/******************************************************************** *                                                                  * * 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: channel mapping 0 implementation ********************************************************************/#include <stdlib.h>#include <stdio.h>#include <string.h>#include <math.h>#include "ogg.h"#include "ivorbiscodec.h"#include "mdct.h"#include "codec_internal.h"#include "codebook.h"#include "window.h"#include "registry.h"#include "misc.h"/* simplistic, wasteful way of doing this (unique lookup for each   mode/submapping); there should be a central repository for   identical lookups.  That will require minor work, so I'm putting it   off as low priority.   Why a lookup for each backend in a given mode?  Because the   blocksize is set by the mode, and low backend lookups may require   parameters from other areas of the mode/mapping */typedef struct {  vorbis_info_mode *mode;  vorbis_info_mapping0 *map;  vorbis_look_floor **floor_look;  vorbis_look_residue **residue_look;  vorbis_func_floor **floor_func;  vorbis_func_residue **residue_func;  int ch;  long lastframe; /* if a different mode is called, we need to 		     invalidate decay */} vorbis_look_mapping0;static void mapping0_free_info(vorbis_info_mapping *i){  vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)i;  if(info){    memset(info,0,sizeof(*info));    _ogg_free(info);  }}static void mapping0_free_look(vorbis_look_mapping *look){  int i;  vorbis_look_mapping0 *l=(vorbis_look_mapping0 *)look;  if(l){    for(i=0;i<l->map->submaps;i++){      l->floor_func[i]->free_look(l->floor_look[i]);      l->residue_func[i]->free_look(l->residue_look[i]);    }    _ogg_free(l->floor_func);    _ogg_free(l->residue_func);    _ogg_free(l->floor_look);    _ogg_free(l->residue_look);    memset(l,0,sizeof(*l));    _ogg_free(l);  }}static vorbis_look_mapping *mapping0_look(vorbis_dsp_state *vd,vorbis_info_mode *vm,			  vorbis_info_mapping *m){  int i;  vorbis_info          *vi=vd->vi;  codec_setup_info     *ci=(codec_setup_info *)vi->codec_setup;  vorbis_look_mapping0 *look=(vorbis_look_mapping0 *)_ogg_calloc(1,sizeof(*look));  vorbis_info_mapping0 *info=look->map=(vorbis_info_mapping0 *)m;  look->mode=vm;    look->floor_look=(vorbis_look_floor **)_ogg_calloc(info->submaps,sizeof(*look->floor_look));  look->residue_look=(vorbis_look_residue **)_ogg_calloc(info->submaps,sizeof(*look->residue_look));  look->floor_func=(vorbis_func_floor **)_ogg_calloc(info->submaps,sizeof(*look->floor_func));  look->residue_func=(vorbis_func_residue **)_ogg_calloc(info->submaps,sizeof(*look->residue_func));    for(i=0;i<info->submaps;i++){    int floornum=info->floorsubmap[i];    int resnum=info->residuesubmap[i];    look->floor_func[i]=_floor_P[ci->floor_type[floornum]];    look->floor_look[i]=look->floor_func[i]->      look(vd,vm,ci->floor_param[floornum]);    look->residue_func[i]=_residue_P[ci->residue_type[resnum]];    look->residue_look[i]=look->residue_func[i]->      look(vd,vm,ci->residue_param[resnum]);      }  look->ch=vi->channels;  return(look);}static int ilog(unsigned int v){  int ret=0;  if(v)--v;  while(v){    ret++;    v>>=1;  }  return(ret);}/* also responsible for range checking */static vorbis_info_mapping *mapping0_unpack(vorbis_info *vi,oggpack_buffer *opb){  int i;  vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)_ogg_calloc(1,sizeof(*info));  codec_setup_info     *ci=(codec_setup_info *)vi->codec_setup;  memset(info,0,sizeof(*info));  if(oggpack_read(opb,1))    info->submaps=oggpack_read(opb,4)+1;  else    info->submaps=1;  if(oggpack_read(opb,1)){    info->coupling_steps=oggpack_read(opb,8)+1;    for(i=0;i<info->coupling_steps;i++){      int testM=info->coupling_mag[i]=oggpack_read(opb,ilog(vi->channels));      int testA=info->coupling_ang[i]=oggpack_read(opb,ilog(vi->channels));      if(testM<0 || 	 testA<0 || 	 testM==testA || 	 testM>=vi->channels ||	 testA>=vi->channels) goto err_out;    }  }  if(oggpack_read(opb,2)>0)goto err_out; /* 2,3:reserved */      if(info->submaps>1){    for(i=0;i<vi->channels;i++){      info->chmuxlist[i]=oggpack_read(opb,4);      