mp3lib/layer3.c

   1 /*
   2  * Modified for use with MPlayer, for details see the changelog at
   3  * http://svn.mplayerhq.hu/mplayer/trunk/
   4  * $Id$
   5  */
   6
   7 /*
   8  * Mpeg Layer-3 audio decoder
   9  * --------------------------
  10  * copyright (c) 1995-1999 by Michael Hipp.
  11  * All rights reserved. See also 'README'
  12  *
  13  * Optimize-TODO: put short bands into the band-field without the stride
  14  *                of 3 reals
  15  * Length-optimze: unify long and short band code where it is possible
  16  */
  17
  18 #if 0
  19 #define L3_DEBUG 1
  20 #endif
  21
  22 #if 0
  23 #define CUT_HF
  24 #endif
  25
  26 # define REAL_MUL(x, y)         ((x) * (y))
  27
  28 static real ispow[8207];
  29 static real aa_ca[8],aa_cs[8];
  30 static real COS1[12][6];
  31 static real win[4][36];
  32 static real win1[4][36];
  33 static real gainpow2[256+118+4];
  34
  35 /* non static for external 3dnow functions */
  36 real   COS9[9];
  37 static real COS6_1,COS6_2;
  38 real   tfcos36[9];
  39
  40 static real tfcos12[3];
  41 #define NEW_DCT9
  42 #ifdef NEW_DCT9
  43 static real cos9[3],cos18[3];
  44 #endif
  45
  46 struct bandInfoStruct {
  47   uint16_t longIdx[23];
  48   uint8_t  longDiff[22];
  49   uint16_t shortIdx[14];
  50   uint8_t  shortDiff[13];
  51 };
  52
  53 static int longLimit[9][23];
  54 static int shortLimit[9][14];
  55
  56 static const struct bandInfoStruct bandInfo[9] = {
  57
  58 /* MPEG 1.0 */
  59  { {0,4,8,12,16,20,24,30,36,44,52,62,74, 90,110,134,162,196,238,288,342,418,576},
  60    {4,4,4,4,4,4,6,6,8, 8,10,12,16,20,24,28,34,42,50,54, 76,158},
  61    {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},
  62    {4,4,4,4,6,8,10,12,14,18,22,30,56} } ,
  63
  64  { {0,4,8,12,16,20,24,30,36,42,50,60,72, 88,106,128,156,190,230,276,330,384,576},
  65    {4,4,4,4,4,4,6,6,6, 8,10,12,16,18,22,28,34,40,46,54, 54,192},
  66    {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},
  67    {4,4,4,4,6,6,10,12,14,16,20,26,66} } ,
  68
  69  { {0,4,8,12,16,20,24,30,36,44,54,66,82,102,126,156,194,240,296,364,448,550,576} ,
  70    {4,4,4,4,4,4,6,6,8,10,12,16,20,24,30,38,46,56,68,84,102, 26} ,
  71    {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} ,
  72    {4,4,4,4,6,8,12,16,20,26,34,42,12} }  ,
  73
  74 /* MPEG 2.0 */
  75  { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576},
  76    {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54 } ,
  77    {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} ,
  78    {4,4,4,6,6,8,10,14,18,26,32,42,18 } } ,
  79 /* changed 19th value fropm 330 to 332 */
  80  { {0,6,12,18,24,30,36,44,54,66,80,96,114,136,162,194,232,278,332,394,464,540,576},
  81    {6,6,6,6,6,6,8,10,12,14,16,18,22,26,32,38,46,54,62,70,76,36 } ,
  82    {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} ,
  83    {4,4,4,6,8,10,12,14,18,24,32,44,12 } } ,
  84
  85  { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576},
  86    {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54 },
  87    {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},
  88    {4,4,4,6,8,10,12,14,18,24,30,40,18 } } ,
  89 /* MPEG 2.5 */
  90  { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576} ,
  91    {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54},
  92    {0,12,24,36,54,78,108,144,186,240,312,402,522,576},
  93    {4,4,4,6,8,10,12,14,18,24,30,40,18} },
  94  { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576} ,
  95    {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54},
  96    {0,12,24,36,54,78,108,144,186,240,312,402,522,576},
  97    {4,4,4,6,8,10,12,14,18,24,30,40,18} },
  98  { {0,12,24,36,48,60,72,88,108,132,160,192,232,280,336,400,476,566,568,570,572,574,576},
  99    {12,12,12,12,12,12,16,20,24,28,32,40,48,56,64,76,90,2,2,2,2,2},
 100    {0, 24, 48, 72,108,156,216,288,372,480,486,492,498,576},
 101    {8,8,8,12,16,20,24,28,36,2,2,2,26} } ,
 102 };
 103
 104 static int mapbuf0[9][152];
 105 static int mapbuf1[9][156];
 106 static int mapbuf2[9][44];
 107 static int *map[9][3];
 108 static int *mapend[9][3];
 109
 110 static unsigned int n_slen2[512]; /* MPEG 2.0 slen for 'normal' mode */
 111 static unsigned int i_slen2[256]; /* MPEG 2.0 slen for intensity stereo */
 112
 113 static real tan1_1[16],tan2_1[16],tan1_2[16],tan2_2[16];
 114 static real pow1_1[2][16],pow2_1[2][16],pow1_2[2][16],pow2_2[2][16];
 115
 116 /*
 117  * init tables for layer-3
 118  */
 119 static void init_layer3(int down_sample_sblimit)
 120 {
 121   int i,j,k,l;
 122
 123   for(i=-256;i<118+4;i++)
 124   {
 125     if(_has_mmx)
 126       gainpow2[i+256] = 16384.0 * pow((double)2.0,-0.25 * (double) (i+210) );
 127     else
 128       gainpow2[i+256] = pow((double)2.0,-0.25 * (double) (i+210) );
 129   }
 130   for(i=0;i<8207;i++)
 131     ispow[i] = pow((double)i,(double)4.0/3.0);
 132
 133   for (i=0;i<8;i++)
