git.sesse.net Git - ffmpeg/blob - libavcodec/aaccoder.c

   1 /*
   2  * AAC coefficients encoder
   3  * Copyright (C) 2008-2009 Konstantin Shishkov
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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, k;
 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 (k = 0; k < dim; k++) {
 153                     float t = fabsf(in[i+k]);
 154                     float di;
 155                     if (BT_ESC && vec[k] == 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[k]*IQ;
 166                     }
 167                     if (vec[k] != 0.0f)
 168                         curbits++;
 169                     rd += di*di;
 170                 }
 171             } else {
 172                 for (k = 0; k < dim; k++) {
 173                     float di = in[i+k] - vec[k]*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 typedef struct TrellisPath {
 519     float cost;
 520     int prev;
 521 } TrellisPath;
 522
 523 #define TRELLIS_STAGES 121
 524 #define TRELLIS_STATES (SCALE_MAX_DIFF+1)
 525
 526 static void search_for_quantizers_anmr(AVCodecContext *avctx, AACEncContext *s,
 527                                        SingleChannelElement *sce,
 528                                        const float lambda)
 529 {
 530     int q, w, w2, g, start = 0;
 531     int i, j;
 532     int idx;
 533     TrellisPath paths[TRELLIS_STAGES][TRELLIS_STATES];
 534     int bandaddr[TRELLIS_STAGES];
 535     int minq;
 536     float mincost;
 537     float q0f = FLT_MAX, q1f = 0.0f, qnrgf = 0.0f;
 538     int q0, q1, qcnt = 0;
 539
 540     for (i = 0; i < 1024; i++) {
 541         float t = fabsf(sce->coeffs[i]);
 542         if (t > 0.0f) {
 543             q0f = FFMIN(q0f, t);
 544             q1f = FFMAX(q1f, t);
 545             qnrgf += t*t;
 546             qcnt++;
 547         }
 548     }
 549
 550     if (!qcnt) {
 551         memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
 552         memset(sce->zeroes, 1, sizeof(sce->zeroes));
 553         return;
 554     }
 555
 556     //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
 557     q0 = av_clip_uint8(log2(q0f)*4 - 69 + SCALE_ONE_POS - SCALE_DIV_512);
 558     //maximum scalefactor index is when maximum coefficient after quantizing is still not zero
 559     q1 = av_clip_uint8(log2(q1f)*4 +  6 + SCALE_ONE_POS - SCALE_DIV_512);
 560     //av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1);
 561     if (q1 - q0 > 60) {
 562         int q0low  = q0;
 563         int q1high = q1;
 564         //minimum scalefactor index is when maximum nonzero coefficient after quantizing is not clipped
 565         int qnrg = av_clip_uint8(log2(sqrt(qnrgf/qcnt))*4 - 31 + SCALE_ONE_POS - SCALE_DIV_512);
 566         q1 = qnrg + 30;
 567         q0 = qnrg - 30;
 568     //av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1);
 569         if (q0 < q0low) {
 570             q1 += q0low - q0;
 571             q0  = q0low;
 572         } else if (q1 > q1high) {
 573             q0 -= q1 - q1high;
 574             q1  = q1high;
 575         }
 576     }
 577     //av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1);
 578
 579     for (i = 0; i < TRELLIS_STATES; i++) {
 580         paths[0][i].cost    = 0.0f;
 581         paths[0][i].prev    = -1;
 582     }
 583     for (j = 1; j < TRELLIS_STAGES; j++) {
 584         for (i = 0; i < TRELLIS_STATES; i++) {
 585             paths[j][i].cost    = INFINITY;
 586             paths[j][i].prev    = -2;
 587         }
 588     }
 589     idx = 1;
 590     abs_pow34_v(s->scoefs, sce->coeffs, 1024);
 591     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 592         start = w*128;
 593         for (g = 0; g < sce->ics.num_swb; g++) {
 594             const float *coefs = sce->coeffs + start;
 595             float qmin, qmax;
 596             int nz = 0;
 597
 598             bandaddr[idx] = w * 16 + g;
 599             qmin = INT_MAX;
 600             qmax = 0.0f;
 601             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 602                 FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
 603                 if (band->energy <= band->threshold || band->threshold == 0.0f) {
 604                     sce->zeroes[(w+w2)*16+g] = 1;
 605                     continue;
 606                 }
 607                 sce->zeroes[(w+w2)*16+g] = 0;
 608                 nz = 1;
 609                 for (i = 0; i < sce->ics.swb_sizes[g]; i++) {
 610                     float t = fabsf(coefs[w2*128+i]);
 611                     if (t > 0.0f)
 612                         qmin = FFMIN(qmin, t);
