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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. 

  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 = coef2minsf(q0f);

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

  266.     q1 = coef2maxsf(q1f);

  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. 

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

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

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

  286.     }

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

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

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

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

  291.         }

  292.     }

  293.     idx = 1;

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

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

  296.         start = w*128;

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

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

  299.             float qmin, qmax;

  300.             int nz = 0;

  301. 

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

  303.             qmin = INT_MAX;

  304.             qmax = 0.0f;

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

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

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

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

  309.                     continue;

  310.                 }

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

  312.                 nz = 1;

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

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

  315.                     if (t > 0.0f)

  316.                         qmin = FFMIN(qmin, t);

  317.                     qmax = FFMAX(qmax, t);

  318.                 }

  319.             }

  320.             if (nz) {

  321.                 int minscale, maxscale;

  322.                 float minrd = INFINITY;

  323.                 float maxval;

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

  325.                 minscale = coef2minsf(qmin);

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

  327.                 maxscale = coef2maxsf(qmax);

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

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

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

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

  332.                     float dist = 0;

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

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

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

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

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

  338.                     }

  339.                     minrd = FFMIN(minrd, dist);

  340. 

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

  342.                         float cost;

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

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

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

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

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

  348.                         }

  349.                     }

  350.                 }

  351.             } else {

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

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

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

  355.                 }

  356.             }

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

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

  359.             idx++;

  360.         }

  361.     }

  362.     idx--;

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

  364.     minq    = 0;

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

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

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

  368.             minq = i;

  369.         }

  370.     }

  371.     while (idx) {

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

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

  374.         idx--;

  375.     }

  376.     //set the same quantizers inside window groups

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

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

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

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

  381. }

  382. 

  383. 

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

  385.                                        SingleChannelElement *sce,

  386.                                        const float lambda)

  387. {

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

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

  390.     int minq, maxsf;

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

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

  393.     float avg_energy = 0.0;

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

  395.         start = 0;

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

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

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

  399.                 curband++;

  400.             }

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

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

  403.                 last = i;

  404.                 lastband = curband;

  405.             }

  406.         }

  407.     } else {

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

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

  410.             curband = start = 0;

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

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

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

  414.                     curband++;

  415.                 }

  416.                 if (coeffs[i]) {

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

  418.                     last = FFMAX(last, i);

  419.                     lastband = FFMAX(lastband, curband);

  420.                 }

  421.             }

  422.         }

  423.     }

  424.     last++;

  425.     avg_energy /= last;

  426.     if (avg_energy == 0.0f) {

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

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

  429.         return;

  430.     }

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

  432.         start = w*128;

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

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

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

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

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

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

  439.             if (g > lastband) {

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

  441.                 start += size;

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

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

  444.                 continue;

  445.             }

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

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

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

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

  450.                     thr += t;

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

  452.                         maxval  = t;

  453.                         peakpos = start+i;

  454.                     }

  455.                 }

  456.             }

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

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

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

  460.             } else {

  461.                 start2 -= start;

  462.                 end2   -= start;

  463.             }

  464.             start += size;

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

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

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

  468.         }

  469.     }

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

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

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

  473.         start = w*128;

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

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

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

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

  478.             int scf, prev_scf, step;

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

  480.             float curdiff;

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

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

  483.                 start += size;

  484.                 continue;

  485.             }

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

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

  488.             for (;;) {

  489.                 float dist = 0.0f;

  490.                 int quant_max;

  491. 

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

  493.                     int b;

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

  495.                                                scaled + w2*128,

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

  497.                                                scf,

  498.                                                ESC_BT,

  499.                                                lambda,

  500.                                                INFINITY,

  501.                                                &b, NULL,

  502.                                                0);

  503.                     dist -= b;

  504.                 }

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

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

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

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

  509.                     break;

  510.                 }

  511.                 prev_scf = scf;

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

  513.                 if (curdiff <= 1.0f)

  514.                     step = 0;

  515.                 else

  516.                     step = log2f(curdiff);

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

  518.                     step = -step;

  519.                 scf += step;

  520.                 scf = av_clip_uint8(scf);

  521.                 step = scf - prev_scf;

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

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

  524.                     break;

  525.                 }

  526.                 if (step > 0)

  527.                     min_scf = prev_scf;

  528.                 else

  529.                     max_scf = prev_scf;

  530.             }

  531.             start += size;

  532.         }

  533.     }

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

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

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

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

  538.         else

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

  540.     }

  541.     if (minq == INT_MAX)

  542.         minq = 0;

  543.     minq = FFMIN(minq, SCALE_MAX_POS);

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

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

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

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

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

  549.     }

  550. }

  551. 

