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 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 "libavutil/libm.h" // brought forward to work around cygwin header breakage
  34
  35 #include <float.h>
  36 #include "avcodec.h"
  37 #include "put_bits.h"
  38 #include "aac.h"
  39 #include "aacenc.h"
  40 #include "aactab.h"
  41
  42 /** bits needed to code codebook run value for long windows */
  43 static const uint8_t run_value_bits_long[64] = {
  44      5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,
  45      5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5, 10,
  46     10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
  47     10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 15
  48 };
  49
  50 /** bits needed to code codebook run value for short windows */
  51 static const uint8_t run_value_bits_short[16] = {
  52     3, 3, 3, 3, 3, 3, 3, 6, 6, 6, 6, 6, 6, 6, 6, 9
  53 };
  54
  55 static const uint8_t *run_value_bits[2] = {
  56     run_value_bits_long, run_value_bits_short
  57 };
  58
  59
  60 /**
  61  * Quantize one coefficient.
  62  * @return absolute value of the quantized coefficient
  63  * @see 3GPP TS26.403 5.6.2 "Scalefactor determination"
  64  */
  65 static av_always_inline int quant(float coef, const float Q)
  66 {
  67     float a = coef * Q;
  68     return sqrtf(a * sqrtf(a)) + 0.4054;
  69 }
  70
  71 static void quantize_bands(int *out, const float *in, const float *scaled,
  72                            int size, float Q34, int is_signed, int maxval)
  73 {
  74     int i;
  75     double qc;
  76     for (i = 0; i < size; i++) {
  77         qc = scaled[i] * Q34;
  78         out[i] = (int)FFMIN(qc + 0.4054, (double)maxval);
  79         if (is_signed && in[i] < 0.0f) {
  80             out[i] = -out[i];
  81         }
  82     }
  83 }
  84
  85 static void abs_pow34_v(float *out, const float *in, const int size)
  86 {
  87 #ifndef USE_REALLY_FULL_SEARCH
  88     int i;
  89     for (i = 0; i < size; i++) {
  90         float a = fabsf(in[i]);
  91         out[i] = sqrtf(a * sqrtf(a));
  92     }
  93 #endif /* USE_REALLY_FULL_SEARCH */
  94 }
  95
  96 static const uint8_t aac_cb_range [12] = {0, 3, 3, 3, 3, 9, 9, 8, 8, 13, 13, 17};
  97 static const uint8_t aac_cb_maxval[12] = {0, 1, 1, 2, 2, 4, 4, 7, 7, 12, 12, 16};
  98
  99 /**
 100  * Calculate rate distortion cost for quantizing with given codebook
 101  *
 102  * @return quantization distortion
 103  */
 104 static av_always_inline float quantize_and_encode_band_cost_template(
 105                                 struct AACEncContext *s,
 106                                 PutBitContext *pb, const float *in,
 107                                 const float *scaled, int size, int scale_idx,
 108                                 int cb, const float lambda, const float uplim,
 109                                 int *bits, int BT_ZERO, int BT_UNSIGNED,
 110                                 int BT_PAIR, int BT_ESC)
 111 {
 112     const float IQ = ff_aac_pow2sf_tab[POW_SF2_ZERO + scale_idx - SCALE_ONE_POS + SCALE_DIV_512];
 113     const float  Q = ff_aac_pow2sf_tab[POW_SF2_ZERO - scale_idx + SCALE_ONE_POS - SCALE_DIV_512];
 114     const float CLIPPED_ESCAPE = 165140.0f*IQ;
 115     int i, j;
 116     float cost = 0;
 117     const int dim = BT_PAIR ? 2 : 4;
 118     int resbits = 0;
 119     const float  Q34 = sqrtf(Q * sqrtf(Q));
 120     const int range  = aac_cb_range[cb];
 121     const int maxval = aac_cb_maxval[cb];
 122     int off;
 123
 124     if (BT_ZERO) {
 125         for (i = 0; i < size; i++)
 126             cost += in[i]*in[i];
 127         if (bits)
 128             *bits = 0;
 129         return cost * lambda;
 130     }
 131     if (!scaled) {
 132         abs_pow34_v(s->scoefs, in, size);
 133         scaled = s->scoefs;
 134     }
 135     quantize_bands(s->qcoefs, in, scaled, size, Q34, !BT_UNSIGNED, maxval);
 136     if (BT_UNSIGNED) {
 137         off = 0;
 138     } else {
 139         off = maxval;
 140     }
 141     for (i = 0; i < size; i += dim) {
 142         const float *vec;
 143         int *quants = s->qcoefs + i;
 144         int curidx = 0;
 145         int curbits;
 146         float rd = 0.0f;
 147         for (j = 0; j < dim; j++) {
 148             curidx *= range;
 149             curidx += quants[j] + off;
 150         }
 151         curbits =  ff_aac_spectral_bits[cb-1][curidx];
 152         vec     = &ff_aac_codebook_vectors[cb-1][curidx*dim];
 153         if (BT_UNSIGNED) {
 154             for (j = 0; j < dim; j++) {
 155                 float t = fabsf(in[i+j]);
 156                 float di;
 157                 if (BT_ESC && vec[j] == 64.0f) { //FIXME: slow
 158                     if (t >= CLIPPED_ESCAPE) {
 159                         di = t - CLIPPED_ESCAPE;
 160                         curbits += 21;
 161                     } else {
 162                         int c = av_clip(quant(t, Q), 0, 8191);
 163                         di = t - c*cbrtf(c)*IQ;
 164                         curbits += av_log2(c)*2 - 4 + 1;
 165                     }
 166                 } else {
 167                     di = t - vec[j]*IQ;
 168                 }
 169                 if (vec[j] != 0.0f)
 170                     curbits++;
 171                 rd += di*di;
 172             }
 173         } else {
 174             for (j = 0; j < dim; j++) {
 175                 float di = in[i+j] - vec[j]*IQ;
 176                 rd += di*di;
 177             }
 178         }
 179         cost    += rd * lambda + curbits;
 180         resbits += curbits;
 181         if (cost >= uplim)
 182             return uplim;
 183         if (pb) {
 184             put_bits(pb, ff_aac_spectral_bits[cb-1][curidx], ff_aac_spectral_codes[cb-1][curidx]);
 185             if (BT_UNSIGNED)
 186                 for (j = 0; j < dim; j++)
