falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
24465 Commits
32 Branches
283MB
Tree: a20639017b
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'a20639017b'
${ noResults }
FFmpeg/libavcodec/ps.c

1125 lines
40KB
Raw Blame History 

  1. /*

  2.  * MPEG-4 Parametric Stereo decoding functions

  3.  * Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>

  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. #include <stdint.h>

  23. #include "libavutil/mathematics.h"

  24. #include "avcodec.h"

  25. #include "get_bits.h"

  26. #include "ps.h"

  27. #include "ps_tablegen.h"

  28. #include "psdata.c"

  29. 

  30. #define PS_BASELINE 0

  31. 

  32. #define numQMFSlots 32 //numTimeSlots * RATE

  33. 

  34. static const int8_t num_env_tab[2][4] = {

  35.     { 0, 1, 2, 4, },

  36.     { 1, 2, 3, 4, },

  37. };

  38. 

  39. static const int8_t nr_iidicc_par_tab[] = {

  40.     10, 20, 34, 10, 20, 34,

  41. };

  42. 

  43. static const int8_t nr_iidopd_par_tab[] = {

  44.      5, 11, 17,  5, 11, 17,

  45. };

  46. 

  47. enum {

  48.     huff_iid_df1,

  49.     huff_iid_dt1,

  50.     huff_iid_df0,

  51.     huff_iid_dt0,

  52.     huff_icc_df,

  53.     huff_icc_dt,

  54.     huff_ipd_df,

  55.     huff_ipd_dt,

  56.     huff_opd_df,

  57.     huff_opd_dt,

  58. };

  59. 

  60. static const int huff_iid[] = {

  61.     huff_iid_df0,

  62.     huff_iid_df1,

  63.     huff_iid_dt0,

  64.     huff_iid_dt1,

  65. };

  66. 

  67. static VLC vlc_ps[10];

  68. 

  69. /**

  70.  * Read Inter-channel Intensity Difference parameters from the bitstream.

  71.  *

  72.  * @param avctx contains the current codec context

  73.  * @param gb    pointer to the input bitstream

  74.  * @param ps    pointer to the Parametric Stereo context

  75.  * @param e     envelope to decode

  76.  * @param dt    1: time delta-coded, 0: frequency delta-coded

  77.  */

  78. static int iid_data(AVCodecContext *avctx, GetBitContext *gb, PSContext *ps, int e, int dt)

  79. {

  80.     int b;

  81.     int table_idx = huff_iid[2*dt+ps->iid_quant];

  82.     VLC_TYPE (*vlc_table)[2] = vlc_ps[table_idx].table;

  83.     if (dt) {

  84.         int e_prev = e ? e - 1 : ps->num_env_old - 1;

  85.         e_prev = FFMAX(e_prev, 0);

  86.         for (b = 0; b < ps->nr_iid_par; b++) {

  87.             ps->iid_par[e][b] = ps->iid_par[e_prev][b] +

  88.                                 get_vlc2(gb, vlc_table, 9, 3) -

  89.                                 huff_offset[table_idx];

  90.             if (FFABS(ps->iid_par[e][b]) > 7 + 8 * ps->iid_quant)

  91.                 goto err;

  92.         }

  93.     } else {

  94.         int prev = 0;

  95.         for (b = 0; b < ps->nr_iid_par; b++) {

  96.             prev += get_vlc2(gb, vlc_table, 9, 3) -

  97.                     huff_offset[table_idx];

  98.             ps->iid_par[e][b] = prev;

  99.             if (FFABS(ps->iid_par[e][b]) > 7 + 8 * ps->iid_quant)

  100.                 goto err;

  101.         }

  102.     }

  103.     return 0;

  104. err:

  105.     av_log(avctx, AV_LOG_ERROR, "illegal iid\n");

  106.     return -1;

  107. }

  108. 

  109. /**

  110.  * Read Inter-Channel Coherence parameters from the bitstream.

  111.  *

  112.  * @param avctx contains the current codec context

  113.  * @param gb    pointer to the input bitstream

  114.  * @param ps    pointer to the Parametric Stereo context

  115.  * @param e     envelope to decode

  116.  * @param dt    1: time delta-coded, 0: frequency delta-coded

  117.  */

  118. static int icc_data(AVCodecContext *avctx, GetBitContext *gb, PSContext *ps, int e, int dt)

  119. {

  120.     int b;

  121.     int table_idx = dt ? huff_icc_dt : huff_icc_df;

  122.     VLC_TYPE (*vlc_table)[2] = vlc_ps[table_idx].table;

  123.     if (dt) {

  124.         int e_prev = e ? e - 1 : ps->num_env_old - 1;

  125.         e_prev = FFMAX(e_prev, 0);

  126.         for (b = 0; b < ps->nr_icc_par; b++) {

  127.             ps->icc_par[e][b] = ps->icc_par[e_prev][b] + get_vlc2(gb, vlc_table, 9, 3) - huff_offset[table_idx];

  128.             if (ps->icc_par[e][b] > 7U)

  129.                 goto err;

  130.         }

  131.     } else {

  132.         int prev = 0;

  133.         for (b = 0; b < ps->nr_icc_par; b++) {

  134.             prev += get_vlc2(gb, vlc_table, 9, 3) - huff_offset[table_idx];

  135.             ps->icc_par[e][b] = prev;

  136.             if (ps->icc_par[e][b] > 7U)

  137.                 goto err;

  138.         }

  139.     }

  140.     return 0;

  141. err:

  142.     av_log(avctx, AV_LOG_ERROR, "illegal icc\n");

  143.     return -1;

  144. }

  145. 

  146. /**

  147.  * Read Inter-channel Phase Difference parameters from the bitstream.

  148.  *

  149.  * @param gb    pointer to the input bitstream

  150.  * @param ps    pointer to the Parametric Stereo context

  151.  * @param e     envelope to decode

  152.  * @param dt    1: time delta-coded, 0: frequency delta-coded

  153.  */

  154. static void ipd_data(GetBitContext *gb, PSContext *ps, int e, int dt)

  155. {

  156.     int b;

  157.     int table_idx = dt ? huff_ipd_dt : huff_ipd_df;

  158.     VLC_TYPE (*vlc_table)[2] = vlc_ps[table_idx].table;

  159.     if (dt) {

  160.         int e_prev = e ? e - 1 : ps->num_env_old - 1;

  161.         e_prev = FFMAX(e_prev, 0);

  162.         for (b = 0; b < ps->nr_ipdopd_par; b++) {

  163.             ps->ipd_par[e][b] = (ps->ipd_par[e_prev][b] + get_vlc2(gb, vlc_table, 9, 1)) & 0x07;

  164.         }

  165.     } else {

  166.         int prev = 0;

  167.         for (b = 0; b < ps->nr_ipdopd_par; b++) {

  168.             prev += get_vlc2(gb, vlc_table, 9, 3);

  169.             prev &= 0x07;

  170.             ps->ipd_par[e][b] = prev;

  171.         }

  172.     }

  173. }

  174. 

