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

   1 /*
   2  * AAC coefficients encoder
   3  * Copyright (C) 2008-2009 Konstantin Shishkov
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  24  * AAC coefficients encoder
  25  */
  26
  27 /***********************************
  28  *              TODOs:
  29  * speedup quantizer selection
  30  * add sane pulse detection
  31  ***********************************/
  32
  33 #include "libavutil/libm.h" // brought forward to work around cygwin header breakage
  34
  35 #include <float.h>
  36
  37 #include "libavutil/mathematics.h"
  38 #include "mathops.h"
  39 #include "avcodec.h"
  40 #include "put_bits.h"
  41 #include "aac.h"
  42 #include "aacenc.h"
  43 #include "aactab.h"
  44 #include "aacenctab.h"
  45 #include "aacenc_utils.h"
  46 #include "aacenc_quantization.h"
  47
  48 #include "aacenc_is.h"
  49 #include "aacenc_tns.h"
  50 #include "aacenc_ltp.h"
  51 #include "aacenc_pred.h"
  52
  53 #include "libavcodec/aaccoder_twoloop.h"
  54
  55 /* Parameter of f(x) = a*(lambda/100), defines the maximum fourier spread
  56  * beyond which no PNS is used (since the SFBs contain tone rather than noise) */
  57 #define NOISE_SPREAD_THRESHOLD 0.9f
  58
  59 /* Parameter of f(x) = a*(100/lambda), defines how much PNS is allowed to
  60  * replace low energy non zero bands */
  61 #define NOISE_LAMBDA_REPLACE 1.948f
  62
  63 #include "libavcodec/aaccoder_trellis.h"
  64
  65 /**
  66  * structure used in optimal codebook search
  67  */
  68 typedef struct BandCodingPath {
  69     int prev_idx; ///< pointer to the previous path point
  70     float cost;   ///< path cost
  71     int run;
  72 } BandCodingPath;
  73
  74 /**
  75  * Encode band info for single window group bands.
  76  */
  77 static void encode_window_bands_info(AACEncContext *s, SingleChannelElement *sce,
  78                                      int win, int group_len, const float lambda)
  79 {
  80     BandCodingPath path[120][CB_TOT_ALL];
  81     int w, swb, cb, start, size;
  82     int i, j;
  83     const int max_sfb  = sce->ics.max_sfb;
  84     const int run_bits = sce->ics.num_windows == 1 ? 5 : 3;
  85     const int run_esc  = (1 << run_bits) - 1;
  86     int idx, ppos, count;
  87     int stackrun[120], stackcb[120], stack_len;
  88     float next_minrd = INFINITY;
  89     int next_mincb = 0;
  90
  91     abs_pow34_v(s->scoefs, sce->coeffs, 1024);
  92     start = win*128;
  93     for (cb = 0; cb < CB_TOT_ALL; cb++) {
  94         path[0][cb].cost     = 0.0f;
  95         path[0][cb].prev_idx = -1;
  96         path[0][cb].run      = 0;
  97     }
  98     for (swb = 0; swb < max_sfb; swb++) {
  99         size = sce->ics.swb_sizes[swb];
 100         if (sce->zeroes[win*16 + swb]) {
 101             for (cb = 0; cb < CB_TOT_ALL; cb++) {
 102                 path[swb+1][cb].prev_idx = cb;
 103                 path[swb+1][cb].cost     = path[swb][cb].cost;
 104                 path[swb+1][cb].run      = path[swb][cb].run + 1;
 105             }
 106         } else {
 107             float minrd = next_minrd;
 108             int mincb = next_mincb;
 109             next_minrd = INFINITY;
 110             next_mincb = 0;
 111             for (cb = 0; cb < CB_TOT_ALL; cb++) {
 112                 float cost_stay_here, cost_get_here;
 113                 float rd = 0.0f;
 114                 if (cb >= 12 && sce->band_type[win*16+swb] < aac_cb_out_map[cb] ||
 115                     cb  < aac_cb_in_map[sce->band_type[win*16+swb]] && sce->band_type[win*16+swb] > aac_cb_out_map[cb]) {
 116                     path[swb+1][cb].prev_idx = -1;
 117                     path[swb+1][cb].cost     = INFINITY;
 118                     path[swb+1][cb].run      = path[swb][cb].run + 1;
 119                     continue;
 120                 }
 121                 for (w = 0; w < group_len; w++) {
 122                     FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(win+w)*16+swb];
 123                     rd += quantize_band_cost(s, &sce->coeffs[start + w*128],
 124                                              &s->scoefs[start + w*128], size,
 125                                              sce->sf_idx[(win+w)*16+swb], aac_cb_out_map[cb],
 126                                              lambda / band->threshold, INFINITY, NULL, NULL, 0);
 127                 }
 128                 cost_stay_here = path[swb][cb].cost + rd;
 129                 cost_get_here  = minrd              + rd + run_bits + 4;
 130                 if (   run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run]
 131                     != run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run+1])
 132                     cost_stay_here += run_bits;
 133                 if (cost_get_here < cost_stay_here) {
 134                     path[swb+1][cb].prev_idx = mincb;
 135                     path[swb+1][cb].cost     = cost_get_here;
 136                     path[swb+1][cb].run      = 1;
 137                 } else {
 138                     path[swb+1][cb].prev_idx = cb;
 139                     path[swb+1][cb].cost     = cost_stay_here;
 140                     path[swb+1][cb].run      = path[swb][cb].run + 1;
 141                 }
 142                 if (path[swb+1][cb].cost < next_minrd) {
 143                     next_minrd = path[swb+1][cb].cost;
 144                     next_mincb = cb;
 145                 }
 146             }
 147         }
 148         start += sce->ics.swb_sizes[swb];
 149     }
 150
 151     //convert resulting path from backward-linked list
 152     stack_len = 0;
 153     idx       = 0;
 154     for (cb = 1; cb < CB_TOT_ALL; cb++)
 155         if (path[max_sfb][cb].cost < path[max_sfb][idx].cost)
 156             idx = cb;
 157     ppos = max_sfb;
 158     while (ppos > 0) {
 159         av_assert1(idx >= 0);
 160         cb = idx;
 161         stackrun[stack_len] = path[ppos][cb].run;
