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