+++ /dev/null
-/********************************************************************
- * *
- * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
- * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
- * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
- * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
- * *
- * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007 *
- * by the Xiph.Org Foundation http://www.xiph.org/ *
- * *
- ********************************************************************
-
- function: floor backend 0 implementation
- last mod: $Id: floor0.c 13293 2007-07-24 00:09:47Z xiphmont $
-
- ********************************************************************/
-
-#include <stdlib.h>
-#include <string.h>
-#include <math.h>
-#include <ogg/ogg.h>
-#include "vorbis/codec.h"
-#include "codec_internal.h"
-#include "registry.h"
-#include "lpc.h"
-#include "lsp.h"
-#include "codebook.h"
-#include "scales.h"
-#include "misc.h"
-#include "os.h"
-
-#include "misc.h"
-#include <stdio.h>
-
-typedef struct {
- int ln;
- int m;
- int **linearmap;
- int n[2];
-
- vorbis_info_floor0 *vi;
-
- long bits;
- long frames;
-} vorbis_look_floor0;
-
-
-/***********************************************/
-
-static void floor0_free_info(vorbis_info_floor *i){
- vorbis_info_floor0 *info=(vorbis_info_floor0 *)i;
- if(info){
- memset(info,0,sizeof(*info));
- _ogg_free(info);
- }
-}
-
-static void floor0_free_look(vorbis_look_floor *i){
- vorbis_look_floor0 *look=(vorbis_look_floor0 *)i;
- if(look){
-
- if(look->linearmap){
-
- if(look->linearmap[0])_ogg_free(look->linearmap[0]);
- if(look->linearmap[1])_ogg_free(look->linearmap[1]);
-
- _ogg_free(look->linearmap);
- }
- memset(look,0,sizeof(*look));
- _ogg_free(look);
- }
-}
-
-static vorbis_info_floor *floor0_unpack (vorbis_info *vi,oggpack_buffer *opb){
- codec_setup_info *ci=vi->codec_setup;
- int j;
-
- vorbis_info_floor0 *info=_ogg_malloc(sizeof(*info));
- info->order=oggpack_read(opb,8);
- info->rate=oggpack_read(opb,16);
- info->barkmap=oggpack_read(opb,16);
- info->ampbits=oggpack_read(opb,6);
- info->ampdB=oggpack_read(opb,8);
- info->numbooks=oggpack_read(opb,4)+1;
-
- if(info->order<1)goto err_out;
- if(info->rate<1)goto err_out;
- if(info->barkmap<1)goto err_out;
- if(info->numbooks<1)goto err_out;
-
- for(j=0;j<info->numbooks;j++){
- info->books[j]=oggpack_read(opb,8);
- if(info->books[j]<0 || info->books[j]>=ci->books)goto err_out;
- }
- return(info);
-
- err_out:
- floor0_free_info(info);
- return(NULL);
-}
-
-/* initialize Bark scale and normalization lookups. We could do this
- with static tables, but Vorbis allows a number of possible
- combinations, so it's best to do it computationally.
-
- The below is authoritative in terms of defining scale mapping.
