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, 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         size = sce->ics.swb_sizes[swb];
 333         if (sce->zeroes[win*16 + swb]) {
 334             for (cb = 0; cb < 12; cb++) {
 335                 path[swb+1][cb].prev_idx = cb;
 336                 path[swb+1][cb].cost     = path[swb][cb].cost;
 337                 path[swb+1][cb].run      = path[swb][cb].run + 1;
 338             }
 339         } else {
 340             float minrd = next_minrd;
 341             int mincb = next_mincb;
 342             next_minrd = INFINITY;
 343             next_mincb = 0;
 344             for (cb = 0; cb < 12; cb++) {
 345                 float cost_stay_here, cost_get_here;
 346                 float rd = 0.0f;
 347                 for (w = 0; w < group_len; w++) {
 348                     FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(win+w)*16+swb];
 349                     rd += quantize_band_cost(s, sce->coeffs + start + w*128,
 350                                              s->scoefs + start + w*128, size,
 351                                              sce->sf_idx[(win+w)*16+swb], cb,
 352                                              lambda / band->threshold, INFINITY, NULL);
 353                 }
 354                 cost_stay_here = path[swb][cb].cost + rd;
 355                 cost_get_here  = minrd              + rd + run_bits + 4;
 356                 if (   run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run]
 357                     != run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run+1])
 358                     cost_stay_here += run_bits;
 359                 if (cost_get_here < cost_stay_here) {
 360                     path[swb+1][cb].prev_idx = mincb;
 361                     path[swb+1][cb].cost     = cost_get_here;
 362                     path[swb+1][cb].run      = 1;
 363                 } else {
 364                     path[swb+1][cb].prev_idx = cb;
 365                     path[swb+1][cb].cost     = cost_stay_here;
 366                     path[swb+1][cb].run      = path[swb][cb].run + 1;
 367                 }
 368                 if (path[swb+1][cb].cost < next_minrd) {
 369                     next_minrd = path[swb+1][cb].cost;
 370                     next_mincb = cb;
 371                 }
 372             }
 373         }
 374         start += sce->ics.swb_sizes[swb];
 375     }
 376
 377     //convert resulting path from backward-linked list
 378     stack_len = 0;
 379     idx       = 0;
 380     for (cb = 1; cb < 12; cb++)
 381         if (path[max_sfb][cb].cost < path[max_sfb][idx].cost)
 382             idx = cb;
 383     ppos = max_sfb;
 384     while (ppos > 0) {
 385         cb = idx;
 386         stackrun[stack_len] = path[ppos][cb].run;
 387         stackcb [stack_len] = cb;
 388         idx = path[ppos-path[ppos][cb].run+1][cb].prev_idx;
 389         ppos -= path[ppos][cb].run;
 390         stack_len++;
 391     }
 392     //perform actual band info encoding
 393     start = 0;
 394     for (i = stack_len - 1; i >= 0; i--) {
 395         put_bits(&s->pb, 4, stackcb[i]);
 396         count = stackrun[i];
 397         memset(sce->zeroes + win*16 + start, !stackcb[i], count);
 398         //XXX: memset when band_type is also uint8_t
 399         for (j = 0; j < count; j++) {
 400             sce->band_type[win*16 + start] =  stackcb[i];
 401             start++;
 402         }
 403         while (count >= run_esc) {
 404             put_bits(&s->pb, run_bits, run_esc);
 405             count -= run_esc;
 406         }
 407         put_bits(&s->pb, run_bits, count);
 408     }
 409 }
 410
 411 static void codebook_trellis_rate(AACEncContext *s, SingleChannelElement *sce,
 412                                   int win, int group_len, const float lambda)
 413 {
 414     BandCodingPath path[120][12];
 415     int w, swb, cb, start, size;
 416     int i, j;
 417     const int max_sfb  = sce->ics.max_sfb;
 418     const int run_bits = sce->ics.num_windows == 1 ? 5 : 3;
 419     const int run_esc  = (1 << run_bits) - 1;
 420     int idx, ppos, count;
 421     int stackrun[120], stackcb[120], stack_len;
 422     float next_minrd = INFINITY;
 423     int next_mincb = 0;
 424
 425     abs_pow34_v(s->scoefs, sce->coeffs, 1024);
 426     start = win*128;
 427     for (cb = 0; cb < 12; cb++) {
 428         path[0][cb].cost     = run_bits+4;
 429         path[0][cb].prev_idx = -1;
 430         path[0][cb].run      = 0;
 431     }
 432     for (swb = 0; swb < max_sfb; swb++) {
 433         size = sce->ics.swb_sizes[swb];
