Quelle  vorbisenc.c   Sprache: C

/********************************************************************
 *                                                                  *
 * 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 1994-2015             *
 * by the Xiph.Org Foundation https://xiph.org/                     *
 *                                                                  *
 ********************************************************************

 function: simple programmatic interface for encoder mode setup

 ********************************************************************/

#include <stdlib.h>
#include <string.h>
#include <math.h>

#include "vorbis/codec.h"
#include "vorbis/vorbisenc.h"

#include "codec_internal.h"

#include "os.h"
#include "misc.h"

/* careful with this; it's using static array sizing to make managing
   all the modes a little less annoying.  If we use a residue backend
   with > 12 partition types, or a different division of iteration,
   this needs to be updated. */
typedef struct {
  const static_codebook *books[12][4];
} static_bookblock;

typedef struct {
  int res_type;
  int limit_type; /* 0 lowpass limited, 1 point stereo limited */
  int grouping;
  const vorbis_info_residue0 *res;
  const static_codebook  *book_aux;
  const static_codebook  *book_aux_managed;
  const static_bookblock *books_base;
  const static_bookblock *books_base_managed;
} vorbis_residue_template;

typedef struct {
  const vorbis_info_mapping0    *map;
  const vorbis_residue_template *res;
} vorbis_mapping_template;

typedef struct vp_adjblock{
  int block[P_BANDS];
} vp_adjblock;

typedef struct {
  int data[NOISE_COMPAND_LEVELS];
} compandblock;

/* high level configuration information for setting things up
   step-by-step with the detailed vorbis_encode_ctl interface.
   There's a fair amount of redundancy such that interactive setup
   does not directly deal with any vorbis_info or codec_setup_info
   initialization; it's all stored (until full init) in this highlevel
   setup, then flushed out to the real codec setup structs later. */

typedef struct {
  int att[P_NOISECURVES];
  float boost;
  float decay;
} att3;
typedef struct { int data[P_NOISECURVES]; } adj3;

typedef struct {
  int   pre[PACKETBLOBS];
  int   post[PACKETBLOBS];
  float kHz[PACKETBLOBS];
  float lowpasskHz[PACKETBLOBS];
} adj_stereo;

typedef struct {
  int lo;
  int hi;
  int fixed;
} noiseguard;
typedef struct {
  int data[P_NOISECURVES][17];
} noise3;

typedef struct {
  int      mappings;
  const double  *rate_mapping;
  const double  *quality_mapping;
  int      coupling_restriction;
  long     samplerate_min_restriction;
  long     samplerate_max_restriction;


  const int     *blocksize_short;
  const int     *blocksize_long;

  const att3    *psy_tone_masteratt;
  const int     *psy_tone_0dB;
  const int     *psy_tone_dBsuppress;

  const vp_adjblock *psy_tone_adj_impulse;
  const vp_adjblock *psy_tone_adj_long;
  const vp_adjblock *psy_tone_adj_other;

  const noiseguard  *psy_noiseguards;
  const noise3      *psy_noise_bias_impulse;
  const noise3      *psy_noise_bias_padding;
  const noise3      *psy_noise_bias_trans;
  const noise3      *psy_noise_bias_long;
  const int         *psy_noise_dBsuppress;

  const compandblock  *psy_noise_compand;
  const double        *psy_noise_compand_short_mapping;
  const double        *psy_noise_compand_long_mapping;

  const int      *psy_noise_normal_start[2];
  const int      *psy_noise_normal_partition[2];
  const double   *psy_noise_normal_thresh;

  const int      *psy_ath_float;
  const int      *psy_ath_abs;

  const double   *psy_lowpass;

  const vorbis_info_psy_global *global_params;
  const double     *global_mapping;
  const adj_stereo *stereo_modes;

  const static_codebook *const *const *const floor_books;
  const vorbis_info_floor1 *floor_params;
  const int floor_mappings;
  const int **floor_mapping_list;

  const vorbis_mapping_template *maps;
} ve_setup_data_template;

/* a few static coder conventions */
static const vorbis_info_mode _mode_template[2]={
  {0,0,0,0},
  {1,0,0,1}
};

static const vorbis_info_mapping0 _map_nominal[2]={
  {1, {0,0}, {0}, {0}, 1,{0},{1}},
  {1, {0,0}, {1}, {1}, 1,{0},{1}}
};

#include "modes/setup_44.h"
#include "modes/setup_44u.h"
#include "modes/setup_44p51.h"
#include "modes/setup_32.h"
#include "modes/setup_8.h"
#include "modes/setup_11.h"
#include "modes/setup_16.h"
#include "modes/setup_22.h"
#include "modes/setup_X.h"

static const ve_setup_data_template *const setup_list[]={
  &ve_setup_44_stereo,
  &ve_setup_44_51,
  &ve_setup_44_uncoupled,

  &ve_setup_32_stereo,
  &ve_setup_32_uncoupled,

  &ve_setup_22_stereo,
  &ve_setup_22_uncoupled,
  &ve_setup_16_stereo,
  &ve_setup_16_uncoupled,

  &ve_setup_11_stereo,
  &ve_setup_11_uncoupled,
  &ve_setup_8_stereo,
  &ve_setup_8_uncoupled,

  &ve_setup_X_stereo,
  &ve_setup_X_uncoupled,
  &ve_setup_XX_stereo,
  &ve_setup_XX_uncoupled,
  0
};

static void vorbis_encode_floor_setup(vorbis_info *vi,int s,
                                     const static_codebook *const *const *const books,
                                     const vorbis_info_floor1 *in,
                                     const int *x){
  int i,k,is=s;
  vorbis_info_floor1 *f=_ogg_calloc(1,sizeof(*f));
  codec_setup_info *ci=vi->codec_setup;

  memcpy(f,in+x[is],sizeof(*f));

