comparison src/libvorbis-1.3.3/lib/mapping0.c @ 1:05aa0afa9217

Bring in flac, ogg, vorbis

+/********************************************************************
+ *                                                                  *
+ * THIS FILE IS PART OF THE OggVorbis SOFTWARE 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 SOURCE CODE IS (C) COPYRIGHT 1994-2010             *
+ * by the Xiph.Org Foundation http://www.xiph.org/                  *
+ *                                                                  *
+ ********************************************************************
+
+ function: channel mapping 0 implementation
+ last mod: $Id: mapping0.c 17022 2010-03-25 03:45:42Z xiphmont $
+
+ ********************************************************************/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <ogg/ogg.h>
+#include "vorbis/codec.h"
+#include "codec_internal.h"
+#include "codebook.h"
+#include "window.h"
+#include "registry.h"
+#include "psy.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 */
+
+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 int ilog(unsigned int v){
+  int ret=0;
+  if(v)--v;
+  while(v){
+    ret++;
+    v>>=1;
+  }
+  return(ret);
+}
+
+static void mapping0_pack(vorbis_info *vi,vorbis_info_mapping *vm,
+                          oggpack_buffer *opb){
+  int i;
+  vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)vm;
+
+  /* another 'we meant to do it this way' hack...  up to beta 4, we
+     packed 4 binary zeros here to signify one submapping in use.  We
+     now redefine that to mean four bitflags that indicate use of
+     deeper features; bit0:submappings, bit1:coupling,
+     bit2,3:reserved. This is backward compatable with all actual uses
+     of the beta code. */
+
+  if(info->submaps>1){
+    oggpack_write(opb,1,1);
+    oggpack_write(opb,info->submaps-1,4);
+  }else
+    oggpack_write(opb,0,1);
+
+  if(info->coupling_steps>0){
+    oggpack_write(opb,1,1);
+    oggpack_write(opb,info->coupling_steps-1,8);
+
+    for(i=0;i<info->coupling_steps;i++){
+      oggpack_write(opb,info->coupling_mag[i],ilog(vi->channels));
+      oggpack_write(opb,info->coupling_ang[i],ilog(vi->channels));
+    }
+  }else
+    oggpack_write(opb,0,1);
+
+  oggpack_write(opb,0,2); /* 2,3:reserved */
+
+  /* we don't write the channel submappings if we only have one... */
+  if(info->submaps>1){
+    for(i=0;i<vi->channels;i++)
+      oggpack_write(opb,info->chmuxlist[i],4);
+  }
+  for(i=0;i<info->submaps;i++){
+    oggpack_write(opb,0,8); /* time submap unused */
+    oggpack_write(opb,info->floorsubmap[i],8);
+    oggpack_write(opb,info->residuesubmap[i],8);
+  }
+}
+
+/* also responsible for range checking */
+static vorbis_info_mapping *mapping0_unpack(vorbis_info *vi,oggpack_buffer *opb){
+  int i,b;
+  vorbis_info_mapping0 *info=_ogg_calloc(1,sizeof(*info));
+  codec_setup_info     *ci=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++){
+    oggpack_read(opb,8); /* time submap unused */
+    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);
+}
+
+#include "os.h"
+#include "lpc.h"
+#include "lsp.h"
+#include "envelope.h"
+#include "mdct.h"
+#include "psy.h"
+#include "scales.h"
+
+#if 0
+static long seq=0;
+static ogg_int64_t total=0;
+static float FLOOR1_fromdB_LOOKUP[256]={
+  1.0649863e-07F, 1.1341951e-07F, 1.2079015e-07F, 1.2863978e-07F,
+  1.3699951e-07F, 1.4590251e-07F, 1.5538408e-07F, 1.6548181e-07F,
+  1.7623575e-07F, 1.8768855e-07F, 1.9988561e-07F, 2.128753e-07F,
+  2.2670913e-07F, 2.4144197e-07F, 2.5713223e-07F, 2.7384213e-07F,
