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FFmpeg/libavcodec/aaccoder.c

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  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. #include "libavutil/mathematics.h"

  37. #include "avcodec.h"

  38. #include "put_bits.h"

  39. #include "aac.h"

  40. #include "aacenc.h"

  41. #include "aactab.h"

  42. #include "aacenctab.h"

  43. #include "aacenc_utils.h"

  44. #include "aacenc_quantization.h"

  45. #include "aac_tablegen_decl.h"

  46. 

  47. #include "aacenc_is.h"

  48. #include "aacenc_tns.h"

  49. #include "aacenc_pred.h"

  50. 

  51. /** Frequency in Hz for lower limit of noise substitution **/

  52. #define NOISE_LOW_LIMIT 4500

  53. 

  54. /* Energy spread threshold value below which no PNS is used, this corresponds to

  55.  * typically around 17Khz, after which PNS usage decays ending at 19Khz */

  56. #define NOISE_SPREAD_THRESHOLD 0.5f

  57. 

  58. /* This constant gets divided by lambda to return ~1.65 which when multiplied

  59.  * by the band->threshold and compared to band->energy is the boundary between

  60.  * excessive PNS and little PNS usage. */

  61. #define NOISE_LAMBDA_NUMERATOR 252.1f

  62. 

  63. /**

  64.  * structure used in optimal codebook search

  65.  */

  66. typedef struct BandCodingPath {

  67.     int prev_idx; ///< pointer to the previous path point

  68.     float cost;   ///< path cost

  69.     int run;

  70. } BandCodingPath;

  71. 

  72. /**

  73.  * Encode band info for single window group bands.

  74.  */

  75. static void encode_window_bands_info(AACEncContext *s, SingleChannelElement *sce,

  76.                                      int win, int group_len, const float lambda)

  77. {

  78.     BandCodingPath path[120][CB_TOT_ALL];

  79.     int w, swb, cb, start, size;

  80.     int i, j;

  81.     const int max_sfb  = sce->ics.max_sfb;

  82.     const int run_bits = sce->ics.num_windows == 1 ? 5 : 3;

  83.     const int run_esc  = (1 << run_bits) - 1;

  84.     int idx, ppos, count;

  85.     int stackrun[120], stackcb[120], stack_len;

  86.     float next_minrd = INFINITY;

  87.     int next_mincb = 0;

  88. 

  89.     abs_pow34_v(s->scoefs, sce->coeffs, 1024);

  90.     start = win*128;

  91.     for (cb = 0; cb < CB_TOT_ALL; cb++) {

  92.         path[0][cb].cost     = 0.0f;

  93.         path[0][cb].prev_idx = -1;

  94.         path[0][cb].run      = 0;

  95.     }

  96.     for (swb = 0; swb < max_sfb; swb++) {

  97.         size = sce->ics.swb_sizes[swb];

  98.         if (sce->zeroes[win*16 + swb]) {

  99.             for (cb = 0; cb < CB_TOT_ALL; cb++) {

  100.                 path[swb+1][cb].prev_idx = cb;

  101.                 path[swb+1][cb].cost     = path[swb][cb].cost;

  102.                 path[swb+1][cb].run      = path[swb][cb].run + 1;

  103.             }

  104.         } else {

  105.             float minrd = next_minrd;

  106.             int mincb = next_mincb;

  107.             next_minrd = INFINITY;

  108.             next_mincb = 0;

  109.             for (cb = 0; cb < CB_TOT_ALL; cb++) {

  110.                 float cost_stay_here, cost_get_here;

  111.                 float rd = 0.0f;

  112.                 if (cb >= 12 && sce->band_type[win*16+swb] < aac_cb_out_map[cb] ||

  113.                     cb  < aac_cb_in_map[sce->band_type[win*16+swb]] && sce->band_type[win*16+swb] > aac_cb_out_map[cb]) {

  114.                     path[swb+1][cb].prev_idx = -1;

  115.                     path[swb+1][cb].cost     = INFINITY;

  116.                     path[swb+1][cb].run      = path[swb][cb].run + 1;

  117.                     continue;

  118.                 }

  119.                 for (w = 0; w < group_len; w++) {

  120.                     FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(win+w)*16+swb];

  121.                     rd += quantize_band_cost(s, &sce->coeffs[start + w*128],

  122.                                              &s->scoefs[start + w*128], size,

  123.                                              sce->sf_idx[(win+w)*16+swb], aac_cb_out_map[cb],

  124.                                              lambda / band->threshold, INFINITY, NULL, 0);

  125.                 }

  126.                 cost_stay_here = path[swb][cb].cost + rd;

  127.                 cost_get_here  = minrd              + rd + run_bits + 4;

  128.                 if (   run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run]

  129.                     != run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run+1])

  130.                     cost_stay_here += run_bits;

  131.                 if (cost_get_here < cost_stay_here) {

  132.                     path[swb+1][cb].prev_idx = mincb;

  133.                     path[swb+1][cb].cost     = cost_get_here;

  134.                     path[swb+1][cb].run      = 1;

  135.                 } else {

  136.                     path[swb+1][cb].prev_idx = cb;

  137.                     path[swb+1][cb].cost     = cost_stay_here;

  138.                     path[swb+1][cb].run      = path[swb][cb].run + 1;

  139.                 }

  140.                 if (path[swb+1][cb].cost < next_minrd) {

  141.                     next_minrd = path[swb+1][cb].cost;

  142.                     next_mincb = cb;

  143.                 }

  144.             }

  145.         }

  146.         start += sce->ics.swb_sizes[swb];

  147.     }

  148. 

