/*
* Entagged Audio Tag library
* Copyright (c) 2003-2005 Raphaël Slinckx <raphael@slinckx.net>
*
* 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 org.jaudiotagger.audio.ogg;
import org.jaudiotagger.audio.exceptions.CannotReadException;
import org.jaudiotagger.audio.generic.AudioFileReader;
import org.jaudiotagger.audio.generic.GenericAudioHeader;
import org.jaudiotagger.audio.ogg.util.OggInfoReader;
import org.jaudiotagger.audio.ogg.util.OggPageHeader;
import org.jaudiotagger.tag.Tag;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.logging.Logger;
/**
* Read Ogg File Tag and Encoding information
* <p/>
* Only implemented for ogg files containing a vorbis stream with vorbis comments
*/
public class OggFileReader extends AudioFileReader {
// Logger Object
public static Logger logger = Logger.getLogger("org.jaudiotagger.audio.ogg");
private OggInfoReader ir;
private OggVorbisTagReader vtr;
public OggFileReader() {
ir = new OggInfoReader();
vtr = new OggVorbisTagReader();
}
protected GenericAudioHeader getEncodingInfo(RandomAccessFile raf) throws CannotReadException, IOException {
return ir.read(raf);
}
protected Tag getTag(RandomAccessFile raf) throws CannotReadException, IOException {
return vtr.read(raf);
}
/**
* Return count Ogg Page header, count starts from zero
* <p/>
* count=0; should return PageHeader that contains Vorbis Identification Header
* count=1; should return Pageheader that contains VorbisComment and possibly SetupHeader
* count>=2; should return PageHeader containing remaining VorbisComment,SetupHeader and/or Audio
*
* @param raf
* @param count
* @return
* @throws CannotReadException
* @throws IOException
*/
public OggPageHeader readOggPageHeader(RandomAccessFile raf, int count) throws CannotReadException, IOException {
OggPageHeader pageHeader = OggPageHeader.read(raf);
while (count > 0) {
raf.seek(raf.getFilePointer() + pageHeader.getPageLength());
pageHeader = OggPageHeader.read(raf);
count--;
}
return pageHeader;
}
/**
* Summarize all the ogg headers in a file
* <p/>
* A useful utility function
*
* @param oggFile
* @throws CannotReadException
* @throws IOException
*/
public void summarizeOggPageHeaders(File oggFile) throws CannotReadException, IOException {
RandomAccessFile raf = new RandomAccessFile(oggFile, "r");
while (raf.getFilePointer() < raf.length()) {
System.out.println("pageHeader starts at absolute file position:" + raf.getFilePointer());
OggPageHeader pageHeader = OggPageHeader.read(raf);
System.out.println("pageHeader finishes at absolute file position:" + raf.getFilePointer());
System.out.println(pageHeader + "\n");
raf.seek(raf.getFilePointer() + pageHeader.getPageLength());
}
System.out.println("Raf File Pointer at:" + raf.getFilePointer() + "File Size is:" + raf.length());
raf.close();
}
/**
* Summarizes the first five pages, normally all we are interested in
*
* @param oggFile
* @throws CannotReadException
* @throws IOException
*/
public void shortSummarizeOggPageHeaders(File oggFile) throws CannotReadException, IOException {
RandomAccessFile raf = new RandomAccessFile(oggFile, "r");
int i = 0;
while (raf.getFilePointer() < raf.length()) {
System.out.println("pageHeader starts at absolute file position:" + raf.getFilePointer());
OggPageHeader pageHeader = OggPageHeader.read(raf);
System.out.println("pageHeader finishes at absolute file position:" + raf.getFilePointer());
System.out.println(pageHeader + "\n");
raf.seek(raf.getFilePointer() + pageHeader.getPageLength());
i++;
if (i >= 5) {
break;
}
}
System.out.println("Raf File Pointer at:" + raf.getFilePointer() + "File Size is:" + raf.length());
raf.close();
}
}