+  2.9163793e-07F, 3.1059021e-07F, 3.3077411e-07F, 3.5226968e-07F,
+  3.7516214e-07F, 3.9954229e-07F, 4.2550680e-07F, 4.5315863e-07F,
+  4.8260743e-07F, 5.1396998e-07F, 5.4737065e-07F, 5.8294187e-07F,
+  6.2082472e-07F, 6.6116941e-07F, 7.0413592e-07F, 7.4989464e-07F,
+  7.9862701e-07F, 8.5052630e-07F, 9.0579828e-07F, 9.6466216e-07F,
+  1.0273513e-06F, 1.0941144e-06F, 1.1652161e-06F, 1.2409384e-06F,
+  1.3215816e-06F, 1.4074654e-06F, 1.4989305e-06F, 1.5963394e-06F,
+  1.7000785e-06F, 1.8105592e-06F, 1.9282195e-06F, 2.0535261e-06F,
+  2.1869758e-06F, 2.3290978e-06F, 2.4804557e-06F, 2.6416497e-06F,
+  2.8133190e-06F, 2.9961443e-06F, 3.1908506e-06F, 3.3982101e-06F,
+  3.6190449e-06F, 3.8542308e-06F, 4.1047004e-06F, 4.3714470e-06F,
+  4.6555282e-06F, 4.9580707e-06F, 5.2802740e-06F, 5.6234160e-06F,
+  5.9888572e-06F, 6.3780469e-06F, 6.7925283e-06F, 7.2339451e-06F,
+  7.7040476e-06F, 8.2047000e-06F, 8.7378876e-06F, 9.3057248e-06F,
+  9.9104632e-06F, 1.0554501e-05F, 1.1240392e-05F, 1.1970856e-05F,
+  1.2748789e-05F, 1.3577278e-05F, 1.4459606e-05F, 1.5399272e-05F,
+  1.6400004e-05F, 1.7465768e-05F, 1.8600792e-05F, 1.9809576e-05F,
+  2.1096914e-05F, 2.2467911e-05F, 2.3928002e-05F, 2.5482978e-05F,
+  2.7139006e-05F, 2.8902651e-05F, 3.0780908e-05F, 3.2781225e-05F,
+  3.4911534e-05F, 3.7180282e-05F, 3.9596466e-05F, 4.2169667e-05F,
+  4.4910090e-05F, 4.7828601e-05F, 5.0936773e-05F, 5.4246931e-05F,
+  5.7772202e-05F, 6.1526565e-05F, 6.5524908e-05F, 6.9783085e-05F,
+  7.4317983e-05F, 7.9147585e-05F, 8.4291040e-05F, 8.9768747e-05F,
+  9.5602426e-05F, 0.00010181521F, 0.00010843174F, 0.00011547824F,
+  0.00012298267F, 0.00013097477F, 0.00013948625F, 0.00014855085F,
+  0.00015820453F, 0.00016848555F, 0.00017943469F, 0.00019109536F,
+  0.00020351382F, 0.00021673929F, 0.00023082423F, 0.00024582449F,
+  0.00026179955F, 0.00027881276F, 0.00029693158F, 0.00031622787F,
+  0.00033677814F, 0.00035866388F, 0.00038197188F, 0.00040679456F,
+  0.00043323036F, 0.00046138411F, 0.00049136745F, 0.00052329927F,
+  0.00055730621F, 0.00059352311F, 0.00063209358F, 0.00067317058F,
+  0.00071691700F, 0.00076350630F, 0.00081312324F, 0.00086596457F,
+  0.00092223983F, 0.00098217216F, 0.0010459992F, 0.0011139742F,
+  0.0011863665F, 0.0012634633F, 0.0013455702F, 0.0014330129F,
+  0.0015261382F, 0.0016253153F, 0.0017309374F, 0.0018434235F,
+  0.0019632195F, 0.0020908006F, 0.0022266726F, 0.0023713743F,
+  0.0025254795F, 0.0026895994F, 0.0028643847F, 0.0030505286F,
+  0.0032487691F, 0.0034598925F, 0.0036847358F, 0.0039241906F,
+  0.0041792066F, 0.0044507950F, 0.0047400328F, 0.0050480668F,
+  0.0053761186F, 0.0057254891F, 0.0060975636F, 0.0064938176F,
+  0.0069158225F, 0.0073652516F, 0.0078438871F, 0.0083536271F,
+  0.0088964928F, 0.009474637F, 0.010090352F, 0.010746080F,
+  0.011444421F, 0.012188144F, 0.012980198F, 0.013823725F,
+  0.014722068F, 0.015678791F, 0.016697687F, 0.017782797F,
+  0.018938423F, 0.020169149F, 0.021479854F, 0.022875735F,
+  0.024362330F, 0.025945531F, 0.027631618F, 0.029427276F,
+  0.031339626F, 0.033376252F, 0.035545228F, 0.037855157F,
+  0.040315199F, 0.042935108F, 0.045725273F, 0.048696758F,
+  0.051861348F, 0.055231591F, 0.058820850F, 0.062643361F,
+  0.066714279F, 0.071049749F, 0.075666962F, 0.080584227F,
+  0.085821044F, 0.091398179F, 0.097337747F, 0.10366330F,
+  0.11039993F, 0.11757434F, 0.12521498F, 0.13335215F,
+  0.14201813F, 0.15124727F, 0.16107617F, 0.17154380F,
+  0.18269168F, 0.19456402F, 0.20720788F, 0.22067342F,
+  0.23501402F, 0.25028656F, 0.26655159F, 0.28387361F,
+  0.30232132F, 0.32196786F, 0.34289114F, 0.36517414F,
+  0.38890521F, 0.41417847F, 0.44109412F, 0.46975890F,
