diff -r e353ca78d28b -r f7e49eff3708 misc/libtremor/mapping0.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libtremor/mapping0.c	Sun Apr 24 22:57:57 2011 +0200
@@ -0,0 +1,322 @@
+/********************************************************************
+ *                                                                  *
+ * 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
+};