  175. /**

  176.  * Read Overall Phase Difference parameters from the bitstream.

  177.  *

  178.  * @param gb    pointer to the input bitstream

  179.  * @param ps    pointer to the Parametric Stereo context

  180.  * @param e     envelope to decode

  181.  * @param dt    1: time delta-coded, 0: frequency delta-coded

  182.  */

  183. static void opd_data(GetBitContext *gb, PSContext *ps, int e, int dt)

  184. {

  185.     int b;

  186.     int table_idx = dt ? huff_opd_dt : huff_opd_df;

  187.     VLC_TYPE (*vlc_table)[2] = vlc_ps[table_idx].table;

  188.     if (dt) {

  189.         int e_prev = e ? e - 1 : ps->num_env_old - 1;

  190.         e_prev = FFMAX(e_prev, 0);

  191.         for (b = 0; b < ps->nr_ipdopd_par; b++) {

  192.             ps->opd_par[e][b] = (ps->opd_par[e_prev][b] + get_vlc2(gb, vlc_table, 9, 1)) & 0x07;

  193.         }

  194.     } else {

  195.         int prev = 0;

  196.         for (b = 0; b < ps->nr_ipdopd_par; b++) {

  197.             prev += get_vlc2(gb, vlc_table, 9, 3);

  198.             prev &= 0x07;

  199.             ps->opd_par[e][b] = prev;

  200.         }

  201.     }

  202. }

  203. 

  204. static int ps_extension(GetBitContext *gb, PSContext *ps, int ps_extension_id)

  205. {

  206.     int e;

  207.     int count = get_bits_count(gb);

  208. 

  209.     if (ps_extension_id)

  210.         return 0;

  211. 

  212.     ps->enable_ipdopd = get_bits1(gb);

  213.     if (ps->enable_ipdopd) {

  214.         for (e = 0; e < ps->num_env; e++) {

  215.             int dt = get_bits1(gb);

  216.             ipd_data(gb, ps, e, dt);

  217.             dt = get_bits1(gb);

  218.             opd_data(gb, ps, e, dt);

  219.         }

  220.     }

  221.     skip_bits1(gb);      //reserved_ps

  222.     return get_bits_count(gb) - count;

  223. }

  224. 

  225. static void ipdopd_reset(int8_t *opd_hist, int8_t *ipd_hist)

  226. {

  227.     int i;

  228.     for (i = 0; i < PS_MAX_NR_IPDOPD; i++) {

  229.         opd_hist[i] = 0;

  230.         ipd_hist[i] = 0;

  231.     }

  232. }

  233. 

  234. int ff_ps_read_data(AVCodecContext *avctx, GetBitContext *gb_host, PSContext *ps, int bits_left)

  235. {

  236.     int e;

  237.     int bit_count_start = get_bits_count(gb_host);

  238.     int header;

  239.     int bits_consumed;

  240.     GetBitContext gbc = *gb_host, *gb = &gbc;

  241. 

  242.     header = get_bits1(gb);

  243.     if (header) {     //enable_ps_header

  244.         ps->enable_iid = get_bits1(gb);

  245.         if (ps->enable_iid) {

  246.             ps->iid_mode = get_bits(gb, 3);

  247.             if (ps->iid_mode > 5) {

  248.                 av_log(avctx, AV_LOG_ERROR, "iid_mode %d is reserved.\n",

  249.                        ps->iid_mode);

  250.                 goto err;

  251.             }

  252.             ps->nr_iid_par    = nr_iidicc_par_tab[ps->iid_mode];

  253.             ps->iid_quant     = ps->iid_mode > 2;

  254.             ps->nr_ipdopd_par = nr_iidopd_par_tab[ps->iid_mode];

  255.         }

  256.         ps->enable_icc = get_bits1(gb);

  257.         if (ps->enable_icc) {

  258.             ps->icc_mode = get_bits(gb, 3);

  259.             if (ps->icc_mode > 5) {

  260.                 av_log(avctx, AV_LOG_ERROR, "icc_mode %d is reserved.\n",

  261.                        ps->icc_mode);

  262.                 goto err;

  263.             }

  264.             ps->nr_icc_par = nr_iidicc_par_tab[ps->icc_mode];

  265.         }

  266.         ps->enable_ext = get_bits1(gb);

  267.     }

  268. 

  269.     ps->frame_class = get_bits1(gb);

  270.     ps->num_env_old = ps->num_env;

  271.     ps->num_env     = num_env_tab[ps->frame_class][get_bits(gb, 2)];

  272. 

  273.     ps->border_position[0] = -1;

  274.     if (ps->frame_class) {

  275.         for (e = 1; e <= ps->num_env; e++)

  276.             ps->border_position[e] = get_bits(gb, 5);

  277.     } else

  278.         for (e = 1; e <= ps->num_env; e++)

  279.             ps->border_position[e] = e * numQMFSlots / ps->num_env - 1;

  280. 

  281.     if (ps->enable_iid) {

  282.         for (e = 0; e < ps->num_env; e++) {

  283.             int dt = get_bits1(gb);

  284.             if (iid_data(avctx, gb, ps, e, dt))

  285.                 goto err;

  286.         }

  287.     } else

  288.         memset(ps->iid_par, 0, sizeof(ps->iid_par));

  289. 

  290.     if (ps->enable_icc)

  291.         for (e = 0; e < ps->num_env; e++) {

  292.             int dt = get_bits1(gb);

  293.             if (icc_data(avctx, gb, ps, e, dt))

  294.                 goto err;

  295.         }

  296.     else

  297.         memset(ps->icc_par, 0, sizeof(ps->icc_par));

  298. 

  299.     if (ps->enable_ext) {

  300.         int cnt = get_bits(gb, 4);

  301.         if (cnt == 15) {

  302.             cnt += get_bits(gb, 8);

  303.         }

  304.         cnt *= 8;

  305.         while (cnt > 7) {

  306.             int ps_extension_id = get_bits(gb, 2);

  307.             cnt -= 2 + ps_extension(gb, ps, ps_extension_id);

  308.         }

  309.         if (cnt < 0) {

  310.             av_log(avctx, AV_LOG_ERROR, "ps extension overflow %d", cnt);

  311.             goto err;

  312.         }

  313.         skip_bits(gb, cnt);

  314.     }

  315. 

  316.     ps->enable_ipdopd &= !PS_BASELINE;

  317. 

  318.     //Fix up envelopes

  319.     if (!ps->num_env || ps->border_position[ps->num_env] < numQMFSlots - 1) {

  320.         //Create a fake envelope

  321.         int source = ps->num_env ? ps->num_env - 1 : ps->num_env_old - 1;

  322.         if (source >= 0 && source != ps->num_env) {

  323.             if (ps->enable_iid && ps->num_env_old > 1) {

  324.                 memcpy(ps->iid_par+ps->num_env, ps->iid_par+source, sizeof(ps->iid_par[0]));

  325.             }

  326.             if (ps->enable_icc && ps->num_env_old > 1) {

  327.                 memcpy(ps->icc_par+ps->num_env, ps->icc_par+source, sizeof(ps->icc_par[0]));

  328.             }

  329.             if (ps->enable_ipdopd && ps->num_env_old > 1) {

  330.                 memcpy(ps->ipd_par+ps->num_env, ps->ipd_par+source, sizeof(ps->ipd_par[0]));

  331.                 memcpy(ps->opd_par+ps->num_env, ps->opd_par+source, sizeof(ps->opd_par[0]));

  332.             }

  333.         }

  334.         ps->num_env++;

  335.         ps->border_position[ps->num_env] = numQMFSlots - 1;

  336.     }

  337. 