 134   {
 135     static const double Ci[8]={-0.6,-0.535,-0.33,-0.185,-0.095,-0.041,-0.0142,-0.0037};
 136     double sq=sqrt(1.0+Ci[i]*Ci[i]);
 137     aa_cs[i] = 1.0/sq;
 138     aa_ca[i] = Ci[i]/sq;
 139   }
 140
 141   for(i=0;i<18;i++)
 142   {
 143     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 );
 144     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 );
 145   }
 146   for(i=0;i<6;i++)
 147   {
 148     win[1][i+18] = 0.5 / cos ( M_PI * (double) (2*(i+18)+19) / 72.0 );
 149     win[3][i+12] = 0.5 / cos ( M_PI * (double) (2*(i+12)+19) / 72.0 );
 150     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 );
 151     win[1][i+30] = win[3][i] = 0.0;
 152     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 );
 153   }
 154
 155   for(i=0;i<9;i++)
 156     COS9[i] = cos( M_PI / 18.0 * (double) i);
 157
 158   for(i=0;i<9;i++)
 159     tfcos36[i] = 0.5 / cos ( M_PI * (double) (i*2+1) / 36.0 );
 160   for(i=0;i<3;i++)
 161     tfcos12[i] = 0.5 / cos ( M_PI * (double) (i*2+1) / 12.0 );
 162
 163   COS6_1 = cos( M_PI / 6.0 * (double) 1);
 164   COS6_2 = cos( M_PI / 6.0 * (double) 2);
 165
 166 #ifdef NEW_DCT9
 167   cos9[0] = cos(1.0*M_PI/9.0);
 168   cos9[1] = cos(5.0*M_PI/9.0);
 169   cos9[2] = cos(7.0*M_PI/9.0);
 170   cos18[0] = cos(1.0*M_PI/18.0);
 171   cos18[1] = cos(11.0*M_PI/18.0);
 172   cos18[2] = cos(13.0*M_PI/18.0);
 173 #endif
 174
 175   for(i=0;i<12;i++)
 176   {
 177     win[2][i]  = 0.5 * sin( M_PI / 24.0 * (double) (2*i+1) ) / cos ( M_PI * (double) (2*i+7) / 24.0 );
 178     for(j=0;j<6;j++)
 179       COS1[i][j] = cos( M_PI / 24.0 * (double) ((2*i+7)*(2*j+1)) );
 180   }
 181
 182   for(j=0;j<4;j++) {
 183     static const int len[4] = { 36,36,12,36 };
 184     for(i=0;i<len[j];i+=2)
 185       win1[j][i] = + win[j][i];
 186     for(i=1;i<len[j];i+=2)
 187       win1[j][i] = - win[j][i];
 188   }
 189
 190   for(i=0;i<16;i++)
 191   {
 192     double t = tan( (double) i * M_PI / 12.0 );
 193     tan1_1[i] = t / (1.0+t);
 194     tan2_1[i] = 1.0 / (1.0 + t);
 195     tan1_2[i] = M_SQRT2 * t / (1.0+t);
 196     tan2_2[i] = M_SQRT2 / (1.0 + t);
 197
 198     for(j=0;j<2;j++) {
 199       double base = pow(2.0,-0.25*(j+1.0));
 200       double p1=1.0,p2=1.0;
 201       if(i > 0) {
 202         if( i & 1 )
 203           p1 = pow(base,(i+1.0)*0.5);
 204         else
 205           p2 = pow(base,i*0.5);
 206       }
 207       pow1_1[j][i] = p1;
 208       pow2_1[j][i] = p2;
 209       pow1_2[j][i] = M_SQRT2 * p1;
 210       pow2_2[j][i] = M_SQRT2 * p2;
 211     }
 212   }
 213
 214   for(j=0;j<9;j++)
 215   {
 216    const struct bandInfoStruct *bi = &bandInfo[j];
 217    int *mp;
 218    int cb,lwin;
 219    const uint8_t *bdf;
 220
 221    mp = map[j][0] = mapbuf0[j];
 222    bdf = bi->longDiff;
 223    for(i=0,cb = 0; cb < 8 ; cb++,i+=*bdf++) {
 224      *mp++ = (*bdf) >> 1;
 225      *mp++ = i;
 226      *mp++ = 3;
 227      *mp++ = cb;
 228    }
 229    bdf = bi->shortDiff+3;
 230    for(cb=3;cb<13;cb++) {
 231      int l = (*bdf++) >> 1;
 232      for(lwin=0;lwin<3;lwin++) {
 233        *mp++ = l;
 234        *mp++ = i + lwin;
 235        *mp++ = lwin;
 236        *mp++ = cb;
 237      }
 238      i += 6*l;
 239    }
 240    mapend[j][0] = mp;
 241
 242    mp = map[j][1] = mapbuf1[j];
 243    bdf = bi->shortDiff+0;
 244    for(i=0,cb=0;cb<13;cb++) {
 245      int l = (*bdf++) >> 1;
 246      for(lwin=0;lwin<3;lwin++) {
 247        *mp++ = l;
 248        *mp++ = i + lwin;
 249        *mp++ = lwin;
 250        *mp++ = cb;
 251      }
 252      i += 6*l;
 253    }
 254    mapend[j][1] = mp;
 255
 256    mp = map[j][2] = mapbuf2[j];
 257    bdf = bi->longDiff;
 258    for(cb = 0; cb < 22 ; cb++) {
 259      *mp++ = (*bdf++) >> 1;
 260      *mp++ = cb;
 261    }
 262    mapend[j][2] = mp;
 263
 264   }
 265
 266   for(j=0;j<9;j++) {
 267     for(i=0;i<23;i++) {
 268       longLimit[j][i] = (bandInfo[j].longIdx[i] - 1 + 8) / 18 + 1;
 269       if(longLimit[j][i] > (down_sample_sblimit) )
 270         longLimit[j][i] = down_sample_sblimit;
 271     }
 272     for(i=0;i<14;i++) {
 273       shortLimit[j][i] = (bandInfo[j].shortIdx[i] - 1) / 18 + 1;
 274       if(shortLimit[j][i] > (down_sample_sblimit) )
 275         shortLimit[j][i] = down_sample_sblimit;
 276     }
 277   }
 278
 279   for(i=0;i<5;i++) {
 280     for(j=0;j<6;j++) {
 281       for(k=0;k<6;k++) {
 282         int n = k + j * 6 + i * 36;
 283         i_slen2[n] = i|(j<<3)|(k<<6)|(3<<12);
 284       }
 285     }
 286   }
 287   for(i=0;i<4;i++) {
 288     for(j=0;j<4;j++) {
 289       for(k=0;k<4;k++) {
 290         int n = k + j * 4 + i * 16;
 291         i_slen2[n+180] = i|(j<<3)|(k<<6)|(4<<12);
 292       }
 293     }
 294   }
 295   for(i=0;i<4;i++) {
 296     for(j=0;j<3;j++) {
 297       int n = j + i * 3;
 298       i_slen2[n+244] = i|(j<<3) | (5<<12);
 299       n_slen2[n+500] = i|(j<<3) | (2<<12) | (1<<15);
