lib/vorbisenc.c

   1 /********************************************************************
   2  *                                                                  *
   3  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
   4  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
   5  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
   6  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
   7  *                                                                  *
   8  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2015             *
   9  * by the Xiph.Org Foundation https://xiph.org/                     *
  10  *                                                                  *
  11  ********************************************************************
  12
  13  function: simple programmatic interface for encoder mode setup
  14
  15  ********************************************************************/
  16
  17 #include <stdlib.h>
  18 #include <string.h>
  19 #include <math.h>
  20
  21 #include "vorbis/codec.h"
  22 #include "vorbis/vorbisenc.h"
  23
  24 #include "codec_internal.h"
  25
  26 #include "os.h"
  27 #include "misc.h"
  28
  29 /* careful with this; it's using static array sizing to make managing
  30    all the modes a little less annoying.  If we use a residue backend
  31    with > 12 partition types, or a different division of iteration,
  32    this needs to be updated. */
  33 typedef struct {
  34   const static_codebook *books[12][4];
  35 } static_bookblock;
  36
  37 typedef struct {
  38   int res_type;
  39   int limit_type; /* 0 lowpass limited, 1 point stereo limited */
  40   int grouping;
  41   const vorbis_info_residue0 *res;
  42   const static_codebook  *book_aux;
  43   const static_codebook  *book_aux_managed;
  44   const static_bookblock *books_base;
  45   const static_bookblock *books_base_managed;
  46 } vorbis_residue_template;
  47
  48 typedef struct {
  49   const vorbis_info_mapping0    *map;
  50   const vorbis_residue_template *res;
  51 } vorbis_mapping_template;
  52
  53 typedef struct vp_adjblock{
  54   int block[P_BANDS];
  55 } vp_adjblock;
  56
  57 typedef struct {
  58   int data[NOISE_COMPAND_LEVELS];
  59 } compandblock;
  60
  61 /* high level configuration information for setting things up
  62    step-by-step with the detailed vorbis_encode_ctl interface.
  63    There's a fair amount of redundancy such that interactive setup
  64    does not directly deal with any vorbis_info or codec_setup_info
  65    initialization; it's all stored (until full init) in this highlevel
  66    setup, then flushed out to the real codec setup structs later. */
  67
  68 typedef struct {
  69   int att[P_NOISECURVES];
  70   float boost;
  71   float decay;
  72 } att3;
  73 typedef struct { int data[P_NOISECURVES]; } adj3;
  74
  75 typedef struct {
  76   int   pre[PACKETBLOBS];
  77   int   post[PACKETBLOBS];
  78   float kHz[PACKETBLOBS];
  79   float lowpasskHz[PACKETBLOBS];
  80 } adj_stereo;
  81
  82 typedef struct {
  83   int lo;
  84   int hi;
  85   int fixed;
  86 } noiseguard;
  87 typedef struct {
  88   int data[P_NOISECURVES][17];
  89 } noise3;
  90
  91 typedef struct {
  92   int      mappings;
  93   const double  *rate_mapping;
  94   const double  *quality_mapping;
  95   int      coupling_restriction;
  96   long     samplerate_min_restriction;
  97   long     samplerate_max_restriction;
  98
  99
 100   const int     *blocksize_short;
 101   const int     *blocksize_long;
 102
 103   const att3    *psy_tone_masteratt;
 104   const int     *psy_tone_0dB;
 105   const int     *psy_tone_dBsuppress;
 106
 107   const vp_adjblock *psy_tone_adj_impulse;
 108   const vp_adjblock *psy_tone_adj_long;
 109   const vp_adjblock *psy_tone_adj_other;
 110
 111   const noiseguard  *psy_noiseguards;
 112   const noise3      *psy_noise_bias_impulse;
 113   const noise3      *psy_noise_bias_padding;
 114   const noise3      *psy_noise_bias_trans;
 115   const noise3      *psy_noise_bias_long;
 116   const int         *psy_noise_dBsuppress;
 117
 118   const compandblock  *psy_noise_compand;
 119   const double        *psy_noise_compand_short_mapping;
 120   const double        *psy_noise_compand_long_mapping;
 121
 122   const int      *psy_noise_normal_start[2];
 123   const int      *psy_noise_normal_partition[2];
 124   const double   *psy_noise_normal_thresh;
 125
 126   const int      *psy_ath_float;
 127   const int      *psy_ath_abs;
 128
 129   const double   *psy_lowpass;
 130
 131   const vorbis_info_psy_global *global_params;
 132   const double     *global_mapping;
 133   const adj_stereo *stereo_modes;
 134
 135   const static_codebook *const *const *const floor_books;
 136   const vorbis_info_floor1 *floor_params;
 137   const int floor_mappings;
 138   const int **floor_mapping_list;
 139
 140   const vorbis_mapping_template *maps;
 141 } ve_setup_data_template;
 142
 143 /* a few static coder conventions */
 144 static const vorbis_info_mode _mode_template[2]={
 145   {0,0,0,0},
 146   {1,0,0,1}
 147 };
 148
 149 static const vorbis_info_mapping0 _map_nominal[2]={
 150   {1, {0,0}, {0}, {0}, 1,{0},{1}},
 151   {1, {0,0}, {1}, {1}, 1,{0},{1}}
 152 };
 153
 154 #include "modes/setup_44.h"
 155 #include "modes/setup_44u.h"
 156 #include "modes/setup_44p51.h"
 157 #include "modes/setup_32.h"
 158 #include "modes/setup_8.h"
 159 #include "modes/setup_11.h"
 160 #include "modes/setup_16.h"
 161 #include "modes/setup_22.h"
 162 #include "modes/setup_X.h"
 163
 164 static const ve_setup_data_template *const setup_list[]={
 165   &ve_setup_44_stereo,
 166   &ve_setup_44_51,
 167   &ve_setup_44_uncoupled,
 168
 169   &ve_setup_32_stereo,
 170   &ve_setup_32_uncoupled,
 171