 162         stackcb [stack_len] = cb;
 163         idx = path[ppos-path[ppos][cb].run+1][cb].prev_idx;
 164         ppos -= path[ppos][cb].run;
 165         stack_len++;
 166     }
 167     //perform actual band info encoding
 168     start = 0;
 169     for (i = stack_len - 1; i >= 0; i--) {
 170         cb = aac_cb_out_map[stackcb[i]];
 171         put_bits(&s->pb, 4, cb);
 172         count = stackrun[i];
 173         memset(sce->zeroes + win*16 + start, !cb, count);
 174         //XXX: memset when band_type is also uint8_t
 175         for (j = 0; j < count; j++) {
 176             sce->band_type[win*16 + start] = cb;
 177             start++;
 178         }
 179         while (count >= run_esc) {
 180             put_bits(&s->pb, run_bits, run_esc);
 181             count -= run_esc;
 182         }
 183         put_bits(&s->pb, run_bits, count);
 184     }
 185 }
 186
 187
 188 typedef struct TrellisPath {
 189     float cost;
 190     int prev;
 191 } TrellisPath;
 192
 193 #define TRELLIS_STAGES 121
 194 #define TRELLIS_STATES (SCALE_MAX_DIFF+1)
 195
 196 static void set_special_band_scalefactors(AACEncContext *s, SingleChannelElement *sce)
 197 {
 198     int w, g;
 199     int prevscaler_n = -255, prevscaler_i = 0;
 200     int bands = 0;
 201
 202     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 203         for (g = 0;  g < sce->ics.num_swb; g++) {
 204             if (sce->zeroes[w*16+g])
 205                 continue;
 206             if (sce->band_type[w*16+g] == INTENSITY_BT || sce->band_type[w*16+g] == INTENSITY_BT2) {
 207                 sce->sf_idx[w*16+g] = av_clip(roundf(log2f(sce->is_ener[w*16+g])*2), -155, 100);
 208                 bands++;
 209             } else if (sce->band_type[w*16+g] == NOISE_BT) {
 210                 sce->sf_idx[w*16+g] = av_clip(3+ceilf(log2f(sce->pns_ener[w*16+g])*2), -100, 155);
 211                 if (prevscaler_n == -255)
 212                     prevscaler_n = sce->sf_idx[w*16+g];
 213                 bands++;
 214             }
 215         }
 216     }
 217
 218     if (!bands)
 219         return;
 220
 221     /* Clip the scalefactor indices */
 222     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 223         for (g = 0;  g < sce->ics.num_swb; g++) {
 224             if (sce->zeroes[w*16+g])
 225                 continue;
 226             if (sce->band_type[w*16+g] == INTENSITY_BT || sce->band_type[w*16+g] == INTENSITY_BT2) {
 227                 sce->sf_idx[w*16+g] = prevscaler_i = av_clip(sce->sf_idx[w*16+g], prevscaler_i - SCALE_MAX_DIFF, prevscaler_i + SCALE_MAX_DIFF);
 228             } else if (sce->band_type[w*16+g] == NOISE_BT) {
 229                 sce->sf_idx[w*16+g] = prevscaler_n = av_clip(sce->sf_idx[w*16+g], prevscaler_n - SCALE_MAX_DIFF, prevscaler_n + SCALE_MAX_DIFF);
 230             }
 231         }
 232     }
 233 }
 234
 235 static void search_for_quantizers_anmr(AVCodecContext *avctx, AACEncContext *s,
 236                                        SingleChannelElement *sce,
 237                                        const float lambda)
 238 {
 239     int q, w, w2, g, start = 0;
 240     int i, j;
 241     int idx;
 242     TrellisPath paths[TRELLIS_STAGES][TRELLIS_STATES];
 243     int bandaddr[TRELLIS_STAGES];
 244     int minq;
 245     float mincost;
 246     float q0f = FLT_MAX, q1f = 0.0f, qnrgf = 0.0f;
 247     int q0, q1, qcnt = 0;
 248
 249     for (i = 0; i < 1024; i++) {
 250         float t = fabsf(sce->coeffs[i]);
 251         if (t > 0.0f) {
 252             q0f = FFMIN(q0f, t);
 253             q1f = FFMAX(q1f, t);
 254             qnrgf += t*t;
 255             qcnt++;
 256         }
 257     }
 258
 259     if (!qcnt) {
 260         memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
 261         memset(sce->zeroes, 1, sizeof(sce->zeroes));
 262         return;
 263     }
 264
 265     //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
 266     q0 = av_clip(coef2minsf(q0f), 0, SCALE_MAX_POS-1);
 267     //maximum scalefactor index is when maximum coefficient after quantizing is still not zero
 268     q1 = av_clip(coef2maxsf(q1f), 1, SCALE_MAX_POS);
 269     if (q1 - q0 > 60) {
 270         int q0low  = q0;
 271         int q1high = q1;
 272         //minimum scalefactor index is when maximum nonzero coefficient after quantizing is not clipped
 273         int qnrg = av_clip_uint8(log2f(sqrtf(qnrgf/qcnt))*4 - 31 + SCALE_ONE_POS - SCALE_DIV_512);
 274         q1 = qnrg + 30;
 275         q0 = qnrg - 30;
 276         if (q0 < q0low) {
 277             q1 += q0low - q0;
 278             q0  = q0low;
 279         } else if (q1 > q1high) {
 280             q0 -= q1 - q1high;
 281             q1  = q1high;
 282         }
 283     }
 284     // q0 == q1 isn't really a legal situation
 285     if (q0 == q1) {
 286         // the following is indirect but guarantees q1 != q0 && q1 near q0
 287         q1 = av_clip(q0+1, 1, SCALE_MAX_POS);
 288         q0 = av_clip(q1-1, 0, SCALE_MAX_POS - 1);
 289     }
 290
 291     for (i = 0; i < TRELLIS_STATES; i++) {
 292         paths[0][i].cost    = 0.0f;
 293         paths[0][i].prev    = -1;
 294     }
 295     for (j = 1; j < TRELLIS_STAGES; j++) {
 296         for (i = 0; i < TRELLIS_STATES; i++) {
 297             paths[j][i].cost    = INFINITY;
 298             paths[j][i].prev    = -2;
 299         }
 300     }
 301     idx = 1;
 302     abs_pow34_v(s->scoefs, sce->coeffs, 1024);
 303     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 304         start = w*128;
 305         for (g = 0; g < sce->ics.num_swb; g++) {
 306             const float *coefs = &sce->coeffs[start];
 307             float qmin, qmax;
 308             int nz = 0;
 309
 310             bandaddr[idx] = w * 16 + g;
 311             qmin = INT_MAX;
 312             qmax = 0.0f;
 313             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 314                 FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