+  0.50028648F, 0.53279791F, 0.56742212F, 0.60429640F,
+  0.64356699F, 0.68538959F, 0.72993007F, 0.77736504F,
+  0.82788260F, 0.88168307F, 0.9389798F, 1.F,
+};
+
+#endif
+
+
+static int mapping0_forward(vorbis_block *vb){
+  vorbis_dsp_state      *vd=vb->vd;
+  vorbis_info           *vi=vd->vi;
+  codec_setup_info      *ci=vi->codec_setup;
+  private_state         *b=vb->vd->backend_state;
+  vorbis_block_internal *vbi=(vorbis_block_internal *)vb->internal;
+  int                    n=vb->pcmend;
+  int i,j,k;
+
+  int    *nonzero    = alloca(sizeof(*nonzero)*vi->channels);
+  float  **gmdct     = _vorbis_block_alloc(vb,vi->channels*sizeof(*gmdct));
+  int    **iwork      = _vorbis_block_alloc(vb,vi->channels*sizeof(*iwork));
+  int ***floor_posts = _vorbis_block_alloc(vb,vi->channels*sizeof(*floor_posts));
+
+  float global_ampmax=vbi->ampmax;
+  float *local_ampmax=alloca(sizeof(*local_ampmax)*vi->channels);
+  int blocktype=vbi->blocktype;
+
+  int modenumber=vb->W;
+  vorbis_info_mapping0 *info=ci->map_param[modenumber];
+  vorbis_look_psy *psy_look=b->psy+blocktype+(vb->W?2:0);
+
+  vb->mode=modenumber;
+
+  for(i=0;i<vi->channels;i++){
+    float scale=4.f/n;
+    float scale_dB;
+
+    float *pcm     =vb->pcm[i];
+    float *logfft  =pcm;
+
+    iwork[i]=_vorbis_block_alloc(vb,n/2*sizeof(**iwork));
+    gmdct[i]=_vorbis_block_alloc(vb,n/2*sizeof(**gmdct));
+
+    scale_dB=todB(&scale) + .345; /* + .345 is a hack; the original
+                                     todB estimation used on IEEE 754
+                                     compliant machines had a bug that
+                                     returned dB values about a third
+                                     of a decibel too high.  The bug
+                                     was harmless because tunings
+                                     implicitly took that into
+                                     account.  However, fixing the bug
+                                     in the estimator requires
+                                     changing all the tunings as well.
+                                     For now, it's easier to sync
+                                     things back up here, and
+                                     recalibrate the tunings in the
+                                     next major model upgrade. */
+
+#if 0
+    if(vi->channels==2){
+      if(i==0)
+        _analysis_output("pcmL",seq,pcm,n,0,0,total-n/2);
+      else
+        _analysis_output("pcmR",seq,pcm,n,0,0,total-n/2);
+    }else{
+      _analysis_output("pcm",seq,pcm,n,0,0,total-n/2);
+    }
+#endif
+
+    /* window the PCM data */
+    _vorbis_apply_window(pcm,b->window,ci->blocksizes,vb->lW,vb->W,vb->nW);
+
+#if 0
+    if(vi->channels==2){
+      if(i==0)
+        _analysis_output("windowedL",seq,pcm,n,0,0,total-n/2);
+      else
+        _analysis_output("windowedR",seq,pcm,n,0,0,total-n/2);
+    }else{
+      _analysis_output("windowed",seq,pcm,n,0,0,total-n/2);
+    }
+#endif
+
+    /* transform the PCM data */
+    /* only MDCT right now.... */
+    mdct_forward(b->transform[vb->W][0],pcm,gmdct[i]);
+
+    /* FFT yields more accurate tonal estimation (not phase sensitive) */
+    drft_forward(&b->fft_look[vb->W],pcm);
+    logfft[0]=scale_dB+todB(pcm)  + .345; /* + .345 is a hack; the
+                                     original todB estimation used on
+                                     IEEE 754 compliant machines had a
+                                     bug that returned dB values about
+                                     a third of a decibel too high.