  149.     //convert resulting path from backward-linked list

  150.     stack_len = 0;

  151.     idx       = 0;

  152.     for (cb = 1; cb < CB_TOT_ALL; cb++)

  153.         if (path[max_sfb][cb].cost < path[max_sfb][idx].cost)

  154.             idx = cb;

  155.     ppos = max_sfb;

  156.     while (ppos > 0) {

  157.         av_assert1(idx >= 0);

  158.         cb = idx;

  159.         stackrun[stack_len] = path[ppos][cb].run;

  160.         stackcb [stack_len] = cb;

  161.         idx = path[ppos-path[ppos][cb].run+1][cb].prev_idx;

  162.         ppos -= path[ppos][cb].run;

  163.         stack_len++;

  164.     }

  165.     //perform actual band info encoding

  166.     start = 0;

  167.     for (i = stack_len - 1; i >= 0; i--) {

  168.         cb = aac_cb_out_map[stackcb[i]];

  169.         put_bits(&s->pb, 4, cb);

  170.         count = stackrun[i];

  171.         memset(sce->zeroes + win*16 + start, !cb, count);

  172.         //XXX: memset when band_type is also uint8_t

  173.         for (j = 0; j < count; j++) {

  174.             sce->band_type[win*16 + start] = cb;

  175.             start++;

  176.         }

  177.         while (count >= run_esc) {

  178.             put_bits(&s->pb, run_bits, run_esc);

  179.             count -= run_esc;

  180.         }

  181.         put_bits(&s->pb, run_bits, count);

  182.     }

  183. }

  184. 

  185. static void codebook_trellis_rate(AACEncContext *s, SingleChannelElement *sce,

  186.                                   int win, int group_len, const float lambda)

  187. {

  188.     BandCodingPath path[120][CB_TOT_ALL];

  189.     int w, swb, cb, start, size;

  190.     int i, j;

  191.     const int max_sfb  = sce->ics.max_sfb;

  192.     const int run_bits = sce->ics.num_windows == 1 ? 5 : 3;

  193.     const int run_esc  = (1 << run_bits) - 1;

  194.     int idx, ppos, count;

  195.     int stackrun[120], stackcb[120], stack_len;

  196.     float next_minbits = INFINITY;

  197.     int next_mincb = 0;

  198. 

  199.     abs_pow34_v(s->scoefs, sce->coeffs, 1024);

  200.     start = win*128;

  201.     for (cb = 0; cb < CB_TOT_ALL; cb++) {

  202.         path[0][cb].cost     = run_bits+4;

  203.         path[0][cb].prev_idx = -1;

  204.         path[0][cb].run      = 0;

  205.     }

  206.     for (swb = 0; swb < max_sfb; swb++) {

  207.         size = sce->ics.swb_sizes[swb];

  208.         if (sce->zeroes[win*16 + swb]) {

  209.             float cost_stay_here = path[swb][0].cost;

  210.             float cost_get_here  = next_minbits + run_bits + 4;

  211.             if (   run_value_bits[sce->ics.num_windows == 8][path[swb][0].run]

  212.                 != run_value_bits[sce->ics.num_windows == 8][path[swb][0].run+1])

  213.                 cost_stay_here += run_bits;

  214.             if (cost_get_here < cost_stay_here) {

  215.                 path[swb+1][0].prev_idx = next_mincb;

  216.                 path[swb+1][0].cost     = cost_get_here;

  217.                 path[swb+1][0].run      = 1;

  218.             } else {

  219.                 path[swb+1][0].prev_idx = 0;

  220.                 path[swb+1][0].cost     = cost_stay_here;

  221.                 path[swb+1][0].run      = path[swb][0].run + 1;

  222.             }

  223.             next_minbits = path[swb+1][0].cost;

  224.             next_mincb = 0;

  225.             for (cb = 1; cb < CB_TOT_ALL; cb++) {

  226.                 path[swb+1][cb].cost = 61450;

  227.                 path[swb+1][cb].prev_idx = -1;

  228.                 path[swb+1][cb].run = 0;

  229.             }

  230.         } else {

  231.             float minbits = next_minbits;

  232.             int mincb = next_mincb;

  233.             int startcb = sce->band_type[win*16+swb];

  234.             startcb = aac_cb_in_map[startcb];

  235.             next_minbits = INFINITY;

  236.             next_mincb = 0;

  237.             for (cb = 0; cb < startcb; cb++) {

  238.                 path[swb+1][cb].cost = 61450;

  239.                 path[swb+1][cb].prev_idx = -1;

  240.                 path[swb+1][cb].run = 0;

  241.             }

  242.             for (cb = startcb; cb < CB_TOT_ALL; cb++) {

  243.                 float cost_stay_here, cost_get_here;

  244.                 float bits = 0.0f;

  245.                 if (cb >= 12 && sce->band_type[win*16+swb] != aac_cb_out_map[cb]) {

  246.                     path[swb+1][cb].cost = 61450;

  247.                     path[swb+1][cb].prev_idx = -1;

  248.                     path[swb+1][cb].run = 0;

  249.                     continue;

  250.                 }

  251.                 for (w = 0; w < group_len; w++) {

  252.                     bits += quantize_band_cost(s, &sce->coeffs[start + w*128],

  253.                                                &s->scoefs[start + w*128], size,

  254.                                                sce->sf_idx[win*16+swb],

  255.                                                aac_cb_out_map[cb],

  256.                                                0, INFINITY, NULL, 0);

  257.                 }

  258.                 cost_stay_here = path[swb][cb].cost + bits;

  259.                 cost_get_here  = minbits            + bits + run_bits + 4;

  260.                 if (   run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run]

  261.                     != run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run+1])

  262.                     cost_stay_here += run_bits;

  263.                 if (cost_get_here < cost_stay_here) {

  264.                     path[swb+1][cb].prev_idx = mincb;

  265.                     path[swb+1][cb].cost     = cost_get_here;

  266.                     path[swb+1][cb].run      = 1;

  267.                 } else {

  268.                     path[swb+1][cb].prev_idx = cb;

  269.                     path[swb+1][cb].cost     = cost_stay_here;

  270.                     path[swb+1][cb].run      = path[swb][cb].run + 1;

  271.                 }

  272.                 if (path[swb+1][cb].cost < next_minbits) {

  273.                     next_minbits = path[swb+1][cb].cost;

  274.                     next_mincb = cb;

  275.                 }

  276.             }

  277.         }

  278.         start += sce->ics.swb_sizes[swb];

  279.     }

  280. 