  /* books */
  {
    int partitions=f->partitions;
    int maxclass=-1;
    int maxbook=-1;
    for(i=0;i<partitions;i++)
      if(f->partitionclass[i]>maxclass)maxclass=f->partitionclass[i];
    for(i=0;i<=maxclass;i++){
      if(f->class_book[i]>maxbook)maxbook=f->class_book[i];
      f->class_book[i]+=ci->books;
      for(k=0;k<(1<<f->class_subs[i]);k++){
        if(f->class_subbook[i][k]>maxbook)maxbook=f->class_subbook[i][k];
        if(f->class_subbook[i][k]>=0)f->class_subbook[i][k]+=ci->books;
      }
    }

    for(i=0;i<=maxbook;i++)
      ci->book_param[ci->books++]=(static_codebook *)books[x[is]][i];
  }

  /* for now, we're only using floor 1 */
  ci->floor_type[ci->floors]=1;
  ci->floor_param[ci->floors]=f;
  ci->floors++;

  return;
}

static void vorbis_encode_global_psych_setup(vorbis_info *vi,double s,
                                            const vorbis_info_psy_global *in,
                                            const double *x){
  int i,is=s;
  double ds=s-is;
  codec_setup_info *ci=vi->codec_setup;
  vorbis_info_psy_global *g=&ci->psy_g_param;

  memcpy(g,in+(int)x[is],sizeof(*g));

  ds=x[is]*(1.-ds)+x[is+1]*ds;
  is=(int)ds;
  ds-=is;
  if(ds==0 && is>0){
    is--;
    ds=1.;
  }

  /* interpolate the trigger threshholds */
  for(i=0;i<4;i++){
    g->preecho_thresh[i]=in[is].preecho_thresh[i]*(1.-ds)+in[is+1].preecho_thresh[i]*ds;
    g->postecho_thresh[i]=in[is].postecho_thresh[i]*(1.-ds)+in[is+1].postecho_thresh[i]*ds;
  }
  g->ampmax_att_per_sec=ci->hi.amplitude_track_dBpersec;
  return;
}

static void vorbis_encode_global_stereo(vorbis_info *vi,
                                        const highlevel_encode_setup *const hi,
                                        const adj_stereo *p){
  float s=hi->stereo_point_setting;
  int i,is=s;
  double ds=s-is;
  codec_setup_info *ci=vi->codec_setup;
  vorbis_info_psy_global *g=&ci->psy_g_param;

  if(p){
    memcpy(g->coupling_prepointamp,p[is].pre,sizeof(*p[is].pre)*PACKETBLOBS);
    memcpy(g->coupling_postpointamp,p[is].post,sizeof(*p[is].post)*PACKETBLOBS);

    if(hi->managed){
      /* interpolate the kHz threshholds */
      for(i=0;i<PACKETBLOBS;i++){
        float kHz=p[is].kHz[i]*(1.-ds)+p[is+1].kHz[i]*ds;
        g->coupling_pointlimit[0][i]=kHz*1000./vi->rate*ci->blocksizes[0];
        g->coupling_pointlimit[1][i]=kHz*1000./vi->rate*ci->blocksizes[1];
        g->coupling_pkHz[i]=kHz;

        kHz=p[is].lowpasskHz[i]*(1.-ds)+p[is+1].lowpasskHz[i]*ds;
        g->sliding_lowpass[0][i]=kHz*1000./vi->rate*ci->blocksizes[0];
        g->sliding_lowpass[1][i]=kHz*1000./vi->rate*ci->blocksizes[1];

      }
    }else{
      float kHz=p[is].kHz[PACKETBLOBS/2]*(1.-ds)+p[is+1].kHz[PACKETBLOBS/2]*ds;
      for(i=0;i<PACKETBLOBS;i++){
        g->coupling_pointlimit[0][i]=kHz*1000./vi->rate*ci->blocksizes[0];
        g->coupling_pointlimit[1][i]=kHz*1000./vi->rate*ci->blocksizes[1];
        g->coupling_pkHz[i]=kHz;
      }

      kHz=p[is].lowpasskHz[PACKETBLOBS/2]*(1.-ds)+p[is+1].lowpasskHz[PACKETBLOBS/2]*ds;
      for(i=0;i<PACKETBLOBS;i++){
        g->sliding_lowpass[0][i]=kHz*1000./vi->rate*ci->blocksizes[0];
        g->sliding_lowpass[1][i]=kHz*1000./vi->rate*ci->blocksizes[1];
      }
    }
  }else{
    for(i=0;i<PACKETBLOBS;i++){
      g->sliding_lowpass[0][i]=ci->blocksizes[0];
      g->sliding_lowpass[1][i]=ci->blocksizes[1];
    }
  }
  return;
}

static void vorbis_encode_psyset_setup(vorbis_info *vi,double s,
                                       const int *nn_start,
                                       const int *nn_partition,
                                       const double *nn_thresh,
                                       int block){
  codec_setup_info *ci=vi->codec_setup;
  vorbis_info_psy *p=ci->psy_param[block];
  highlevel_encode_setup *hi=&ci->hi;
  int is=s;

  if(block>=ci->psys)
    ci->psys=block+1;
  if(!p){
    p=_ogg_calloc(1,sizeof(*p));
    ci->psy_param[block]=p;
  }

  memcpy(p,&_psy_info_template,sizeof(*p));
  p->blockflag=block>>1;

  if(hi->noise_normalize_p){
    p->normal_p=1;
    p->normal_start=nn_start[is];
    p->normal_partition=nn_partition[is];
    p->normal_thresh=nn_thresh[is];
  }

  return;
}

static void vorbis_encode_tonemask_setup(vorbis_info *vi,double s,int block,
                                         const att3 *att,
                                         const int  *max,
                                         const vp_adjblock *in){
  int i,is=s;
  double ds=s-is;
  codec_setup_info *ci=vi->codec_setup;
  vorbis_info_psy *p=ci->psy_param[block];