 315                 if (band->energy <= band->threshold || band->threshold == 0.0f) {
 316                     sce->zeroes[(w+w2)*16+g] = 1;
 317                     continue;
 318                 }
 319                 sce->zeroes[(w+w2)*16+g] = 0;
 320                 nz = 1;
 321                 for (i = 0; i < sce->ics.swb_sizes[g]; i++) {
 322                     float t = fabsf(coefs[w2*128+i]);
 323                     if (t > 0.0f)
 324                         qmin = FFMIN(qmin, t);
 325                     qmax = FFMAX(qmax, t);
 326                 }
 327             }
 328             if (nz) {
 329                 int minscale, maxscale;
 330                 float minrd = INFINITY;
 331                 float maxval;
 332                 //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
 333                 minscale = coef2minsf(qmin);
 334                 //maximum scalefactor index is when maximum coefficient after quantizing is still not zero
 335                 maxscale = coef2maxsf(qmax);
 336                 minscale = av_clip(minscale - q0, 0, TRELLIS_STATES - 1);
 337                 maxscale = av_clip(maxscale - q0, 0, TRELLIS_STATES);
 338                 if (minscale == maxscale) {
 339                     maxscale = av_clip(minscale+1, 1, TRELLIS_STATES);
 340                     minscale = av_clip(maxscale-1, 0, TRELLIS_STATES - 1);
 341                 }
 342                 maxval = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], s->scoefs+start);
 343                 for (q = minscale; q < maxscale; q++) {
 344                     float dist = 0;
 345                     int cb = find_min_book(maxval, sce->sf_idx[w*16+g]);
 346                     for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 347                         FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
 348                         dist += quantize_band_cost(s, coefs + w2*128, s->scoefs + start + w2*128, sce->ics.swb_sizes[g],
 349                                                    q + q0, cb, lambda / band->threshold, INFINITY, NULL, NULL, 0);
 350                     }
 351                     minrd = FFMIN(minrd, dist);
 352
 353                     for (i = 0; i < q1 - q0; i++) {
 354                         float cost;
 355                         cost = paths[idx - 1][i].cost + dist
 356                                + ff_aac_scalefactor_bits[q - i + SCALE_DIFF_ZERO];
 357                         if (cost < paths[idx][q].cost) {
 358                             paths[idx][q].cost    = cost;
 359                             paths[idx][q].prev    = i;
 360                         }
 361                     }
 362                 }
 363             } else {
 364                 for (q = 0; q < q1 - q0; q++) {
 365                     paths[idx][q].cost = paths[idx - 1][q].cost + 1;
 366                     paths[idx][q].prev = q;
 367                 }
 368             }
 369             sce->zeroes[w*16+g] = !nz;
 370             start += sce->ics.swb_sizes[g];
 371             idx++;
 372         }
 373     }
 374     idx--;
 375     mincost = paths[idx][0].cost;
 376     minq    = 0;
 377     for (i = 1; i < TRELLIS_STATES; i++) {
 378         if (paths[idx][i].cost < mincost) {
 379             mincost = paths[idx][i].cost;
 380             minq = i;
 381         }
 382     }
 383     while (idx) {
 384         sce->sf_idx[bandaddr[idx]] = minq + q0;
 385         minq = FFMAX(paths[idx][minq].prev, 0);
 386         idx--;
 387     }
 388     //set the same quantizers inside window groups
 389     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
 390         for (g = 0;  g < sce->ics.num_swb; g++)
 391             for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)
 392                 sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
 393 }
 394
 395
 396 static void search_for_quantizers_faac(AVCodecContext *avctx, AACEncContext *s,
 397                                        SingleChannelElement *sce,
 398                                        const float lambda)
 399 {
 400     int start = 0, i, w, w2, g;
 401     float uplim[128], maxq[128];
 402     int minq, maxsf;
 403     float distfact = ((sce->ics.num_windows > 1) ? 85.80 : 147.84) / lambda;
 404     int last = 0, lastband = 0, curband = 0;
 405     float avg_energy = 0.0;
 406     if (sce->ics.num_windows == 1) {
 407         start = 0;
 408         for (i = 0; i < 1024; i++) {
 409             if (i - start >= sce->ics.swb_sizes[curband]) {
 410                 start += sce->ics.swb_sizes[curband];
 411                 curband++;
 412             }
 413             if (sce->coeffs[i]) {
 414                 avg_energy += sce->coeffs[i] * sce->coeffs[i];
 415                 last = i;
 416                 lastband = curband;
 417             }
 418         }
 419     } else {
 420         for (w = 0; w < 8; w++) {
 421             const float *coeffs = &sce->coeffs[w*128];
 422             curband = start = 0;
 423             for (i = 0; i < 128; i++) {
 424                 if (i - start >= sce->ics.swb_sizes[curband]) {
 425                     start += sce->ics.swb_sizes[curband];
 426                     curband++;
 427                 }
 428                 if (coeffs[i]) {
 429                     avg_energy += coeffs[i] * coeffs[i];
 430                     last = FFMAX(last, i);
 431                     lastband = FFMAX(lastband, curband);
 432                 }
 433             }
 434         }
 435     }
 436     last++;
 437     avg_energy /= last;
 438     if (avg_energy == 0.0f) {
 439         for (i = 0; i < FF_ARRAY_ELEMS(sce->sf_idx); i++)
 440             sce->sf_idx[i] = SCALE_ONE_POS;
 441         return;
 442     }
 443     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 444         start = w*128;
 445         for (g = 0; g < sce->ics.num_swb; g++) {
 446             float *coefs   = &sce->coeffs[start];