+                                     The bug was harmless because
+                                     tunings implicitly took that into
+                                     account.  However, fixing the bug
+                                     in the estimator requires
+                                     changing all the tunings as well.
+                                     For now, it's easier to sync
+                                     things back up here, and
+                                     recalibrate the tunings in the
+                                     next major model upgrade. */
+    local_ampmax[i]=logfft[0];
+    for(j=1;j<n-1;j+=2){
+      float temp=pcm[j]*pcm[j]+pcm[j+1]*pcm[j+1];
+      temp=logfft[(j+1)>>1]=scale_dB+.5f*todB(&temp)  + .345; /* +
+                                     .345 is a hack; the original todB
+                                     estimation used on IEEE 754
+                                     compliant machines had a bug that
+                                     returned dB values about a third
+                                     of a decibel too high.  The bug
+                                     was harmless because tunings
+                                     implicitly took that into
+                                     account.  However, fixing the bug
+                                     in the estimator requires
+                                     changing all the tunings as well.
+                                     For now, it's easier to sync
+                                     things back up here, and
+                                     recalibrate the tunings in the
+                                     next major model upgrade. */
+      if(temp>local_ampmax[i])local_ampmax[i]=temp;
+    }
+
+    if(local_ampmax[i]>0.f)local_ampmax[i]=0.f;
+    if(local_ampmax[i]>global_ampmax)global_ampmax=local_ampmax[i];
+
+#if 0
+    if(vi->channels==2){
+      if(i==0){
+        _analysis_output("fftL",seq,logfft,n/2,1,0,0);
+      }else{
+        _analysis_output("fftR",seq,logfft,n/2,1,0,0);
+      }
+    }else{
+      _analysis_output("fft",seq,logfft,n/2,1,0,0);
+    }
+#endif
+
+  }
+
+  {
+    float   *noise        = _vorbis_block_alloc(vb,n/2*sizeof(*noise));
+    float   *tone         = _vorbis_block_alloc(vb,n/2*sizeof(*tone));
+
+    for(i=0;i<vi->channels;i++){
+      /* the encoder setup assumes that all the modes used by any
+         specific bitrate tweaking use the same floor */
+
+      int submap=info->chmuxlist[i];
+
+      /* the following makes things clearer to *me* anyway */
+      float *mdct    =gmdct[i];
+      float *logfft  =vb->pcm[i];
+
+      float *logmdct =logfft+n/2;
+      float *logmask =logfft;
+
+      vb->mode=modenumber;
+
+      floor_posts[i]=_vorbis_block_alloc(vb,PACKETBLOBS*sizeof(**floor_posts));
+      memset(floor_posts[i],0,sizeof(**floor_posts)*PACKETBLOBS);
+
+      for(j=0;j<n/2;j++)
+        logmdct[j]=todB(mdct+j)  + .345; /* + .345 is a hack; the original
+                                     todB estimation used on IEEE 754
+                                     compliant machines had a bug that
+                                     returned dB values about a third
+                                     of a decibel too high.  The bug
+                                     was harmless because tunings
+                                     implicitly took that into
+                                     account.  However, fixing the bug
+                                     in the estimator requires
+                                     changing all the tunings as well.
