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, start = 0;
 199     int minscaler_n = sce->sf_idx[0], minscaler_i = sce->sf_idx[0];
 200     int bands = 0;
 201
 202     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 203         start = 0;
 204         for (g = 0;  g < sce->ics.num_swb; g++) {
 205             if (sce->band_type[w*16+g] == INTENSITY_BT || sce->band_type[w*16+g] == INTENSITY_BT2) {
 206                 sce->sf_idx[w*16+g] = av_clip(roundf(log2f(sce->is_ener[w*16+g])*2), -155, 100);
 207                 minscaler_i = FFMIN(minscaler_i, sce->sf_idx[w*16+g]);
 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                 minscaler_n = FFMIN(minscaler_n, sce->sf_idx[w*16+g]);
 212                 bands++;
 213             }
 214             start += sce->ics.swb_sizes[g];
 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->band_type[w*16+g] == INTENSITY_BT || sce->band_type[w*16+g] == INTENSITY_BT2) {
 225                 sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], minscaler_i, minscaler_i + SCALE_MAX_DIFF);
 226             } else if (sce->band_type[w*16+g] == NOISE_BT) {
 227                 sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], minscaler_n, minscaler_n + SCALE_MAX_DIFF);
 228             }
 229         }
 230     }
 231 }
 232
 233 static void search_for_quantizers_anmr(AVCodecContext *avctx, AACEncContext *s,
 234                                        SingleChannelElement *sce,
 235                                        const float lambda)
 236 {
 237     int q, w, w2, g, start = 0;
 238     int i, j;
 239     int idx;
 240     TrellisPath paths[TRELLIS_STAGES][TRELLIS_STATES];
 241     int bandaddr[TRELLIS_STAGES];
 242     int minq;
 243     float mincost;
 244     float q0f = FLT_MAX, q1f = 0.0f, qnrgf = 0.0f;
 245     int q0, q1, qcnt = 0;
 246
 247     for (i = 0; i < 1024; i++) {
 248         float t = fabsf(sce->coeffs[i]);
 249         if (t > 0.0f) {
 250             q0f = FFMIN(q0f, t);
 251             q1f = FFMAX(q1f, t);
 252             qnrgf += t*t;
 253             qcnt++;
 254         }
 255     }
 256
 257     if (!qcnt) {
 258         memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
 259         memset(sce->zeroes, 1, sizeof(sce->zeroes));
 260         return;
 261     }
 262
 263     //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
 264     q0 = av_clip(coef2minsf(q0f), 0, SCALE_MAX_POS-1);
 265     //maximum scalefactor index is when maximum coefficient after quantizing is still not zero
 266     q1 = av_clip(coef2maxsf(q1f), 1, SCALE_MAX_POS);
 267     if (q1 - q0 > 60) {
 268         int q0low  = q0;
 269         int q1high = q1;
 270         //minimum scalefactor index is when maximum nonzero coefficient after quantizing is not clipped
 271         int qnrg = av_clip_uint8(log2f(sqrtf(qnrgf/qcnt))*4 - 31 + SCALE_ONE_POS - SCALE_DIV_512);
 272         q1 = qnrg + 30;
 273         q0 = qnrg - 30;
 274         if (q0 < q0low) {
 275             q1 += q0low - q0;
 276             q0  = q0low;
 277         } else if (q1 > q1high) {
 278             q0 -= q1 - q1high;
 279             q1  = q1high;
 280         }
 281     }
 282     // q0 == q1 isn't really a legal situation
 283     if (q0 == q1) {
 284         // the following is indirect but guarantees q1 != q0 && q1 near q0
 285         q1 = av_clip(q0+1, 1, SCALE_MAX_POS);
 286         q0 = av_clip(q1-1, 0, SCALE_MAX_POS - 1);
 287     }
 288
 289     for (i = 0; i < TRELLIS_STATES; i++) {
 290         paths[0][i].cost    = 0.0f;
 291         paths[0][i].prev    = -1;
 292     }
 293     for (j = 1; j < TRELLIS_STAGES; j++) {
 294         for (i = 0; i < TRELLIS_STATES; i++) {
 295             paths[j][i].cost    = INFINITY;
 296             paths[j][i].prev    = -2;
 297         }
 298     }
 299     idx = 1;
 300     abs_pow34_v(s->scoefs, sce->coeffs, 1024);
 301     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 302         start = w*128;
 303         for (g = 0; g < sce->ics.num_swb; g++) {
 304             const float *coefs = &sce->coeffs[start];
 305             float qmin, qmax;
 306             int nz = 0;
 307
 308             bandaddr[idx] = w * 16 + g;
 309             qmin = INT_MAX;
 310             qmax = 0.0f;
 311             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 312                 FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
 313                 if (band->energy <= band->threshold || band->threshold == 0.0f) {
 314                     sce->zeroes[(w+w2)*16+g] = 1;
 315                     continue;
 316                 }
 317                 sce->zeroes[(w+w2)*16+g] = 0;
 318                 nz = 1;
 319                 for (i = 0; i < sce->ics.swb_sizes[g]; i++) {
 320                     float t = fabsf(coefs[w2*128+i]);
 321                     if (t > 0.0f)
 322                         qmin = FFMIN(qmin, t);
 323                     qmax = FFMAX(qmax, t);
 324                 }