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

  553.                                        SingleChannelElement *sce,

  554.                                        const float lambda)

  555. {

  556.     int i, w, w2, g;

  557.     int minq = 255;

  558. 

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

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

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

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

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

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

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

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

  567.                 } else {

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

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

  570.                 }

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

  572.             }

  573.         }

  574.     }

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

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

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

  578.     }

  579.     //set the same quantizers inside window groups

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

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

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

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

  584. }

  585. 

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

  587. {

  588.     FFPsyBand *band;

  589.     int w, g, w2, i;

  590.     int wlen = 1024 / sce->ics.num_windows;

  591.     int bandwidth, cutoff;

  592.     float *PNS = &s->scoefs[0*128], *PNS34 = &s->scoefs[1*128];

  593.     float *NOR34 = &s->scoefs[3*128];

  594.     uint8_t nextband[128];

  595.     const float lambda = s->lambda;

  596.     const float freq_mult = avctx->sample_rate*0.5f/wlen;

  597.     const float thr_mult = NOISE_LAMBDA_REPLACE*(100.0f/lambda);

  598.     const float spread_threshold = FFMIN(0.75f, NOISE_SPREAD_THRESHOLD*FFMAX(0.5f, lambda/100.f));

  599.     const float dist_bias = av_clipf(4.f * 120 / lambda, 0.25f, 4.0f);

  600.     const float pns_transient_energy_r = FFMIN(0.7f, lambda / 140.f);

  601. 

  602.     int refbits = avctx->bit_rate * 1024.0 / avctx->sample_rate

  603.         / ((avctx->flags & CODEC_FLAG_QSCALE) ? 2.0f : avctx->channels)

  604.         * (lambda / 120.f);

  605. 

  606.     /** Keep this in sync with twoloop's cutoff selection */

  607.     float rate_bandwidth_multiplier = 1.5f;

  608.     int prev = -1000, prev_sf = -1;

  609.     int frame_bit_rate = (avctx->flags & CODEC_FLAG_QSCALE)

  610.         ? (refbits * rate_bandwidth_multiplier * avctx->sample_rate / 1024)

  611.         : (avctx->bit_rate / avctx->channels);

  612. 

  613.     frame_bit_rate *= 1.15f;

  614. 

  615.     if (avctx->cutoff > 0) {

  616.         bandwidth = avctx->cutoff;

  617.     } else {

  618.         bandwidth = FFMAX(3000, AAC_CUTOFF_FROM_BITRATE(frame_bit_rate, 1, avctx->sample_rate));

  619.     }

  620. 

  621.     cutoff = bandwidth * 2 * wlen / avctx->sample_rate;

  622. 

  623.     memcpy(sce->band_alt, sce->band_type, sizeof(sce->band_type));

  624.     ff_init_nextband_map(sce, nextband);

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

  626.         int wstart = w*128;

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

  628.             int noise_sfi;

  629.             float dist1 = 0.0f, dist2 = 0.0f, noise_amp;

  630.             float pns_energy = 0.0f, pns_tgt_energy, energy_ratio, dist_thresh;

  631.             float sfb_energy = 0.0f, threshold = 0.0f, spread = 2.0f;

  632.             float min_energy = -1.0f, max_energy = 0.0f;

  633.             const int start = wstart+sce->ics.swb_offset[g];

  634.             const float freq = (start-wstart)*freq_mult;

  635.             const float freq_boost = FFMAX(0.88f*freq/NOISE_LOW_LIMIT, 1.0f);

  636.             if (freq < NOISE_LOW_LIMIT || (start-wstart) >= cutoff)

  637.                 continue;

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

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

  640.                 sfb_energy += band->energy;

  641.                 spread     = FFMIN(spread, band->spread);

  642.                 threshold  += band->threshold;

  643.                 if (!w2) {

  644.                     min_energy = max_energy = band->energy;

  645.                 } else {

  646.                     min_energy = FFMIN(min_energy, band->energy);

  647.                     max_energy = FFMAX(max_energy, band->energy);

  648.                 }

  649.             }

  650. 