  /* 0 and 2 are only used by bitmanagement, but there's no harm to always
     filling the values in here */
  p->tone_masteratt[0]=att[is].att[0]*(1.-ds)+att[is+1].att[0]*ds;
  p->tone_masteratt[1]=att[is].att[1]*(1.-ds)+att[is+1].att[1]*ds;
  p->tone_masteratt[2]=att[is].att[2]*(1.-ds)+att[is+1].att[2]*ds;
  p->tone_centerboost=att[is].boost*(1.-ds)+att[is+1].boost*ds;
  p->tone_decay=att[is].decay*(1.-ds)+att[is+1].decay*ds;

  p->max_curve_dB=max[is]*(1.-ds)+max[is+1]*ds;

  for(i=0;i<P_BANDS;i++)
    p->toneatt[i]=in[is].block[i]*(1.-ds)+in[is+1].block[i]*ds;
  return;
}


static void vorbis_encode_compand_setup(vorbis_info *vi,double s,int block,
                                        const compandblock *in,
                                        const double *x){
  int i,is=s;
  double ds=s-is;
  codec_setup_info *ci=vi->codec_setup;
  vorbis_info_psy *p=ci->psy_param[block];

  ds=x[is]*(1.-ds)+x[is+1]*ds;
  is=(int)ds;
  ds-=is;
  if(ds==0 && is>0){
    is--;
    ds=1.;
  }

  /* interpolate the compander settings */
  for(i=0;i<NOISE_COMPAND_LEVELS;i++)
    p->noisecompand[i]=in[is].data[i]*(1.-ds)+in[is+1].data[i]*ds;
  return;
}

static void vorbis_encode_peak_setup(vorbis_info *vi,double s,int block,
                                    const int *suppress){
  int is=s;
  double ds=s-is;
  codec_setup_info *ci=vi->codec_setup;
  vorbis_info_psy *p=ci->psy_param[block];

  p->tone_abs_limit=suppress[is]*(1.-ds)+suppress[is+1]*ds;

  return;
}

static void vorbis_encode_noisebias_setup(vorbis_info *vi,double s,int block,
                                         const int *suppress,
                                         const noise3 *in,
                                         const noiseguard *guard,
                                         double userbias){
  int i,is=s,j;
  double ds=s-is;
  codec_setup_info *ci=vi->codec_setup;
  vorbis_info_psy *p=ci->psy_param[block];

  p->noisemaxsupp=suppress[is]*(1.-ds)+suppress[is+1]*ds;
  p->noisewindowlomin=guard[block].lo;
  p->noisewindowhimin=guard[block].hi;
  p->noisewindowfixed=guard[block].fixed;

  for(j=0;j<P_NOISECURVES;j++)
    for(i=0;i<P_BANDS;i++)
      p->noiseoff[j][i]=in[is].data[j][i]*(1.-ds)+in[is+1].data[j][i]*ds;

  /* impulse blocks may take a user specified bias to boost the
     nominal/high noise encoding depth */
  for(j=0;j<P_NOISECURVES;j++){
    float min=p->noiseoff[j][0]+6; /* the lowest it can go */
    for(i=0;i<P_BANDS;i++){
      p->noiseoff[j][i]+=userbias;
      if(p->noiseoff[j][i]<min)p->noiseoff[j][i]=min;
    }
  }

  return;
}

static void vorbis_encode_ath_setup(vorbis_info *vi,int block){
  codec_setup_info *ci=vi->codec_setup;
  vorbis_info_psy *p=ci->psy_param[block];

  p->ath_adjatt=ci->hi.ath_floating_dB;
  p->ath_maxatt=ci->hi.ath_absolute_dB;
  return;
}


static int book_dup_or_new(codec_setup_info *ci,const static_codebook *book){
  int i;
  for(i=0;i<ci->books;i++)
    if(ci->book_param[i]==book)return(i);

  return(ci->books++);
}

static void vorbis_encode_blocksize_setup(vorbis_info *vi,double s,
                                         const int *shortb,const int *longb){

  codec_setup_info *ci=vi->codec_setup;
  int is=s;

  int blockshort=shortb[is];
  int blocklong=longb[is];
  ci->blocksizes[0]=blockshort;
  ci->blocksizes[1]=blocklong;

}

static void vorbis_encode_residue_setup(vorbis_info *vi,
                                        int number, int block,
                                        const vorbis_residue_template *res){

  codec_setup_info *ci=vi->codec_setup;
  int i;

  vorbis_info_residue0 *r=ci->residue_param[number]=
    _ogg_malloc(sizeof(*r));

  memcpy(r,res->res,sizeof(*r));
  if(ci->residues<=number)ci->residues=number+1;

  r->grouping=res->grouping;
  ci->residue_type[number]=res->res_type;

