misc/libtremor/mapping0.c
author koda
Sun, 24 Apr 2011 22:57:57 +0200
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add libTremor sources (integer-only libvorbis implementation) to repo and ios project
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/********************************************************************
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 *                                                                  *
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 * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE.   *
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 *                                                                  *
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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 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002    *
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 * BY THE Xiph.Org FOUNDATION http://www.xiph.org/                  *
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 *                                                                  *
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 ********************************************************************
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 function: channel mapping 0 implementation
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 ********************************************************************/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include "ogg.h"
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#include "ivorbiscodec.h"
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#include "mdct.h"
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#include "codec_internal.h"
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#include "codebook.h"
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#include "window.h"
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#include "registry.h"
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#include "misc.h"
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/* simplistic, wasteful way of doing this (unique lookup for each
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   mode/submapping); there should be a central repository for
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   identical lookups.  That will require minor work, so I'm putting it
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   off as low priority.
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   Why a lookup for each backend in a given mode?  Because the
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   blocksize is set by the mode, and low backend lookups may require
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   parameters from other areas of the mode/mapping */
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typedef struct {
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  vorbis_info_mode *mode;
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  vorbis_info_mapping0 *map;
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  vorbis_look_floor **floor_look;
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  vorbis_look_residue **residue_look;
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  vorbis_func_floor **floor_func;
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  vorbis_func_residue **residue_func;
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  int ch;
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  long lastframe; /* if a different mode is called, we need to 
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		     invalidate decay */
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} vorbis_look_mapping0;
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static void mapping0_free_info(vorbis_info_mapping *i){
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  vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)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 mapping0_free_look(vorbis_look_mapping *look){
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  int i;
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  vorbis_look_mapping0 *l=(vorbis_look_mapping0 *)look;
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  if(l){
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    for(i=0;i<l->map->submaps;i++){
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      l->floor_func[i]->free_look(l->floor_look[i]);
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      l->residue_func[i]->free_look(l->residue_look[i]);
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    }
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    _ogg_free(l->floor_func);
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    _ogg_free(l->residue_func);
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    _ogg_free(l->floor_look);
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    _ogg_free(l->residue_look);
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    memset(l,0,sizeof(*l));
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    _ogg_free(l);
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  }
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}
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static vorbis_look_mapping *mapping0_look(vorbis_dsp_state *vd,vorbis_info_mode *vm,
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			  vorbis_info_mapping *m){
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  int i;
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  vorbis_info          *vi=vd->vi;
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  codec_setup_info     *ci=(codec_setup_info *)vi->codec_setup;
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  vorbis_look_mapping0 *look=(vorbis_look_mapping0 *)_ogg_calloc(1,sizeof(*look));
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  vorbis_info_mapping0 *info=look->map=(vorbis_info_mapping0 *)m;
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  look->mode=vm;
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  look->floor_look=(vorbis_look_floor **)_ogg_calloc(info->submaps,sizeof(*look->floor_look));
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  look->residue_look=(vorbis_look_residue **)_ogg_calloc(info->submaps,sizeof(*look->residue_look));
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  look->floor_func=(vorbis_func_floor **)_ogg_calloc(info->submaps,sizeof(*look->floor_func));
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  look->residue_func=(vorbis_func_residue **)_ogg_calloc(info->submaps,sizeof(*look->residue_func));
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  for(i=0;i<info->submaps;i++){
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    int floornum=info->floorsubmap[i];
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    int resnum=info->residuesubmap[i];
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    look->floor_func[i]=_floor_P[ci->floor_type[floornum]];
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    look->floor_look[i]=look->floor_func[i]->
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      look(vd,vm,ci->floor_param[floornum]);
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    look->residue_func[i]=_residue_P[ci->residue_type[resnum]];
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    look->residue_look[i]=look->residue_func[i]->
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      look(vd,vm,ci->residue_param[resnum]);
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  }
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  look->ch=vi->channels;
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  return(look);
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}
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static int ilog(unsigned int v){
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  int ret=0;
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  if(v)--v;
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  while(v){
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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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/* also responsible for range checking */
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static vorbis_info_mapping *mapping0_unpack(vorbis_info *vi,oggpack_buffer *opb){
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  int i;
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  vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)_ogg_calloc(1,sizeof(*info));
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  codec_setup_info     *ci=(codec_setup_info *)vi->codec_setup;
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  memset(info,0,sizeof(*info));
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  if(oggpack_read(opb,1))
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    info->submaps=oggpack_read(opb,4)+1;
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   136
  else
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    info->submaps=1;
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   138
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  if(oggpack_read(opb,1)){
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   140
    info->coupling_steps=oggpack_read(opb,8)+1;
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   141
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    for(i=0;i<info->coupling_steps;i++){
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      int testM=info->coupling_mag[i]=oggpack_read(opb,ilog(vi->channels));
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      int testA=info->coupling_ang[i]=oggpack_read(opb,ilog(vi->channels));
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   145
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      if(testM<0 || 
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	 testA<0 || 
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	 testM==testA || 
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	 testM>=vi->channels ||
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	 testA>=vi->channels) goto err_out;
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   151
    }
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  }
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  if(oggpack_read(opb,2)>0)goto err_out; /* 2,3:reserved */
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   156
    