  651.             /* Ramps down at ~8000Hz and loosens the dist threshold */

  652.             dist_thresh = av_clipf(2.5f*NOISE_LOW_LIMIT/freq, 0.5f, 2.5f) * dist_bias;

  653. 

  654.             /* PNS is acceptable when all of these are true:

  655.              * 1. high spread energy (noise-like band)

  656.              * 2. near-threshold energy (high PE means the random nature of PNS content will be noticed)

  657.              * 3. on short window groups, all windows have similar energy (variations in energy would be destroyed by PNS)

  658.              *

  659.              * At this stage, point 2 is relaxed for zeroed bands near the noise threshold (hole avoidance is more important)

  660.              */

  661.             if ((!sce->zeroes[w*16+g] && !ff_sfdelta_can_remove_band(sce, nextband, prev_sf, w*16+g)) ||

  662.                 ((sce->zeroes[w*16+g] || !sce->band_alt[w*16+g]) && sfb_energy < threshold*sqrtf(1.0f/freq_boost)) || spread < spread_threshold ||

  663.                 (!sce->zeroes[w*16+g] && sce->band_alt[w*16+g] && sfb_energy > threshold*thr_mult*freq_boost) ||

  664.                 min_energy < pns_transient_energy_r * max_energy ) {

  665.                 sce->pns_ener[w*16+g] = sfb_energy;

  666.                 if (!sce->zeroes[w*16+g])

  667.                     prev_sf = sce->sf_idx[w*16+g];

  668.                 continue;

  669.             }

  670. 

  671.             pns_tgt_energy = sfb_energy*FFMIN(1.0f, spread*spread);

  672.             noise_sfi = av_clip(roundf(log2f(pns_tgt_energy)*2), -100, 155); /* Quantize */

  673.             noise_amp = -ff_aac_pow2sf_tab[noise_sfi + POW_SF2_ZERO];    /* Dequantize */

  674.             if (prev != -1000) {

  675.                 int noise_sfdiff = noise_sfi - prev + SCALE_DIFF_ZERO;

  676.                 if (noise_sfdiff < 0 || noise_sfdiff > 2*SCALE_MAX_DIFF) {

  677.                     if (!sce->zeroes[w*16+g])

  678.                         prev_sf = sce->sf_idx[w*16+g];

  679.                     continue;

  680.                 }

  681.             }

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

  683.                 float band_energy, scale, pns_senergy;

  684.                 const int start_c = (w+w2)*128+sce->ics.swb_offset[g];

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

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

  687.                     PNS[i] = s->random_state = lcg_random(s->random_state);

  688.                 band_energy = s->fdsp->scalarproduct_float(PNS, PNS, sce->ics.swb_sizes[g]);

  689.                 scale = noise_amp/sqrtf(band_energy);

  690.                 s->fdsp->vector_fmul_scalar(PNS, PNS, scale, sce->ics.swb_sizes[g]);

  691.                 pns_senergy = s->fdsp->scalarproduct_float(PNS, PNS, sce->ics.swb_sizes[g]);

  692.                 pns_energy += pns_senergy;

  693.                 abs_pow34_v(NOR34, &sce->coeffs[start_c], sce->ics.swb_sizes[g]);

  694.                 abs_pow34_v(PNS34, PNS, sce->ics.swb_sizes[g]);

  695.                 dist1 += quantize_band_cost(s, &sce->coeffs[start_c],

  696.                                             NOR34,

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

  698.                                             sce->sf_idx[(w+w2)*16+g],

  699.                                             sce->band_alt[(w+w2)*16+g],

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

  701.                 /* Estimate rd on average as 5 bits for SF, 4 for the CB, plus spread energy * lambda/thr */

  702.                 dist2 += band->energy/(band->spread*band->spread)*lambda*dist_thresh/band->threshold;

  703.             }

  704.             if (g && sce->sf_idx[(w+w2)*16+g-1] == NOISE_BT) {

  705.                 dist2 += 5;

  706.             } else {

  707.                 dist2 += 9;

  708.             }

  709.             energy_ratio = pns_tgt_energy/pns_energy; /* Compensates for quantization error */

  710.             sce->pns_ener[w*16+g] = energy_ratio*pns_tgt_energy;

  711.             if (sce->zeroes[w*16+g] || !sce->band_alt[w*16+g] || (energy_ratio > 0.85f && energy_ratio < 1.25f && dist2 < dist1)) {

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

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

  714.                 prev = noise_sfi;

  715.             }

  716.             if (!sce->zeroes[w*16+g])

  717.                 prev_sf = sce->sf_idx[w*16+g];

  718.         }

  719.     }

  720. }

  721. 

