apps/codecs/libtremor/mapping0.c

   1 /********************************************************************
   2  *                                                                  *
   3  * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE.   *
   4  *                                                                  *
   5  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
   6  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
   7  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
   8  *                                                                  *
   9  * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002    *
  10  * BY THE Xiph.Org FOUNDATION http://www.xiph.org/                  *
  11  *                                                                  *
  12  ********************************************************************
  13
  14  function: channel mapping 0 implementation
  15
  16  ********************************************************************/
  17
  18 #include "config-tremor.h"
  19 #include <stdio.h>
  20 #include <string.h>
  21 #include <math.h>
  22 #include "ogg.h"
  23 #include "ivorbiscodec.h"
  24 #include "codeclib.h"
  25 #include "codec_internal.h"
  26 #include "codebook.h"
  27 #include "window.h"
  28 #include "registry.h"
  29 #include "misc.h"
  30 #include <codecs/lib/codeclib.h>
  31
  32 /* simplistic, wasteful way of doing this (unique lookup for each
  33    mode/submapping); there should be a central repository for
  34    identical lookups.  That will require minor work, so I'm putting it
  35    off as low priority.
  36
  37    Why a lookup for each backend in a given mode?  Because the
  38    blocksize is set by the mode, and low backend lookups may require
  39    parameters from other areas of the mode/mapping */
  40
  41 typedef struct {
  42   vorbis_info_mode *mode;
  43   vorbis_info_mapping0 *map;
  44
  45   vorbis_look_floor **floor_look;
  46
  47   vorbis_look_residue **residue_look;
  48
  49   vorbis_func_floor **floor_func;
  50   vorbis_func_residue **residue_func;
  51
  52   int ch;
  53   long lastframe; /* if a different mode is called, we need to
  54                      invalidate decay */
  55 } vorbis_look_mapping0;
  56
  57 static void mapping0_free_info(vorbis_info_mapping *i){
  58   vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)i;
  59   if(info){
  60     memset(info,0,sizeof(*info));
  61     _ogg_free(info);
  62   }
  63 }
  64
  65 static void mapping0_free_look(vorbis_look_mapping *look){
  66   int i;
  67   vorbis_look_mapping0 *l=(vorbis_look_mapping0 *)look;
  68   if(l){
  69
  70     for(i=0;i<l->map->submaps;i++){
  71       l->floor_func[i]->free_look(l->floor_look[i]);
  72       l->residue_func[i]->free_look(l->residue_look[i]);
  73     }
  74
  75     _ogg_free(l->floor_func);
  76     _ogg_free(l->residue_func);
  77     _ogg_free(l->floor_look);
  78     _ogg_free(l->residue_look);
  79     memset(l,0,sizeof(*l));
  80     _ogg_free(l);
  81   }
  82 }
  83
  84 static vorbis_look_mapping *mapping0_look(vorbis_dsp_state *vd,vorbis_info_mode *vm,
  85                           vorbis_info_mapping *m){
  86   int i;
  87   vorbis_info          *vi=vd->vi;
  88   codec_setup_info     *ci=(codec_setup_info *)vi->codec_setup;