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  if(info->submaps>1){
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    for(i=0;i<vi->channels;i++){
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      info->chmuxlist[i]=oggpack_read(opb,4);
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      if(info->chmuxlist[i]>=info->submaps)goto err_out;
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   161
    }
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  }
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  for(i=0;i<info->submaps;i++){
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    int temp=oggpack_read(opb,8);
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    if(temp>=ci->times)goto err_out;
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    info->floorsubmap[i]=oggpack_read(opb,8);
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    if(info->floorsubmap[i]>=ci->floors)goto err_out;
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    info->residuesubmap[i]=oggpack_read(opb,8);
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    if(info->residuesubmap[i]>=ci->residues)goto err_out;
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   170
  }
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  return info;
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   173
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 err_out:
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  mapping0_free_info(info);
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  return(NULL);
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}
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static int seq=0;
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static int mapping0_inverse(vorbis_block *vb,vorbis_look_mapping *l){
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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=(codec_setup_info *)vi->codec_setup;
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  private_state        *b=(private_state *)vd->backend_state;
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  vorbis_look_mapping0 *look=(vorbis_look_mapping0 *)l;
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  vorbis_info_mapping0 *info=look->map;
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  int                   i,j;
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  long                  n=vb->pcmend=ci->blocksizes[vb->W];
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   190
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  ogg_int32_t **pcmbundle=(ogg_int32_t **)alloca(sizeof(*pcmbundle)*vi->channels);
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   192
  int    *zerobundle=(int *)alloca(sizeof(*zerobundle)*vi->channels);
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   193
  
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   194
  int   *nonzero  =(int *)alloca(sizeof(*nonzero)*vi->channels);
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   195
  void **floormemo=(void **)alloca(sizeof(*floormemo)*vi->channels);
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   196
  
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   197
  /* time domain information decode (note that applying the
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   198
     information would have to happen later; we'll probably add a
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   199
     function entry to the harness for that later */
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  /* NOT IMPLEMENTED */
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   201
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   202
  /* recover the spectral envelope; store it in the PCM vector for now */
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   203
  for(i=0;i<vi->channels;i++){
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   204
    int submap=info->chmuxlist[i];
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   205
    floormemo[i]=look->floor_func[submap]->
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   206
      inverse1(vb,look->floor_look[submap]);
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   207
    if(floormemo[i])
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   208
      nonzero[i]=1;
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   209
    else
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   210
      nonzero[i]=0;      
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   211
    memset(vb->pcm[i],0,sizeof(*vb->pcm[i])*n/2);
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   212
  }
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   213
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   214
  /* channel coupling can 'dirty' the nonzero listing */
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   215
  for(i=0;i<info->coupling_steps;i++){
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   216
    if(nonzero[info->coupling_mag[i]] ||
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   217
       nonzero[info->coupling_ang[i]]){
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   218
      nonzero[info->coupling_mag[i]]=1; 
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   219
      nonzero[info->coupling_ang[i]]=1; 
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   220
    }
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   221
  }
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   222
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  /* recover the residue into our working vectors */
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   224
  for(i=0;i<info->submaps;i++){
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   225
    int ch_in_bundle=0;
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   226
    for(j=0;j<vi->channels;j++){
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   227
      if(info->chmuxlist[j]==i){
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   228
	if(nonzero[j])
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   229
	  zerobundle[ch_in_bundle]=1;
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   230
	else
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   231
	  zerobundle[ch_in_bundle]=0;
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   232
	pcmbundle[ch_in_bundle++]=vb->pcm[j];
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   233
      }
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   234
    }
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   235
    
