dlls/winemp3.acm/layer3.c

   1 /*
   2  * Mpeg Layer-3 audio decoder
   3  * --------------------------
   4  * copyright (c) 1995,1996,1997 by Michael Hipp.
   5  * All rights reserved. See also 'README'
   6  * This file has been copied from mpglib.
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  21  */
  22
  23 #include <stdlib.h>
  24 #include "mpg123.h"
  25 #include "mpglib.h"
  26 #include "huffman.h"
  27
  28 extern struct mpstr *gmp;
  29
  30 #define MPEG1
  31
  32
  33 static real ispow[8207];
  34 static real aa_ca[8],aa_cs[8];
  35 static real COS1[12][6];
  36 static real win[4][36];
  37 static real win1[4][36];
  38 static real gainpow2[256+118+4];
  39 static real COS9[9];
  40 static real COS6_1,COS6_2;
  41 static real tfcos36[9];
  42 static real tfcos12[3];
  43
  44 struct bandInfoStruct {
  45   short longIdx[23];
  46   short longDiff[22];
  47   short shortIdx[14];
  48   short shortDiff[13];
  49 };
  50
  51 int longLimit[9][23];
  52 int shortLimit[9][14];
  53
  54 struct bandInfoStruct bandInfo[9] = {
  55
  56 /* MPEG 1.0 */
  57  { {0,4,8,12,16,20,24,30,36,44,52,62,74, 90,110,134,162,196,238,288,342,418,576},
  58    {4,4,4,4,4,4,6,6,8, 8,10,12,16,20,24,28,34,42,50,54, 76,158},
  59    {0,4*3,8*3,12*3,16*3,22*3,30*3,40*3,52*3,66*3, 84*3,106*3,136*3,192*3},
  60    {4,4,4,4,6,8,10,12,14,18,22,30,56} } ,
  61
  62  { {0,4,8,12,16,20,24,30,36,42,50,60,72, 88,106,128,156,190,230,276,330,384,576},
  63    {4,4,4,4,4,4,6,6,6, 8,10,12,16,18,22,28,34,40,46,54, 54,192},
  64    {0,4*3,8*3,12*3,16*3,22*3,28*3,38*3,50*3,64*3, 80*3,100*3,126*3,192*3},
  65    {4,4,4,4,6,6,10,12,14,16,20,26,66} } ,
  66
  67  { {0,4,8,12,16,20,24,30,36,44,54,66,82,102,126,156,194,240,296,364,448,550,576} ,
  68    {4,4,4,4,4,4,6,6,8,10,12,16,20,24,30,38,46,56,68,84,102, 26} ,
  69    {0,4*3,8*3,12*3,16*3,22*3,30*3,42*3,58*3,78*3,104*3,138*3,180*3,192*3} ,
  70    {4,4,4,4,6,8,12,16,20,26,34,42,12} }  ,
  71
  72 /* MPEG 2.0 */
  73  { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576},
  74    {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54 } ,
  75    {0,4*3,8*3,12*3,18*3,24*3,32*3,42*3,56*3,74*3,100*3,132*3,174*3,192*3} ,
  76    {4,4,4,6,6,8,10,14,18,26,32,42,18 } } ,
  77
  78  { {0,6,12,18,24,30,36,44,54,66,80,96,114,136,162,194,232,278,330,394,464,540,576},
  79    {6,6,6,6,6,6,8,10,12,14,16,18,22,26,32,38,46,52,64,70,76,36 } ,
  80    {0,4*3,8*3,12*3,18*3,26*3,36*3,48*3,62*3,80*3,104*3,136*3,180*3,192*3} ,
  81    {4,4,4,6,8,10,12,14,18,24,32,44,12 } } ,
  82
  83  { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576},
  84    {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54 },
  85    {0,4*3,8*3,12*3,18*3,26*3,36*3,48*3,62*3,80*3,104*3,134*3,174*3,192*3},
  86    {4,4,4,6,8,10,12,14,18,24,30,40,18 } } ,
  87 /* MPEG 2.5 */
  88  { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576} ,
  89    {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54},
  90    {0,12,24,36,54,78,108,144,186,240,312,402,522,576},
  91    {4,4,4,6,8,10,12,14,18,24,30,40,18} },
  92  { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576} ,
  93    {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54},
  94    {0,12,24,36,54,78,108,144,186,240,312,402,522,576},
  95    {4,4,4,6,8,10,12,14,18,24,30,40,18} },
  96  { {0,12,24,36,48,60,72,88,108,132,160,192,232,280,336,400,476,566,568,570,572,574,576},
  97    {12,12,12,12,12,12,16,20,24,28,32,40,48,56,64,76,90,2,2,2,2,2},
  98    {0, 24, 48, 72,108,156,216,288,372,480,486,492,498,576},
  99    {8,8,8,12,16,20,24,28,36,2,2,2,26} } ,
 100 };
 101
 102 static int mapbuf0[9][152];
 103 static int mapbuf1[9][156];
 104 static int mapbuf2[9][44];
 105 static int *map[9][3];
 106 static int *mapend[9][3];
 107
 108 static unsigned int n_slen2[512]; /* MPEG 2.0 slen for 'normal' mode */
 109 static unsigned int i_slen2[256]; /* MPEG 2.0 slen for intensity stereo */
 110
 111 static real tan1_1[16],tan2_1[16],tan1_2[16],tan2_2[16];
 112 static real pow1_1[2][16],pow2_1[2][16],pow1_2[2][16],pow2_2[2][16];
 113
 114 /*
 115  * init tables for layer-3
 116  */
 117 void init_layer3(int down_sample_sblimit)
 118 {
 119   int i,j,k,l;
 120
 121   for(i=-256;i<118+4;i++)
 122     gainpow2[i+256] = pow((double)2.0,-0.25 * (double) (i+210) );
 123
 124   for(i=0;i<8207;i++)
 125     ispow[i] = pow((double)i,(double)4.0/3.0);
 126
 127   for (i=0;i<8;i++)
 128   {
 129     static double Ci[8]={-0.6,-0.535,-0.33,-0.185,-0.095,-0.041,-0.0142,-0.0037};
 130     double sq=sqrt(1.0+Ci[i]*Ci[i]);
 131     aa_cs[i] = 1.0/sq;
 132     aa_ca[i] = Ci[i]/sq;
 133   }
 134
 135   for(i=0;i<18;i++)
 136   {
 137     win[0][i]    = win[1][i]    = 0.5 * sin( M_PI / 72.0 * (double) (2*(i+0) +1) ) / cos ( M_PI * (double) (2*(i+0) +19) / 72.0 );
 138     win[0][i+18] = win[3][i+18] = 0.5 * sin( M_PI / 72.0 * (double) (2*(i+18)+1) ) / cos ( M_PI * (double) (2*(i+18)+19) / 72.0 );
 139   }
 140   for(i=0;i<6;i++)
 141   {
 142     win[1][i+18] = 0.5 / cos ( M_PI * (double) (2*(i+18)+19) / 72.0 );
 143     win[3][i+12] = 0.5 / cos ( M_PI * (double) (2*(i+12)+19) / 72.0 );
 144     win[1][i+24] = 0.5 * sin( M_PI / 24.0 * (double) (2*i+13) ) / cos ( M_PI * (double) (2*(i+24)+19) / 72.0 );
 145     win[1][i+30] = win[3][i] = 0.0;
 146     win[3][i+6 ] = 0.5 * sin( M_PI / 24.0 * (double) (2*i+1) )  / cos ( M_PI * (double) (2*(i+6 )+19) / 72.0 );
 147   }
 148
 149   for(i=0;i<9;i++)
 150     COS9[i] = cos( M_PI / 18.0 * (double) i);
 151
 152   for(i=0;i<9;i++)
 153     tfcos36[i] = 0.5 / cos ( M_PI * (double) (i*2+1) / 36.0 );
 154   for(i=0;i<3;i++)
 155     tfcos12[i] = 0.5 / cos ( M_PI * (double) (i*2+1) / 12.0 );
 156
 157   COS6_1 = cos( M_PI / 6.0 * (double) 1);
 158   COS6_2 = cos( M_PI / 6.0 * (double) 2);
 159
 160   for(i=0;i<12;i++)
 161   {
 162     win[2][i]  = 0.5 * sin( M_PI / 24.0 * (double) (2*i+1) ) / cos ( M_PI * (double) (2*i+7) / 24.0 );
 163     for(j=0;j<6;j++)
 164       COS1[i][j] = cos( M_PI / 24.0 * (double) ((2*i+7)*(2*j+1)) );
 165   }
 166
 167   for(j=0;j<4;j++) {
 168     static int len[4] = { 36,36,12,36 };
 169     for(i=0;i<len[j];i+=2)
 170       win1[j][i] = + win[j][i];
 171     for(i=1;i<len[j];i+=2)
 172       win1[j][i] = - win[j][i];
 173   }
 174
 175   for(i=0;i<16;i++)
 176   {
 177     double t = tan( (double) i * M_PI / 12.0 );
 178     tan1_1[i] = t / (1.0+t);
 179     tan2_1[i] = 1.0 / (1.0 + t);
 180     tan1_2[i] = M_SQRT2 * t / (1.0+t);
 181     tan2_2[i] = M_SQRT2 / (1.0 + t);
 182
 183     for(j=0;j<2;j++) {
 184       double base = pow(2.0,-0.25*(j+1.0));
 185       double p1=1.0,p2=1.0;
 186       if(i > 0) {
 187         if( i & 1 )
 188           p1 = pow(base,(i+1.0)*0.5);
 189         else
 190           p2 = pow(base,i*0.5);
 191       }
 192       pow1_1[j][i] = p1;
 193       pow2_1[j][i] = p2;
 194       pow1_2[j][i] = M_SQRT2 * p1;
 195       pow2_2[j][i] = M_SQRT2 * p2;
 196     }
 197   }
 198
 199   for(j=0;j<9;j++)
 200   {
 201    struct bandInfoStruct *bi = &bandInfo[j];
 202    int *mp;
 203    int cb,lwin;
 204    short *bdf;
 205
 206    mp = map[j][0] = mapbuf0[j];
 207    bdf = bi->longDiff;