 172   &ve_setup_22_stereo,
 173   &ve_setup_22_uncoupled,
 174   &ve_setup_16_stereo,
 175   &ve_setup_16_uncoupled,
 176
 177   &ve_setup_11_stereo,
 178   &ve_setup_11_uncoupled,
 179   &ve_setup_8_stereo,
 180   &ve_setup_8_uncoupled,
 181
 182   &ve_setup_X_stereo,
 183   &ve_setup_X_uncoupled,
 184   &ve_setup_XX_stereo,
 185   &ve_setup_XX_uncoupled,
 186   0
 187 };
 188
 189 static void vorbis_encode_floor_setup(vorbis_info *vi,int s,
 190                                      const static_codebook *const *const *const books,
 191                                      const vorbis_info_floor1 *in,
 192                                      const int *x){
 193   int i,k,is=s;
 194   vorbis_info_floor1 *f=_ogg_calloc(1,sizeof(*f));
 195   codec_setup_info *ci=vi->codec_setup;
 196
 197   memcpy(f,in+x[is],sizeof(*f));
 198
 199   /* books */
 200   {
 201     int partitions=f->partitions;
 202     int maxclass=-1;
 203     int maxbook=-1;
 204     for(i=0;i<partitions;i++)
 205       if(f->partitionclass[i]>maxclass)maxclass=f->partitionclass[i];
 206     for(i=0;i<=maxclass;i++){
 207       if(f->class_book[i]>maxbook)maxbook=f->class_book[i];
 208       f->class_book[i]+=ci->books;
 209       for(k=0;k<(1<<f->class_subs[i]);k++){
 210         if(f->class_subbook[i][k]>maxbook)maxbook=f->class_subbook[i][k];
 211         if(f->class_subbook[i][k]>=0)f->class_subbook[i][k]+=ci->books;
 212       }
 213     }
 214
 215     for(i=0;i<=maxbook;i++)
 216       ci->book_param[ci->books++]=(static_codebook *)books[x[is]][i];
 217   }
 218
 219   /* for now, we're only using floor 1 */
 220   ci->floor_type[ci->floors]=1;
 221   ci->floor_param[ci->floors]=f;
 222   ci->floors++;
 223
 224   return;
 225 }
 226
 227 static void vorbis_encode_global_psych_setup(vorbis_info *vi,double s,
 228                                             const vorbis_info_psy_global *in,
 229                                             const double *x){
 230   int i,is=s;
 231   double ds=s-is;
 232   codec_setup_info *ci=vi->codec_setup;
 233   vorbis_info_psy_global *g=&ci->psy_g_param;
 234
 235   memcpy(g,in+(int)x[is],sizeof(*g));
 236
 237   ds=x[is]*(1.-ds)+x[is+1]*ds;
 238   is=(int)ds;
 239   ds-=is;
 240   if(ds==0 && is>0){
 241     is--;
 242     ds=1.;
 243   }
 244
 245   /* interpolate the trigger threshholds */
 246   for(i=0;i<4;i++){
 247     g->preecho_thresh[i]=in[is].preecho_thresh[i]*(1.-ds)+in[is+1].preecho_thresh[i]*ds;
 248     g->postecho_thresh[i]=in[is].postecho_thresh[i]*(1.-ds)+in[is+1].postecho_thresh[i]*ds;
 249   }
 250   g->ampmax_att_per_sec=ci->hi.amplitude_track_dBpersec;
 251   return;
 252 }
 253
 254 static void vorbis_encode_global_stereo(vorbis_info *vi,
 255                                         const highlevel_encode_setup *const hi,
 256                                         const adj_stereo *p){
 257   float s=hi->stereo_point_setting;
 258   int i,is=s;
 259   double ds=s-is;
 260   codec_setup_info *ci=vi->codec_setup;
 261   vorbis_info_psy_global *g=&ci->psy_g_param;
 262
 263   if(p){
 264     memcpy(g->coupling_prepointamp,p[is].pre,sizeof(*p[is].pre)*PACKETBLOBS);
 265     memcpy(g->coupling_postpointamp,p[is].post,sizeof(*p[is].post)*PACKETBLOBS);
 266
 267     if(hi->managed){
 268       /* interpolate the kHz threshholds */
 269       for(i=0;i<PACKETBLOBS;i++){
 270         float kHz=p[is].kHz[i]*(1.-ds)+p[is+1].kHz[i]*ds;
 271         g->coupling_pointlimit[0][i]=kHz*1000./vi->rate*ci->blocksizes[0];
 272         g->coupling_pointlimit[1][i]=kHz*1000./vi->rate*ci->blocksizes[1];
 273         g->coupling_pkHz[i]=kHz;
 274
 275         kHz=p[is].lowpasskHz[i]*(1.-ds)+p[is+1].lowpasskHz[i]*ds;
 276         g->sliding_lowpass[0][i]=kHz*1000./vi->rate*ci->blocksizes[0];
 277         g->sliding_lowpass[1][i]=kHz*1000./vi->rate*ci->blocksizes[1];
 278
 279       }
 280     }else{
 281       float kHz=p[is].kHz[PACKETBLOBS/2]*(1.-ds)+p[is+1].kHz[PACKETBLOBS/2]*ds;
 282       for(i=0;i<PACKETBLOBS;i++){
 283         g->coupling_pointlimit[0][i]=kHz*1000./vi->rate*ci->blocksizes[0];
 284         g->coupling_pointlimit[1][i]=kHz*1000./vi->rate*ci->blocksizes[1];
 285         g->coupling_pkHz[i]=kHz;
 286       }
 287
 288       kHz=p[is].lowpasskHz[PACKETBLOBS/2]*(1.-ds)+p[is+1].lowpasskHz[PACKETBLOBS/2]*ds;
 289       for(i=0;i<PACKETBLOBS;i++){
 290         g->sliding_lowpass[0][i]=kHz*1000./vi->rate*ci->blocksizes[0];
 291         g->sliding_lowpass[1][i]=kHz*1000./vi->rate*ci->blocksizes[1];
 292       }
 293     }
 294   }else{
 295     for(i=0;i<PACKETBLOBS;i++){
 296       g->sliding_lowpass[0][i]=ci->blocksizes[0];
 297       g->sliding_lowpass[1][i]=ci->blocksizes[1];
 298     }
 299   }
 300   return;
 301 }
 302
 303 static void vorbis_encode_psyset_setup(vorbis_info *vi,double s,
 304                                        const int *nn_start,
 305                                        const int *nn_partition,
 306                                        const double *nn_thresh,
 307                                        int block){
 308   codec_setup_info *ci=vi->codec_setup;
 309   vorbis_info_psy *p=ci->psy_param[block];
 310   highlevel_encode_setup *hi=&ci->hi;
 311   int is=s;
 312
 313   if(block>=ci->psys)
 314     ci->psys=block+1;
 315   if(!p){
 316     p=_ogg_calloc(1,sizeof(*p));
 317     ci->psy_param[block]=p;
 318   }
 319
 320   memcpy(p,&_psy_info_template,sizeof(*p));
 321   p->blockflag=block>>1;
 322
 323   if(hi->noise_normalize_p){
 324     p->normal_p=1;
 325     p->normal_start=nn_start[is];
 326     p->normal_partition=nn_partition[is];
 327     p->normal_thresh=nn_thresh[is];
 328   }
 329
 330   return;
 331 }
 332
 333 static void vorbis_encode_tonemask_setup(vorbis_info *vi,double s,int block,
