--- a/misc/libtremor/tremor/floor0.c Fri Oct 11 11:55:31 2013 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,435 +0,0 @@
-/********************************************************************
- * *
- * THIS FILE IS PART OF THE OggVorbis 'TREMOR' 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 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
- * BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
- * *
- ********************************************************************
-
- function: floor backend 0 implementation
-
- ********************************************************************/
-
-#include <stdlib.h>
-#include <string.h>
-#include <math.h>
-#include "ogg.h"
-#include "ivorbiscodec.h"
-#include "codec_internal.h"
-#include "registry.h"
-#include "codebook.h"
-#include "misc.h"
-#include "block.h"
-
-#define LSP_FRACBITS 14
-
-typedef struct {
- long n;
- int ln;
- int m;
- int *linearmap;
-
- vorbis_info_floor0 *vi;
- ogg_int32_t *lsp_look;
-
-} vorbis_look_floor0;
-
-/*************** LSP decode ********************/
-
-#include "lsp_lookup.h"
-
-/* interpolated 1./sqrt(p) where .5 <= a < 1. (.100000... to .111111...) in
- 16.16 format
- returns in m.8 format */
-
-static long ADJUST_SQRT2[2]={8192,5792};
-STIN ogg_int32_t vorbis_invsqlook_i(long a,long e){
- long i=(a&0x7fff)>>(INVSQ_LOOKUP_I_SHIFT-1);
- long d=a&INVSQ_LOOKUP_I_MASK; /* 0.10 */
- long val=INVSQ_LOOKUP_I[i]- /* 1.16 */
- ((INVSQ_LOOKUP_IDel[i]*d)>>INVSQ_LOOKUP_I_SHIFT); /* result 1.16 */
- val*=ADJUST_SQRT2[e&1];
- e=(e>>1)+21;
- return(val>>e);
-}
-
-/* interpolated lookup based fromdB function, domain -140dB to 0dB only */
-/* a is in n.12 format */
-STIN ogg_int32_t vorbis_fromdBlook_i(long a){
- int i=(-a)>>(12-FROMdB2_SHIFT);
- if(i<0) return 0x7fffffff;
- if(i>=(FROMdB_LOOKUP_SZ<<FROMdB_SHIFT))return 0;
-
- return FROMdB_LOOKUP[i>>FROMdB_SHIFT] * FROMdB2_LOOKUP[i&FROMdB2_MASK];
-}
-
-/* interpolated lookup based cos function, domain 0 to PI only */
-/* a is in 0.16 format, where 0==0, 2^^16-1==PI, return 0.14 */
-STIN ogg_int32_t vorbis_coslook_i(long a){
- int i=a>>COS_LOOKUP_I_SHIFT;
- int d=a&COS_LOOKUP_I_MASK;
- return COS_LOOKUP_I[i]- ((d*(COS_LOOKUP_I[i]-COS_LOOKUP_I[i+1]))>>
- COS_LOOKUP_I_SHIFT);
-}
-
-/* interpolated lookup based cos function */
-/* a is in 0.16 format, where 0==0, 2^^16==PI, return .LSP_FRACBITS */
-STIN ogg_int32_t vorbis_coslook2_i(long a){
- a=a&0x1ffff;
-
- if(a>0x10000)a=0x20000-a;
- {
- int i=a>>COS_LOOKUP_I_SHIFT;
- int d=a&COS_LOOKUP_I_MASK;
- a=((COS_LOOKUP_I[i]<<COS_LOOKUP_I_SHIFT)-
- d*(COS_LOOKUP_I[i]-COS_LOOKUP_I[i+1]))>>
- (COS_LOOKUP_I_SHIFT-LSP_FRACBITS+14);
- }
-
- return(a);
-}
-
-static const int barklook[28]={
- 0,100,200,301, 405,516,635,766,
- 912,1077,1263,1476, 1720,2003,2333,2721,
- 3184,3742,4428,5285, 6376,7791,9662,12181,
- 15624,20397,27087,36554
-};
-
-/* used in init only; interpolate the long way */
-STIN ogg_int32_t toBARK(int n){
- int i;
- for(i=0;i<27;i++)
- if(n>=barklook[i] && n<barklook[i+1])break;
-
- if(i==27){
- return 27<<15;
- }else{
- int gap=barklook[i+1]-barklook[i];
- int del=n-barklook[i];
-
- return((i<<15)+((del<<15)/gap));
- }
-}
-