 208    for(i=0,cb = 0; cb < 8 ; cb++,i+=*bdf++) {
 209      *mp++ = (*bdf) >> 1;
 210      *mp++ = i;
 211      *mp++ = 3;
 212      *mp++ = cb;
 213    }
 214    bdf = bi->shortDiff+3;
 215    for(cb=3;cb<13;cb++) {
 216      int l = (*bdf++) >> 1;
 217      for(lwin=0;lwin<3;lwin++) {
 218        *mp++ = l;
 219        *mp++ = i + lwin;
 220        *mp++ = lwin;
 221        *mp++ = cb;
 222      }
 223      i += 6*l;
 224    }
 225    mapend[j][0] = mp;
 226
 227    mp = map[j][1] = mapbuf1[j];
 228    bdf = bi->shortDiff+0;
 229    for(i=0,cb=0;cb<13;cb++) {
 230      int l = (*bdf++) >> 1;
 231      for(lwin=0;lwin<3;lwin++) {
 232        *mp++ = l;
 233        *mp++ = i + lwin;
 234        *mp++ = lwin;
 235        *mp++ = cb;
 236      }
 237      i += 6*l;
 238    }
 239    mapend[j][1] = mp;
 240
 241    mp = map[j][2] = mapbuf2[j];
 242    bdf = bi->longDiff;
 243    for(cb = 0; cb < 22 ; cb++) {
 244      *mp++ = (*bdf++) >> 1;
 245      *mp++ = cb;
 246    }
 247    mapend[j][2] = mp;
 248
 249   }
 250
 251   for(j=0;j<9;j++) {
 252     for(i=0;i<23;i++) {
 253       longLimit[j][i] = (bandInfo[j].longIdx[i] - 1 + 8) / 18 + 1;
 254       if(longLimit[j][i] > (down_sample_sblimit) )
 255         longLimit[j][i] = down_sample_sblimit;
 256     }
 257     for(i=0;i<14;i++) {
 258       shortLimit[j][i] = (bandInfo[j].shortIdx[i] - 1) / 18 + 1;
 259       if(shortLimit[j][i] > (down_sample_sblimit) )
 260         shortLimit[j][i] = down_sample_sblimit;
 261     }
 262   }
 263
 264   for(i=0;i<5;i++) {
 265     for(j=0;j<6;j++) {
 266       for(k=0;k<6;k++) {
 267         int n = k + j * 6 + i * 36;
 268         i_slen2[n] = i|(j<<3)|(k<<6)|(3<<12);
 269       }
 270     }
 271   }
 272   for(i=0;i<4;i++) {
 273     for(j=0;j<4;j++) {
 274       for(k=0;k<4;k++) {
 275         int n = k + j * 4 + i * 16;
 276         i_slen2[n+180] = i|(j<<3)|(k<<6)|(4<<12);
 277       }
 278     }
 279   }
 280   for(i=0;i<4;i++) {
 281     for(j=0;j<3;j++) {
 282       int n = j + i * 3;
 283       i_slen2[n+244] = i|(j<<3) | (5<<12);
 284       n_slen2[n+500] = i|(j<<3) | (2<<12) | (1<<15);
 285     }
 286   }
 287
 288   for(i=0;i<5;i++) {
 289     for(j=0;j<5;j++) {
 290       for(k=0;k<4;k++) {
 291         for(l=0;l<4;l++) {
 292           int n = l + k * 4 + j * 16 + i * 80;
 293           n_slen2[n] = i|(j<<3)|(k<<6)|(l<<9)|(0<<12);
 294         }
 295       }
 296     }
 297   }
 298   for(i=0;i<5;i++) {
 299     for(j=0;j<5;j++) {
 300       for(k=0;k<4;k++) {
 301         int n = k + j * 4 + i * 20;
 302         n_slen2[n+400] = i|(j<<3)|(k<<6)|(1<<12);
 303       }
 304     }
 305   }
 306 }
 307
 308 /*
 309  * read additional side information
 310  */
 311 #ifdef MPEG1
 312 static int III_get_side_info_1(struct III_sideinfo *si,int stereo,
 313  int ms_stereo,long sfreq,int single)
 314 {
 315    int ch, gr;
 316    int powdiff = (single == 3) ? 4 : 0;
 317
 318    si->main_data_begin = getbits(9);
 319    if (stereo == 1)
 320      si->private_bits = getbits_fast(5);
 321    else
 322      si->private_bits = getbits_fast(3);
 323
 324    for (ch=0; ch<stereo; ch++) {
 325        si->ch[ch].gr[0].scfsi = -1;
 326        si->ch[ch].gr[1].scfsi = getbits_fast(4);
 327    }
 328
 329    for (gr=0; gr<2; gr++)
 330    {
 331      for (ch=0; ch<stereo; ch++)
 332      {
 333        register struct gr_info_s *gr_info = &(si->ch[ch].gr[gr]);
 334
 335        gr_info->part2_3_length = getbits(12);
 336        gr_info->big_values = getbits_fast(9);
 337        if(gr_info->big_values > 288) {
 338           fprintf(stderr,"big_values too large!\n");
 339           gr_info->big_values = 288;
 340        }
 341        gr_info->pow2gain = gainpow2+256 - getbits_fast(8) + powdiff;
 342        if(ms_stereo)
 343          gr_info->pow2gain += 2;
 344        gr_info->scalefac_compress = getbits_fast(4);
 345 /* window-switching flag == 1 for block_Type != 0 .. and block-type == 0 -> win-sw-flag = 0 */
 346        if(get1bit())
 347        {
 348          int i;
 349          gr_info->block_type = getbits_fast(2);
 350          gr_info->mixed_block_flag = get1bit();
 351          gr_info->table_select[0] = getbits_fast(5);
 352          gr_info->table_select[1] = getbits_fast(5);
 353          /*
 354           * table_select[2] not needed, because there is no region2,
 355           * but to satisfy some verifications tools we set it either.
 356           */
 357          gr_info->table_select[2] = 0;
 358          for(i=0;i<3;i++)
 359            gr_info->full_gain[i] = gr_info->pow2gain + (getbits_fast(3)<<3);
 360
 361          if(gr_info->block_type == 0) {
 362            fprintf(stderr,"Blocktype == 0 and window-switching == 1 not allowed.\n");
 363            return 0;
 364          }
 365          /* region_count/start parameters are implicit in this case. */
 366          gr_info->region1start = 36>>1;
 367          gr_info->region2start = 576>>1;
 368        }
 369        else
 370        {
 371          int i,r0c,r1c;
 372          for (i=0; i<3; i++)
 373            gr_info->table_select[i] = getbits_fast(5);
 374          r0c = getbits_fast(4);
 375          r1c = getbits_fast(3);
 376          gr_info->region1start = bandInfo[sfreq].longIdx[r0c+1] >> 1 ;
 377          gr_info->region2start = bandInfo[sfreq].longIdx[r0c+1+r1c+1] >> 1;
 378          gr_info->block_type = 0;
 379          gr_info->mixed_block_flag = 0;
 380        }
 381        gr_info->preflag = get1bit();
 382        gr_info->scalefac_scale = get1bit();
 383        gr_info->count1table_select = get1bit();
 384      }
 385    }
 386    return !0;
 387 }
 388 #endif
 389
 390 /*
 391  * Side Info for MPEG 2.0 / LSF
 392  */
 393 static int III_get_side_info_2(struct III_sideinfo *si,int stereo,
 394  int ms_stereo,long sfreq,int single)
 395 {
 396    int ch;
 397    int powdiff = (single == 3) ? 4 : 0;
 398
 399    si->main_data_begin = getbits(8);
 400    if (stereo == 1)
 401      si->private_bits = get1bit();
 402    else
 403      si->private_bits = getbits_fast(2);
 404
 405    for (ch=0; ch<stereo; ch++)
 406    {
 407        register struct gr_info_s *gr_info = &(si->ch[ch].gr[0]);
 408
 409        gr_info->part2_3_length = getbits(12);
 410        gr_info->big_values = getbits_fast(9);
 411        if(gr_info->big_values > 288) {
 412          fprintf(stderr,"big_values too large!\n");
 413          gr_info->big_values = 288;
 414        }
 415        gr_info->pow2gain = gainpow2+256 - getbits_fast(8) + powdiff;
 416        if(ms_stereo)
 417          gr_info->pow2gain += 2;
 418        gr_info->scalefac_compress = getbits(9);
 419 /* window-switching flag == 1 for block_Type != 0 .. and block-type == 0 -> win-sw-flag = 0 */
 420        if(get1bit())
 421        {
 422          int i;
 423          gr_info->block_type = getbits_fast(2);
 424          gr_info->mixed_block_flag = get1bit();
 425          gr_info->table_select[0] = getbits_fast(5);
 426          gr_info->table_select[1] = getbits_fast(5);
 427          /*
 428           * table_select[2] not needed, because there is no region2,
 429           * but to satisfy some verifications tools we set it either.