  /* fill in all the books */
  {
    int booklist=0,k;

    if(ci->hi.managed){
      for(i=0;i<r->partitions;i++)
        for(k=0;k<4;k++)
          if(res->books_base_managed->books[i][k])
            r->secondstages[i]|=(1<<k);

      r->groupbook=book_dup_or_new(ci,res->book_aux_managed);
      ci->book_param[r->groupbook]=(static_codebook *)res->book_aux_managed;

      for(i=0;i<r->partitions;i++){
        for(k=0;k<4;k++){
          if(res->books_base_managed->books[i][k]){
            int bookid=book_dup_or_new(ci,res->books_base_managed->books[i][k]);
            r->booklist[booklist++]=bookid;
            ci->book_param[bookid]=(static_codebook *)res->books_base_managed->books[i][k];
          }
        }
      }

    }else{

      for(i=0;i<r->partitions;i++)
        for(k=0;k<4;k++)
          if(res->books_base->books[i][k])
            r->secondstages[i]|=(1<<k);

      r->groupbook=book_dup_or_new(ci,res->book_aux);
      ci->book_param[r->groupbook]=(static_codebook *)res->book_aux;

      for(i=0;i<r->partitions;i++){
        for(k=0;k<4;k++){
          if(res->books_base->books[i][k]){
            int bookid=book_dup_or_new(ci,res->books_base->books[i][k]);
            r->booklist[booklist++]=bookid;
            ci->book_param[bookid]=(static_codebook *)res->books_base->books[i][k];
          }
        }
      }
    }
  }

  /* lowpass setup/pointlimit */
  {
    double freq=ci->hi.lowpass_kHz*1000.;
    vorbis_info_floor1 *f=ci->floor_param[block]; /* by convention */
    double nyq=vi->rate/2.;
    long blocksize=ci->blocksizes[block]>>1;

    /* lowpass needs to be set in the floor and the residue. */
    if(freq>nyq)freq=nyq;
    /* in the floor, the granularity can be very fine; it doesn't alter
       the encoding structure, only the samples used to fit the floor
       approximation */
    f->n=freq/nyq*blocksize;

    /* this res may by limited by the maximum pointlimit of the mode,
       not the lowpass. the floor is always lowpass limited. */
    switch(res->limit_type){
    case 1: /* point stereo limited */
      if(ci->hi.managed)
        freq=ci->psy_g_param.coupling_pkHz[PACKETBLOBS-1]*1000.;
      else
        freq=ci->psy_g_param.coupling_pkHz[PACKETBLOBS/2]*1000.;
      if(freq>nyq)freq=nyq;
      break;
    case 2: /* LFE channel; lowpass at ~ 250Hz */
      freq=250;
      break;
    default:
      /* already set */
      break;
    }

    /* in the residue, we're constrained, physically, by partition
       boundaries.  We still lowpass 'wherever', but we have to round up
       here to next boundary, or the vorbis spec will round it *down* to
       previous boundary in encode/decode */
    if(ci->residue_type[number]==2){
      /* residue 2 bundles together multiple channels; used by stereo
         and surround.  Count the channels in use */
      /* Multiple maps/submaps can point to the same residue.  In the case
         of residue 2, they all better have the same number of
         channels/samples. */
      int j,k,ch=0;
      for(i=0;i<ci->maps&&ch==0;i++){
        vorbis_info_mapping0 *mi=(vorbis_info_mapping0 *)ci->map_param[i];
        for(j=0;j<mi->submaps && ch==0;j++)
          if(mi->residuesubmap[j]==number) /* we found a submap referencing theis residue backend */
            for(k=0;k<vi->channels;k++)
              if(mi->chmuxlist[k]==j) /* this channel belongs to the submap */
                ch++;
      }

      r->end=(int)((freq/nyq*blocksize*ch)/r->grouping+.9)* /* round up only if we're well past */
        r->grouping;
      /* the blocksize and grouping may disagree at the end */
      if(r->end>blocksize*ch)r->end=blocksize*ch/r->grouping*r->grouping;

    }else{

      r->end=(int)((freq/nyq*blocksize)/r->grouping+.9)* /* round up only if we're well past */
        r->grouping;
      /* the blocksize and grouping may disagree at the end */
      if(r->end>blocksize)r->end=blocksize/r->grouping*r->grouping;

    }

    if(r->end==0)r->end=r->grouping; /* LFE channel */

  }
}

/* we assume two maps in this encoder */
static void vorbis_encode_map_n_res_setup(vorbis_info *vi,double s,
                                          const vorbis_mapping_template *maps){

  codec_setup_info *ci=vi->codec_setup;
  int i,j,is=s,modes=2;
  const vorbis_info_mapping0 *map=maps[is].map;
  const vorbis_info_mode *mode=_mode_template;
  const vorbis_residue_template *res=maps[is].res;

  if(ci->blocksizes[0]==ci->blocksizes[1])modes=1;

  for(i=0;i<modes;i++){

    ci->map_param[i]=_ogg_calloc(1,sizeof(*map));
    ci->mode_param[i]=_ogg_calloc(1,sizeof(*mode));

    memcpy(ci->mode_param[i],mode+i,sizeof(*_mode_template));
    if(i>=ci->modes)ci->modes=i+1;

    ci->map_type[i]=0;
    memcpy(ci->map_param[i],map+i,sizeof(*map));
    if(i>=ci->maps)ci->maps=i+1;

    for(j=0;j<map[i].submaps;j++)
      vorbis_encode_residue_setup(vi,map[i].residuesubmap[j],i
                                  ,res+map[i].residuesubmap[j]);
  }
}