 300     }
 301   }
 302
 303   for(i=0;i<5;i++) {
 304     for(j=0;j<5;j++) {
 305       for(k=0;k<4;k++) {
 306         for(l=0;l<4;l++) {
 307           int n = l + k * 4 + j * 16 + i * 80;
 308           n_slen2[n] = i|(j<<3)|(k<<6)|(l<<9)|(0<<12);
 309         }
 310       }
 311     }
 312   }
 313   for(i=0;i<5;i++) {
 314     for(j=0;j<5;j++) {
 315       for(k=0;k<4;k++) {
 316         int n = k + j * 4 + i * 20;
 317         n_slen2[n+400] = i|(j<<3)|(k<<6)|(1<<12);
 318       }
 319     }
 320   }
 321 }
 322
 323 /*
 324  * read additional side information (for MPEG 1 and MPEG 2)
 325  */
 326 static int III_get_side_info(struct III_sideinfo *si,int stereo,
 327  int ms_stereo,int sfreq,int single,int lsf)
 328 {
 329    int ch, gr;
 330    int powdiff = (single == 3) ? 4 : 0;
 331
 332    static const int tabs[2][5] = { { 2,9,5,3,4 } , { 1,8,1,2,9 } };
 333    const int *tab = tabs[lsf];
 334
 335    si->main_data_begin = getbits(tab[1]);
 336    if (stereo == 1)
 337      si->private_bits = getbits_fast(tab[2]);
 338    else
 339      si->private_bits = getbits_fast(tab[3]);
 340
 341    if(!lsf) {
 342      for (ch=0; ch<stereo; ch++) {
 343          si->ch[ch].gr[0].scfsi = -1;
 344          si->ch[ch].gr[1].scfsi = getbits_fast(4);
 345      }
 346    }
 347
 348    for (gr=0; gr<tab[0]; gr++) {
 349      for (ch=0; ch<stereo; ch++) {
 350        register struct gr_info_s *gr_info = &(si->ch[ch].gr[gr]);
 351
 352        gr_info->part2_3_length = getbits(12);
 353        gr_info->big_values = getbits(9);
 354        if(gr_info->big_values > 288) {
 355             fprintf(stderr,"big_values too large!\n");
 356           gr_info->big_values = 288;
 357        }
 358        gr_info->pow2gain = gainpow2+256 - getbits_fast(8) + powdiff;
 359        if(ms_stereo)
 360          gr_info->pow2gain += 2;
 361        gr_info->scalefac_compress = getbits(tab[4]);
 362
 363        if(get1bit()) { /* window switch flag  */
 364          int i;
 365 #ifdef L3_DEBUG
 366 if(2*gr_info->big_values > bandInfo[sfreq].shortIdx[12])
 367   fprintf(stderr,"L3: BigValues too large, doesn't make sense %d %d\n",2*gr_info->big_values,bandInfo[sfreq].shortIdx[12]);
 368 #endif
 369
 370          gr_info->block_type       = getbits_fast(2);
 371          gr_info->mixed_block_flag = get1bit();
 372          gr_info->table_select[0]  = getbits_fast(5);
 373          gr_info->table_select[1]  = getbits_fast(5);
 374          /*
 375           * table_select[2] not needed, because there is no region2,
 376           * but to satisfy some verifications tools we set it either.
 377           */
 378          gr_info->table_select[2] = 0;
 379          for(i=0;i<3;i++)
 380            gr_info->full_gain[i] = gr_info->pow2gain + (getbits_fast(3)<<3);
 381
 382          if(gr_info->block_type == 0) {
 383              fprintf(stderr,"Blocktype == 0 and window-switching == 1 not allowed.\n");
 384            return 0;
 385          }
 386
 387          /* region_count/start parameters are implicit in this case. */
 388          if(!lsf || gr_info->block_type == 2)
 389            gr_info->region1start = 36>>1;
 390          else {
 391 /* check this again for 2.5 and sfreq=8 */
 392            if(sfreq == 8)
 393              gr_info->region1start = 108>>1;
 394            else
 395              gr_info->region1start = 54>>1;
 396          }
 397          gr_info->region2start = 576>>1;
 398        }
 399        else {
 400          int i,r0c,r1c;
 401 #ifdef L3_DEBUG
 402 if(2*gr_info->big_values > bandInfo[sfreq].longIdx[21])
 403   fprintf(stderr,"L3: BigValues too large, doesn't make sense %d %d\n",2*gr_info->big_values,bandInfo[sfreq].longIdx[21]);
 404 #endif
 405          for (i=0; i<3; i++)
 406            gr_info->table_select[i] = getbits_fast(5);
 407          r0c = getbits_fast(4);
 408          r1c = getbits_fast(3);
 409          gr_info->region1start = bandInfo[sfreq].longIdx[r0c+1] >> 1 ;
 410          if(r0c + r1c + 2 > 22)
 411            gr_info->region2start = 576>>1;
 412          else
 413            gr_info->region2start = bandInfo[sfreq].longIdx[r0c+1+r1c+1] >> 1;
 414          gr_info->block_type = 0;
 415          gr_info->mixed_block_flag = 0;
 416        }
 417        if(!lsf)
 418          gr_info->preflag = get1bit();
 419        gr_info->scalefac_scale = get1bit();
 420        gr_info->count1table_select = get1bit();
 421      }
 422    }
 423
 424    return !0;
 425 }
 426
 427 /*
 428  * read scalefactors
 429  */
 430 static int III_get_scale_factors_1(int *scf,struct gr_info_s *gr_info)
 431 {
 432    static const unsigned char slen[2][16] = {
 433      {0, 0, 0, 0, 3, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4},
 434      {0, 1, 2, 3, 0, 1, 2, 3, 1, 2, 3, 1, 2, 3, 2, 3}
 435    };
 436    int numbits;
 437    int num0 = slen[0][gr_info->scalefac_compress];
