The Tor Browser: media/libtremor/lib/tremor_mapping0.c@6474c204b198 (annotated)

media/libtremor/lib/tremor_mapping0.c@6474c204b198 (annotated)

media/libtremor/lib/tremor_mapping0.c

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /********************************************************************
  *                                                                  *
  * 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/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,b;
   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));
   b=oggpack_read(opb,1);
   if(b<0)goto err_out;
   if(b){
     info->submaps=oggpack_read(opb,4)+1;
     if(info->submaps<=0)goto err_out;
   }else
     info->submaps=1;
   b=oggpack_read(opb,1);
   if(b<0)goto err_out;
   if(b){
     info->coupling_steps=oggpack_read(opb,8)+1;
     if(info->coupling_steps<=0)goto err_out;
     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 || info->chmuxlist[i]<0)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 || info->floorsubmap[i]<0)goto err_out;
     info->residuesubmap[i]=oggpack_read(opb,8);
     if(info->residuesubmap[i]>=ci->residues || info->residuesubmap[i]<0)
       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
 };

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media/libtremor/lib/tremor_mapping0.c@6474c204b198 (annotated)

media/libtremor/lib/tremor_mapping0.c