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   1 /*
   2  * AAC coefficients encoder
   3  * Copyright (C) 2008-2009 Konstantin Shishkov
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  24  * AAC coefficients encoder
  25  */
  26
  27 /***********************************
  28  *              TODOs:
  29  * speedup quantizer selection
  30  * add sane pulse detection
  31  ***********************************/
  32
  33 #include <float.h>
  34 #include "avcodec.h"
  35 #include "put_bits.h"
  36 #include "aac.h"
  37 #include "aacenc.h"
  38 #include "aactab.h"
  39 #include "libavutil/libm.h"
  40
  41 /** bits needed to code codebook run value for long windows */
  42 static const uint8_t run_value_bits_long[64] = {
  43      5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,
  44      5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5, 10,
  45     10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
  46     10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 15
  47 };
  48
  49 /** bits needed to code codebook run value for short windows */
  50 static const uint8_t run_value_bits_short[16] = {
  51     3, 3, 3, 3, 3, 3, 3, 6, 6, 6, 6, 6, 6, 6, 6, 9
  52 };
  53
  54 static const uint8_t *run_value_bits[2] = {
  55     run_value_bits_long, run_value_bits_short
  56 };
  57
  58
  59 /**
  60  * Quantize one coefficient.
  61  * @return absolute value of the quantized coefficient
  62  * @see 3GPP TS26.403 5.6.2 "Scalefactor determination"
  63  */
  64 static av_always_inline int quant(float coef, const float Q)
  65 {
  66     float a = coef * Q;
  67     return sqrtf(a * sqrtf(a)) + 0.4054;
  68 }
  69
  70 static void quantize_bands(int *out, const float *in, const float *scaled,
  71                            int size, float Q34, int is_signed, int maxval)
  72 {
  73     int i;
  74     double qc;
  75     for (i = 0; i < size; i++) {
  76         qc = scaled[i] * Q34;
  77         out[i] = (int)FFMIN(qc + 0.4054, (double)maxval);
  78         if (is_signed && in[i] < 0.0f) {
  79             out[i] = -out[i];
  80         }
  81     }
  82 }
  83
  84 static void abs_pow34_v(float *out, const float *in, const int size)
  85 {
  86 #ifndef USE_REALLY_FULL_SEARCH
  87     int i;
  88     for (i = 0; i < size; i++) {
  89         float a = fabsf(in[i]);
  90         out[i] = sqrtf(a * sqrtf(a));
  91     }
  92 #endif /* USE_REALLY_FULL_SEARCH */
  93 }
  94
  95 static const uint8_t aac_cb_range [12] = {0, 3, 3, 3, 3, 9, 9, 8, 8, 13, 13, 17};
  96 static const uint8_t aac_cb_maxval[12] = {0, 1, 1, 2, 2, 4, 4, 7, 7, 12, 12, 16};
  97
  98 /**
  99  * Calculate rate distortion cost for quantizing with given codebook
 100  *
 101  * @return quantization distortion
 102  */
 103 static av_always_inline float quantize_and_encode_band_cost_template(
 104                                 struct AACEncContext *s,
 105                                 PutBitContext *pb, const float *in,
 106                                 const float *scaled, int size, int scale_idx,
 107                                 int cb, const float lambda, const float uplim,
 108                                 int *bits, int BT_ZERO, int BT_UNSIGNED,
 109                                 int BT_PAIR, int BT_ESC)
 110 {
 111     const float IQ = ff_aac_pow2sf_tab[200 + scale_idx - SCALE_ONE_POS + SCALE_DIV_512];
 112     const float  Q = ff_aac_pow2sf_tab[200 - scale_idx + SCALE_ONE_POS - SCALE_DIV_512];
 113     const float CLIPPED_ESCAPE = 165140.0f*IQ;
 114     int i, j;
 115     float cost = 0;
 116     const int dim = BT_PAIR ? 2 : 4;
 117     int resbits = 0;
 118     const float  Q34 = sqrtf(Q * sqrtf(Q));
 119     const int range  = aac_cb_range[cb];
 120     const int maxval = aac_cb_maxval[cb];
 121     int off;
 122
 123     if (BT_ZERO) {
 124         for (i = 0; i < size; i++)
 125             cost += in[i]*in[i];
 126         if (bits)
 127             *bits = 0;
 128         return cost * lambda;
 129     }
 130     if (!scaled) {
 131         abs_pow34_v(s->scoefs, in, size);
 132         scaled = s->scoefs;
 133     }
 134     quantize_bands(s->qcoefs, in, scaled, size, Q34, !BT_UNSIGNED, maxval);
 135     if (BT_UNSIGNED) {
 136         off = 0;
 137     } else {
 138         off = maxval;
 139     }
 140     for (i = 0; i < size; i += dim) {
 141         const float *vec;
 142         int *quants = s->qcoefs + i;
 143         int curidx = 0;
 144         int curbits;
 145         float rd = 0.0f;
 146         for (j = 0; j < dim; j++) {
 147             curidx *= range;
 148             curidx += quants[j] + off;
 149         }
 150         curbits =  ff_aac_spectral_bits[cb-1][curidx];
 151         vec     = &ff_aac_codebook_vectors[cb-1][curidx*dim];
 152         if (BT_UNSIGNED) {
 153             for (j = 0; j < dim; j++) {
 154                 float t = fabsf(in[i+j]);
 155                 float di;
 156                 if (BT_ESC && vec[j] == 64.0f) { //FIXME: slow
 157                     if (t >= CLIPPED_ESCAPE) {
 158                         di = t - CLIPPED_ESCAPE;
 159                         curbits += 21;
 160                     } else {
 161                         int c = av_clip(quant(t, Q), 0, 8191);
 162                         di = t - c*cbrtf(c)*IQ;
 163                         curbits += av_log2(c)*2 - 4 + 1;
 164                     }
 165                 } else {
 166                     di = t - vec[j]*IQ;
 167                 }
 168                 if (vec[j] != 0.0f)
 169                     curbits++;
 170                 rd += di*di;
 171             }
 172         } else {
 173             for (j = 0; j < dim; j++) {
 174                 float di = in[i+j] - vec[j]*IQ;
 175                 rd += di*di;
 176             }
 177         }
 178         cost    += rd * lambda + curbits;
 179         resbits += curbits;
 180         if (cost >= uplim)
 181             return uplim;
 182         if (pb) {
 183             put_bits(pb, ff_aac_spectral_bits[cb-1][curidx], ff_aac_spectral_codes[cb-1][curidx]);