- Note that the scale depends on the sampling rate as well as the
- linear block and mapping sizes */
-
-static void floor0_map_lazy_init(vorbis_block *vb,
- vorbis_info_floor *infoX,
- vorbis_look_floor0 *look){
- if(!look->linearmap[vb->W]){
- vorbis_dsp_state *vd=vb->vd;
- vorbis_info *vi=vd->vi;
- codec_setup_info *ci=vi->codec_setup;
- vorbis_info_floor0 *info=(vorbis_info_floor0 *)infoX;
- int W=vb->W;
- int n=ci->blocksizes[W]/2,j;
-
- /* we choose a scaling constant so that:
- floor(bark(rate/2-1)*C)=mapped-1
- floor(bark(rate/2)*C)=mapped */
- float scale=look->ln/toBARK(info->rate/2.f);
-
- /* the mapping from a linear scale to a smaller bark scale is
- straightforward. We do *not* make sure that the linear mapping
- does not skip bark-scale bins; the decoder simply skips them and
- the encoder may do what it wishes in filling them. They're
- necessary in some mapping combinations to keep the scale spacing
- accurate */
- look->linearmap[W]=_ogg_malloc((n+1)*sizeof(**look->linearmap));
- for(j=0;j<n;j++){
- int val=floor( toBARK((info->rate/2.f)/n*j)
- *scale); /* bark numbers represent band edges */
- if(val>=look->ln)val=look->ln-1; /* guard against the approximation */
- look->linearmap[W][j]=val;
- }
- look->linearmap[W][j]=-1;
- look->n[W]=n;
- }
-}
-
-static vorbis_look_floor *floor0_look(vorbis_dsp_state *vd,
- vorbis_info_floor *i){
- vorbis_info_floor0 *info=(vorbis_info_floor0 *)i;
- vorbis_look_floor0 *look=_ogg_calloc(1,sizeof(*look));
- look->m=info->order;
- look->ln=info->barkmap;
- look->vi=info;
-
- look->linearmap=_ogg_calloc(2,sizeof(*look->linearmap));
-
- return look;
-}
-
-static void *floor0_inverse1(vorbis_block *vb,vorbis_look_floor *i){
- vorbis_look_floor0 *look=(vorbis_look_floor0 *)i;
- vorbis_info_floor0 *info=look->vi;
- int j,k;
-
- int ampraw=oggpack_read(&vb->opb,info->ampbits);
- if(ampraw>0){ /* also handles the -1 out of data case */
- long maxval=(1<<info->ampbits)-1;
- float amp=(float)ampraw/maxval*info->ampdB;
- int booknum=oggpack_read(&vb->opb,_ilog(info->numbooks));
-
- if(booknum!=-1 && booknum<info->numbooks){ /* be paranoid */
- codec_setup_info *ci=vb->vd->vi->codec_setup;
- codebook *b=ci->fullbooks+info->books[booknum];
- float last=0.f;
-
- /* the additional b->dim is a guard against any possible stack
- smash; b->dim is provably more than we can overflow the
- vector */
- float *lsp=_vorbis_block_alloc(vb,sizeof(*lsp)*(look->m+b->dim+1));
-
- for(j=0;j<look->m;j+=b->dim)
- if(vorbis_book_decodev_set(b,lsp+j,&vb->opb,b->dim)==-1)goto eop;
- for(j=0;j<look->m;){
- for(k=0;k<b->dim;k++,j++)lsp[j]+=last;
- last=lsp[j-1];
- }
-
- lsp[look->m]=amp;
- return(lsp);
- }
- }
- eop:
- return(NULL);
-}
-
-static int floor0_inverse2(vorbis_block *vb,vorbis_look_floor *i,
- void *memo,float *out){
- vorbis_look_floor0 *look=(vorbis_look_floor0 *)i;
- vorbis_info_floor0 *info=look->vi;
-
- floor0_map_lazy_init(vb,info,look);
-
- if(memo){
- float *lsp=(float *)memo;
- float amp=lsp[look->m];
-
- /* take the coefficients back to a spectral envelope curve */
- vorbis_lsp_to_curve(out,
- look->linearmap[vb->W],
- look->n[vb->W],
- look->ln,
- lsp,look->m,amp,(float)info->ampdB);
- return(1);
- }
- memset(out,0,sizeof(*out)*look->n[vb->W]);
- return(0);
-}
-
-/* export hooks */
-vorbis_func_floor floor0_exportbundle={
- NULL,&floor0_unpack,&floor0_look,&floor0_free_info,
- &floor0_free_look,&floor0_inverse1,&floor0_inverse2
-};
-
-
-
projects / vuplus_xbmc / blobdiff