static double setting_to_approx_bitrate(vorbis_info *vi){
  codec_setup_info *ci=vi->codec_setup;
  highlevel_encode_setup *hi=&ci->hi;
  ve_setup_data_template *setup=(ve_setup_data_template *)hi->setup;
  int is=hi->base_setting;
  double ds=hi->base_setting-is;
  int ch=vi->channels;
  const double *r=setup->rate_mapping;

  if(r==NULL)
    return(-1);

  return((r[is]*(1.-ds)+r[is+1]*ds)*ch);
}

static const void *get_setup_template(long ch,long srate,
                                      double req,int q_or_bitrate,
                                      double *base_setting){
  int i=0,j;
  if(q_or_bitrate)req/=ch;

  while(setup_list[i]){
    if(setup_list[i]->coupling_restriction==-1 ||
       setup_list[i]->coupling_restriction==ch){
      if(srate>=setup_list[i]->samplerate_min_restriction &&
         srate<=setup_list[i]->samplerate_max_restriction){
        int mappings=setup_list[i]->mappings;
        const double *map=(q_or_bitrate?
                     setup_list[i]->rate_mapping:
                     setup_list[i]->quality_mapping);

        /* the template matches.  Does the requested quality mode
           fall within this template's modes? */
        if(req<map[0]){++i;continue;}
        if(req>map[setup_list[i]->mappings]){++i;continue;}
        for(j=0;j<mappings;j++)
          if(req>=map[j] && req<map[j+1])break;
        /* an all-points match */
        if(j==mappings)
          *base_setting=j-.001;
        else{
          float low=map[j];
          float high=map[j+1];
          float del=(req-low)/(high-low);
          *base_setting=j+del;
        }

        return(setup_list[i]);
      }
    }
    i++;
  }

  return NULL;
}

/* encoders will need to use vorbis_info_init beforehand and call
   vorbis_info clear when all done */

/* two interfaces; this, more detailed one, and later a convenience
   layer on top */

/* the final setup call */
int vorbis_encode_setup_init(vorbis_info *vi){
  int i,i0=0,singleblock=0;
  codec_setup_info *ci=vi->codec_setup;
  ve_setup_data_template *setup=NULL;
  highlevel_encode_setup *hi=&ci->hi;

  if(ci==NULL)return(OV_EINVAL);
  if(vi->channels<1||vi->channels>255)return(OV_EINVAL);
  if(!hi->impulse_block_p)i0=1;

  /* too low/high an ATH floater is nonsensical, but doesn't break anything */
  if(hi->ath_floating_dB>-80)hi->ath_floating_dB=-80;
  if(hi->ath_floating_dB<-200)hi->ath_floating_dB=-200;

  /* again, bound this to avoid the app shooting itself int he foot
     too badly */
  if(hi->amplitude_track_dBpersec>0.)hi->amplitude_track_dBpersec=0.;
  if(hi->amplitude_track_dBpersec<-99999.)hi->amplitude_track_dBpersec=-99999.;

  /* get the appropriate setup template; matches the fetch in previous
     stages */
  setup=(ve_setup_data_template *)hi->setup;
  if(setup==NULL)return(OV_EINVAL);

  hi->set_in_stone=1;
  /* choose block sizes from configured sizes as well as paying
     attention to long_block_p and short_block_p.  If the configured
     short and long blocks are the same length, we set long_block_p
     and unset short_block_p */
  vorbis_encode_blocksize_setup(vi,hi->base_setting,
                                setup->blocksize_short,
                                setup->blocksize_long);
  if(ci->blocksizes[0]==ci->blocksizes[1])singleblock=1;

  /* floor setup; choose proper floor params.  Allocated on the floor
     stack in order; if we alloc only a single long floor, it's 0 */
  for(i=0;i<setup->floor_mappings;i++)
    vorbis_encode_floor_setup(vi,hi->base_setting,
                              setup->floor_books,
                              setup->floor_params,
                              setup->floor_mapping_list[i]);

  /* setup of [mostly] short block detection and stereo*/
  vorbis_encode_global_psych_setup(vi,hi->trigger_setting,
                                   setup->global_params,
                                   setup->global_mapping);
  vorbis_encode_global_stereo(vi,hi,setup->stereo_modes);

  /* basic psych setup and noise normalization */
  vorbis_encode_psyset_setup(vi,hi->base_setting,
                             setup->psy_noise_normal_start[0],
                             setup->psy_noise_normal_partition[0],
                             setup->psy_noise_normal_thresh,
                             0);
  vorbis_encode_psyset_setup(vi,hi->base_setting,
                             setup->psy_noise_normal_start[0],
                             setup->psy_noise_normal_partition[0],
                             setup->psy_noise_normal_thresh,
                             1);
  if(!singleblock){
    vorbis_encode_psyset_setup(vi,hi->base_setting,
                               setup->psy_noise_normal_start[1],
                               setup->psy_noise_normal_partition[1],
                                    setup->psy_noise_normal_thresh,
                               2);
    vorbis_encode_psyset_setup(vi,hi->base_setting,
                               setup->psy_noise_normal_start[1],
                               setup->psy_noise_normal_partition[1],
                               setup->psy_noise_normal_thresh,
                               3);
  }

  /* tone masking setup */
  vorbis_encode_tonemask_setup(vi,hi->block[i0].tone_mask_setting,0,
                               setup->psy_tone_masteratt,
                               setup->psy_tone_0dB,
                               setup->psy_tone_adj_impulse);
  vorbis_encode_tonemask_setup(vi,hi->block[1].tone_mask_setting,1,
                               setup->psy_tone_masteratt,
                               setup->psy_tone_0dB,
                               setup->psy_tone_adj_other);
  if(!singleblock){
    vorbis_encode_tonemask_setup(vi,hi->block[2].tone_mask_setting,2,
                                 setup->psy_tone_masteratt,
                                 setup->psy_tone_0dB,
                                 setup->psy_tone_adj_other);
    vorbis_encode_tonemask_setup(vi,hi->block[3].tone_mask_setting,3,
                                 setup->psy_tone_masteratt,
                                 setup->psy_tone_0dB,
                                 setup->psy_tone_adj_long);
  }