 187                     if (ff_aac_codebook_vectors[cb-1][curidx*dim+j] != 0.0f)
 188                         put_bits(pb, 1, in[i+j] < 0.0f);
 189             if (BT_ESC) {
 190                 for (j = 0; j < 2; j++) {
 191                     if (ff_aac_codebook_vectors[cb-1][curidx*2+j] == 64.0f) {
 192                         int coef = av_clip(quant(fabsf(in[i+j]), Q), 0, 8191);
 193                         int len = av_log2(coef);
 194
 195                         put_bits(pb, len - 4 + 1, (1 << (len - 4 + 1)) - 2);
 196                         put_bits(pb, len, coef & ((1 << len) - 1));
 197                     }
 198                 }
 199             }
 200         }
 201     }
 202
 203     if (bits)
 204         *bits = resbits;
 205     return cost;
 206 }
 207
 208 #define QUANTIZE_AND_ENCODE_BAND_COST_FUNC(NAME, BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC) \
 209 static float quantize_and_encode_band_cost_ ## NAME(                                        \
 210                                 struct AACEncContext *s,                                \
 211                                 PutBitContext *pb, const float *in,                     \
 212                                 const float *scaled, int size, int scale_idx,           \
 213                                 int cb, const float lambda, const float uplim,          \
 214                                 int *bits) {                                            \
 215     return quantize_and_encode_band_cost_template(                                      \
 216                                 s, pb, in, scaled, size, scale_idx,                     \
 217                                 BT_ESC ? ESC_BT : cb, lambda, uplim, bits,              \
 218                                 BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC);                 \
 219 }
 220
 221 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ZERO,  1, 0, 0, 0)
 222 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(SQUAD, 0, 0, 0, 0)
 223 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(UQUAD, 0, 1, 0, 0)
 224 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(SPAIR, 0, 0, 1, 0)
 225 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(UPAIR, 0, 1, 1, 0)
 226 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ESC,   0, 1, 1, 1)
 227
 228 static float (*const quantize_and_encode_band_cost_arr[])(
 229                                 struct AACEncContext *s,
 230                                 PutBitContext *pb, const float *in,
 231                                 const float *scaled, int size, int scale_idx,
 232                                 int cb, const float lambda, const float uplim,
 233                                 int *bits) = {
 234     quantize_and_encode_band_cost_ZERO,
 235     quantize_and_encode_band_cost_SQUAD,
 236     quantize_and_encode_band_cost_SQUAD,
 237     quantize_and_encode_band_cost_UQUAD,
 238     quantize_and_encode_band_cost_UQUAD,
 239     quantize_and_encode_band_cost_SPAIR,
 240     quantize_and_encode_band_cost_SPAIR,
 241     quantize_and_encode_band_cost_UPAIR,
 242     quantize_and_encode_band_cost_UPAIR,
 243     quantize_and_encode_band_cost_UPAIR,
 244     quantize_and_encode_band_cost_UPAIR,
 245     quantize_and_encode_band_cost_ESC,
 246 };
 247
 248 #define quantize_and_encode_band_cost(                                  \
 249                                 s, pb, in, scaled, size, scale_idx, cb, \
 250                                 lambda, uplim, bits)                    \
 251     quantize_and_encode_band_cost_arr[cb](                              \
 252                                 s, pb, in, scaled, size, scale_idx, cb, \
 253                                 lambda, uplim, bits)
 254
 255 static float quantize_band_cost(struct AACEncContext *s, const float *in,
 256                                 const float *scaled, int size, int scale_idx,
 257                                 int cb, const float lambda, const float uplim,
 258                                 int *bits)
 259 {
 260     return quantize_and_encode_band_cost(s, NULL, in, scaled, size, scale_idx,
 261                                          cb, lambda, uplim, bits);
 262 }
 263
 264 static void quantize_and_encode_band(struct AACEncContext *s, PutBitContext *pb,
 265                                      const float *in, int size, int scale_idx,
 266                                      int cb, const float lambda)
 267 {
 268     quantize_and_encode_band_cost(s, pb, in, NULL, size, scale_idx, cb, lambda,
 269                                   INFINITY, NULL);
 270 }
 271
 272 static float find_max_val(int group_len, int swb_size, const float *scaled) {
 273     float maxval = 0.0f;
 274     int w2, i;
 275     for (w2 = 0; w2 < group_len; w2++) {
 276         for (i = 0; i < swb_size; i++) {
 277             maxval = FFMAX(maxval, scaled[w2*128+i]);
 278         }
 279     }
 280     return maxval;
 281 }
 282
 283 static int find_min_book(float maxval, int sf) {
 284     float Q = ff_aac_pow2sf_tab[POW_SF2_ZERO - sf + SCALE_ONE_POS - SCALE_DIV_512];
 285     float Q34 = sqrtf(Q * sqrtf(Q));
 286     int qmaxval, cb;
 287     qmaxval = maxval * Q34 + 0.4054f;
 288     if      (qmaxval ==  0) cb = 0;
 289     else if (qmaxval ==  1) cb = 1;
 290     else if (qmaxval ==  2) cb = 3;
 291     else if (qmaxval <=  4) cb = 5;
 292     else if (qmaxval <=  7) cb = 7;
 293     else if (qmaxval <= 12) cb = 9;
 294     else                    cb = 11;
 295     return cb;
 296 }
 297
 298 /**
 299  * structure used in optimal codebook search
 300  */
 301 typedef struct BandCodingPath {
 302     int prev_idx; ///< pointer to the previous path point
 303     float cost;   ///< path cost
 304     int run;
 305 } BandCodingPath;
 306
 307 /**
 308  * Encode band info for single window group bands.