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   236
    look->residue_func[i]->inverse(vb,look->residue_look[i],
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   237
				   pcmbundle,zerobundle,ch_in_bundle);
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   238
  }
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   239
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   240
  //for(j=0;j<vi->channels;j++)
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   241
  //_analysis_output("coupled",seq+j,vb->pcm[j],-8,n/2,0,0);
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   242
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   243
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   244
  /* channel coupling */
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   245
  for(i=info->coupling_steps-1;i>=0;i--){
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   246
    ogg_int32_t *pcmM=vb->pcm[info->coupling_mag[i]];
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   247
    ogg_int32_t *pcmA=vb->pcm[info->coupling_ang[i]];
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   248
    
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   249
    for(j=0;j<n/2;j++){
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   250
      ogg_int32_t mag=pcmM[j];
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   251
      ogg_int32_t ang=pcmA[j];
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   252
      
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   253
      if(mag>0)
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   254
	if(ang>0){
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   255
	  pcmM[j]=mag;
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   256
	  pcmA[j]=mag-ang;
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   257
	}else{
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   258
	  pcmA[j]=mag;
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	  pcmM[j]=mag+ang;
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   260
	}
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   261
      else
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   262
	if(ang>0){
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	  pcmM[j]=mag;
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   264
	  pcmA[j]=mag+ang;
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   265
	}else{
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	  pcmA[j]=mag;
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	  pcmM[j]=mag-ang;
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   268
	}
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   269
    }
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   270
  }
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  //for(j=0;j<vi->channels;j++)
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  //_analysis_output("residue",seq+j,vb->pcm[j],-8,n/2,0,0);
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  /* compute and apply spectral envelope */
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  for(i=0;i<vi->channels;i++){
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    ogg_int32_t *pcm=vb->pcm[i];
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    int submap=info->chmuxlist[i];
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    look->floor_func[submap]->
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      inverse2(vb,look->floor_look[submap],floormemo[i],pcm);
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  }
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  //for(j=0;j<vi->channels;j++)
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  //_analysis_output("mdct",seq+j,vb->pcm[j],-24,n/2,0,1);
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  /* transform the PCM data; takes PCM vector, vb; modifies PCM vector */
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  /* only MDCT right now.... */
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  for(i=0;i<vi->channels;i++){
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    ogg_int32_t *pcm=vb->pcm[i];
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    mdct_backward(n,pcm,pcm);
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  }
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  //for(j=0;j<vi->channels;j++)
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  //_analysis_output("imdct",seq+j,vb->pcm[j],-24,n,0,0);
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  /* window the data */
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  for(i=0;i<vi->channels;i++){
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    ogg_int32_t *pcm=vb->pcm[i];
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    if(nonzero[i])
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      _vorbis_apply_window(pcm,b->window,ci->blocksizes,vb->lW,vb->W,vb->nW);
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    else
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      for(j=0;j<n;j++)
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	pcm[j]=0;
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  }
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  //for(j=0;j<vi->channels;j++)
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  //_analysis_output("window",seq+j,vb->pcm[j],-24,n,0,0);
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  seq+=vi->channels;
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  /* all done! */
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  return(0);
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}
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/* export hooks */
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vorbis_func_mapping mapping0_exportbundle={
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  &mapping0_unpack,
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  &mapping0_look,
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  &mapping0_free_info,
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  &mapping0_free_look,
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  &mapping0_inverse
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};