  338. 

  339.     ps->is34bands_old = ps->is34bands;

  340.     if (!PS_BASELINE && (ps->enable_iid || ps->enable_icc))

  341.         ps->is34bands = (ps->enable_iid && ps->nr_iid_par == 34) ||

  342.                         (ps->enable_icc && ps->nr_icc_par == 34);

  343. 

  344.     //Baseline

  345.     if (!ps->enable_ipdopd) {

  346.         memset(ps->ipd_par, 0, sizeof(ps->ipd_par));

  347.         memset(ps->opd_par, 0, sizeof(ps->opd_par));

  348.     }

  349. 

  350.     if (header)

  351.         ps->start = 1;

  352. 

  353.     bits_consumed = get_bits_count(gb) - bit_count_start;

  354.     if (bits_consumed <= bits_left) {

  355.         skip_bits_long(gb_host, bits_consumed);

  356.         return bits_consumed;

  357.     }

  358.     av_log(avctx, AV_LOG_ERROR, "Expected to read %d PS bits actually read %d.\n", bits_left, bits_consumed);

  359. err:

  360.     ps->start = 0;

  361.     skip_bits_long(gb_host, bits_left);

  362.     return bits_left;

  363. }

  364. 

  365. /** Split one subband into 2 subsubbands with a symmetric real filter.

  366.  * The filter must have its non-center even coefficients equal to zero. */

  367. static void hybrid2_re(float (*in)[2], float (*out)[32][2], const float filter[7], int len, int reverse)

  368. {

  369.     int i, j;

  370.     for (i = 0; i < len; i++) {

  371.         float re_in = filter[6] * in[6+i][0];        //real inphase

  372.         float re_op = 0.0f;                          //real out of phase

  373.         float im_in = filter[6] * in[6+i][1];        //imag inphase

  374.         float im_op = 0.0f;                          //imag out of phase

  375.         for (j = 0; j < 6; j += 2) {

  376.             re_op += filter[j+1] * (in[i+j+1][0] + in[12-j-1+i][0]);

  377.             im_op += filter[j+1] * (in[i+j+1][1] + in[12-j-1+i][1]);

  378.         }

  379.         out[ reverse][i][0] = re_in + re_op;

  380.         out[ reverse][i][1] = im_in + im_op;

  381.         out[!reverse][i][0] = re_in - re_op;

  382.         out[!reverse][i][1] = im_in - im_op;

  383.     }

  384. }

  385. 

  386. /** Split one subband into 6 subsubbands with a complex filter */

  387. static void hybrid6_cx(float (*in)[2], float (*out)[32][2], const float (*filter)[7][2], int len)

  388. {

  389.     int i, j, ssb;

  390.     int N = 8;

  391.     float temp[8][2];

  392. 

  393.     for (i = 0; i < len; i++) {

  394.         for (ssb = 0; ssb < N; ssb++) {

  395.             float sum_re = filter[ssb][6][0] * in[i+6][0], sum_im = filter[ssb][6][0] * in[i+6][1];

  396.             for (j = 0; j < 6; j++) {

  397.                 float in0_re = in[i+j][0];

  398.                 float in0_im = in[i+j][1];

  399.                 float in1_re = in[i+12-j][0];

  400.                 float in1_im = in[i+12-j][1];

  401.                 sum_re += filter[ssb][j][0] * (in0_re + in1_re) - filter[ssb][j][1] * (in0_im - in1_im);

  402.                 sum_im += filter[ssb][j][0] * (in0_im + in1_im) + filter[ssb][j][1] * (in0_re - in1_re);

  403.             }

  404.             temp[ssb][0] = sum_re;

  405.             temp[ssb][1] = sum_im;

  406.         }

  407.         out[0][i][0] = temp[6][0];

  408.         out[0][i][1] = temp[6][1];

  409.         out[1][i][0] = temp[7][0];

  410.         out[1][i][1] = temp[7][1];

  411.         out[2][i][0] = temp[0][0];

  412.         out[2][i][1] = temp[0][1];

  413.         out[3][i][0] = temp[1][0];

  414.         out[3][i][1] = temp[1][1];

  415.         out[4][i][0] = temp[2][0] + temp[5][0];

  416.         out[4][i][1] = temp[2][1] + temp[5][1];

  417.         out[5][i][0] = temp[3][0] + temp[4][0];

  418.         out[5][i][1] = temp[3][1] + temp[4][1];

  419.     }

  420. }

  421. 

  422. static void hybrid4_8_12_cx(float (*in)[2], float (*out)[32][2], const float (*filter)[7][2], int N, int len)

  423. {

  424.     int i, j, ssb;

  425. 

  426.     for (i = 0; i < len; i++) {

  427.         for (ssb = 0; ssb < N; ssb++) {

  428.             float sum_re = filter[ssb][6][0] * in[i+6][0], sum_im = filter[ssb][6][0] * in[i+6][1];

  429.             for (j = 0; j < 6; j++) {

  430.                 float in0_re = in[i+j][0];

  431.                 float in0_im = in[i+j][1];

  432.                 float in1_re = in[i+12-j][0];

  433.                 float in1_im = in[i+12-j][1];

  434.                 sum_re += filter[ssb][j][0] * (in0_re + in1_re) - filter[ssb][j][1] * (in0_im - in1_im);

  435.                 sum_im += filter[ssb][j][0] * (in0_im + in1_im) + filter[ssb][j][1] * (in0_re - in1_re);

  436.             }

  437.             out[ssb][i][0] = sum_re;

  438.             out[ssb][i][1] = sum_im;

  439.         }

  440.     }

  441. }

  442. 

