NOT_SPECIFIED)?"NOT_SPECIFIED":String.valueOf(number);
    }
    public static String NS_or_number(float number) {
	return (number==AudioSystem.NOT_SPECIFIED)?"NOT_SPECIFIED":String.valueOf(number);
    }

    /** 
     * For debugging purposes.
     */
    public static String format2ShortStr(AudioFormat format) {
	return format.getEncoding() + "-" +
	    NS_or_number(format.getChannels()) + "ch-" +
	    NS_or_number(format.getSampleSizeInBits()) + "bit-" +
	    NS_or_number(((int)format.getSampleRate())) + "Hz-"+
	    (format.isBigEndian() ? "be" : "le");
    } 

}



/*** AudioUtils.java ***/