 334                                          const att3 *att,
 335                                          const int  *max,
 336                                          const vp_adjblock *in){
 337   int i,is=s;
 338   double ds=s-is;
 339   codec_setup_info *ci=vi->codec_setup;
 340   vorbis_info_psy *p=ci->psy_param[block];
 341
 342   /* 0 and 2 are only used by bitmanagement, but there's no harm to always
 343      filling the values in here */
 344   p->tone_masteratt[0]=att[is].att[0]*(1.-ds)+att[is+1].att[0]*ds;
 345   p->tone_masteratt[1]=att[is].att[1]*(1.-ds)+att[is+1].att[1]*ds;
 346   p->tone_masteratt[2]=att[is].att[2]*(1.-ds)+att[is+1].att[2]*ds;
 347   p->tone_centerboost=att[is].boost*(1.-ds)+att[is+1].boost*ds;
 348   p->tone_decay=att[is].decay*(1.-ds)+att[is+1].decay*ds;
 349
 350   p->max_curve_dB=max[is]*(1.-ds)+max[is+1]*ds;
 351
 352   for(i=0;i<P_BANDS;i++)
 353     p->toneatt[i]=in[is].block[i]*(1.-ds)+in[is+1].block[i]*ds;
 354   return;
 355 }
 356
 357
 358 static void vorbis_encode_compand_setup(vorbis_info *vi,double s,int block,
 359                                         const compandblock *in,
 360                                         const double *x){
 361   int i,is=s;
 362   double ds=s-is;
 363   codec_setup_info *ci=vi->codec_setup;
 364   vorbis_info_psy *p=ci->psy_param[block];
 365
 366   ds=x[is]*(1.-ds)+x[is+1]*ds;
 367   is=(int)ds;
 368   ds-=is;
 369   if(ds==0 && is>0){
 370     is--;
 371     ds=1.;
 372   }
 373
 374   /* interpolate the compander settings */
 375   for(i=0;i<NOISE_COMPAND_LEVELS;i++)
 376     p->noisecompand[i]=in[is].data[i]*(1.-ds)+in[is+1].data[i]*ds;
 377   return;
 378 }
 379
 380 static void vorbis_encode_peak_setup(vorbis_info *vi,double s,int block,
 381                                     const int *suppress){
 382   int is=s;
 383   double ds=s-is;
 384   codec_setup_info *ci=vi->codec_setup;
 385   vorbis_info_psy *p=ci->psy_param[block];
 386
 387   p->tone_abs_limit=suppress[is]*(1.-ds)+suppress[is+1]*ds;
 388
 389   return;
 390 }
 391
 392 static void vorbis_encode_noisebias_setup(vorbis_info *vi,double s,int block,
 393                                          const int *suppress,
 394                                          const noise3 *in,
 395                                          const noiseguard *guard,
 396                                          double userbias){
 397   int i,is=s,j;
 398   double ds=s-is;
 399   codec_setup_info *ci=vi->codec_setup;
 400   vorbis_info_psy *p=ci->psy_param[block];
 401
 402   p->noisemaxsupp=suppress[is]*(1.-ds)+suppress[is+1]*ds;
 403   p->noisewindowlomin=guard[block].lo;
 404   p->noisewindowhimin=guard[block].hi;
 405   p->noisewindowfixed=guard[block].fixed;
 406
 407   for(j=0;j<P_NOISECURVES;j++)
 408     for(i=0;i<P_BANDS;i++)
 409       p->noiseoff[j][i]=in[is].data[j][i]*(1.-ds)+in[is+1].data[j][i]*ds;
 410
 411   /* impulse blocks may take a user specified bias to boost the
 412      nominal/high noise encoding depth */
 413   for(j=0;j<P_NOISECURVES;j++){
 414     float min=p->noiseoff[j][0]+6; /* the lowest it can go */
 415     for(i=0;i<P_BANDS;i++){
 416       p->noiseoff[j][i]+=userbias;
 417       if(p->noiseoff[j][i]<min)p->noiseoff[j][i]=min;
 418     }
 419   }
 420
 421   return;
 422 }
 423
 424 static void vorbis_encode_ath_setup(vorbis_info *vi,int block){
 425   codec_setup_info *ci=vi->codec_setup;
 426   vorbis_info_psy *p=ci->psy_param[block];
 427
 428   p->ath_adjatt=ci->hi.ath_floating_dB;
 429   p->ath_maxatt=ci->hi.ath_absolute_dB;
 430   return;
 431 }
 432
 433
 434 static int book_dup_or_new(codec_setup_info *ci,const static_codebook *book){
 435   int i;
 436   for(i=0;i<ci->books;i++)
 437     if(ci->book_param[i]==book)return(i);
 438
 439   return(ci->books++);
 440 }
 441
 442 static void vorbis_encode_blocksize_setup(vorbis_info *vi,double s,
 443                                          const int *shortb,const int *longb){
 444
 445   codec_setup_info *ci=vi->codec_setup;
 446   int is=s;
 447
 448   int blockshort=shortb[is];
 449   int blocklong=longb[is];
 450   ci->blocksizes[0]=blockshort;
 451   ci->blocksizes[1]=blocklong;
 452
 453 }
 454
 455 static void vorbis_encode_residue_setup(vorbis_info *vi,
 456                                         int number, int block,
 457                                         const vorbis_residue_template *res){
 458
 459   codec_setup_info *ci=vi->codec_setup;
 460   int i;
 461
 462   vorbis_info_residue0 *r=ci->residue_param[number]=
 463     _ogg_malloc(sizeof(*r));
 464
 465   memcpy(r,res->res,sizeof(*r));
 466   if(ci->residues<=number)ci->residues=number+1;
 467
 468   r->grouping=res->grouping;
 469   ci->residue_type[number]=res->res_type;
 470
 471   /* fill in all the books */
 472   {
 473     int booklist=0,k;
 474
 475     if(ci->hi.managed){
 476       for(i=0;i<r->partitions;i++)
 477         for(k=0;k<4;k++)
 478           if(res->books_base_managed->books[i][k])
 479             r->secondstages[i]|=(1<<k);
 480
 481       r->groupbook=book_dup_or_new(ci,res->book_aux_managed);
 482       ci->book_param[r->groupbook]=(static_codebook *)res->book_aux_managed;
 483
 484       for(i=0;i<r->partitions;i++){
 485         for(k=0;k<4;k++){
 486           if(res->books_base_managed->books[i][k]){
 487             int bookid=book_dup_or_new(ci,res->books_base_managed->books[i][k]);
 488             r->booklist[booklist++]=bookid;
 489             ci->book_param[bookid]=(static_codebook *)res->books_base_managed->books[i][k];
 490           }
 491         }
 492       }
 493
 494     }else{
 495
 496       for(i=0;i<r->partitions;i++)
 497         for(k=0;k<4;k++)
 498           if(res->books_base->books[i][k])