  89   vorbis_look_mapping0 *look=(vorbis_look_mapping0 *)_ogg_calloc(1,sizeof(*look));
  90   vorbis_info_mapping0 *info=look->map=(vorbis_info_mapping0 *)m;
  91   look->mode=vm;
  92
  93   look->floor_look=(vorbis_look_floor **)_ogg_calloc(info->submaps,sizeof(*look->floor_look));
  94
  95   look->residue_look=(vorbis_look_residue **)_ogg_calloc(info->submaps,sizeof(*look->residue_look));
  96
  97   look->floor_func=(vorbis_func_floor **)_ogg_calloc(info->submaps,sizeof(*look->floor_func));
  98   look->residue_func=(vorbis_func_residue **)_ogg_calloc(info->submaps,sizeof(*look->residue_func));
  99
 100   for(i=0;i<info->submaps;i++){
 101     int floornum=info->floorsubmap[i];
 102     int resnum=info->residuesubmap[i];
 103
 104     look->floor_func[i]=_floor_P[ci->floor_type[floornum]];
 105     look->floor_look[i]=look->floor_func[i]->
 106       look(vd,vm,ci->floor_param[floornum]);
 107     look->residue_func[i]=_residue_P[ci->residue_type[resnum]];
 108     look->residue_look[i]=look->residue_func[i]->
 109       look(vd,vm,ci->residue_param[resnum]);
 110
 111   }
 112
 113   look->ch=vi->channels;
 114
 115   return(look);
 116 }
 117
 118 static int ilog(unsigned int v){
 119   int ret=0;
 120   if(v)--v;
 121   while(v){
 122     ret++;
 123     v>>=1;
 124   }
 125   return(ret);
 126 }
 127
 128
 129 /* also responsible for range checking */
 130 static vorbis_info_mapping *mapping0_unpack(vorbis_info *vi,oggpack_buffer *opb){
 131   int i;
 132   vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)_ogg_calloc(1,sizeof(*info));
 133   codec_setup_info     *ci=(codec_setup_info *)vi->codec_setup;
 134   memset(info,0,sizeof(*info));
 135
 136   if(oggpack_read(opb,1))
 137     info->submaps=oggpack_read(opb,4)+1;
 138   else
 139     info->submaps=1;
 140
 141   if(oggpack_read(opb,1)){
 142     info->coupling_steps=oggpack_read(opb,8)+1;
 143
 144     for(i=0;i<info->coupling_steps;i++){
 145       int testM=info->coupling_mag[i]=oggpack_read(opb,ilog(vi->channels));
 146       int testA=info->coupling_ang[i]=oggpack_read(opb,ilog(vi->channels));
 147
 148       if(testM<0 ||
 149          testA<0 ||
 150          testM==testA ||
 151          testM>=vi->channels ||
 152          testA>=vi->channels) goto err_out;
 153     }
 154
 155   }
 156
 157   if(oggpack_read(opb,2)>0)goto err_out; /* 2,3:reserved */
 158
 159   if(info->submaps>1){
 160     for(i=0;i<vi->channels;i++){
 161       info->chmuxlist[i]=oggpack_read(opb,4);
 162       if(info->chmuxlist[i]>=info->submaps)goto err_out;
 163     }
 164   }
 165   for(i=0;i<info->submaps;i++){
 166     int temp=oggpack_read(opb,8);
 167     if(temp>=ci->times)goto err_out;
 168     info->floorsubmap[i]=oggpack_read(opb,8);
 169     if(info->floorsubmap[i]>=ci->floors)goto err_out;
 170     info->residuesubmap[i]=oggpack_read(opb,8);
 171     if(info->residuesubmap[i]>=ci->residues)goto err_out;
 172   }
 173
 174   return info;
 175
 176  err_out:
 177   mapping0_free_info(info);
 178   return(NULL);
 179 }
 180
 181 #ifdef _ARM_ASSEM_
 182 #define MAGANG( _mag, _ang )\
 183 {\
 184       register int temp;\
 185       asm( "cmp %[mag], #0\n\t"\
 186            "cmpgt %[ang], #0\n\t"\
 187            "subgt %[temp], %[mag], %[ang]\n\t"\