+                                     For now, it's easier to sync
+                                     things back up here, and
+                                     recalibrate the tunings in the
+                                     next major model upgrade. */
+
+#if 0
+      if(vi->channels==2){
+        if(i==0)
+          _analysis_output("mdctL",seq,logmdct,n/2,1,0,0);
+        else
+          _analysis_output("mdctR",seq,logmdct,n/2,1,0,0);
+      }else{
+        _analysis_output("mdct",seq,logmdct,n/2,1,0,0);
+      }
+#endif
+
+      /* first step; noise masking.  Not only does 'noise masking'
+         give us curves from which we can decide how much resolution
+         to give noise parts of the spectrum, it also implicitly hands
+         us a tonality estimate (the larger the value in the
+         'noise_depth' vector, the more tonal that area is) */
+
+      _vp_noisemask(psy_look,
+                    logmdct,
+                    noise); /* noise does not have by-frequency offset
+                               bias applied yet */
+#if 0
+      if(vi->channels==2){
+        if(i==0)
+          _analysis_output("noiseL",seq,noise,n/2,1,0,0);
+        else
+          _analysis_output("noiseR",seq,noise,n/2,1,0,0);
+      }else{
+        _analysis_output("noise",seq,noise,n/2,1,0,0);
+      }
+#endif
+
+      /* second step: 'all the other crap'; all the stuff that isn't
+         computed/fit for bitrate management goes in the second psy
+         vector.  This includes tone masking, peak limiting and ATH */
+
+      _vp_tonemask(psy_look,
+                   logfft,
+                   tone,
+                   global_ampmax,
+                   local_ampmax[i]);
+
+#if 0
+      if(vi->channels==2){
+        if(i==0)
+          _analysis_output("toneL",seq,tone,n/2,1,0,0);
+        else
+          _analysis_output("toneR",seq,tone,n/2,1,0,0);
+      }else{
+        _analysis_output("tone",seq,tone,n/2,1,0,0);
+      }
+#endif
+
+      /* third step; we offset the noise vectors, overlay tone
+         masking.  We then do a floor1-specific line fit.  If we're
+         performing bitrate management, the line fit is performed
+         multiple times for up/down tweakage on demand. */
+
+#if 0
+      {
+      float aotuv[psy_look->n];
+#endif
+
+        _vp_offset_and_mix(psy_look,
+                           noise,
+                           tone,
+                           1,
+                           logmask,
+                           mdct,
+                           logmdct);
+
+#if 0
+        if(vi->channels==2){
+          if(i==0)
+            _analysis_output("aotuvM1_L",seq,aotuv,psy_look->n,1,1,0);
+          else
+            _analysis_output("aotuvM1_R",seq,aotuv,psy_look->n,1,1,0);
+        }else{
+          _analysis_output("aotuvM1",seq,aotuv,psy_look->n,1,1,0);
+        }
+      }
+#endif
+
+
+#if 0
+      if(vi->channels==2){
+        if(i==0)
+          _analysis_output("mask1L",seq,logmask,n/2,1,0,0);
+        else
+          _analysis_output("mask1R",seq,logmask,n/2,1,0,0);
+      }else{
+        _analysis_output("mask1",seq,logmask,n/2,1,0,0);
+      }
+#endif
+
+      /* this algorithm is hardwired to floor 1 for now; abort out if
+         we're *not* floor1.  This won't happen unless someone has
+         broken the encode setup lib.  Guard it anyway. */
+      if(ci->floor_type[info->floorsubmap[submap]]!=1)return(-1);
+
+      floor_posts[i][PACKETBLOBS/2]=
+        floor1_fit(vb,b->flr[info->floorsubmap[submap]],
+                   logmdct,
+                   logmask);
+
+      /* are we managing bitrate?  If so, perform two more fits for
+         later rate tweaking (fits represent hi/lo) */
+      if(vorbis_bitrate_managed(vb) && floor_posts[i][PACKETBLOBS/2]){
+        /* higher rate by way of lower noise curve */
+
+        _vp_offset_and_mix(psy_look,
+                           noise,
+                           tone,
+                           2,
+                           logmask,