 434         if (sce->zeroes[win*16 + swb]) {
 435             float cost_stay_here = path[swb][0].cost;
 436             float cost_get_here  = next_minrd + run_bits + 4;
 437             if (   run_value_bits[sce->ics.num_windows == 8][path[swb][0].run]
 438                 != run_value_bits[sce->ics.num_windows == 8][path[swb][0].run+1])
 439                 cost_stay_here += run_bits;
 440             if (cost_get_here < cost_stay_here) {
 441                 path[swb+1][0].prev_idx = next_mincb;
 442                 path[swb+1][0].cost     = cost_get_here;
 443                 path[swb+1][0].run      = 1;
 444             } else {
 445                 path[swb+1][0].prev_idx = 0;
 446                 path[swb+1][0].cost     = cost_stay_here;
 447                 path[swb+1][0].run      = path[swb][0].run + 1;
 448             }
 449             next_minrd = path[swb+1][0].cost;
 450             next_mincb = 0;
 451             for (cb = 1; cb < 12; cb++) {
 452                 path[swb+1][cb].cost = 61450;
 453                 path[swb+1][cb].prev_idx = -1;
 454                 path[swb+1][cb].run = 0;
 455             }
 456         } else {
 457             float minrd = next_minrd;
 458             int mincb = next_mincb;
 459             int startcb = sce->band_type[win*16+swb];
 460             next_minrd = INFINITY;
 461             next_mincb = 0;
 462             for (cb = 0; cb < startcb; cb++) {
 463                 path[swb+1][cb].cost = 61450;
 464                 path[swb+1][cb].prev_idx = -1;
 465                 path[swb+1][cb].run = 0;
 466             }
 467             for (cb = startcb; cb < 12; cb++) {
 468                 float cost_stay_here, cost_get_here;
 469                 float rd = 0.0f;
 470                 for (w = 0; w < group_len; w++) {
 471                     rd += quantize_band_cost(s, sce->coeffs + start + w*128,
 472                                              s->scoefs + start + w*128, size,
 473                                              sce->sf_idx[(win+w)*16+swb], cb,
 474                                              0, INFINITY, NULL);
 475                 }
 476                 cost_stay_here = path[swb][cb].cost + rd;
 477                 cost_get_here  = minrd              + rd + run_bits + 4;
 478                 if (   run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run]
 479                     != run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run+1])
 480                     cost_stay_here += run_bits;
 481                 if (cost_get_here < cost_stay_here) {
 482                     path[swb+1][cb].prev_idx = mincb;
 483                     path[swb+1][cb].cost     = cost_get_here;
 484                     path[swb+1][cb].run      = 1;
 485                 } else {
 486                     path[swb+1][cb].prev_idx = cb;
 487                     path[swb+1][cb].cost     = cost_stay_here;
 488                     path[swb+1][cb].run      = path[swb][cb].run + 1;
 489                 }
 490                 if (path[swb+1][cb].cost < next_minrd) {
 491                     next_minrd = path[swb+1][cb].cost;
 492                     next_mincb = cb;
 493                 }
 494             }
 495         }
 496         start += sce->ics.swb_sizes[swb];
 497     }
 498
 499     //convert resulting path from backward-linked list
 500     stack_len = 0;
 501     idx       = 0;
 502     for (cb = 1; cb < 12; cb++)
 503         if (path[max_sfb][cb].cost < path[max_sfb][idx].cost)
 504             idx = cb;
 505     ppos = max_sfb;
 506     while (ppos > 0) {
 507         assert(idx >= 0);
 508         cb = idx;
 509         stackrun[stack_len] = path[ppos][cb].run;
 510         stackcb [stack_len] = cb;
 511         idx = path[ppos-path[ppos][cb].run+1][cb].prev_idx;
 512         ppos -= path[ppos][cb].run;
 513         stack_len++;
 514     }
 515     //perform actual band info encoding
 516     start = 0;
 517     for (i = stack_len - 1; i >= 0; i--) {
 518         put_bits(&s->pb, 4, stackcb[i]);
 519         count = stackrun[i];
 520         memset(sce->zeroes + win*16 + start, !stackcb[i], count);
 521         //XXX: memset when band_type is also uint8_t
 522         for (j = 0; j < count; j++) {
 523             sce->band_type[win*16 + start] =  stackcb[i];
 524             start++;
 525         }
 526         while (count >= run_esc) {
 527             put_bits(&s->pb, run_bits, run_esc);
 528             count -= run_esc;
 529         }
 530         put_bits(&s->pb, run_bits, count);
 531     }
 532 }
 533