 447             const int size = sce->ics.swb_sizes[g];
 448             int start2 = start, end2 = start + size, peakpos = start;
 449             float maxval = -1, thr = 0.0f, t;
 450             maxq[w*16+g] = 0.0f;
 451             if (g > lastband) {
 452                 maxq[w*16+g] = 0.0f;
 453                 start += size;
 454                 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++)
 455                     memset(coefs + w2*128, 0, sizeof(coefs[0])*size);
 456                 continue;
 457             }
 458             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 459                 for (i = 0; i < size; i++) {
 460                     float t = coefs[w2*128+i]*coefs[w2*128+i];
 461                     maxq[w*16+g] = FFMAX(maxq[w*16+g], fabsf(coefs[w2*128 + i]));
 462                     thr += t;
 463                     if (sce->ics.num_windows == 1 && maxval < t) {
 464                         maxval  = t;
 465                         peakpos = start+i;
 466                     }
 467                 }
 468             }
 469             if (sce->ics.num_windows == 1) {
 470                 start2 = FFMAX(peakpos - 2, start2);
 471                 end2   = FFMIN(peakpos + 3, end2);
 472             } else {
 473                 start2 -= start;
 474                 end2   -= start;
 475             }
 476             start += size;
 477             thr = pow(thr / (avg_energy * (end2 - start2)), 0.3 + 0.1*(lastband - g) / lastband);
 478             t   = 1.0 - (1.0 * start2 / last);
 479             uplim[w*16+g] = distfact / (1.4 * thr + t*t*t + 0.075);
 480         }
 481     }
 482     memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
 483     abs_pow34_v(s->scoefs, sce->coeffs, 1024);
 484     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 485         start = w*128;
 486         for (g = 0;  g < sce->ics.num_swb; g++) {
 487             const float *coefs  = &sce->coeffs[start];
 488             const float *scaled = &s->scoefs[start];
 489             const int size      = sce->ics.swb_sizes[g];
 490             int scf, prev_scf, step;
 491             int min_scf = -1, max_scf = 256;
 492             float curdiff;
 493             if (maxq[w*16+g] < 21.544) {
 494                 sce->zeroes[w*16+g] = 1;
 495                 start += size;
 496                 continue;
 497             }
 498             sce->zeroes[w*16+g] = 0;
 499             scf  = prev_scf = av_clip(SCALE_ONE_POS - SCALE_DIV_512 - log2f(1/maxq[w*16+g])*16/3, 60, 218);
 500             for (;;) {
 501                 float dist = 0.0f;
 502                 int quant_max;
 503
 504                 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 505                     int b;
 506                     dist += quantize_band_cost(s, coefs + w2*128,
 507                                                scaled + w2*128,
 508                                                sce->ics.swb_sizes[g],
 509                                                scf,
 510                                                ESC_BT,
 511                                                lambda,
 512                                                INFINITY,
 513                                                &b, NULL,
 514                                                0);
 515                     dist -= b;
 516                 }
 517                 dist *= 1.0f / 512.0f / lambda;
 518                 quant_max = quant(maxq[w*16+g], ff_aac_pow2sf_tab[POW_SF2_ZERO - scf + SCALE_ONE_POS - SCALE_DIV_512], ROUND_STANDARD);
 519                 if (quant_max >= 8191) { // too much, return to the previous quantizer
 520                     sce->sf_idx[w*16+g] = prev_scf;
 521                     break;
 522                 }
 523                 prev_scf = scf;
 524                 curdiff = fabsf(dist - uplim[w*16+g]);
 525                 if (curdiff <= 1.0f)
 526                     step = 0;
 527                 else
 528                     step = log2f(curdiff);
 529                 if (dist > uplim[w*16+g])
 530                     step = -step;
 531                 scf += step;
 532                 scf = av_clip_uint8(scf);
 533                 step = scf - prev_scf;
 534                 if (FFABS(step) <= 1 || (step > 0 && scf >= max_scf) || (step < 0 && scf <= min_scf)) {
 535                     sce->sf_idx[w*16+g] = av_clip(scf, min_scf, max_scf);
 536                     break;
 537                 }
 538                 if (step > 0)
 539                     min_scf = prev_scf;
 540                 else
 541                     max_scf = prev_scf;
 542             }
 543             start += size;
 544         }
 545     }
 546     minq = sce->sf_idx[0] ? sce->sf_idx[0] : INT_MAX;
 547     for (i = 1; i < 128; i++) {
 548         if (!sce->sf_idx[i])
 549             sce->sf_idx[i] = sce->sf_idx[i-1];
 550         else
 551             minq = FFMIN(minq, sce->sf_idx[i]);
 552     }
 553     if (minq == INT_MAX)
 554         minq = 0;
 555     minq = FFMIN(minq, SCALE_MAX_POS);
 556     maxsf = FFMIN(minq + SCALE_MAX_DIFF, SCALE_MAX_POS);
 557     for (i = 126; i >= 0; i--) {
 558         if (!sce->sf_idx[i])
 559             sce->sf_idx[i] = sce->sf_idx[i+1];
 560         sce->sf_idx[i] = av_clip(sce->sf_idx[i], minq, maxsf);
 561     }
 562 }
 563
 564 static void search_for_quantizers_fast(AVCodecContext *avctx, AACEncContext *s,
 565                                        SingleChannelElement *sce,
 566                                        const float lambda)
 567 {
 568     int i, w, w2, g;
 569     int minq = 255;
 570
 571     memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
 572     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 573         for (g = 0; g < sce->ics.num_swb; g++) {
 574             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 575                 FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
