224 lines
6.5 KiB
C
224 lines
6.5 KiB
C
/********************************************************************
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* *
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* THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
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* by the XIPHOPHORUS Company http://www.xiph.org/ *
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* *
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********************************************************************
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function: floor backend 0 implementation
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last mod: $Id: floor0.c 3 2005-06-02 18:16:43Z vspader $
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********************************************************************/
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include <ogg/ogg.h>
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#include "vorbis/codec.h"
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#include "codec_internal.h"
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#include "registry.h"
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#include "lpc.h"
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#include "lsp.h"
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#include "codebook.h"
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#include "scales.h"
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#include "misc.h"
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#include "os.h"
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#include "misc.h"
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#include <stdio.h>
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typedef struct {
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int ln;
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int m;
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int **linearmap;
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int n[2];
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vorbis_info_floor0 *vi;
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long bits;
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long frames;
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} vorbis_look_floor0;
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/***********************************************/
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static void floor0_free_info(vorbis_info_floor *i){
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vorbis_info_floor0 *info=(vorbis_info_floor0 *)i;
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if(info){
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memset(info,0,sizeof(*info));
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_ogg_free(info);
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}
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}
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static void floor0_free_look(vorbis_look_floor *i){
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vorbis_look_floor0 *look=(vorbis_look_floor0 *)i;
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if(look){
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if(look->linearmap){
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if(look->linearmap[0])_ogg_free(look->linearmap[0]);
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if(look->linearmap[1])_ogg_free(look->linearmap[1]);
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_ogg_free(look->linearmap);
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}
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memset(look,0,sizeof(*look));
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_ogg_free(look);
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}
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}
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static vorbis_info_floor *floor0_unpack (vorbis_info *vi,oggpack_buffer *opb){
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codec_setup_info *ci=vi->codec_setup;
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int j;
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vorbis_info_floor0 *info=_ogg_malloc(sizeof(*info));
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info->order=oggpack_read(opb,8);
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info->rate=oggpack_read(opb,16);
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info->barkmap=oggpack_read(opb,16);
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info->ampbits=oggpack_read(opb,6);
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info->ampdB=oggpack_read(opb,8);
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info->numbooks=oggpack_read(opb,4)+1;
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if(info->order<1)goto err_out;
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if(info->rate<1)goto err_out;
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if(info->barkmap<1)goto err_out;
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if(info->numbooks<1)goto err_out;
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for(j=0;j<info->numbooks;j++){
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info->books[j]=oggpack_read(opb,8);
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if(info->books[j]<0 || info->books[j]>=ci->books)goto err_out;
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}
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return(info);
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err_out:
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floor0_free_info(info);
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return(NULL);
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}
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/* initialize Bark scale and normalization lookups. We could do this
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with static tables, but Vorbis allows a number of possible
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combinations, so it's best to do it computationally.
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The below is authoritative in terms of defining scale mapping.
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Note that the scale depends on the sampling rate as well as the
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linear block and mapping sizes */
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static void floor0_map_lazy_init(vorbis_block *vb,
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vorbis_info_floor *infoX,
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vorbis_look_floor0 *look){
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if(!look->linearmap[vb->W]){
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vorbis_dsp_state *vd=vb->vd;
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vorbis_info *vi=vd->vi;
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codec_setup_info *ci=vi->codec_setup;
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vorbis_info_floor0 *info=(vorbis_info_floor0 *)infoX;
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int W=vb->W;
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int n=ci->blocksizes[W]/2,j;
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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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float scale=look->ln/toBARK(info->rate/2.f);
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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[W]=_ogg_malloc((n+1)*sizeof(**look->linearmap));
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for(j=0;j<n;j++){
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int val=floor( toBARK((info->rate/2.f)/n*j)
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*scale); /* bark numbers represent band edges */
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if(val>=look->ln)val=look->ln-1; /* guard against the approximation */
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look->linearmap[W][j]=val;
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}
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look->linearmap[W][j]=-1;
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look->n[W]=n;
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}
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}
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static vorbis_look_floor *floor0_look(vorbis_dsp_state *vd,
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vorbis_info_floor *i){
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vorbis_info_floor0 *info=(vorbis_info_floor0 *)i;
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vorbis_look_floor0 *look=_ogg_calloc(1,sizeof(*look));
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look->m=info->order;
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look->ln=info->barkmap;
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look->vi=info;
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look->linearmap=_ogg_calloc(2,sizeof(*look->linearmap));
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return look;
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}
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static void *floor0_inverse1(vorbis_block *vb,vorbis_look_floor *i){
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vorbis_look_floor0 *look=(vorbis_look_floor0 *)i;
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vorbis_info_floor0 *info=look->vi;
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int j,k;
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int ampraw=oggpack_read(&vb->opb,info->ampbits);
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if(ampraw>0){ /* also handles the -1 out of data case */
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long maxval=(1<<info->ampbits)-1;
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float amp=(float)ampraw/maxval*info->ampdB;
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int booknum=oggpack_read(&vb->opb,_ilog(info->numbooks));
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if(booknum!=-1 && booknum<info->numbooks){ /* be paranoid */
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codec_setup_info *ci=vb->vd->vi->codec_setup;
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codebook *b=ci->fullbooks+info->books[booknum];
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float last=0.f;
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/* the additional b->dim is a guard against any possible stack
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smash; b->dim is provably more than we can overflow the
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vector */
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float *lsp=_vorbis_block_alloc(vb,sizeof(*lsp)*(look->m+b->dim+1));
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for(j=0;j<look->m;j+=b->dim)
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if(vorbis_book_decodev_set(b,lsp+j,&vb->opb,b->dim)==-1)goto eop;
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for(j=0;j<look->m;){
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for(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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static int floor0_inverse2(vorbis_block *vb,vorbis_look_floor *i,
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void *memo,float *out){
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vorbis_look_floor0 *look=(vorbis_look_floor0 *)i;
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vorbis_info_floor0 *info=look->vi;
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floor0_map_lazy_init(vb,info,look);
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if(memo){
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float *lsp=(float *)memo;
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float amp=lsp[look->m];
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/* take the coefficients back to a spectral envelope curve */
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vorbis_lsp_to_curve(out,
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look->linearmap[vb->W],
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look->n[vb->W],
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look->ln,
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lsp,look->m,amp,(float)info->ampdB);
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return(1);
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}
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memset(out,0,sizeof(*out)*look->n[vb->W]);
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return(0);
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}
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/* export hooks */
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vorbis_func_floor floor0_exportbundle={
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NULL,&floor0_unpack,&floor0_look,&floor0_free_info,
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&floor0_free_look,&floor0_inverse1,&floor0_inverse2
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};
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