 499             r->secondstages[i]|=(1<<k);
 500
 501       r->groupbook=book_dup_or_new(ci,res->book_aux);
 502       ci->book_param[r->groupbook]=(static_codebook *)res->book_aux;
 503
 504       for(i=0;i<r->partitions;i++){
 505         for(k=0;k<4;k++){
 506           if(res->books_base->books[i][k]){
 507             int bookid=book_dup_or_new(ci,res->books_base->books[i][k]);
 508             r->booklist[booklist++]=bookid;
 509             ci->book_param[bookid]=(static_codebook *)res->books_base->books[i][k];
 510           }
 511         }
 512       }
 513     }
 514   }
 515
 516   /* lowpass setup/pointlimit */
 517   {
 518     double freq=ci->hi.lowpass_kHz*1000.;
 519     vorbis_info_floor1 *f=ci->floor_param[block]; /* by convention */
 520     double nyq=vi->rate/2.;
 521     long blocksize=ci->blocksizes[block]>>1;
 522
 523     /* lowpass needs to be set in the floor and the residue. */
 524     if(freq>nyq)freq=nyq;
 525     /* in the floor, the granularity can be very fine; it doesn't alter
 526        the encoding structure, only the samples used to fit the floor
 527        approximation */
 528     f->n=freq/nyq*blocksize;
 529
 530     /* this res may by limited by the maximum pointlimit of the mode,
 531        not the lowpass. the floor is always lowpass limited. */
 532     switch(res->limit_type){
 533     case 1: /* point stereo limited */
 534       if(ci->hi.managed)
 535         freq=ci->psy_g_param.coupling_pkHz[PACKETBLOBS-1]*1000.;
 536       else
 537         freq=ci->psy_g_param.coupling_pkHz[PACKETBLOBS/2]*1000.;
 538       if(freq>nyq)freq=nyq;
 539       break;
 540     case 2: /* LFE channel; lowpass at ~ 250Hz */
 541       freq=250;
 542       break;
 543     default:
 544       /* already set */
 545       break;
 546     }
 547
 548     /* in the residue, we're constrained, physically, by partition
 549        boundaries.  We still lowpass 'wherever', but we have to round up
 550        here to next boundary, or the vorbis spec will round it *down* to
 551        previous boundary in encode/decode */
 552     if(ci->residue_type[number]==2){
 553       /* residue 2 bundles together multiple channels; used by stereo
 554          and surround.  Count the channels in use */
 555       /* Multiple maps/submaps can point to the same residue.  In the case
 556          of residue 2, they all better have the same number of
 557          channels/samples. */
 558       int j,k,ch=0;
 559       for(i=0;i<ci->maps&&ch==0;i++){
 560         vorbis_info_mapping0 *mi=(vorbis_info_mapping0 *)ci->map_param[i];
 561         for(j=0;j<mi->submaps && ch==0;j++)
 562           if(mi->residuesubmap[j]==number) /* we found a submap referencing theis residue backend */
 563             for(k=0;k<vi->channels;k++)
 564               if(mi->chmuxlist[k]==j) /* this channel belongs to the submap */
 565                 ch++;
 566       }
 567
 568       r->end=(int)((freq/nyq*blocksize*ch)/r->grouping+.9)* /* round up only if we're well past */
 569         r->grouping;
 570       /* the blocksize and grouping may disagree at the end */
 571       if(r->end>blocksize*ch)r->end=blocksize*ch/r->grouping*r->grouping;
 572
 573     }else{
 574
 575       r->end=(int)((freq/nyq*blocksize)/r->grouping+.9)* /* round up only if we're well past */
 576         r->grouping;
 577       /* the blocksize and grouping may disagree at the end */
 578       if(r->end>blocksize)r->end=blocksize/r->grouping*r->grouping;
 579
 580     }
 581
 582     if(r->end==0)r->end=r->grouping; /* LFE channel */
 583
 584   }
 585 }
 586
 587 /* we assume two maps in this encoder */
 588 static void vorbis_encode_map_n_res_setup(vorbis_info *vi,double s,
 589                                           const vorbis_mapping_template *maps){
 590
 591   codec_setup_info *ci=vi->codec_setup;
 592   int i,j,is=s,modes=2;
 593   const vorbis_info_mapping0 *map=maps[is].map;
 594   const vorbis_info_mode *mode=_mode_template;
 595   const vorbis_residue_template *res=maps[is].res;
 596
 597   if(ci->blocksizes[0]==ci->blocksizes[1])modes=1;
 598
 599   for(i=0;i<modes;i++){
 600
 601     ci->map_param[i]=_ogg_calloc(1,sizeof(*map));
 602     ci->mode_param[i]=_ogg_calloc(1,sizeof(*mode));
 603
 604     memcpy(ci->mode_param[i],mode+i,sizeof(*_mode_template));
 605     if(i>=ci->modes)ci->modes=i+1;
 606
 607     ci->map_type[i]=0;
 608     memcpy(ci->map_param[i],map+i,sizeof(*map));
 609     if(i>=ci->maps)ci->maps=i+1;
 610
 611     for(j=0;j<map[i].submaps;j++)
 612       vorbis_encode_residue_setup(vi,map[i].residuesubmap[j],i
 613                                   ,res+map[i].residuesubmap[j]);
 614   }
 615 }
 616
 617 static double setting_to_approx_bitrate(vorbis_info *vi){
 618   codec_setup_info *ci=vi->codec_setup;
 619   highlevel_encode_setup *hi=&ci->hi;
 620   ve_setup_data_template *setup=(ve_setup_data_template *)hi->setup;
 621   int is=hi->base_setting;
 622   double ds=hi->base_setting-is;
 623   int ch=vi->channels;
 624   const double *r=setup->rate_mapping;
 625
 626   if(r==NULL)
 627     return(-1);
 628
 629   return((r[is]*(1.-ds)+r[is+1]*ds)*ch);
 630 }
 631
 632 static const void *get_setup_template(long ch,long srate,
 633                                       double req,int q_or_bitrate,
 634                                       double *base_setting){
 635   int i=0,j;
 636   if(q_or_bitrate)req/=ch;
 637
 638   while(setup_list[i]){
 639     if(setup_list[i]->coupling_restriction==-1 ||
 640        setup_list[i]->coupling_restriction==ch){
 641       if(srate>=setup_list[i]->samplerate_min_restriction &&
 642          srate<=setup_list[i]->samplerate_max_restriction){
 643         int mappings=setup_list[i]->mappings;
 644         const double *map=(q_or_bitrate?