 534 /** Return the minimum scalefactor where the quantized coef does not clip. */
 535 static av_always_inline uint8_t coef2minsf(float coef) {
 536     return av_clip_uint8(log2f(coef)*4 - 69 + SCALE_ONE_POS - SCALE_DIV_512);
 537 }
 538
 539 /** Return the maximum scalefactor where the quantized coef is not zero. */
 540 static av_always_inline uint8_t coef2maxsf(float coef) {
 541     return av_clip_uint8(log2f(coef)*4 +  6 + SCALE_ONE_POS - SCALE_DIV_512);
 542 }
 543
 544 typedef struct TrellisPath {
 545     float cost;
 546     int prev;
 547 } TrellisPath;
 548
 549 #define TRELLIS_STAGES 121
 550 #define TRELLIS_STATES (SCALE_MAX_DIFF+1)
 551
 552 static void search_for_quantizers_anmr(AVCodecContext *avctx, AACEncContext *s,
 553                                        SingleChannelElement *sce,
 554                                        const float lambda)
 555 {
 556     int q, w, w2, g, start = 0;
 557     int i, j;
 558     int idx;
 559     TrellisPath paths[TRELLIS_STAGES][TRELLIS_STATES];
 560     int bandaddr[TRELLIS_STAGES];
 561     int minq;
 562     float mincost;
 563     float q0f = FLT_MAX, q1f = 0.0f, qnrgf = 0.0f;
 564     int q0, q1, qcnt = 0;
 565
 566     for (i = 0; i < 1024; i++) {
 567         float t = fabsf(sce->coeffs[i]);
 568         if (t > 0.0f) {
 569             q0f = FFMIN(q0f, t);
 570             q1f = FFMAX(q1f, t);
 571             qnrgf += t*t;
 572             qcnt++;
 573         }
 574     }
 575
 576     if (!qcnt) {
 577         memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
 578         memset(sce->zeroes, 1, sizeof(sce->zeroes));
 579         return;
 580     }
 581
 582     //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
 583     q0 = coef2minsf(q0f);
 584     //maximum scalefactor index is when maximum coefficient after quantizing is still not zero
 585     q1 = coef2maxsf(q1f);
 586     //av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1);
 587     if (q1 - q0 > 60) {
 588         int q0low  = q0;
 589         int q1high = q1;
 590         //minimum scalefactor index is when maximum nonzero coefficient after quantizing is not clipped
 591         int qnrg = av_clip_uint8(log2f(sqrtf(qnrgf/qcnt))*4 - 31 + SCALE_ONE_POS - SCALE_DIV_512);
 592         q1 = qnrg + 30;
 593         q0 = qnrg - 30;
 594         //av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1);
 595         if (q0 < q0low) {
 596             q1 += q0low - q0;
 597             q0  = q0low;
 598         } else if (q1 > q1high) {
 599             q0 -= q1 - q1high;
 600             q1  = q1high;
 601         }
 602     }
 603     //av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1);
 604
 605     for (i = 0; i < TRELLIS_STATES; i++) {
 606         paths[0][i].cost    = 0.0f;
 607         paths[0][i].prev    = -1;
 608     }
 609     for (j = 1; j < TRELLIS_STAGES; j++) {
 610         for (i = 0; i < TRELLIS_STATES; i++) {
 611             paths[j][i].cost    = INFINITY;
 612             paths[j][i].prev    = -2;
 613         }
 614     }
 615     idx = 1;
 616     abs_pow34_v(s->scoefs, sce->coeffs, 1024);
 617     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 618         start = w*128;
 619         for (g = 0; g < sce->ics.num_swb; g++) {
 620             const float *coefs = sce->coeffs + start;
 621             float qmin, qmax;
 622             int nz = 0;
 623
 624             bandaddr[idx] = w * 16 + g;
 625             qmin = INT_MAX;
 626             qmax = 0.0f;
 627             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 628                 FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
 629                 if (band->energy <= band->threshold || band->threshold == 0.0f) {
 630                     sce->zeroes[(w+w2)*16+g] = 1;
 631                     continue;
 632                 }
 633                 sce->zeroes[(w+w2)*16+g] = 0;
 634                 nz = 1;
 635                 for (i = 0; i < sce->ics.swb_sizes[g]; i++) {
 636                     float t = fabsf(coefs[w2*128+i]);
 637                     if (t > 0.0f)
 638                         qmin = FFMIN(qmin, t);
 639                     qmax = FFMAX(qmax, t);
 640                 }
 641             }
 642             if (nz) {
 643                 int minscale, maxscale;
 644                 float minrd = INFINITY;
 645                 float maxval;
 646                 //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
 647                 minscale = coef2minsf(qmin);
 648                 //maximum scalefactor index is when maximum coefficient after quantizing is still not zero