  /* noise companding setup */
  vorbis_encode_compand_setup(vi,hi->block[i0].noise_compand_setting,0,
                              setup->psy_noise_compand,
                              setup->psy_noise_compand_short_mapping);
  vorbis_encode_compand_setup(vi,hi->block[1].noise_compand_setting,1,
                              setup->psy_noise_compand,
                              setup->psy_noise_compand_short_mapping);
  if(!singleblock){
    vorbis_encode_compand_setup(vi,hi->block[2].noise_compand_setting,2,
                                setup->psy_noise_compand,
                                setup->psy_noise_compand_long_mapping);
    vorbis_encode_compand_setup(vi,hi->block[3].noise_compand_setting,3,
                                setup->psy_noise_compand,
                                setup->psy_noise_compand_long_mapping);
  }

  /* peak guarding setup  */
  vorbis_encode_peak_setup(vi,hi->block[i0].tone_peaklimit_setting,0,
                           setup->psy_tone_dBsuppress);
  vorbis_encode_peak_setup(vi,hi->block[1].tone_peaklimit_setting,1,
                           setup->psy_tone_dBsuppress);
  if(!singleblock){
    vorbis_encode_peak_setup(vi,hi->block[2].tone_peaklimit_setting,2,
                             setup->psy_tone_dBsuppress);
    vorbis_encode_peak_setup(vi,hi->block[3].tone_peaklimit_setting,3,
                             setup->psy_tone_dBsuppress);
  }

  /* noise bias setup */
  vorbis_encode_noisebias_setup(vi,hi->block[i0].noise_bias_setting,0,
                                setup->psy_noise_dBsuppress,
                                setup->psy_noise_bias_impulse,
                                setup->psy_noiseguards,
                                (i0==0?hi->impulse_noisetune:0.));
  vorbis_encode_noisebias_setup(vi,hi->block[1].noise_bias_setting,1,
                                setup->psy_noise_dBsuppress,
                                setup->psy_noise_bias_padding,
                                setup->psy_noiseguards,0.);
  if(!singleblock){
    vorbis_encode_noisebias_setup(vi,hi->block[2].noise_bias_setting,2,
                                  setup->psy_noise_dBsuppress,
                                  setup->psy_noise_bias_trans,
                                  setup->psy_noiseguards,0.);
    vorbis_encode_noisebias_setup(vi,hi->block[3].noise_bias_setting,3,
                                  setup->psy_noise_dBsuppress,
                                  setup->psy_noise_bias_long,
                                  setup->psy_noiseguards,0.);
  }

  vorbis_encode_ath_setup(vi,0);
  vorbis_encode_ath_setup(vi,1);
  if(!singleblock){
    vorbis_encode_ath_setup(vi,2);
    vorbis_encode_ath_setup(vi,3);
  }

  vorbis_encode_map_n_res_setup(vi,hi->base_setting,setup->maps);

  /* set bitrate readonlies and management */
  if(hi->bitrate_av>0)
    vi->bitrate_nominal=hi->bitrate_av;
  else{
    vi->bitrate_nominal=setting_to_approx_bitrate(vi);
  }

  vi->bitrate_lower=hi->bitrate_min;
  vi->bitrate_upper=hi->bitrate_max;
  if(hi->bitrate_av)
    vi->bitrate_window=(double)hi->bitrate_reservoir/hi->bitrate_av;
  else
    vi->bitrate_window=0.;

  if(hi->managed){
    ci->bi.avg_rate=hi->bitrate_av;
    ci->bi.min_rate=hi->bitrate_min;
    ci->bi.max_rate=hi->bitrate_max;

    ci->bi.reservoir_bits=hi->bitrate_reservoir;
    ci->bi.reservoir_bias=
      hi->bitrate_reservoir_bias;

    ci->bi.slew_damp=hi->bitrate_av_damp;

  }

  return(0);

}

static void vorbis_encode_setup_setting(vorbis_info *vi,
                                       long  channels,
                                       long  rate){
  int i,is;
  codec_setup_info *ci=vi->codec_setup;
  highlevel_encode_setup *hi=&ci->hi;
  const ve_setup_data_template *setup=hi->setup;
  double ds;

  vi->version=0;
  vi->channels=channels;
  vi->rate=rate;

  hi->impulse_block_p=1;
  hi->noise_normalize_p=1;

  is=hi->base_setting;
  ds=hi->base_setting-is;

  hi->stereo_point_setting=hi->base_setting;

  if(!hi->lowpass_altered)
    hi->lowpass_kHz=
      setup->psy_lowpass[is]*(1.-ds)+setup->psy_lowpass[is+1]*ds;

  hi->ath_floating_dB=setup->psy_ath_float[is]*(1.-ds)+
    setup->psy_ath_float[is+1]*ds;
  hi->ath_absolute_dB=setup->psy_ath_abs[is]*(1.-ds)+
    setup->psy_ath_abs[is+1]*ds;

  hi->amplitude_track_dBpersec=-6.;
  hi->trigger_setting=hi->base_setting;