 438    int num1 = slen[1][gr_info->scalefac_compress];
 439
 440     if (gr_info->block_type == 2) {
 441       int i=18;
 442       numbits = (num0 + num1) * 18;
 443
 444       if (gr_info->mixed_block_flag) {
 445          for (i=8;i;i--)
 446            *scf++ = getbits_fast(num0);
 447          i = 9;
 448          numbits -= num0; /* num0 * 17 + num1 * 18 */
 449       }
 450
 451       for (;i;i--)
 452         *scf++ = getbits_fast(num0);
 453       for (i = 18; i; i--)
 454         *scf++ = getbits_fast(num1);
 455       *scf++ = 0; *scf++ = 0; *scf++ = 0; /* short[13][0..2] = 0 */
 456     }
 457     else {
 458       int i;
 459       int scfsi = gr_info->scfsi;
 460
 461       if(scfsi < 0) { /* scfsi < 0 => granule == 0 */
 462          for(i=11;i;i--)
 463            *scf++ = getbits_fast(num0);
 464          for(i=10;i;i--)
 465            *scf++ = getbits_fast(num1);
 466          numbits = (num0 + num1) * 10 + num0;
 467          *scf++ = 0;
 468       }
 469       else {
 470         numbits = 0;
 471         if(!(scfsi & 0x8)) {
 472           for (i=0;i<6;i++)
 473             *scf++ = getbits_fast(num0);
 474           numbits += num0 * 6;
 475         }
 476         else {
 477           scf += 6;
 478         }
 479
 480         if(!(scfsi & 0x4)) {
 481           for (i=0;i<5;i++)
 482             *scf++ = getbits_fast(num0);
 483           numbits += num0 * 5;
 484         }
 485         else {
 486           scf += 5;
 487         }
 488
 489         if(!(scfsi & 0x2)) {
 490           for(i=0;i<5;i++)
 491             *scf++ = getbits_fast(num1);
 492           numbits += num1 * 5;
 493         }
 494         else {
 495           scf += 5;
 496         }
 497
 498         if(!(scfsi & 0x1)) {
 499           for (i=0;i<5;i++)
 500             *scf++ = getbits_fast(num1);
 501           numbits += num1 * 5;
 502         }
 503         else {
 504            scf += 5;
 505         }
 506         *scf++ = 0;  /* no l[21] in original sources */
 507       }
 508     }
 509     return numbits;
 510 }
 511
 512 static int III_get_scale_factors_2(int *scf,struct gr_info_s *gr_info,int i_stereo)
 513 {
 514   unsigned char *pnt;
 515   int i,j;
 516   unsigned int slen;
 517   int n = 0;
 518   int numbits = 0;
 519
 520   static unsigned char stab[3][6][4] = {
 521    { { 6, 5, 5,5 } , { 6, 5, 7,3 } , { 11,10,0,0} ,
 522      { 7, 7, 7,0 } , { 6, 6, 6,3 } , {  8, 8,5,0} } ,
 523    { { 9, 9, 9,9 } , { 9, 9,12,6 } , { 18,18,0,0} ,
 524      {12,12,12,0 } , {12, 9, 9,6 } , { 15,12,9,0} } ,
 525    { { 6, 9, 9,9 } , { 6, 9,12,6 } , { 15,18,0,0} ,
 526      { 6,15,12,0 } , { 6,12, 9,6 } , {  6,18,9,0} } };
 527
 528   if(i_stereo) /* i_stereo AND second channel -> do_layer3() checks this */
 529     slen = i_slen2[gr_info->scalefac_compress>>1];
 530   else
 531     slen = n_slen2[gr_info->scalefac_compress];
 532
 533   gr_info->preflag = (slen>>15) & 0x1;
 534
 535   n = 0;
 536   if( gr_info->block_type == 2 ) {
 537     n++;
 538     if(gr_info->mixed_block_flag) n++;
 539   }
 540
 541   pnt = stab[n][(slen>>12)&0x7];
 542
 543   for(i=0;i<4;i++) {
 544     int num = slen & 0x7;
 545     slen >>= 3;
 546     if(num) {
 547       for(j=0;j<(int)(pnt[i]);j++) *scf++ = getbits_fast(num);
 548       numbits += pnt[i] * num;
 549     }
 550     else {
 551       for(j=0;j<(int)(pnt[i]);j++) *scf++ = 0;
 552     }
 553   }
 554
 555   n = (n << 1) + 1;
 556   for(i=0;i<n;i++) *scf++ = 0;
 557
 558   return numbits;
 559 }
 560
 561 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};
 562 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};
 563
 564 #define getbitoffset() ((-bitindex)&0x7)
 565 #define getbyte()      (*wordpointer++)
 566
 567 /*
 568  * Dequantize samples (includes huffman decoding)
 569  */
 570 /* 24 is enough because tab13 has max. a 19 bit huffvector */
 571 #define BITSHIFT ((sizeof(long)-1)*8)
 572 #define REFRESH_MASK \
 573   while(num < BITSHIFT) { \
 574     mask |= ((unsigned long)getbyte())<<(BITSHIFT-num); \
 575     num += 8; \
 576     part2remain -= 8; }
 577
 578 static int III_dequantize_sample(real xr[SBLIMIT][SSLIMIT],int *scf,
 579    struct gr_info_s *gr_info,int sfreq,int part2bits)
 580 {
 581   int shift = 1 + gr_info->scalefac_scale;
 582   real *xrpnt = (real *) xr;
 583   int l[3],l3;
 584   int part2remain = gr_info->part2_3_length - part2bits;
 585   int *me;
 586
 587   int num=getbitoffset();
 588   long mask;
 589   /* we must split this, because for num==0 the shift is undefined if you do it in one step */
 590   mask  = ((unsigned long) getbits(num))<<BITSHIFT;
 591   mask <<= 8-num;
 592   part2remain -= num;
 593
 594   {
 595     int bv       = gr_info->big_values;
 596     int region1  = gr_info->region1start;
 597     int region2  = gr_info->region2start;
 598
 599     l3 = ((576>>1)-bv)>>1;
 600 /*
 601  * we may lose the 'odd' bit here !!