 184             if (BT_UNSIGNED)
 185                 for (j = 0; j < dim; j++)
 186                     if (ff_aac_codebook_vectors[cb-1][curidx*dim+j] != 0.0f)
 187                         put_bits(pb, 1, in[i+j] < 0.0f);
 188             if (BT_ESC) {
 189                 for (j = 0; j < 2; j++) {
 190                     if (ff_aac_codebook_vectors[cb-1][curidx*2+j] == 64.0f) {
 191                         int coef = av_clip(quant(fabsf(in[i+j]), Q), 0, 8191);
 192                         int len = av_log2(coef);
 193
 194                         put_bits(pb, len - 4 + 1, (1 << (len - 4 + 1)) - 2);
 195                         put_bits(pb, len, coef & ((1 << len) - 1));
 196                     }
 197                 }
 198             }
 199         }
 200     }
 201
 202     if (bits)
 203         *bits = resbits;
 204     return cost;
 205 }
 206
 207 #define QUANTIZE_AND_ENCODE_BAND_COST_FUNC(NAME, BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC) \
 208 static float quantize_and_encode_band_cost_ ## NAME(                                        \
 209                                 struct AACEncContext *s,                                \
 210                                 PutBitContext *pb, const float *in,                     \
 211                                 const float *scaled, int size, int scale_idx,           \
 212                                 int cb, const float lambda, const float uplim,          \
 213                                 int *bits) {                                            \
 214     return quantize_and_encode_band_cost_template(                                      \
 215                                 s, pb, in, scaled, size, scale_idx,                     \
 216                                 BT_ESC ? ESC_BT : cb, lambda, uplim, bits,              \
 217                                 BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC);                 \
 218 }
 219
 220 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ZERO,  1, 0, 0, 0)
 221 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(SQUAD, 0, 0, 0, 0)
 222 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(UQUAD, 0, 1, 0, 0)
 223 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(SPAIR, 0, 0, 1, 0)
 224 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(UPAIR, 0, 1, 1, 0)
 225 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ESC,   0, 1, 1, 1)
 226
 227 static float (*const quantize_and_encode_band_cost_arr[])(
 228                                 struct AACEncContext *s,
 229                                 PutBitContext *pb, const float *in,
 230                                 const float *scaled, int size, int scale_idx,
 231                                 int cb, const float lambda, const float uplim,
 232                                 int *bits) = {
 233     quantize_and_encode_band_cost_ZERO,
 234     quantize_and_encode_band_cost_SQUAD,
 235     quantize_and_encode_band_cost_SQUAD,
 236     quantize_and_encode_band_cost_UQUAD,
 237     quantize_and_encode_band_cost_UQUAD,
 238     quantize_and_encode_band_cost_SPAIR,
 239     quantize_and_encode_band_cost_SPAIR,
 240     quantize_and_encode_band_cost_UPAIR,
 241     quantize_and_encode_band_cost_UPAIR,
 242     quantize_and_encode_band_cost_UPAIR,
 243     quantize_and_encode_band_cost_UPAIR,
 244     quantize_and_encode_band_cost_ESC,
 245 };
 246
 247 #define quantize_and_encode_band_cost(                                  \
 248                                 s, pb, in, scaled, size, scale_idx, cb, \
 249                                 lambda, uplim, bits)                    \
 250     quantize_and_encode_band_cost_arr[cb](                              \
 251                                 s, pb, in, scaled, size, scale_idx, cb, \
 252                                 lambda, uplim, bits)
 253
 254 static float quantize_band_cost(struct AACEncContext *s, const float *in,
 255                                 const float *scaled, int size, int scale_idx,
 256                                 int cb, const float lambda, const float uplim,
 257                                 int *bits)
 258 {
 259     return quantize_and_encode_band_cost(s, NULL, in, scaled, size, scale_idx,
 260                                          cb, lambda, uplim, bits);
 261 }
 262
 263 static void quantize_and_encode_band(struct AACEncContext *s, PutBitContext *pb,
 264                                      const float *in, int size, int scale_idx,
 265                                      int cb, const float lambda)
 266 {
 267     quantize_and_encode_band_cost(s, pb, in, NULL, size, scale_idx, cb, lambda,
 268                                   INFINITY, NULL);
 269 }
 270
 271 static float find_max_val(int group_len, int swb_size, const float *scaled) {
 272     float maxval = 0.0f;
 273     int w2, i;
 274     for (w2 = 0; w2 < group_len; w2++) {
 275         for (i = 0; i < swb_size; i++) {
 276             maxval = FFMAX(maxval, scaled[w2*128+i]);
 277         }
 278     }
 279     return maxval;
 280 }
 281
 282 static int find_min_book(float maxval, int sf) {
 283     float Q = ff_aac_pow2sf_tab[200 - sf + SCALE_ONE_POS - SCALE_DIV_512];
 284     float Q34 = sqrtf(Q * sqrtf(Q));
 285     int qmaxval, cb;
 286     qmaxval = maxval * Q34 + 0.4054f;
 287     if      (qmaxval ==  0) cb = 0;
 288     else if (qmaxval ==  1) cb = 1;
 289     else if (qmaxval ==  2) cb = 3;
 290     else if (qmaxval <=  4) cb = 5;
 291     else if (qmaxval <=  7) cb = 7;
 292     else if (qmaxval <= 12) cb = 9;
 293     else                    cb = 11;
 294     return cb;
 295 }
 296
 297 /**
 298  * structure used in optimal codebook search
 299  */
 300 typedef struct BandCodingPath {
 301     int prev_idx; ///< pointer to the previous path point
 302     float cost;   ///< path cost
 303     int run;
 304 } BandCodingPath;
 305
 306 /**
 307  * Encode band info for single window group bands.
