9fee0ec4ca
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7101 a1c6a512-1295-4272-9138-f99709370657
352 lines
8.8 KiB
Java
352 lines
8.8 KiB
Java
/* JOrbis
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* Copyright (C) 2000 ymnk, JCraft,Inc.
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*
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* Written by: 2000 ymnk<ymnk@jcraft.com>
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*
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* Many thanks to
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* Monty <monty@xiph.org> and
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* The XIPHOPHORUS Company http://www.xiph.org/ .
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* JOrbis has been based on their awesome works, Vorbis codec.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public License
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* as published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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package com.jcraft.jorbis;
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import com.jcraft.jogg.*;
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class Floor0 extends FuncFloor{
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void pack(Object i, Buffer opb){
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InfoFloor0 info=(InfoFloor0)i;
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opb.write(info.order,8);
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opb.write(info.rate,16);
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opb.write(info.barkmap,16);
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opb.write(info.ampbits,6);
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opb.write(info.ampdB,8);
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opb.write(info.numbooks-1,4);
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for(int j=0;j<info.numbooks;j++)
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opb.write(info.books[j],8);
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}
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Object unpack(Info vi , Buffer opb){
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InfoFloor0 info=new InfoFloor0();
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info.order=opb.read(8);
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info.rate=opb.read(16);
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info.barkmap=opb.read(16);
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info.ampbits=opb.read(6);
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info.ampdB=opb.read(8);
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info.numbooks=opb.read(4)+1;
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if((info.order<1)||
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(info.rate<1)||
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(info.barkmap<1)||
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(info.numbooks<1)){
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//free_info(info);
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return(null);
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}
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for(int j=0;j<info.numbooks;j++){
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info.books[j]=opb.read(8);
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if(info.books[j]<0 || info.books[j]>=vi.books){
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//free_info(info);
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return(null);
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}
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}
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return(info);
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// err_out:
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// free_info(info);
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// return(NULL);
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}
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Object look(DspState vd, InfoMode mi, Object i){
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float scale;
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Info vi=vd.vi;
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InfoFloor0 info=(InfoFloor0)i;
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LookFloor0 look=new LookFloor0();
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look.m=info.order;
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look.n=vi.blocksizes[mi.blockflag]/2;
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look.ln=info.barkmap;
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look.vi=info;
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look.lpclook.init(look.ln,look.m);
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// we choose a scaling constant so that:
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// floor(bark(rate/2-1)*C)=mapped-1
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// floor(bark(rate/2)*C)=mapped
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scale=look.ln/toBARK((float)(info.rate/2.));
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// the mapping from a linear scale to a smaller bark scale is
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// straightforward. We do *not* make sure that the linear mapping
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// does not skip bark-scale bins; the decoder simply skips them and
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// the encoder may do what it wishes in filling them. They're
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// necessary in some mapping combinations to keep the scale spacing
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// accurate
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look.linearmap=new int[look.n];
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for(int j=0;j<look.n;j++){
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int val=(int)Math.floor(toBARK((float)((info.rate/2.)/look.n*j))
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*scale); // bark numbers represent band edges
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if(val>=look.ln)val=look.ln; // guard against the approximation
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look.linearmap[j]=val;
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}
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return look;
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}
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static float toBARK(float f){
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return (float)(13.1*Math.atan(.00074*(f))+2.24*Math.atan((f)*(f)*1.85e-8)+1e-4*(f));
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}
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Object state(Object i){
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EchstateFloor0 state=new EchstateFloor0();
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InfoFloor0 info=(InfoFloor0)i;
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// a safe size if usually too big (dim==1)
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state.codewords=new int[info.order];
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state.curve=new float[info.barkmap];
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state.frameno=-1;
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return(state);
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}
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void free_info(Object i){}
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void free_look(Object i){}
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void free_state(Object vs){}
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int forward(Block vb, Object i, float[] in, float[] out, Object vs){return 0;}
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float[] lsp=null;
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int inverse(Block vb, Object i, float[] out){
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//System.err.println("Floor0.inverse "+i.getClass()+"]");
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LookFloor0 look=(LookFloor0)i;
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InfoFloor0 info=look.vi;
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int ampraw=vb.opb.read(info.ampbits);
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if(ampraw>0){ // also handles the -1 out of data case
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int maxval=(1<<info.ampbits)-1;
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float amp=(float)ampraw/maxval*info.ampdB;
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int booknum=vb.opb.read(ilog(info.numbooks));
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if(booknum!=-1 && booknum<info.numbooks){
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synchronized(this){
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if(lsp==null||lsp.length<look.m){
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lsp=new float[look.m];
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}
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else{
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for(int j=0; j<look.m; j++)lsp[j]=0.f;
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}
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CodeBook b=vb.vd.fullbooks[info.books[booknum]];
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float last=0.f;
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//memset(out,0,sizeof(float)*look->m);
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for(int j=0; j<look.m; j++)out[j]=0.0f;
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for(int j=0;j<look.m;j+=b.dim){
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if(b.decodevs(lsp, j, vb.opb, 1, -1)==-1){
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//goto eop;
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// memset(out,0,sizeof(float)*look->n);
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for(int k=0; k<look.n; k++)out[k]=0.0f;
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return(0);
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}
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}
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for(int j=0;j<look.m;){
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for(int k=0;k<b.dim;k++,j++)lsp[j]+=last;
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last=lsp[j-1];
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}
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// take the coefficients back to a spectral envelope curve
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/*
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lsp_to_lpc(out,out,look.m);
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lpc_to_curve(out,out,amp,look,"",0);
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for(int j=0;j<look.n;j++){
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out[j]=fromdB(out[j]-info.ampdB);
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}
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*/