 309  */
 310 static void encode_window_bands_info(AACEncContext *s, SingleChannelElement *sce,
 311                                      int win, int group_len, const float lambda)
 312 {
 313     BandCodingPath path[120][12];
 314     int w, swb, cb, start, start2, size;
 315     int i, j;
 316     const int max_sfb  = sce->ics.max_sfb;
 317     const int run_bits = sce->ics.num_windows == 1 ? 5 : 3;
 318     const int run_esc  = (1 << run_bits) - 1;
 319     int idx, ppos, count;
 320     int stackrun[120], stackcb[120], stack_len;
 321     float next_minrd = INFINITY;
 322     int next_mincb = 0;
 323
 324     abs_pow34_v(s->scoefs, sce->coeffs, 1024);
 325     start = win*128;
 326     for (cb = 0; cb < 12; cb++) {
 327         path[0][cb].cost     = 0.0f;
 328         path[0][cb].prev_idx = -1;
 329         path[0][cb].run      = 0;
 330     }
 331     for (swb = 0; swb < max_sfb; swb++) {
 332         start2 = start;
 333         size = sce->ics.swb_sizes[swb];
 334         if (sce->zeroes[win*16 + swb]) {
 335             for (cb = 0; cb < 12; cb++) {
 336                 path[swb+1][cb].prev_idx = cb;
 337                 path[swb+1][cb].cost     = path[swb][cb].cost;
 338                 path[swb+1][cb].run      = path[swb][cb].run + 1;
 339             }
 340         } else {
 341             float minrd = next_minrd;
 342             int mincb = next_mincb;
 343             next_minrd = INFINITY;
 344             next_mincb = 0;
 345             for (cb = 0; cb < 12; cb++) {
 346                 float cost_stay_here, cost_get_here;
 347                 float rd = 0.0f;
 348                 for (w = 0; w < group_len; w++) {
 349                     FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(win+w)*16+swb];
 350                     rd += quantize_band_cost(s, sce->coeffs + start + w*128,
 351                                              s->scoefs + start + w*128, size,
 352                                              sce->sf_idx[(win+w)*16+swb], cb,
 353                                              lambda / band->threshold, INFINITY, NULL);
 354                 }
 355                 cost_stay_here = path[swb][cb].cost + rd;
 356                 cost_get_here  = minrd              + rd + run_bits + 4;
 357                 if (   run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run]
 358                     != run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run+1])
 359                     cost_stay_here += run_bits;
 360                 if (cost_get_here < cost_stay_here) {
 361                     path[swb+1][cb].prev_idx = mincb;
 362                     path[swb+1][cb].cost     = cost_get_here;
 363                     path[swb+1][cb].run      = 1;
 364                 } else {
 365                     path[swb+1][cb].prev_idx = cb;
 366                     path[swb+1][cb].cost     = cost_stay_here;
 367                     path[swb+1][cb].run      = path[swb][cb].run + 1;
 368                 }
 369                 if (path[swb+1][cb].cost < next_minrd) {
 370                     next_minrd = path[swb+1][cb].cost;
 371                     next_mincb = cb;
 372                 }
 373             }
 374         }
 375         start += sce->ics.swb_sizes[swb];
 376     }
 377
 378     //convert resulting path from backward-linked list
 379     stack_len = 0;
 380     idx       = 0;
 381     for (cb = 1; cb < 12; cb++)
 382         if (path[max_sfb][cb].cost < path[max_sfb][idx].cost)
 383             idx = cb;
 384     ppos = max_sfb;
 385     while (ppos > 0) {
 386         cb = idx;
 387         stackrun[stack_len] = path[ppos][cb].run;
 388         stackcb [stack_len] = cb;
 389         idx = path[ppos-path[ppos][cb].run+1][cb].prev_idx;
 390         ppos -= path[ppos][cb].run;
 391         stack_len++;
 392     }
 393     //perform actual band info encoding
 394     start = 0;
 395     for (i = stack_len - 1; i >= 0; i--) {
 396         put_bits(&s->pb, 4, stackcb[i]);
 397         count = stackrun[i];
 398         memset(sce->zeroes + win*16 + start, !stackcb[i], count);
 399         //XXX: memset when band_type is also uint8_t
 400         for (j = 0; j < count; j++) {
 401             sce->band_type[win*16 + start] =  stackcb[i];
 402             start++;
 403         }
 404         while (count >= run_esc) {
 405             put_bits(&s->pb, run_bits, run_esc);
 406             count -= run_esc;
 407         }
 408         put_bits(&s->pb, run_bits, count);
 409     }
 410 }
 411
 412 static void codebook_trellis_rate(AACEncContext *s, SingleChannelElement *sce,
 413                                   int win, int group_len, const float lambda)
 414 {
 415     BandCodingPath path[120][12];
 416     int w, swb, cb, start, start2, size;
 417     int i, j;
 418     const int max_sfb  = sce->ics.max_sfb;
 419     const int run_bits = sce->ics.num_windows == 1 ? 5 : 3;
 420     const int run_esc  = (1 << run_bits) - 1;
 421     int idx, ppos, count;
 422     int stackrun[120], stackcb[120], stack_len;
 423     float next_minrd = INFINITY;
 424     int next_mincb = 0;
 425
 426     abs_pow34_v(s->scoefs, sce->coeffs, 1024);
 427     start = win*128;
 428     for (cb = 0; cb < 12; cb++) {
 429         path[0][cb].cost     = run_bits+4;
 430         path[0][cb].prev_idx = -1;
 431         path[0][cb].run      = 0;
 432     }
 433     for (swb = 0; swb < max_sfb; swb++) {
 434         start2 = start;
 435         size = sce->ics.swb_sizes[swb];
 436         if (sce->zeroes[win*16 + swb]) {
 437             for (cb = 0; cb < 12; cb++) {
 438                 path[swb+1][cb].prev_idx = cb;
 439                 path[swb+1][cb].cost     = path[swb][cb].cost;
 440                 path[swb+1][cb].run      = path[swb][cb].run + 1;
 441             }
 442         } else {
 443             float minrd = next_minrd;
 444             int mincb = next_mincb;
 445             int startcb = sce->band_type[win*16+swb];
 446             next_minrd = INFINITY;
 447             next_mincb = 0;
 448             for (cb = 0; cb < startcb; cb++) {
 449                 path[swb+1][cb].cost = 61450;