-static const unsigned char MLOOP_1[64]={
- 0,10,11,11, 12,12,12,12, 13,13,13,13, 13,13,13,13,
- 14,14,14,14, 14,14,14,14, 14,14,14,14, 14,14,14,14,
- 15,15,15,15, 15,15,15,15, 15,15,15,15, 15,15,15,15,
- 15,15,15,15, 15,15,15,15, 15,15,15,15, 15,15,15,15,
-};
-
-static const unsigned char MLOOP_2[64]={
- 0,4,5,5, 6,6,6,6, 7,7,7,7, 7,7,7,7,
- 8,8,8,8, 8,8,8,8, 8,8,8,8, 8,8,8,8,
- 9,9,9,9, 9,9,9,9, 9,9,9,9, 9,9,9,9,
- 9,9,9,9, 9,9,9,9, 9,9,9,9, 9,9,9,9,
-};
-
-static const unsigned char MLOOP_3[8]={0,1,2,2,3,3,3,3};
-
-void vorbis_lsp_to_curve(ogg_int32_t *curve,int *map,int n,int ln,
- ogg_int32_t *lsp,int m,
- ogg_int32_t amp,
- ogg_int32_t ampoffset,
- ogg_int32_t *icos){
-
- /* 0 <= m < 256 */
-
- /* set up for using all int later */
- int i;
- int ampoffseti=ampoffset*4096;
- int ampi=amp;
- ogg_int32_t *ilsp=(ogg_int32_t *)alloca(m*sizeof(*ilsp));
- /* lsp is in 8.24, range 0 to PI; coslook wants it in .16 0 to 1*/
- for(i=0;i<m;i++){
-#ifndef _LOW_ACCURACY_
- ogg_int32_t val=MULT32(lsp[i],0x517cc2);
-#else
- ogg_int32_t val=((lsp[i]>>10)*0x517d)>>14;
-#endif
-
- /* safeguard against a malicious stream */
- if(val<0 || (val>>COS_LOOKUP_I_SHIFT)>=COS_LOOKUP_I_SZ){
- memset(curve,0,sizeof(*curve)*n);
- return;
- }
-
- ilsp[i]=vorbis_coslook_i(val);
- }
-
- i=0;
- while(i<n){
- int j,k=map[i];
- ogg_uint32_t pi=46341; /* 2**-.5 in 0.16 */
- ogg_uint32_t qi=46341;
- ogg_int32_t qexp=0,shift;
- ogg_int32_t wi=icos[k];
-
-#ifdef _V_LSP_MATH_ASM
- lsp_loop_asm(&qi,&pi,&qexp,ilsp,wi,m);
-
- pi=((pi*pi)>>16);
- qi=((qi*qi)>>16);
-
- if(m&1){
- qexp= qexp*2-28*((m+1)>>1)+m;
- pi*=(1<<14)-((wi*wi)>>14);
- qi+=pi>>14;
- }else{
- qexp= qexp*2-13*m;
-
- pi*=(1<<14)-wi;
- qi*=(1<<14)+wi;
-
- qi=(qi+pi)>>14;
- }
-
- if(qi&0xffff0000){ /* checks for 1.xxxxxxxxxxxxxxxx */
- qi>>=1; qexp++;
- }else
- lsp_norm_asm(&qi,&qexp);
-
-#else
-
- qi*=labs(ilsp[0]-wi);
- pi*=labs(ilsp[1]-wi);
-
- for(j=3;j<m;j+=2){
- if(!(shift=MLOOP_1[(pi|qi)>>25]))
- if(!(shift=MLOOP_2[(pi|qi)>>19]))
- shift=MLOOP_3[(pi|qi)>>16];
- qi=(qi>>shift)*labs(ilsp[j-1]-wi);
- pi=(pi>>shift)*labs(ilsp[j]-wi);
- qexp+=shift;
- }
- if(!(shift=MLOOP_1[(pi|qi)>>25]))
- if(!(shift=MLOOP_2[(pi|qi)>>19]))
- shift=MLOOP_3[(pi|qi)>>16];
-
- /* pi,qi normalized collectively, both tracked using qexp */
-
- if(m&1){
- /* odd order filter; slightly assymetric */
- /* the last coefficient */
- qi=(qi>>shift)*labs(ilsp[j-1]-wi);
- pi=(pi>>shift)<<14;
- qexp+=shift;
-
- if(!(shift=MLOOP_1[(pi|qi)>>25]))
- if(!(shift=MLOOP_2[(pi|qi)>>19]))
- shift=MLOOP_3[(pi|qi)>>16];
-
- pi>>=shift;
- qi>>=shift;
- qexp+=shift-14*((m+1)>>1);
-
- pi=((pi*pi)>>16);
- qi=((qi*qi)>>16);
- qexp=qexp*2+m;
-
- pi*=(1<<14)-((wi*wi)>>14);
- qi+=pi>>14;
-
- }else{
- /* even order filter; still symmetric */
-
- /* p*=p(1-w), q*=q(1+w), let normalization drift because it isn't
- worth tracking step by step */
-
- pi>>=shift;
- qi>>=shift;
- qexp+=shift-7*m;
-
- pi=((pi*pi)>>16);
- qi=((qi*qi)>>16);
- qexp=qexp*2+m;
-
- pi*=(1<<14)-wi;
- qi*=(1<<14)+wi;
- qi=(qi+pi)>>14;
-
- }
-
-
- /* we've let the normalization drift because it wasn't important;
- however, for the lookup, things must be normalized again. We
