/* * $ProjectName$ * $ProjectRevision$ * ----------------------------------------------------------- * $Id: VorbisStream.java,v 1.4 2003/04/10 19:49:04 jarnbjo Exp $ * ----------------------------------------------------------- * * $Author: jarnbjo $ * * Description: * * Copyright 2002-2003 Tor-Einar Jarnbjo * ----------------------------------------------------------- * * Change History * ----------------------------------------------------------- * $Log: VorbisStream.java,v $ * Revision 1.4 2003/04/10 19:49:04 jarnbjo * no message * * Revision 1.3 2003/03/31 00:20:16 jarnbjo * no message * * Revision 1.2 2003/03/16 01:11:12 jarnbjo * no message * * */ package de.jarnbjo.vorbis; import java.io.*; import java.util.*; import de.jarnbjo.ogg.*; import de.jarnbjo.util.io.*; /** */ public class VorbisStream { private LogicalOggStream oggStream; private IdentificationHeader identificationHeader; private CommentHeader commentHeader; private SetupHeader setupHeader; private AudioPacket lastAudioPacket, nextAudioPacket; private LinkedList audioPackets=new LinkedList(); private byte[] currentPcm; private int currentPcmIndex; private int currentPcmLimit; private static final int IDENTIFICATION_HEADER = 1; private static final int COMMENT_HEADER = 3; private static final int SETUP_HEADER = 5; private int bitIndex=0; private byte lastByte=(byte)0; private boolean initialized=false; private Object streamLock=new Object(); private int pageCounter=0; private int currentBitRate=0; private long currentGranulePosition; public static final int BIG_ENDIAN = 0; public static final int LITTLE_ENDIAN = 1; public VorbisStream() { } public VorbisStream(LogicalOggStream oggStream) throws VorbisFormatException, IOException { this.oggStream=oggStream; for(int i=0; i<3; i++) { BitInputStream source=new ByteArrayBitInputStream(oggStream.getNextOggPacket()); int headerType=source.getInt(8); switch(headerType) { case IDENTIFICATION_HEADER: identificationHeader=new IdentificationHeader(source); break; case COMMENT_HEADER: commentHeader=new CommentHeader(source); break; case SETUP_HEADER: setupHeader=new SetupHeader(this, source); break; } } if(identificationHeader==null) { throw new VorbisFormatException("The file has no identification header."); } if(commentHeader==null) { throw new VorbisFormatException("The file has no commentHeader."); } if(setupHeader==null) { throw new VorbisFormatException("The file has no setup header."); } //currentPcm=new int[identificationHeader.getChannels()][16384]; currentPcm=new byte[identificationHeader.getChannels()*identificationHeader.getBlockSize1()*2]; //new BufferThread().start(); } public IdentificationHeader getIdentificationHeader() { return identificationHeader; } public CommentHeader getCommentHeader() { return commentHeader; } protected SetupHeader getSetupHeader() { return setupHeader; } public boolean isOpen() { return oggStream.isOpen(); } public void close() throws IOException { oggStream.close(); } public int readPcm(byte[] buffer, int offset, int length) throws IOException { synchronized (streamLock) { final int channels=identificationHeader.getChannels(); if(lastAudioPacket==null) { lastAudioPacket=getNextAudioPacket(); } if(currentPcm==null || currentPcmIndex>=currentPcmLimit) { AudioPacket ap=getNextAudioPacket(); try { ap.getPcm(lastAudioPacket, currentPcm); currentPcmLimit=ap.getNumberOfSamples()*identificationHeader.getChannels()*2; } catch(ArrayIndexOutOfBoundsException e) { return 0; } currentPcmIndex=0; lastAudioPacket=ap; } int written=0; int i=0; int arrIx=0; for(i=currentPcmIndex; i<currentPcmLimit && arrIx<length; i++) { buffer[offset+arrIx++]=currentPcm[i]; written++; } currentPcmIndex=i; return written; } } private AudioPacket getNextAudioPacket() throws VorbisFormatException, IOException { pageCounter++; byte[] data=oggStream.getNextOggPacket(); AudioPacket res=null; while(res==null) { try { res=new AudioPacket(this, new ByteArrayBitInputStream(data)); } catch(ArrayIndexOutOfBoundsException e) { // ignore and continue with next packet } } currentGranulePosition+=res.getNumberOfSamples(); currentBitRate=data.length*8*identificationHeader.getSampleRate()/res.getNumberOfSamples(); return res; } public long getCurrentGranulePosition() { return currentGranulePosition; } public int getCurrentBitRate() { return currentBitRate; } public byte[] processPacket(byte[] packet) throws VorbisFormatException, IOException { if(packet.length==0) { throw new VorbisFormatException("Cannot decode a vorbis packet with length = 0"); } if(((int)packet[0]&1)==1) { // header packet BitInputStream source=new ByteArrayBitInputStream(packet); switch(source.getInt(8)) { case IDENTIFICATION_HEADER: identificationHeader=new IdentificationHeader(source); break; case COMMENT_HEADER: commentHeader=new CommentHeader(source); break; case SETUP_HEADER: setupHeader=new SetupHeader(this, source); break; } return null; } else { // audio packet if(identificationHeader==null || commentHeader==null || setupHeader==null) { throw new VorbisFormatException("Cannot decode audio packet before all three header packets have been decoded."); } AudioPacket ap=new AudioPacket(this, new ByteArrayBitInputStream(packet)); currentGranulePosition+=ap.getNumberOfSamples(); if(lastAudioPacket==null) { lastAudioPacket=ap; return null; } byte[] res=new byte[identificationHeader.getChannels()*ap.getNumberOfSamples()*2]; try { ap.getPcm(lastAudioPacket, res); } catch(IndexOutOfBoundsException e) { java.util.Arrays.fill(res, (byte)0); } lastAudioPacket=ap; return res; } } }