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/*
* $ProjectName$
* $ProjectRevision$
* -----------------------------------------------------------
* $Id$
* -----------------------------------------------------------
*
* $Author$
*
* Description:
*
* Copyright 2002-2003 Tor-Einar Jarnbjo
* -----------------------------------------------------------
*
* Change History
* -----------------------------------------------------------
* $Log$
* Revision 1.1 2005/07/11 15:42:36 hcl
* Songdb java version, source. only 1.5 compatible
*
* Revision 1.1.1.1 2004/04/04 22:09:12 shred
* First Import
*
* Revision 1.1 2003/04/10 19:48:22 jarnbjo
* no message
*
*
*/
package de.jarnbjo.ogg;
import java.io.*;
import java.util.*;
/**
* Implementation of the <code>PhysicalOggStream</code> interface for accessing
* normal disk files.
*/
public class FileStream implements PhysicalOggStream {
private boolean closed=false;
private RandomAccessFile source;
private long[] pageOffsets;
private long numberOfSamples=-1;
private HashMap logicalStreams=new HashMap();
/**
* Creates access to the specified file through the <code>PhysicalOggStream</code> interface.
* The specified source file must have been opened for reading.
*
* @param source the file to read from
*
* @throws OggFormatException if the stream format is incorrect
* @throws IOException if some other IO error occurs when reading the file
*/
public FileStream(RandomAccessFile source) throws OggFormatException, IOException {
this.source=source;
ArrayList po=new ArrayList();
int pageNumber=0;
try {
while(true) {
po.add(new Long(this.source.getFilePointer()));
// skip data if pageNumber>0
OggPage op=getNextPage(pageNumber>0);
if(op==null) {
break;
}
LogicalOggStreamImpl los=(LogicalOggStreamImpl)getLogicalStream(op.getStreamSerialNumber());
if(los==null) {
los=new LogicalOggStreamImpl(this, op.getStreamSerialNumber());
logicalStreams.put(new Integer(op.getStreamSerialNumber()), los);
}
if(pageNumber==0) {
los.checkFormat(op);
}
los.addPageNumberMapping(pageNumber);
los.addGranulePosition(op.getAbsoluteGranulePosition());
if(pageNumber>0) {
this.source.seek(this.source.getFilePointer()+op.getTotalLength());
}
pageNumber++;
}
}
catch(EndOfOggStreamException e) {
// ok
}
catch(IOException e) {
throw e;
}
//System.out.println("pageNumber: "+pageNumber);
this.source.seek(0L);
pageOffsets=new long[po.size()];
int i=0;
Iterator iter=po.iterator();
while(iter.hasNext()) {
pageOffsets[i++]=((Long)iter.next()).longValue();
}
}
public Collection getLogicalStreams() {
return logicalStreams.values();
}
public boolean isOpen() {
return !closed;
}
public void close() throws IOException {
closed=true;
source.close();
}
private OggPage getNextPage() throws EndOfOggStreamException, IOException, OggFormatException {
return getNextPage(false);
}
private OggPage getNextPage(boolean skipData) throws EndOfOggStreamException, IOException, OggFormatException {
return OggPage.create(source, skipData);
}
public OggPage getOggPage(int index) throws IOException {
source.seek(pageOffsets[index]);
return OggPage.create(source);
}
private LogicalOggStream getLogicalStream(int serialNumber) {
return (LogicalOggStream)logicalStreams.get(new Integer(serialNumber));
}
public void setTime(long granulePosition) throws IOException {
for(Iterator iter=logicalStreams.values().iterator(); iter.hasNext(); ) {
LogicalOggStream los=(LogicalOggStream)iter.next();
los.setTime(granulePosition);
}
}
/**
* @return always <code>true</code>
*/
public boolean isSeekable() {
return true;
}
}
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