/*
* Entagged Audio Tag library
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package entagged.audioformats.mp3.util;
/**
* Creates a representation of a Lame Mpeg frame $Id: LameMPEGFrame.java,v 1.3 2005/05/19 16:00:15 kikidonk Exp $
*
* @author Rapha�l Slinckx (KiKiDonK)
* @version v0.03
*/
public class LameMPEGFrame {
/** contains the Bitrate of this frame */
private int bitrate;
/** Flag indicating if bitset contains a Lame Frame */
private boolean containsLameMPEGFrame;
/** Contains the Filesize in bytes of the frame's File */
private int fileSize;
/** Flag indicating if this is a correct Lame Frame */
private boolean isValidLameMPEGFrame = false;
/** Contains the Lame Version number of this frame */
private String lameVersion;
/** Contains the bitset representing this Lame Frame */
private boolean containsLameFrame = false;
/**
* Creates a Lame Mpeg Frame and checks it's integrity
*
* @param lameHeader a byte array representing the Lame frame
*/
public LameMPEGFrame( byte[] lameHeader ) {
String xing = new String( lameHeader, 0, 4 );
if ( xing.equals( "LAME" ) ) {
isValidLameMPEGFrame = true;
int[] b = u( lameHeader );
containsLameFrame = ( (b[9]&0xFF) == 0xFF );
byte[] version = new byte[5];
version[0] = lameHeader[4];
version[1] = lameHeader[5];
version[2] = lameHeader[6];
version[3] = lameHeader[7];
version[4] = lameHeader[8];
lameVersion = new String( version );
containsLameMPEGFrame = containsLameMPEGFrame();
if ( containsLameMPEGFrame ) {
bitrate = b[20];
fileSize = b[28] * 16777215 + b[29] * 65535 + b[30] * 255 + b[31];
}
}
else
//Pas de frame VBR MP3 Lame
isValidLameMPEGFrame = false;
}
private int[] u(byte[] b) {
int[] i = new int[b.length];
for(int j = 0; j<i.length; j++)
i[j] = b[j] & 0xFF;
return i;
}
/**
* Gets the valid attribute of the LameMPEGFrame object
*
* @return The valid value
*/
public boolean isValid() {
return isValidLameMPEGFrame;
}
/**
* Create a string representation of this frame
*
* @return the string representation of this Lame Frame
*/
public String toString() {
String output;
if ( isValidLameMPEGFrame ) {
output = "\n----LameMPEGFrame--------------------\n";
output += "Lame" + lameVersion;
if ( containsLameMPEGFrame )
output += "\tMin.Bitrate:" + bitrate + "\tLength:" + fileSize;
output += "\n--------------------------------\n";
}
else
output = "\n!!!No Valid Lame MPEG Frame!!!\n";
return output;
}
/**
* Checks wether this frame is a Lame Frame or Not
*
* @return true if this frame contains a Lame Frame
*/
private boolean containsLameMPEGFrame() {
return containsLameFrame;
}
}