 308  */
 309 static void encode_window_bands_info(AACEncContext *s, SingleChannelElement *sce,
 310                                      int win, int group_len, const float lambda)
 311 {
 312     BandCodingPath path[120][12];
 313     int w, swb, cb, start, start2, size;
 314     int i, j;
 315     const int max_sfb  = sce->ics.max_sfb;
 316     const int run_bits = sce->ics.num_windows == 1 ? 5 : 3;
 317     const int run_esc  = (1 << run_bits) - 1;
 318     int idx, ppos, count;
 319     int stackrun[120], stackcb[120], stack_len;
 320     float next_minrd = INFINITY;
 321     int next_mincb = 0;
 322
 323     abs_pow34_v(s->scoefs, sce->coeffs, 1024);
 324     start = win*128;
 325     for (cb = 0; cb < 12; cb++) {
 326         path[0][cb].cost     = 0.0f;
 327         path[0][cb].prev_idx = -1;
 328         path[0][cb].run      = 0;
 329     }
 330     for (swb = 0; swb < max_sfb; swb++) {
 331         start2 = start;
 332         size = sce->ics.swb_sizes[swb];
 333         if (sce->zeroes[win*16 + swb]) {
 334             for (cb = 0; cb < 12; cb++) {
 335                 path[swb+1][cb].prev_idx = cb;
 336                 path[swb+1][cb].cost     = path[swb][cb].cost;
 337                 path[swb+1][cb].run      = path[swb][cb].run + 1;
 338             }
 339         } else {
 340             float minrd = next_minrd;
 341             int mincb = next_mincb;
 342             next_minrd = INFINITY;
 343             next_mincb = 0;
 344             for (cb = 0; cb < 12; cb++) {
 345                 float cost_stay_here, cost_get_here;
 346                 float rd = 0.0f;
 347                 for (w = 0; w < group_len; w++) {
 348                     FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(win+w)*16+swb];
 349                     rd += quantize_band_cost(s, sce->coeffs + start + w*128,
 350                                              s->scoefs + start + w*128, size,
 351                                              sce->sf_idx[(win+w)*16+swb], cb,
 352                                              lambda / band->threshold, INFINITY, NULL);
 353                 }
 354                 cost_stay_here = path[swb][cb].cost + rd;
 355                 cost_get_here  = minrd              + rd + run_bits + 4;
 356                 if (   run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run]
 357                     != run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run+1])
 358                     cost_stay_here += run_bits;
 359                 if (cost_get_here < cost_stay_here) {
 360                     path[swb+1][cb].prev_idx = mincb;
 361                     path[swb+1][cb].cost     = cost_get_here;
 362                     path[swb+1][cb].run      = 1;
 363                 } else {
 364                     path[swb+1][cb].prev_idx = cb;
 365                     path[swb+1][cb].cost     = cost_stay_here;
 366                     path[swb+1][cb].run      = path[swb][cb].run + 1;
 367                 }
 368                 if (path[swb+1][cb].cost < next_minrd) {
 369                     next_minrd = path[swb+1][cb].cost;
 370                     next_mincb = cb;
 371                 }
 372             }
 373         }
 374         start += sce->ics.swb_sizes[swb];
 375     }
 376
 377     //convert resulting path from backward-linked list
 378     stack_len = 0;
 379     idx       = 0;
 380     for (cb = 1; cb < 12; cb++)
 381         if (path[max_sfb][cb].cost < path[max_sfb][idx].cost)
 382             idx = cb;
 383     ppos = max_sfb;
 384     while (ppos > 0) {
 385         cb = idx;
 386         stackrun[stack_len] = path[ppos][cb].run;
 387         stackcb [stack_len] = cb;
 388         idx = path[ppos-path[ppos][cb].run+1][cb].prev_idx;
 389         ppos -= path[ppos][cb].run;
 390         stack_len++;
 391     }
 392     //perform actual band info encoding
 393     start = 0;
 394     for (i = stack_len - 1; i >= 0; i--) {
 395         put_bits(&s->pb, 4, stackcb[i]);
 396         count = stackrun[i];
 397         memset(sce->zeroes + win*16 + start, !stackcb[i], count);
 398         //XXX: memset when band_type is also uint8_t
 399         for (j = 0; j < count; j++) {
 400             sce->band_type[win*16 + start] =  stackcb[i];
 401             start++;
 402         }
 403         while (count >= run_esc) {
 404             put_bits(&s->pb, run_bits, run_esc);
 405             count -= run_esc;
 406         }
 407         put_bits(&s->pb, run_bits, count);
 408     }
 409 }
 410
 411 static void codebook_trellis_rate(AACEncContext *s, SingleChannelElement *sce,
 412                                   int win, int group_len, const float lambda)
 413 {
 414     BandCodingPath path[120][12];
 415     int w, swb, cb, start, start2, size;
 416     int i, j;
 417     const int max_sfb  = sce->ics.max_sfb;
 418     const int run_bits = sce->ics.num_windows == 1 ? 5 : 3;
 419     const int run_esc  = (1 << run_bits) - 1;
 420     int idx, ppos, count;
 421     int stackrun[120], stackcb[120], stack_len;
 422     float next_minrd = INFINITY;
 423     int next_mincb = 0;
 424
 425     abs_pow34_v(s->scoefs, sce->coeffs, 1024);
 426     start = win*128;
 427     for (cb = 0; cb < 12; cb++) {
 428         path[0][cb].cost     = run_bits+4;
 429         path[0][cb].prev_idx = -1;
 430         path[0][cb].run      = 0;
 431     }
 432     for (swb = 0; swb < max_sfb; swb++) {
 433         start2 = start;
 434         size = sce->ics.swb_sizes[swb];
 435         if (sce->zeroes[win*16 + swb]) {
 436             for (cb = 0; cb < 12; cb++) {
 437                 path[swb+1][cb].prev_idx = cb;
 438                 path[swb+1][cb].cost     = path[swb][cb].cost;
 439                 path[swb+1][cb].run      = path[swb][cb].run + 1;
 440             }
 441         } else {
 442             float minrd = next_minrd;
 443             int mincb = next_mincb;
 444             int startcb = sce->band_type[win*16+swb];
 445             next_minrd = INFINITY;
 446             next_mincb = 0;
 447             for (cb = 0; cb < startcb; cb++) {
 448                 path[swb+1][cb].cost = 61450;