 325             }
 326             if (nz) {
 327                 int minscale, maxscale;
 328                 float minrd = INFINITY;
 329                 float maxval;
 330                 //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
 331                 minscale = coef2minsf(qmin);
 332                 //maximum scalefactor index is when maximum coefficient after quantizing is still not zero
 333                 maxscale = coef2maxsf(qmax);
 334                 minscale = av_clip(minscale - q0, 0, TRELLIS_STATES - 1);
 335                 maxscale = av_clip(maxscale - q0, 0, TRELLIS_STATES);
 336                 if (minscale == maxscale) {
 337                     maxscale = av_clip(minscale+1, 1, TRELLIS_STATES);
 338                     minscale = av_clip(maxscale-1, 0, TRELLIS_STATES - 1);
 339                 }
 340                 maxval = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], s->scoefs+start);
 341                 for (q = minscale; q < maxscale; q++) {
 342                     float dist = 0;
 343                     int cb = find_min_book(maxval, sce->sf_idx[w*16+g]);
 344                     for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 345                         FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
 346                         dist += quantize_band_cost(s, coefs + w2*128, s->scoefs + start + w2*128, sce->ics.swb_sizes[g],
 347                                                    q + q0, cb, lambda / band->threshold, INFINITY, NULL, NULL, 0);
 348                     }
 349                     minrd = FFMIN(minrd, dist);
 350
 351                     for (i = 0; i < q1 - q0; i++) {
 352                         float cost;
 353                         cost = paths[idx - 1][i].cost + dist
 354                                + ff_aac_scalefactor_bits[q - i + SCALE_DIFF_ZERO];
 355                         if (cost < paths[idx][q].cost) {
 356                             paths[idx][q].cost    = cost;
 357                             paths[idx][q].prev    = i;
 358                         }
 359                     }
 360                 }
 361             } else {
 362                 for (q = 0; q < q1 - q0; q++) {
 363                     paths[idx][q].cost = paths[idx - 1][q].cost + 1;
 364                     paths[idx][q].prev = q;
 365                 }
 366             }
 367             sce->zeroes[w*16+g] = !nz;
 368             start += sce->ics.swb_sizes[g];
 369             idx++;
 370         }
 371     }
 372     idx--;
 373     mincost = paths[idx][0].cost;
 374     minq    = 0;
 375     for (i = 1; i < TRELLIS_STATES; i++) {
 376         if (paths[idx][i].cost < mincost) {
 377             mincost = paths[idx][i].cost;
 378             minq = i;
 379         }
 380     }
 381     while (idx) {
 382         sce->sf_idx[bandaddr[idx]] = minq + q0;
 383         minq = FFMAX(paths[idx][minq].prev, 0);
 384         idx--;
 385     }
 386     //set the same quantizers inside window groups
 387     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
 388         for (g = 0;  g < sce->ics.num_swb; g++)
 389             for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)
 390                 sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
 391 }
 392
 393
 394 static void search_for_quantizers_faac(AVCodecContext *avctx, AACEncContext *s,
 395                                        SingleChannelElement *sce,
 396                                        const float lambda)
 397 {
 398     int start = 0, i, w, w2, g;
 399     float uplim[128], maxq[128];
 400     int minq, maxsf;
 401     float distfact = ((sce->ics.num_windows > 1) ? 85.80 : 147.84) / lambda;
 402     int last = 0, lastband = 0, curband = 0;
 403     float avg_energy = 0.0;
 404     if (sce->ics.num_windows == 1) {
 405         start = 0;
 406         for (i = 0; i < 1024; i++) {
 407             if (i - start >= sce->ics.swb_sizes[curband]) {
 408                 start += sce->ics.swb_sizes[curband];
 409                 curband++;
 410             }
 411             if (sce->coeffs[i]) {
 412                 avg_energy += sce->coeffs[i] * sce->coeffs[i];
 413                 last = i;
 414                 lastband = curband;
 415             }
 416         }
 417     } else {
 418         for (w = 0; w < 8; w++) {
 419             const float *coeffs = &sce->coeffs[w*128];
 420             curband = start = 0;
 421             for (i = 0; i < 128; i++) {
 422                 if (i - start >= sce->ics.swb_sizes[curband]) {
 423                     start += sce->ics.swb_sizes[curband];
 424                     curband++;
 425                 }
 426                 if (coeffs[i]) {
 427                     avg_energy += coeffs[i] * coeffs[i];
 428                     last = FFMAX(last, i);
 429                     lastband = FFMAX(lastband, curband);
 430                 }
 431             }
 432         }
 433     }
 434     last++;
 435     avg_energy /= last;