 450                 path[swb+1][cb].prev_idx = -1;
 451                 path[swb+1][cb].run = 0;
 452             }
 453             for (cb = startcb; cb < 12; cb++) {
 454                 float cost_stay_here, cost_get_here;
 455                 float rd = 0.0f;
 456                 for (w = 0; w < group_len; w++) {
 457                     rd += quantize_band_cost(s, sce->coeffs + start + w*128,
 458                                              s->scoefs + start + w*128, size,
 459                                              sce->sf_idx[(win+w)*16+swb], cb,
 460                                              0, INFINITY, NULL);
 461                 }
 462                 cost_stay_here = path[swb][cb].cost + rd;
 463                 cost_get_here  = minrd              + rd + run_bits + 4;
 464                 if (   run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run]
 465                     != run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run+1])
 466                     cost_stay_here += run_bits;
 467                 if (cost_get_here < cost_stay_here) {
 468                     path[swb+1][cb].prev_idx = mincb;
 469                     path[swb+1][cb].cost     = cost_get_here;
 470                     path[swb+1][cb].run      = 1;
 471                 } else {
 472                     path[swb+1][cb].prev_idx = cb;
 473                     path[swb+1][cb].cost     = cost_stay_here;
 474                     path[swb+1][cb].run      = path[swb][cb].run + 1;
 475                 }
 476                 if (path[swb+1][cb].cost < next_minrd) {
 477                     next_minrd = path[swb+1][cb].cost;
 478                     next_mincb = cb;
 479                 }
 480             }
 481         }
 482         start += sce->ics.swb_sizes[swb];
 483     }
 484
 485     //convert resulting path from backward-linked list
 486     stack_len = 0;
 487     idx       = 0;
 488     for (cb = 1; cb < 12; cb++)
 489         if (path[max_sfb][cb].cost < path[max_sfb][idx].cost)
 490             idx = cb;
 491     ppos = max_sfb;
 492     while (ppos > 0) {
 493         assert(idx >= 0);
 494         cb = idx;
 495         stackrun[stack_len] = path[ppos][cb].run;
 496         stackcb [stack_len] = cb;
 497         idx = path[ppos-path[ppos][cb].run+1][cb].prev_idx;
 498         ppos -= path[ppos][cb].run;
 499         stack_len++;
 500     }
 501     //perform actual band info encoding
 502     start = 0;
 503     for (i = stack_len - 1; i >= 0; i--) {
 504         put_bits(&s->pb, 4, stackcb[i]);
 505         count = stackrun[i];
 506         memset(sce->zeroes + win*16 + start, !stackcb[i], count);
 507         //XXX: memset when band_type is also uint8_t
 508         for (j = 0; j < count; j++) {
 509             sce->band_type[win*16 + start] =  stackcb[i];
 510             start++;
 511         }
 512         while (count >= run_esc) {
 513             put_bits(&s->pb, run_bits, run_esc);
 514             count -= run_esc;
 515         }
 516         put_bits(&s->pb, run_bits, count);
 517     }
 518 }
 519
 520 /** Return the minimum scalefactor where the quantized coef does not clip. */
 521 static av_always_inline uint8_t coef2minsf(float coef) {
 522     return av_clip_uint8(log2f(coef)*4 - 69 + SCALE_ONE_POS - SCALE_DIV_512);
 523 }
 524
 525 /** Return the maximum scalefactor where the quantized coef is not zero. */
 526 static av_always_inline uint8_t coef2maxsf(float coef) {
 527     return av_clip_uint8(log2f(coef)*4 +  6 + SCALE_ONE_POS - SCALE_DIV_512);
 528 }
 529
 530 typedef struct TrellisPath {
 531     float cost;
 532     int prev;
 533 } TrellisPath;
 534
 535 #define TRELLIS_STAGES 121
 536 #define TRELLIS_STATES (SCALE_MAX_DIFF+1)
 537
 538 static void search_for_quantizers_anmr(AVCodecContext *avctx, AACEncContext *s,
 539                                        SingleChannelElement *sce,
 540                                        const float lambda)
 541 {
 542     int q, w, w2, g, start = 0;
 543     int i, j;
 544     int idx;
 545     TrellisPath paths[TRELLIS_STAGES][TRELLIS_STATES];
 546     int bandaddr[TRELLIS_STAGES];
 547     int minq;
 548     float mincost;
 549     float q0f = FLT_MAX, q1f = 0.0f, qnrgf = 0.0f;
 550     int q0, q1, qcnt = 0;
 551
 552     for (i = 0; i < 1024; i++) {
 553         float t = fabsf(sce->coeffs[i]);
 554         if (t > 0.0f) {
 555             q0f = FFMIN(q0f, t);
 556             q1f = FFMAX(q1f, t);
 557             qnrgf += t*t;
 558             qcnt++;
 559         }
 560     }
 561
 562     if (!qcnt) {
 563         memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
 564         memset(sce->zeroes, 1, sizeof(sce->zeroes));
 565         return;
 566     }
 567
 568     //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
 569     q0 = coef2minsf(q0f);
 570     //maximum scalefactor index is when maximum coefficient after quantizing is still not zero
 571     q1 = coef2maxsf(q1f);
 572     //av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1);
 573     if (q1 - q0 > 60) {
 574         int q0low  = q0;
 575         int q1high = q1;
 576         //minimum scalefactor index is when maximum nonzero coefficient after quantizing is not clipped
 577         int qnrg = av_clip_uint8(log2f(sqrtf(qnrgf/qcnt))*4 - 31 + SCALE_ONE_POS - SCALE_DIV_512);
 578         q1 = qnrg + 30;
 579         q0 = qnrg - 30;
 580         //av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1);
 581         if (q0 < q0low) {
 582             q1 += q0low - q0;
 583             q0  = q0low;
 584         } else if (q1 > q1high) {
 585             q0 -= q1 - q1high;
 586             q1  = q1high;
 587         }
 588     }
 589     //av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1);
 590
 591     for (i = 0; i < TRELLIS_STATES; i++) {
 592         paths[0][i].cost    = 0.0f;
 593         paths[0][i].prev    = -1;
 594     }
 595     for (j = 1; j < TRELLIS_STAGES; j++) {
 596         for (i = 0; i < TRELLIS_STATES; i++) {
 597             paths[j][i].cost    = INFINITY;
 598             paths[j][i].prev    = -2;
 599         }
 600     }
 601     idx = 1;