  281.     //convert resulting path from backward-linked list

  282.     stack_len = 0;

  283.     idx       = 0;

  284.     for (cb = 1; cb < CB_TOT_ALL; cb++)

  285.         if (path[max_sfb][cb].cost < path[max_sfb][idx].cost)

  286.             idx = cb;

  287.     ppos = max_sfb;

  288.     while (ppos > 0) {

  289.         av_assert1(idx >= 0);

  290.         cb = idx;

  291.         stackrun[stack_len] = path[ppos][cb].run;

  292.         stackcb [stack_len] = cb;

  293.         idx = path[ppos-path[ppos][cb].run+1][cb].prev_idx;

  294.         ppos -= path[ppos][cb].run;

  295.         stack_len++;

  296.     }

  297.     //perform actual band info encoding

  298.     start = 0;

  299.     for (i = stack_len - 1; i >= 0; i--) {

  300.         cb = aac_cb_out_map[stackcb[i]];

  301.         put_bits(&s->pb, 4, cb);

  302.         count = stackrun[i];

  303.         memset(sce->zeroes + win*16 + start, !cb, count);

  304.         //XXX: memset when band_type is also uint8_t

  305.         for (j = 0; j < count; j++) {

  306.             sce->band_type[win*16 + start] = cb;

  307.             start++;

  308.         }

  309.         while (count >= run_esc) {

  310.             put_bits(&s->pb, run_bits, run_esc);

  311.             count -= run_esc;

  312.         }

  313.         put_bits(&s->pb, run_bits, count);

  314.     }

  315. }

  316. 

  317. typedef struct TrellisPath {

  318.     float cost;

  319.     int prev;

  320. } TrellisPath;

  321. 

  322. #define TRELLIS_STAGES 121

  323. #define TRELLIS_STATES (SCALE_MAX_DIFF+1)

  324. 

  325. static void set_special_band_scalefactors(AACEncContext *s, SingleChannelElement *sce)

  326. {

  327.     int w, g, start = 0;

  328.     int minscaler_n = sce->sf_idx[0], minscaler_i = sce->sf_idx[0];

  329.     int bands = 0;

  330. 

  331.     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {

  332.         start = 0;

  333.         for (g = 0;  g < sce->ics.num_swb; g++) {

  334.             if (sce->band_type[w*16+g] == INTENSITY_BT || sce->band_type[w*16+g] == INTENSITY_BT2) {

  335.                 sce->sf_idx[w*16+g] = av_clip(ceilf(log2f(sce->is_ener[w*16+g])*2), -155, 100);

  336.                 minscaler_i = FFMIN(minscaler_i, sce->sf_idx[w*16+g]);

  337.                 bands++;

  338.             } else if (sce->band_type[w*16+g] == NOISE_BT) {

  339.                 sce->sf_idx[w*16+g] = av_clip(4+log2f(sce->pns_ener[w*16+g])*2, -100, 155);

  340.                 minscaler_n = FFMIN(minscaler_n, sce->sf_idx[w*16+g]);

  341.                 bands++;

  342.             }

  343.             start += sce->ics.swb_sizes[g];

  344.         }

  345.     }

  346. 

  347.     if (!bands)

  348.         return;

  349. 

  350.     /* Clip the scalefactor indices */

  351.     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {

  352.         for (g = 0;  g < sce->ics.num_swb; g++) {

  353.             if (sce->band_type[w*16+g] == INTENSITY_BT || sce->band_type[w*16+g] == INTENSITY_BT2) {

  354.                 sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], minscaler_i, minscaler_i + SCALE_MAX_DIFF);

  355.             } else if (sce->band_type[w*16+g] == NOISE_BT) {

  356.                 sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], minscaler_n, minscaler_n + SCALE_MAX_DIFF);

  357.             }

  358.         }

  359.     }

  360. }

  361. 

  362. static void search_for_quantizers_anmr(AVCodecContext *avctx, AACEncContext *s,

  363.                                        SingleChannelElement *sce,

  364.                                        const float lambda)

  365. {

  366.     int q, w, w2, g, start = 0;

  367.     int i, j;

  368.     int idx;

  369.     TrellisPath paths[TRELLIS_STAGES][TRELLIS_STATES];

  370.     int bandaddr[TRELLIS_STAGES];

  371.     int minq;

  372.     float mincost;

  373.     float q0f = FLT_MAX, q1f = 0.0f, qnrgf = 0.0f;

  374.     int q0, q1, qcnt = 0;

  375. 

  376.     for (i = 0; i < 1024; i++) {

  377.         float t = fabsf(sce->coeffs[i]);

  378.         if (t > 0.0f) {

  379.             q0f = FFMIN(q0f, t);

  380.             q1f = FFMAX(q1f, t);

  381.             qnrgf += t*t;

  382.             qcnt++;

  383.         }

  384.     }

  385. 

  386.     if (!qcnt) {

  387.         memset(sce->sf_idx, 0, sizeof(sce->sf_idx));

  388.         memset(sce->zeroes, 1, sizeof(sce->zeroes));

  389.         return;

  390.     }

  391. 