 576                 if (band->energy <= band->threshold) {
 577                     sce->sf_idx[(w+w2)*16+g] = 218;
 578                     sce->zeroes[(w+w2)*16+g] = 1;
 579                 } else {
 580                     sce->sf_idx[(w+w2)*16+g] = av_clip(SCALE_ONE_POS - SCALE_DIV_512 + log2f(band->threshold), 80, 218);
 581                     sce->zeroes[(w+w2)*16+g] = 0;
 582                 }
 583                 minq = FFMIN(minq, sce->sf_idx[(w+w2)*16+g]);
 584             }
 585         }
 586     }
 587     for (i = 0; i < 128; i++) {
 588         sce->sf_idx[i] = 140;
 589         //av_clip(sce->sf_idx[i], minq, minq + SCALE_MAX_DIFF - 1);
 590     }
 591     //set the same quantizers inside window groups
 592     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
 593         for (g = 0;  g < sce->ics.num_swb; g++)
 594             for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)
 595                 sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
 596 }
 597
 598 static void search_for_pns(AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce)
 599 {
 600     FFPsyBand *band;
 601     int w, g, w2, i;
 602     int wlen = 1024 / sce->ics.num_windows;
 603     int bandwidth, cutoff;
 604     float *PNS = &s->scoefs[0*128], *PNS34 = &s->scoefs[1*128];
 605     float *NOR34 = &s->scoefs[3*128];
 606     uint8_t nextband[128];
 607     const float lambda = s->lambda;
 608     const float freq_mult = avctx->sample_rate*0.5f/wlen;
 609     const float thr_mult = NOISE_LAMBDA_REPLACE*(100.0f/lambda);
 610     const float spread_threshold = FFMIN(0.75f, NOISE_SPREAD_THRESHOLD*FFMAX(0.5f, lambda/100.f));
 611     const float dist_bias = av_clipf(4.f * 120 / lambda, 0.25f, 4.0f);
 612     const float pns_transient_energy_r = FFMIN(0.7f, lambda / 140.f);
 613
 614     int refbits = avctx->bit_rate * 1024.0 / avctx->sample_rate
 615         / ((avctx->flags & CODEC_FLAG_QSCALE) ? 2.0f : avctx->channels)
 616         * (lambda / 120.f);
 617
 618     /** Keep this in sync with twoloop's cutoff selection */
 619     float rate_bandwidth_multiplier = 1.5f;
 620     int prev = -1000, prev_sf = -1;
 621     int frame_bit_rate = (avctx->flags & CODEC_FLAG_QSCALE)
 622         ? (refbits * rate_bandwidth_multiplier * avctx->sample_rate / 1024)
 623         : (avctx->bit_rate / avctx->channels);
 624
 625     frame_bit_rate *= 1.15f;
 626
 627     if (avctx->cutoff > 0) {
 628         bandwidth = avctx->cutoff;
 629     } else {
 630         bandwidth = FFMAX(3000, AAC_CUTOFF_FROM_BITRATE(frame_bit_rate, 1, avctx->sample_rate));
 631     }
 632
 633     cutoff = bandwidth * 2 * wlen / avctx->sample_rate;
 634
 635     memcpy(sce->band_alt, sce->band_type, sizeof(sce->band_type));
 636     ff_init_nextband_map(sce, nextband);
 637     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 638         int wstart = w*128;
 639         for (g = 0;  g < sce->ics.num_swb; g++) {
 640             int noise_sfi;
 641             float dist1 = 0.0f, dist2 = 0.0f, noise_amp;
 642             float pns_energy = 0.0f, pns_tgt_energy, energy_ratio, dist_thresh;
 643             float sfb_energy = 0.0f, threshold = 0.0f, spread = 2.0f;
 644             float min_energy = -1.0f, max_energy = 0.0f;
 645             const int start = wstart+sce->ics.swb_offset[g];
 646             const float freq = (start-wstart)*freq_mult;
 647             const float freq_boost = FFMAX(0.88f*freq/NOISE_LOW_LIMIT, 1.0f);
 648             if (freq < NOISE_LOW_LIMIT || (start-wstart) >= cutoff) {
 649                 if (!sce->zeroes[w*16+g])
 650                     prev_sf = sce->sf_idx[w*16+g];
 651                 continue;
 652             }
 653             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 654                 band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
 655                 sfb_energy += band->energy;
 656                 spread     = FFMIN(spread, band->spread);
 657                 threshold  += band->threshold;
 658                 if (!w2) {
 659                     min_energy = max_energy = band->energy;
 660                 } else {
 661                     min_energy = FFMIN(min_energy, band->energy);
 662                     max_energy = FFMAX(max_energy, band->energy);
 663                 }
 664             }
 665
 666             /* Ramps down at ~8000Hz and loosens the dist threshold */
 667             dist_thresh = av_clipf(2.5f*NOISE_LOW_LIMIT/freq, 0.5f, 2.5f) * dist_bias;
 668
 669             /* PNS is acceptable when all of these are true:
 670              * 1. high spread energy (noise-like band)
 671              * 2. near-threshold energy (high PE means the random nature of PNS content will be noticed)
 672              * 3. on short window groups, all windows have similar energy (variations in energy would be destroyed by PNS)
 673              *
 674              * At this stage, point 2 is relaxed for zeroed bands near the noise threshold (hole avoidance is more important)
 675              */
 676             if ((!sce->zeroes[w*16+g] && !ff_sfdelta_can_remove_band(sce, nextband, prev_sf, w*16+g)) ||
 677                 ((sce->zeroes[w*16+g] || !sce->band_alt[w*16+g]) && sfb_energy < threshold*sqrtf(1.0f/freq_boost)) || spread < spread_threshold ||
 678                 (!sce->zeroes[w*16+g] && sce->band_alt[w*16+g] && sfb_energy > threshold*thr_mult*freq_boost) ||
 679                 min_energy < pns_transient_energy_r * max_energy ) {
 680                 sce->pns_ener[w*16+g] = sfb_energy;
 681                 if (!sce->zeroes[w*16+g])
 682                     prev_sf = sce->sf_idx[w*16+g];
 683                 continue;
 684             }
 685
 686             pns_tgt_energy = sfb_energy*FFMIN(1.0f, spread*spread);
 687             noise_sfi = av_clip(roundf(log2f(pns_tgt_energy)*2), -100, 155); /* Quantize */
 688             noise_amp = -ff_aac_pow2sf_tab[noise_sfi + POW_SF2_ZERO];    /* Dequantize */