 436     if (avg_energy == 0.0f) {
 437         for (i = 0; i < FF_ARRAY_ELEMS(sce->sf_idx); i++)
 438             sce->sf_idx[i] = SCALE_ONE_POS;
 439         return;
 440     }
 441     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 442         start = w*128;
 443         for (g = 0; g < sce->ics.num_swb; g++) {
 444             float *coefs   = &sce->coeffs[start];
 445             const int size = sce->ics.swb_sizes[g];
 446             int start2 = start, end2 = start + size, peakpos = start;
 447             float maxval = -1, thr = 0.0f, t;
 448             maxq[w*16+g] = 0.0f;
 449             if (g > lastband) {
 450                 maxq[w*16+g] = 0.0f;
 451                 start += size;
 452                 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++)
 453                     memset(coefs + w2*128, 0, sizeof(coefs[0])*size);
 454                 continue;
 455             }
 456             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 457                 for (i = 0; i < size; i++) {
 458                     float t = coefs[w2*128+i]*coefs[w2*128+i];
 459                     maxq[w*16+g] = FFMAX(maxq[w*16+g], fabsf(coefs[w2*128 + i]));
 460                     thr += t;
 461                     if (sce->ics.num_windows == 1 && maxval < t) {
 462                         maxval  = t;
 463                         peakpos = start+i;
 464                     }
 465                 }
 466             }
 467             if (sce->ics.num_windows == 1) {
 468                 start2 = FFMAX(peakpos - 2, start2);
 469                 end2   = FFMIN(peakpos + 3, end2);
 470             } else {
 471                 start2 -= start;
 472                 end2   -= start;
 473             }
 474             start += size;
 475             thr = pow(thr / (avg_energy * (end2 - start2)), 0.3 + 0.1*(lastband - g) / lastband);
 476             t   = 1.0 - (1.0 * start2 / last);
 477             uplim[w*16+g] = distfact / (1.4 * thr + t*t*t + 0.075);
 478         }
 479     }
 480     memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
 481     abs_pow34_v(s->scoefs, sce->coeffs, 1024);
 482     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 483         start = w*128;
 484         for (g = 0;  g < sce->ics.num_swb; g++) {
 485             const float *coefs  = &sce->coeffs[start];
 486             const float *scaled = &s->scoefs[start];
 487             const int size      = sce->ics.swb_sizes[g];
 488             int scf, prev_scf, step;
 489             int min_scf = -1, max_scf = 256;
 490             float curdiff;
 491             if (maxq[w*16+g] < 21.544) {
 492                 sce->zeroes[w*16+g] = 1;
 493                 start += size;
 494                 continue;
 495             }
 496             sce->zeroes[w*16+g] = 0;
 497             scf  = prev_scf = av_clip(SCALE_ONE_POS - SCALE_DIV_512 - log2f(1/maxq[w*16+g])*16/3, 60, 218);
 498             for (;;) {
 499                 float dist = 0.0f;
 500                 int quant_max;
 501
 502                 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 503                     int b;
 504                     dist += quantize_band_cost(s, coefs + w2*128,
 505                                                scaled + w2*128,
 506                                                sce->ics.swb_sizes[g],
 507                                                scf,
 508                                                ESC_BT,
 509                                                lambda,
 510                                                INFINITY,
 511                                                &b, NULL,
 512                                                0);
 513                     dist -= b;
 514                 }
 515                 dist *= 1.0f / 512.0f / lambda;
 516                 quant_max = quant(maxq[w*16+g], ff_aac_pow2sf_tab[POW_SF2_ZERO - scf + SCALE_ONE_POS - SCALE_DIV_512], ROUND_STANDARD);
 517                 if (quant_max >= 8191) { // too much, return to the previous quantizer
 518                     sce->sf_idx[w*16+g] = prev_scf;
 519                     break;
 520                 }
 521                 prev_scf = scf;
 522                 curdiff = fabsf(dist - uplim[w*16+g]);
 523                 if (curdiff <= 1.0f)
 524                     step = 0;
 525                 else
 526                     step = log2f(curdiff);
 527                 if (dist > uplim[w*16+g])
 528                     step = -step;
 529                 scf += step;
 530                 scf = av_clip_uint8(scf);
 531                 step = scf - prev_scf;
 532                 if (FFABS(step) <= 1 || (step > 0 && scf >= max_scf) || (step < 0 && scf <= min_scf)) {
 533                     sce->sf_idx[w*16+g] = av_clip(scf, min_scf, max_scf);
 534                     break;
 535                 }
 536                 if (step > 0)
 537                     min_scf = prev_scf;
 538                 else