  392.     //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped

  393.     q0 = coef2minsf(q0f);

  394.     //maximum scalefactor index is when maximum coefficient after quantizing is still not zero

  395.     q1 = coef2maxsf(q1f);

  396.     if (q1 - q0 > 60) {

  397.         int q0low  = q0;

  398.         int q1high = q1;

  399.         //minimum scalefactor index is when maximum nonzero coefficient after quantizing is not clipped

  400.         int qnrg = av_clip_uint8(log2f(sqrtf(qnrgf/qcnt))*4 - 31 + SCALE_ONE_POS - SCALE_DIV_512);

  401.         q1 = qnrg + 30;

  402.         q0 = qnrg - 30;

  403.         if (q0 < q0low) {

  404.             q1 += q0low - q0;

  405.             q0  = q0low;

  406.         } else if (q1 > q1high) {

  407.             q0 -= q1 - q1high;

  408.             q1  = q1high;

  409.         }

  410.     }

  411. 

  412.     for (i = 0; i < TRELLIS_STATES; i++) {

  413.         paths[0][i].cost    = 0.0f;

  414.         paths[0][i].prev    = -1;

  415.     }

  416.     for (j = 1; j < TRELLIS_STAGES; j++) {

  417.         for (i = 0; i < TRELLIS_STATES; i++) {

  418.             paths[j][i].cost    = INFINITY;

  419.             paths[j][i].prev    = -2;

  420.         }

  421.     }

  422.     idx = 1;

  423.     abs_pow34_v(s->scoefs, sce->coeffs, 1024);

  424.     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {

  425.         start = w*128;

  426.         for (g = 0; g < sce->ics.num_swb; g++) {

  427.             const float *coefs = &sce->coeffs[start];

  428.             float qmin, qmax;

  429.             int nz = 0;

  430. 

  431.             bandaddr[idx] = w * 16 + g;

  432.             qmin = INT_MAX;

  433.             qmax = 0.0f;

  434.             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {

  435.                 FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];

  436.                 if (band->energy <= band->threshold || band->threshold == 0.0f) {

  437.                     sce->zeroes[(w+w2)*16+g] = 1;

  438.                     continue;

  439.                 }

  440.                 sce->zeroes[(w+w2)*16+g] = 0;

  441.                 nz = 1;

  442.                 for (i = 0; i < sce->ics.swb_sizes[g]; i++) {

  443.                     float t = fabsf(coefs[w2*128+i]);

  444.                     if (t > 0.0f)

  445.                         qmin = FFMIN(qmin, t);

  446.                     qmax = FFMAX(qmax, t);

  447.                 }

  448.             }

  449.             if (nz) {

  450.                 int minscale, maxscale;

  451.                 float minrd = INFINITY;

  452.                 float maxval;

  453.                 //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped

  454.                 minscale = coef2minsf(qmin);

  455.                 //maximum scalefactor index is when maximum coefficient after quantizing is still not zero

  456.                 maxscale = coef2maxsf(qmax);

  457.                 minscale = av_clip(minscale - q0, 0, TRELLIS_STATES - 1);

  458.                 maxscale = av_clip(maxscale - q0, 0, TRELLIS_STATES);

  459.                 maxval = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], s->scoefs+start);

  460.                 for (q = minscale; q < maxscale; q++) {

  461.                     float dist = 0;

  462.                     int cb = find_min_book(maxval, sce->sf_idx[w*16+g]);

  463.                     for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {

  464.                         FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];

  465.                         dist += quantize_band_cost(s, coefs + w2*128, s->scoefs + start + w2*128, sce->ics.swb_sizes[g],

  466.                                                    q + q0, cb, lambda / band->threshold, INFINITY, NULL, 0);

  467.                     }

  468.                     minrd = FFMIN(minrd, dist);

  469. 

  470.                     for (i = 0; i < q1 - q0; i++) {

  471.                         float cost;

  472.                         cost = paths[idx - 1][i].cost + dist

  473.                                + ff_aac_scalefactor_bits[q - i + SCALE_DIFF_ZERO];

  474.                         if (cost < paths[idx][q].cost) {

  475.                             paths[idx][q].cost    = cost;

  476.                             paths[idx][q].prev    = i;

  477.                         }

  478.                     }

  479.                 }

  480.             } else {

  481.                 for (q = 0; q < q1 - q0; q++) {

  482.                     paths[idx][q].cost = paths[idx - 1][q].cost + 1;

  483.                     paths[idx][q].prev = q;

  484.                 }

  485.             }

  486.             sce->zeroes[w*16+g] = !nz;

  487.             start += sce->ics.swb_sizes[g];

  488.             idx++;

  489.         }

  490.     }

  491.     idx--;

  492.     mincost = paths[idx][0].cost;

  493.     minq    = 0;

  494.     for (i = 1; i < TRELLIS_STATES; i++) {

  495.         if (paths[idx][i].cost < mincost) {

  496.             mincost = paths[idx][i].cost;

  497.             minq = i;

  498.         }

  499.     }

  500.     while (idx) {

  501.         sce->sf_idx[bandaddr[idx]] = minq + q0;

  502.         minq = paths[idx][minq].prev;

  503.         idx--;

  504.     }

  505.     //set the same quantizers inside window groups

  506.     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])

  507.         for (g = 0;  g < sce->ics.num_swb; g++)

  508.             for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)

  509.                 sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];

  510. }

  511. 

  512. /**

  513.  * two-loop quantizers search taken from ISO 13818-7 Appendix C

  514.  */

  515. static void search_for_quantizers_twoloop(AVCodecContext *avctx,

  516.                                           AACEncContext *s,

  517.                                           SingleChannelElement *sce,

  518.                                           const float lambda)

  519. {

  520.     int start = 0, i, w, w2, g;

  521.     int destbits = avctx->bit_rate * 1024.0 / avctx->sample_rate / avctx->channels * (lambda / 120.f);

  522.     float dists[128] = { 0 }, uplims[128] = { 0 };

  523.     float maxvals[128];

  524.     int fflag, minscaler;

  525.     int its  = 0;

  526.     int allz = 0;

  527.     float minthr = INFINITY;

  528. 

  529.     // for values above this the decoder might end up in an endless loop

  530.     // due to always having more bits than what can be encoded.