 613                     qmax = FFMAX(qmax, t);
 614                 }
 615             }
 616             if (nz) {
 617                 int minscale, maxscale;
 618                 float minrd = INFINITY;
 619                 float maxval;
 620                 //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
 621                 minscale = av_clip_uint8(log2(qmin)*4 - 69 + SCALE_ONE_POS - SCALE_DIV_512);
 622                 //maximum scalefactor index is when maximum coefficient after quantizing is still not zero
 623                 maxscale = av_clip_uint8(log2(qmax)*4 +  6 + SCALE_ONE_POS - SCALE_DIV_512);
 624                 minscale = av_clip(minscale - q0, 0, TRELLIS_STATES - 1);
 625                 maxscale = av_clip(maxscale - q0, 0, TRELLIS_STATES);
 626                 maxval = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], s->scoefs+start);
 627                 for (q = minscale; q < maxscale; q++) {
 628                     float dist = 0;
 629                     int cb = find_min_book(maxval, sce->sf_idx[w*16+g]);
 630                     for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 631                         FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
 632                         dist += quantize_band_cost(s, coefs + w2*128, s->scoefs + start + w2*128, sce->ics.swb_sizes[g],
 633                                                    q + q0, cb, lambda / band->threshold, INFINITY, NULL);
 634                     }
 635                     minrd = FFMIN(minrd, dist);
 636
 637                     for (i = 0; i < q1 - q0; i++) {
 638                         float cost;
 639                         cost = paths[idx - 1][i].cost + dist
 640                                + ff_aac_scalefactor_bits[q - i + SCALE_DIFF_ZERO];
 641                         if (cost < paths[idx][q].cost) {
 642                             paths[idx][q].cost    = cost;
 643                             paths[idx][q].prev    = i;
 644                         }
 645                     }
 646                 }
 647             } else {
 648                 for (q = 0; q < q1 - q0; q++) {
 649                     paths[idx][q].cost = paths[idx - 1][q].cost + 1;
 650                     paths[idx][q].prev = q;
 651                 }
 652             }
 653             sce->zeroes[w*16+g] = !nz;
 654             start += sce->ics.swb_sizes[g];
 655             idx++;
 656         }
 657     }
 658     idx--;
 659     mincost = paths[idx][0].cost;
 660     minq    = 0;
 661     for (i = 1; i < TRELLIS_STATES; i++) {
 662         if (paths[idx][i].cost < mincost) {
 663             mincost = paths[idx][i].cost;
 664             minq = i;
 665         }
 666     }
 667     while (idx) {
 668         sce->sf_idx[bandaddr[idx]] = minq + q0;
 669         minq = paths[idx][minq].prev;
 670         idx--;
 671     }
 672     //set the same quantizers inside window groups
 673     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
 674         for (g = 0;  g < sce->ics.num_swb; g++)
 675             for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)
 676                 sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
 677 }
 678
 679 /**
 680  * two-loop quantizers search taken from ISO 13818-7 Appendix C
 681  */
 682 static void search_for_quantizers_twoloop(AVCodecContext *avctx,
 683                                           AACEncContext *s,
 684                                           SingleChannelElement *sce,
 685                                           const float lambda)
 686 {
 687     int start = 0, i, w, w2, g;
 688     int destbits = avctx->bit_rate * 1024.0 / avctx->sample_rate / avctx->channels;
 689     float dists[128], uplims[128];
 690     int fflag, minscaler;
 691     int its  = 0;
 692     int allz = 0;
 693     float minthr = INFINITY;
 694
 695     //XXX: some heuristic to determine initial quantizers will reduce search time
 696     memset(dists, 0, sizeof(dists));
 697     //determine zero bands and upper limits
 698     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 699         for (g = 0;  g < sce->ics.num_swb; g++) {
 700             int nz = 0;
 701             float uplim = 0.0f;
 702             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 703                 FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
 704                 uplim += band->threshold;
 705                 if (band->energy <= band->threshold || band->threshold == 0.0f) {
 706                     sce->zeroes[(w+w2)*16+g] = 1;
 707                     continue;
 708                 }
 709                 nz = 1;
 710             }