 430           */
 431          gr_info->table_select[2] = 0;
 432          for(i=0;i<3;i++)
 433            gr_info->full_gain[i] = gr_info->pow2gain + (getbits_fast(3)<<3);
 434
 435          if(gr_info->block_type == 0) {
 436            fprintf(stderr,"Blocktype == 0 and window-switching == 1 not allowed.\n");
 437            return 0;
 438          }
 439          /* region_count/start parameters are implicit in this case. */
 440 /* check this again! */
 441          if(gr_info->block_type == 2)
 442            gr_info->region1start = 36>>1;
 443          else if(sfreq == 8)
 444 /* check this for 2.5 and sfreq=8 */
 445            gr_info->region1start = 108>>1;
 446          else
 447            gr_info->region1start = 54>>1;
 448          gr_info->region2start = 576>>1;
 449        }
 450        else
 451        {
 452          int i,r0c,r1c;
 453          for (i=0; i<3; i++)
 454            gr_info->table_select[i] = getbits_fast(5);
 455          r0c = getbits_fast(4);
 456          r1c = getbits_fast(3);
 457          gr_info->region1start = bandInfo[sfreq].longIdx[r0c+1] >> 1 ;
 458          gr_info->region2start = bandInfo[sfreq].longIdx[r0c+1+r1c+1] >> 1;
 459          gr_info->block_type = 0;
 460          gr_info->mixed_block_flag = 0;
 461        }
 462        gr_info->scalefac_scale = get1bit();
 463        gr_info->count1table_select = get1bit();
 464    }
 465    return !0;
 466 }
 467
 468 /*
 469  * read scalefactors
 470  */
 471 #ifdef MPEG1
 472 static int III_get_scale_factors_1(int *scf,struct gr_info_s *gr_info)
 473 {
 474    static const unsigned char slen[2][16] = {
 475      {0, 0, 0, 0, 3, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4},
 476      {0, 1, 2, 3, 0, 1, 2, 3, 1, 2, 3, 1, 2, 3, 2, 3}
 477    };
 478    int numbits;
 479    int num0 = slen[0][gr_info->scalefac_compress];
 480    int num1 = slen[1][gr_info->scalefac_compress];
 481
 482     if (gr_info->block_type == 2) {
 483       int i=18;
 484       numbits = (num0 + num1) * 18;
 485
 486       if (gr_info->mixed_block_flag) {
 487          for (i=8;i;i--)
 488            *scf++ = getbits_fast(num0);
 489          i = 9;
 490          numbits -= num0; /* num0 * 17 + num1 * 18 */
 491       }
 492
 493       for (;i;i--)
 494         *scf++ = getbits_fast(num0);
 495       for (i = 18; i; i--)
 496         *scf++ = getbits_fast(num1);
 497       *scf++ = 0; *scf++ = 0; *scf++ = 0; /* short[13][0..2] = 0 */
 498     }
 499     else {
 500       int i;
 501       int scfsi = gr_info->scfsi;
 502
 503       if(scfsi < 0) { /* scfsi < 0 => granule == 0 */
 504          for(i=11;i;i--)
 505            *scf++ = getbits_fast(num0);
 506          for(i=10;i;i--)
 507            *scf++ = getbits_fast(num1);
 508          numbits = (num0 + num1) * 10 + num0;
 509          *scf++ = 0;
 510       }
 511       else {
 512         numbits = 0;
 513         if(!(scfsi & 0x8)) {
 514           for (i=0;i<6;i++)
 515             *scf++ = getbits_fast(num0);
 516           numbits += num0 * 6;
 517         }
 518         else {
 519           scf += 6;
 520         }
 521
 522         if(!(scfsi & 0x4)) {
 523           for (i=0;i<5;i++)
 524             *scf++ = getbits_fast(num0);
 525           numbits += num0 * 5;
 526         }
 527         else {
 528           scf += 5;
 529         }
 530
 531         if(!(scfsi & 0x2)) {
 532           for(i=0;i<5;i++)
 533             *scf++ = getbits_fast(num1);
 534           numbits += num1 * 5;
 535         }
 536         else {
 537           scf += 5;
 538         }
 539
 540         if(!(scfsi & 0x1)) {
 541           for (i=0;i<5;i++)
 542             *scf++ = getbits_fast(num1);
 543           numbits += num1 * 5;
 544         }
 545         else {
 546            scf += 5;
 547         }
 548         *scf++ = 0;  /* no l[21] in original sources */
 549       }
 550     }
 551     return numbits;
 552 }
 553 #endif
 554
 555
 556 static int III_get_scale_factors_2(int *scf,struct gr_info_s *gr_info,int i_stereo)
 557 {
 558   unsigned char *pnt;
 559   int i,j;
 560   unsigned int slen;
 561   int n = 0;
 562   int numbits = 0;
 563
 564   static unsigned char stab[3][6][4] = {
 565    { { 6, 5, 5,5 } , { 6, 5, 7,3 } , { 11,10,0,0} ,
 566      { 7, 7, 7,0 } , { 6, 6, 6,3 } , {  8, 8,5,0} } ,
 567    { { 9, 9, 9,9 } , { 9, 9,12,6 } , { 18,18,0,0} ,
 568      {12,12,12,0 } , {12, 9, 9,6 } , { 15,12,9,0} } ,
 569    { { 6, 9, 9,9 } , { 6, 9,12,6 } , { 15,18,0,0} ,
 570      { 6,15,12,0 } , { 6,12, 9,6 } , {  6,18,9,0} } };
 571
 572   if(i_stereo) /* i_stereo AND second channel -> do_layer3() checks this */
 573     slen = i_slen2[gr_info->scalefac_compress>>1];
 574   else
 575     slen = n_slen2[gr_info->scalefac_compress];
 576
 577   gr_info->preflag = (slen>>15) & 0x1;
 578
 579   n = 0;
 580   if( gr_info->block_type == 2 ) {
 581     n++;
 582     if(gr_info->mixed_block_flag)
 583       n++;
 584   }
 585
 586   pnt = stab[n][(slen>>12)&0x7];
 587
 588   for(i=0;i<4;i++) {
 589     int num = slen & 0x7;
 590     slen >>= 3;
 591     if(num) {
 592       for(j=0;j<(int)(pnt[i]);j++)
 593         *scf++ = getbits_fast(num);
 594       numbits += pnt[i] * num;
 595     }
 596     else {
 597       for(j=0;j<(int)(pnt[i]);j++)
 598         *scf++ = 0;
 599     }
 600   }
 601
 602   n = (n << 1) + 1;
 603   for(i=0;i<n;i++)
 604     *scf++ = 0;
 605
 606   return numbits;
 607 }
 608
 609 static int pretab1[22] = {0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,2,2,3,3,3,2,0};
 610 static int pretab2[22] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
 611
 612 /*
 613  * don't forget to apply the same changes to III_dequantize_sample_ms() !!!
 614  */
 615 static int III_dequantize_sample(real xr[SBLIMIT][SSLIMIT],int *scf,
 616    struct gr_info_s *gr_info,int sfreq,int part2bits)
 617 {
 618   int shift = 1 + gr_info->scalefac_scale;
 619   real *xrpnt = (real *) xr;
 620   int l[3],l3;
 621   int part2remain = gr_info->part2_3_length - part2bits;
 622   int *me;
 623
 624   {
 625     int bv       = gr_info->big_values;
 626     int region1  = gr_info->region1start;
 627     int region2  = gr_info->region2start;
 628
 629     l3 = ((576>>1)-bv)>>1;
 630 /*
 631  * we may lose the 'odd' bit here !!