- need at most one right shift or a number of left shifts */
-
- if(qi&0xffff0000){ /* checks for 1.xxxxxxxxxxxxxxxx */
- qi>>=1; qexp++;
- }else
- while(qi && !(qi&0x8000)){ /* checks for 0.0xxxxxxxxxxxxxxx or less*/
- qi<<=1; qexp--;
- }
-
-#endif
-
- amp=vorbis_fromdBlook_i(ampi* /* n.4 */
- vorbis_invsqlook_i(qi,qexp)-
- /* m.8, m+n<=8 */
- ampoffseti); /* 8.12[0] */
-
-#ifdef _LOW_ACCURACY_
- amp>>=9;
-#endif
- curve[i]= MULT31_SHIFT15(curve[i],amp);
- while(map[++i]==k) curve[i]= MULT31_SHIFT15(curve[i],amp);
- }
-}
-
-/*************** vorbis decode glue ************/
-
-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)_ogg_free(look->linearmap);
- if(look->lsp_look)_ogg_free(look->lsp_look);
- memset(look,0,sizeof(*look));
- _ogg_free(look);
- }
-}
-
-static vorbis_info_floor *floor0_unpack (vorbis_info *vi,oggpack_buffer *opb){
- codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
- int j;
-
- vorbis_info_floor0 *info=(vorbis_info_floor0 *)_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 vorbis_look_floor *floor0_look (vorbis_dsp_state *vd,vorbis_info_mode *mi,
- vorbis_info_floor *i){
- int j;
- vorbis_info *vi=vd->vi;
- codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
- vorbis_info_floor0 *info=(vorbis_info_floor0 *)i;
- vorbis_look_floor0 *look=(vorbis_look_floor0 *)_ogg_calloc(1,sizeof(*look));
- look->m=info->order;
- look->n=ci->blocksizes[mi->blockflag]/2;
- look->ln=info->barkmap;
- look->vi=info;
-
- /* 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=(int *)_ogg_malloc((look->n+1)*sizeof(*look->linearmap));
- for(j=0;j<look->n;j++){
-
- int val=(look->ln*
- ((toBARK(info->rate/2*j/look->n)<<11)/toBARK(info->rate/2)))>>11;
-
- if(val>=look->ln)val=look->ln-1; /* guard against the approximation */
- look->linearmap[j]=val;
- }
- look->linearmap[j]=-1;
-
- look->lsp_look=(ogg_int32_t *)_ogg_malloc(look->ln*sizeof(*look->lsp_look));
- for(j=0;j<look->ln;j++)
- look->lsp_look[j]=vorbis_coslook2_i(0x10000*j/look->ln);
-
- 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;
- int amp=((ampraw*info->ampdB)<<4)/maxval;
- int booknum=oggpack_read(&vb->opb,_ilog(info->numbooks));
-
- if(booknum!=-1 && booknum<info->numbooks){ /* be paranoid */
- codec_setup_info *ci=(codec_setup_info *)vb->vd->vi->codec_setup;
- codebook *b=ci->fullbooks+info->books[booknum];
- ogg_int32_t last=0;
- ogg_int32_t *lsp=(ogg_int32_t *)_vorbis_block_alloc(vb,sizeof(*lsp)*(look->m+1));
-
- for(j=0;j<look->m;j+=b->dim)
- if(vorbis_book_decodev_set(b,lsp+j,&vb->opb,b->dim,-24)==-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,ogg_int32_t *out){
- vorbis_look_floor0 *look=(vorbis_look_floor0 *)i;
- vorbis_info_floor0 *info=look->vi;
-
- if(memo){
- ogg_int32_t *lsp=(ogg_int32_t *)memo;
- ogg_int32_t amp=lsp[look->m];
-
- /* take the coefficients back to a spectral envelope curve */
- vorbis_lsp_to_curve(out,look->linearmap,look->n,look->ln,
- lsp,look->m,amp,info->ampdB,look->lsp_look);
- return(1);
- }
- memset(out,0,sizeof(*out)*look->n);
- return(0);
-}
-
-/* export hooks */
-vorbis_func_floor floor0_exportbundle={
- &floor0_unpack,&floor0_look,&floor0_free_info,
- &floor0_free_look,&floor0_inverse1,&floor0_inverse2
-};
-
-