 645                      setup_list[i]->rate_mapping:
 646                      setup_list[i]->quality_mapping);
 647
 648         /* the template matches.  Does the requested quality mode
 649            fall within this template's modes? */
 650         if(req<map[0]){++i;continue;}
 651         if(req>map[setup_list[i]->mappings]){++i;continue;}
 652         for(j=0;j<mappings;j++)
 653           if(req>=map[j] && req<map[j+1])break;
 654         /* an all-points match */
 655         if(j==mappings)
 656           *base_setting=j-.001;
 657         else{
 658           float low=map[j];
 659           float high=map[j+1];
 660           float del=(req-low)/(high-low);
 661           *base_setting=j+del;
 662         }
 663
 664         return(setup_list[i]);
 665       }
 666     }
 667     i++;
 668   }
 669
 670   return NULL;
 671 }
 672
 673 /* encoders will need to use vorbis_info_init beforehand and call
 674    vorbis_info clear when all done */
 675
 676 /* two interfaces; this, more detailed one, and later a convenience
 677    layer on top */
 678
 679 /* the final setup call */
 680 int vorbis_encode_setup_init(vorbis_info *vi){
 681   int i,i0=0,singleblock=0;
 682   codec_setup_info *ci=vi->codec_setup;
 683   ve_setup_data_template *setup=NULL;
 684   highlevel_encode_setup *hi=&ci->hi;
 685
 686   if(ci==NULL)return(OV_EINVAL);
 687   if(vi->channels<1||vi->channels>255)return(OV_EINVAL);
 688   if(!hi->impulse_block_p)i0=1;
 689
 690   /* too low/high an ATH floater is nonsensical, but doesn't break anything */
 691   if(hi->ath_floating_dB>-80)hi->ath_floating_dB=-80;
 692   if(hi->ath_floating_dB<-200)hi->ath_floating_dB=-200;
 693
 694   /* again, bound this to avoid the app shooting itself int he foot
 695      too badly */
 696   if(hi->amplitude_track_dBpersec>0.)hi->amplitude_track_dBpersec=0.;
 697   if(hi->amplitude_track_dBpersec<-99999.)hi->amplitude_track_dBpersec=-99999.;
 698
 699   /* get the appropriate setup template; matches the fetch in previous
 700      stages */
 701   setup=(ve_setup_data_template *)hi->setup;
 702   if(setup==NULL)return(OV_EINVAL);
 703
 704   hi->set_in_stone=1;
 705   /* choose block sizes from configured sizes as well as paying
 706      attention to long_block_p and short_block_p.  If the configured
 707      short and long blocks are the same length, we set long_block_p
 708      and unset short_block_p */
 709   vorbis_encode_blocksize_setup(vi,hi->base_setting,
 710                                 setup->blocksize_short,
 711                                 setup->blocksize_long);
 712   if(ci->blocksizes[0]==ci->blocksizes[1])singleblock=1;
 713
 714   /* floor setup; choose proper floor params.  Allocated on the floor
 715      stack in order; if we alloc only a single long floor, it's 0 */
 716   for(i=0;i<setup->floor_mappings;i++)
 717     vorbis_encode_floor_setup(vi,hi->base_setting,
 718                               setup->floor_books,
 719                               setup->floor_params,
 720                               setup->floor_mapping_list[i]);
 721
 722   /* setup of [mostly] short block detection and stereo*/
 723   vorbis_encode_global_psych_setup(vi,hi->trigger_setting,
 724                                    setup->global_params,
 725                                    setup->global_mapping);
 726   vorbis_encode_global_stereo(vi,hi,setup->stereo_modes);
 727
 728   /* basic psych setup and noise normalization */
 729   vorbis_encode_psyset_setup(vi,hi->base_setting,
 730                              setup->psy_noise_normal_start[0],
 731                              setup->psy_noise_normal_partition[0],
 732                              setup->psy_noise_normal_thresh,
 733                              0);
 734   vorbis_encode_psyset_setup(vi,hi->base_setting,
 735                              setup->psy_noise_normal_start[0],
 736                              setup->psy_noise_normal_partition[0],
 737                              setup->psy_noise_normal_thresh,
 738                              1);
 739   if(!singleblock){
 740     vorbis_encode_psyset_setup(vi,hi->base_setting,
 741                                setup->psy_noise_normal_start[1],
 742                                setup->psy_noise_normal_partition[1],
 743                                     setup->psy_noise_normal_thresh,
 744                                2);
 745     vorbis_encode_psyset_setup(vi,hi->base_setting,
 746                                setup->psy_noise_normal_start[1],
 747                                setup->psy_noise_normal_partition[1],
 748                                setup->psy_noise_normal_thresh,
 749                                3);
 750   }
 751
 752   /* tone masking setup */
 753   vorbis_encode_tonemask_setup(vi,hi->block[i0].tone_mask_setting,0,
 754                                setup->psy_tone_masteratt,
 755                                setup->psy_tone_0dB,
 756                                setup->psy_tone_adj_impulse);
 757   vorbis_encode_tonemask_setup(vi,hi->block[1].tone_mask_setting,1,
 758                                setup->psy_tone_masteratt,
 759                                setup->psy_tone_0dB,
 760                                setup->psy_tone_adj_other);
 761   if(!singleblock){
 762     vorbis_encode_tonemask_setup(vi,hi->block[2].tone_mask_setting,2,
 763                                  setup->psy_tone_masteratt,
 764                                  setup->psy_tone_0dB,
 765                                  setup->psy_tone_adj_other);
 766     vorbis_encode_tonemask_setup(vi,hi->block[3].tone_mask_setting,3,
 767                                  setup->psy_tone_masteratt,