if(info->chmuxlist[i]>=info->submaps)goto err_out;    }  }  for(i=0;i<info->submaps;i++){    int temp=oggpack_read(opb,8);    if(temp>=ci->times)goto err_out;    info->floorsubmap[i]=oggpack_read(opb,8);    if(info->floorsubmap[i]>=ci->floors)goto err_out;    info->residuesubmap[i]=oggpack_read(opb,8);    if(info->residuesubmap[i]>=ci->residues)goto err_out;  }  return info; err_out:  mapping0_free_info(info);  return(NULL);}static int seq=0;static int mapping0_inverse(vorbis_block *vb,vorbis_look_mapping *l){  vorbis_dsp_state     *vd=vb->vd;  vorbis_info          *vi=vd->vi;  codec_setup_info     *ci=(codec_setup_info *)vi->codec_setup;  private_state        *b=(private_state *)vd->backend_state;  vorbis_look_mapping0 *look=(vorbis_look_mapping0 *)l;  vorbis_info_mapping0 *info=look->map;  int                   i,j;  long                  n=vb->pcmend=ci->blocksizes[vb->W];  ogg_int32_t **pcmbundle=(ogg_int32_t **)alloca(sizeof(*pcmbundle)*vi->channels);  int    *zerobundle=(int *)alloca(sizeof(*zerobundle)*vi->channels);    int   *nonzero  =(int *)alloca(sizeof(*nonzero)*vi->channels);  void **floormemo=(void **)alloca(sizeof(*floormemo)*vi->channels);    /* time domain information decode (note that applying the     information would have to happen later; we'll probably add a     function entry to the harness for that later */  /* NOT IMPLEMENTED */  /* recover the spectral envelope; store it in the PCM vector for now */  for(i=0;i<vi->channels;i++){    int submap=info->chmuxlist[i];    floormemo[i]=look->floor_func[submap]->      inverse1(vb,look->floor_look[submap]);    if(floormemo[i])      nonzero[i]=1;    else      nonzero[i]=0;          memset(vb->pcm[i],0,sizeof(*vb->pcm[i])*n/2);  }  /* channel coupling can 'dirty' the nonzero listing */  for(i=0;i<info->coupling_steps;i++){    if(nonzero[info->coupling_mag[i]] ||       nonzero[info->coupling_ang[i]]){      nonzero[info->coupling_mag[i]]=1;       nonzero[info->coupling_ang[i]]=1;     }  }  /* recover the residue into our working vectors */  for(i=0;i<info->submaps;i++){    int ch_in_bundle=0;    for(j=0;j<vi->channels;j++){      if(info->chmuxlist[j]==i){	if(nonzero[j])	  zerobundle[ch_in_bundle]=1;	else	  zerobundle[ch_in_bundle]=0;	pcmbundle[ch_in_bundle++]=vb->pcm[j];      }    }        look->residue_func[i]->inverse(vb,look->residue_look[i],				   pcmbundle,zerobundle,ch_in_bundle);  }  //for(j=0;j<vi->channels;j++)  //_analysis_output("coupled",seq+j,vb->pcm[j],-8,n/2,0,0);  /* channel coupling */  for(i=info->coupling_steps-1;i>=0;i--){    ogg_int32_t *pcmM=vb->pcm[info->coupling_mag[i]];    ogg_int32_t *pcmA=vb->pcm[info->coupling_ang[i]];        for(j=0;j<n/2;j++){      ogg_int32_t mag=pcmM[j];      ogg_int32_t ang=pcmA[j];            if(mag>0)	if(ang>0){	  pcmM[j]=mag;	  pcmA[j]=mag-ang;	}else{	  pcmA[j]=mag;	  pcmM[j]=mag+ang;	}      else	if(ang>0){	  pcmM[j]=mag;	  pcmA[j]=mag+ang;	}else{	  pcmA[j]=mag;	  pcmM[j]=mag-ang;	}    }  }  //for(j=0;j<vi->channels;j++)  //_analysis_output("residue",seq+j,vb->pcm[j],-8,n/2,0,0);  /* compute and apply spectral envelope */  for(i=0;i<vi->channels;i++){    ogg_int32_t *pcm=vb->pcm[i];    int submap=info->chmuxlist[i];    look->floor_func[submap]->      inverse2(vb,look->floor_look[submap],floormemo[i],pcm);  }  //for(j=0;j<vi->channels;j++)  //_analysis_output("mdct",seq+j,vb->pcm[j],-24,n/2,0,1);  /* transform the PCM data; takes PCM vector, vb; modifies PCM vector */  /* only MDCT right now.... */  for(i=0;i<vi->channels;i++){    ogg_int32_t *pcm=vb->pcm[i];    mdct_backward(n,pcm,pcm);  }  //for(j=0;j<vi->channels;j++)  //_analysis_output("imdct",seq+j,vb->pcm[j],-24,n,0,0);  /* window the data */  for(i=0;i<vi->channels;i++){    ogg_int32_t *pcm=vb->pcm[i];    if(nonzero[i])      _vorbis_apply_window(pcm,b->window,ci->blocksizes,vb->lW,vb->W,vb->nW);    else      for(j=0;j<n;j++)	pcm[j]=0;      }  //for(j=0;j<vi->channels;j++)  //_analysis_output("window",seq+j,vb->pcm[j],-24,n,0,0);  seq+=vi->channels;  /* all done! */  return(0);}/* export hooks */vorbis_func_mapping mapping0_exportbundle={  &mapping0_unpack,  &mapping0_look,  &mapping0_free_info,  &mapping0_free_look,  &mapping0_inverse};