  531.     destbits = FFMIN(destbits, 5800);

  532.     //XXX: some heuristic to determine initial quantizers will reduce search time

  533.     //determine zero bands and upper limits

  534.     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {

  535.         for (g = 0;  g < sce->ics.num_swb; g++) {

  536.             int nz = 0;

  537.             float uplim = 0.0f, energy = 0.0f;

  538.             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {

  539.                 FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];

  540.                 uplim  += band->threshold;

  541.                 energy += band->energy;

  542.                 if (band->energy <= band->threshold || band->threshold == 0.0f) {

  543.                     sce->zeroes[(w+w2)*16+g] = 1;

  544.                     continue;

  545.                 }

  546.                 nz = 1;

  547.             }

  548.             uplims[w*16+g] = uplim *512;

  549.             sce->zeroes[w*16+g] = !nz;

  550.             if (nz)

  551.                 minthr = FFMIN(minthr, uplim);

  552.             allz |= nz;

  553.         }

  554.     }

  555.     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {

  556.         for (g = 0;  g < sce->ics.num_swb; g++) {

  557.             if (sce->zeroes[w*16+g]) {

  558.                 sce->sf_idx[w*16+g] = SCALE_ONE_POS;

  559.                 continue;

  560.             }

  561.             sce->sf_idx[w*16+g] = SCALE_ONE_POS + FFMIN(log2f(uplims[w*16+g]/minthr)*4,59);

  562.         }

  563.     }

  564. 

  565.     if (!allz)

  566.         return;

  567.     abs_pow34_v(s->scoefs, sce->coeffs, 1024);

  568. 

  569.     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {

  570.         start = w*128;

  571.         for (g = 0;  g < sce->ics.num_swb; g++) {

  572.             const float *scaled = s->scoefs + start;

  573.             maxvals[w*16+g] = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], scaled);

  574.             start += sce->ics.swb_sizes[g];

  575.         }

  576.     }

  577. 

  578.     //perform two-loop search

  579.     //outer loop - improve quality

  580.     do {

  581.         int tbits, qstep;

  582.         minscaler = sce->sf_idx[0];

  583.         //inner loop - quantize spectrum to fit into given number of bits

  584.         qstep = its ? 1 : 32;

  585.         do {

  586.             int prev = -1;

  587.             tbits = 0;

  588.             for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {

  589.                 start = w*128;

  590.                 for (g = 0;  g < sce->ics.num_swb; g++) {

  591.                     const float *coefs = &sce->coeffs[start];

  592.                     const float *scaled = &s->scoefs[start];

  593.                     int bits = 0;

  594.                     int cb;

  595.                     float dist = 0.0f;

  596. 

  597.                     if (sce->zeroes[w*16+g] || sce->sf_idx[w*16+g] >= 218) {

  598.                         start += sce->ics.swb_sizes[g];

  599.                         continue;

  600.                     }

  601.                     minscaler = FFMIN(minscaler, sce->sf_idx[w*16+g]);

  602.                     cb = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]);

  603.                     for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {

  604.                         int b;

  605.                         dist += quantize_band_cost(s, coefs + w2*128,

  606.                                                    scaled + w2*128,

  607.                                                    sce->ics.swb_sizes[g],

  608.                                                    sce->sf_idx[w*16+g],

  609.                                                    cb,

  610.                                                    1.0f,

  611.                                                    INFINITY,

  612.                                                    &b,

  613.                                                    0);

  614.                         bits += b;

  615.                     }

  616.                     dists[w*16+g] = dist - bits;

  617.                     if (prev != -1) {

  618.                         bits += ff_aac_scalefactor_bits[sce->sf_idx[w*16+g] - prev + SCALE_DIFF_ZERO];

  619.                     }

  620.                     tbits += bits;

  621.                     start += sce->ics.swb_sizes[g];

  622.                     prev = sce->sf_idx[w*16+g];

  623.                 }

  624.             }

  625.             if (tbits > destbits) {

  626.                 for (i = 0; i < 128; i++)

  627.                     if (sce->sf_idx[i] < 218 - qstep)

  628.                         sce->sf_idx[i] += qstep;

  629.             } else {

  630.                 for (i = 0; i < 128; i++)

  631.                     if (sce->sf_idx[i] > 60 - qstep)

  632.                         sce->sf_idx[i] -= qstep;

  633.             }

  634.             qstep >>= 1;

  635.             if (!qstep && tbits > destbits*1.02 && sce->sf_idx[0] < 217)

  636.                 qstep = 1;

  637.         } while (qstep);

  638. 

  639.         fflag = 0;

  640.         minscaler = av_clip(minscaler, 60, 255 - SCALE_MAX_DIFF);

  641. 

  642.         for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {

  643.             for (g = 0; g < sce->ics.num_swb; g++) {

  644.                 int prevsc = sce->sf_idx[w*16+g];

  645.                 if (dists[w*16+g] > uplims[w*16+g] && sce->sf_idx[w*16+g] > 60) {

  646.                     if (find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]-1))

  647.                         sce->sf_idx[w*16+g]--;

  648.                     else //Try to make sure there is some energy in every band

  649.                         sce->sf_idx[w*16+g]-=2;

  650.                 }

  651.                 sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], minscaler, minscaler + SCALE_MAX_DIFF);

  652.                 sce->sf_idx[w*16+g] = FFMIN(sce->sf_idx[w*16+g], 219);

  653.                 if (sce->sf_idx[w*16+g] != prevsc)

  654.                     fflag = 1;

  655.                 sce->band_type[w*16+g] = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]);

  656.             }

  657.         }

  658.         its++;

  659.     } while (fflag && its < 10);

  660. }

  661. 