  for(i=0;i<4;i++){
    hi->block[i].tone_mask_setting=hi->base_setting;
    hi->block[i].tone_peaklimit_setting=hi->base_setting;
    hi->block[i].noise_bias_setting=hi->base_setting;
    hi->block[i].noise_compand_setting=hi->base_setting;
  }
}

int vorbis_encode_setup_vbr(vorbis_info *vi,
                            long  channels,
                            long  rate,
                            float quality){
  codec_setup_info *ci;
  highlevel_encode_setup *hi;
  if(rate<=0) return OV_EINVAL;

  ci=vi->codec_setup;
  hi=&ci->hi;

  quality+=.0000001;
  if(quality>=1.)quality=.9999;

  hi->req=quality;
  hi->setup=get_setup_template(channels,rate,quality,0,&hi->base_setting);
  if(!hi->setup)return OV_EIMPL;

  vorbis_encode_setup_setting(vi,channels,rate);
  hi->managed=0;
  hi->coupling_p=1;

  return 0;
}

int vorbis_encode_init_vbr(vorbis_info *vi,
                           long channels,
                           long rate,

                           float base_quality /* 0. to 1. */
                           ){
  int ret=0;

  ret=vorbis_encode_setup_vbr(vi,channels,rate,base_quality);

  if(ret){
    vorbis_info_clear(vi);
    return ret;
  }
  ret=vorbis_encode_setup_init(vi);
  if(ret)
    vorbis_info_clear(vi);
  return(ret);
}

int vorbis_encode_setup_managed(vorbis_info *vi,
                                long channels,
                                long rate,

                                long max_bitrate,
                                long nominal_bitrate,
                                long min_bitrate){

  codec_setup_info *ci;
  highlevel_encode_setup *hi;
  double tnominal;
  if(rate<=0) return OV_EINVAL;

  ci=vi->codec_setup;
  hi=&ci->hi;
  tnominal=nominal_bitrate;

  if(nominal_bitrate<=0.){
    if(max_bitrate>0.){
      if(min_bitrate>0.)
        nominal_bitrate=(max_bitrate+min_bitrate)*.5;
      else
        nominal_bitrate=max_bitrate*.875;
    }else{
      if(min_bitrate>0.){
        nominal_bitrate=min_bitrate;
      }else{
        return(OV_EINVAL);
      }
    }
  }

  hi->req=nominal_bitrate;
  hi->setup=get_setup_template(channels,rate,nominal_bitrate,1,&hi->base_setting);
  if(!hi->setup)return OV_EIMPL;

  vorbis_encode_setup_setting(vi,channels,rate);

  /* initialize management with sane defaults */
  hi->coupling_p=1;
  hi->managed=1;
  hi->bitrate_min=min_bitrate;
  hi->bitrate_max=max_bitrate;
  hi->bitrate_av=tnominal;
  hi->bitrate_av_damp=1.5f; /* full range in no less than 1.5 second */
  hi->bitrate_reservoir=nominal_bitrate*2;
  hi->bitrate_reservoir_bias=.1; /* bias toward hoarding bits */

  return(0);

}

int vorbis_encode_init(vorbis_info *vi,
                       long channels,
                       long rate,

                       long max_bitrate,
                       long nominal_bitrate,
                       long min_bitrate){

  int ret=vorbis_encode_setup_managed(vi,channels,rate,
                                      max_bitrate,
                                      nominal_bitrate,
                                      min_bitrate);
  if(ret){
    vorbis_info_clear(vi);
    return(ret);
  }

  ret=vorbis_encode_setup_init(vi);
  if(ret)
    vorbis_info_clear(vi);
  return(ret);
}

int vorbis_encode_ctl(vorbis_info *vi,int number,void *arg){
  if(vi){
    codec_setup_info *ci=vi->codec_setup;
    highlevel_encode_setup *hi=&ci->hi;
    int setp=(number&0xf); /* a read request has a low nibble of 0 */

    if(setp && hi->set_in_stone)return(OV_EINVAL);

    switch(number){

    /* now deprecated *****************/
    case OV_ECTL_RATEMANAGE_GET:
      {

        struct ovectl_ratemanage_arg *ai=
          (struct ovectl_ratemanage_arg *)arg;

        ai->management_active=hi->managed;
        ai->bitrate_hard_window=ai->bitrate_av_window=
          (double)hi->bitrate_reservoir/vi->rate;
        ai->bitrate_av_window_center=1.;
        ai->bitrate_hard_min=hi->bitrate_min;
        ai->bitrate_hard_max=hi->bitrate_max;
        ai->bitrate_av_lo=hi->bitrate_av;
        ai->bitrate_av_hi=hi->bitrate_av;

      }
      return(0);

    /* now deprecated *****************/
    case OV_ECTL_RATEMANAGE_SET:
      {
        struct ovectl_ratemanage_arg *ai=
          (struct ovectl_ratemanage_arg *)arg;
        if(ai==NULL){
          hi->managed=0;
        }else{
          hi->managed=ai->management_active;
          vorbis_encode_ctl(vi,OV_ECTL_RATEMANAGE_AVG,arg);
          vorbis_encode_ctl(vi,OV_ECTL_RATEMANAGE_HARD,arg);
        }
      }
      return 0;