 602     abs_pow34_v(s->scoefs, sce->coeffs, 1024);
 603     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 604         start = w*128;
 605         for (g = 0; g < sce->ics.num_swb; g++) {
 606             const float *coefs = sce->coeffs + start;
 607             float qmin, qmax;
 608             int nz = 0;
 609
 610             bandaddr[idx] = w * 16 + g;
 611             qmin = INT_MAX;
 612             qmax = 0.0f;
 613             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 614                 FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
 615                 if (band->energy <= band->threshold || band->threshold == 0.0f) {
 616                     sce->zeroes[(w+w2)*16+g] = 1;
 617                     continue;
 618                 }
 619                 sce->zeroes[(w+w2)*16+g] = 0;
 620                 nz = 1;
 621                 for (i = 0; i < sce->ics.swb_sizes[g]; i++) {
 622                     float t = fabsf(coefs[w2*128+i]);
 623                     if (t > 0.0f)
 624                         qmin = FFMIN(qmin, t);
 625                     qmax = FFMAX(qmax, t);
 626                 }
 627             }
 628             if (nz) {
 629                 int minscale, maxscale;
 630                 float minrd = INFINITY;
 631                 float maxval;
 632                 //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
 633                 minscale = coef2minsf(qmin);
 634                 //maximum scalefactor index is when maximum coefficient after quantizing is still not zero
 635                 maxscale = coef2maxsf(qmax);
 636                 minscale = av_clip(minscale - q0, 0, TRELLIS_STATES - 1);
 637                 maxscale = av_clip(maxscale - q0, 0, TRELLIS_STATES);
 638                 maxval = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], s->scoefs+start);
 639                 for (q = minscale; q < maxscale; q++) {
 640                     float dist = 0;
 641                     int cb = find_min_book(maxval, sce->sf_idx[w*16+g]);
 642                     for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 643                         FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
 644                         dist += quantize_band_cost(s, coefs + w2*128, s->scoefs + start + w2*128, sce->ics.swb_sizes[g],
 645                                                    q + q0, cb, lambda / band->threshold, INFINITY, NULL);
 646                     }
 647                     minrd = FFMIN(minrd, dist);
 648
 649                     for (i = 0; i < q1 - q0; i++) {
 650                         float cost;
 651                         cost = paths[idx - 1][i].cost + dist
 652                                + ff_aac_scalefactor_bits[q - i + SCALE_DIFF_ZERO];
 653                         if (cost < paths[idx][q].cost) {
 654                             paths[idx][q].cost    = cost;
 655                             paths[idx][q].prev    = i;
 656                         }
 657                     }
 658                 }
 659             } else {
 660                 for (q = 0; q < q1 - q0; q++) {
 661                     paths[idx][q].cost = paths[idx - 1][q].cost + 1;
 662                     paths[idx][q].prev = q;
 663                 }
 664             }
 665             sce->zeroes[w*16+g] = !nz;
 666             start += sce->ics.swb_sizes[g];
 667             idx++;
 668         }
 669     }
 670     idx--;
 671     mincost = paths[idx][0].cost;
 672     minq    = 0;
 673     for (i = 1; i < TRELLIS_STATES; i++) {
 674         if (paths[idx][i].cost < mincost) {
 675             mincost = paths[idx][i].cost;
 676             minq = i;
 677         }
 678     }
 679     while (idx) {
 680         sce->sf_idx[bandaddr[idx]] = minq + q0;
 681         minq = paths[idx][minq].prev;
 682         idx--;
 683     }
 684     //set the same quantizers inside window groups
 685     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
 686         for (g = 0;  g < sce->ics.num_swb; g++)
 687             for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)
 688                 sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
 689 }
 690
 691 /**
 692  * two-loop quantizers search taken from ISO 13818-7 Appendix C
 693  */
 694 static void search_for_quantizers_twoloop(AVCodecContext *avctx,
 695                                           AACEncContext *s,
 696                                           SingleChannelElement *sce,
 697                                           const float lambda)
 698 {
 699     int start = 0, i, w, w2, g;
 700     int destbits = avctx->bit_rate * 1024.0 / avctx->sample_rate / avctx->channels;
 701     float dists[128], uplims[128];
 702     float maxvals[128];
 703     int fflag, minscaler;
 704     int its  = 0;
 705     int allz = 0;
 706     float minthr = INFINITY;
 707
 708     //XXX: some heuristic to determine initial quantizers will reduce search time
 709     memset(dists, 0, sizeof(dists));
 710     //determine zero bands and upper limits
 711     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 712         for (g = 0;  g < sce->ics.num_swb; g++) {
 713             int nz = 0;
 714             float uplim = 0.0f;
 715             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 716                 FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
 717                 uplim += band->threshold;
 718                 if (band->energy <= band->threshold || band->threshold == 0.0f) {
 719                     sce->zeroes[(w+w2)*16+g] = 1;
 720                     continue;
 721                 }
 722                 nz = 1;
 723             }
 724             uplims[w*16+g] = uplim *512;
 725             sce->zeroes[w*16+g] = !nz;
 726             if (nz)
 727                 minthr = FFMIN(minthr, uplim);
 728             allz |= nz;
 729         }
 730     }
 731     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 732         for (g = 0;  g < sce->ics.num_swb; g++) {
 733             if (sce->zeroes[w*16+g]) {
 734                 sce->sf_idx[w*16+g] = SCALE_ONE_POS;
 735                 continue;
 736             }