 449                 path[swb+1][cb].prev_idx = -1;
 450                 path[swb+1][cb].run = 0;
 451             }
 452             for (cb = startcb; cb < 12; cb++) {
 453                 float cost_stay_here, cost_get_here;
 454                 float rd = 0.0f;
 455                 for (w = 0; w < group_len; w++) {
 456                     rd += quantize_band_cost(s, sce->coeffs + start + w*128,
 457                                              s->scoefs + start + w*128, size,
 458                                              sce->sf_idx[(win+w)*16+swb], cb,
 459                                              0, INFINITY, NULL);
 460                 }
 461                 cost_stay_here = path[swb][cb].cost + rd;
 462                 cost_get_here  = minrd              + rd + run_bits + 4;
 463                 if (   run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run]
 464                     != run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run+1])
 465                     cost_stay_here += run_bits;
 466                 if (cost_get_here < cost_stay_here) {
 467                     path[swb+1][cb].prev_idx = mincb;
 468                     path[swb+1][cb].cost     = cost_get_here;
 469                     path[swb+1][cb].run      = 1;
 470                 } else {
 471                     path[swb+1][cb].prev_idx = cb;
 472                     path[swb+1][cb].cost     = cost_stay_here;
 473                     path[swb+1][cb].run      = path[swb][cb].run + 1;
 474                 }
 475                 if (path[swb+1][cb].cost < next_minrd) {
 476                     next_minrd = path[swb+1][cb].cost;
 477                     next_mincb = cb;
 478                 }
 479             }
 480         }
 481         start += sce->ics.swb_sizes[swb];
 482     }
 483
 484     //convert resulting path from backward-linked list
 485     stack_len = 0;
 486     idx       = 0;
 487     for (cb = 1; cb < 12; cb++)
 488         if (path[max_sfb][cb].cost < path[max_sfb][idx].cost)
 489             idx = cb;
 490     ppos = max_sfb;
 491     while (ppos > 0) {
 492         assert(idx >= 0);
 493         cb = idx;
 494         stackrun[stack_len] = path[ppos][cb].run;
 495         stackcb [stack_len] = cb;
 496         idx = path[ppos-path[ppos][cb].run+1][cb].prev_idx;
 497         ppos -= path[ppos][cb].run;
 498         stack_len++;
 499     }
 500     //perform actual band info encoding
 501     start = 0;
 502     for (i = stack_len - 1; i >= 0; i--) {
 503         put_bits(&s->pb, 4, stackcb[i]);
 504         count = stackrun[i];
 505         memset(sce->zeroes + win*16 + start, !stackcb[i], count);
 506         //XXX: memset when band_type is also uint8_t
 507         for (j = 0; j < count; j++) {
 508             sce->band_type[win*16 + start] =  stackcb[i];
 509             start++;
 510         }
 511         while (count >= run_esc) {
 512             put_bits(&s->pb, run_bits, run_esc);
 513             count -= run_esc;
 514         }
 515         put_bits(&s->pb, run_bits, count);
 516     }
 517 }
 518
 519 /** Return the minimum scalefactor where the quantized coef does not clip. */
 520 static av_always_inline uint8_t coef2minsf(float coef) {
 521     return av_clip_uint8(log2f(coef)*4 - 69 + SCALE_ONE_POS - SCALE_DIV_512);
 522 }
 523
 524 /** Return the maximum scalefactor where the quantized coef is not zero. */
 525 static av_always_inline uint8_t coef2maxsf(float coef) {
 526     return av_clip_uint8(log2f(coef)*4 +  6 + SCALE_ONE_POS - SCALE_DIV_512);
 527 }
 528
 529 typedef struct TrellisPath {
 530     float cost;
 531     int prev;
 532 } TrellisPath;
 533
 534 #define TRELLIS_STAGES 121
 535 #define TRELLIS_STATES (SCALE_MAX_DIFF+1)
 536
 537 static void search_for_quantizers_anmr(AVCodecContext *avctx, AACEncContext *s,
 538                                        SingleChannelElement *sce,
 539                                        const float lambda)
 540 {
 541     int q, w, w2, g, start = 0;
 542     int i, j;
 543     int idx;
 544     TrellisPath paths[TRELLIS_STAGES][TRELLIS_STATES];
 545     int bandaddr[TRELLIS_STAGES];
 546     int minq;
 547     float mincost;
 548     float q0f = FLT_MAX, q1f = 0.0f, qnrgf = 0.0f;
 549     int q0, q1, qcnt = 0;
 550
 551     for (i = 0; i < 1024; i++) {
 552         float t = fabsf(sce->coeffs[i]);
 553         if (t > 0.0f) {
 554             q0f = FFMIN(q0f, t);
 555             q1f = FFMAX(q1f, t);
 556             qnrgf += t*t;
 557             qcnt++;
 558         }
 559     }
 560
 561     if (!qcnt) {
 562         memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
 563         memset(sce->zeroes, 1, sizeof(sce->zeroes));
 564         return;
 565     }
 566
 567     //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
 568     q0 = coef2minsf(q0f);
 569     //maximum scalefactor index is when maximum coefficient after quantizing is still not zero
 570     q1 = coef2maxsf(q1f);
 571     //av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1);
 572     if (q1 - q0 > 60) {
 573         int q0low  = q0;
 574         int q1high = q1;
 575         //minimum scalefactor index is when maximum nonzero coefficient after quantizing is not clipped
 576         int qnrg = av_clip_uint8(log2f(sqrtf(qnrgf/qcnt))*4 - 31 + SCALE_ONE_POS - SCALE_DIV_512);
 577         q1 = qnrg + 30;
 578         q0 = qnrg - 30;
 579         //av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1);
 580         if (q0 < q0low) {
 581             q1 += q0low - q0;
 582             q0  = q0low;
 583         } else if (q1 > q1high) {
 584             q0 -= q1 - q1high;
 585             q1  = q1high;
 586         }
 587     }
 588     //av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1);
 589
 590     for (i = 0; i < TRELLIS_STATES; i++) {
 591         paths[0][i].cost    = 0.0f;
 592         paths[0][i].prev    = -1;
 593     }
 594     for (j = 1; j < TRELLIS_STAGES; j++) {
 595         for (i = 0; i < TRELLIS_STATES; i++) {
 596             paths[j][i].cost    = INFINITY;
 597             paths[j][i].prev    = -2;
 598         }
 599     }
 600     idx = 1;