 649                 maxscale = coef2maxsf(qmax);
 650                 minscale = av_clip(minscale - q0, 0, TRELLIS_STATES - 1);
 651                 maxscale = av_clip(maxscale - q0, 0, TRELLIS_STATES);
 652                 maxval = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], s->scoefs+start);
 653                 for (q = minscale; q < maxscale; q++) {
 654                     float dist = 0;
 655                     int cb = find_min_book(maxval, sce->sf_idx[w*16+g]);
 656                     for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 657                         FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
 658                         dist += quantize_band_cost(s, coefs + w2*128, s->scoefs + start + w2*128, sce->ics.swb_sizes[g],
 659                                                    q + q0, cb, lambda / band->threshold, INFINITY, NULL);
 660                     }
 661                     minrd = FFMIN(minrd, dist);
 662
 663                     for (i = 0; i < q1 - q0; i++) {
 664                         float cost;
 665                         cost = paths[idx - 1][i].cost + dist
 666                                + ff_aac_scalefactor_bits[q - i + SCALE_DIFF_ZERO];
 667                         if (cost < paths[idx][q].cost) {
 668                             paths[idx][q].cost    = cost;
 669                             paths[idx][q].prev    = i;
 670                         }
 671                     }
 672                 }
 673             } else {
 674                 for (q = 0; q < q1 - q0; q++) {
 675                     paths[idx][q].cost = paths[idx - 1][q].cost + 1;
 676                     paths[idx][q].prev = q;
 677                 }
 678             }
 679             sce->zeroes[w*16+g] = !nz;
 680             start += sce->ics.swb_sizes[g];
 681             idx++;
 682         }
 683     }
 684     idx--;
 685     mincost = paths[idx][0].cost;
 686     minq    = 0;
 687     for (i = 1; i < TRELLIS_STATES; i++) {
 688         if (paths[idx][i].cost < mincost) {
 689             mincost = paths[idx][i].cost;
 690             minq = i;
 691         }
 692     }
 693     while (idx) {
 694         sce->sf_idx[bandaddr[idx]] = minq + q0;
 695         minq = paths[idx][minq].prev;
 696         idx--;
 697     }
 698     //set the same quantizers inside window groups
 699     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
 700         for (g = 0;  g < sce->ics.num_swb; g++)
 701             for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)
 702                 sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
 703 }
 704
 705 /**
 706  * two-loop quantizers search taken from ISO 13818-7 Appendix C
 707  */
 708 static void search_for_quantizers_twoloop(AVCodecContext *avctx,
 709                                           AACEncContext *s,
 710                                           SingleChannelElement *sce,
 711                                           const float lambda)
 712 {
 713     int start = 0, i, w, w2, g;
 714     int destbits = avctx->bit_rate * 1024.0 / avctx->sample_rate / avctx->channels;
 715     float dists[128], uplims[128];
 716     float maxvals[128];
 717     int fflag, minscaler;
 718     int its  = 0;
 719     int allz = 0;
 720     float minthr = INFINITY;
 721
 722     //XXX: some heuristic to determine initial quantizers will reduce search time
 723     memset(dists, 0, sizeof(dists));
 724     //determine zero bands and upper limits
 725     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 726         for (g = 0;  g < sce->ics.num_swb; g++) {
 727             int nz = 0;
 728             float uplim = 0.0f;
 729             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 730                 FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
 731                 uplim += band->threshold;
 732                 if (band->energy <= band->threshold || band->threshold == 0.0f) {
 733                     sce->zeroes[(w+w2)*16+g] = 1;
 734                     continue;
 735                 }
 736                 nz = 1;
 737             }
 738             uplims[w*16+g] = uplim *512;
 739             sce->zeroes[w*16+g] = !nz;
 740             if (nz)
 741                 minthr = FFMIN(minthr, uplim);
 742             allz |= nz;
 743         }
 744     }
 745     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 746         for (g = 0;  g < sce->ics.num_swb; g++) {
 747             if (sce->zeroes[w*16+g]) {
 748                 sce->sf_idx[w*16+g] = SCALE_ONE_POS;
 749                 continue;