 632  * check this later again
 633  */
 634     if(bv <= region1) {
 635       l[0] = bv; l[1] = 0; l[2] = 0;
 636     }
 637     else {
 638       l[0] = region1;
 639       if(bv <= region2) {
 640         l[1] = bv - l[0];  l[2] = 0;
 641       }
 642       else {
 643         l[1] = region2 - l[0]; l[2] = bv - region2;
 644       }
 645     }
 646   }
 647
 648   if(gr_info->block_type == 2) {
 649     /*
 650      * decoding with short or mixed mode BandIndex table
 651      */
 652     int i,max[4];
 653     int step=0,lwin=0,cb=0;
 654     register real v = 0.0;
 655     register int *m,mc;
 656
 657     if(gr_info->mixed_block_flag) {
 658       max[3] = -1;
 659       max[0] = max[1] = max[2] = 2;
 660       m = map[sfreq][0];
 661       me = mapend[sfreq][0];
 662     }
 663     else {
 664       max[0] = max[1] = max[2] = max[3] = -1;
 665       /* max[3] not really needed in this case */
 666       m = map[sfreq][1];
 667       me = mapend[sfreq][1];
 668     }
 669
 670     mc = 0;
 671     for(i=0;i<2;i++) {
 672       int lp = l[i];
 673       struct newhuff *h = ht+gr_info->table_select[i];
 674       for(;lp;lp--,mc--) {
 675         register int x,y;
 676         if( (!mc) ) {
 677           mc = *m++;
 678           xrpnt = ((real *) xr) + (*m++);
 679           lwin = *m++;
 680           cb = *m++;
 681           if(lwin == 3) {
 682             v = gr_info->pow2gain[(*scf++) << shift];
 683             step = 1;
 684           }
 685           else {
 686             v = gr_info->full_gain[lwin][(*scf++) << shift];
 687             step = 3;
 688           }
 689         }
 690         {
 691           register short *val = h->table;
 692           while((y=*val++)<0) {
 693             if (get1bit())
 694               val -= y;
 695             part2remain--;
 696           }
 697           x = y >> 4;
 698           y &= 0xf;
 699         }
 700         if(x == 15) {
 701           max[lwin] = cb;
 702           part2remain -= h->linbits+1;
 703           x += getbits(h->linbits);
 704           if(get1bit())
 705             *xrpnt = -ispow[x] * v;
 706           else
 707             *xrpnt =  ispow[x] * v;
 708         }
 709         else if(x) {
 710           max[lwin] = cb;
 711           if(get1bit())
 712             *xrpnt = -ispow[x] * v;
 713           else
 714             *xrpnt =  ispow[x] * v;
 715           part2remain--;
 716         }
 717         else
 718           *xrpnt = 0.0;
 719         xrpnt += step;
 720         if(y == 15) {
 721           max[lwin] = cb;
 722           part2remain -= h->linbits+1;
 723           y += getbits(h->linbits);
 724           if(get1bit())
 725             *xrpnt = -ispow[y] * v;
 726           else
 727             *xrpnt =  ispow[y] * v;
 728         }
 729         else if(y) {
 730           max[lwin] = cb;
 731           if(get1bit())
 732             *xrpnt = -ispow[y] * v;
 733           else
 734             *xrpnt =  ispow[y] * v;
 735           part2remain--;
 736         }
 737         else
 738           *xrpnt = 0.0;
 739         xrpnt += step;
 740       }
 741     }
 742     for(;l3 && (part2remain > 0);l3--) {
 743       struct newhuff *h = htc+gr_info->count1table_select;
 744       register short *val = h->table,a;
 745
 746       while((a=*val++)<0) {
 747         part2remain--;
 748         if(part2remain < 0) {
 749           part2remain++;
 750           a = 0;
 751           break;
 752         }
 753         if (get1bit())
 754           val -= a;
 755       }
 756
 757       for(i=0;i<4;i++) {
 758         if(!(i & 1)) {
 759           if(!mc) {
 760             mc = *m++;
 761             xrpnt = ((real *) xr) + (*m++);
 762             lwin = *m++;
 763             cb = *m++;
 764             if(lwin == 3) {
 765               v = gr_info->pow2gain[(*scf++) << shift];
 766               step = 1;
 767             }
 768             else {
 769               v = gr_info->full_gain[lwin][(*scf++) << shift];
 770               step = 3;
 771             }
 772           }
 773           mc--;
 774         }
 775         if( (a & (0x8>>i)) ) {
 776           max[lwin] = cb;
 777           part2remain--;
 778           if(part2remain < 0) {
 779             part2remain++;
 780             break;
 781           }
 782           if(get1bit())
 783             *xrpnt = -v;
 784           else
 785             *xrpnt = v;
 786         }
 787         else
 788           *xrpnt = 0.0;
 789         xrpnt += step;
 790       }
 791     }
 792
 793     while( m < me ) {
 794       if(!mc) {
 795         mc = *m++;
 796         xrpnt = ((real *) xr) + *m++;
 797         if( (*m++) == 3)
 798           step = 1;
 799         else
 800           step = 3;
 801         m++; /* cb */
 802       }
 803       mc--;
 804       *xrpnt = 0.0;
 805       xrpnt += step;
 806       *xrpnt = 0.0;
 807       xrpnt += step;
 808 /* we could add a little opt. here:
 809  * if we finished a band for window 3 or a long band
 810  * further bands could copied in a simple loop without a
 811  * special 'map' decoding
 812  */
 813     }
 814
 815     gr_info->maxband[0] = max[0]+1;
 816     gr_info->maxband[1] = max[1]+1;
 817     gr_info->maxband[2] = max[2]+1;
 818     gr_info->maxbandl = max[3]+1;
 819
 820     {
 821       int rmax = max[0] > max[1] ? max[0] : max[1];
 822       rmax = (rmax > max[2] ? rmax : max[2]) + 1;
 823       gr_info->maxb = rmax ? shortLimit[sfreq][rmax] : longLimit[sfreq][max[3]+1];
 824     }
 825
 826   }
 827   else {
 828         /*
 829      * decoding with 'long' BandIndex table (block_type != 2)
 830      */
 831     int *pretab = gr_info->preflag ? pretab1 : pretab2;
 832     int i,max = -1;
 833     int cb = 0;
 834     register int *m = map[sfreq][2];
 835     register real v = 0.0;
 836     register int mc = 0;
 837 #if 0
 838     me = mapend[sfreq][2];
 839 #endif
 840
 841         /*
 842      * long hash table values
 843      */
 844     for(i=0;i<3;i++) {
 845       int lp = l[i];
 846       struct newhuff *h = ht+gr_info->table_select[i];
 847
 848       for(;lp;lp--,mc--) {
 849         int x,y;
 850
 851         if(!mc) {
 852           mc = *m++;
 853           v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift];
 854           cb = *m++;
 855         }
 856         {
 857           register short *val = h->table;
 858           while((y=*val++)<0) {
 859             if (get1bit())
 860               val -= y;
 861             part2remain--;
 862           }
 863           x = y >> 4;
 864           y &= 0xf;
 865         }
 866         if (x == 15) {
 867           max = cb;
 868           part2remain -= h->linbits+1;
 869           x += getbits(h->linbits);
 870           if(get1bit())
 871             *xrpnt++ = -ispow[x] * v;
 872           else
 873             *xrpnt++ =  ispow[x] * v;
 874         }
 875         else if(x) {
 876           max = cb;
 877           if(get1bit())
 878             *xrpnt++ = -ispow[x] * v;
 879           else
 880             *xrpnt++ =  ispow[x] * v;
 881           part2remain--;
 882         }
 883         else
 884           *xrpnt++ = 0.0;
 885
 886         if (y == 15) {
 887           max = cb;
 888           part2remain -= h->linbits+1;
 889           y += getbits(h->linbits);
 890           if(get1bit())
 891             *xrpnt++ = -ispow[y] * v;
 892           else
 893             *xrpnt++ =  ispow[y] * v;
 894         }
 895         else if(y) {
 896           max = cb;
 897           if(get1bit())
 898             *xrpnt++ = -ispow[y] * v;
 899           else
 900             *xrpnt++ =  ispow[y] * v;
 901           part2remain--;
 902         }
 903         else
 904           *xrpnt++ = 0.0;
 905       }
 906     }
 907
 908         /*
 909      * short (count1table) values
 910      */
 911     for(;l3 && (part2remain > 0);l3--) {
 912       struct newhuff *h = htc+gr_info->count1table_select;
 913       register short *val = h->table,a;
 914
 915       while((a=*val++)<0) {
 916         part2remain--;
 917         if(part2remain < 0) {
 918           part2remain++;
 919           a = 0;
 920           break;
 921         }
 922         if (get1bit())
 923           val -= a;
 924       }
 925
 926       for(i=0;i<4;i++) {
 927         if(!(i & 1)) {
 928           if(!mc) {
 929             mc = *m++;
 930             cb = *m++;
 931             v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift];
 932           }
 933           mc--;
 934         }
 935         if ( (a & (0x8>>i)) ) {
 936           max = cb;
 937           part2remain--;
 938           if(part2remain < 0) {
 939             part2remain++;
 940             break;
 941           }
 942           if(get1bit())
 943             *xrpnt++ = -v;
 944           else
 945             *xrpnt++ = v;
 946         }
 947         else
 948           *xrpnt++ = 0.0;
 949       }
 950     }
 951
 952         /*
 953      * zero part
 954      */
 955     for(i=(&xr[SBLIMIT][0]-xrpnt)>>1;i;i--) {
 956       *xrpnt++ = 0.0;
 957       *xrpnt++ = 0.0;
 958     }
 959
 960     gr_info->maxbandl = max+1;
 961     gr_info->maxb = longLimit[sfreq][gr_info->maxbandl];
 962   }
 963
 964   while( part2remain > 16 ) {
 965     getbits(16); /* Dismiss stuffing Bits */
 966     part2remain -= 16;
 967   }
 968   if(part2remain > 0)
 969     getbits(part2remain);
 970   else if(part2remain < 0) {
 971     fprintf(stderr,"mpg123: Can't rewind stream by %d bits!\n",-part2remain);
 972     return 1; /* -> error */
 973   }
 974   return 0;
 975 }
 976
 977 #if 0
 978 static int III_dequantize_sample_ms(real xr[2][SBLIMIT][SSLIMIT],int *scf,
 979    struct gr_info_s *gr_info,int sfreq,int part2bits)
 980 {
 981   int shift = 1 + gr_info->scalefac_scale;
 982   real *xrpnt = (real *) xr[1];
 983   real *xr0pnt = (real *) xr[0];
 984   int l[3],l3;
 985   int part2remain = gr_info->part2_3_length - part2bits;
 986   int *me;
 987
 988   {
 989     int bv       = gr_info->big_values;
 990     int region1  = gr_info->region1start;
 991     int region2  = gr_info->region2start;
 992
 993     l3 = ((576>>1)-bv)>>1;
 994 /*
 995  * we may lose the 'odd' bit here !!