  443. static void hybrid_analysis(float out[91][32][2], float in[5][44][2], float L[2][38][64], int is34, int len)

  444. {

  445.     int i, j;

  446.     for (i = 0; i < 5; i++) {

  447.         for (j = 0; j < 38; j++) {

  448.             in[i][j+6][0] = L[0][j][i];

  449.             in[i][j+6][1] = L[1][j][i];

  450.         }

  451.     }

  452.     if(is34) {

  453.         hybrid4_8_12_cx(in[0], out,    f34_0_12, 12, len);

  454.         hybrid4_8_12_cx(in[1], out+12, f34_1_8,   8, len);

  455.         hybrid4_8_12_cx(in[2], out+20, f34_2_4,   4, len);

  456.         hybrid4_8_12_cx(in[3], out+24, f34_2_4,   4, len);

  457.         hybrid4_8_12_cx(in[4], out+28, f34_2_4,   4, len);

  458.         for (i = 0; i < 59; i++) {

  459.             for (j = 0; j < len; j++) {

  460.                 out[i+32][j][0] = L[0][j][i+5];

  461.                 out[i+32][j][1] = L[1][j][i+5];

  462.             }

  463.         }

  464.     } else {

  465.         hybrid6_cx(in[0], out, f20_0_8, len);

  466.         hybrid2_re(in[1], out+6, g1_Q2, len, 1);

  467.         hybrid2_re(in[2], out+8, g1_Q2, len, 0);

  468.         for (i = 0; i < 61; i++) {

  469.             for (j = 0; j < len; j++) {

  470.                 out[i+10][j][0] = L[0][j][i+3];

  471.                 out[i+10][j][1] = L[1][j][i+3];

  472.             }

  473.         }

  474.     }

  475.     //update in_buf

  476.     for (i = 0; i < 5; i++) {

  477.         memcpy(in[i], in[i]+32, 6 * sizeof(in[i][0]));

  478.     }

  479. }

  480. 

  481. static void hybrid_synthesis(float out[2][38][64], float in[91][32][2], int is34, int len)

  482. {

  483.     int i, n;

  484.     if(is34) {

  485.         for (n = 0; n < len; n++) {

  486.             memset(out[0][n], 0, 5*sizeof(out[0][n][0]));

  487.             memset(out[1][n], 0, 5*sizeof(out[1][n][0]));

  488.             for(i = 0; i < 12; i++) {

  489.                 out[0][n][0] += in[   i][n][0];

  490.                 out[1][n][0] += in[   i][n][1];

  491.             }

  492.             for(i = 0; i < 8; i++) {

  493.                 out[0][n][1] += in[12+i][n][0];

  494.                 out[1][n][1] += in[12+i][n][1];

  495.             }

  496.             for(i = 0; i < 4; i++) {

  497.                 out[0][n][2] += in[20+i][n][0];

  498.                 out[1][n][2] += in[20+i][n][1];

  499.                 out[0][n][3] += in[24+i][n][0];

  500.                 out[1][n][3] += in[24+i][n][1];

  501.                 out[0][n][4] += in[28+i][n][0];

  502.                 out[1][n][4] += in[28+i][n][1];

  503.             }

  504.         }

  505.         for (i = 0; i < 59; i++) {

  506.             for (n = 0; n < len; n++) {

  507.                 out[0][n][i+5] = in[i+32][n][0];

  508.                 out[1][n][i+5] = in[i+32][n][1];

  509.             }

  510.         }

  511.     } else {

  512.         for (n = 0; n < len; n++) {

  513.             out[0][n][0] = in[0][n][0] + in[1][n][0] + in[2][n][0] +

  514.                            in[3][n][0] + in[4][n][0] + in[5][n][0];

  515.             out[1][n][0] = in[0][n][1] + in[1][n][1] + in[2][n][1] +

  516.                            in[3][n][1] + in[4][n][1] + in[5][n][1];

  517.             out[0][n][1] = in[6][n][0] + in[7][n][0];

  518.             out[1][n][1] = in[6][n][1] + in[7][n][1];

  519.             out[0][n][2] = in[8][n][0] + in[9][n][0];

  520.             out[1][n][2] = in[8][n][1] + in[9][n][1];

  521.         }

  522.         for (i = 0; i < 61; i++) {

  523.             for (n = 0; n < len; n++) {

  524.                 out[0][n][i+3] = in[i+10][n][0];

  525.                 out[1][n][i+3] = in[i+10][n][1];

  526.             }

  527.         }

  528.     }

  529. }

  530. 

  531. /// All-pass filter decay slope

  532. #define DECAY_SLOPE      0.05f

  533. /// Number of frequency bands that can be addressed by the parameter index, b(k)

  534. static const int   NR_PAR_BANDS[]      = { 20, 34 };

  535. /// Number of frequency bands that can be addressed by the sub subband index, k

  536. static const int   NR_BANDS[]          = { 71, 91 };

  537. /// Start frequency band for the all-pass filter decay slope

  538. static const int   DECAY_CUTOFF[]      = { 10, 32 };

  539. /// Number of all-pass filer bands

  540. static const int   NR_ALLPASS_BANDS[]  = { 30, 50 };

  541. /// First stereo band using the short one sample delay

  542. static const int   SHORT_DELAY_BAND[]  = { 42, 62 };

  543. 

  544. /** Table 8.46 */

  545. static void map_idx_10_to_20(int8_t *par_mapped, const int8_t *par, int full)

  546. {

  547.     int b;

  548.     if (full)

  549.         b = 9;

  550.     else {

  551.         b = 4;

  552.         par_mapped[10] = 0;

  553.     }

  554.     for (; b >= 0; b--) {

  555.         par_mapped[2*b+1] = par_mapped[2*b] = par[b];

  556.     }

  557. }

  558. 

  559. static void map_idx_34_to_20(int8_t *par_mapped, const int8_t *par, int full)

  560. {

  561.     par_mapped[ 0] = (2*par[ 0] +   par[ 1]) / 3;

  562.     par_mapped[ 1] = (  par[ 1] + 2*par[ 2]) / 3;

  563.     par_mapped[ 2] = (2*par[ 3] +   par[ 4]) / 3;

  564.     par_mapped[ 3] = (  par[ 4] + 2*par[ 5]) / 3;

  565.     par_mapped[ 4] = (  par[ 6] +   par[ 7]) / 2;

  566.     par_mapped[ 5] = (  par[ 8] +   par[ 9]) / 2;

  567.     par_mapped[ 6] =    par[10];

  568.     par_mapped[ 7] =    par[11];

  569.     par_mapped[ 8] = (  par[12] +   par[13]) / 2;

  570.     par_mapped[ 9] = (  par[14] +   par[15]) / 2;

  571.     par_mapped[10] =    par[16];

  572.     if (full) {

  573.         par_mapped[11] =    par[17];

  574.         par_mapped[12] =    par[18];

  575.         par_mapped[13] =    par[19];

  576.         par_mapped[14] = (  par[20] +   par[21]) / 2;

  577.         par_mapped[15] = (  par[22] +   par[23]) / 2;

  578.         par_mapped[16] = (  par[24] +   par[25]) / 2;

  579.         par_mapped[17] = (  par[26] +   par[27]) / 2;

  580.         par_mapped[18] = (  par[28] +   par[29] +   par[30] +   par[31]) / 4;

  581.         par_mapped[19] = (  par[32] +   par[33]) / 2;

  582.     }

  583. }

  584. 