 750             }
 751             sce->sf_idx[w*16+g] = SCALE_ONE_POS + FFMIN(log2f(uplims[w*16+g]/minthr)*4,59);
 752         }
 753     }
 754
 755     if (!allz)
 756         return;
 757     abs_pow34_v(s->scoefs, sce->coeffs, 1024);
 758
 759     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 760         start = w*128;
 761         for (g = 0;  g < sce->ics.num_swb; g++) {
 762             const float *scaled = s->scoefs + start;
 763             maxvals[w*16+g] = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], scaled);
 764             start += sce->ics.swb_sizes[g];
 765         }
 766     }
 767
 768     //perform two-loop search
 769     //outer loop - improve quality
 770     do {
 771         int tbits, qstep;
 772         minscaler = sce->sf_idx[0];
 773         //inner loop - quantize spectrum to fit into given number of bits
 774         qstep = its ? 1 : 32;
 775         do {
 776             int prev = -1;
 777             tbits = 0;
 778             fflag = 0;
 779             for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 780                 start = w*128;
 781                 for (g = 0;  g < sce->ics.num_swb; g++) {
 782                     const float *coefs = sce->coeffs + start;
 783                     const float *scaled = s->scoefs + start;
 784                     int bits = 0;
 785                     int cb;
 786                     float dist = 0.0f;
 787
 788                     if (sce->zeroes[w*16+g] || sce->sf_idx[w*16+g] >= 218) {
 789                         start += sce->ics.swb_sizes[g];
 790                         continue;
 791                     }
 792                     minscaler = FFMIN(minscaler, sce->sf_idx[w*16+g]);
 793                     cb = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]);
 794                     for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 795                         int b;
 796                         dist += quantize_band_cost(s, coefs + w2*128,
 797                                                    scaled + w2*128,
 798                                                    sce->ics.swb_sizes[g],
 799                                                    sce->sf_idx[w*16+g],
 800                                                    cb,
 801                                                    1.0f,
 802                                                    INFINITY,
 803                                                    &b);
 804                         bits += b;
 805                     }
 806                     dists[w*16+g] = dist - bits;
 807                     if (prev != -1) {
 808                         bits += ff_aac_scalefactor_bits[sce->sf_idx[w*16+g] - prev + SCALE_DIFF_ZERO];
 809                     }
 810                     tbits += bits;
 811                     start += sce->ics.swb_sizes[g];
 812                     prev = sce->sf_idx[w*16+g];
 813                 }
 814             }
 815             if (tbits > destbits) {
 816                 for (i = 0; i < 128; i++)
 817                     if (sce->sf_idx[i] < 218 - qstep)
 818                         sce->sf_idx[i] += qstep;
 819             } else {
 820                 for (i = 0; i < 128; i++)
 821                     if (sce->sf_idx[i] > 60 - qstep)
 822                         sce->sf_idx[i] -= qstep;
 823             }
 824             qstep >>= 1;
 825             if (!qstep && tbits > destbits*1.02 && sce->sf_idx[0] < 217)
 826                 qstep = 1;
 827         } while (qstep);
 828
 829         fflag = 0;
 830         minscaler = av_clip(minscaler, 60, 255 - SCALE_MAX_DIFF);
 831         for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 832             for (g = 0; g < sce->ics.num_swb; g++) {
 833                 int prevsc = sce->sf_idx[w*16+g];
 834                 if (dists[w*16+g] > uplims[w*16+g] && sce->sf_idx[w*16+g] > 60) {
 835                     if (find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]-1))
 836                         sce->sf_idx[w*16+g]--;
 837                     else //Try to make sure there is some energy in every band
 838                         sce->sf_idx[w*16+g]-=2;
 839                 }
 840                 sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], minscaler, minscaler + SCALE_MAX_DIFF);
 841                 sce->sf_idx[w*16+g] = FFMIN(sce->sf_idx[w*16+g], 219);
 842                 if (sce->sf_idx[w*16+g] != prevsc)
 843                     fflag = 1;
 844                 sce->band_type[w*16+g] = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]);