 996  * check this later gain
 997  */
 998     if(bv <= region1) {
 999       l[0] = bv; l[1] = 0; l[2] = 0;
1000     }
1001     else {
1002       l[0] = region1;
1003       if(bv <= region2) {
1004         l[1] = bv - l[0];  l[2] = 0;
1005       }
1006       else {
1007         l[1] = region2 - l[0]; l[2] = bv - region2;
1008       }
1009     }
1010   }
1011
1012   if(gr_info->block_type == 2) {
1013     int i,max[4];
1014     int step=0,lwin=0,cb=0;
1015     register real v = 0.0;
1016     register int *m,mc = 0;
1017
1018     if(gr_info->mixed_block_flag) {
1019       max[3] = -1;
1020       max[0] = max[1] = max[2] = 2;
1021       m = map[sfreq][0];
1022       me = mapend[sfreq][0];
1023     }
1024     else {
1025       max[0] = max[1] = max[2] = max[3] = -1;
1026       /* max[3] not really needed in this case */
1027       m = map[sfreq][1];
1028       me = mapend[sfreq][1];
1029     }
1030
1031     for(i=0;i<2;i++) {
1032       int lp = l[i];
1033       struct newhuff *h = ht+gr_info->table_select[i];
1034       for(;lp;lp--,mc--) {
1035         int x,y;
1036
1037         if(!mc) {
1038           mc = *m++;
1039           xrpnt = ((real *) xr[1]) + *m;
1040           xr0pnt = ((real *) xr[0]) + *m++;
1041           lwin = *m++;
1042           cb = *m++;
1043           if(lwin == 3) {
1044             v = gr_info->pow2gain[(*scf++) << shift];
1045             step = 1;
1046           }
1047           else {
1048             v = gr_info->full_gain[lwin][(*scf++) << shift];
1049             step = 3;
1050           }
1051         }
1052         {
1053           register short *val = h->table;
1054           while((y=*val++)<0) {
1055             if (get1bit())
1056               val -= y;
1057             part2remain--;
1058           }
1059           x = y >> 4;
1060           y &= 0xf;
1061         }
1062         if(x == 15) {
1063           max[lwin] = cb;
1064           part2remain -= h->linbits+1;
1065           x += getbits(h->linbits);
1066           if(get1bit()) {
1067             real a = ispow[x] * v;
1068             *xrpnt = *xr0pnt + a;
1069             *xr0pnt -= a;
1070           }
1071           else {
1072             real a = ispow[x] * v;
1073             *xrpnt = *xr0pnt - a;
1074             *xr0pnt += a;
1075           }
1076         }
1077         else if(x) {
1078           max[lwin] = cb;
1079           if(get1bit()) {
1080             real a = ispow[x] * v;
1081             *xrpnt = *xr0pnt + a;
1082             *xr0pnt -= a;
1083           }
1084           else {
1085             real a = ispow[x] * v;
1086             *xrpnt = *xr0pnt - a;
1087             *xr0pnt += a;
1088           }
1089           part2remain--;
1090         }
1091         else
1092           *xrpnt = *xr0pnt;
1093         xrpnt += step;
1094         xr0pnt += step;
1095
1096         if(y == 15) {
1097           max[lwin] = cb;
1098           part2remain -= h->linbits+1;
1099           y += getbits(h->linbits);
1100           if(get1bit()) {
1101             real a = ispow[y] * v;
1102             *xrpnt = *xr0pnt + a;
1103             *xr0pnt -= a;
1104           }
1105           else {
1106             real a = ispow[y] * v;
1107             *xrpnt = *xr0pnt - a;
1108             *xr0pnt += a;
1109           }
1110         }
1111         else if(y) {
1112           max[lwin] = cb;
1113           if(get1bit()) {
1114             real a = ispow[y] * v;
1115             *xrpnt = *xr0pnt + a;
1116             *xr0pnt -= a;
1117           }
1118           else {
1119             real a = ispow[y] * v;
1120             *xrpnt = *xr0pnt - a;
1121             *xr0pnt += a;
1122           }
1123           part2remain--;
1124         }
1125         else
1126           *xrpnt = *xr0pnt;
1127         xrpnt += step;
1128         xr0pnt += step;
1129       }
1130     }
1131
1132     for(;l3 && (part2remain > 0);l3--) {
1133       struct newhuff *h = htc+gr_info->count1table_select;
1134       register short *val = h->table,a;
1135
1136       while((a=*val++)<0) {
1137         part2remain--;
1138         if(part2remain < 0) {
1139           part2remain++;
1140           a = 0;
1141           break;
1142         }
1143         if (get1bit())
1144           val -= a;
1145       }
1146
1147       for(i=0;i<4;i++) {
1148         if(!(i & 1)) {
1149           if(!mc) {
1150             mc = *m++;
1151             xrpnt = ((real *) xr[1]) + *m;
1152             xr0pnt = ((real *) xr[0]) + *m++;
1153             lwin = *m++;
1154             cb = *m++;
1155             if(lwin == 3) {
1156               v = gr_info->pow2gain[(*scf++) << shift];
1157               step = 1;
1158             }
1159             else {
1160               v = gr_info->full_gain[lwin][(*scf++) << shift];
1161               step = 3;
1162             }
1163           }
1164           mc--;
1165         }
1166         if( (a & (0x8>>i)) ) {
1167           max[lwin] = cb;
1168           part2remain--;
1169           if(part2remain < 0) {
1170             part2remain++;
1171             break;
1172           }
1173           if(get1bit()) {
1174             *xrpnt = *xr0pnt + v;
1175             *xr0pnt -= v;
1176           }
1177           else {
1178             *xrpnt = *xr0pnt - v;
1179             *xr0pnt += v;
1180           }
1181         }
1182         else
1183           *xrpnt = *xr0pnt;
1184         xrpnt += step;
1185         xr0pnt += step;
1186       }
1187     }
1188
1189     while( m < me ) {
1190       if(!mc) {
1191         mc = *m++;
1192         xrpnt = ((real *) xr[1]) + *m;
1193         xr0pnt = ((real *) xr[0]) + *m++;
1194         if(*m++ == 3)
1195           step = 1;
1196         else
1197           step = 3;
1198         m++; /* cb */
1199       }
1200       mc--;
1201       *xrpnt = *xr0pnt;
1202       xrpnt += step;
1203       xr0pnt += step;
1204       *xrpnt = *xr0pnt;
1205       xrpnt += step;
1206       xr0pnt += step;
1207 /* we could add a little opt. here:
1208  * if we finished a band for window 3 or a long band
1209  * further bands could copied in a simple loop without a
1210  * special 'map' decoding
1211  */
1212     }
1213
1214     gr_info->maxband[0] = max[0]+1;
1215     gr_info->maxband[1] = max[1]+1;
1216     gr_info->maxband[2] = max[2]+1;
1217     gr_info->maxbandl = max[3]+1;
1218
1219     {
1220       int rmax = max[0] > max[1] ? max[0] : max[1];
1221       rmax = (rmax > max[2] ? rmax : max[2]) + 1;
1222       gr_info->maxb = rmax ? shortLimit[sfreq][rmax] : longLimit[sfreq][max[3]+1];
1223     }
1224   }
1225   else {
1226     int *pretab = gr_info->preflag ? pretab1 : pretab2;
1227     int i,max = -1;
1228     int cb = 0;
1229     register int mc=0,*m = map[sfreq][2];
1230     register real v = 0.0;
1231 #if 0
1232     me = mapend[sfreq][2];
1233 #endif
1234
1235     for(i=0;i<3;i++) {
1236       int lp = l[i];
1237       struct newhuff *h = ht+gr_info->table_select[i];
1238
1239       for(;lp;lp--,mc--) {
1240         int x,y;
1241         if(!mc) {
1242           mc = *m++;
1243           cb = *m++;
1244           v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift];
1245         }
1246         {
1247           register short *val = h->table;
1248           while((y=*val++)<0) {
1249             if (get1bit())
1250               val -= y;
1251             part2remain--;
1252           }
1253           x = y >> 4;
1254           y &= 0xf;
1255         }
1256         if (x == 15) {
1257           max = cb;
1258           part2remain -= h->linbits+1;
1259           x += getbits(h->linbits);
1260           if(get1bit()) {
1261             real a = ispow[x] * v;
1262             *xrpnt++ = *xr0pnt + a;
1263             *xr0pnt++ -= a;
1264           }
1265           else {
1266             real a = ispow[x] * v;
1267             *xrpnt++ = *xr0pnt - a;
1268             *xr0pnt++ += a;
1269           }
1270         }
1271         else if(x) {
1272           max = cb;
1273           if(get1bit()) {
1274             real a = ispow[x] * v;
1275             *xrpnt++ = *xr0pnt + a;
1276             *xr0pnt++ -= a;
1277           }
1278           else {
1279             real a = ispow[x] * v;
1280             *xrpnt++ = *xr0pnt - a;
1281             *xr0pnt++ += a;
1282           }
1283           part2remain--;
1284         }
1285         else
1286           *xrpnt++ = *xr0pnt++;
1287
1288         if (y == 15) {
1289           max = cb;
1290           part2remain -= h->linbits+1;
1291           y += getbits(h->linbits);
1292           if(get1bit()) {
1293             real a = ispow[y] * v;
1294             *xrpnt++ = *xr0pnt + a;