  722. static void mark_pns(AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce)

  723. {

  724.     FFPsyBand *band;

  725.     int w, g, w2;

  726.     int wlen = 1024 / sce->ics.num_windows;

  727.     int bandwidth, cutoff;

  728.     const float lambda = s->lambda;

  729.     const float freq_mult = avctx->sample_rate*0.5f/wlen;

  730.     const float spread_threshold = FFMIN(0.75f, NOISE_SPREAD_THRESHOLD*FFMAX(0.5f, lambda/100.f));

  731.     const float pns_transient_energy_r = FFMIN(0.7f, lambda / 140.f);

  732. 

  733.     int refbits = avctx->bit_rate * 1024.0 / avctx->sample_rate

  734.         / ((avctx->flags & CODEC_FLAG_QSCALE) ? 2.0f : avctx->channels)

  735.         * (lambda / 120.f);

  736. 

  737.     /** Keep this in sync with twoloop's cutoff selection */

  738.     float rate_bandwidth_multiplier = 1.5f;

  739.     int frame_bit_rate = (avctx->flags & CODEC_FLAG_QSCALE)

  740.         ? (refbits * rate_bandwidth_multiplier * avctx->sample_rate / 1024)

  741.         : (avctx->bit_rate / avctx->channels);

  742. 

  743.     frame_bit_rate *= 1.15f;

  744. 

  745.     if (avctx->cutoff > 0) {

  746.         bandwidth = avctx->cutoff;

  747.     } else {

  748.         bandwidth = FFMAX(3000, AAC_CUTOFF_FROM_BITRATE(frame_bit_rate, 1, avctx->sample_rate));

  749.     }

  750. 

  751.     cutoff = bandwidth * 2 * wlen / avctx->sample_rate;

  752. 

  753.     memcpy(sce->band_alt, sce->band_type, sizeof(sce->band_type));

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

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

  756.             float sfb_energy = 0.0f, threshold = 0.0f, spread = 2.0f;

  757.             float min_energy = -1.0f, max_energy = 0.0f;

  758.             const int start = sce->ics.swb_offset[g];

  759.             const float freq = start*freq_mult;

  760.             const float freq_boost = FFMAX(0.88f*freq/NOISE_LOW_LIMIT, 1.0f);

  761.             if (freq < NOISE_LOW_LIMIT || start >= cutoff) {

  762.                 sce->can_pns[w*16+g] = 0;

  763.                 continue;

  764.             }

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

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

  767.                 sfb_energy += band->energy;

  768.                 spread     = FFMIN(spread, band->spread);

  769.                 threshold  += band->threshold;

  770.                 if (!w2) {

  771.                     min_energy = max_energy = band->energy;

  772.                 } else {

  773.                     min_energy = FFMIN(min_energy, band->energy);

  774.                     max_energy = FFMAX(max_energy, band->energy);

  775.                 }

  776.             }

  777. 

  778.             /* PNS is acceptable when all of these are true:

  779.              * 1. high spread energy (noise-like band)

  780.              * 2. near-threshold energy (high PE means the random nature of PNS content will be noticed)

  781.              * 3. on short window groups, all windows have similar energy (variations in energy would be destroyed by PNS)

  782.              */

  783.             sce->pns_ener[w*16+g] = sfb_energy;

  784.             if (sfb_energy < threshold*sqrtf(1.5f/freq_boost) || spread < spread_threshold || min_energy < pns_transient_energy_r * max_energy) {

  785.                 sce->can_pns[w*16+g] = 0;

  786.             } else {

  787.                 sce->can_pns[w*16+g] = 1;

  788.             }

  789.         }

  790.     }

  791. }

  792. 

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

  794. {

  795.     int start = 0, i, w, w2, g, sid_sf_boost, prev_mid, prev_side;

  796.     uint8_t nextband0[128], nextband1[128];

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

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

  799.     const float lambda = s->lambda;

  800.     const float mslambda = FFMIN(1.0f, lambda / 120.f);

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

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

  803.     if (!cpe->common_window)

  804.         return;

  805. 

  806.     /** Scout out next nonzero bands */

  807.     ff_init_nextband_map(sce0, nextband0);

  808.     ff_init_nextband_map(sce1, nextband1);

  809. 