  585. static void map_val_34_to_20(float par[PS_MAX_NR_IIDICC])

  586. {

  587.     par[ 0] = (2*par[ 0] +   par[ 1]) * 0.33333333f;

  588.     par[ 1] = (  par[ 1] + 2*par[ 2]) * 0.33333333f;

  589.     par[ 2] = (2*par[ 3] +   par[ 4]) * 0.33333333f;

  590.     par[ 3] = (  par[ 4] + 2*par[ 5]) * 0.33333333f;

  591.     par[ 4] = (  par[ 6] +   par[ 7]) * 0.5f;

  592.     par[ 5] = (  par[ 8] +   par[ 9]) * 0.5f;

  593.     par[ 6] =    par[10];

  594.     par[ 7] =    par[11];

  595.     par[ 8] = (  par[12] +   par[13]) * 0.5f;

  596.     par[ 9] = (  par[14] +   par[15]) * 0.5f;

  597.     par[10] =    par[16];

  598.     par[11] =    par[17];

  599.     par[12] =    par[18];

  600.     par[13] =    par[19];

  601.     par[14] = (  par[20] +   par[21]) * 0.5f;

  602.     par[15] = (  par[22] +   par[23]) * 0.5f;

  603.     par[16] = (  par[24] +   par[25]) * 0.5f;

  604.     par[17] = (  par[26] +   par[27]) * 0.5f;

  605.     par[18] = (  par[28] +   par[29] +   par[30] +   par[31]) * 0.25f;

  606.     par[19] = (  par[32] +   par[33]) * 0.5f;

  607. }

  608. 

  609. static void map_idx_10_to_34(int8_t *par_mapped, const int8_t *par, int full)

  610. {

  611.     if (full) {

  612.         par_mapped[33] = par[9];

  613.         par_mapped[32] = par[9];

  614.         par_mapped[31] = par[9];

  615.         par_mapped[30] = par[9];

  616.         par_mapped[29] = par[9];

  617.         par_mapped[28] = par[9];

  618.         par_mapped[27] = par[8];

  619.         par_mapped[26] = par[8];

  620.         par_mapped[25] = par[8];

  621.         par_mapped[24] = par[8];

  622.         par_mapped[23] = par[7];

  623.         par_mapped[22] = par[7];

  624.         par_mapped[21] = par[7];

  625.         par_mapped[20] = par[7];

  626.         par_mapped[19] = par[6];

  627.         par_mapped[18] = par[6];

  628.         par_mapped[17] = par[5];

  629.         par_mapped[16] = par[5];

  630.     } else {

  631.         par_mapped[16] =      0;

  632.     }

  633.     par_mapped[15] = par[4];

  634.     par_mapped[14] = par[4];

  635.     par_mapped[13] = par[4];

  636.     par_mapped[12] = par[4];

  637.     par_mapped[11] = par[3];

  638.     par_mapped[10] = par[3];

  639.     par_mapped[ 9] = par[2];

  640.     par_mapped[ 8] = par[2];

  641.     par_mapped[ 7] = par[2];

  642.     par_mapped[ 6] = par[2];

  643.     par_mapped[ 5] = par[1];

  644.     par_mapped[ 4] = par[1];

  645.     par_mapped[ 3] = par[1];

  646.     par_mapped[ 2] = par[0];

  647.     par_mapped[ 1] = par[0];

  648.     par_mapped[ 0] = par[0];

  649. }

  650. 

  651. static void map_idx_20_to_34(int8_t *par_mapped, const int8_t *par, int full)

  652. {

  653.     if (full) {

  654.         par_mapped[33] =  par[19];

  655.         par_mapped[32] =  par[19];

  656.         par_mapped[31] =  par[18];

  657.         par_mapped[30] =  par[18];

  658.         par_mapped[29] =  par[18];

  659.         par_mapped[28] =  par[18];

  660.         par_mapped[27] =  par[17];

  661.         par_mapped[26] =  par[17];

  662.         par_mapped[25] =  par[16];

  663.         par_mapped[24] =  par[16];

  664.         par_mapped[23] =  par[15];

  665.         par_mapped[22] =  par[15];

  666.         par_mapped[21] =  par[14];

  667.         par_mapped[20] =  par[14];

  668.         par_mapped[19] =  par[13];

  669.         par_mapped[18] =  par[12];

  670.         par_mapped[17] =  par[11];

  671.     }

  672.     par_mapped[16] =  par[10];

  673.     par_mapped[15] =  par[ 9];

  674.     par_mapped[14] =  par[ 9];

  675.     par_mapped[13] =  par[ 8];

  676.     par_mapped[12] =  par[ 8];

  677.     par_mapped[11] =  par[ 7];

  678.     par_mapped[10] =  par[ 6];

  679.     par_mapped[ 9] =  par[ 5];

  680.     par_mapped[ 8] =  par[ 5];

  681.     par_mapped[ 7] =  par[ 4];

  682.     par_mapped[ 6] =  par[ 4];

  683.     par_mapped[ 5] =  par[ 3];

  684.     par_mapped[ 4] = (par[ 2] + par[ 3]) / 2;

  685.     par_mapped[ 3] =  par[ 2];

  686.     par_mapped[ 2] =  par[ 1];

  687.     par_mapped[ 1] = (par[ 0] + par[ 1]) / 2;

  688.     par_mapped[ 0] =  par[ 0];

  689. }

  690. 

  691. static void map_val_20_to_34(float par[PS_MAX_NR_IIDICC])

  692. {

  693.     par[33] =  par[19];

  694.     par[32] =  par[19];

  695.     par[31] =  par[18];

  696.     par[30] =  par[18];

  697.     par[29] =  par[18];

  698.     par[28] =  par[18];

  699.     par[27] =  par[17];

  700.     par[26] =  par[17];

  701.     par[25] =  par[16];

  702.     par[24] =  par[16];

  703.     par[23] =  par[15];

  704.     par[22] =  par[15];

  705.     par[21] =  par[14];

  706.     par[20] =  par[14];

  707.     par[19] =  par[13];

  708.     par[18] =  par[12];

  709.     par[17] =  par[11];

  710.     par[16] =  par[10];

  711.     par[15] =  par[ 9];

  712.     par[14] =  par[ 9];

  713.     par[13] =  par[ 8];

  714.     par[12] =  par[ 8];

  715.     par[11] =  par[ 7];

  716.     par[10] =  par[ 6];

  717.     par[ 9] =  par[ 5];

  718.     par[ 8] =  par[ 5];

  719.     par[ 7] =  par[ 4];

  720.     par[ 6] =  par[ 4];

  721.     par[ 5] =  par[ 3];

  722.     par[ 4] = (par[ 2] + par[ 3]) * 0.5f;

  723.     par[ 3] =  par[ 2];

  724.     par[ 2] =  par[ 1];

  725.     par[ 1] = (par[ 0] + par[ 1]) * 0.5f;

  726.     par[ 0] =  par[ 0];

  727. }

  728. 