+                           mdct,
+                           logmdct);
+
+#if 0
+        if(vi->channels==2){
+          if(i==0)
+            _analysis_output("mask2L",seq,logmask,n/2,1,0,0);
+          else
+            _analysis_output("mask2R",seq,logmask,n/2,1,0,0);
+        }else{
+          _analysis_output("mask2",seq,logmask,n/2,1,0,0);
+        }
+#endif
+
+        floor_posts[i][PACKETBLOBS-1]=
+          floor1_fit(vb,b->flr[info->floorsubmap[submap]],
+                     logmdct,
+                     logmask);
+
+        /* lower rate by way of higher noise curve */
+        _vp_offset_and_mix(psy_look,
+                           noise,
+                           tone,
+                           0,
+                           logmask,
+                           mdct,
+                           logmdct);
+
+#if 0
+        if(vi->channels==2){
+          if(i==0)
+            _analysis_output("mask0L",seq,logmask,n/2,1,0,0);
+          else
+            _analysis_output("mask0R",seq,logmask,n/2,1,0,0);
+        }else{
+          _analysis_output("mask0",seq,logmask,n/2,1,0,0);
+        }
+#endif
+
+        floor_posts[i][0]=
+          floor1_fit(vb,b->flr[info->floorsubmap[submap]],
+                     logmdct,
+                     logmask);
+
+        /* we also interpolate a range of intermediate curves for
+           intermediate rates */
+        for(k=1;k<PACKETBLOBS/2;k++)
+          floor_posts[i][k]=
+            floor1_interpolate_fit(vb,b->flr[info->floorsubmap[submap]],
+                                   floor_posts[i][0],
+                                   floor_posts[i][PACKETBLOBS/2],
+                                   k*65536/(PACKETBLOBS/2));
+        for(k=PACKETBLOBS/2+1;k<PACKETBLOBS-1;k++)
+          floor_posts[i][k]=
+            floor1_interpolate_fit(vb,b->flr[info->floorsubmap[submap]],
+                                   floor_posts[i][PACKETBLOBS/2],
+                                   floor_posts[i][PACKETBLOBS-1],
+                                   (k-PACKETBLOBS/2)*65536/(PACKETBLOBS/2));
+      }
+    }
+  }
+  vbi->ampmax=global_ampmax;
+
+  /*
+    the next phases are performed once for vbr-only and PACKETBLOB
+    times for bitrate managed modes.
+
+    1) encode actual mode being used
+    2) encode the floor for each channel, compute coded mask curve/res
+    3) normalize and couple.
+    4) encode residue
+    5) save packet bytes to the packetblob vector
+
+  */
+
+  /* iterate over the many masking curve fits we've created */
+
+  {
+    int **couple_bundle=alloca(sizeof(*couple_bundle)*vi->channels);
+    int *zerobundle=alloca(sizeof(*zerobundle)*vi->channels);
+
+    for(k=(vorbis_bitrate_managed(vb)?0:PACKETBLOBS/2);
+        k<=(vorbis_bitrate_managed(vb)?PACKETBLOBS-1:PACKETBLOBS/2);
+        k++){
+      oggpack_buffer *opb=vbi->packetblob[k];
+
+      /* start out our new packet blob with packet type and mode */
+      /* Encode the packet type */
+      oggpack_write(opb,0,1);
+      /* Encode the modenumber */
+      /* Encode frame mode, pre,post windowsize, then dispatch */
+      oggpack_write(opb,modenumber,b->modebits);
+      if(vb->W){
+        oggpack_write(opb,vb->lW,1);
+        oggpack_write(opb,vb->nW,1);
+      }
+
+      /* encode floor, compute masking curve, sep out residue */
+      for(i=0;i<vi->channels;i++){
+        int submap=info->chmuxlist[i];
+        int *ilogmask=iwork[i];
+
+        nonzero[i]=floor1_encode(opb,vb,b->flr[info->floorsubmap[submap]],
+                                 floor_posts[i][k],
+                                 ilogmask);
+#if 0
+        {
+          char buf[80];
+          sprintf(buf,"maskI%c%d",i?'R':'L',k);
+          float work[n/2];
+          for(j=0;j<n/2;j++)
+            work[j]=FLOOR1_fromdB_LOOKUP[iwork[i][j]];
+          _analysis_output(buf,seq,work,n/2,1,1,0);
+        }
+#endif
+      }
+
+      /* our iteration is now based on masking curve, not prequant and
+         coupling.  Only one prequant/coupling step */
+