 737             sce->sf_idx[w*16+g] = SCALE_ONE_POS + FFMIN(log2f(uplims[w*16+g]/minthr)*4,59);
 738         }
 739     }
 740
 741     if (!allz)
 742         return;
 743     abs_pow34_v(s->scoefs, sce->coeffs, 1024);
 744
 745     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 746         start = w*128;
 747         for (g = 0;  g < sce->ics.num_swb; g++) {
 748             const float *scaled = s->scoefs + start;
 749             maxvals[w*16+g] = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], scaled);
 750             start += sce->ics.swb_sizes[g];
 751         }
 752     }
 753
 754     //perform two-loop search
 755     //outer loop - improve quality
 756     do {
 757         int tbits, qstep;
 758         minscaler = sce->sf_idx[0];
 759         //inner loop - quantize spectrum to fit into given number of bits
 760         qstep = its ? 1 : 32;
 761         do {
 762             int prev = -1;
 763             tbits = 0;
 764             fflag = 0;
 765             for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 766                 start = w*128;
 767                 for (g = 0;  g < sce->ics.num_swb; g++) {
 768                     const float *coefs = sce->coeffs + start;
 769                     const float *scaled = s->scoefs + start;
 770                     int bits = 0;
 771                     int cb;
 772                     float dist = 0.0f;
 773
 774                     if (sce->zeroes[w*16+g] || sce->sf_idx[w*16+g] >= 218) {
 775                         start += sce->ics.swb_sizes[g];
 776                         continue;
 777                     }
 778                     minscaler = FFMIN(minscaler, sce->sf_idx[w*16+g]);
 779                     cb = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]);
 780                     for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 781                         int b;
 782                         dist += quantize_band_cost(s, coefs + w2*128,
 783                                                    scaled + w2*128,
 784                                                    sce->ics.swb_sizes[g],
 785                                                    sce->sf_idx[w*16+g],
 786                                                    cb,
 787                                                    1.0f,
 788                                                    INFINITY,
 789                                                    &b);
 790                         bits += b;
 791                     }
 792                     dists[w*16+g] = dist - bits;
 793                     if (prev != -1) {
 794                         bits += ff_aac_scalefactor_bits[sce->sf_idx[w*16+g] - prev + SCALE_DIFF_ZERO];
 795                     }
 796                     tbits += bits;
 797                     start += sce->ics.swb_sizes[g];
 798                     prev = sce->sf_idx[w*16+g];
 799                 }
 800             }
 801             if (tbits > destbits) {
 802                 for (i = 0; i < 128; i++)
 803                     if (sce->sf_idx[i] < 218 - qstep)
 804                         sce->sf_idx[i] += qstep;
 805             } else {
 806                 for (i = 0; i < 128; i++)
 807                     if (sce->sf_idx[i] > 60 - qstep)
 808                         sce->sf_idx[i] -= qstep;
 809             }
 810             qstep >>= 1;
 811             if (!qstep && tbits > destbits*1.02 && sce->sf_idx[0] < 217)
 812                 qstep = 1;
 813         } while (qstep);
 814
 815         fflag = 0;
 816         minscaler = av_clip(minscaler, 60, 255 - SCALE_MAX_DIFF);
 817         for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 818             for (g = 0; g < sce->ics.num_swb; g++) {
 819                 int prevsc = sce->sf_idx[w*16+g];
 820                 if (dists[w*16+g] > uplims[w*16+g] && sce->sf_idx[w*16+g] > 60) {
 821                     if (find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]-1))
 822                         sce->sf_idx[w*16+g]--;
 823                     else //Try to make sure there is some energy in every band
 824                         sce->sf_idx[w*16+g]-=2;
 825                 }
 826                 sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], minscaler, minscaler + SCALE_MAX_DIFF);
 827                 sce->sf_idx[w*16+g] = FFMIN(sce->sf_idx[w*16+g], 219);
 828                 if (sce->sf_idx[w*16+g] != prevsc)
 829                     fflag = 1;
 830                 sce->band_type[w*16+g] = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]);
 831             }
 832         }
 833         its++;
 834     } while (fflag && its < 10);
 835 }
 836
 837 static void search_for_quantizers_faac(AVCodecContext *avctx, AACEncContext *s,
 838                                        SingleChannelElement *sce,
 839                                        const float lambda)
 840 {
 841     int start = 0, i, w, w2, g;
 842     float uplim[128], maxq[128];
 843     int minq, maxsf;
 844     float distfact = ((sce->ics.num_windows > 1) ? 85.80 : 147.84) / lambda;
 845     int last = 0, lastband = 0, curband = 0;
 846     float avg_energy = 0.0;
 847     if (sce->ics.num_windows == 1) {
 848         start = 0;
 849         for (i = 0; i < 1024; i++) {
 850             if (i - start >= sce->ics.swb_sizes[curband]) {
 851                 start += sce->ics.swb_sizes[curband];
 852                 curband++;
 853             }
 854             if (sce->coeffs[i]) {
 855                 avg_energy += sce->coeffs[i] * sce->coeffs[i];
 856                 last = i;
 857                 lastband = curband;
 858             }
 859         }
 860     } else {
 861         for (w = 0; w < 8; w++) {
 862             const float *coeffs = sce->coeffs + w*128;
 863             start = 0;
 864             for (i = 0; i < 128; i++) {
 865                 if (i - start >= sce->ics.swb_sizes[curband]) {
 866                     start += sce->ics.swb_sizes[curband];
 867                     curband++;
 868                 }
 869                 if (coeffs[i]) {
 870                     avg_energy += coeffs[i] * coeffs[i];