 711             uplims[w*16+g] = uplim *512;
 712             sce->zeroes[w*16+g] = !nz;
 713             if (nz)
 714                 minthr = FFMIN(minthr, uplim);
 715             allz = FFMAX(allz, nz);
 716         }
 717     }
 718     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 719         for (g = 0;  g < sce->ics.num_swb; g++) {
 720             if (sce->zeroes[w*16+g]) {
 721                 sce->sf_idx[w*16+g] = SCALE_ONE_POS;
 722                 continue;
 723             }
 724             sce->sf_idx[w*16+g] = SCALE_ONE_POS + FFMIN(log2(uplims[w*16+g]/minthr)*4,59);
 725         }
 726     }
 727
 728     if (!allz)
 729         return;
 730     abs_pow34_v(s->scoefs, sce->coeffs, 1024);
 731     //perform two-loop search
 732     //outer loop - improve quality
 733     do {
 734         int tbits, qstep;
 735         minscaler = sce->sf_idx[0];
 736         //inner loop - quantize spectrum to fit into given number of bits
 737         qstep = its ? 1 : 32;
 738         do {
 739             int prev = -1;
 740             tbits = 0;
 741             fflag = 0;
 742             for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 743                 start = w*128;
 744                 for (g = 0;  g < sce->ics.num_swb; g++) {
 745                     const float *coefs = sce->coeffs + start;
 746                     const float *scaled = s->scoefs + start;
 747                     int bits = 0;
 748                     int cb;
 749                     float dist = 0.0f;
 750
 751                     if (sce->zeroes[w*16+g] || sce->sf_idx[w*16+g] >= 218) {
 752                         start += sce->ics.swb_sizes[g];
 753                         continue;
 754                     }
 755                     minscaler = FFMIN(minscaler, sce->sf_idx[w*16+g]);
 756                     cb = find_min_book(find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], scaled), sce->sf_idx[w*16+g]);
 757                     for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 758                         int b;
 759                         dist += quantize_band_cost(s, coefs + w2*128,
 760                                                    scaled + w2*128,
 761                                                    sce->ics.swb_sizes[g],
 762                                                    sce->sf_idx[w*16+g],
 763                                                    cb,
 764                                                    1.0f,
 765                                                    INFINITY,
 766                                                    &b);
 767                         bits += b;
 768                     }
 769                     dists[w*16+g] = dist - bits;
 770                     if (prev != -1) {
 771                         bits += ff_aac_scalefactor_bits[sce->sf_idx[w*16+g] - prev + SCALE_DIFF_ZERO];
 772                     }
 773                     tbits += bits;
 774                     start += sce->ics.swb_sizes[g];
 775                     prev = sce->sf_idx[w*16+g];
 776                 }
 777             }
 778             if (tbits > destbits) {
 779                 for (i = 0; i < 128; i++)
 780                     if (sce->sf_idx[i] < 218 - qstep)
 781                         sce->sf_idx[i] += qstep;
 782             } else {
 783                 for (i = 0; i < 128; i++)
 784                     if (sce->sf_idx[i] > 60 - qstep)
 785                         sce->sf_idx[i] -= qstep;
 786             }
 787             qstep >>= 1;
 788             if (!qstep && tbits > destbits*1.02)
 789                 qstep = 1;
 790             if (sce->sf_idx[0] >= 217)
 791                 break;
 792         } while (qstep);
 793
 794         fflag = 0;
 795         minscaler = av_clip(minscaler, 60, 255 - SCALE_MAX_DIFF);
 796         for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 797             start = w*128;
 798             for (g = 0; g < sce->ics.num_swb; g++) {
 799                 int prevsc = sce->sf_idx[w*16+g];
 800                 const float *scaled = s->scoefs + start;
 801                 if (dists[w*16+g] > uplims[w*16+g] && sce->sf_idx[w*16+g] > 60)
 802                     sce->sf_idx[w*16+g]--;
 803                 sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], minscaler, minscaler + SCALE_MAX_DIFF);
 804                 sce->sf_idx[w*16+g] = FFMIN(sce->sf_idx[w*16+g], 219);
 805                 if (sce->sf_idx[w*16+g] != prevsc)
 806                     fflag = 1;
 807                 sce->band_type[w*16+g] = find_min_book(find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], scaled), sce->sf_idx[w*16+g]);