1295             *xr0pnt++ -= a;
1296           }
1297           else {
1298             real a = ispow[y] * v;
1299             *xrpnt++ = *xr0pnt - a;
1300             *xr0pnt++ += a;
1301           }
1302         }
1303         else if(y) {
1304           max = cb;
1305           if(get1bit()) {
1306             real a = ispow[y] * v;
1307             *xrpnt++ = *xr0pnt + a;
1308             *xr0pnt++ -= a;
1309           }
1310           else {
1311             real a = ispow[y] * v;
1312             *xrpnt++ = *xr0pnt - a;
1313             *xr0pnt++ += a;
1314           }
1315           part2remain--;
1316         }
1317         else
1318           *xrpnt++ = *xr0pnt++;
1319       }
1320     }
1321
1322     for(;l3 && (part2remain > 0);l3--) {
1323       struct newhuff *h = htc+gr_info->count1table_select;
1324       register short *val = h->table,a;
1325
1326       while((a=*val++)<0) {
1327         part2remain--;
1328         if(part2remain < 0) {
1329           part2remain++;
1330           a = 0;
1331           break;
1332         }
1333         if (get1bit())
1334           val -= a;
1335       }
1336
1337       for(i=0;i<4;i++) {
1338         if(!(i & 1)) {
1339           if(!mc) {
1340             mc = *m++;
1341             cb = *m++;
1342             v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift];
1343           }
1344           mc--;
1345         }
1346         if ( (a & (0x8>>i)) ) {
1347           max = cb;
1348           part2remain--;
1349           if(part2remain <= 0) {
1350             part2remain++;
1351             break;
1352           }
1353           if(get1bit()) {
1354             *xrpnt++ = *xr0pnt + v;
1355             *xr0pnt++ -= v;
1356           }
1357           else {
1358             *xrpnt++ = *xr0pnt - v;
1359             *xr0pnt++ += v;
1360           }
1361         }
1362         else
1363           *xrpnt++ = *xr0pnt++;
1364       }
1365     }
1366     for(i=(&xr[1][SBLIMIT][0]-xrpnt)>>1;i;i--) {
1367       *xrpnt++ = *xr0pnt++;
1368       *xrpnt++ = *xr0pnt++;
1369     }
1370
1371     gr_info->maxbandl = max+1;
1372     gr_info->maxb = longLimit[sfreq][gr_info->maxbandl];
1373   }
1374
1375   while ( part2remain > 16 ) {
1376     getbits(16); /* Dismiss stuffing Bits */
1377     part2remain -= 16;
1378   }
1379   if(part2remain > 0 )
1380     getbits(part2remain);
1381   else if(part2remain < 0) {
1382     fprintf(stderr,"mpg123_ms: Can't rewind stream by %d bits!\n",-part2remain);
1383     return 1; /* -> error */
1384   }
1385   return 0;
1386 }
1387 #endif
1388
1389 /*
1390  * III_stereo: calculate real channel values for Joint-I-Stereo-mode
1391  */
1392 static void III_i_stereo(real xr_buf[2][SBLIMIT][SSLIMIT],int *scalefac,
1393    struct gr_info_s *gr_info,int sfreq,int ms_stereo,int lsf)
1394 {
1395       real (*xr)[SBLIMIT*SSLIMIT] = (real (*)[SBLIMIT*SSLIMIT] ) xr_buf;
1396       struct bandInfoStruct *bi = &bandInfo[sfreq];
1397       real *tab1,*tab2;
1398
1399       if(lsf) {
1400         int p = gr_info->scalefac_compress & 0x1;
1401             if(ms_stereo) {
1402           tab1 = pow1_2[p]; tab2 = pow2_2[p];
1403         }
1404         else {
1405           tab1 = pow1_1[p]; tab2 = pow2_1[p];
1406         }
1407       }
1408       else {
1409         if(ms_stereo) {
1410           tab1 = tan1_2; tab2 = tan2_2;
1411         }
1412         else {
1413           tab1 = tan1_1; tab2 = tan2_1;
1414         }
1415       }
1416
1417       if (gr_info->block_type == 2)
1418       {
1419          int lwin,do_l = 0;
1420          if( gr_info->mixed_block_flag )
1421            do_l = 1;
1422
1423          for (lwin=0;lwin<3;lwin++) /* process each window */
1424          {
1425              /* get first band with zero values */
1426            int is_p,sb,idx,sfb = gr_info->maxband[lwin];  /* sfb is minimal 3 for mixed mode */
1427            if(sfb > 3)
1428              do_l = 0;
1429
1430            for(;sfb<12;sfb++)
1431            {
1432              is_p = scalefac[sfb*3+lwin-gr_info->mixed_block_flag]; /* scale: 0-15 */
1433              if(is_p != 7) {
1434                real t1,t2;
1435                sb = bi->shortDiff[sfb];
1436                idx = bi->shortIdx[sfb] + lwin;
1437                t1 = tab1[is_p]; t2 = tab2[is_p];
1438                for (; sb > 0; sb--,idx+=3)
1439                {
1440                  real v = xr[0][idx];
1441                  xr[0][idx] = v * t1;
1442                  xr[1][idx] = v * t2;
1443                }
1444              }
1445            }
1446
1447 #if 1
1448 /* in the original: copy 10 to 11 , here: copy 11 to 12
1449 maybe still wrong??? (copy 12 to 13?) */
1450            is_p = scalefac[11*3+lwin-gr_info->mixed_block_flag]; /* scale: 0-15 */
1451            sb = bi->shortDiff[12];
1452            idx = bi->shortIdx[12] + lwin;
1453 #else
1454            is_p = scalefac[10*3+lwin-gr_info->mixed_block_flag]; /* scale: 0-15 */
1455            sb = bi->shortDiff[11];
1456            idx = bi->shortIdx[11] + lwin;
1457 #endif
1458            if(is_p != 7)
1459            {
1460              real t1,t2;
1461              t1 = tab1[is_p]; t2 = tab2[is_p];
1462              for ( ; sb > 0; sb--,idx+=3 )
1463              {
1464                real v = xr[0][idx];
1465                xr[0][idx] = v * t1;
1466                xr[1][idx] = v * t2;
1467              }
1468            }
1469          } /* end for(lwin; .. ; . ) */
1470
1471          if (do_l)
1472          {
1473 /* also check l-part, if ALL bands in the three windows are 'empty'
1474  * and mode = mixed_mode
1475  */
1476            int sfb = gr_info->maxbandl;
1477            int idx = bi->longIdx[sfb];
1478
1479            for ( ; sfb<8; sfb++ )
1480            {
1481              int sb = bi->longDiff[sfb];
1482              int is_p = scalefac[sfb]; /* scale: 0-15 */
1483              if(is_p != 7) {
1484                real t1,t2;
1485                t1 = tab1[is_p]; t2 = tab2[is_p];
1486                for ( ; sb > 0; sb--,idx++)
1487                {
1488                  real v = xr[0][idx];
1489                  xr[0][idx] = v * t1;
1490                  xr[1][idx] = v * t2;
1491                }
1492              }
1493              else
1494                idx += sb;
1495            }
1496          }
1497       }
1498       else /* ((gr_info->block_type != 2)) */
1499       {
1500         int sfb = gr_info->maxbandl;
1501         int is_p,idx = bi->longIdx[sfb];
1502         for ( ; sfb<21; sfb++)
1503         {
1504           int sb = bi->longDiff[sfb];
1505           is_p = scalefac[sfb]; /* scale: 0-15 */
1506           if(is_p != 7) {
1507             real t1,t2;
1508             t1 = tab1[is_p]; t2 = tab2[is_p];
1509             for ( ; sb > 0; sb--,idx++)
1510             {
1511                real v = xr[0][idx];
1512                xr[0][idx] = v * t1;
1513                xr[1][idx] = v * t2;
1514             }
1515           }
1516           else
1517             idx += sb;
1518         }
1519
1520         is_p = scalefac[20]; /* copy l-band 20 to l-band 21 */
1521         if(is_p != 7)
1522         {
1523           int sb;
1524           real t1 = tab1[is_p],t2 = tab2[is_p];
1525
1526           for ( sb = bi->longDiff[21]; sb > 0; sb--,idx++ )
1527           {
1528             real v = xr[0][idx];
1529             xr[0][idx] = v * t1;
1530             xr[1][idx] = v * t2;
1531           }
1532         }
1533       } /* ... */
1534 }
1535
1536 static void III_antialias(real xr[SBLIMIT][SSLIMIT],struct gr_info_s *gr_info)
1537 {
1538    int sblim;
1539
1540    if(gr_info->block_type == 2)
1541    {
1542       if(!gr_info->mixed_block_flag)
1543         return;
1544       sblim = 1;
1545    }
1546    else {
1547      sblim = gr_info->maxb-1;
1548    }
1549
1550    /* 31 alias-reduction operations between each pair of sub-bands */
1551    /* with 8 butterflies between each pair                         */
1552
1553    {
1554      int sb;
1555      real *xr1=(real *) xr[1];
1556
1557      for(sb=sblim;sb;sb--,xr1+=10)
1558      {
1559        int ss;
1560        real *cs=aa_cs,*ca=aa_ca;
1561        real *xr2 = xr1;
1562
1563        for(ss=7;ss>=0;ss--)
1564        {       /* upper and lower butterfly inputs */
1565          register real bu = *--xr2,bd = *xr1;
1566          *xr2   = (bu * (*cs)   ) - (bd * (*ca)   );
1567          *xr1++ = (bd * (*cs++) ) + (bu * (*ca++) );
1568        }
1569      }
1570   }
1571 }
1572
1573 /*
1574  DCT insipired by Jeff Tsay's DCT from the maplay package
1575  this is an optimized version with manual unroll.