 845             }
 846         }
 847         its++;
 848     } while (fflag && its < 10);
 849 }
 850
 851 static void search_for_quantizers_faac(AVCodecContext *avctx, AACEncContext *s,
 852                                        SingleChannelElement *sce,
 853                                        const float lambda)
 854 {
 855     int start = 0, i, w, w2, g;
 856     float uplim[128], maxq[128];
 857     int minq, maxsf;
 858     float distfact = ((sce->ics.num_windows > 1) ? 85.80 : 147.84) / lambda;
 859     int last = 0, lastband = 0, curband = 0;
 860     float avg_energy = 0.0;
 861     if (sce->ics.num_windows == 1) {
 862         start = 0;
 863         for (i = 0; i < 1024; i++) {
 864             if (i - start >= sce->ics.swb_sizes[curband]) {
 865                 start += sce->ics.swb_sizes[curband];
 866                 curband++;
 867             }
 868             if (sce->coeffs[i]) {
 869                 avg_energy += sce->coeffs[i] * sce->coeffs[i];
 870                 last = i;
 871                 lastband = curband;
 872             }
 873         }
 874     } else {
 875         for (w = 0; w < 8; w++) {
 876             const float *coeffs = sce->coeffs + w*128;
 877             start = 0;
 878             for (i = 0; i < 128; i++) {
 879                 if (i - start >= sce->ics.swb_sizes[curband]) {
 880                     start += sce->ics.swb_sizes[curband];
 881                     curband++;
 882                 }
 883                 if (coeffs[i]) {
 884                     avg_energy += coeffs[i] * coeffs[i];
 885                     last = FFMAX(last, i);
 886                     lastband = FFMAX(lastband, curband);
 887                 }
 888             }
 889         }
 890     }
 891     last++;
 892     avg_energy /= last;
 893     if (avg_energy == 0.0f) {
 894         for (i = 0; i < FF_ARRAY_ELEMS(sce->sf_idx); i++)
 895             sce->sf_idx[i] = SCALE_ONE_POS;
 896         return;
 897     }
 898     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 899         start = w*128;
 900         for (g = 0; g < sce->ics.num_swb; g++) {
 901             float *coefs   = sce->coeffs + start;
 902             const int size = sce->ics.swb_sizes[g];
 903             int start2 = start, end2 = start + size, peakpos = start;
 904             float maxval = -1, thr = 0.0f, t;
 905             maxq[w*16+g] = 0.0f;
 906             if (g > lastband) {
 907                 maxq[w*16+g] = 0.0f;
 908                 start += size;
 909                 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++)
 910                     memset(coefs + w2*128, 0, sizeof(coefs[0])*size);
 911                 continue;
 912             }
 913             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 914                 for (i = 0; i < size; i++) {
 915                     float t = coefs[w2*128+i]*coefs[w2*128+i];
 916                     maxq[w*16+g] = FFMAX(maxq[w*16+g], fabsf(coefs[w2*128 + i]));
 917                     thr += t;
 918                     if (sce->ics.num_windows == 1 && maxval < t) {
 919                         maxval  = t;
 920                         peakpos = start+i;
 921                     }
 922                 }
 923             }
 924             if (sce->ics.num_windows == 1) {
 925                 start2 = FFMAX(peakpos - 2, start2);
 926                 end2   = FFMIN(peakpos + 3, end2);
 927             } else {
 928                 start2 -= start;
 929                 end2   -= start;
 930             }
 931             start += size;
 932             thr = pow(thr / (avg_energy * (end2 - start2)), 0.3 + 0.1*(lastband - g) / lastband);
 933             t   = 1.0 - (1.0 * start2 / last);
 934             uplim[w*16+g] = distfact / (1.4 * thr + t*t*t + 0.075);
 935         }
 936     }
 937     memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
 938     abs_pow34_v(s->scoefs, sce->coeffs, 1024);
 939     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 940         start = w*128;
 941         for (g = 0;  g < sce->ics.num_swb; g++) {
 942             const float *coefs  = sce->coeffs + start;
 943             const float *scaled = s->scoefs   + start;
 944             const int size      = sce->ics.swb_sizes[g];
 945             int scf, prev_scf, step;
 946             int min_scf = -1, max_scf = 256;
 947             float curdiff;
 948             if (maxq[w*16+g] < 21.544) {
 949                 sce->zeroes[w*16+g] = 1;
 950                 start += size;
 951                 continue;
 952             }
 953             sce->zeroes[w*16+g] = 0;