 808                 start += sce->ics.swb_sizes[g];
 809             }
 810         }
 811         its++;
 812     } while (fflag && its < 10);
 813 }
 814
 815 static void search_for_quantizers_faac(AVCodecContext *avctx, AACEncContext *s,
 816                                        SingleChannelElement *sce,
 817                                        const float lambda)
 818 {
 819     int start = 0, i, w, w2, g;
 820     float uplim[128], maxq[128];
 821     int minq, maxsf;
 822     float distfact = ((sce->ics.num_windows > 1) ? 85.80 : 147.84) / lambda;
 823     int last = 0, lastband = 0, curband = 0;
 824     float avg_energy = 0.0;
 825     if (sce->ics.num_windows == 1) {
 826         start = 0;
 827         for (i = 0; i < 1024; i++) {
 828             if (i - start >= sce->ics.swb_sizes[curband]) {
 829                 start += sce->ics.swb_sizes[curband];
 830                 curband++;
 831             }
 832             if (sce->coeffs[i]) {
 833                 avg_energy += sce->coeffs[i] * sce->coeffs[i];
 834                 last = i;
 835                 lastband = curband;
 836             }
 837         }
 838     } else {
 839         for (w = 0; w < 8; w++) {
 840             const float *coeffs = sce->coeffs + w*128;
 841             start = 0;
 842             for (i = 0; i < 128; i++) {
 843                 if (i - start >= sce->ics.swb_sizes[curband]) {
 844                     start += sce->ics.swb_sizes[curband];
 845                     curband++;
 846                 }
 847                 if (coeffs[i]) {
 848                     avg_energy += coeffs[i] * coeffs[i];
 849                     last = FFMAX(last, i);
 850                     lastband = FFMAX(lastband, curband);
 851                 }
 852             }
 853         }
 854     }
 855     last++;
 856     avg_energy /= last;
 857     if (avg_energy == 0.0f) {
 858         for (i = 0; i < FF_ARRAY_ELEMS(sce->sf_idx); i++)
 859             sce->sf_idx[i] = SCALE_ONE_POS;
 860         return;
 861     }
 862     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 863         start = w*128;
 864         for (g = 0; g < sce->ics.num_swb; g++) {
 865             float *coefs   = sce->coeffs + start;
 866             const int size = sce->ics.swb_sizes[g];
 867             int start2 = start, end2 = start + size, peakpos = start;
 868             float maxval = -1, thr = 0.0f, t;
 869             maxq[w*16+g] = 0.0f;
 870             if (g > lastband) {
 871                 maxq[w*16+g] = 0.0f;
 872                 start += size;
 873                 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++)
 874                     memset(coefs + w2*128, 0, sizeof(coefs[0])*size);
 875                 continue;
 876             }
 877             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 878                 for (i = 0; i < size; i++) {
 879                     float t = coefs[w2*128+i]*coefs[w2*128+i];
 880                     maxq[w*16+g] = FFMAX(maxq[w*16+g], fabsf(coefs[w2*128 + i]));
 881                     thr += t;
 882                     if (sce->ics.num_windows == 1 && maxval < t) {
 883                         maxval  = t;
 884                         peakpos = start+i;
 885                     }
 886                 }
 887             }
 888             if (sce->ics.num_windows == 1) {
 889                 start2 = FFMAX(peakpos - 2, start2);
 890                 end2   = FFMIN(peakpos + 3, end2);
 891             } else {
 892                 start2 -= start;
 893                 end2   -= start;
 894             }
 895             start += size;
 896             thr = pow(thr / (avg_energy * (end2 - start2)), 0.3 + 0.1*(lastband - g) / lastband);
 897             t   = 1.0 - (1.0 * start2 / last);
 898             uplim[w*16+g] = distfact / (1.4 * thr + t*t*t + 0.075);
 899         }
 900     }
 901     memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
 902     abs_pow34_v(s->scoefs, sce->coeffs, 1024);
 903     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 904         start = w*128;
 905         for (g = 0;  g < sce->ics.num_swb; g++) {
 906             const float *coefs  = sce->coeffs + start;
 907             const float *scaled = s->scoefs   + start;
 908             const int size      = sce->ics.swb_sizes[g];
 909             int scf, prev_scf, step;
 910             int min_scf = -1, max_scf = 256;
 911             float curdiff;
 912             if (maxq[w*16+g] < 21.544) {
 913                 sce->zeroes[w*16+g] = 1;
 914                 start += size;
 915                 continue;
 916             }