1576
1577  References:
1578  [1] S. Winograd: "On Computing the Discrete Fourier Transform",
1579      Mathematics of Computation, Volume 32, Number 141, January 1978,
1580      Pages 175-199
1581 */
1582
1583 static void dct36(real *inbuf,real *o1,real *o2,real *wintab,real *tsbuf)
1584 {
1585   {
1586     register real *in = inbuf;
1587
1588     in[17]+=in[16]; in[16]+=in[15]; in[15]+=in[14];
1589     in[14]+=in[13]; in[13]+=in[12]; in[12]+=in[11];
1590     in[11]+=in[10]; in[10]+=in[9];  in[9] +=in[8];
1591     in[8] +=in[7];  in[7] +=in[6];  in[6] +=in[5];
1592     in[5] +=in[4];  in[4] +=in[3];  in[3] +=in[2];
1593     in[2] +=in[1];  in[1] +=in[0];
1594
1595     in[17]+=in[15]; in[15]+=in[13]; in[13]+=in[11]; in[11]+=in[9];
1596     in[9] +=in[7];  in[7] +=in[5];  in[5] +=in[3];  in[3] +=in[1];
1597
1598
1599   {
1600
1601 #define MACRO0(v) { \
1602     real tmp; \
1603     out2[9+(v)] = (tmp = sum0 + sum1) * w[27+(v)]; \
1604     out2[8-(v)] = tmp * w[26-(v)];  } \
1605     sum0 -= sum1; \
1606     ts[SBLIMIT*(8-(v))] = out1[8-(v)] + sum0 * w[8-(v)]; \
1607     ts[SBLIMIT*(9+(v))] = out1[9+(v)] + sum0 * w[9+(v)];
1608 #define MACRO1(v) { \
1609         real sum0,sum1; \
1610     sum0 = tmp1a + tmp2a; \
1611         sum1 = (tmp1b + tmp2b) * tfcos36[(v)]; \
1612         MACRO0(v); }
1613 #define MACRO2(v) { \
1614     real sum0,sum1; \
1615     sum0 = tmp2a - tmp1a; \
1616     sum1 = (tmp2b - tmp1b) * tfcos36[(v)]; \
1617         MACRO0(v); }
1618
1619     register const real *c = COS9;
1620     register real *out2 = o2;
1621         register real *w = wintab;
1622         register real *out1 = o1;
1623         register real *ts = tsbuf;
1624
1625     real ta33,ta66,tb33,tb66;
1626
1627     ta33 = in[2*3+0] * c[3];
1628     ta66 = in[2*6+0] * c[6];
1629     tb33 = in[2*3+1] * c[3];
1630     tb66 = in[2*6+1] * c[6];
1631
1632     {
1633       real tmp1a,tmp2a,tmp1b,tmp2b;
1634       tmp1a =             in[2*1+0] * c[1] + ta33 + in[2*5+0] * c[5] + in[2*7+0] * c[7];
1635       tmp1b =             in[2*1+1] * c[1] + tb33 + in[2*5+1] * c[5] + in[2*7+1] * c[7];
1636       tmp2a = in[2*0+0] + in[2*2+0] * c[2] + in[2*4+0] * c[4] + ta66 + in[2*8+0] * c[8];
1637       tmp2b = in[2*0+1] + in[2*2+1] * c[2] + in[2*4+1] * c[4] + tb66 + in[2*8+1] * c[8];
1638
1639       MACRO1(0);
1640       MACRO2(8);
1641     }
1642
1643     {
1644       real tmp1a,tmp2a,tmp1b,tmp2b;
1645       tmp1a = ( in[2*1+0] - in[2*5+0] - in[2*7+0] ) * c[3];
1646       tmp1b = ( in[2*1+1] - in[2*5+1] - in[2*7+1] ) * c[3];
1647       tmp2a = ( in[2*2+0] - in[2*4+0] - in[2*8+0] ) * c[6] - in[2*6+0] + in[2*0+0];
1648       tmp2b = ( in[2*2+1] - in[2*4+1] - in[2*8+1] ) * c[6] - in[2*6+1] + in[2*0+1];
1649
1650       MACRO1(1);
1651       MACRO2(7);
1652     }
1653
1654     {
1655       real tmp1a,tmp2a,tmp1b,tmp2b;
1656       tmp1a =             in[2*1+0] * c[5] - ta33 - in[2*5+0] * c[7] + in[2*7+0] * c[1];
1657       tmp1b =             in[2*1+1] * c[5] - tb33 - in[2*5+1] * c[7] + in[2*7+1] * c[1];
1658       tmp2a = in[2*0+0] - in[2*2+0] * c[8] - in[2*4+0] * c[2] + ta66 + in[2*8+0] * c[4];
1659       tmp2b = in[2*0+1] - in[2*2+1] * c[8] - in[2*4+1] * c[2] + tb66 + in[2*8+1] * c[4];
1660
1661       MACRO1(2);
1662       MACRO2(6);
1663     }
1664
1665     {
1666       real tmp1a,tmp2a,tmp1b,tmp2b;
1667       tmp1a =             in[2*1+0] * c[7] - ta33 + in[2*5+0] * c[1] - in[2*7+0] * c[5];
1668       tmp1b =             in[2*1+1] * c[7] - tb33 + in[2*5+1] * c[1] - in[2*7+1] * c[5];
1669       tmp2a = in[2*0+0] - in[2*2+0] * c[4] + in[2*4+0] * c[8] + ta66 - in[2*8+0] * c[2];
1670       tmp2b = in[2*0+1] - in[2*2+1] * c[4] + in[2*4+1] * c[8] + tb66 - in[2*8+1] * c[2];
1671
1672       MACRO1(3);
1673       MACRO2(5);
1674     }
1675
1676         {
1677                 real sum0,sum1;
1678         sum0 =  in[2*0+0] - in[2*2+0] + in[2*4+0] - in[2*6+0] + in[2*8+0];
1679         sum1 = (in[2*0+1] - in[2*2+1] + in[2*4+1] - in[2*6+1] + in[2*8+1] ) * tfcos36[4];
1680                 MACRO0(4);
1681         }
1682   }
1683
1684   }
1685 }
1686
1687 /*
1688  * new DCT12
1689  */
1690 static void dct12(real *in,real *rawout1,real *rawout2,register real *wi,register real *ts)
1691 {
1692 #define DCT12_PART1 \
1693              in5 = in[5*3];  \
1694      in5 += (in4 = in[4*3]); \
1695      in4 += (in3 = in[3*3]); \
1696      in3 += (in2 = in[2*3]); \
1697      in2 += (in1 = in[1*3]); \
1698      in1 += (in0 = in[0*3]); \
1699                              \
1700      in5 += in3; in3 += in1; \
1701                              \
1702      in2 *= COS6_1; \
1703      in3 *= COS6_1; \
1704
1705 #define DCT12_PART2 \
1706      in0 += in4 * COS6_2; \
1707                           \
1708      in4 = in0 + in2;     \
1709      in0 -= in2;          \
1710                           \
1711      in1 += in5 * COS6_2; \
1712                           \
1713      in5 = (in1 + in3) * tfcos12[0]; \
1714      in1 = (in1 - in3) * tfcos12[2]; \
1715                          \
1716      in3 = in4 + in5;    \
1717      in4 -= in5;         \
1718                          \
1719      in2 = in0 + in1;    \
1720      in0 -= in1;
1721
1722
1723    {
1724      real in0,in1,in2,in3,in4,in5;
1725      register real *out1 = rawout1;
1726      ts[SBLIMIT*0] = out1[0]; ts[SBLIMIT*1] = out1[1]; ts[SBLIMIT*2] = out1[2];
1727      ts[SBLIMIT*3] = out1[3]; ts[SBLIMIT*4] = out1[4]; ts[SBLIMIT*5] = out1[5];
1728
1729      DCT12_PART1
1730
1731      {
1732        real tmp0,tmp1 = (in0 - in4);
1733        {
1734          real tmp2 = (in1 - in5) * tfcos12[1];
1735          tmp0 = tmp1 + tmp2;
1736          tmp1 -= tmp2;
1737        }
1738        ts[(17-1)*SBLIMIT] = out1[17-1] + tmp0 * wi[11-1];
1739        ts[(12+1)*SBLIMIT] = out1[12+1] + tmp0 * wi[6+1];
1740        ts[(6 +1)*SBLIMIT] = out1[6 +1] + tmp1 * wi[1];
1741        ts[(11-1)*SBLIMIT] = out1[11-1] + tmp1 * wi[5-1];
1742      }
1743
1744      DCT12_PART2
1745
1746      ts[(17-0)*SBLIMIT] = out1[17-0] + in2 * wi[11-0];
1747      ts[(12+0)*SBLIMIT] = out1[12+0] + in2 * wi[6+0];
1748      ts[(12+2)*SBLIMIT] = out1[12+2] + in3 * wi[6+2];
1749      ts[(17-2)*SBLIMIT] = out1[17-2] + in3 * wi[11-2];
1750
1751      ts[(6+0)*SBLIMIT]  = out1[6+0] + in0 * wi[0];
1752      ts[(11-0)*SBLIMIT] = out1[11-0] + in0 * wi[5-0];
1753      ts[(6+2)*SBLIMIT]  = out1[6+2] + in4 * wi[2];
1754      ts[(11-2)*SBLIMIT] = out1[11-2] + in4 * wi[5-2];
1755   }
1756
1757   in++;
1758
1759   {
1760      real in0,in1,in2,in3,in4,in5;
1761      register real *out2 = rawout2;
1762
1763      DCT12_PART1
1764
1765      {
1766        real tmp0,tmp1 = (in0 - in4);
1767        {
1768          real tmp2 = (in1 - in5) * tfcos12[1];
1769          tmp0 = tmp1 + tmp2;
1770          tmp1 -= tmp2;
1771        }
1772        out2[5-1] = tmp0 * wi[11-1];
1773        out2[0+1] = tmp0 * wi[6+1];
1774        ts[(12+1)*SBLIMIT] += tmp1 * wi[1];
1775        ts[(17-1)*SBLIMIT] += tmp1 * wi[5-1];
1776      }
1777
1778      DCT12_PART2
1779
1780      out2[5-0] = in2 * wi[11-0];
1781      out2[0+0] = in2 * wi[6+0];
1782      out2[0+2] = in3 * wi[6+2];
1783      out2[5-2] = in3 * wi[11-2];
1784
1785      ts[(12+0)*SBLIMIT] += in0 * wi[0];