 601     abs_pow34_v(s->scoefs, sce->coeffs, 1024);
 602     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 603         start = w*128;
 604         for (g = 0; g < sce->ics.num_swb; g++) {
 605             const float *coefs = sce->coeffs + start;
 606             float qmin, qmax;
 607             int nz = 0;
 608
 609             bandaddr[idx] = w * 16 + g;
 610             qmin = INT_MAX;
 611             qmax = 0.0f;
 612             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 613                 FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
 614                 if (band->energy <= band->threshold || band->threshold == 0.0f) {
 615                     sce->zeroes[(w+w2)*16+g] = 1;
 616                     continue;
 617                 }
 618                 sce->zeroes[(w+w2)*16+g] = 0;
 619                 nz = 1;
 620                 for (i = 0; i < sce->ics.swb_sizes[g]; i++) {
 621                     float t = fabsf(coefs[w2*128+i]);
 622                     if (t > 0.0f)
 623                         qmin = FFMIN(qmin, t);
 624                     qmax = FFMAX(qmax, t);
 625                 }
 626             }
 627             if (nz) {
 628                 int minscale, maxscale;
 629                 float minrd = INFINITY;
 630                 float maxval;
 631                 //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
 632                 minscale = coef2minsf(qmin);
 633                 //maximum scalefactor index is when maximum coefficient after quantizing is still not zero
 634                 maxscale = coef2maxsf(qmax);
 635                 minscale = av_clip(minscale - q0, 0, TRELLIS_STATES - 1);
 636                 maxscale = av_clip(maxscale - q0, 0, TRELLIS_STATES);
 637                 maxval = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], s->scoefs+start);
 638                 for (q = minscale; q < maxscale; q++) {
 639                     float dist = 0;
 640                     int cb = find_min_book(maxval, sce->sf_idx[w*16+g]);
 641                     for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 642                         FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
 643                         dist += quantize_band_cost(s, coefs + w2*128, s->scoefs + start + w2*128, sce->ics.swb_sizes[g],
 644                                                    q + q0, cb, lambda / band->threshold, INFINITY, NULL);
 645                     }
 646                     minrd = FFMIN(minrd, dist);
 647
 648                     for (i = 0; i < q1 - q0; i++) {
 649                         float cost;
 650                         cost = paths[idx - 1][i].cost + dist
 651                                + ff_aac_scalefactor_bits[q - i + SCALE_DIFF_ZERO];
 652                         if (cost < paths[idx][q].cost) {
 653                             paths[idx][q].cost    = cost;
 654                             paths[idx][q].prev    = i;
 655                         }
 656                     }
 657                 }
 658             } else {
 659                 for (q = 0; q < q1 - q0; q++) {
 660                     paths[idx][q].cost = paths[idx - 1][q].cost + 1;
 661                     paths[idx][q].prev = q;
 662                 }
 663             }
 664             sce->zeroes[w*16+g] = !nz;
 665             start += sce->ics.swb_sizes[g];
 666             idx++;
 667         }
 668     }
 669     idx--;
 670     mincost = paths[idx][0].cost;
 671     minq    = 0;
 672     for (i = 1; i < TRELLIS_STATES; i++) {
 673         if (paths[idx][i].cost < mincost) {
 674             mincost = paths[idx][i].cost;
 675             minq = i;
 676         }
 677     }
 678     while (idx) {
 679         sce->sf_idx[bandaddr[idx]] = minq + q0;
 680         minq = paths[idx][minq].prev;
 681         idx--;
 682     }
 683     //set the same quantizers inside window groups
 684     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
 685         for (g = 0;  g < sce->ics.num_swb; g++)
 686             for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)
 687                 sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
 688 }
 689
 690 /**
 691  * two-loop quantizers search taken from ISO 13818-7 Appendix C
 692  */
 693 static void search_for_quantizers_twoloop(AVCodecContext *avctx,
 694                                           AACEncContext *s,
 695                                           SingleChannelElement *sce,
 696                                           const float lambda)
 697 {
 698     int start = 0, i, w, w2, g;
 699     int destbits = avctx->bit_rate * 1024.0 / avctx->sample_rate / avctx->channels;
 700     float dists[128], uplims[128];
 701     float maxvals[128];
 702     int fflag, minscaler;
 703     int its  = 0;
 704     int allz = 0;
 705     float minthr = INFINITY;
 706
 707     //XXX: some heuristic to determine initial quantizers will reduce search time
 708     memset(dists, 0, sizeof(dists));
 709     //determine zero bands and upper limits
 710     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 711         for (g = 0;  g < sce->ics.num_swb; g++) {
 712             int nz = 0;
 713             float uplim = 0.0f;
 714             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 715                 FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
 716                 uplim += band->threshold;
 717                 if (band->energy <= band->threshold || band->threshold == 0.0f) {
 718                     sce->zeroes[(w+w2)*16+g] = 1;
 719                     continue;
 720                 }
 721                 nz = 1;
 722             }
 723             uplims[w*16+g] = uplim *512;
 724             sce->zeroes[w*16+g] = !nz;
 725             if (nz)
 726                 minthr = FFMIN(minthr, uplim);
 727             allz |= nz;
 728         }
 729     }
 730     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 731         for (g = 0;  g < sce->ics.num_swb; g++) {
 732             if (sce->zeroes[w*16+g]) {
 733                 sce->sf_idx[w*16+g] = SCALE_ONE_POS;
 734                 continue;
 735             }