 602  * check this later again
 603  */
 604     if(bv <= region1) {
 605       l[0] = bv; l[1] = l[2] = 0;
 606     }
 607     else {
 608       l[0] = region1;
 609       if(bv <= region2) {
 610         l[1] = bv - l[0];  l[2] = 0;
 611       }
 612       else {
 613         l[1] = region2 - l[0]; l[2] = bv - region2;
 614       }
 615     }
 616   }
 617
 618   if(gr_info->block_type == 2) {
 619     /*
 620      * decoding with short or mixed mode BandIndex table
 621      */
 622     int i,max[4];
 623     int step=0,lwin=3,cb=0;
 624     register real v = 0.0;
 625     register int *m,mc;
 626
 627     if(gr_info->mixed_block_flag) {
 628       max[3] = -1;
 629       max[0] = max[1] = max[2] = 2;
 630       m = map[sfreq][0];
 631       me = mapend[sfreq][0];
 632     }
 633     else {
 634       max[0] = max[1] = max[2] = max[3] = -1;
 635       /* max[3] not really needed in this case */
 636       m = map[sfreq][1];
 637       me = mapend[sfreq][1];
 638     }
 639
 640     mc = 0;
 641     for(i=0;i<2;i++) {
 642       int lp = l[i];
 643       struct newhuff *h = ht+gr_info->table_select[i];
 644       for(;lp;lp--,mc--) {
 645         register int x,y;
 646         if( (!mc) ) {
 647           mc    = *m++;
 648           xrpnt = ((real *) xr) + (*m++);
 649           lwin  = *m++;
 650           cb    = *m++;
 651           if(lwin == 3) {
 652             v = gr_info->pow2gain[(*scf++) << shift];
 653             step = 1;
 654           }
 655           else {
 656             v = gr_info->full_gain[lwin][(*scf++) << shift];
 657             step = 3;
 658           }
 659         }
 660         {
 661           register short *val = h->table;
 662           REFRESH_MASK;
 663           while((y=*val++)<0) {
 664             if (mask < 0)
 665               val -= y;
 666             num--;
 667             mask <<= 1;
 668           }
 669           x = y >> 4;
 670           y &= 0xf;
 671         }
 672         if(x == 15 && h->linbits) {
 673           max[lwin] = cb;
 674           REFRESH_MASK;
 675           x += ((unsigned long) mask) >> (BITSHIFT+8-h->linbits);
 676           num -= h->linbits+1;
 677           mask <<= h->linbits;
 678           if(mask < 0)
 679             *xrpnt = REAL_MUL(-ispow[x], v);
 680           else
 681             *xrpnt = REAL_MUL(ispow[x], v);
 682           mask <<= 1;
 683         }
 684         else if(x) {
 685           max[lwin] = cb;
 686           if(mask < 0)
 687             *xrpnt = REAL_MUL(-ispow[x], v);
 688           else
 689             *xrpnt = REAL_MUL(ispow[x], v);
 690           num--;
 691           mask <<= 1;
 692         }
 693         else
 694           *xrpnt = 0.0;
 695         xrpnt += step;
 696         if(y == 15 && h->linbits) {
 697           max[lwin] = cb;
 698           REFRESH_MASK;
 699           y += ((unsigned long) mask) >> (BITSHIFT+8-h->linbits);
 700           num -= h->linbits+1;
 701           mask <<= h->linbits;
 702           if(mask < 0)
 703             *xrpnt = REAL_MUL(-ispow[y], v);
 704           else
 705             *xrpnt = REAL_MUL(ispow[y], v);
 706           mask <<= 1;
 707         }
 708         else if(y) {
 709           max[lwin] = cb;
 710           if(mask < 0)
 711             *xrpnt = REAL_MUL(-ispow[y], v);
 712           else
 713             *xrpnt = REAL_MUL(ispow[y], v);
 714           num--;
 715           mask <<= 1;
 716         }
 717         else
 718           *xrpnt = 0.0;
 719         xrpnt += step;
 720       }
 721     }
 722
 723     for(;l3 && (part2remain+num > 0);l3--) {
 724       struct newhuff *h = htc+gr_info->count1table_select;
 725       register short *val = h->table,a;
 726
 727       REFRESH_MASK;
 728       while((a=*val++)<0) {
 729         if (mask < 0)
 730           val -= a;
 731         num--;
 732         mask <<= 1;
 733       }
 734       if(part2remain+num <= 0) {
 735         num -= part2remain+num;
 736         break;
 737       }
 738
 739       for(i=0;i<4;i++) {
 740         if(!(i & 1)) {
 741           if(!mc) {
 742             mc = *m++;
 743             xrpnt = ((real *) xr) + (*m++);
 744             lwin = *m++;
 745             cb = *m++;
 746             if(lwin == 3) {
 747               v = gr_info->pow2gain[(*scf++) << shift];
 748               step = 1;
 749             }
 750             else {
 751               v = gr_info->full_gain[lwin][(*scf++) << shift];
 752               step = 3;
 753             }
 754           }
 755           mc--;
 756         }
 757         if( (a & (0x8>>i)) ) {
 758           max[lwin] = cb;
 759           if(part2remain+num <= 0) {
 760             break;
 761           }
 762           if(mask < 0)
 763             *xrpnt = -v;
 764           else
 765             *xrpnt = v;
 766           num--;
 767           mask <<= 1;
 768         }
 769         else
 770           *xrpnt = 0.0;
 771         xrpnt += step;
 772       }
 773     }
 774
 775     if(lwin < 3) { /* short band? */
 776       while(1) {
 777         for(;mc > 0;mc--) {
 778           *xrpnt = 0.0; xrpnt += 3; /* short band -> step=3 */
 779           *xrpnt = 0.0; xrpnt += 3;
 780         }
 781         if(m >= me)
 782           break;
 783         mc    = *m++;
 784         xrpnt = ((real *) xr) + *m++;
 785         if(*m++ == 0)
 786           break; /* optimize: field will be set to zero at the end of the function */
 787         m++; /* cb */
 788       }
 789     }
 790
 791     gr_info->maxband[0] = max[0]+1;
 792     gr_info->maxband[1] = max[1]+1;
 793     gr_info->maxband[2] = max[2]+1;
 794     gr_info->maxbandl = max[3]+1;
 795
 796     {
 797       int rmax = max[0] > max[1] ? max[0] : max[1];