 917             sce->zeroes[w*16+g] = 0;
 918             scf  = prev_scf = av_clip(SCALE_ONE_POS - SCALE_DIV_512 - log2(1/maxq[w*16+g])*16/3, 60, 218);
 919             step = 16;
 920             for (;;) {
 921                 float dist = 0.0f;
 922                 int quant_max;
 923
 924                 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 925                     int b;
 926                     dist += quantize_band_cost(s, coefs + w2*128,
 927                                                scaled + w2*128,
 928                                                sce->ics.swb_sizes[g],
 929                                                scf,
 930                                                ESC_BT,
 931                                                lambda,
 932                                                INFINITY,
 933                                                &b);
 934                     dist -= b;
 935                 }
 936                 dist *= 1.0f / 512.0f / lambda;
 937                 quant_max = quant(maxq[w*16+g], ff_aac_pow2sf_tab[200 - scf + SCALE_ONE_POS - SCALE_DIV_512]);
 938                 if (quant_max >= 8191) { // too much, return to the previous quantizer
 939                     sce->sf_idx[w*16+g] = prev_scf;
 940                     break;
 941                 }
 942                 prev_scf = scf;
 943                 curdiff = fabsf(dist - uplim[w*16+g]);
 944                 if (curdiff <= 1.0f)
 945                     step = 0;
 946                 else
 947                     step = log2(curdiff);
 948                 if (dist > uplim[w*16+g])
 949                     step = -step;
 950                 scf += step;
 951                 scf = av_clip_uint8(scf);
 952                 step = scf - prev_scf;
 953                 if (FFABS(step) <= 1 || (step > 0 && scf >= max_scf) || (step < 0 && scf <= min_scf)) {
 954                     sce->sf_idx[w*16+g] = av_clip(scf, min_scf, max_scf);
 955                     break;
 956                 }
 957                 if (step > 0)
 958                     min_scf = prev_scf;
 959                 else
 960                     max_scf = prev_scf;
 961             }
 962             start += size;
 963         }
 964     }
 965     minq = sce->sf_idx[0] ? sce->sf_idx[0] : INT_MAX;
 966     for (i = 1; i < 128; i++) {
 967         if (!sce->sf_idx[i])
 968             sce->sf_idx[i] = sce->sf_idx[i-1];
 969         else
 970             minq = FFMIN(minq, sce->sf_idx[i]);
 971     }
 972     if (minq == INT_MAX)
 973         minq = 0;
 974     minq = FFMIN(minq, SCALE_MAX_POS);
 975     maxsf = FFMIN(minq + SCALE_MAX_DIFF, SCALE_MAX_POS);
 976     for (i = 126; i >= 0; i--) {
 977         if (!sce->sf_idx[i])
 978             sce->sf_idx[i] = sce->sf_idx[i+1];
 979         sce->sf_idx[i] = av_clip(sce->sf_idx[i], minq, maxsf);
 980     }
 981 }
 982
 983 static void search_for_quantizers_fast(AVCodecContext *avctx, AACEncContext *s,
 984                                        SingleChannelElement *sce,
 985                                        const float lambda)
 986 {
 987     int start = 0, i, w, w2, g;
 988     int minq = 255;
 989
 990     memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
 991     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 992         start = w*128;
 993         for (g = 0; g < sce->ics.num_swb; g++) {
 994             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 995                 FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
 996                 if (band->energy <= band->threshold) {
 997                     sce->sf_idx[(w+w2)*16+g] = 218;
 998                     sce->zeroes[(w+w2)*16+g] = 1;
 999                 } else {
1000                     sce->sf_idx[(w+w2)*16+g] = av_clip(SCALE_ONE_POS - SCALE_DIV_512 + log2(band->threshold), 80, 218);
1001                     sce->zeroes[(w+w2)*16+g] = 0;
1002                 }
1003                 minq = FFMIN(minq, sce->sf_idx[(w+w2)*16+g]);
1004             }
1005         }
1006     }
1007     for (i = 0; i < 128; i++) {
1008         sce->sf_idx[i] = 140;
1009         //av_clip(sce->sf_idx[i], minq, minq + SCALE_MAX_DIFF - 1);
1010     }
1011     //set the same quantizers inside window groups
1012     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
1013         for (g = 0;  g < sce->ics.num_swb; g++)
1014             for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)
1015                 sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
1016 }
1017
1018 static void search_for_ms(AACEncContext *s, ChannelElement *cpe,