 736             sce->sf_idx[w*16+g] = SCALE_ONE_POS + FFMIN(log2f(uplims[w*16+g]/minthr)*4,59);
 737         }
 738     }
 739
 740     if (!allz)
 741         return;
 742     abs_pow34_v(s->scoefs, sce->coeffs, 1024);
 743
 744     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 745         start = w*128;
 746         for (g = 0;  g < sce->ics.num_swb; g++) {
 747             const float *scaled = s->scoefs + start;
 748             maxvals[w*16+g] = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], scaled);
 749             start += sce->ics.swb_sizes[g];
 750         }
 751     }
 752
 753     //perform two-loop search
 754     //outer loop - improve quality
 755     do {
 756         int tbits, qstep;
 757         minscaler = sce->sf_idx[0];
 758         //inner loop - quantize spectrum to fit into given number of bits
 759         qstep = its ? 1 : 32;
 760         do {
 761             int prev = -1;
 762             tbits = 0;
 763             fflag = 0;
 764             for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 765                 start = w*128;
 766                 for (g = 0;  g < sce->ics.num_swb; g++) {
 767                     const float *coefs = sce->coeffs + start;
 768                     const float *scaled = s->scoefs + start;
 769                     int bits = 0;
 770                     int cb;
 771                     float dist = 0.0f;
 772
 773                     if (sce->zeroes[w*16+g] || sce->sf_idx[w*16+g] >= 218) {
 774                         start += sce->ics.swb_sizes[g];
 775                         continue;
 776                     }
 777                     minscaler = FFMIN(minscaler, sce->sf_idx[w*16+g]);
 778                     cb = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]);
 779                     for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 780                         int b;
 781                         dist += quantize_band_cost(s, coefs + w2*128,
 782                                                    scaled + w2*128,
 783                                                    sce->ics.swb_sizes[g],
 784                                                    sce->sf_idx[w*16+g],
 785                                                    cb,
 786                                                    1.0f,
 787                                                    INFINITY,
 788                                                    &b);
 789                         bits += b;
 790                     }
 791                     dists[w*16+g] = dist - bits;
 792                     if (prev != -1) {
 793                         bits += ff_aac_scalefactor_bits[sce->sf_idx[w*16+g] - prev + SCALE_DIFF_ZERO];
 794                     }
 795                     tbits += bits;
 796                     start += sce->ics.swb_sizes[g];
 797                     prev = sce->sf_idx[w*16+g];
 798                 }
 799             }
 800             if (tbits > destbits) {
 801                 for (i = 0; i < 128; i++)
 802                     if (sce->sf_idx[i] < 218 - qstep)
 803                         sce->sf_idx[i] += qstep;
 804             } else {
 805                 for (i = 0; i < 128; i++)
 806                     if (sce->sf_idx[i] > 60 - qstep)
 807                         sce->sf_idx[i] -= qstep;
 808             }
 809             qstep >>= 1;
 810             if (!qstep && tbits > destbits*1.02 && sce->sf_idx[0] < 217)
 811                 qstep = 1;
 812         } while (qstep);
 813
 814         fflag = 0;
 815         minscaler = av_clip(minscaler, 60, 255 - SCALE_MAX_DIFF);
 816         for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 817             for (g = 0; g < sce->ics.num_swb; g++) {
 818                 int prevsc = sce->sf_idx[w*16+g];
 819                 if (dists[w*16+g] > uplims[w*16+g] && sce->sf_idx[w*16+g] > 60) {
 820                     if (find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]-1))
 821                         sce->sf_idx[w*16+g]--;
 822                     else //Try to make sure there is some energy in every band
 823                         sce->sf_idx[w*16+g]-=2;
 824                 }
 825                 sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], minscaler, minscaler + SCALE_MAX_DIFF);
 826                 sce->sf_idx[w*16+g] = FFMIN(sce->sf_idx[w*16+g], 219);
 827                 if (sce->sf_idx[w*16+g] != prevsc)
 828                     fflag = 1;
 829                 sce->band_type[w*16+g] = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]);
 830             }
 831         }
 832         its++;
 833     } while (fflag && its < 10);
 834 }
 835
 836 static void search_for_quantizers_faac(AVCodecContext *avctx, AACEncContext *s,
 837                                        SingleChannelElement *sce,
 838                                        const float lambda)
 839 {
 840     int start = 0, i, w, w2, g;
 841     float uplim[128], maxq[128];
 842     int minq, maxsf;
 843     float distfact = ((sce->ics.num_windows > 1) ? 85.80 : 147.84) / lambda;
 844     int last = 0, lastband = 0, curband = 0;
 845     float avg_energy = 0.0;
 846     if (sce->ics.num_windows == 1) {
 847         start = 0;
 848         for (i = 0; i < 1024; i++) {
 849             if (i - start >= sce->ics.swb_sizes[curband]) {
 850                 start += sce->ics.swb_sizes[curband];
 851                 curband++;
 852             }
 853             if (sce->coeffs[i]) {
 854                 avg_energy += sce->coeffs[i] * sce->coeffs[i];
 855                 last = i;
 856                 lastband = curband;
 857             }
 858         }
 859     } else {
 860         for (w = 0; w < 8; w++) {
 861             const float *coeffs = sce->coeffs + w*128;
 862             start = 0;
 863             for (i = 0; i < 128; i++) {
 864                 if (i - start >= sce->ics.swb_sizes[curband]) {
 865                     start += sce->ics.swb_sizes[curband];
 866                     curband++;
 867                 }
 868                 if (coeffs[i]) {
 869                     avg_energy += coeffs[i] * coeffs[i];