 798       rmax = (rmax > max[2] ? rmax : max[2]) + 1;
 799       gr_info->maxb = rmax ? shortLimit[sfreq][rmax] : longLimit[sfreq][max[3]+1];
 800     }
 801
 802   }
 803   else {
 804     /*
 805      * decoding with 'long' BandIndex table (block_type != 2)
 806      */
 807     int *pretab = gr_info->preflag ? pretab1 : pretab2;
 808     int i,max = -1;
 809     int cb = 0;
 810     int *m = map[sfreq][2];
 811     register real v = 0.0;
 812     int mc = 0;
 813
 814     /*
 815      * long hash table values
 816      */
 817     for(i=0;i<3;i++) {
 818       int lp = l[i];
 819       struct newhuff *h = ht+gr_info->table_select[i];
 820
 821       for(;lp;lp--,mc--) {
 822         int x,y;
 823
 824         if(!mc) {
 825           mc = *m++;
 826           cb = *m++;
 827 #ifdef CUT_HF
 828           if(cb == 21) {
 829             fprintf(stderr,"c");
 830             v = 0.0;
 831           }
 832           else
 833 #endif
 834             v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift];
 835
 836         }
 837         {
 838           register short *val = h->table;
 839           REFRESH_MASK;
 840           while((y=*val++)<0) {
 841             if (mask < 0)
 842               val -= y;
 843             num--;
 844             mask <<= 1;
 845           }
 846           x = y >> 4;
 847           y &= 0xf;
 848         }
 849
 850         if (x == 15 && h->linbits) {
 851           max = cb;
 852           REFRESH_MASK;
 853           x += ((unsigned long) mask) >> (BITSHIFT+8-h->linbits);
 854           num -= h->linbits+1;
 855           mask <<= h->linbits;
 856           if(mask < 0)
 857             *xrpnt++ = REAL_MUL(-ispow[x], v);
 858           else
 859             *xrpnt++ = REAL_MUL(ispow[x], v);
 860           mask <<= 1;
 861         }
 862         else if(x) {
 863           max = cb;
 864           if(mask < 0)
 865             *xrpnt++ = REAL_MUL(-ispow[x], v);
 866           else
 867             *xrpnt++ = REAL_MUL(ispow[x], v);
 868           num--;
 869           mask <<= 1;
 870         }
 871         else
 872           *xrpnt++ = 0.0;
 873
 874         if (y == 15 && h->linbits) {
 875           max = cb;
 876           REFRESH_MASK;
 877           y += ((unsigned long) mask) >> (BITSHIFT+8-h->linbits);
 878           num -= h->linbits+1;
 879           mask <<= h->linbits;
 880           if(mask < 0)
 881             *xrpnt++ = REAL_MUL(-ispow[y], v);
 882           else
 883             *xrpnt++ = REAL_MUL(ispow[y], v);
 884           mask <<= 1;
 885         }
 886         else if(y) {
 887           max = cb;
 888           if(mask < 0)
 889             *xrpnt++ = REAL_MUL(-ispow[y], v);
 890           else
 891             *xrpnt++ = REAL_MUL(ispow[y], v);
 892           num--;
 893           mask <<= 1;
 894         }
 895         else
 896           *xrpnt++ = 0.0;
 897       }
 898     }
 899
 900     /*
 901      * short (count1table) values
 902      */
 903     for(;l3 && (part2remain+num > 0);l3--) {
 904       struct newhuff *h = htc+gr_info->count1table_select;
 905       register short *val = h->table,a;
 906
 907       REFRESH_MASK;
 908       while((a=*val++)<0) {
 909         if (mask < 0)
 910           val -= a;
 911         num--;
 912         mask <<= 1;
 913       }
 914       if(part2remain+num <= 0) {
 915         num -= part2remain+num;
 916         break;
 917       }
 918
 919       for(i=0;i<4;i++) {
 920         if(!(i & 1)) {
 921           if(!mc) {
 922             mc = *m++;
 923             cb = *m++;
 924 #ifdef CUT_HF
 925             if(cb == 21) {
 926               fprintf(stderr,"c");
 927               v = 0.0;
 928             }
 929             else
 930 #endif
 931               v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift];
 932           }
 933           mc--;
 934         }
 935         if ( (a & (0x8>>i)) ) {
 936           max = cb;
 937           if(part2remain+num <= 0) {
 938             break;
 939           }
 940           if(mask < 0)
 941             *xrpnt++ = -v;
 942           else
 943             *xrpnt++ = v;
 944           num--;
 945           mask <<= 1;
 946         }
 947         else
 948           *xrpnt++ = 0.0;
 949       }
 950     }
 951
 952     gr_info->maxbandl = max+1;
 953     gr_info->maxb = longLimit[sfreq][gr_info->maxbandl];
 954   }
 955
 956   part2remain += num;
 957 //  backbits(num);
 958   bitindex -= num; wordpointer += (bitindex>>3); bitindex &= 0x7;
 959   num = 0;
 960
 961   while(xrpnt < &xr[SBLIMIT][0])
 962     *xrpnt++ = 0.0;
 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
 978
 979
 980 /*
 981  * III_stereo: calculate real channel values for Joint-I-Stereo-mode
 982  */
 983 static void III_i_stereo(real xr_buf[2][SBLIMIT][SSLIMIT],int *scalefac,
 984    struct gr_info_s *gr_info,int sfreq,int ms_stereo,int lsf)
 985 {
 986       real (*xr)[SBLIMIT*SSLIMIT] = (real (*)[SBLIMIT*SSLIMIT] ) xr_buf;
 987       const struct bandInfoStruct *bi = &bandInfo[sfreq];
 988
 989       const real *tab1,*tab2;
 990
 991       int tab;
 992       static const real *tabs[3][2][2] = {
 993          { { tan1_1,tan2_1 }     , { tan1_2,tan2_2 } },
 994          { { pow1_1[0],pow2_1[0] } , { pow1_2[0],pow2_2[0] } } ,
 995          { { pow1_1[1],pow2_1[1] } , { pow1_2[1],pow2_2[1] } }
 996       };
 997
 998       tab = lsf + (gr_info->scalefac_compress & lsf);
 999       tab1 = tabs[tab][ms_stereo][0];
1000       tab2 = tabs[tab][ms_stereo][1];
1001 #if 0
1002       if(lsf) {
1003         int p = gr_info->scalefac_compress & 0x1;
1004         if(ms_stereo) {
1005           tab1 = pow1_2[p]; tab2 = pow2_2[p];
1006         }
1007         else {
1008           tab1 = pow1_1[p]; tab2 = pow2_1[p];