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Lsp.lsp_to_curve(out,look.linearmap,look.n,look.ln,
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lsp,look.m,amp,info.ampdB);
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return(1);
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}
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}
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}
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// eop:
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// memset(out,0,sizeof(float)*look->n);
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return(0);
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}
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Object inverse1(Block vb, Object i, Object memo){
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//System.err.println("Floor0.inverse "+i.getClass()+"]");
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LookFloor0 look=(LookFloor0)i;
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InfoFloor0 info=look.vi;
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float[] lsp=null;
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if(memo instanceof float[]){
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lsp=(float[])memo;
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}
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int ampraw=vb.opb.read(info.ampbits);
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if(ampraw>0){ // also handles the -1 out of data case
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int maxval=(1<<info.ampbits)-1;
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float amp=(float)ampraw/maxval*info.ampdB;
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int booknum=vb.opb.read(ilog(info.numbooks));
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if(booknum!=-1 && booknum<info.numbooks){
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CodeBook b=vb.vd.fullbooks[info.books[booknum]];
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float last=0.f;
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if(lsp==null||lsp.length<look.m+1){
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lsp=new float[look.m+1];
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}
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else{
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for(int j=0; j<lsp.length; j++)lsp[j]=0.f;
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}
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for(int j=0;j<look.m;j+=b.dim){
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if(b.decodev_set(lsp, j, vb.opb, b.dim)==-1){
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//goto eop;
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return(null);
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}
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}
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for(int j=0;j<look.m;){
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for(int k=0;k<b.dim;k++,j++)lsp[j]+=last;
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last=lsp[j-1];
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}
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lsp[look.m]=amp;
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return(lsp);
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}
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}
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// eop:
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return(null);
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}
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int inverse2(Block vb, Object i, Object memo, float[] out){
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//System.err.println("Floor0.inverse "+i.getClass()+"]");
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LookFloor0 look=(LookFloor0)i;
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InfoFloor0 info=look.vi;
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if(memo!=null){
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float[] lsp=(float[])memo;
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float amp=lsp[look.m];
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Lsp.lsp_to_curve(out,look.linearmap,look.n,look.ln,
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lsp,look.m,amp,info.ampdB);
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return(1);
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}
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// eop:
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// memset(out,0,sizeof(float)*look->n);
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for(int j=0; j<look.n; j++){
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out[j]=0.f;
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}
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return(0);
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}
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static float fromdB(float x){
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return (float)(Math.exp((x)*.11512925));
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}
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private static int ilog(int v){
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int ret=0;
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while(v!=0){
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ret++;
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v>>>=1;
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}
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return(ret);
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}
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static void lsp_to_lpc(float[] lsp, float[] lpc, int m){
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int i,j,m2=m/2;
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float[] O=new float[m2];
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float[] E=new float[m2];
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float A;
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float[] Ae=new float[m2+1];
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float[] Ao=new float[m2+1];
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float B;
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float[] Be=new float[m2];
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float[] Bo=new float[m2];
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float temp;
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// even/odd roots setup
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for(i=0;i<m2;i++){
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O[i]=(float)(-2.*Math.cos(lsp[i*2]));
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E[i]=(float)(-2.*Math.cos(lsp[i*2+1]));
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}
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// set up impulse response
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for(j=0;j<m2;j++){
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Ae[j]=0.f;
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Ao[j]=1.f;
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Be[j]=0.f;
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Bo[j]=1.f;
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}
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Ao[j]=1.f;
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Ae[j]=1.f;
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// run impulse response
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for(i=1;i<m+1;i++){
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A=B=0.f;
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for(j=0;j<m2;j++){
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temp=O[j]*Ao[j]+Ae[j];
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Ae[j]=Ao[j];
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Ao[j]=A;
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A+=temp;
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temp=E[j]*Bo[j]+Be[j];
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Be[j]=Bo[j];
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Bo[j]=B;
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B+=temp;
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}
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lpc[i-1]=(A+Ao[j]+B-Ae[j])/2;
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Ao[j]=A;
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Ae[j]=B;
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}
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}
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static void lpc_to_curve(float[] curve, float[] lpc,float amp,
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LookFloor0 l, String name, int frameno){
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// l->m+1 must be less than l->ln, but guard in case we get a bad stream
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float[] lcurve=new float[Math.max(l.ln*2,l.m*2+2)];
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if(amp==0){
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//memset(curve,0,sizeof(float)*l->n);
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for(int j=0; j<l.n; j++)curve[j]=0.0f;
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return;
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}
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l.lpclook.lpc_to_curve(lcurve,lpc,amp);
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for(int i=0;i<l.n;i++)curve[i]=lcurve[l.linearmap[i]];
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}
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}
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class InfoFloor0{
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int order;
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int rate;
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int barkmap;
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int ampbits;
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int ampdB;
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int numbooks; // <= 16
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int[] books=new int[16];
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}
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class LookFloor0{
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int n;
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int ln;
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int m;
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int[] linearmap;
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InfoFloor0 vi;
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Lpc lpclook=new Lpc();
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}
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class EchstateFloor0{
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int[] codewords;
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float[] curve;
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long frameno;
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long codes;
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}
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