  729. static void decorrelation(PSContext *ps, float (*out)[32][2], const float (*s)[32][2], int is34)

  730. {

  731.     float power[34][PS_QMF_TIME_SLOTS] = {{0}};

  732.     float transient_gain[34][PS_QMF_TIME_SLOTS];

  733.     float *peak_decay_nrg = ps->peak_decay_nrg;

  734.     float *power_smooth = ps->power_smooth;

  735.     float *peak_decay_diff_smooth = ps->peak_decay_diff_smooth;

  736.     float (*delay)[PS_QMF_TIME_SLOTS + PS_MAX_DELAY][2] = ps->delay;

  737.     float (*ap_delay)[PS_AP_LINKS][PS_QMF_TIME_SLOTS + PS_MAX_AP_DELAY][2] = ps->ap_delay;

  738.     const int8_t *k_to_i = is34 ? k_to_i_34 : k_to_i_20;

  739.     const float peak_decay_factor = 0.76592833836465f;

  740.     const float transient_impact  = 1.5f;

  741.     const float a_smooth          = 0.25f; //< Smoothing coefficient

  742.     int i, k, m, n;

  743.     int n0 = 0, nL = 32;

  744.     static const int link_delay[] = { 3, 4, 5 };

  745.     static const float a[] = { 0.65143905753106f,

  746.                                0.56471812200776f,

  747.                                0.48954165955695f };

  748. 

  749.     if (is34 != ps->is34bands_old) {

  750.         memset(ps->peak_decay_nrg,         0, sizeof(ps->peak_decay_nrg));

  751.         memset(ps->power_smooth,           0, sizeof(ps->power_smooth));

  752.         memset(ps->peak_decay_diff_smooth, 0, sizeof(ps->peak_decay_diff_smooth));

  753.         memset(ps->delay,                  0, sizeof(ps->delay));

  754.         memset(ps->ap_delay,               0, sizeof(ps->ap_delay));

  755.     }

  756. 

  757.     for (n = n0; n < nL; n++) {

  758.         for (k = 0; k < NR_BANDS[is34]; k++) {

  759.             int i = k_to_i[k];

  760.             power[i][n] += s[k][n][0] * s[k][n][0] + s[k][n][1] * s[k][n][1];

  761.         }

  762.     }

  763. 

  764.     //Transient detection

  765.     for (i = 0; i < NR_PAR_BANDS[is34]; i++) {

  766.         for (n = n0; n < nL; n++) {

  767.             float decayed_peak = peak_decay_factor * peak_decay_nrg[i];

  768.             float denom;

  769.             peak_decay_nrg[i] = FFMAX(decayed_peak, power[i][n]);

  770.             power_smooth[i] += a_smooth * (power[i][n] - power_smooth[i]);

  771.             peak_decay_diff_smooth[i] += a_smooth * (peak_decay_nrg[i] - power[i][n] - peak_decay_diff_smooth[i]);

  772.             denom = transient_impact * peak_decay_diff_smooth[i];

  773.             transient_gain[i][n]   = (denom > power_smooth[i]) ?

  774.                                          power_smooth[i] / denom : 1.0f;

  775.         }

  776.     }

  777. 

  778.     //Decorrelation and transient reduction

  779.     //                         PS_AP_LINKS - 1

  780.     //                               -----

  781.     //                                | |  Q_fract_allpass[k][m]*z^-link_delay[m] - a[m]*g_decay_slope[k]

  782.     //H[k][z] = z^-2 * phi_fract[k] * | | ----------------------------------------------------------------

  783.     //                                | | 1 - a[m]*g_decay_slope[k]*Q_fract_allpass[k][m]*z^-link_delay[m]

  784.     //                               m = 0

  785.     //d[k][z] (out) = transient_gain_mapped[k][z] * H[k][z] * s[k][z]

  786.     for (k = 0; k < NR_ALLPASS_BANDS[is34]; k++) {

  787.         int b = k_to_i[k];

  788.         float g_decay_slope = 1.f - DECAY_SLOPE * (k - DECAY_CUTOFF[is34]);

  789.         float ag[PS_AP_LINKS];

  790.         g_decay_slope = av_clipf(g_decay_slope, 0.f, 1.f);

  791.         memcpy(delay[k], delay[k]+nL, PS_MAX_DELAY*sizeof(delay[k][0]));

  792.         memcpy(delay[k]+PS_MAX_DELAY, s[k], numQMFSlots*sizeof(delay[k][0]));

  793.         for (m = 0; m < PS_AP_LINKS; m++) {

  794.             memcpy(ap_delay[k][m],   ap_delay[k][m]+numQMFSlots,           5*sizeof(ap_delay[k][m][0]));

  795.             ag[m] = a[m] * g_decay_slope;

  796.         }

  797.         for (n = n0; n < nL; n++) {

  798.             float in_re = delay[k][n+PS_MAX_DELAY-2][0] * phi_fract[is34][k][0] -

  799.                           delay[k][n+PS_MAX_DELAY-2][1] * phi_fract[is34][k][1];

  800.             float in_im = delay[k][n+PS_MAX_DELAY-2][0] * phi_fract[is34][k][1] +

  801.                           delay[k][n+PS_MAX_DELAY-2][1] * phi_fract[is34][k][0];

  802.             for (m = 0; m < PS_AP_LINKS; m++) {

  803.                 float a_re                = ag[m] * in_re;

  804.                 float a_im                = ag[m] * in_im;

  805.                 float link_delay_re       = ap_delay[k][m][n+5-link_delay[m]][0];

  806.                 float link_delay_im       = ap_delay[k][m][n+5-link_delay[m]][1];

  807.                 float fractional_delay_re = Q_fract_allpass[is34][k][m][0];

  808.                 float fractional_delay_im = Q_fract_allpass[is34][k][m][1];

  809.                 ap_delay[k][m][n+5][0] = in_re;

  810.                 ap_delay[k][m][n+5][1] = in_im;

  811.                 in_re = link_delay_re * fractional_delay_re - link_delay_im * fractional_delay_im - a_re;

  812.                 in_im = link_delay_re * fractional_delay_im + link_delay_im * fractional_delay_re - a_im;

  813.                 ap_delay[k][m][n+5][0] += ag[m] * in_re;

  814.                 ap_delay[k][m][n+5][1] += ag[m] * in_im;

  815.             }

  816.             out[k][n][0] = transient_gain[b][n] * in_re;

  817.             out[k][n][1] = transient_gain[b][n] * in_im;

  818.         }

  819.     }

  820.     for (; k < SHORT_DELAY_BAND[is34]; k++) {

  821.         memcpy(delay[k], delay[k]+nL, PS_MAX_DELAY*sizeof(delay[k][0]));

  822.         memcpy(delay[k]+PS_MAX_DELAY, s[k], numQMFSlots*sizeof(delay[k][0]));

  823.         for (n = n0; n < nL; n++) {

  824.             //H = delay 14

  825.             out[k][n][0] = transient_gain[k_to_i[k]][n] * delay[k][n+PS_MAX_DELAY-14][0];

  826.             out[k][n][1] = transient_gain[k_to_i[k]][n] * delay[k][n+PS_MAX_DELAY-14][1];

  827.         }

  828.     }

  829.     for (; k < NR_BANDS[is34]; k++) {

  830.         memcpy(delay[k], delay[k]+nL, PS_MAX_DELAY*sizeof(delay[k][0]));

  831.         memcpy(delay[k]+PS_MAX_DELAY, s[k], numQMFSlots*sizeof(delay[k][0]));

  832.         for (n = n0; n < nL; n++) {

  833.             //H = delay 1

  834.             out[k][n][0] = transient_gain[k_to_i[k]][n] * delay[k][n+PS_MAX_DELAY-1][0];

  835.             out[k][n][1] = transient_gain[k_to_i[k]][n] * delay[k][n+PS_MAX_DELAY-1][1];

  836.         }

  837.     }

  838. }

  839. 