 689             if (prev != -1000) {
 690                 int noise_sfdiff = noise_sfi - prev + SCALE_DIFF_ZERO;
 691                 if (noise_sfdiff < 0 || noise_sfdiff > 2*SCALE_MAX_DIFF) {
 692                     if (!sce->zeroes[w*16+g])
 693                         prev_sf = sce->sf_idx[w*16+g];
 694                     continue;
 695                 }
 696             }
 697             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 698                 float band_energy, scale, pns_senergy;
 699                 const int start_c = (w+w2)*128+sce->ics.swb_offset[g];
 700                 band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
 701                 for (i = 0; i < sce->ics.swb_sizes[g]; i+=2) {
 702                     double rnd[2];
 703                     av_bmg_get(&s->lfg, rnd);
 704                     PNS[i+0] = (float)rnd[0];
 705                     PNS[i+1] = (float)rnd[1];
 706                 }
 707                 band_energy = s->fdsp->scalarproduct_float(PNS, PNS, sce->ics.swb_sizes[g]);
 708                 scale = noise_amp/sqrtf(band_energy);
 709                 s->fdsp->vector_fmul_scalar(PNS, PNS, scale, sce->ics.swb_sizes[g]);
 710                 pns_senergy = s->fdsp->scalarproduct_float(PNS, PNS, sce->ics.swb_sizes[g]);
 711                 pns_energy += pns_senergy;
 712                 abs_pow34_v(NOR34, &sce->coeffs[start_c], sce->ics.swb_sizes[g]);
 713                 abs_pow34_v(PNS34, PNS, sce->ics.swb_sizes[g]);
 714                 dist1 += quantize_band_cost(s, &sce->coeffs[start_c],
 715                                             NOR34,
 716                                             sce->ics.swb_sizes[g],
 717                                             sce->sf_idx[(w+w2)*16+g],
 718                                             sce->band_alt[(w+w2)*16+g],
 719                                             lambda/band->threshold, INFINITY, NULL, NULL, 0);
 720                 /* Estimate rd on average as 5 bits for SF, 4 for the CB, plus spread energy * lambda/thr */
 721                 dist2 += band->energy/(band->spread*band->spread)*lambda*dist_thresh/band->threshold;
 722             }
 723             if (g && sce->band_type[w*16+g-1] == NOISE_BT) {
 724                 dist2 += 5;
 725             } else {
 726                 dist2 += 9;
 727             }
 728             energy_ratio = pns_tgt_energy/pns_energy; /* Compensates for quantization error */
 729             sce->pns_ener[w*16+g] = energy_ratio*pns_tgt_energy;
 730             if (sce->zeroes[w*16+g] || !sce->band_alt[w*16+g] || (energy_ratio > 0.85f && energy_ratio < 1.25f && dist2 < dist1)) {
 731                 sce->band_type[w*16+g] = NOISE_BT;
 732                 sce->zeroes[w*16+g] = 0;
 733                 prev = noise_sfi;
 734             } else {
 735                 if (!sce->zeroes[w*16+g])
 736                     prev_sf = sce->sf_idx[w*16+g];
 737             }
 738         }
 739     }
 740 }
 741
 742 static void mark_pns(AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce)
 743 {
 744     FFPsyBand *band;
 745     int w, g, w2;
 746     int wlen = 1024 / sce->ics.num_windows;
 747     int bandwidth, cutoff;
 748     const float lambda = s->lambda;
 749     const float freq_mult = avctx->sample_rate*0.5f/wlen;
 750     const float spread_threshold = FFMIN(0.75f, NOISE_SPREAD_THRESHOLD*FFMAX(0.5f, lambda/100.f));
 751     const float pns_transient_energy_r = FFMIN(0.7f, lambda / 140.f);
 752
 753     int refbits = avctx->bit_rate * 1024.0 / avctx->sample_rate
 754         / ((avctx->flags & CODEC_FLAG_QSCALE) ? 2.0f : avctx->channels)
 755         * (lambda / 120.f);
 756
 757     /** Keep this in sync with twoloop's cutoff selection */
 758     float rate_bandwidth_multiplier = 1.5f;
 759     int frame_bit_rate = (avctx->flags & CODEC_FLAG_QSCALE)
 760         ? (refbits * rate_bandwidth_multiplier * avctx->sample_rate / 1024)
 761         : (avctx->bit_rate / avctx->channels);
 762
 763     frame_bit_rate *= 1.15f;
 764
 765     if (avctx->cutoff > 0) {
 766         bandwidth = avctx->cutoff;
 767     } else {
 768         bandwidth = FFMAX(3000, AAC_CUTOFF_FROM_BITRATE(frame_bit_rate, 1, avctx->sample_rate));
 769     }
 770
 771     cutoff = bandwidth * 2 * wlen / avctx->sample_rate;
 772
 773     memcpy(sce->band_alt, sce->band_type, sizeof(sce->band_type));
 774     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 775         for (g = 0;  g < sce->ics.num_swb; g++) {
 776             float sfb_energy = 0.0f, threshold = 0.0f, spread = 2.0f;
 777             float min_energy = -1.0f, max_energy = 0.0f;
 778             const int start = sce->ics.swb_offset[g];
 779             const float freq = start*freq_mult;
 780             const float freq_boost = FFMAX(0.88f*freq/NOISE_LOW_LIMIT, 1.0f);
 781             if (freq < NOISE_LOW_LIMIT || start >= cutoff) {
 782                 sce->can_pns[w*16+g] = 0;
 783                 continue;
 784             }
 785             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 786                 band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
 787                 sfb_energy += band->energy;
 788                 spread     = FFMIN(spread, band->spread);
 789                 threshold  += band->threshold;
 790                 if (!w2) {
 791                     min_energy = max_energy = band->energy;
 792                 } else {
 793                     min_energy = FFMIN(min_energy, band->energy);
 794                     max_energy = FFMAX(max_energy, band->energy);
 795                 }
 796             }
 797
 798             /* PNS is acceptable when all of these are true:
 799              * 1. high spread energy (noise-like band)
 800              * 2. near-threshold energy (high PE means the random nature of PNS content will be noticed)
 801              * 3. on short window groups, all windows have similar energy (variations in energy would be destroyed by PNS)