 871                     last = FFMAX(last, i);
 872                     lastband = FFMAX(lastband, curband);
 873                 }
 874             }
 875         }
 876     }
 877     last++;
 878     avg_energy /= last;
 879     if (avg_energy == 0.0f) {
 880         for (i = 0; i < FF_ARRAY_ELEMS(sce->sf_idx); i++)
 881             sce->sf_idx[i] = SCALE_ONE_POS;
 882         return;
 883     }
 884     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 885         start = w*128;
 886         for (g = 0; g < sce->ics.num_swb; g++) {
 887             float *coefs   = sce->coeffs + start;
 888             const int size = sce->ics.swb_sizes[g];
 889             int start2 = start, end2 = start + size, peakpos = start;
 890             float maxval = -1, thr = 0.0f, t;
 891             maxq[w*16+g] = 0.0f;
 892             if (g > lastband) {
 893                 maxq[w*16+g] = 0.0f;
 894                 start += size;
 895                 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++)
 896                     memset(coefs + w2*128, 0, sizeof(coefs[0])*size);
 897                 continue;
 898             }
 899             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 900                 for (i = 0; i < size; i++) {
 901                     float t = coefs[w2*128+i]*coefs[w2*128+i];
 902                     maxq[w*16+g] = FFMAX(maxq[w*16+g], fabsf(coefs[w2*128 + i]));
 903                     thr += t;
 904                     if (sce->ics.num_windows == 1 && maxval < t) {
 905                         maxval  = t;
 906                         peakpos = start+i;
 907                     }
 908                 }
 909             }
 910             if (sce->ics.num_windows == 1) {
 911                 start2 = FFMAX(peakpos - 2, start2);
 912                 end2   = FFMIN(peakpos + 3, end2);
 913             } else {
 914                 start2 -= start;
 915                 end2   -= start;
 916             }
 917             start += size;
 918             thr = pow(thr / (avg_energy * (end2 - start2)), 0.3 + 0.1*(lastband - g) / lastband);
 919             t   = 1.0 - (1.0 * start2 / last);
 920             uplim[w*16+g] = distfact / (1.4 * thr + t*t*t + 0.075);
 921         }
 922     }
 923     memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
 924     abs_pow34_v(s->scoefs, sce->coeffs, 1024);
 925     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 926         start = w*128;
 927         for (g = 0;  g < sce->ics.num_swb; g++) {
 928             const float *coefs  = sce->coeffs + start;
 929             const float *scaled = s->scoefs   + start;
 930             const int size      = sce->ics.swb_sizes[g];
 931             int scf, prev_scf, step;
 932             int min_scf = -1, max_scf = 256;
 933             float curdiff;
 934             if (maxq[w*16+g] < 21.544) {
 935                 sce->zeroes[w*16+g] = 1;
 936                 start += size;
 937                 continue;
 938             }
 939             sce->zeroes[w*16+g] = 0;
 940             scf  = prev_scf = av_clip(SCALE_ONE_POS - SCALE_DIV_512 - log2f(1/maxq[w*16+g])*16/3, 60, 218);
 941             step = 16;
 942             for (;;) {
 943                 float dist = 0.0f;
 944                 int quant_max;
 945
 946                 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 947                     int b;
 948                     dist += quantize_band_cost(s, coefs + w2*128,
 949                                                scaled + w2*128,
 950                                                sce->ics.swb_sizes[g],
 951                                                scf,
 952                                                ESC_BT,
 953                                                lambda,
 954                                                INFINITY,
 955                                                &b);
 956                     dist -= b;
 957                 }
 958                 dist *= 1.0f / 512.0f / lambda;
 959                 quant_max = quant(maxq[w*16+g], ff_aac_pow2sf_tab[POW_SF2_ZERO - scf + SCALE_ONE_POS - SCALE_DIV_512]);
 960                 if (quant_max >= 8191) { // too much, return to the previous quantizer
 961                     sce->sf_idx[w*16+g] = prev_scf;
 962                     break;
 963                 }
 964                 prev_scf = scf;
 965                 curdiff = fabsf(dist - uplim[w*16+g]);
 966                 if (curdiff <= 1.0f)
 967                     step = 0;
 968                 else
 969                     step = log2f(curdiff);
 970                 if (dist > uplim[w*16+g])
 971                     step = -step;
 972                 scf += step;
 973                 scf = av_clip_uint8(scf);
 974                 step = scf - prev_scf;
 975                 if (FFABS(step) <= 1 || (step > 0 && scf >= max_scf) || (step < 0 && scf <= min_scf)) {
 976                     sce->sf_idx[w*16+g] = av_clip(scf, min_scf, max_scf);
 977                     break;
 978                 }
 979                 if (step > 0)
 980                     min_scf = prev_scf;
 981                 else
 982                     max_scf = prev_scf;
 983             }
 984             start += size;
 985         }
 986     }
 987     minq = sce->sf_idx[0] ? sce->sf_idx[0] : INT_MAX;
 988     for (i = 1; i < 128; i++) {
 989         if (!sce->sf_idx[i])
 990             sce->sf_idx[i] = sce->sf_idx[i-1];
 991         else
 992             minq = FFMIN(minq, sce->sf_idx[i]);
 993     }
 994     if (minq == INT_MAX)
 995         minq = 0;
 996     minq = FFMIN(minq, SCALE_MAX_POS);
 997     maxsf = FFMIN(minq + SCALE_MAX_DIFF, SCALE_MAX_POS);
 998     for (i = 126; i >= 0; i--) {
 999         if (!sce->sf_idx[i])
1000             sce->sf_idx[i] = sce->sf_idx[i+1];
1001         sce->sf_idx[i] = av_clip(sce->sf_idx[i], minq, maxsf);
1002     }
1003 }
1004
1005 static void search_for_quantizers_fast(AVCodecContext *avctx, AACEncContext *s,
1006                                        SingleChannelElement *sce,
1007                                        const float lambda)
