--- /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
+};