 954             scf  = prev_scf = av_clip(SCALE_ONE_POS - SCALE_DIV_512 - log2f(1/maxq[w*16+g])*16/3, 60, 218);
 955             step = 16;
 956             for (;;) {
 957                 float dist = 0.0f;
 958                 int quant_max;
 959
 960                 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 961                     int b;
 962                     dist += quantize_band_cost(s, coefs + w2*128,
 963                                                scaled + w2*128,
 964                                                sce->ics.swb_sizes[g],
 965                                                scf,
 966                                                ESC_BT,
 967                                                lambda,
 968                                                INFINITY,
 969                                                &b);
 970                     dist -= b;
 971                 }
 972                 dist *= 1.0f / 512.0f / lambda;
 973                 quant_max = quant(maxq[w*16+g], ff_aac_pow2sf_tab[POW_SF2_ZERO - scf + SCALE_ONE_POS - SCALE_DIV_512]);
 974                 if (quant_max >= 8191) { // too much, return to the previous quantizer
 975                     sce->sf_idx[w*16+g] = prev_scf;
 976                     break;
 977                 }
 978                 prev_scf = scf;
 979                 curdiff = fabsf(dist - uplim[w*16+g]);
 980                 if (curdiff <= 1.0f)
 981                     step = 0;
 982                 else
 983                     step = log2f(curdiff);
 984                 if (dist > uplim[w*16+g])
 985                     step = -step;
 986                 scf += step;
 987                 scf = av_clip_uint8(scf);
 988                 step = scf - prev_scf;
 989                 if (FFABS(step) <= 1 || (step > 0 && scf >= max_scf) || (step < 0 && scf <= min_scf)) {
 990                     sce->sf_idx[w*16+g] = av_clip(scf, min_scf, max_scf);
 991                     break;
 992                 }
 993                 if (step > 0)
 994                     min_scf = prev_scf;
 995                 else
 996                     max_scf = prev_scf;
 997             }
 998             start += size;
 999         }
1000     }
1001     minq = sce->sf_idx[0] ? sce->sf_idx[0] : INT_MAX;
1002     for (i = 1; i < 128; i++) {
1003         if (!sce->sf_idx[i])
1004             sce->sf_idx[i] = sce->sf_idx[i-1];
1005         else
1006             minq = FFMIN(minq, sce->sf_idx[i]);
1007     }
1008     if (minq == INT_MAX)
1009         minq = 0;
1010     minq = FFMIN(minq, SCALE_MAX_POS);
1011     maxsf = FFMIN(minq + SCALE_MAX_DIFF, SCALE_MAX_POS);
1012     for (i = 126; i >= 0; i--) {
1013         if (!sce->sf_idx[i])
1014             sce->sf_idx[i] = sce->sf_idx[i+1];
1015         sce->sf_idx[i] = av_clip(sce->sf_idx[i], minq, maxsf);
1016     }
1017 }
1018
1019 static void search_for_quantizers_fast(AVCodecContext *avctx, AACEncContext *s,
1020                                        SingleChannelElement *sce,
1021                                        const float lambda)
1022 {
1023     int i, w, w2, g;
1024     int minq = 255;
1025
1026     memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
1027     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
1028         for (g = 0; g < sce->ics.num_swb; g++) {
1029             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
1030                 FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
1031                 if (band->energy <= band->threshold) {
1032                     sce->sf_idx[(w+w2)*16+g] = 218;
1033                     sce->zeroes[(w+w2)*16+g] = 1;
1034                 } else {
1035                     sce->sf_idx[(w+w2)*16+g] = av_clip(SCALE_ONE_POS - SCALE_DIV_512 + log2f(band->threshold), 80, 218);
1036                     sce->zeroes[(w+w2)*16+g] = 0;
1037                 }
1038                 minq = FFMIN(minq, sce->sf_idx[(w+w2)*16+g]);
1039             }
1040         }
1041     }
1042     for (i = 0; i < 128; i++) {
1043         sce->sf_idx[i] = 140;
1044         //av_clip(sce->sf_idx[i], minq, minq + SCALE_MAX_DIFF - 1);
1045     }
1046     //set the same quantizers inside window groups
1047     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
1048         for (g = 0;  g < sce->ics.num_swb; g++)
1049             for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)
1050                 sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
1051 }
1052
1053 static void search_for_ms(AACEncContext *s, ChannelElement *cpe,