 802              */
 803             sce->pns_ener[w*16+g] = sfb_energy;
 804             if (sfb_energy < threshold*sqrtf(1.5f/freq_boost) || spread < spread_threshold || min_energy < pns_transient_energy_r * max_energy) {
 805                 sce->can_pns[w*16+g] = 0;
 806             } else {
 807                 sce->can_pns[w*16+g] = 1;
 808             }
 809         }
 810     }
 811 }
 812
 813 static void search_for_ms(AACEncContext *s, ChannelElement *cpe)
 814 {
 815     int start = 0, i, w, w2, g, sid_sf_boost, prev_mid, prev_side;
 816     uint8_t nextband0[128], nextband1[128];
 817     float M[128], S[128];
 818     float *L34 = s->scoefs, *R34 = s->scoefs + 128, *M34 = s->scoefs + 128*2, *S34 = s->scoefs + 128*3;
 819     const float lambda = s->lambda;
 820     const float mslambda = FFMIN(1.0f, lambda / 120.f);
 821     SingleChannelElement *sce0 = &cpe->ch[0];
 822     SingleChannelElement *sce1 = &cpe->ch[1];
 823     if (!cpe->common_window)
 824         return;
 825
 826     /** Scout out next nonzero bands */
 827     ff_init_nextband_map(sce0, nextband0);
 828     ff_init_nextband_map(sce1, nextband1);
 829
 830     prev_mid = sce0->sf_idx[0];
 831     prev_side = sce1->sf_idx[0];
 832     for (w = 0; w < sce0->ics.num_windows; w += sce0->ics.group_len[w]) {
 833         start = 0;
 834         for (g = 0;  g < sce0->ics.num_swb; g++) {
 835             float bmax = bval2bmax(g * 17.0f / sce0->ics.num_swb) / 0.0045f;
 836             if (!cpe->is_mask[w*16+g])
 837                 cpe->ms_mask[w*16+g] = 0;
 838             if (!sce0->zeroes[w*16+g] && !sce1->zeroes[w*16+g] && !cpe->is_mask[w*16+g]) {
 839                 float Mmax = 0.0f, Smax = 0.0f;
 840
 841                 /* Must compute mid/side SF and book for the whole window group */
 842                 for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {
 843                     for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {
 844                         M[i] = (sce0->coeffs[start+(w+w2)*128+i]
 845                               + sce1->coeffs[start+(w+w2)*128+i]) * 0.5;
 846                         S[i] =  M[i]
 847                               - sce1->coeffs[start+(w+w2)*128+i];
 848                     }
 849                     abs_pow34_v(M34, M, sce0->ics.swb_sizes[g]);
 850                     abs_pow34_v(S34, S, sce0->ics.swb_sizes[g]);
 851                     for (i = 0; i < sce0->ics.swb_sizes[g]; i++ ) {
 852                         Mmax = FFMAX(Mmax, M34[i]);
 853                         Smax = FFMAX(Smax, S34[i]);
 854                     }
 855                 }
 856
 857                 for (sid_sf_boost = 0; sid_sf_boost < 4; sid_sf_boost++) {
 858                     float dist1 = 0.0f, dist2 = 0.0f;
 859                     int B0 = 0, B1 = 0;
 860                     int minidx;
 861                     int mididx, sididx;
 862                     int midcb, sidcb;
 863
 864                     minidx = FFMIN(sce0->sf_idx[w*16+g], sce1->sf_idx[w*16+g]);
 865                     mididx = av_clip(minidx, 0, SCALE_MAX_POS - SCALE_DIV_512);
 866                     sididx = av_clip(minidx - sid_sf_boost * 3, 0, SCALE_MAX_POS - SCALE_DIV_512);
 867                     if (sce0->band_type[w*16+g] != NOISE_BT && sce1->band_type[w*16+g] != NOISE_BT
 868                         && (   !ff_sfdelta_can_replace(sce0, nextband0, prev_mid, mididx, w*16+g)
 869                             || !ff_sfdelta_can_replace(sce1, nextband1, prev_side, sididx, w*16+g))) {
 870                         /* scalefactor range violation, bad stuff, will decrease quality unacceptably */
 871                         continue;
 872                     }
 873
 874                     midcb = find_min_book(Mmax, mididx);
 875                     sidcb = find_min_book(Smax, sididx);
 876
 877                     /* No CB can be zero */
 878                     midcb = FFMAX(1,midcb);
 879                     sidcb = FFMAX(1,sidcb);
 880
 881                     for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {
 882                         FFPsyBand *band0 = &s->psy.ch[s->cur_channel+0].psy_bands[(w+w2)*16+g];
 883                         FFPsyBand *band1 = &s->psy.ch[s->cur_channel+1].psy_bands[(w+w2)*16+g];
 884                         float minthr = FFMIN(band0->threshold, band1->threshold);
 885                         int b1,b2,b3,b4;
 886                         for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {
 887                             M[i] = (sce0->coeffs[start+(w+w2)*128+i]
 888                                   + sce1->coeffs[start+(w+w2)*128+i]) * 0.5;
 889                             S[i] =  M[i]
 890                                   - sce1->coeffs[start+(w+w2)*128+i];
 891                         }
 892
 893                         abs_pow34_v(L34, sce0->coeffs+start+(w+w2)*128, sce0->ics.swb_sizes[g]);
 894                         abs_pow34_v(R34, sce1->coeffs+start+(w+w2)*128, sce0->ics.swb_sizes[g]);
 895                         abs_pow34_v(M34, M,                         sce0->ics.swb_sizes[g]);
 896                         abs_pow34_v(S34, S,                         sce0->ics.swb_sizes[g]);
 897                         dist1 += quantize_band_cost(s, &sce0->coeffs[start + (w+w2)*128],
 898                                                     L34,
 899                                                     sce0->ics.swb_sizes[g],
 900                                                     sce0->sf_idx[w*16+g],
 901                                                     sce0->band_type[w*16+g],
 902                                                     lambda / band0->threshold, INFINITY, &b1, NULL, 0);
 903                         dist1 += quantize_band_cost(s, &sce1->coeffs[start + (w+w2)*128],
 904                                                     R34,