 870                     last = FFMAX(last, i);
 871                     lastband = FFMAX(lastband, curband);
 872                 }
 873             }
 874         }
 875     }
 876     last++;
 877     avg_energy /= last;
 878     if (avg_energy == 0.0f) {
 879         for (i = 0; i < FF_ARRAY_ELEMS(sce->sf_idx); i++)
 880             sce->sf_idx[i] = SCALE_ONE_POS;
 881         return;
 882     }
 883     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 884         start = w*128;
 885         for (g = 0; g < sce->ics.num_swb; g++) {
 886             float *coefs   = sce->coeffs + start;
 887             const int size = sce->ics.swb_sizes[g];
 888             int start2 = start, end2 = start + size, peakpos = start;
 889             float maxval = -1, thr = 0.0f, t;
 890             maxq[w*16+g] = 0.0f;
 891             if (g > lastband) {
 892                 maxq[w*16+g] = 0.0f;
 893                 start += size;
 894                 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++)
 895                     memset(coefs + w2*128, 0, sizeof(coefs[0])*size);
 896                 continue;
 897             }
 898             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 899                 for (i = 0; i < size; i++) {
 900                     float t = coefs[w2*128+i]*coefs[w2*128+i];
 901                     maxq[w*16+g] = FFMAX(maxq[w*16+g], fabsf(coefs[w2*128 + i]));
 902                     thr += t;
 903                     if (sce->ics.num_windows == 1 && maxval < t) {
 904                         maxval  = t;
 905                         peakpos = start+i;
 906                     }
 907                 }
 908             }
 909             if (sce->ics.num_windows == 1) {
 910                 start2 = FFMAX(peakpos - 2, start2);
 911                 end2   = FFMIN(peakpos + 3, end2);
 912             } else {
 913                 start2 -= start;
 914                 end2   -= start;
 915             }
 916             start += size;
 917             thr = pow(thr / (avg_energy * (end2 - start2)), 0.3 + 0.1*(lastband - g) / lastband);
 918             t   = 1.0 - (1.0 * start2 / last);
 919             uplim[w*16+g] = distfact / (1.4 * thr + t*t*t + 0.075);
 920         }
 921     }
 922     memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
 923     abs_pow34_v(s->scoefs, sce->coeffs, 1024);
 924     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 925         start = w*128;
 926         for (g = 0;  g < sce->ics.num_swb; g++) {
 927             const float *coefs  = sce->coeffs + start;
 928             const float *scaled = s->scoefs   + start;
 929             const int size      = sce->ics.swb_sizes[g];
 930             int scf, prev_scf, step;
 931             int min_scf = -1, max_scf = 256;
 932             float curdiff;
 933             if (maxq[w*16+g] < 21.544) {
 934                 sce->zeroes[w*16+g] = 1;
 935                 start += size;
 936                 continue;
 937             }
 938             sce->zeroes[w*16+g] = 0;
 939             scf  = prev_scf = av_clip(SCALE_ONE_POS - SCALE_DIV_512 - log2f(1/maxq[w*16+g])*16/3, 60, 218);
 940             step = 16;
 941             for (;;) {
 942                 float dist = 0.0f;
 943                 int quant_max;
 944
 945                 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 946                     int b;
 947                     dist += quantize_band_cost(s, coefs + w2*128,
 948                                                scaled + w2*128,
 949                                                sce->ics.swb_sizes[g],
 950                                                scf,
 951                                                ESC_BT,
 952                                                lambda,
 953                                                INFINITY,
 954                                                &b);
 955                     dist -= b;
 956                 }
 957                 dist *= 1.0f / 512.0f / lambda;
 958                 quant_max = quant(maxq[w*16+g], ff_aac_pow2sf_tab[200 - scf + SCALE_ONE_POS - SCALE_DIV_512]);
 959                 if (quant_max >= 8191) { // too much, return to the previous quantizer
 960                     sce->sf_idx[w*16+g] = prev_scf;
 961                     break;
 962                 }
 963                 prev_scf = scf;
 964                 curdiff = fabsf(dist - uplim[w*16+g]);
 965                 if (curdiff <= 1.0f)
 966                     step = 0;
 967                 else
 968                     step = log2f(curdiff);
 969                 if (dist > uplim[w*16+g])
 970                     step = -step;
 971                 scf += step;
 972                 scf = av_clip_uint8(scf);
 973                 step = scf - prev_scf;
 974                 if (FFABS(step) <= 1 || (step > 0 && scf >= max_scf) || (step < 0 && scf <= min_scf)) {
 975                     sce->sf_idx[w*16+g] = av_clip(scf, min_scf, max_scf);
 976                     break;
 977                 }
 978                 if (step > 0)
 979                     min_scf = prev_scf;
 980                 else
 981                     max_scf = prev_scf;
 982             }
 983             start += size;
 984         }
 985     }
 986     minq = sce->sf_idx[0] ? sce->sf_idx[0] : INT_MAX;
 987     for (i = 1; i < 128; i++) {
 988         if (!sce->sf_idx[i])
 989             sce->sf_idx[i] = sce->sf_idx[i-1];
 990         else
 991             minq = FFMIN(minq, sce->sf_idx[i]);
 992     }
 993     if (minq == INT_MAX)
 994         minq = 0;
 995     minq = FFMIN(minq, SCALE_MAX_POS);
 996     maxsf = FFMIN(minq + SCALE_MAX_DIFF, SCALE_MAX_POS);
 997     for (i = 126; i >= 0; i--) {
 998         if (!sce->sf_idx[i])
 999             sce->sf_idx[i] = sce->sf_idx[i+1];
1000         sce->sf_idx[i] = av_clip(sce->sf_idx[i], minq, maxsf);
1001     }
1002 }
1003
1004 static void search_for_quantizers_fast(AVCodecContext *avctx, AACEncContext *s,
1005                                        SingleChannelElement *sce,
1006                                        const float lambda)