 768                                  setup->psy_tone_0dB,
 769                                  setup->psy_tone_adj_long);
 770   }
 771
 772   /* noise companding setup */
 773   vorbis_encode_compand_setup(vi,hi->block[i0].noise_compand_setting,0,
 774                               setup->psy_noise_compand,
 775                               setup->psy_noise_compand_short_mapping);
 776   vorbis_encode_compand_setup(vi,hi->block[1].noise_compand_setting,1,
 777                               setup->psy_noise_compand,
 778                               setup->psy_noise_compand_short_mapping);
 779   if(!singleblock){
 780     vorbis_encode_compand_setup(vi,hi->block[2].noise_compand_setting,2,
 781                                 setup->psy_noise_compand,
 782                                 setup->psy_noise_compand_long_mapping);
 783     vorbis_encode_compand_setup(vi,hi->block[3].noise_compand_setting,3,
 784                                 setup->psy_noise_compand,
 785                                 setup->psy_noise_compand_long_mapping);
 786   }
 787
 788   /* peak guarding setup  */
 789   vorbis_encode_peak_setup(vi,hi->block[i0].tone_peaklimit_setting,0,
 790                            setup->psy_tone_dBsuppress);
 791   vorbis_encode_peak_setup(vi,hi->block[1].tone_peaklimit_setting,1,
 792                            setup->psy_tone_dBsuppress);
 793   if(!singleblock){
 794     vorbis_encode_peak_setup(vi,hi->block[2].tone_peaklimit_setting,2,
 795                              setup->psy_tone_dBsuppress);
 796     vorbis_encode_peak_setup(vi,hi->block[3].tone_peaklimit_setting,3,
 797                              setup->psy_tone_dBsuppress);
 798   }
 799
 800   /* noise bias setup */
 801   vorbis_encode_noisebias_setup(vi,hi->block[i0].noise_bias_setting,0,
 802                                 setup->psy_noise_dBsuppress,
 803                                 setup->psy_noise_bias_impulse,
 804                                 setup->psy_noiseguards,
 805                                 (i0==0?hi->impulse_noisetune:0.));
 806   vorbis_encode_noisebias_setup(vi,hi->block[1].noise_bias_setting,1,
 807                                 setup->psy_noise_dBsuppress,
 808                                 setup->psy_noise_bias_padding,
 809                                 setup->psy_noiseguards,0.);
 810   if(!singleblock){
 811     vorbis_encode_noisebias_setup(vi,hi->block[2].noise_bias_setting,2,
 812                                   setup->psy_noise_dBsuppress,
 813                                   setup->psy_noise_bias_trans,
 814                                   setup->psy_noiseguards,0.);
 815     vorbis_encode_noisebias_setup(vi,hi->block[3].noise_bias_setting,3,
 816                                   setup->psy_noise_dBsuppress,
 817                                   setup->psy_noise_bias_long,
 818                                   setup->psy_noiseguards,0.);
 819   }
 820
 821   vorbis_encode_ath_setup(vi,0);
 822   vorbis_encode_ath_setup(vi,1);
 823   if(!singleblock){
 824     vorbis_encode_ath_setup(vi,2);
 825     vorbis_encode_ath_setup(vi,3);
 826   }
 827
 828   vorbis_encode_map_n_res_setup(vi,hi->base_setting,setup->maps);
 829
 830   /* set bitrate readonlies and management */
 831   if(hi->bitrate_av>0)
 832     vi->bitrate_nominal=hi->bitrate_av;
 833   else{
 834     vi->bitrate_nominal=setting_to_approx_bitrate(vi);
 835   }
 836
 837   vi->bitrate_lower=hi->bitrate_min;
 838   vi->bitrate_upper=hi->bitrate_max;
 839   if(hi->bitrate_av)
 840     vi->bitrate_window=(double)hi->bitrate_reservoir/hi->bitrate_av;
 841   else
 842     vi->bitrate_window=0.;
 843
 844   if(hi->managed){
 845     ci->bi.avg_rate=hi->bitrate_av;
 846     ci->bi.min_rate=hi->bitrate_min;
 847     ci->bi.max_rate=hi->bitrate_max;
 848
 849     ci->bi.reservoir_bits=hi->bitrate_reservoir;
 850     ci->bi.reservoir_bias=
 851       hi->bitrate_reservoir_bias;
 852
 853     ci->bi.slew_damp=hi->bitrate_av_damp;
 854
 855   }
 856
 857   return(0);
 858
 859 }
 860
 861 static void vorbis_encode_setup_setting(vorbis_info *vi,
 862                                        long  channels,
 863                                        long  rate){
 864   int i,is;
 865   codec_setup_info *ci=vi->codec_setup;
 866   highlevel_encode_setup *hi=&ci->hi;
 867   const ve_setup_data_template *setup=hi->setup;
 868   double ds;
 869
 870   vi->version=0;
 871   vi->channels=channels;
 872   vi->rate=rate;
 873
 874   hi->impulse_block_p=1;
 875   hi->noise_normalize_p=1;
 876
 877   is=hi->base_setting;
 878   ds=hi->base_setting-is;
 879
 880   hi->stereo_point_setting=hi->base_setting;
 881
 882   if(!hi->lowpass_altered)
 883     hi->lowpass_kHz=
 884       setup->psy_lowpass[is]*(1.-ds)+setup->psy_lowpass[is+1]*ds;
 885
 886   hi->ath_floating_dB=setup->psy_ath_float[is]*(1.-ds)+
 887     setup->psy_ath_float[is+1]*ds;
 888   hi->ath_absolute_dB=setup->psy_ath_abs[is]*(1.-ds)+
 889     setup->psy_ath_abs[is+1]*ds;
 890
 891   hi->amplitude_track_dBpersec=-6.;
 892   hi->trigger_setting=hi->base_setting;
 893
 894   for(i=0;i<4;i++){
 895     hi->block[i].tone_mask_setting=hi->base_setting;
 896     hi->block[i].tone_peaklimit_setting=hi->base_setting;
 897     hi->block[i].noise_bias_setting=hi->base_setting;
 898     hi->block[i].noise_compand_setting=hi->base_setting;
 899   }
 900 }
 901
 902 int vorbis_encode_setup_vbr(vorbis_info *vi,
 903                             long  channels,
 904                             long  rate,
 905                             float quality){
 906   codec_setup_info *ci;
 907   highlevel_encode_setup *hi;
 908   if(rate<=0) return OV_EINVAL;
 909
 910   ci=vi->codec_setup;
 911   hi=&ci->hi;