 905                                                     sce1->ics.swb_sizes[g],
 906                                                     sce1->sf_idx[w*16+g],
 907                                                     sce1->band_type[w*16+g],
 908                                                     lambda / band1->threshold, INFINITY, &b2, NULL, 0);
 909                         dist2 += quantize_band_cost(s, M,
 910                                                     M34,
 911                                                     sce0->ics.swb_sizes[g],
 912                                                     mididx,
 913                                                     midcb,
 914                                                     lambda / minthr, INFINITY, &b3, NULL, 0);
 915                         dist2 += quantize_band_cost(s, S,
 916                                                     S34,
 917                                                     sce1->ics.swb_sizes[g],
 918                                                     sididx,
 919                                                     sidcb,
 920                                                     mslambda / (minthr * bmax), INFINITY, &b4, NULL, 0);
 921                         B0 += b1+b2;
 922                         B1 += b3+b4;
 923                         dist1 -= b1+b2;
 924                         dist2 -= b3+b4;
 925                     }
 926                     cpe->ms_mask[w*16+g] = dist2 <= dist1 && B1 < B0;
 927                     if (cpe->ms_mask[w*16+g]) {
 928                         if (sce0->band_type[w*16+g] != NOISE_BT && sce1->band_type[w*16+g] != NOISE_BT) {
 929                             sce0->sf_idx[w*16+g] = mididx;
 930                             sce1->sf_idx[w*16+g] = sididx;
 931                             sce0->band_type[w*16+g] = midcb;
 932                             sce1->band_type[w*16+g] = sidcb;
 933                         } else if ((sce0->band_type[w*16+g] != NOISE_BT) ^ (sce1->band_type[w*16+g] != NOISE_BT)) {
 934                             /* ms_mask unneeded, and it confuses some decoders */
 935                             cpe->ms_mask[w*16+g] = 0;
 936                         }
 937                         break;
 938                     } else if (B1 > B0) {
 939                         /* More boost won't fix this */
 940                         break;
 941                     }
 942                 }
 943             }
 944             if (!sce0->zeroes[w*16+g] && sce0->band_type[w*16+g] < RESERVED_BT)
 945                 prev_mid = sce0->sf_idx[w*16+g];
 946             if (!sce1->zeroes[w*16+g] && !cpe->is_mask[w*16+g] && sce1->band_type[w*16+g] < RESERVED_BT)
 947                 prev_side = sce1->sf_idx[w*16+g];
 948             start += sce0->ics.swb_sizes[g];
 949         }
 950     }
 951 }
 952
 953 AACCoefficientsEncoder ff_aac_coders[AAC_CODER_NB] = {
 954     [AAC_CODER_FAAC] = {
 955         search_for_quantizers_faac,
 956         encode_window_bands_info,
 957         quantize_and_encode_band,
 958         ff_aac_encode_tns_info,
 959         ff_aac_encode_ltp_info,
 960         ff_aac_encode_main_pred,
 961         ff_aac_adjust_common_pred,
 962         ff_aac_adjust_common_ltp,
 963         ff_aac_apply_main_pred,
 964         ff_aac_apply_tns,
 965         ff_aac_update_ltp,
 966         ff_aac_ltp_insert_new_frame,
 967         set_special_band_scalefactors,
 968         search_for_pns,
 969         mark_pns,
 970         ff_aac_search_for_tns,
 971         ff_aac_search_for_ltp,
 972         search_for_ms,
 973         ff_aac_search_for_is,
 974         ff_aac_search_for_pred,
 975     },
 976     [AAC_CODER_ANMR] = {
 977         search_for_quantizers_anmr,
 978         encode_window_bands_info,
 979         quantize_and_encode_band,
 980         ff_aac_encode_tns_info,
 981         ff_aac_encode_ltp_info,
 982         ff_aac_encode_main_pred,
 983         ff_aac_adjust_common_pred,
 984         ff_aac_adjust_common_ltp,
 985         ff_aac_apply_main_pred,
 986         ff_aac_apply_tns,
 987         ff_aac_update_ltp,
 988         ff_aac_ltp_insert_new_frame,
 989         set_special_band_scalefactors,
 990         search_for_pns,
 991         mark_pns,
 992         ff_aac_search_for_tns,
 993         ff_aac_search_for_ltp,
 994         search_for_ms,
 995         ff_aac_search_for_is,
 996         ff_aac_search_for_pred,
 997     },
 998     [AAC_CODER_TWOLOOP] = {
 999         search_for_quantizers_twoloop,
1000         codebook_trellis_rate,
1001         quantize_and_encode_band,
1002         ff_aac_encode_tns_info,
1003         ff_aac_encode_ltp_info,
1004         ff_aac_encode_main_pred,
1005         ff_aac_adjust_common_pred,
1006         ff_aac_adjust_common_ltp,
1007         ff_aac_apply_main_pred,
1008         ff_aac_apply_tns,
1009         ff_aac_update_ltp,
1010         ff_aac_ltp_insert_new_frame,
1011         set_special_band_scalefactors,
1012         search_for_pns,
1013         mark_pns,
1014         ff_aac_search_for_tns,
1015         ff_aac_search_for_ltp,
1016         search_for_ms,
1017         ff_aac_search_for_is,
1018         ff_aac_search_for_pred,
1019     },
1020     [AAC_CODER_FAST] = {
1021         search_for_quantizers_fast,
1022         encode_window_bands_info,
1023         quantize_and_encode_band,
1024         ff_aac_encode_tns_info,
1025         ff_aac_encode_ltp_info,
1026         ff_aac_encode_main_pred,
1027         ff_aac_adjust_common_pred,
1028         ff_aac_adjust_common_ltp,
1029         ff_aac_apply_main_pred,
1030         ff_aac_apply_tns,
1031         ff_aac_update_ltp,
1032         ff_aac_ltp_insert_new_frame,
1033         set_special_band_scalefactors,
1034         search_for_pns,
1035         mark_pns,
1036         ff_aac_search_for_tns,
1037         ff_aac_search_for_ltp,
1038         search_for_ms,
1039         ff_aac_search_for_is,
1040         ff_aac_search_for_pred,
1041     },
1042 };