 539                     max_scf = prev_scf;
 540             }
 541             start += size;
 542         }
 543     }
 544     minq = sce->sf_idx[0] ? sce->sf_idx[0] : INT_MAX;
 545     for (i = 1; i < 128; i++) {
 546         if (!sce->sf_idx[i])
 547             sce->sf_idx[i] = sce->sf_idx[i-1];
 548         else
 549             minq = FFMIN(minq, sce->sf_idx[i]);
 550     }
 551     if (minq == INT_MAX)
 552         minq = 0;
 553     minq = FFMIN(minq, SCALE_MAX_POS);
 554     maxsf = FFMIN(minq + SCALE_MAX_DIFF, SCALE_MAX_POS);
 555     for (i = 126; i >= 0; i--) {
 556         if (!sce->sf_idx[i])
 557             sce->sf_idx[i] = sce->sf_idx[i+1];
 558         sce->sf_idx[i] = av_clip(sce->sf_idx[i], minq, maxsf);
 559     }
 560 }
 561
 562 static void search_for_quantizers_fast(AVCodecContext *avctx, AACEncContext *s,
 563                                        SingleChannelElement *sce,
 564                                        const float lambda)
 565 {
 566     int i, w, w2, g;
 567     int minq = 255;
 568
 569     memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
 570     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 571         for (g = 0; g < sce->ics.num_swb; g++) {
 572             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 573                 FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
 574                 if (band->energy <= band->threshold) {
 575                     sce->sf_idx[(w+w2)*16+g] = 218;
 576                     sce->zeroes[(w+w2)*16+g] = 1;
 577                 } else {
 578                     sce->sf_idx[(w+w2)*16+g] = av_clip(SCALE_ONE_POS - SCALE_DIV_512 + log2f(band->threshold), 80, 218);
 579                     sce->zeroes[(w+w2)*16+g] = 0;
 580                 }
 581                 minq = FFMIN(minq, sce->sf_idx[(w+w2)*16+g]);
 582             }
 583         }
 584     }
 585     for (i = 0; i < 128; i++) {
 586         sce->sf_idx[i] = 140;
 587         //av_clip(sce->sf_idx[i], minq, minq + SCALE_MAX_DIFF - 1);
 588     }
 589     //set the same quantizers inside window groups
 590     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
 591         for (g = 0;  g < sce->ics.num_swb; g++)
 592             for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)
 593                 sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
 594 }
 595
 596 static void search_for_pns(AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce)
 597 {
 598     FFPsyBand *band;
 599     int w, g, w2, i;
 600     int wlen = 1024 / sce->ics.num_windows;
 601     int bandwidth, cutoff;
 602     float *PNS = &s->scoefs[0*128], *PNS34 = &s->scoefs[1*128];
 603     float *NOR34 = &s->scoefs[3*128];
 604     uint8_t nextband[128];
 605     const float lambda = s->lambda;
 606     const float freq_mult = avctx->sample_rate*0.5f/wlen;
 607     const float thr_mult = NOISE_LAMBDA_REPLACE*(100.0f/lambda);
 608     const float spread_threshold = FFMIN(0.75f, NOISE_SPREAD_THRESHOLD*FFMAX(0.5f, lambda/100.f));
 609     const float dist_bias = av_clipf(4.f * 120 / lambda, 0.25f, 4.0f);
 610     const float pns_transient_energy_r = FFMIN(0.7f, lambda / 140.f);
 611
 612     int refbits = avctx->bit_rate * 1024.0 / avctx->sample_rate
 613         / ((avctx->flags & CODEC_FLAG_QSCALE) ? 2.0f : avctx->channels)
 614         * (lambda / 120.f);
 615
 616     /** Keep this in sync with twoloop's cutoff selection */
 617     float rate_bandwidth_multiplier = 1.5f;
 618     int prev = -1000, prev_sf = -1;
 619     int frame_bit_rate = (avctx->flags & CODEC_FLAG_QSCALE)
 620         ? (refbits * rate_bandwidth_multiplier * avctx->sample_rate / 1024)
 621         : (avctx->bit_rate / avctx->channels);
 622
 623     frame_bit_rate *= 1.15f;
 624
 625     if (avctx->cutoff > 0) {
 626         bandwidth = avctx->cutoff;
 627     } else {
 628         bandwidth = FFMAX(3000, AAC_CUTOFF_FROM_BITRATE(frame_bit_rate, 1, avctx->sample_rate));
 629     }
 630
 631     cutoff = bandwidth * 2 * wlen / avctx->sample_rate;
 632
 633     memcpy(sce->band_alt, sce->band_type, sizeof(sce->band_type));
 634     ff_init_nextband_map(sce, nextband);
 635     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 636         int wstart = w*128;
 637         for (g = 0;  g < sce->ics.num_swb; g++) {
 638             int noise_sfi;
 639             float dist1 = 0.0f, dist2 = 0.0f, noise_amp;
 640             float pns_energy = 0.0f, pns_tgt_energy, energy_ratio, dist_thresh;
 641             float sfb_energy = 0.0f, threshold = 0.0f, spread = 2.0f;
 642             float min_energy = -1.0f, max_energy = 0.0f;
 643             const int start = wstart+sce->ics.swb_offset[g];
 644             const float freq = (start-wstart)*freq_mult;
 645             const float freq_boost = FFMAX(0.88f*freq/NOISE_LOW_LIMIT, 1.0f);
 646             if (freq < NOISE_LOW_LIMIT || (start-wstart) >= cutoff)
 647                 continue;