  810.     prev_mid = sce0->sf_idx[0];

  811.     prev_side = sce1->sf_idx[0];

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

  813.         start = 0;

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

  815.             float bmax = bval2bmax(g * 17.0f / sce0->ics.num_swb) / 0.0045f;

  816.             cpe->ms_mask[w*16+g] = 0;

  817.             if (!sce0->zeroes[w*16+g] && !sce1->zeroes[w*16+g]) {

  818.                 float Mmax = 0.0f, Smax = 0.0f;

  819. 

  820.                 /* Must compute mid/side SF and book for the whole window group */

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

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

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

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

  825.                         S[i] =  M[i]

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

  827.                     }

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

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

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

  831.                         Mmax = FFMAX(Mmax, M34[i]);

  832.                         Smax = FFMAX(Smax, S34[i]);

  833.                     }

  834.                 }

  835. 

  836.                 for (sid_sf_boost = 0; sid_sf_boost < 4; sid_sf_boost++) {

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

  838.                     int B0 = 0, B1 = 0;

  839.                     int minidx;

  840.                     int mididx, sididx;

  841.                     int midcb, sidcb;

  842. 

  843.                     minidx = FFMIN(sce0->sf_idx[w*16+g], sce1->sf_idx[w*16+g]);

  844.                     mididx = av_clip(minidx, 0, SCALE_MAX_POS - SCALE_DIV_512);

  845.                     sididx = av_clip(minidx - sid_sf_boost * 3, 0, SCALE_MAX_POS - SCALE_DIV_512);

  846.                     if (!cpe->is_mask[w*16+g] && sce0->band_type[w*16+g] != NOISE_BT && sce1->band_type[w*16+g] != NOISE_BT

  847.                         && (   !ff_sfdelta_can_replace(sce0, nextband0, prev_mid, mididx, w*16+g)

  848.                             || !ff_sfdelta_can_replace(sce1, nextband1, prev_side, sididx, w*16+g))) {

  849.                         /* scalefactor range violation, bad stuff, will decrease quality unacceptably */

  850.                         continue;

  851.                     }

  852. 

  853.                     midcb = find_min_book(Mmax, mididx);

  854.                     sidcb = find_min_book(Smax, sididx);

  855. 

  856.                     /* No CB can be zero */

  857.                     midcb = FFMAX(1,midcb);

  858.                     sidcb = FFMAX(1,sidcb);

  859. 

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

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

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

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

  864.                         int b1,b2,b3,b4;

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

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

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

  868.                             S[i] =  M[i]

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

  870.                         }

  871. 

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

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

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

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

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

  877.                                                     L34,

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

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

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

  881.                                                     lambda / band0->threshold, INFINITY, &b1, NULL, 0);

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

  883.                                                     R34,

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

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

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

  887.                                                     lambda / band1->threshold, INFINITY, &b2, NULL, 0);

  888.                         dist2 += quantize_band_cost(s, M,

  889.                                                     M34,

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

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

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

  893.                                                     lambda / minthr, INFINITY, &b3, NULL, 0);

  894.                         dist2 += quantize_band_cost(s, S,

  895.                                                     S34,

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

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

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

  899.                                                     mslambda / (minthr * bmax), INFINITY, &b4, NULL, 0);

  900.                         B0 += b1+b2;

  901.                         B1 += b3+b4;

  902.                         dist1 -= B0;

  903.                         dist2 -= B1;

  904.                     }

  905.                     cpe->ms_mask[w*16+g] = dist2 <= dist1 && B1 < B0;

  906.                     if (cpe->ms_mask[w*16+g]) {

  907.                         /* Setting the M/S mask is useful with I/S or PNS, but only the flag */

  908.                         if (!cpe->is_mask[w*16+g] && sce0->band_type[w*16+g] != NOISE_BT && sce1->band_type[w*16+g] != NOISE_BT) {

  909.                             sce0->sf_idx[w*16+g] = mididx;

  910.                             sce1->sf_idx[w*16+g] = sididx;

  911.                             sce0->band_type[w*16+g] = midcb;

  912.                             sce1->band_type[w*16+g] = sidcb;

  913.                         }

  914.                         break;

  915.                     } else if (B1 > B0) {

  916.                         /* More boost won't fix this */

  917.                         break;

  918.                     }

  919.                 }

  920.             }

  921.             if (!sce0->zeroes[w*16+g] && sce0->band_type[w*16+g] < RESERVED_BT)

  922.                 prev_mid = sce0->sf_idx[w*16+g];

  923.             if (!sce1->zeroes[w*16+g] && !cpe->is_mask[w*16+g] && sce1->band_type[w*16+g] < RESERVED_BT)

  924.                 prev_side = sce1->sf_idx[w*16+g];

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

  926.         }

  927.     }

  928. }

  929. 