 188            "bgt 1f\n\t"\
 189            "cmp %[mag], #0\n\t"\
 190            "cmple %[ang], #0\n\t"\
 191            "addgt %[temp], %[mag], %[ang]\n\t"\
 192            "suble %[temp], %[mag], %[ang]\n\t"\
 193            "1: cmp %[ang], #0\n\t"\
 194            "movle %[ang], %[mag]\n\t"\
 195            "movle %[mag], %[temp]\n\t"\
 196            "movgt %[ang], %[temp]\n\t"\
 197            : [mag] "+r" ( ( _mag ) ), [ang] "+r" ( ( _ang ) ), [temp] "=&r" (temp)\
 198            :\
 199            : "cc" );\
 200 }
 201
 202 static inline void channel_couple(ogg_int32_t *pcmM, ogg_int32_t *pcmA, int n)
 203 {
 204     ogg_int32_t * const pcmMend = pcmM + n/2;
 205     while(LIKELY(pcmM < pcmMend))
 206     {
 207       register int M0 asm("r2"),M1 asm("r3"),M2 asm("r4"),M3 asm("r5");
 208       register int A0 asm("r6"),A1 asm("r7"),A2 asm("r8"),A3 asm("r9");
 209       asm volatile( "ldmia %[pcmM], {%[M0], %[M1], %[M2], %[M3]}\n\t"
 210                     "ldmia %[pcmA], {%[A0], %[A1], %[A2], %[A3]}\n\t"
 211                     : [M0] "=r" (M0), [M1] "=r" (M1), [M2] "=r" (M2), [M3] "=r" (M3),
 212                       [A0] "=r" (A0), [A1] "=r" (A1), [A2] "=r" (A2), [A3] "=r" (A3)
 213                     : [pcmM] "r" (pcmM), [pcmA] "r" (pcmA) );
 214       MAGANG( M0, A0 );
 215       MAGANG( M1, A1 );
 216       MAGANG( M2, A2 );
 217       MAGANG( M3, A3 );
 218       asm volatile( "stmia %[pcmM]!, {%[M0], %[M1], %[M2], %[M3]}\n\t"
 219                     "stmia %[pcmA]!, {%[A0], %[A1], %[A2], %[A3]}\n\t"
 220                     : [pcmM] "+r" (pcmM), [pcmA] "+r" (pcmA)
 221                     : [M0] "r" (M0), [M1] "r" (M1), [M2] "r" (M2), [M3] "r" (M3),
 222                       [A0] "r" (A0), [A1] "r" (A1), [A2] "r" (A2), [A3] "r" (A3) );
 223     }
 224 }
 225 #else
 226 static inline void channel_couple(ogg_int32_t *pcmM, ogg_int32_t *pcmA, int n)
 227 {
 228     int j;
 229     for(j=0;j<n/2;j++){
 230       ogg_int32_t mag = pcmM[j], ang = pcmA[j];
 231       if(mag>0)
 232         if(ang>0)
 233           pcmA[j]=mag-ang;
 234         else{
 235           pcmA[j]=mag;
 236           pcmM[j]=mag+ang;
 237         }
 238       else
 239         if(ang>0)
 240           pcmA[j]=mag+ang;
 241         else{
 242           pcmA[j]=mag;
 243           pcmM[j]=mag-ang;
 244         }
 245     }
 246 }
 247 #endif
 248
 249 static int mapping0_inverse(vorbis_block *vb,vorbis_look_mapping *l){
 250   vorbis_dsp_state     *vd=vb->vd;
 251   vorbis_info          *vi=vd->vi;
 252   codec_setup_info     *ci=(codec_setup_info *)vi->codec_setup;
 253   private_state        *b=(private_state *)vd->backend_state;
 254   vorbis_look_mapping0 *look=(vorbis_look_mapping0 *)l;
 255   vorbis_info_mapping0 *info=look->map;
 256
 257   int                   i,j;
 258   long                  n=vb->pcmend=ci->blocksizes[vb->W];
 259
 260   /* bounded mapping arrays instead of using alloca();
 261      avoids memory leak; we can only deal with stereo anyway */
 262   ogg_int32_t *pcmbundle[CHANNELS];
 263   int   zerobundle[CHANNELS];
 264   int   nonzero[CHANNELS];
 265   void *floormemo[CHANNELS];
 266
 267   /* time domain information decode (note that applying the
 268      information would have to happen later; we'll probably add a