 648             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 649                 band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
 650                 sfb_energy += band->energy;
 651                 spread     = FFMIN(spread, band->spread);
 652                 threshold  += band->threshold;
 653                 if (!w2) {
 654                     min_energy = max_energy = band->energy;
 655                 } else {
 656                     min_energy = FFMIN(min_energy, band->energy);
 657                     max_energy = FFMAX(max_energy, band->energy);
 658                 }
 659             }
 660
 661             /* Ramps down at ~8000Hz and loosens the dist threshold */
 662             dist_thresh = av_clipf(2.5f*NOISE_LOW_LIMIT/freq, 0.5f, 2.5f) * dist_bias;
 663
 664             /* PNS is acceptable when all of these are true:
 665              * 1. high spread energy (noise-like band)
 666              * 2. near-threshold energy (high PE means the random nature of PNS content will be noticed)
 667              * 3. on short window groups, all windows have similar energy (variations in energy would be destroyed by PNS)
 668              *
 669              * At this stage, point 2 is relaxed for zeroed bands near the noise threshold (hole avoidance is more important)
 670              */
 671             if ((!sce->zeroes[w*16+g] && !ff_sfdelta_can_remove_band(sce, nextband, prev_sf, w*16+g)) ||
 672                 ((sce->zeroes[w*16+g] || !sce->band_alt[w*16+g]) && sfb_energy < threshold*sqrtf(1.0f/freq_boost)) || spread < spread_threshold ||
 673                 (!sce->zeroes[w*16+g] && sce->band_alt[w*16+g] && sfb_energy > threshold*thr_mult*freq_boost) ||
 674                 min_energy < pns_transient_energy_r * max_energy ) {
 675                 sce->pns_ener[w*16+g] = sfb_energy;
 676                 if (!sce->zeroes[w*16+g])
 677                     prev_sf = sce->sf_idx[w*16+g];
 678                 continue;
 679             }
 680
 681             pns_tgt_energy = sfb_energy*FFMIN(1.0f, spread*spread);
 682             noise_sfi = av_clip(roundf(log2f(pns_tgt_energy)*2), -100, 155); /* Quantize */
 683             noise_amp = -ff_aac_pow2sf_tab[noise_sfi + POW_SF2_ZERO];    /* Dequantize */
 684             if (prev != -1000) {
 685                 int noise_sfdiff = noise_sfi - prev + SCALE_DIFF_ZERO;
 686                 if (noise_sfdiff < 0 || noise_sfdiff > 2*SCALE_MAX_DIFF) {
 687                     if (!sce->zeroes[w*16+g])
 688                         prev_sf = sce->sf_idx[w*16+g];
 689                     continue;
 690                 }
 691             }
 692             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 693                 float band_energy, scale, pns_senergy;
 694                 const int start_c = (w+w2)*128+sce->ics.swb_offset[g];
 695                 band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
 696                 for (i = 0; i < sce->ics.swb_sizes[g]; i+=2) {
 697                     double rnd[2];
 698                     av_bmg_get(&s->lfg, rnd);
 699                     PNS[i+0] = (float)rnd[0];
 700                     PNS[i+1] = (float)rnd[1];
 701                 }
 702                 band_energy = s->fdsp->scalarproduct_float(PNS, PNS, sce->ics.swb_sizes[g]);
 703                 scale = noise_amp/sqrtf(band_energy);
 704                 s->fdsp->vector_fmul_scalar(PNS, PNS, scale, sce->ics.swb_sizes[g]);
 705                 pns_senergy = s->fdsp->scalarproduct_float(PNS, PNS, sce->ics.swb_sizes[g]);
 706                 pns_energy += pns_senergy;
 707                 abs_pow34_v(NOR34, &sce->coeffs[start_c], sce->ics.swb_sizes[g]);
 708                 abs_pow34_v(PNS34, PNS, sce->ics.swb_sizes[g]);
 709                 dist1 += quantize_band_cost(s, &sce->coeffs[start_c],
 710                                             NOR34,
 711                                             sce->ics.swb_sizes[g],
 712                                             sce->sf_idx[(w+w2)*16+g],
 713                                             sce->band_alt[(w+w2)*16+g],
 714                                             lambda/band->threshold, INFINITY, NULL, NULL, 0);
 715                 /* Estimate rd on average as 5 bits for SF, 4 for the CB, plus spread energy * lambda/thr */
 716                 dist2 += band->energy/(band->spread*band->spread)*lambda*dist_thresh/band->threshold;
 717             }
 718             if (g && sce->band_type[w*16+g-1] == NOISE_BT) {
 719                 dist2 += 5;
 720             } else {
 721                 dist2 += 9;
 722             }
 723             energy_ratio = pns_tgt_energy/pns_energy; /* Compensates for quantization error */
 724             sce->pns_ener[w*16+g] = energy_ratio*pns_tgt_energy;
 725             if (sce->zeroes[w*16+g] || !sce->band_alt[w*16+g] || (energy_ratio > 0.85f && energy_ratio < 1.25f && dist2 < dist1)) {
 726                 sce->band_type[w*16+g] = NOISE_BT;
 727                 sce->zeroes[w*16+g] = 0;