  662. static void search_for_quantizers_faac(AVCodecContext *avctx, AACEncContext *s,

  663.                                        SingleChannelElement *sce,

  664.                                        const float lambda)

  665. {

  666.     int start = 0, i, w, w2, g;

  667.     float uplim[128], maxq[128];

  668.     int minq, maxsf;

  669.     float distfact = ((sce->ics.num_windows > 1) ? 85.80 : 147.84) / lambda;

  670.     int last = 0, lastband = 0, curband = 0;

  671.     float avg_energy = 0.0;

  672.     if (sce->ics.num_windows == 1) {

  673.         start = 0;

  674.         for (i = 0; i < 1024; i++) {

  675.             if (i - start >= sce->ics.swb_sizes[curband]) {

  676.                 start += sce->ics.swb_sizes[curband];

  677.                 curband++;

  678.             }

  679.             if (sce->coeffs[i]) {

  680.                 avg_energy += sce->coeffs[i] * sce->coeffs[i];

  681.                 last = i;

  682.                 lastband = curband;

  683.             }

  684.         }

  685.     } else {

  686.         for (w = 0; w < 8; w++) {

  687.             const float *coeffs = &sce->coeffs[w*128];

  688.             curband = start = 0;

  689.             for (i = 0; i < 128; i++) {

  690.                 if (i - start >= sce->ics.swb_sizes[curband]) {

  691.                     start += sce->ics.swb_sizes[curband];

  692.                     curband++;

  693.                 }

  694.                 if (coeffs[i]) {

  695.                     avg_energy += coeffs[i] * coeffs[i];

  696.                     last = FFMAX(last, i);

  697.                     lastband = FFMAX(lastband, curband);

  698.                 }

  699.             }

  700.         }

  701.     }

  702.     last++;

  703.     avg_energy /= last;

  704.     if (avg_energy == 0.0f) {

  705.         for (i = 0; i < FF_ARRAY_ELEMS(sce->sf_idx); i++)

  706.             sce->sf_idx[i] = SCALE_ONE_POS;

  707.         return;

  708.     }

  709.     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {

  710.         start = w*128;

  711.         for (g = 0; g < sce->ics.num_swb; g++) {

  712.             float *coefs   = &sce->coeffs[start];

  713.             const int size = sce->ics.swb_sizes[g];

  714.             int start2 = start, end2 = start + size, peakpos = start;

  715.             float maxval = -1, thr = 0.0f, t;

  716.             maxq[w*16+g] = 0.0f;

  717.             if (g > lastband) {

  718.                 maxq[w*16+g] = 0.0f;

  719.                 start += size;

  720.                 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++)

  721.                     memset(coefs + w2*128, 0, sizeof(coefs[0])*size);

  722.                 continue;

  723.             }

  724.             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {

  725.                 for (i = 0; i < size; i++) {

  726.                     float t = coefs[w2*128+i]*coefs[w2*128+i];

  727.                     maxq[w*16+g] = FFMAX(maxq[w*16+g], fabsf(coefs[w2*128 + i]));

  728.                     thr += t;

  729.                     if (sce->ics.num_windows == 1 && maxval < t) {

  730.                         maxval  = t;

  731.                         peakpos = start+i;

  732.                     }

  733.                 }

  734.             }

  735.             if (sce->ics.num_windows == 1) {

  736.                 start2 = FFMAX(peakpos - 2, start2);

  737.                 end2   = FFMIN(peakpos + 3, end2);

  738.             } else {

  739.                 start2 -= start;

  740.                 end2   -= start;

  741.             }

  742.             start += size;

  743.             thr = pow(thr / (avg_energy * (end2 - start2)), 0.3 + 0.1*(lastband - g) / lastband);

  744.             t   = 1.0 - (1.0 * start2 / last);

  745.             uplim[w*16+g] = distfact / (1.4 * thr + t*t*t + 0.075);

  746.         }

  747.     }

  748.     memset(sce->sf_idx, 0, sizeof(sce->sf_idx));

  749.     abs_pow34_v(s->scoefs, sce->coeffs, 1024);

  750.     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {

  751.         start = w*128;

  752.         for (g = 0;  g < sce->ics.num_swb; g++) {

  753.             const float *coefs  = &sce->coeffs[start];

  754.             const float *scaled = &s->scoefs[start];

  755.             const int size      = sce->ics.swb_sizes[g];

  756.             int scf, prev_scf, step;

  757.             int min_scf = -1, max_scf = 256;

  758.             float curdiff;

  759.             if (maxq[w*16+g] < 21.544) {

  760.                 sce->zeroes[w*16+g] = 1;

  761.                 start += size;

  762.                 continue;

  763.             }

  764.             sce->zeroes[w*16+g] = 0;

  765.             scf  = prev_scf = av_clip(SCALE_ONE_POS - SCALE_DIV_512 - log2f(1/maxq[w*16+g])*16/3, 60, 218);

  766.             for (;;) {

  767.                 float dist = 0.0f;

  768.                 int quant_max;

  769. 

  770.                 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {

  771.                     int b;

  772.                     dist += quantize_band_cost(s, coefs + w2*128,

  773.                                                scaled + w2*128,

  774.                                                sce->ics.swb_sizes[g],

  775.                                                scf,

  776.                                                ESC_BT,

  777.                                                lambda,

  778.                                                INFINITY,

  779.                                                &b,

  780.                                                0);

  781.                     dist -= b;

  782.                 }

  783.                 dist *= 1.0f / 512.0f / lambda;

  784.                 quant_max = quant(maxq[w*16+g], ff_aac_pow2sf_tab[POW_SF2_ZERO - scf + SCALE_ONE_POS - SCALE_DIV_512], ROUND_STANDARD);

  785.                 if (quant_max >= 8191) { // too much, return to the previous quantizer

  786.                     sce->sf_idx[w*16+g] = prev_scf;

  787.                     break;

  788.                 }

  789.                 prev_scf = scf;

  790.                 curdiff = fabsf(dist - uplim[w*16+g]);