  840. static void remap34(int8_t (**p_par_mapped)[PS_MAX_NR_IIDICC],

  841.                     int8_t           (*par)[PS_MAX_NR_IIDICC],

  842.                     int num_par, int num_env, int full)

  843. {

  844.     int8_t (*par_mapped)[PS_MAX_NR_IIDICC] = *p_par_mapped;

  845.     int e;

  846.     if (num_par == 20 || num_par == 11) {

  847.         for (e = 0; e < num_env; e++) {

  848.             map_idx_20_to_34(par_mapped[e], par[e], full);

  849.         }

  850.     } else if (num_par == 10 || num_par == 5) {

  851.         for (e = 0; e < num_env; e++) {

  852.             map_idx_10_to_34(par_mapped[e], par[e], full);

  853.         }

  854.     } else {

  855.         *p_par_mapped = par;

  856.     }

  857. }

  858. 

  859. static void remap20(int8_t (**p_par_mapped)[PS_MAX_NR_IIDICC],

  860.                     int8_t           (*par)[PS_MAX_NR_IIDICC],

  861.                     int num_par, int num_env, int full)

  862. {

  863.     int8_t (*par_mapped)[PS_MAX_NR_IIDICC] = *p_par_mapped;

  864.     int e;

  865.     if (num_par == 34 || num_par == 17) {

  866.         for (e = 0; e < num_env; e++) {

  867.             map_idx_34_to_20(par_mapped[e], par[e], full);

  868.         }

  869.     } else if (num_par == 10 || num_par == 5) {

  870.         for (e = 0; e < num_env; e++) {

  871.             map_idx_10_to_20(par_mapped[e], par[e], full);

  872.         }

  873.     } else {

  874.         *p_par_mapped = par;

  875.     }

  876. }

  877. 

  878. static void stereo_processing(PSContext *ps, float (*l)[32][2], float (*r)[32][2], int is34)

  879. {

  880.     int e, b, k, n;

  881. 

  882.     float (*H11)[PS_MAX_NUM_ENV+1][PS_MAX_NR_IIDICC] = ps->H11;

  883.     float (*H12)[PS_MAX_NUM_ENV+1][PS_MAX_NR_IIDICC] = ps->H12;

  884.     float (*H21)[PS_MAX_NUM_ENV+1][PS_MAX_NR_IIDICC] = ps->H21;

  885.     float (*H22)[PS_MAX_NUM_ENV+1][PS_MAX_NR_IIDICC] = ps->H22;

  886.     int8_t *opd_hist = ps->opd_hist;

  887.     int8_t *ipd_hist = ps->ipd_hist;

  888.     int8_t iid_mapped_buf[PS_MAX_NUM_ENV][PS_MAX_NR_IIDICC];

  889.     int8_t icc_mapped_buf[PS_MAX_NUM_ENV][PS_MAX_NR_IIDICC];

  890.     int8_t ipd_mapped_buf[PS_MAX_NUM_ENV][PS_MAX_NR_IIDICC];

  891.     int8_t opd_mapped_buf[PS_MAX_NUM_ENV][PS_MAX_NR_IIDICC];

  892.     int8_t (*iid_mapped)[PS_MAX_NR_IIDICC] = iid_mapped_buf;

  893.     int8_t (*icc_mapped)[PS_MAX_NR_IIDICC] = icc_mapped_buf;

  894.     int8_t (*ipd_mapped)[PS_MAX_NR_IIDICC] = ipd_mapped_buf;

  895.     int8_t (*opd_mapped)[PS_MAX_NR_IIDICC] = opd_mapped_buf;

  896.     const int8_t *k_to_i = is34 ? k_to_i_34 : k_to_i_20;

  897.     const float (*H_LUT)[8][4] = (PS_BASELINE || ps->icc_mode < 3) ? HA : HB;

  898. 

  899.     //Remapping

  900.     for (b = 0; b < PS_MAX_NR_IIDICC; b++) {

  901.         H11[0][0][b] = H11[0][ps->num_env_old][b];

  902.         H12[0][0][b] = H12[0][ps->num_env_old][b];

  903.         H21[0][0][b] = H21[0][ps->num_env_old][b];

  904.         H22[0][0][b] = H22[0][ps->num_env_old][b];

  905.         H11[1][0][b] = H11[1][ps->num_env_old][b];

  906.         H12[1][0][b] = H12[1][ps->num_env_old][b];

  907.         H21[1][0][b] = H21[1][ps->num_env_old][b];

  908.         H22[1][0][b] = H22[1][ps->num_env_old][b];

  909.     }

  910.     if (is34) {

  911.         remap34(&iid_mapped, ps->iid_par, ps->nr_iid_par, ps->num_env, 1);

  912.         remap34(&icc_mapped, ps->icc_par, ps->nr_icc_par, ps->num_env, 1);

  913.         if (ps->enable_ipdopd) {

  914.             remap34(&ipd_mapped, ps->ipd_par, ps->nr_ipdopd_par, ps->num_env, 0);

  915.             remap34(&opd_mapped, ps->opd_par, ps->nr_ipdopd_par, ps->num_env, 0);

  916.         }

  917.         if (!ps->is34bands_old) {

  918.             map_val_20_to_34(H11[0][0]);

  919.             map_val_20_to_34(H11[1][0]);

  920.             map_val_20_to_34(H12[0][0]);

  921.             map_val_20_to_34(H12[1][0]);

  922.             map_val_20_to_34(H21[0][0]);

  923.             map_val_20_to_34(H21[1][0]);

  924.             map_val_20_to_34(H22[0][0]);

  925.             map_val_20_to_34(H22[1][0]);

  926.             ipdopd_reset(ipd_hist, opd_hist);

  927.         }

  928.     } else {

  929.         remap20(&iid_mapped, ps->iid_par, ps->nr_iid_par, ps->num_env, 1);

  930.         remap20(&icc_mapped, ps->icc_par, ps->nr_icc_par, ps->num_env, 1);

  931.         if (ps->enable_ipdopd) {

  932.             remap20(&ipd_mapped, ps->ipd_par, ps->nr_ipdopd_par, ps->num_env, 0);

  933.             remap20(&opd_mapped, ps->opd_par, ps->nr_ipdopd_par, ps->num_env, 0);

  934.         }

  935.         if (ps->is34bands_old) {

  936.             map_val_34_to_20(H11[0][0]);

  937.             map_val_34_to_20(H11[1][0]);

  938.             map_val_34_to_20(H12[0][0]);

  939.             map_val_34_to_20(H12[1][0]);

  940.             map_val_34_to_20(H21[0][0]);

  941.             map_val_34_to_20(H21[1][0]);

  942.             map_val_34_to_20(H22[0][0]);

  943.             map_val_34_to_20(H22[1][0]);

  944.             ipdopd_reset(ipd_hist, opd_hist);

  945.         }

  946.     }

  947. 