 728                 prev = noise_sfi;
 729             } else {
 730                 if (!sce->zeroes[w*16+g])
 731                     prev_sf = sce->sf_idx[w*16+g];
 732             }
 733         }
 734     }
 735 }
 736
 737 static void mark_pns(AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce)
 738 {
 739     FFPsyBand *band;
 740     int w, g, w2;
 741     int wlen = 1024 / sce->ics.num_windows;
 742     int bandwidth, cutoff;
 743     const float lambda = s->lambda;
 744     const float freq_mult = avctx->sample_rate*0.5f/wlen;
 745     const float spread_threshold = FFMIN(0.75f, NOISE_SPREAD_THRESHOLD*FFMAX(0.5f, lambda/100.f));
 746     const float pns_transient_energy_r = FFMIN(0.7f, lambda / 140.f);
 747
 748     int refbits = avctx->bit_rate * 1024.0 / avctx->sample_rate
 749         / ((avctx->flags & CODEC_FLAG_QSCALE) ? 2.0f : avctx->channels)
 750         * (lambda / 120.f);
 751
 752     /** Keep this in sync with twoloop's cutoff selection */
 753     float rate_bandwidth_multiplier = 1.5f;
 754     int frame_bit_rate = (avctx->flags & CODEC_FLAG_QSCALE)
 755         ? (refbits * rate_bandwidth_multiplier * avctx->sample_rate / 1024)
 756         : (avctx->bit_rate / avctx->channels);
 757
 758     frame_bit_rate *= 1.15f;
 759
 760     if (avctx->cutoff > 0) {
 761         bandwidth = avctx->cutoff;
 762     } else {
 763         bandwidth = FFMAX(3000, AAC_CUTOFF_FROM_BITRATE(frame_bit_rate, 1, avctx->sample_rate));
 764     }
 765
 766     cutoff = bandwidth * 2 * wlen / avctx->sample_rate;
 767
 768     memcpy(sce->band_alt, sce->band_type, sizeof(sce->band_type));
 769     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
 770         for (g = 0;  g < sce->ics.num_swb; g++) {
 771             float sfb_energy = 0.0f, threshold = 0.0f, spread = 2.0f;
 772             float min_energy = -1.0f, max_energy = 0.0f;
 773             const int start = sce->ics.swb_offset[g];
 774             const float freq = start*freq_mult;
 775             const float freq_boost = FFMAX(0.88f*freq/NOISE_LOW_LIMIT, 1.0f);
 776             if (freq < NOISE_LOW_LIMIT || start >= cutoff) {
 777                 sce->can_pns[w*16+g] = 0;
 778                 continue;
 779             }
 780             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
 781                 band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
 782                 sfb_energy += band->energy;
 783                 spread     = FFMIN(spread, band->spread);
 784                 threshold  += band->threshold;
 785                 if (!w2) {
 786                     min_energy = max_energy = band->energy;
 787                 } else {
 788                     min_energy = FFMIN(min_energy, band->energy);
 789                     max_energy = FFMAX(max_energy, band->energy);
 790                 }
 791             }
 792
 793             /* PNS is acceptable when all of these are true:
 794              * 1. high spread energy (noise-like band)
 795              * 2. near-threshold energy (high PE means the random nature of PNS content will be noticed)
 796              * 3. on short window groups, all windows have similar energy (variations in energy would be destroyed by PNS)
 797              */
 798             sce->pns_ener[w*16+g] = sfb_energy;
 799             if (sfb_energy < threshold*sqrtf(1.5f/freq_boost) || spread < spread_threshold || min_energy < pns_transient_energy_r * max_energy) {
 800                 sce->can_pns[w*16+g] = 0;
 801             } else {
 802                 sce->can_pns[w*16+g] = 1;
 803             }
 804         }
 805     }
 806 }
 807
 808 static void search_for_ms(AACEncContext *s, ChannelElement *cpe)
 809 {
 810     int start = 0, i, w, w2, g, sid_sf_boost, prev_mid, prev_side;
 811     uint8_t nextband0[128], nextband1[128];
 812     float M[128], S[128];
 813     float *L34 = s->scoefs, *R34 = s->scoefs + 128, *M34 = s->scoefs + 128*2, *S34 = s->scoefs + 128*3;
 814     const float lambda = s->lambda;
 815     const float mslambda = FFMIN(1.0f, lambda / 120.f);
 816     SingleChannelElement *sce0 = &cpe->ch[0];
 817     SingleChannelElement *sce1 = &cpe->ch[1];
 818     if (!cpe->common_window)
 819         return;
 820
 821     /** Scout out next nonzero bands */
 822     ff_init_nextband_map(sce0, nextband0);
 823     ff_init_nextband_map(sce1, nextband1);
 824
 825     prev_mid = sce0->sf_idx[0];
 826     prev_side = sce1->sf_idx[0];
 827     for (w = 0; w < sce0->ics.num_windows; w += sce0->ics.group_len[w]) {
 828         start = 0;
 829         for (g = 0;  g < sce0->ics.num_swb; g++) {
 830             float bmax = bval2bmax(g * 17.0f / sce0->ics.num_swb) / 0.0045f;
 831             cpe->ms_mask[w*16+g] = 0;
 832             if (!sce0->zeroes[w*16+g] && !sce1->zeroes[w*16+g]) {
 833                 float Mmax = 0.0f, Smax = 0.0f;
 834
 835                 /* Must compute mid/side SF and book for the whole window group */
 836                 for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {
 837                     for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {
 838                         M[i] = (sce0->coeffs[start+(w+w2)*128+i]
 839                               + sce1->coeffs[start+(w+w2)*128+i]) * 0.5;
 840                         S[i] =  M[i]
 841                               - sce1->coeffs[start+(w+w2)*128+i];
 842                     }
 843                     abs_pow34_v(M34, M, sce0->ics.swb_sizes[g]);
 844                     abs_pow34_v(S34, S, sce0->ics.swb_sizes[g]);
 845                     for (i = 0; i < sce0->ics.swb_sizes[g]; i++ ) {
 846                         Mmax = FFMAX(Mmax, M34[i]);
 847                         Smax = FFMAX(Smax, S34[i]);
 848                     }
 849                 }
 850
 851                 for (sid_sf_boost = 0; sid_sf_boost < 4; sid_sf_boost++) {
 852                     float dist1 = 0.0f, dist2 = 0.0f;
 853                     int B0 = 0, B1 = 0;
 854                     int minidx;
 855                     int mididx, sididx;
 856                     int midcb, sidcb;
 857
 858                     minidx = FFMIN(sce0->sf_idx[w*16+g], sce1->sf_idx[w*16+g]);
 859                     mididx = av_clip(minidx, 0, SCALE_MAX_POS - SCALE_DIV_512);
 860                     sididx = av_clip(minidx - sid_sf_boost * 3, 0, SCALE_MAX_POS - SCALE_DIV_512);
 861                     if (!cpe->is_mask[w*16+g] && sce0->band_type[w*16+g] != NOISE_BT && sce1->band_type[w*16+g] != NOISE_BT
 862                         && (   !ff_sfdelta_can_replace(sce0, nextband0, prev_mid, mididx, w*16+g)
 863                             || !ff_sfdelta_can_replace(sce1, nextband1, prev_side, sididx, w*16+g))) {
 864                         /* scalefactor range violation, bad stuff, will decrease quality unacceptably */
 865                         continue;
 866                     }
 867
 868                     midcb = find_min_book(Mmax, mididx);
 869                     sidcb = find_min_book(Smax, sididx);
 870
 871                     /* No CB can be zero */
 872                     midcb = FFMAX(1,midcb);
 873                     sidcb = FFMAX(1,sidcb);
 874
 875                     for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {
 876                         FFPsyBand *band0 = &s->psy.ch[s->cur_channel+0].psy_bands[(w+w2)*16+g];
 877                         FFPsyBand *band1 = &s->psy.ch[s->cur_channel+1].psy_bands[(w+w2)*16+g];
 878                         float minthr = FFMIN(band0->threshold, band1->threshold);
 879                         int b1,b2,b3,b4;
 880                         for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {
 881                             M[i] = (sce0->coeffs[start+(w+w2)*128+i]
 882                                   + sce1->coeffs[start+(w+w2)*128+i]) * 0.5;
 883                             S[i] =  M[i]
 884                                   - sce1->coeffs[start+(w+w2)*128+i];
 885                         }
 886
 887                         abs_pow34_v(L34, sce0->coeffs+start+(w+w2)*128, sce0->ics.swb_sizes[g]);
 888                         abs_pow34_v(R34, sce1->coeffs+start+(w+w2)*128, sce0->ics.swb_sizes[g]);
 889                         abs_pow34_v(M34, M,                         sce0->ics.swb_sizes[g]);
 890                         abs_pow34_v(S34, S,                         sce0->ics.swb_sizes[g]);
 891                         dist1 += quantize_band_cost(s, &sce0->coeffs[start + (w+w2)*128],
 892                                                     L34,
 893                                                     sce0->ics.swb_sizes[g],
 894                                                     sce0->sf_idx[(w+w2)*16+g],
 895                                                     sce0->band_type[(w+w2)*16+g],
 896                                                     lambda / band0->threshold, INFINITY, &b1, NULL, 0);
 897                         dist1 += quantize_band_cost(s, &sce1->coeffs[start + (w+w2)*128],
 898                                                     R34,
 899                                                     sce1->ics.swb_sizes[g],
 900                                                     sce1->sf_idx[(w+w2)*16+g],
 901                                                     sce1->band_type[(w+w2)*16+g],
 902                                                     lambda / band1->threshold, INFINITY, &b2, NULL, 0);
 903                         dist2 += quantize_band_cost(s, M,
 904                                                     M34,
 905                                                     sce0->ics.swb_sizes[g],
 906                                                     sce0->sf_idx[(w+w2)*16+g],
 907                                                     sce0->band_type[(w+w2)*16+g],
 908                                                     lambda / minthr, INFINITY, &b3, NULL, 0);
 909                         dist2 += quantize_band_cost(s, S,
 910                                                     S34,