1786      ts[(17-0)*SBLIMIT] += in0 * wi[5-0];
1787      ts[(12+2)*SBLIMIT] += in4 * wi[2];
1788      ts[(17-2)*SBLIMIT] += in4 * wi[5-2];
1789   }
1790
1791   in++;
1792
1793   {
1794      real in0,in1,in2,in3,in4,in5;
1795      register real *out2 = rawout2;
1796      out2[12]=out2[13]=out2[14]=out2[15]=out2[16]=out2[17]=0.0;
1797
1798      DCT12_PART1
1799
1800      {
1801        real tmp0,tmp1 = (in0 - in4);
1802        {
1803          real tmp2 = (in1 - in5) * tfcos12[1];
1804          tmp0 = tmp1 + tmp2;
1805          tmp1 -= tmp2;
1806        }
1807        out2[11-1] = tmp0 * wi[11-1];
1808        out2[6 +1] = tmp0 * wi[6+1];
1809        out2[0+1] += tmp1 * wi[1];
1810        out2[5-1] += tmp1 * wi[5-1];
1811      }
1812
1813      DCT12_PART2
1814
1815      out2[11-0] = in2 * wi[11-0];
1816      out2[6 +0] = in2 * wi[6+0];
1817      out2[6 +2] = in3 * wi[6+2];
1818      out2[11-2] = in3 * wi[11-2];
1819
1820      out2[0+0] += in0 * wi[0];
1821      out2[5-0] += in0 * wi[5-0];
1822      out2[0+2] += in4 * wi[2];
1823      out2[5-2] += in4 * wi[5-2];
1824   }
1825 }
1826
1827 /*
1828  * III_hybrid
1829  */
1830 static void III_hybrid(real fsIn[SBLIMIT][SSLIMIT],real tsOut[SSLIMIT][SBLIMIT],
1831    int ch,struct gr_info_s *gr_info)
1832 {
1833    real *tspnt = (real *) tsOut;
1834    real (*block)[2][SBLIMIT*SSLIMIT] = gmp->hybrid_block;
1835    int *blc = gmp->hybrid_blc;
1836    real *rawout1,*rawout2;
1837    int bt;
1838    int sb = 0;
1839
1840    {
1841      int b = blc[ch];
1842      rawout1=block[b][ch];
1843      b=-b+1;
1844      rawout2=block[b][ch];
1845      blc[ch] = b;
1846    }
1847
1848
1849    if(gr_info->mixed_block_flag) {
1850      sb = 2;
1851      dct36(fsIn[0],rawout1,rawout2,win[0],tspnt);
1852      dct36(fsIn[1],rawout1+18,rawout2+18,win1[0],tspnt+1);
1853      rawout1 += 36; rawout2 += 36; tspnt += 2;
1854    }
1855
1856    bt = gr_info->block_type;
1857    if(bt == 2) {
1858      for (; sb<gr_info->maxb; sb+=2,tspnt+=2,rawout1+=36,rawout2+=36) {
1859        dct12(fsIn[sb],rawout1,rawout2,win[2],tspnt);
1860        dct12(fsIn[sb+1],rawout1+18,rawout2+18,win1[2],tspnt+1);
1861      }
1862    }
1863    else {
1864      for (; sb<gr_info->maxb; sb+=2,tspnt+=2,rawout1+=36,rawout2+=36) {
1865        dct36(fsIn[sb],rawout1,rawout2,win[bt],tspnt);
1866        dct36(fsIn[sb+1],rawout1+18,rawout2+18,win1[bt],tspnt+1);
1867      }
1868    }
1869
1870    for(;sb<SBLIMIT;sb++,tspnt++) {
1871      int i;
1872      for(i=0;i<SSLIMIT;i++) {
1873        tspnt[i*SBLIMIT] = *rawout1++;
1874        *rawout2++ = 0.0;
1875      }
1876    }
1877 }
1878
1879 /*
1880  * main layer3 handler
1881  */
1882 int do_layer3(struct frame *fr,unsigned char *pcm_sample,int *pcm_point)
1883 {
1884   int gr, ch, ss,clip=0;
1885   int scalefacs[2][39]; /* max 39 for short[13][3] mode, mixed: 38, long: 22 */
1886   struct III_sideinfo sideinfo;
1887   int stereo = fr->stereo;
1888   int single = fr->single;
1889   int ms_stereo,i_stereo;
1890   int sfreq = fr->sampling_frequency;
1891   int stereo1,granules;
1892
1893   if(stereo == 1) { /* stream is mono */
1894     stereo1 = 1;
1895     single = 0;
1896   }
1897   else if(single >= 0) /* stream is stereo, but force to mono */
1898     stereo1 = 1;
1899   else
1900     stereo1 = 2;
1901
1902   if(fr->mode == MPG_MD_JOINT_STEREO) {
1903     ms_stereo = fr->mode_ext & 0x2;
1904     i_stereo  = fr->mode_ext & 0x1;
1905   }
1906   else
1907     ms_stereo = i_stereo = 0;
1908
1909   if(fr->lsf) {
1910     granules = 1;
1911     if(!III_get_side_info_2(&sideinfo,stereo,ms_stereo,sfreq,single))
1912       return -1;
1913   }
1914   else {
1915     granules = 2;
1916 #ifdef MPEG1
1917     if(!III_get_side_info_1(&sideinfo,stereo,ms_stereo,sfreq,single))
1918       return -1;
1919 #else
1920     fprintf(stderr,"Not supported\n");
1921 #endif
1922   }
1923
1924   if(set_pointer(sideinfo.main_data_begin) == MP3_ERR)
1925     return -1;
1926
1927   for (gr=0;gr<granules;gr++)
1928   {
1929     real hybridIn[2][SBLIMIT][SSLIMIT];
1930     real hybridOut[2][SSLIMIT][SBLIMIT];
1931
1932     {
1933       struct gr_info_s *gr_info = &(sideinfo.ch[0].gr[gr]);
1934       long part2bits;
1935       if(fr->lsf)
1936         part2bits = III_get_scale_factors_2(scalefacs[0],gr_info,0);
1937       else {
1938 #ifdef MPEG1
1939         part2bits = III_get_scale_factors_1(scalefacs[0],gr_info);
1940 #else
1941         fprintf(stderr,"Not supported\n");
1942 #endif
1943       }
1944       if(III_dequantize_sample(hybridIn[0], scalefacs[0],gr_info,sfreq,part2bits))
1945         return clip;
1946     }
1947     if(stereo == 2) {
1948       struct gr_info_s *gr_info = &(sideinfo.ch[1].gr[gr]);
1949       long part2bits;
1950       if(fr->lsf)
1951         part2bits = III_get_scale_factors_2(scalefacs[1],gr_info,i_stereo);
1952       else {
1953 #ifdef MPEG1
1954         part2bits = III_get_scale_factors_1(scalefacs[1],gr_info);
1955 #else
1956         fprintf(stderr,"Not supported\n");
1957 #endif
1958       }
1959
1960       if(III_dequantize_sample(hybridIn[1],scalefacs[1],gr_info,sfreq,part2bits))
1961           return clip;
1962
1963       if(ms_stereo) {
1964         int i;
1965         for(i=0;i<SBLIMIT*SSLIMIT;i++) {
1966           real tmp0,tmp1;
1967           tmp0 = ((real *) hybridIn[0])[i];
1968           tmp1 = ((real *) hybridIn[1])[i];
1969           ((real *) hybridIn[0])[i] = tmp0 + tmp1;
1970           ((real *) hybridIn[1])[i] = tmp0 - tmp1;
1971         }
1972       }
1973
1974       if(i_stereo)
1975         III_i_stereo(hybridIn,scalefacs[1],gr_info,sfreq,ms_stereo,fr->lsf);
1976
1977       if(ms_stereo || i_stereo || (single == 3) ) {
1978         if(gr_info->maxb > sideinfo.ch[0].gr[gr].maxb)
1979           sideinfo.ch[0].gr[gr].maxb = gr_info->maxb;
1980         else
1981           gr_info->maxb = sideinfo.ch[0].gr[gr].maxb;
1982       }
1983
1984       switch(single) {
1985         case 3:
1986           {
1987             register int i;
1988             register real *in0 = (real *) hybridIn[0],*in1 = (real *) hybridIn[1];
1989             for(i=0;i<SSLIMIT*gr_info->maxb;i++,in0++)
1990               *in0 = (*in0 + *in1++); /* *0.5 done by pow-scale */
1991           }
1992           break;
1993         case 1:
1994           {
1995             register int i;
1996             register real *in0 = (real *) hybridIn[0],*in1 = (real *) hybridIn[1];
1997             for(i=0;i<SSLIMIT*gr_info->maxb;i++)
1998               *in0++ = *in1++;
1999           }
2000           break;
2001       }
2002     }
2003
2004     for(ch=0;ch<stereo1;ch++) {
2005       struct gr_info_s *gr_info = &(sideinfo.ch[ch].gr[gr]);
2006       III_antialias(hybridIn[ch],gr_info);
2007       III_hybrid(hybridIn[ch], hybridOut[ch], ch,gr_info);
2008     }
2009
2010     for(ss=0;ss<SSLIMIT;ss++) {
2011       if(single >= 0) {
2012         clip += synth_1to1_mono(hybridOut[0][ss],pcm_sample,pcm_point);
2013       }
2014       else {
2015         int p1 = *pcm_point;
2016         clip += synth_1to1(hybridOut[0][ss],0,pcm_sample,&p1);
2017         clip += synth_1to1(hybridOut[1][ss],1,pcm_sample,pcm_point);
2018       }
2019     }
2020   }
2021
2022   return clip;
2023 }