1054                           const float lambda)
1055 {
1056     int start = 0, i, w, w2, g;
1057     float M[128], S[128];
1058     float *L34 = s->scoefs, *R34 = s->scoefs + 128, *M34 = s->scoefs + 128*2, *S34 = s->scoefs + 128*3;
1059     SingleChannelElement *sce0 = &cpe->ch[0];
1060     SingleChannelElement *sce1 = &cpe->ch[1];
1061     if (!cpe->common_window)
1062         return;
1063     for (w = 0; w < sce0->ics.num_windows; w += sce0->ics.group_len[w]) {
1064         for (g = 0;  g < sce0->ics.num_swb; g++) {
1065             if (!cpe->ch[0].zeroes[w*16+g] && !cpe->ch[1].zeroes[w*16+g]) {
1066                 float dist1 = 0.0f, dist2 = 0.0f;
1067                 for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {
1068                     FFPsyBand *band0 = &s->psy.ch[s->cur_channel+0].psy_bands[(w+w2)*16+g];
1069                     FFPsyBand *band1 = &s->psy.ch[s->cur_channel+1].psy_bands[(w+w2)*16+g];
1070                     float minthr = FFMIN(band0->threshold, band1->threshold);
1071                     float maxthr = FFMAX(band0->threshold, band1->threshold);
1072                     for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {
1073                         M[i] = (sce0->coeffs[start+w2*128+i]
1074                               + sce1->coeffs[start+w2*128+i]) * 0.5;
1075                         S[i] =  M[i]
1076                               - sce1->coeffs[start+w2*128+i];
1077                     }
1078                     abs_pow34_v(L34, sce0->coeffs+start+w2*128, sce0->ics.swb_sizes[g]);
1079                     abs_pow34_v(R34, sce1->coeffs+start+w2*128, sce0->ics.swb_sizes[g]);
1080                     abs_pow34_v(M34, M,                         sce0->ics.swb_sizes[g]);
1081                     abs_pow34_v(S34, S,                         sce0->ics.swb_sizes[g]);
1082                     dist1 += quantize_band_cost(s, sce0->coeffs + start + w2*128,
1083                                                 L34,
1084                                                 sce0->ics.swb_sizes[g],
1085                                                 sce0->sf_idx[(w+w2)*16+g],
1086                                                 sce0->band_type[(w+w2)*16+g],
1087                                                 lambda / band0->threshold, INFINITY, NULL);
1088                     dist1 += quantize_band_cost(s, sce1->coeffs + start + w2*128,
1089                                                 R34,
1090                                                 sce1->ics.swb_sizes[g],
1091                                                 sce1->sf_idx[(w+w2)*16+g],
1092                                                 sce1->band_type[(w+w2)*16+g],
1093                                                 lambda / band1->threshold, INFINITY, NULL);
1094                     dist2 += quantize_band_cost(s, M,
1095                                                 M34,
1096                                                 sce0->ics.swb_sizes[g],
1097                                                 sce0->sf_idx[(w+w2)*16+g],
1098                                                 sce0->band_type[(w+w2)*16+g],
1099                                                 lambda / maxthr, INFINITY, NULL);
1100                     dist2 += quantize_band_cost(s, S,
1101                                                 S34,
1102                                                 sce1->ics.swb_sizes[g],
1103                                                 sce1->sf_idx[(w+w2)*16+g],
1104                                                 sce1->band_type[(w+w2)*16+g],
1105                                                 lambda / minthr, INFINITY, NULL);
1106                 }
1107                 cpe->ms_mask[w*16+g] = dist2 < dist1;
1108             }
1109             start += sce0->ics.swb_sizes[g];
1110         }
1111     }
1112 }
1113
1114 AACCoefficientsEncoder ff_aac_coders[] = {
1115     {
1116         search_for_quantizers_faac,
1117         encode_window_bands_info,
1118         quantize_and_encode_band,
1119         search_for_ms,
1120     },
1121     {
1122         search_for_quantizers_anmr,
1123         encode_window_bands_info,
1124         quantize_and_encode_band,
1125         search_for_ms,
1126     },
1127     {
1128         search_for_quantizers_twoloop,
1129         codebook_trellis_rate,
1130         quantize_and_encode_band,
1131         search_for_ms,
1132     },
1133     {
1134         search_for_quantizers_fast,
1135         encode_window_bands_info,
1136         quantize_and_encode_band,
1137         search_for_ms,
1138     },
1139 };