+      /* quantize/couple */
+      /* incomplete implementation that assumes the tree is all depth
+         one, or no tree at all */
+      _vp_couple_quantize_normalize(k,
+                                    &ci->psy_g_param,
+                                    psy_look,
+                                    info,
+                                    gmdct,
+                                    iwork,
+                                    nonzero,
+                                    ci->psy_g_param.sliding_lowpass[vb->W][k],
+                                    vi->channels);
+
+#if 0
+      for(i=0;i<vi->channels;i++){
+        char buf[80];
+        sprintf(buf,"res%c%d",i?'R':'L',k);
+        float work[n/2];
+        for(j=0;j<n/2;j++)
+          work[j]=iwork[i][j];
+        _analysis_output(buf,seq,work,n/2,1,0,0);
+      }
+#endif
+
+      /* classify and encode by submap */
+      for(i=0;i<info->submaps;i++){
+        int ch_in_bundle=0;
+        long **classifications;
+        int resnum=info->residuesubmap[i];
+
+        for(j=0;j<vi->channels;j++){
+          if(info->chmuxlist[j]==i){
+            zerobundle[ch_in_bundle]=0;
+            if(nonzero[j])zerobundle[ch_in_bundle]=1;
+            couple_bundle[ch_in_bundle++]=iwork[j];
+          }
+        }
+
+        classifications=_residue_P[ci->residue_type[resnum]]->
+          class(vb,b->residue[resnum],couple_bundle,zerobundle,ch_in_bundle);
+
+        ch_in_bundle=0;
+        for(j=0;j<vi->channels;j++)
+          if(info->chmuxlist[j]==i)
+            couple_bundle[ch_in_bundle++]=iwork[j];
+
+        _residue_P[ci->residue_type[resnum]]->
+          forward(opb,vb,b->residue[resnum],
+                  couple_bundle,zerobundle,ch_in_bundle,classifications,i);
+      }
+
+      /* ok, done encoding.  Next protopacket. */
+    }
+
+  }
+
+#if 0
+  seq++;
+  total+=ci->blocksizes[vb->W]/4+ci->blocksizes[vb->nW]/4;
+#endif
+  return(0);
+}
+
+static int mapping0_inverse(vorbis_block *vb,vorbis_info_mapping *l){
+  vorbis_dsp_state     *vd=vb->vd;
+  vorbis_info          *vi=vd->vi;
+  codec_setup_info     *ci=vi->codec_setup;
+  private_state        *b=vd->backend_state;
+  vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)l;
+
+  int                   i,j;
+  long                  n=vb->pcmend=ci->blocksizes[vb->W];
+
+  float **pcmbundle=alloca(sizeof(*pcmbundle)*vi->channels);
+  int    *zerobundle=alloca(sizeof(*zerobundle)*vi->channels);
+
+  int   *nonzero  =alloca(sizeof(*nonzero)*vi->channels);
+  void **floormemo=alloca(sizeof(*floormemo)*vi->channels);
+
+  /* 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]=_floor_P[ci->floor_type[info->floorsubmap[submap]]]->
+      inverse1(vb,b->flr[info->floorsubmap[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];
+      }
+    }
+
+    _residue_P[ci->residue_type[info->residuesubmap[i]]]->
+      inverse(vb,b->residue[info->residuesubmap[i]],
+              pcmbundle,zerobundle,ch_in_bundle);
+  }
+
+  /* channel coupling */
+  for(i=info->coupling_steps-1;i>=0;i--){
+    float *pcmM=vb->pcm[info->coupling_mag[i]];
+    float *pcmA=vb->pcm[info->coupling_ang[i]];
+
+    for(j=0;j<n/2;j++){
+      float mag=pcmM[j];
+      float 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;
+        }
+    }
+  }
+
+  /* compute and apply spectral envelope */
+  for(i=0;i<vi->channels;i++){
+    float *pcm=vb->pcm[i];
+    int submap=info->chmuxlist[i];
+    _floor_P[ci->floor_type[info->floorsubmap[submap]]]->
+      inverse2(vb,b->flr[info->floorsubmap[submap]],
+               floormemo[i],pcm);
+  }
+
+  /* transform the PCM data; takes PCM vector, vb; modifies PCM vector */
+  /* only MDCT right now.... */
+  for(i=0;i<vi->channels;i++){
+    float *pcm=vb->pcm[i];
+    mdct_backward(b->transform[vb->W][0],pcm,pcm);
+  }
+
+  /* all done! */
+  return(0);
+}
+
+/* export hooks */
+const vorbis_func_mapping mapping0_exportbundle={
+  &mapping0_pack,
+  &mapping0_unpack,
+  &mapping0_free_info,
+  &mapping0_forward,
+  &mapping0_inverse
+};