  930. AACCoefficientsEncoder ff_aac_coders[AAC_CODER_NB] = {

  931.     [AAC_CODER_FAAC] = {

  932.         search_for_quantizers_faac,

  933.         encode_window_bands_info,

  934.         quantize_and_encode_band,

  935.         ff_aac_encode_tns_info,

  936.         ff_aac_encode_ltp_info,

  937.         ff_aac_encode_main_pred,

  938.         ff_aac_adjust_common_pred,

  939.         ff_aac_adjust_common_ltp,

  940.         ff_aac_apply_main_pred,

  941.         ff_aac_apply_tns,

  942.         ff_aac_update_ltp,

  943.         ff_aac_ltp_insert_new_frame,

  944.         set_special_band_scalefactors,

  945.         search_for_pns,

  946.         mark_pns,

  947.         ff_aac_search_for_tns,

  948.         ff_aac_search_for_ltp,

  949.         search_for_ms,

  950.         ff_aac_search_for_is,

  951.         ff_aac_search_for_pred,

  952.     },

  953.     [AAC_CODER_ANMR] = {

  954.         search_for_quantizers_anmr,

  955.         encode_window_bands_info,

  956.         quantize_and_encode_band,

  957.         ff_aac_encode_tns_info,

  958.         ff_aac_encode_ltp_info,

  959.         ff_aac_encode_main_pred,

  960.         ff_aac_adjust_common_pred,

  961.         ff_aac_adjust_common_ltp,

  962.         ff_aac_apply_main_pred,

  963.         ff_aac_apply_tns,

  964.         ff_aac_update_ltp,

  965.         ff_aac_ltp_insert_new_frame,

  966.         set_special_band_scalefactors,

  967.         search_for_pns,

  968.         mark_pns,

  969.         ff_aac_search_for_tns,

  970.         ff_aac_search_for_ltp,

  971.         search_for_ms,

  972.         ff_aac_search_for_is,

  973.         ff_aac_search_for_pred,

  974.     },

  975.     [AAC_CODER_TWOLOOP] = {

  976.         search_for_quantizers_twoloop,

  977.         codebook_trellis_rate,

  978.         quantize_and_encode_band,

  979.         ff_aac_encode_tns_info,

  980.         ff_aac_encode_ltp_info,

  981.         ff_aac_encode_main_pred,

  982.         ff_aac_adjust_common_pred,

  983.         ff_aac_adjust_common_ltp,

  984.         ff_aac_apply_main_pred,

  985.         ff_aac_apply_tns,

  986.         ff_aac_update_ltp,

  987.         ff_aac_ltp_insert_new_frame,

  988.         set_special_band_scalefactors,

  989.         search_for_pns,

  990.         mark_pns,

  991.         ff_aac_search_for_tns,

  992.         ff_aac_search_for_ltp,

  993.         search_for_ms,

  994.         ff_aac_search_for_is,

  995.         ff_aac_search_for_pred,

  996.     },

  997.     [AAC_CODER_FAST] = {

  998.         search_for_quantizers_fast,

  999.         encode_window_bands_info,

  1000.         quantize_and_encode_band,

  1001.         ff_aac_encode_tns_info,

  1002.         ff_aac_encode_ltp_info,

  1003.         ff_aac_encode_main_pred,

  1004.         ff_aac_adjust_common_pred,

  1005.         ff_aac_adjust_common_ltp,

  1006.         ff_aac_apply_main_pred,

  1007.         ff_aac_apply_tns,

  1008.         ff_aac_update_ltp,

  1009.         ff_aac_ltp_insert_new_frame,

  1010.         set_special_band_scalefactors,

  1011.         search_for_pns,

  1012.         mark_pns,

  1013.         ff_aac_search_for_tns,

  1014.         ff_aac_search_for_ltp,

  1015.         search_for_ms,

  1016.         ff_aac_search_for_is,

  1017.         ff_aac_search_for_pred,

  1018.     },

  1019. };