 911                                                     sce1->ics.swb_sizes[g],
 912                                                     sce1->sf_idx[(w+w2)*16+g],
 913                                                     sce1->band_type[(w+w2)*16+g],
 914                                                     mslambda / (minthr * bmax), INFINITY, &b4, NULL, 0);
 915                         B0 += b1+b2;
 916                         B1 += b3+b4;
 917                         dist1 -= B0;
 918                         dist2 -= B1;
 919                     }
 920                     cpe->ms_mask[w*16+g] = dist2 <= dist1 && B1 < B0;
 921                     if (cpe->ms_mask[w*16+g]) {
 922                         /* Setting the M/S mask is useful with I/S or PNS, but only the flag */
 923                         if (!cpe->is_mask[w*16+g] && sce0->band_type[w*16+g] != NOISE_BT && sce1->band_type[w*16+g] != NOISE_BT) {
 924                             sce0->sf_idx[w*16+g] = mididx;
 925                             sce1->sf_idx[w*16+g] = sididx;
 926                             sce0->band_type[w*16+g] = midcb;
 927                             sce1->band_type[w*16+g] = sidcb;
 928                         }
 929                         break;
 930                     } else if (B1 > B0) {
 931                         /* More boost won't fix this */
 932                         break;
 933                     }
 934                 }
 935             }
 936             if (!sce0->zeroes[w*16+g] && sce0->band_type[w*16+g] < RESERVED_BT)
 937                 prev_mid = sce0->sf_idx[w*16+g];
 938             if (!sce1->zeroes[w*16+g] && !cpe->is_mask[w*16+g] && sce1->band_type[w*16+g] < RESERVED_BT)
 939                 prev_side = sce1->sf_idx[w*16+g];
 940             start += sce0->ics.swb_sizes[g];
 941         }
 942     }
 943 }
 944
 945 AACCoefficientsEncoder ff_aac_coders[AAC_CODER_NB] = {
 946     [AAC_CODER_FAAC] = {
 947         search_for_quantizers_faac,
 948         encode_window_bands_info,
 949         quantize_and_encode_band,
 950         ff_aac_encode_tns_info,
 951         ff_aac_encode_ltp_info,
 952         ff_aac_encode_main_pred,
 953         ff_aac_adjust_common_pred,
 954         ff_aac_adjust_common_ltp,
 955         ff_aac_apply_main_pred,
 956         ff_aac_apply_tns,
 957         ff_aac_update_ltp,
 958         ff_aac_ltp_insert_new_frame,
 959         set_special_band_scalefactors,
 960         search_for_pns,
 961         mark_pns,
 962         ff_aac_search_for_tns,
 963         ff_aac_search_for_ltp,
 964         search_for_ms,
 965         ff_aac_search_for_is,
 966         ff_aac_search_for_pred,
 967     },
 968     [AAC_CODER_ANMR] = {
 969         search_for_quantizers_anmr,
 970         encode_window_bands_info,
 971         quantize_and_encode_band,
 972         ff_aac_encode_tns_info,
 973         ff_aac_encode_ltp_info,
 974         ff_aac_encode_main_pred,
 975         ff_aac_adjust_common_pred,
 976         ff_aac_adjust_common_ltp,
 977         ff_aac_apply_main_pred,
 978         ff_aac_apply_tns,
 979         ff_aac_update_ltp,
 980         ff_aac_ltp_insert_new_frame,
 981         set_special_band_scalefactors,
 982         search_for_pns,
 983         mark_pns,
 984         ff_aac_search_for_tns,
 985         ff_aac_search_for_ltp,
 986         search_for_ms,
 987         ff_aac_search_for_is,
 988         ff_aac_search_for_pred,
 989     },
 990     [AAC_CODER_TWOLOOP] = {
 991         search_for_quantizers_twoloop,
 992         codebook_trellis_rate,
 993         quantize_and_encode_band,
 994         ff_aac_encode_tns_info,
 995         ff_aac_encode_ltp_info,
 996         ff_aac_encode_main_pred,
 997         ff_aac_adjust_common_pred,
 998         ff_aac_adjust_common_ltp,
 999         ff_aac_apply_main_pred,
1000         ff_aac_apply_tns,
1001         ff_aac_update_ltp,
1002         ff_aac_ltp_insert_new_frame,
1003         set_special_band_scalefactors,
1004         search_for_pns,
1005         mark_pns,
1006         ff_aac_search_for_tns,
1007         ff_aac_search_for_ltp,
1008         search_for_ms,
1009         ff_aac_search_for_is,
1010         ff_aac_search_for_pred,
1011     },
1012     [AAC_CODER_FAST] = {
1013         search_for_quantizers_fast,
1014         encode_window_bands_info,
1015         quantize_and_encode_band,
1016         ff_aac_encode_tns_info,
1017         ff_aac_encode_ltp_info,
1018         ff_aac_encode_main_pred,
1019         ff_aac_adjust_common_pred,
1020         ff_aac_adjust_common_ltp,
1021         ff_aac_apply_main_pred,
1022         ff_aac_apply_tns,
1023         ff_aac_update_ltp,
1024         ff_aac_ltp_insert_new_frame,
1025         set_special_band_scalefactors,
1026         search_for_pns,
1027         mark_pns,
1028         ff_aac_search_for_tns,
1029         ff_aac_search_for_ltp,
1030         search_for_ms,
1031         ff_aac_search_for_is,
1032         ff_aac_search_for_pred,
1033     },
1034 };