1009         }
1010       }
1011       else {
1012         if(ms_stereo) {
1013           tab1 = tan1_2; tab2 = tan2_2;
1014         }
1015         else {
1016           tab1 = tan1_1; tab2 = tan2_1;
1017         }
1018       }
1019 #endif
1020
1021 //      printf("III_i_st: tab1=%p tab2=%p tab=%d ms=%d  \n", tab1, tab2, tab, ms_stereo);
1022
1023       if (gr_info->block_type == 2) {
1024          int lwin,do_l = 0;
1025          if( gr_info->mixed_block_flag )
1026            do_l = 1;
1027
1028          for (lwin=0;lwin<3;lwin++) { /* process each window */
1029              /* get first band with zero values */
1030            int is_p,sb,idx,sfb = gr_info->maxband[lwin];  /* sfb is minimal 3 for mixed mode */
1031            if(sfb > 3)
1032              do_l = 0;
1033
1034            for(;sfb<12;sfb++) {
1035              is_p = scalefac[sfb*3+lwin-gr_info->mixed_block_flag]; /* scale: 0-15 */
1036              if(is_p != 7) {
1037                real t1,t2;
1038                sb  = bi->shortDiff[sfb];
1039                idx = bi->shortIdx[sfb] + lwin;
1040                t1  = tab1[is_p]; t2 = tab2[is_p];
1041                for (; sb > 0; sb--,idx+=3) {
1042                  real v = xr[0][idx];
1043                  xr[0][idx] = REAL_MUL(v, t1);
1044                  xr[1][idx] = REAL_MUL(v, t2);
1045                }
1046              }
1047            }
1048
1049 #if 1
1050 /* in the original: copy 10 to 11 , here: copy 11 to 12
1051 maybe still wrong??? (copy 12 to 13?) */
1052            is_p = scalefac[11*3+lwin-gr_info->mixed_block_flag]; /* scale: 0-15 */
1053            sb   = bi->shortDiff[12];
1054            idx  = bi->shortIdx[12] + lwin;
1055 #else
1056            is_p = scalefac[10*3+lwin-gr_info->mixed_block_flag]; /* scale: 0-15 */
1057            sb   = bi->shortDiff[11];
1058            idx  = bi->shortIdx[11] + lwin;
1059 #endif
1060            if(is_p != 7) {
1061              real t1,t2;
1062              t1 = tab1[is_p]; t2 = tab2[is_p];
1063              for ( ; sb > 0; sb--,idx+=3 ) {
1064                real v = xr[0][idx];
1065                xr[0][idx] = REAL_MUL(v, t1);
1066                xr[1][idx] = REAL_MUL(v, t2);
1067              }
1068            }
1069          } /* end for(lwin; .. ; . ) */
1070
1071 /* also check l-part, if ALL bands in the three windows are 'empty'
1072  * and mode = mixed_mode
1073  */
1074          if (do_l) {
1075            int sfb = gr_info->maxbandl;
1076            int idx = bi->longIdx[sfb];
1077
1078            for ( ; sfb<8; sfb++ ) {
1079              int sb = bi->longDiff[sfb];
1080              int is_p = scalefac[sfb]; /* scale: 0-15 */
1081              if(is_p != 7) {
1082                real t1,t2;
1083                t1 = tab1[is_p]; t2 = tab2[is_p];
1084                for ( ; sb > 0; sb--,idx++) {
1085                  real v = xr[0][idx];
1086                  xr[0][idx] = REAL_MUL(v, t1);
1087                  xr[1][idx] = REAL_MUL(v, t2);
1088                }
1089              }
1090              else
1091                idx += sb;
1092            }
1093          }
1094       }
1095       else { /* ((gr_info->block_type != 2)) */
1096        int sfb = gr_info->maxbandl;
1097        int is_p,idx = bi->longIdx[sfb];
1098
1099 /* hmm ... maybe the maxbandl stuff for i-stereo is buggy? */
1100        if(sfb <= 21) {
1101         for ( ; sfb<21; sfb++) {
1102           int sb = bi->longDiff[sfb];
1103           is_p = scalefac[sfb]; /* scale: 0-15 */
1104           if(is_p != 7) {
1105             real t1,t2;
1106             t1 = tab1[is_p]; t2 = tab2[is_p];
1107             for ( ; sb > 0; sb--,idx++) {
1108                real v = xr[0][idx];
1109                xr[0][idx] = REAL_MUL(v, t1);
1110                xr[1][idx] = REAL_MUL(v, t2);
1111             }
1112           }
1113           else
1114             idx += sb;
1115         }
1116
1117         is_p = scalefac[20];
1118         if(is_p != 7) {  /* copy l-band 20 to l-band 21 */
1119           int sb;
1120           real t1 = tab1[is_p],t2 = tab2[is_p];
1121
1122           for ( sb = bi->longDiff[21]; sb > 0; sb--,idx++ ) {
1123             real v = xr[0][idx];
1124             xr[0][idx] = REAL_MUL(v, t1);
1125             xr[1][idx] = REAL_MUL(v, t2);
1126           }
1127         }
1128        }        /* end: if(sfb <= 21) */
1129       } /* ... */
1130 }
1131
1132 static void III_antialias(real xr[SBLIMIT][SSLIMIT],struct gr_info_s *gr_info) {
1133    int sblim;
1134
1135    if(gr_info->block_type == 2) {
1136       if(!gr_info->mixed_block_flag)
1137         return;
1138       sblim = 1;
1139    }
1140    else {
1141      sblim = gr_info->maxb-1;
1142    }
1143
1144    /* 31 alias-reduction operations between each pair of sub-bands */
1145    /* with 8 butterflies between each pair                         */
1146
1147    {
1148      int sb;
1149      real *xr1=(real *) xr[1];
1150
1151      for(sb=sblim;sb;sb--,xr1+=10) {
1152        int ss;
1153        real *cs=aa_cs,*ca=aa_ca;
1154        real *xr2 = xr1;
1155
1156        for(ss=7;ss>=0;ss--) {    /* upper and lower butterfly inputs */
1157          register real bu = *--xr2,bd = *xr1;
1158          *xr2   = (bu * (*cs)   ) - (bd * (*ca)   );
1159          *xr1++ = (bd * (*cs++) ) + (bu * (*ca++) );
1160        }
1161      }
1162
1163   }
1164 }
1165
1166 #include "dct64.c"
1167 #include "dct36.c"
1168 #include "dct12.c"
1169
1170 #include "decod386.c"
1171
1172 /*
1173  * III_hybrid
1174  */
1175
1176 static dct36_func_t dct36_func;
1177
1178 static void III_hybrid(real fsIn[SBLIMIT][SSLIMIT],real tsOut[SSLIMIT][SBLIMIT],
1179    int ch,struct gr_info_s *gr_info)
1180 {
1181    real *tspnt = (real *) tsOut;