1019                           const float lambda)
1020 {
1021     int start = 0, i, w, w2, g;
1022     float M[128], S[128];
1023     float *L34 = s->scoefs, *R34 = s->scoefs + 128, *M34 = s->scoefs + 128*2, *S34 = s->scoefs + 128*3;
1024     SingleChannelElement *sce0 = &cpe->ch[0];
1025     SingleChannelElement *sce1 = &cpe->ch[1];
1026     if (!cpe->common_window)
1027         return;
1028     for (w = 0; w < sce0->ics.num_windows; w += sce0->ics.group_len[w]) {
1029         for (g = 0;  g < sce0->ics.num_swb; g++) {
1030             if (!cpe->ch[0].zeroes[w*16+g] && !cpe->ch[1].zeroes[w*16+g]) {
1031                 float dist1 = 0.0f, dist2 = 0.0f;
1032                 for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {
1033                     FFPsyBand *band0 = &s->psy.psy_bands[(s->cur_channel+0)*PSY_MAX_BANDS+(w+w2)*16+g];
1034                     FFPsyBand *band1 = &s->psy.psy_bands[(s->cur_channel+1)*PSY_MAX_BANDS+(w+w2)*16+g];
1035                     float minthr = FFMIN(band0->threshold, band1->threshold);
1036                     float maxthr = FFMAX(band0->threshold, band1->threshold);
1037                     for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {
1038                         M[i] = (sce0->coeffs[start+w2*128+i]
1039                               + sce1->coeffs[start+w2*128+i]) * 0.5;
1040                         S[i] =  sce0->coeffs[start+w2*128+i]
1041                               - sce1->coeffs[start+w2*128+i];
1042                     }
1043                     abs_pow34_v(L34, sce0->coeffs+start+w2*128, sce0->ics.swb_sizes[g]);
1044                     abs_pow34_v(R34, sce1->coeffs+start+w2*128, sce0->ics.swb_sizes[g]);
1045                     abs_pow34_v(M34, M,                         sce0->ics.swb_sizes[g]);
1046                     abs_pow34_v(S34, S,                         sce0->ics.swb_sizes[g]);
1047                     dist1 += quantize_band_cost(s, sce0->coeffs + start + w2*128,
1048                                                 L34,
1049                                                 sce0->ics.swb_sizes[g],
1050                                                 sce0->sf_idx[(w+w2)*16+g],
1051                                                 sce0->band_type[(w+w2)*16+g],
1052                                                 lambda / band0->threshold, INFINITY, NULL);
1053                     dist1 += quantize_band_cost(s, sce1->coeffs + start + w2*128,
1054                                                 R34,
1055                                                 sce1->ics.swb_sizes[g],
1056                                                 sce1->sf_idx[(w+w2)*16+g],
1057                                                 sce1->band_type[(w+w2)*16+g],
1058                                                 lambda / band1->threshold, INFINITY, NULL);
1059                     dist2 += quantize_band_cost(s, M,
1060                                                 M34,
1061                                                 sce0->ics.swb_sizes[g],
1062                                                 sce0->sf_idx[(w+w2)*16+g],
1063                                                 sce0->band_type[(w+w2)*16+g],
1064                                                 lambda / maxthr, INFINITY, NULL);
1065                     dist2 += quantize_band_cost(s, S,
1066                                                 S34,
1067                                                 sce1->ics.swb_sizes[g],
1068                                                 sce1->sf_idx[(w+w2)*16+g],
1069                                                 sce1->band_type[(w+w2)*16+g],
1070                                                 lambda / minthr, INFINITY, NULL);
1071                 }
1072                 cpe->ms_mask[w*16+g] = dist2 < dist1;
1073             }
1074             start += sce0->ics.swb_sizes[g];
1075         }
1076     }
1077 }
1078
1079 AACCoefficientsEncoder ff_aac_coders[] = {
1080     {
1081         search_for_quantizers_faac,
1082         encode_window_bands_info,
1083         quantize_and_encode_band,
1084         search_for_ms,
1085     },
1086     {
1087         search_for_quantizers_anmr,
1088         encode_window_bands_info,
1089         quantize_and_encode_band,
1090         search_for_ms,
1091     },
1092     {
1093         search_for_quantizers_twoloop,
1094         codebook_trellis_rate,
1095         quantize_and_encode_band,
1096         search_for_ms,
1097     },
1098     {
1099         search_for_quantizers_fast,
1100         encode_window_bands_info,
1101         quantize_and_encode_band,
1102         search_for_ms,
1103     },
1104 };