    /* now deprecated *****************/
    case OV_ECTL_RATEMANAGE_AVG:
      {
        struct ovectl_ratemanage_arg *ai=
          (struct ovectl_ratemanage_arg *)arg;
        if(ai==NULL){
          hi->bitrate_av=0;
        }else{
          hi->bitrate_av=(ai->bitrate_av_lo+ai->bitrate_av_hi)*.5;
        }
      }
      return(0);
    /* now deprecated *****************/
    case OV_ECTL_RATEMANAGE_HARD:
      {
        struct ovectl_ratemanage_arg *ai=
          (struct ovectl_ratemanage_arg *)arg;
        if(ai==NULL){
          hi->bitrate_min=0;
          hi->bitrate_max=0;
        }else{
          hi->bitrate_min=ai->bitrate_hard_min;
          hi->bitrate_max=ai->bitrate_hard_max;
          hi->bitrate_reservoir=ai->bitrate_hard_window*
            (hi->bitrate_max+hi->bitrate_min)*.5;
        }
        if(hi->bitrate_reservoir<128.)
          hi->bitrate_reservoir=128.;
      }
      return(0);

      /* replacement ratemanage interface */
    case OV_ECTL_RATEMANAGE2_GET:
      {
        struct ovectl_ratemanage2_arg *ai=
          (struct ovectl_ratemanage2_arg *)arg;
        if(ai==NULL)return OV_EINVAL;

        ai->management_active=hi->managed;
        ai->bitrate_limit_min_kbps=hi->bitrate_min/1000;
        ai->bitrate_limit_max_kbps=hi->bitrate_max/1000;
        ai->bitrate_average_kbps=hi->bitrate_av/1000;
        ai->bitrate_average_damping=hi->bitrate_av_damp;
        ai->bitrate_limit_reservoir_bits=hi->bitrate_reservoir;
        ai->bitrate_limit_reservoir_bias=hi->bitrate_reservoir_bias;
      }
      return (0);
    case OV_ECTL_RATEMANAGE2_SET:
      {
        struct ovectl_ratemanage2_arg *ai=
          (struct ovectl_ratemanage2_arg *)arg;
        if(ai==NULL){
          hi->managed=0;
        }else{
          /* sanity check; only catch invariant violations */
          if(ai->bitrate_limit_min_kbps>0 &&
             ai->bitrate_average_kbps>0 &&
             ai->bitrate_limit_min_kbps>ai->bitrate_average_kbps)
            return OV_EINVAL;

          if(ai->bitrate_limit_max_kbps>0 &&
             ai->bitrate_average_kbps>0 &&
             ai->bitrate_limit_max_kbps<ai->bitrate_average_kbps)
            return OV_EINVAL;

          if(ai->bitrate_limit_min_kbps>0 &&
             ai->bitrate_limit_max_kbps>0 &&
             ai->bitrate_limit_min_kbps>ai->bitrate_limit_max_kbps)
            return OV_EINVAL;

          if(ai->bitrate_average_damping <= 0.)
            return OV_EINVAL;

          if(ai->bitrate_limit_reservoir_bits < 0)
            return OV_EINVAL;

          if(ai->bitrate_limit_reservoir_bias < 0.)
            return OV_EINVAL;

          if(ai->bitrate_limit_reservoir_bias > 1.)
            return OV_EINVAL;

          hi->managed=ai->management_active;
          hi->bitrate_min=ai->bitrate_limit_min_kbps * 1000;
          hi->bitrate_max=ai->bitrate_limit_max_kbps * 1000;
          hi->bitrate_av=ai->bitrate_average_kbps * 1000;
          hi->bitrate_av_damp=ai->bitrate_average_damping;
          hi->bitrate_reservoir=ai->bitrate_limit_reservoir_bits;
          hi->bitrate_reservoir_bias=ai->bitrate_limit_reservoir_bias;
        }
      }
      return 0;

    case OV_ECTL_LOWPASS_GET:
      {
        double *farg=(double *)arg;
        *farg=hi->lowpass_kHz;
      }
      return(0);
    case OV_ECTL_LOWPASS_SET:
      {
        double *farg=(double *)arg;
        hi->lowpass_kHz=*farg;

        if(hi->lowpass_kHz<2.)hi->lowpass_kHz=2.;
        if(hi->lowpass_kHz>99.)hi->lowpass_kHz=99.;
        hi->lowpass_altered=1;
      }
      return(0);
    case OV_ECTL_IBLOCK_GET:
      {
        double *farg=(double *)arg;
        *farg=hi->impulse_noisetune;
      }
      return(0);
    case OV_ECTL_IBLOCK_SET:
      {
        double *farg=(double *)arg;
        hi->impulse_noisetune=*farg;

        if(hi->impulse_noisetune>0.)hi->impulse_noisetune=0.;
        if(hi->impulse_noisetune<-15.)hi->impulse_noisetune=-15.;
      }
      return(0);
    case OV_ECTL_COUPLING_GET:
      {
        int *iarg=(int *)arg;
        *iarg=hi->coupling_p;
      }
      return(0);
    case OV_ECTL_COUPLING_SET:
      {
        const void *new_template;
        double new_base=0.;
        int *iarg=(int *)arg;
        hi->coupling_p=((*iarg)!=0);

        /* Fetching a new template can alter the base_setting, which
           many other parameters are based on.  Right now, the only
           parameter drawn from the base_setting that can be altered
           by an encctl is the lowpass, so that is explictly flagged
           to not be overwritten when we fetch a new template and
           recompute the dependant settings */
        new_template = get_setup_template(hi->coupling_p?vi->channels:-1,
                                          vi->rate,
                                          hi->req,
                                          hi->managed,
                                          &new_base);
        if(!new_template)return OV_EIMPL;
        hi->setup=new_template;
        hi->base_setting=new_base;
        vorbis_encode_setup_setting(vi,vi->channels,vi->rate);
      }
      return(0);
    }
    return(OV_EIMPL);
  }
  return(OV_EINVAL);
}