1008 {
1009     int start = 0, i, w, w2, g;
1010     int minq = 255;
1011
1012     memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
1013     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
1014         start = w*128;
1015         for (g = 0; g < sce->ics.num_swb; g++) {
1016             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
1017                 FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
1018                 if (band->energy <= band->threshold) {
1019                     sce->sf_idx[(w+w2)*16+g] = 218;
1020                     sce->zeroes[(w+w2)*16+g] = 1;
1021                 } else {
1022                     sce->sf_idx[(w+w2)*16+g] = av_clip(SCALE_ONE_POS - SCALE_DIV_512 + log2f(band->threshold), 80, 218);
1023                     sce->zeroes[(w+w2)*16+g] = 0;
1024                 }
1025                 minq = FFMIN(minq, sce->sf_idx[(w+w2)*16+g]);
1026             }
1027         }
1028     }
1029     for (i = 0; i < 128; i++) {
1030         sce->sf_idx[i] = 140;
1031         //av_clip(sce->sf_idx[i], minq, minq + SCALE_MAX_DIFF - 1);
1032     }
1033     //set the same quantizers inside window groups
1034     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
1035         for (g = 0;  g < sce->ics.num_swb; g++)
1036             for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)
1037                 sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
1038 }
1039
1040 static void search_for_ms(AACEncContext *s, ChannelElement *cpe,
1041                           const float lambda)
1042 {
1043     int start = 0, i, w, w2, g;
1044     float M[128], S[128];
1045     float *L34 = s->scoefs, *R34 = s->scoefs + 128, *M34 = s->scoefs + 128*2, *S34 = s->scoefs + 128*3;
1046     SingleChannelElement *sce0 = &cpe->ch[0];
1047     SingleChannelElement *sce1 = &cpe->ch[1];
1048     if (!cpe->common_window)
1049         return;
1050     for (w = 0; w < sce0->ics.num_windows; w += sce0->ics.group_len[w]) {
1051         for (g = 0;  g < sce0->ics.num_swb; g++) {
1052             if (!cpe->ch[0].zeroes[w*16+g] && !cpe->ch[1].zeroes[w*16+g]) {
1053                 float dist1 = 0.0f, dist2 = 0.0f;
1054                 for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {
1055                     FFPsyBand *band0 = &s->psy.psy_bands[(s->cur_channel+0)*PSY_MAX_BANDS+(w+w2)*16+g];
1056                     FFPsyBand *band1 = &s->psy.psy_bands[(s->cur_channel+1)*PSY_MAX_BANDS+(w+w2)*16+g];
1057                     float minthr = FFMIN(band0->threshold, band1->threshold);
1058                     float maxthr = FFMAX(band0->threshold, band1->threshold);
1059                     for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {
1060                         M[i] = (sce0->coeffs[start+w2*128+i]
1061                               + sce1->coeffs[start+w2*128+i]) * 0.5;
1062                         S[i] =  M[i]
1063                               - sce1->coeffs[start+w2*128+i];
1064                     }
1065                     abs_pow34_v(L34, sce0->coeffs+start+w2*128, sce0->ics.swb_sizes[g]);
1066                     abs_pow34_v(R34, sce1->coeffs+start+w2*128, sce0->ics.swb_sizes[g]);
1067                     abs_pow34_v(M34, M,                         sce0->ics.swb_sizes[g]);
1068                     abs_pow34_v(S34, S,                         sce0->ics.swb_sizes[g]);
1069                     dist1 += quantize_band_cost(s, sce0->coeffs + start + w2*128,
1070                                                 L34,
1071                                                 sce0->ics.swb_sizes[g],
1072                                                 sce0->sf_idx[(w+w2)*16+g],
1073                                                 sce0->band_type[(w+w2)*16+g],
1074                                                 lambda / band0->threshold, INFINITY, NULL);
1075                     dist1 += quantize_band_cost(s, sce1->coeffs + start + w2*128,
1076                                                 R34,
1077                                                 sce1->ics.swb_sizes[g],
1078                                                 sce1->sf_idx[(w+w2)*16+g],
1079                                                 sce1->band_type[(w+w2)*16+g],
1080                                                 lambda / band1->threshold, INFINITY, NULL);
1081                     dist2 += quantize_band_cost(s, M,
1082                                                 M34,
1083                                                 sce0->ics.swb_sizes[g],
1084                                                 sce0->sf_idx[(w+w2)*16+g],
1085                                                 sce0->band_type[(w+w2)*16+g],
1086                                                 lambda / maxthr, INFINITY, NULL);
1087                     dist2 += quantize_band_cost(s, S,
1088                                                 S34,
1089                                                 sce1->ics.swb_sizes[g],
1090                                                 sce1->sf_idx[(w+w2)*16+g],
1091                                                 sce1->band_type[(w+w2)*16+g],
1092                                                 lambda / minthr, INFINITY, NULL);
1093                 }
1094                 cpe->ms_mask[w*16+g] = dist2 < dist1;
1095             }
1096             start += sce0->ics.swb_sizes[g];
1097         }
1098     }
1099 }
1100
1101 AACCoefficientsEncoder ff_aac_coders[] = {
1102     {
1103         search_for_quantizers_faac,
1104         encode_window_bands_info,
1105         quantize_and_encode_band,
1106         search_for_ms,
1107     },
1108     {
1109         search_for_quantizers_anmr,
1110         encode_window_bands_info,
1111         quantize_and_encode_band,
1112         search_for_ms,
1113     },
1114     {
1115         search_for_quantizers_twoloop,
1116         codebook_trellis_rate,
1117         quantize_and_encode_band,
1118         search_for_ms,
1119     },
1120     {
1121         search_for_quantizers_fast,
1122         encode_window_bands_info,
1123         quantize_and_encode_band,
1124         search_for_ms,
1125     },
1126 };