1182    static real block[2][2][SBLIMIT*SSLIMIT] = { { { 0, } } };
1183    static int blc[2]={0,0};
1184    real *rawout1,*rawout2;
1185    int bt;
1186    int sb = 0;
1187
1188    {
1189      int b = blc[ch];
1190      rawout1=block[b][ch];
1191      b=-b+1;
1192      rawout2=block[b][ch];
1193      blc[ch] = b;
1194    }
1195
1196    if(gr_info->mixed_block_flag) {
1197      sb = 2;
1198      (*dct36_func)(fsIn[0],rawout1,rawout2,win[0],tspnt);
1199      (*dct36_func)(fsIn[1],rawout1+18,rawout2+18,win1[0],tspnt+1);
1200      rawout1 += 36; rawout2 += 36; tspnt += 2;
1201    }
1202
1203    bt = gr_info->block_type;
1204    if(bt == 2) {
1205      for (; sb<gr_info->maxb; sb+=2,tspnt+=2,rawout1+=36,rawout2+=36) {
1206        dct12(fsIn[sb],rawout1,rawout2,win[2],tspnt);
1207        dct12(fsIn[sb+1],rawout1+18,rawout2+18,win1[2],tspnt+1);
1208      }
1209    }
1210    else {
1211      for (; sb<gr_info->maxb; sb+=2,tspnt+=2,rawout1+=36,rawout2+=36) {
1212        (*dct36_func)(fsIn[sb],rawout1,rawout2,win[bt],tspnt);
1213        (*dct36_func)(fsIn[sb+1],rawout1+18,rawout2+18,win1[bt],tspnt+1);
1214      }
1215    }
1216
1217    for(;sb<SBLIMIT;sb++,tspnt++) {
1218      int i;
1219      for(i=0;i<SSLIMIT;i++) {
1220        tspnt[i*SBLIMIT] = *rawout1++;
1221        *rawout2++ = 0.0;
1222      }
1223    }
1224 }
1225
1226 /*
1227  * main layer3 handler
1228  */
1229 /* int do_layer3(struct frame *fr,int outmode,struct audio_info_struct *ai) */
1230 static int do_layer3(struct frame *fr,int single){
1231   int gr, ch, ss,clip=0;
1232   int scalefacs[2][39]; /* max 39 for short[13][3] mode, mixed: 38, long: 22 */
1233   struct III_sideinfo sideinfo;
1234   int stereo = fr->stereo;
1235   int ms_stereo,i_stereo;
1236   int sfreq = fr->sampling_frequency;
1237   int stereo1,granules;
1238
1239 //  if (fr->error_protection) getbits(16); /* skip crc */
1240
1241   if(stereo == 1) { /* stream is mono */
1242     stereo1 = 1;
1243     single = 0;
1244   } else
1245   if(single >= 0) /* stream is stereo, but force to mono */
1246     stereo1 = 1;
1247   else
1248     stereo1 = 2;
1249
1250   if(fr->mode == MPG_MD_JOINT_STEREO) {
1251     ms_stereo = (fr->mode_ext & 0x2)>>1;
1252     i_stereo  = fr->mode_ext & 0x1;
1253   } else
1254     ms_stereo = i_stereo = 0;
1255
1256   if(!III_get_side_info(&sideinfo,stereo,ms_stereo,sfreq,single,fr->lsf))
1257     return -1;
1258
1259   set_pointer(sideinfo.main_data_begin);
1260
1261   granules = (fr->lsf) ? 1 : 2;
1262   for (gr=0;gr<granules;gr++){
1263     DECLARE_ALIGNED(16, real, hybridIn[2][SBLIMIT][SSLIMIT]);
1264     DECLARE_ALIGNED(16, real, hybridOut[2][SSLIMIT][SBLIMIT]);
1265
1266     { struct gr_info_s *gr_info = &(sideinfo.ch[0].gr[gr]);
1267       int part2bits;
1268       if(fr->lsf)
1269         part2bits = III_get_scale_factors_2(scalefacs[0],gr_info,0);
1270       else
1271         part2bits = III_get_scale_factors_1(scalefacs[0],gr_info);
1272       if(III_dequantize_sample(hybridIn[0], scalefacs[0],gr_info,sfreq,part2bits))
1273         return clip;
1274     }
1275
1276     if(stereo == 2) {
1277       struct gr_info_s *gr_info = &(sideinfo.ch[1].gr[gr]);
1278
1279       int part2bits;
1280       if(fr->lsf)
1281         part2bits = III_get_scale_factors_2(scalefacs[1],gr_info,i_stereo);
1282       else
1283         part2bits = III_get_scale_factors_1(scalefacs[1],gr_info);
1284
1285       if(III_dequantize_sample(hybridIn[1],scalefacs[1],gr_info,sfreq,part2bits))
1286           return clip;
1287
1288       if(ms_stereo) {
1289         int i;
1290         int maxb = sideinfo.ch[0].gr[gr].maxb;
1291         if(sideinfo.ch[1].gr[gr].maxb > maxb)
1292             maxb = sideinfo.ch[1].gr[gr].maxb;
1293         for(i=0;i<SSLIMIT*maxb;i++) {
1294           real tmp0 = ((real *)hybridIn[0])[i];
1295           real tmp1 = ((real *)hybridIn[1])[i];
1296           ((real *)hybridIn[0])[i] = tmp0 + tmp1;
1297           ((real *)hybridIn[1])[i] = tmp0 - tmp1;
1298         }
1299       }
1300
1301       if(i_stereo)
1302         III_i_stereo(hybridIn,scalefacs[1],gr_info,sfreq,ms_stereo,fr->lsf);
1303
1304       if(ms_stereo || i_stereo || (single == 3) ) {
1305         if(gr_info->maxb > sideinfo.ch[0].gr[gr].maxb)
1306           sideinfo.ch[0].gr[gr].maxb = gr_info->maxb;
1307         else
1308           gr_info->maxb = sideinfo.ch[0].gr[gr].maxb;
1309       }
1310
1311       switch(single) {
1312         case 3: {
1313           register int i;
1314           register real *in0 = (real *) hybridIn[0],*in1 = (real *) hybridIn[1];
1315           for(i=0;i<SSLIMIT*gr_info->maxb;i++,in0++)
1316             *in0 = (*in0 + *in1++); /* *0.5 done by pow-scale */
1317           break; }
1318         case 1: {
1319           register int i;
1320           register real *in0 = (real *) hybridIn[0],*in1 = (real *) hybridIn[1];
1321           for(i=0;i<SSLIMIT*gr_info->maxb;i++)
1322             *in0++ = *in1++;
1323           break; }
1324       }
1325
1326     }  // if(stereo == 2)
1327
1328     for(ch=0;ch<stereo1;ch++) {
1329       struct gr_info_s *gr_info = &(sideinfo.ch[ch].gr[gr]);
1330                   III_antialias(hybridIn[ch],gr_info);
1331                   III_hybrid(hybridIn[ch], hybridOut[ch], ch,gr_info);
1332     }
1333
1334     for(ss=0;ss<SSLIMIT;ss++) {
1335       if(single >= 0) {
1336                     clip += (fr->synth_mono)(hybridOut[0][ss],pcm_sample,&pcm_point);
1337                 } else {
1338                   int p1 = pcm_point;
1339                     clip += (fr->synth)(hybridOut[0][ss],0,pcm_sample,&p1);
1340                     clip += (fr->synth)(hybridOut[1][ss],1,pcm_sample,&pcm_point);
1341       }
1342     }
1343
1344   }
1345
1346   return clip;
1347 }