  791.                 if (curdiff <= 1.0f)

  792.                     step = 0;

  793.                 else

  794.                     step = log2f(curdiff);

  795.                 if (dist > uplim[w*16+g])

  796.                     step = -step;

  797.                 scf += step;

  798.                 scf = av_clip_uint8(scf);

  799.                 step = scf - prev_scf;

  800.                 if (FFABS(step) <= 1 || (step > 0 && scf >= max_scf) || (step < 0 && scf <= min_scf)) {

  801.                     sce->sf_idx[w*16+g] = av_clip(scf, min_scf, max_scf);

  802.                     break;

  803.                 }

  804.                 if (step > 0)

  805.                     min_scf = prev_scf;

  806.                 else

  807.                     max_scf = prev_scf;

  808.             }

  809.             start += size;

  810.         }

  811.     }

  812.     minq = sce->sf_idx[0] ? sce->sf_idx[0] : INT_MAX;

  813.     for (i = 1; i < 128; i++) {

  814.         if (!sce->sf_idx[i])

  815.             sce->sf_idx[i] = sce->sf_idx[i-1];

  816.         else

  817.             minq = FFMIN(minq, sce->sf_idx[i]);

  818.     }

  819.     if (minq == INT_MAX)

  820.         minq = 0;

  821.     minq = FFMIN(minq, SCALE_MAX_POS);

  822.     maxsf = FFMIN(minq + SCALE_MAX_DIFF, SCALE_MAX_POS);

  823.     for (i = 126; i >= 0; i--) {

  824.         if (!sce->sf_idx[i])

  825.             sce->sf_idx[i] = sce->sf_idx[i+1];

  826.         sce->sf_idx[i] = av_clip(sce->sf_idx[i], minq, maxsf);

  827.     }

  828. }

  829. 

  830. static void search_for_quantizers_fast(AVCodecContext *avctx, AACEncContext *s,

  831.                                        SingleChannelElement *sce,

  832.                                        const float lambda)

  833. {

  834.     int i, w, w2, g;

  835.     int minq = 255;

  836. 

  837.     memset(sce->sf_idx, 0, sizeof(sce->sf_idx));

  838.     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {

  839.         for (g = 0; g < sce->ics.num_swb; g++) {

  840.             for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {

  841.                 FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];

  842.                 if (band->energy <= band->threshold) {

  843.                     sce->sf_idx[(w+w2)*16+g] = 218;

  844.                     sce->zeroes[(w+w2)*16+g] = 1;

  845.                 } else {

  846.                     sce->sf_idx[(w+w2)*16+g] = av_clip(SCALE_ONE_POS - SCALE_DIV_512 + log2f(band->threshold), 80, 218);

  847.                     sce->zeroes[(w+w2)*16+g] = 0;

  848.                 }

  849.                 minq = FFMIN(minq, sce->sf_idx[(w+w2)*16+g]);

  850.             }

  851.         }

  852.     }

  853.     for (i = 0; i < 128; i++) {

  854.         sce->sf_idx[i] = 140;

  855.         //av_clip(sce->sf_idx[i], minq, minq + SCALE_MAX_DIFF - 1);

  856.     }

  857.     //set the same quantizers inside window groups

  858.     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])

  859.         for (g = 0;  g < sce->ics.num_swb; g++)

  860.             for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)

  861.                 sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];

  862. }

  863. 

  864. static void search_for_pns(AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce)

  865. {

  866.     int start = 0, w, w2, g;

  867.     const float lambda = s->lambda;

  868.     const float freq_mult = avctx->sample_rate/(1024.0f/sce->ics.num_windows)/2.0f;

  869.     const float spread_threshold = NOISE_SPREAD_THRESHOLD*(lambda/120.f);

  870.     const float thr_mult = NOISE_LAMBDA_NUMERATOR/lambda;

  871. 

  872.     for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {

  873.         start = 0;

  874.         for (g = 0;  g < sce->ics.num_swb; g++) {

  875.             if (start*freq_mult > NOISE_LOW_LIMIT*(lambda/170.0f)) {

  876.                 float energy = 0.0f, threshold = 0.0f, spread = 0.0f;

  877.                 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {

  878.                     FFPsyBand *band = &s->psy.ch[s->cur_channel+0].psy_bands[(w+w2)*16+g];

  879.                     energy += band->energy;

  880.                     threshold += band->threshold;

  881.                     spread += band->spread;

  882.                 }

  883.                 if (spread > spread_threshold*sce->ics.group_len[w] &&

  884.                     ((sce->zeroes[w*16+g] && energy >= threshold) ||

  885.                     energy < threshold*thr_mult*sce->ics.group_len[w])) {

  886.                     sce->band_type[w*16+g] = NOISE_BT;

  887.                     sce->pns_ener[w*16+g] = energy / sce->ics.group_len[w];

  888.                     sce->zeroes[w*16+g] = 0;

  889.                 }

  890.             }

  891.             start += sce->ics.swb_sizes[g];

  892.         }

  893.     }

  894. }

  895. 