 269      function entry to the harness for that later */
 270   /* NOT IMPLEMENTED */
 271
 272   /* recover the spectral envelope; store it in the PCM vector for now */
 273   for(i=0;i<vi->channels;i++){
 274     int submap=info->chmuxlist[i];
 275     floormemo[i]=look->floor_func[submap]->
 276       inverse1(vb,look->floor_look[submap]);
 277     if(floormemo[i])
 278       nonzero[i]=1;
 279     else
 280       nonzero[i]=0;
 281     memset(vb->pcm[i],0,sizeof(*vb->pcm[i])*n/2);
 282   }
 283
 284   /* channel coupling can 'dirty' the nonzero listing */
 285   for(i=0;i<info->coupling_steps;i++){
 286     if(nonzero[info->coupling_mag[i]] ||
 287        nonzero[info->coupling_ang[i]]){
 288       nonzero[info->coupling_mag[i]]=1;
 289       nonzero[info->coupling_ang[i]]=1;
 290     }
 291   }
 292
 293   /* recover the residue into our working vectors */
 294   for(i=0;i<info->submaps;i++){
 295     int ch_in_bundle=0;
 296     for(j=0;j<vi->channels;j++){
 297       if(info->chmuxlist[j]==i){
 298         if(nonzero[j])
 299           zerobundle[ch_in_bundle]=1;
 300         else
 301           zerobundle[ch_in_bundle]=0;
 302         pcmbundle[ch_in_bundle++]=vb->pcm[j];
 303       }
 304     }
 305
 306     look->residue_func[i]->inverse(vb,look->residue_look[i],
 307                                    pcmbundle,zerobundle,ch_in_bundle);
 308   }
 309
 310   //for(j=0;j<vi->channels;j++)
 311   //_analysis_output("coupled",seq+j,vb->pcm[j],-8,n/2,0,0);
 312
 313
 314   /* channel coupling */
 315   for(i=info->coupling_steps-1;i>=0;i--){
 316     ogg_int32_t *pcmM=vb->pcm[info->coupling_mag[i]];
 317     ogg_int32_t *pcmA=vb->pcm[info->coupling_ang[i]];
 318     channel_couple(pcmM,pcmA,n);
 319   }
 320
 321   //for(j=0;j<vi->channels;j++)
 322   //_analysis_output("residue",seq+j,vb->pcm[j],-8,n/2,0,0);
 323
 324   //for(j=0;j<vi->channels;j++)
 325   //_analysis_output("mdct",seq+j,vb->pcm[j],-24,n/2,0,1);
 326
 327   /* transform the PCM data; takes PCM vector, vb; modifies PCM vector */
 328   /* only MDCT right now.... */
 329
 330   for(i=0;i<vi->channels;i++){
 331     ogg_int32_t *pcm=vb->pcm[i];
 332     int submap=info->chmuxlist[i];
 333
 334     if(nonzero[i]) {
 335       /* compute and apply spectral envelope */
 336       look->floor_func[submap]->
 337         inverse2(vb,look->floor_look[submap],floormemo[i],pcm);
 338
 339       ff_imdct_calc(ci->blocksizes_nbits[vb->W],
 340                     (int32_t*)pcm,
 341                     (int32_t*)pcm);
 342       /* window the data */
 343       _vorbis_apply_window(pcm,b->window,ci->blocksizes,vb->lW,vb->W,vb->nW);
 344     }
 345     else
 346       memset(pcm, 0, sizeof(ogg_int32_t)*n);
 347   }
 348
 349   //for(j=0;j<vi->channels;j++)
 350   //_analysis_output("imdct",seq+j,vb->pcm[j],-24,n,0,0);
 351
 352   //for(j=0;j<vi->channels;j++)
 353   //_analysis_output("window",seq+j,vb->pcm[j],-24,n,0,0);
 354
 355   //seq+=vi->channels;
 356   /* all done! */
 357   return(0);
 358 }
 359
 360 /* export hooks */
 361 const vorbis_func_mapping mapping0_exportbundle ICONST_ATTR ={
 362   &mapping0_unpack,
 363   &mapping0_look,
 364   &mapping0_free_info,
 365   &mapping0_free_look,
 366   &mapping0_inverse
 367 };
 368