 912
 913   quality+=.0000001;
 914   if(quality>=1.)quality=.9999;
 915
 916   hi->req=quality;
 917   hi->setup=get_setup_template(channels,rate,quality,0,&hi->base_setting);
 918   if(!hi->setup)return OV_EIMPL;
 919
 920   vorbis_encode_setup_setting(vi,channels,rate);
 921   hi->managed=0;
 922   hi->coupling_p=1;
 923
 924   return 0;
 925 }
 926
 927 int vorbis_encode_init_vbr(vorbis_info *vi,
 928                            long channels,
 929                            long rate,
 930
 931                            float base_quality /* 0. to 1. */
 932                            ){
 933   int ret=0;
 934
 935   ret=vorbis_encode_setup_vbr(vi,channels,rate,base_quality);
 936
 937   if(ret){
 938     vorbis_info_clear(vi);
 939     return ret;
 940   }
 941   ret=vorbis_encode_setup_init(vi);
 942   if(ret)
 943     vorbis_info_clear(vi);
 944   return(ret);
 945 }
 946
 947 int vorbis_encode_setup_managed(vorbis_info *vi,
 948                                 long channels,
 949                                 long rate,
 950
 951                                 long max_bitrate,
 952                                 long nominal_bitrate,
 953                                 long min_bitrate){
 954
 955   codec_setup_info *ci;
 956   highlevel_encode_setup *hi;
 957   double tnominal;
 958   if(rate<=0) return OV_EINVAL;
 959
 960   ci=vi->codec_setup;
 961   hi=&ci->hi;
 962   tnominal=nominal_bitrate;
 963
 964   if(nominal_bitrate<=0.){
 965     if(max_bitrate>0.){
 966       if(min_bitrate>0.)
 967         nominal_bitrate=(max_bitrate+min_bitrate)*.5;
 968       else
 969         nominal_bitrate=max_bitrate*.875;
 970     }else{
 971       if(min_bitrate>0.){
 972         nominal_bitrate=min_bitrate;
 973       }else{
 974         return(OV_EINVAL);
 975       }
 976     }
 977   }
 978
 979   hi->req=nominal_bitrate;
 980   hi->setup=get_setup_template(channels,rate,nominal_bitrate,1,&hi->base_setting);
 981   if(!hi->setup)return OV_EIMPL;
 982
 983   vorbis_encode_setup_setting(vi,channels,rate);
 984
 985   /* initialize management with sane defaults */
 986   hi->coupling_p=1;
 987   hi->managed=1;
 988   hi->bitrate_min=min_bitrate;
 989   hi->bitrate_max=max_bitrate;
 990   hi->bitrate_av=tnominal;
 991   hi->bitrate_av_damp=1.5f; /* full range in no less than 1.5 second */
 992   hi->bitrate_reservoir=nominal_bitrate*2;
 993   hi->bitrate_reservoir_bias=.1; /* bias toward hoarding bits */
 994
 995   return(0);
 996
 997 }
 998
 999 int vorbis_encode_init(vorbis_info *vi,
1000                        long channels,
1001                        long rate,
1002
1003                        long max_bitrate,
1004                        long nominal_bitrate,
1005                        long min_bitrate){
1006
1007   int ret=vorbis_encode_setup_managed(vi,channels,rate,
1008                                       max_bitrate,
1009                                       nominal_bitrate,
1010                                       min_bitrate);
1011   if(ret){
1012     vorbis_info_clear(vi);
1013     return(ret);
1014   }
1015
1016   ret=vorbis_encode_setup_init(vi);
1017   if(ret)
1018     vorbis_info_clear(vi);
1019   return(ret);
1020 }
1021
1022 int vorbis_encode_ctl(vorbis_info *vi,int number,void *arg){
1023   if(vi){
1024     codec_setup_info *ci=vi->codec_setup;
1025     highlevel_encode_setup *hi=&ci->hi;
1026     int setp=(number&0xf); /* a read request has a low nibble of 0 */
1027
1028     if(setp && hi->set_in_stone)return(OV_EINVAL);
1029
1030     switch(number){
1031
1032     /* now deprecated *****************/
1033     case OV_ECTL_RATEMANAGE_GET:
1034       {
1035
1036         struct ovectl_ratemanage_arg *ai=
1037           (struct ovectl_ratemanage_arg *)arg;
1038
1039         ai->management_active=hi->managed;
1040         ai->bitrate_hard_window=ai->bitrate_av_window=
1041           (double)hi->bitrate_reservoir/vi->rate;
1042         ai->bitrate_av_window_center=1.;
1043         ai->bitrate_hard_min=hi->bitrate_min;
1044         ai->bitrate_hard_max=hi->bitrate_max;
1045         ai->bitrate_av_lo=hi->bitrate_av;
1046         ai->bitrate_av_hi=hi->bitrate_av;
1047
1048       }
1049       return(0);
1050
1051     /* now deprecated *****************/
1052     case OV_ECTL_RATEMANAGE_SET:
1053       {
1054         struct ovectl_ratemanage_arg *ai=
1055           (struct ovectl_ratemanage_arg *)arg;
1056         if(ai==NULL){
1057           hi->managed=0;
1058         }else{
1059           hi->managed=ai->management_active;
1060           vorbis_encode_ctl(vi,OV_ECTL_RATEMANAGE_AVG,arg);
1061           vorbis_encode_ctl(vi,OV_ECTL_RATEMANAGE_HARD,arg);
1062         }
1063       }
1064       return 0;
1065
1066     /* now deprecated *****************/
1067     case OV_ECTL_RATEMANAGE_AVG:
1068       {
1069         struct ovectl_ratemanage_arg *ai=
1070           (struct ovectl_ratemanage_arg *)arg;
1071         if(ai==NULL){
1072           hi->bitrate_av=0;
1073         }else{
1074           hi->bitrate_av=(ai->bitrate_av_lo+ai->bitrate_av_hi)*.5;
1075         }
1076       }
1077       return(0);
1078     /* now deprecated *****************/
1079     case OV_ECTL_RATEMANAGE_HARD:
1080       {
1081         struct ovectl_ratemanage_arg *ai=
1082           (struct ovectl_ratemanage_arg *)arg;
1083         if(ai==NULL){
1084           hi->bitrate_min=0;
1085           hi->bitrate_max=0;
1086         }else{
1087           hi->bitrate_min=ai->bitrate_hard_min;
1088           hi->bitrate_max=ai->bitrate_hard_max;
1089           hi->bitrate_reservoir=ai->bitrate_hard_window*
1090             (hi->bitrate_max+hi->bitrate_min)*.5;
1091         }
1092         if(hi->bitrate_reservoir<128.)