  896. static void search_for_ms(AACEncContext *s, ChannelElement *cpe)

  897. {

  898.     int start = 0, i, w, w2, g;

  899.     float M[128], S[128];

  900.     float *L34 = s->scoefs, *R34 = s->scoefs + 128, *M34 = s->scoefs + 128*2, *S34 = s->scoefs + 128*3;

  901.     const float lambda = s->lambda;

  902.     SingleChannelElement *sce0 = &cpe->ch[0];

  903.     SingleChannelElement *sce1 = &cpe->ch[1];

  904.     if (!cpe->common_window)

  905.         return;

  906.     for (w = 0; w < sce0->ics.num_windows; w += sce0->ics.group_len[w]) {

  907.         start = 0;

  908.         for (g = 0;  g < sce0->ics.num_swb; g++) {

  909.             if (!cpe->ch[0].zeroes[w*16+g] && !cpe->ch[1].zeroes[w*16+g]) {

  910.                 float dist1 = 0.0f, dist2 = 0.0f;

  911.                 for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {

  912.                     FFPsyBand *band0 = &s->psy.ch[s->cur_channel+0].psy_bands[(w+w2)*16+g];

  913.                     FFPsyBand *band1 = &s->psy.ch[s->cur_channel+1].psy_bands[(w+w2)*16+g];

  914.                     float minthr = FFMIN(band0->threshold, band1->threshold);

  915.                     float maxthr = FFMAX(band0->threshold, band1->threshold);

  916.                     for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {

  917.                         M[i] = (sce0->coeffs[start+(w+w2)*128+i]

  918.                               + sce1->coeffs[start+(w+w2)*128+i]) * 0.5;

  919.                         S[i] =  M[i]

  920.                               - sce1->coeffs[start+(w+w2)*128+i];

  921.                     }

  922.                     abs_pow34_v(L34, sce0->coeffs+start+(w+w2)*128, sce0->ics.swb_sizes[g]);

  923.                     abs_pow34_v(R34, sce1->coeffs+start+(w+w2)*128, sce0->ics.swb_sizes[g]);

  924.                     abs_pow34_v(M34, M,                         sce0->ics.swb_sizes[g]);

  925.                     abs_pow34_v(S34, S,                         sce0->ics.swb_sizes[g]);

  926.                     dist1 += quantize_band_cost(s, &sce0->coeffs[start + (w+w2)*128],

  927.                                                 L34,

  928.                                                 sce0->ics.swb_sizes[g],

  929.                                                 sce0->sf_idx[(w+w2)*16+g],

  930.                                                 sce0->band_type[(w+w2)*16+g],

  931.                                                 lambda / band0->threshold, INFINITY, NULL, 0);

  932.                     dist1 += quantize_band_cost(s, &sce1->coeffs[start + (w+w2)*128],

  933.                                                 R34,

  934.                                                 sce1->ics.swb_sizes[g],

  935.                                                 sce1->sf_idx[(w+w2)*16+g],

  936.                                                 sce1->band_type[(w+w2)*16+g],

  937.                                                 lambda / band1->threshold, INFINITY, NULL, 0);

  938.                     dist2 += quantize_band_cost(s, M,

  939.                                                 M34,

  940.                                                 sce0->ics.swb_sizes[g],

  941.                                                 sce0->sf_idx[(w+w2)*16+g],

  942.                                                 sce0->band_type[(w+w2)*16+g],

  943.                                                 lambda / maxthr, INFINITY, NULL, 0);

  944.                     dist2 += quantize_band_cost(s, S,

  945.                                                 S34,

  946.                                                 sce1->ics.swb_sizes[g],

  947.                                                 sce1->sf_idx[(w+w2)*16+g],

  948.                                                 sce1->band_type[(w+w2)*16+g],

  949.                                                 lambda / minthr, INFINITY, NULL, 0);

  950.                 }

  951.                 cpe->ms_mask[w*16+g] = dist2 < dist1;

  952.             }

  953.             start += sce0->ics.swb_sizes[g];

  954.         }

  955.     }

  956. }

  957. 

  958. AACCoefficientsEncoder ff_aac_coders[AAC_CODER_NB] = {

  959.     [AAC_CODER_FAAC] = {

  960.         search_for_quantizers_faac,

  961.         encode_window_bands_info,

  962.         quantize_and_encode_band,

  963.         ff_aac_encode_tns_info,

  964.         ff_aac_encode_main_pred,

  965.         ff_aac_adjust_common_prediction,

  966.         ff_aac_apply_main_pred,

  967.         set_special_band_scalefactors,

  968.         search_for_pns,

  969.         ff_aac_search_for_tns,

  970.         search_for_ms,

  971.         ff_aac_search_for_is,

  972.         ff_aac_search_for_pred,

  973.     },

  974.     [AAC_CODER_ANMR] = {

  975.         search_for_quantizers_anmr,

  976.         encode_window_bands_info,

  977.         quantize_and_encode_band,

  978.         ff_aac_encode_tns_info,

  979.         ff_aac_encode_main_pred,

  980.         ff_aac_adjust_common_prediction,

  981.         ff_aac_apply_main_pred,

  982.         set_special_band_scalefactors,

  983.         search_for_pns,

  984.         ff_aac_search_for_tns,

  985.         search_for_ms,

  986.         ff_aac_search_for_is,

  987.         ff_aac_search_for_pred,

  988.     },

  989.     [AAC_CODER_TWOLOOP] = {

  990.         search_for_quantizers_twoloop,

  991.         codebook_trellis_rate,

  992.         quantize_and_encode_band,

  993.         ff_aac_encode_tns_info,

  994.         ff_aac_encode_main_pred,

  995.         ff_aac_adjust_common_prediction,

  996.         ff_aac_apply_main_pred,

  997.         set_special_band_scalefactors,

  998.         search_for_pns,

  999.         ff_aac_search_for_tns,

  1000.         search_for_ms,

  1001.         ff_aac_search_for_is,

  1002.         ff_aac_search_for_pred,

  1003.     },

  1004.     [AAC_CODER_FAST] = {

  1005.         search_for_quantizers_fast,

  1006.         encode_window_bands_info,

  1007.         quantize_and_encode_band,

  1008.         ff_aac_encode_tns_info,

  1009.         ff_aac_encode_main_pred,

  1010.         ff_aac_adjust_common_prediction,

  1011.         ff_aac_apply_main_pred,

  1012.         set_special_band_scalefactors,

  1013.         search_for_pns,

  1014.         ff_aac_search_for_tns,

  1015.         search_for_ms,

  1016.         ff_aac_search_for_is,

  1017.         ff_aac_search_for_pred,

  1018.     },

  1019. };