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/* JOrbis
* Copyright (C) 2000 ymnk, JCraft,Inc.
*
* Written by: 2000 ymnk<ymnk@jcraft.com>
*
* Many thanks to
* Monty <monty@xiph.org> and
* The XIPHOPHORUS Company http://www.xiph.org/ .
* JOrbis has been based on their awesome works, Vorbis codec.
*
* 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 com.jcraft.jorbis;
import com.jcraft.jogg.*;
public class Block{
///necessary stream state for linking to the framing abstraction
float[][] pcm=new float[0][]; // this is a pointer into local storage
Buffer opb=new Buffer();
int lW;
int W;
int nW;
int pcmend;
int mode;
int eofflag;
long granulepos;
long sequence;
DspState vd; // For read-only access of configuration
// local storage to avoid remallocing; it's up to the mapping to
// structure it
//byte[] localstore;
//int localtop;
//int localalloc;
//int totaluse;
//AllocChain reap;
// bitmetrics for the frame
int glue_bits;
int time_bits;
int floor_bits;
int res_bits;
public Block(DspState vd){
this.vd=vd;
// localalloc=0;
// localstore=null;
if(vd.analysisp!=0){
opb.writeinit();
}
}
public void init(DspState vd){
this.vd=vd;
}
// int alloc(int bytes){
// bytes=(bytes+(8-1))&(~(8-1));
// if(bytes+localtop>localalloc){
// if(localstore!=null){
// AllocChain link=new AllocChain();
// totaluse+=localtop;
// link.next=reap;
// link.ptr=localstore;
// reap=link;
// }
// // highly conservative
// localalloc=bytes;
// localstore=new byte[localalloc];
// localtop=0;
// }
// {
// int foo=localtop;
// //void *ret=(void *)(((char *)vb->localstore)+vb->localtop);
// localtop+=bytes;
// return foo;
// }
// }
// reap the chain, pull the ripcord
// void ripcord(){
// // reap the chain
// while(reap!=null){
// AllocChain next=reap.next;
// //free(reap->ptr);
// reap.ptr=null;
// //memset(reap,0,sizeof(struct alloc_chain));
// //free(reap);
// reap=next;
// }
// // consolidate storage
// if(totaluse!=0){
// //vb->localstore=realloc(vb->localstore,vb->totaluse+vb->localalloc);
// byte[] foo=new byte[totaluse+localalloc];
// System.arraycopy(localstore, 0, foo, 0, localstore.length);
// localstore=foo;
// localalloc+=totaluse;
// totaluse=0;
// }
// // pull the ripcord
// localtop=0;
// reap=null;
// }
public int clear(){
if(vd!=null){
if(vd.analysisp!=0){
opb.writeclear();
}
}
//ripcord();
//if(localstore!=null)
// localstore=null;
//memset(vb,0,sizeof(vorbis_block));
return(0);
}
public int synthesis(Packet op){
Info vi=vd.vi;
// first things first. Make sure decode is ready
// ripcord();
opb.readinit(op.packet_base, op.packet, op.bytes);
// Check the packet type
if(opb.read(1)!=0){
// Oops. This is not an audio data packet
return(-1);
}
// read our mode and pre/post windowsize
int _mode=opb.read(vd.modebits);
if(_mode==-1)return(-1);
mode=_mode;
W=vi.mode_param[mode].blockflag;
if(W!=0){
lW=opb.read(1);
nW=opb.read(1);
if(nW==-1) return(-1);
}
else{
lW=0;
nW=0;
}
// more setup
granulepos=op.granulepos;
sequence=op.packetno-3; // first block is third packet
eofflag=op.e_o_s;
// alloc pcm passback storage
pcmend=vi.blocksizes[W];
//pcm=alloc(vi.channels);
if(pcm.length<vi.channels){
pcm=new float[vi.channels][];
}
for(int i=0;i<vi.channels;i++){
if(pcm[i]==null || pcm[i].length<pcmend){
pcm[i]=new float[pcmend];
//pcm[i]=alloc(pcmend);
}
else{
for(int j=0;j<pcmend;j++){ pcm[i][j]=0; }
}
}
// unpack_header enforces range checking
int type=vi.map_type[vi.mode_param[mode].mapping];
return(FuncMapping.mapping_P[type].inverse(this, vd.mode[mode]));
}
}
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