1093           hi->bitrate_reservoir=128.;
1094       }
1095       return(0);
1096
1097       /* replacement ratemanage interface */
1098     case OV_ECTL_RATEMANAGE2_GET:
1099       {
1100         struct ovectl_ratemanage2_arg *ai=
1101           (struct ovectl_ratemanage2_arg *)arg;
1102         if(ai==NULL)return OV_EINVAL;
1103
1104         ai->management_active=hi->managed;
1105         ai->bitrate_limit_min_kbps=hi->bitrate_min/1000;
1106         ai->bitrate_limit_max_kbps=hi->bitrate_max/1000;
1107         ai->bitrate_average_kbps=hi->bitrate_av/1000;
1108         ai->bitrate_average_damping=hi->bitrate_av_damp;
1109         ai->bitrate_limit_reservoir_bits=hi->bitrate_reservoir;
1110         ai->bitrate_limit_reservoir_bias=hi->bitrate_reservoir_bias;
1111       }
1112       return (0);
1113     case OV_ECTL_RATEMANAGE2_SET:
1114       {
1115         struct ovectl_ratemanage2_arg *ai=
1116           (struct ovectl_ratemanage2_arg *)arg;
1117         if(ai==NULL){
1118           hi->managed=0;
1119         }else{
1120           /* sanity check; only catch invariant violations */
1121           if(ai->bitrate_limit_min_kbps>0 &&
1122              ai->bitrate_average_kbps>0 &&
1123              ai->bitrate_limit_min_kbps>ai->bitrate_average_kbps)
1124             return OV_EINVAL;
1125
1126           if(ai->bitrate_limit_max_kbps>0 &&
1127              ai->bitrate_average_kbps>0 &&
1128              ai->bitrate_limit_max_kbps<ai->bitrate_average_kbps)
1129             return OV_EINVAL;
1130
1131           if(ai->bitrate_limit_min_kbps>0 &&
1132              ai->bitrate_limit_max_kbps>0 &&
1133              ai->bitrate_limit_min_kbps>ai->bitrate_limit_max_kbps)
1134             return OV_EINVAL;
1135
1136           if(ai->bitrate_average_damping <= 0.)
1137             return OV_EINVAL;
1138
1139           if(ai->bitrate_limit_reservoir_bits < 0)
1140             return OV_EINVAL;
1141
1142           if(ai->bitrate_limit_reservoir_bias < 0.)
1143             return OV_EINVAL;
1144
1145           if(ai->bitrate_limit_reservoir_bias > 1.)
1146             return OV_EINVAL;
1147
1148           hi->managed=ai->management_active;
1149           hi->bitrate_min=ai->bitrate_limit_min_kbps * 1000;
1150           hi->bitrate_max=ai->bitrate_limit_max_kbps * 1000;
1151           hi->bitrate_av=ai->bitrate_average_kbps * 1000;
1152           hi->bitrate_av_damp=ai->bitrate_average_damping;
1153           hi->bitrate_reservoir=ai->bitrate_limit_reservoir_bits;
1154           hi->bitrate_reservoir_bias=ai->bitrate_limit_reservoir_bias;
1155         }
1156       }
1157       return 0;
1158
1159     case OV_ECTL_LOWPASS_GET:
1160       {
1161         double *farg=(double *)arg;
1162         *farg=hi->lowpass_kHz;
1163       }
1164       return(0);
1165     case OV_ECTL_LOWPASS_SET:
1166       {
1167         double *farg=(double *)arg;
1168         hi->lowpass_kHz=*farg;
1169
1170         if(hi->lowpass_kHz<2.)hi->lowpass_kHz=2.;
1171         if(hi->lowpass_kHz>99.)hi->lowpass_kHz=99.;
1172         hi->lowpass_altered=1;
1173       }
1174       return(0);
1175     case OV_ECTL_IBLOCK_GET:
1176       {
1177         double *farg=(double *)arg;
1178         *farg=hi->impulse_noisetune;
1179       }
1180       return(0);
1181     case OV_ECTL_IBLOCK_SET:
1182       {
1183         double *farg=(double *)arg;
1184         hi->impulse_noisetune=*farg;
1185
1186         if(hi->impulse_noisetune>0.)hi->impulse_noisetune=0.;
1187         if(hi->impulse_noisetune<-15.)hi->impulse_noisetune=-15.;
1188       }
1189       return(0);
1190     case OV_ECTL_COUPLING_GET:
1191       {
1192         int *iarg=(int *)arg;
1193         *iarg=hi->coupling_p;
1194       }
1195       return(0);
1196     case OV_ECTL_COUPLING_SET:
1197       {
1198         const void *new_template;
1199         double new_base=0.;
1200         int *iarg=(int *)arg;
1201         hi->coupling_p=((*iarg)!=0);
1202
1203         /* Fetching a new template can alter the base_setting, which
1204            many other parameters are based on.  Right now, the only
1205            parameter drawn from the base_setting that can be altered
1206            by an encctl is the lowpass, so that is explictly flagged
1207            to not be overwritten when we fetch a new template and
1208            recompute the dependant settings */
1209         new_template = get_setup_template(hi->coupling_p?vi->channels:-1,
1210                                           vi->rate,
1211                                           hi->req,
1212                                           hi->managed,
1213                                           &new_base);
1214         if(!new_template)return OV_EIMPL;
1215         hi->setup=new_template;
1216         hi->base_setting=new_base;
1217         vorbis_encode_setup_setting(vi,vi->channels,vi->rate);
1218       }
1219       return(0);
1220     }
1221     return(OV_EIMPL);
1222   }
1223   return(OV_EINVAL);
1224 }