1007 {
1008     int start = 0, i, w, w2, g;
1009     int minq = 255;
1010
1011     memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
1012     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
1013         start = w*128;
1014         for (g = 0; g < sce->ics.num_swb; g++) {
1015             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
1016                 FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
1017                 if (band->energy <= band->threshold) {
1018                     sce->sf_idx[(w+w2)*16+g] = 218;
1019                     sce->zeroes[(w+w2)*16+g] = 1;
1020                 } else {
1021                     sce->sf_idx[(w+w2)*16+g] = av_clip(SCALE_ONE_POS - SCALE_DIV_512 + log2f(band->threshold), 80, 218);
1022                     sce->zeroes[(w+w2)*16+g] = 0;
1023                 }
1024                 minq = FFMIN(minq, sce->sf_idx[(w+w2)*16+g]);
1025             }
1026         }
1027     }
1028     for (i = 0; i < 128; i++) {
1029         sce->sf_idx[i] = 140;
1030         //av_clip(sce->sf_idx[i], minq, minq + SCALE_MAX_DIFF - 1);
1031     }
1032     //set the same quantizers inside window groups
1033     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
1034         for (g = 0;  g < sce->ics.num_swb; g++)
1035             for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)
1036                 sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
1037 }
1038
1039 static void search_for_ms(AACEncContext *s, ChannelElement *cpe,
1040                           const float lambda)
1041 {
1042     int start = 0, i, w, w2, g;
1043     float M[128], S[128];
1044     float *L34 = s->scoefs, *R34 = s->scoefs + 128, *M34 = s->scoefs + 128*2, *S34 = s->scoefs + 128*3;
1045     SingleChannelElement *sce0 = &cpe->ch[0];
1046     SingleChannelElement *sce1 = &cpe->ch[1];
1047     if (!cpe->common_window)
1048         return;
1049     for (w = 0; w < sce0->ics.num_windows; w += sce0->ics.group_len[w]) {
1050         for (g = 0;  g < sce0->ics.num_swb; g++) {
1051             if (!cpe->ch[0].zeroes[w*16+g] && !cpe->ch[1].zeroes[w*16+g]) {
1052                 float dist1 = 0.0f, dist2 = 0.0f;
1053                 for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {
1054                     FFPsyBand *band0 = &s->psy.psy_bands[(s->cur_channel+0)*PSY_MAX_BANDS+(w+w2)*16+g];
1055                     FFPsyBand *band1 = &s->psy.psy_bands[(s->cur_channel+1)*PSY_MAX_BANDS+(w+w2)*16+g];
1056                     float minthr = FFMIN(band0->threshold, band1->threshold);
1057                     float maxthr = FFMAX(band0->threshold, band1->threshold);
1058                     for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {
1059                         M[i] = (sce0->coeffs[start+w2*128+i]
1060                               + sce1->coeffs[start+w2*128+i]) * 0.5;
1061                         S[i] =  M[i]
1062                               - sce1->coeffs[start+w2*128+i];
1063                     }
1064                     abs_pow34_v(L34, sce0->coeffs+start+w2*128, sce0->ics.swb_sizes[g]);
1065                     abs_pow34_v(R34, sce1->coeffs+start+w2*128, sce0->ics.swb_sizes[g]);
1066                     abs_pow34_v(M34, M,                         sce0->ics.swb_sizes[g]);
1067                     abs_pow34_v(S34, S,                         sce0->ics.swb_sizes[g]);
1068                     dist1 += quantize_band_cost(s, sce0->coeffs + start + w2*128,
1069                                                 L34,
1070                                                 sce0->ics.swb_sizes[g],
1071                                                 sce0->sf_idx[(w+w2)*16+g],
1072                                                 sce0->band_type[(w+w2)*16+g],
1073                                                 lambda / band0->threshold, INFINITY, NULL);
1074                     dist1 += quantize_band_cost(s, sce1->coeffs + start + w2*128,
1075                                                 R34,
1076                                                 sce1->ics.swb_sizes[g],
1077                                                 sce1->sf_idx[(w+w2)*16+g],
1078                                                 sce1->band_type[(w+w2)*16+g],
1079                                                 lambda / band1->threshold, INFINITY, NULL);
1080                     dist2 += quantize_band_cost(s, M,
1081                                                 M34,
1082                                                 sce0->ics.swb_sizes[g],
1083                                                 sce0->sf_idx[(w+w2)*16+g],
1084                                                 sce0->band_type[(w+w2)*16+g],
1085                                                 lambda / maxthr, INFINITY, NULL);
1086                     dist2 += quantize_band_cost(s, S,
1087                                                 S34,
1088                                                 sce1->ics.swb_sizes[g],
1089                                                 sce1->sf_idx[(w+w2)*16+g],
1090                                                 sce1->band_type[(w+w2)*16+g],
1091                                                 lambda / minthr, INFINITY, NULL);
1092                 }
1093                 cpe->ms_mask[w*16+g] = dist2 < dist1;
1094             }
1095             start += sce0->ics.swb_sizes[g];
1096         }
1097     }
1098 }
1099
1100 AACCoefficientsEncoder ff_aac_coders[] = {
1101     {
1102         search_for_quantizers_faac,
1103         encode_window_bands_info,
1104         quantize_and_encode_band,
1105         search_for_ms,
1106     },
1107     {
1108         search_for_quantizers_anmr,
1109         encode_window_bands_info,
1110         quantize_and_encode_band,
1111         search_for_ms,
1112     },
1113     {
1114         search_for_quantizers_twoloop,
1115         codebook_trellis_rate,
1116         quantize_and_encode_band,
1117         search_for_ms,
1118     },
1119     {
1120         search_for_quantizers_fast,
1121         encode_window_bands_info,
1122         quantize_and_encode_band,
1123         search_for_ms,
1124     },
1125 };