  948.     //Mixing

  949.     for (e = 0; e < ps->num_env; e++) {

  950.         for (b = 0; b < NR_PAR_BANDS[is34]; b++) {

  951.             float h11, h12, h21, h22;

  952.             h11 = H_LUT[iid_mapped[e][b] + 7 + 23 * ps->iid_quant][icc_mapped[e][b]][0];

  953.             h12 = H_LUT[iid_mapped[e][b] + 7 + 23 * ps->iid_quant][icc_mapped[e][b]][1];

  954.             h21 = H_LUT[iid_mapped[e][b] + 7 + 23 * ps->iid_quant][icc_mapped[e][b]][2];

  955.             h22 = H_LUT[iid_mapped[e][b] + 7 + 23 * ps->iid_quant][icc_mapped[e][b]][3];

  956.             if (!PS_BASELINE && ps->enable_ipdopd && b < ps->nr_ipdopd_par) {

  957.                 //The spec say says to only run this smoother when enable_ipdopd

  958.                 //is set but the reference decoder appears to run it constantly

  959.                 float h11i, h12i, h21i, h22i;

  960.                 float ipd_adj_re, ipd_adj_im;

  961.                 int opd_idx = opd_hist[b] * 8 + opd_mapped[e][b];

  962.                 int ipd_idx = ipd_hist[b] * 8 + ipd_mapped[e][b];

  963.                 float opd_re = pd_re_smooth[opd_idx];

  964.                 float opd_im = pd_im_smooth[opd_idx];

  965.                 float ipd_re = pd_re_smooth[ipd_idx];

  966.                 float ipd_im = pd_im_smooth[ipd_idx];

  967.                 opd_hist[b] = opd_idx & 0x3F;

  968.                 ipd_hist[b] = ipd_idx & 0x3F;

  969. 

  970.                 ipd_adj_re = opd_re*ipd_re + opd_im*ipd_im;

  971.                 ipd_adj_im = opd_im*ipd_re - opd_re*ipd_im;

  972.                 h11i = h11 * opd_im;

  973.                 h11  = h11 * opd_re;

  974.                 h12i = h12 * ipd_adj_im;

  975.                 h12  = h12 * ipd_adj_re;

  976.                 h21i = h21 * opd_im;

  977.                 h21  = h21 * opd_re;

  978.                 h22i = h22 * ipd_adj_im;

  979.                 h22  = h22 * ipd_adj_re;

  980.                 H11[1][e+1][b] = h11i;

  981.                 H12[1][e+1][b] = h12i;

  982.                 H21[1][e+1][b] = h21i;

  983.                 H22[1][e+1][b] = h22i;

  984.             }

  985.             H11[0][e+1][b] = h11;

  986.             H12[0][e+1][b] = h12;

  987.             H21[0][e+1][b] = h21;

  988.             H22[0][e+1][b] = h22;

  989.         }

  990.         for (k = 0; k < NR_BANDS[is34]; k++) {

  991.             float h11r, h12r, h21r, h22r;

  992.             float h11i, h12i, h21i, h22i;

  993.             float h11r_step, h12r_step, h21r_step, h22r_step;

  994.             float h11i_step, h12i_step, h21i_step, h22i_step;

  995.             int start = ps->border_position[e];

  996.             int stop  = ps->border_position[e+1];

  997.             float width = 1.f / (stop - start);

  998.             b = k_to_i[k];

  999.             h11r = H11[0][e][b];

  1000.             h12r = H12[0][e][b];

  1001.             h21r = H21[0][e][b];

  1002.             h22r = H22[0][e][b];

  1003.             if (!PS_BASELINE && ps->enable_ipdopd) {

  1004.             //Is this necessary? ps_04_new seems unchanged

  1005.             if ((is34 && k <= 13 && k >= 9) || (!is34 && k <= 1)) {

  1006.                 h11i = -H11[1][e][b];

  1007.                 h12i = -H12[1][e][b];

  1008.                 h21i = -H21[1][e][b];

  1009.                 h22i = -H22[1][e][b];

  1010.             } else {

  1011.                 h11i = H11[1][e][b];

  1012.                 h12i = H12[1][e][b];

  1013.                 h21i = H21[1][e][b];

  1014.                 h22i = H22[1][e][b];

  1015.             }

  1016.             }

  1017.             //Interpolation

  1018.             h11r_step = (H11[0][e+1][b] - h11r) * width;

  1019.             h12r_step = (H12[0][e+1][b] - h12r) * width;

  1020.             h21r_step = (H21[0][e+1][b] - h21r) * width;

  1021.             h22r_step = (H22[0][e+1][b] - h22r) * width;

  1022.             if (!PS_BASELINE && ps->enable_ipdopd) {

  1023.                 h11i_step = (H11[1][e+1][b] - h11i) * width;

  1024.                 h12i_step = (H12[1][e+1][b] - h12i) * width;

  1025.                 h21i_step = (H21[1][e+1][b] - h21i) * width;

  1026.                 h22i_step = (H22[1][e+1][b] - h22i) * width;

  1027.             }

  1028.             for (n = start + 1; n <= stop; n++) {

  1029.                 //l is s, r is d

  1030.                 float l_re = l[k][n][0];

  1031.                 float l_im = l[k][n][1];

  1032.                 float r_re = r[k][n][0];

  1033.                 float r_im = r[k][n][1];

  1034.                 h11r += h11r_step;

  1035.                 h12r += h12r_step;

  1036.                 h21r += h21r_step;

  1037.                 h22r += h22r_step;

  1038.                 if (!PS_BASELINE && ps->enable_ipdopd) {

  1039.                 h11i += h11i_step;

  1040.                 h12i += h12i_step;

  1041.                 h21i += h21i_step;

  1042.                 h22i += h22i_step;

  1043. 

  1044.                 l[k][n][0] = h11r*l_re + h21r*r_re - h11i*l_im - h21i*r_im;

  1045.                 l[k][n][1] = h11r*l_im + h21r*r_im + h11i*l_re + h21i*r_re;

  1046.                 r[k][n][0] = h12r*l_re + h22r*r_re - h12i*l_im - h22i*r_im;

  1047.                 r[k][n][1] = h12r*l_im + h22r*r_im + h12i*l_re + h22i*r_re;

  1048.                 } else {

  1049.                 l[k][n][0] = h11r*l_re + h21r*r_re;

  1050.                 l[k][n][1] = h11r*l_im + h21r*r_im;

  1051.                 r[k][n][0] = h12r*l_re + h22r*r_re;

  1052.                 r[k][n][1] = h12r*l_im + h22r*r_im;

  1053.                 }

  1054.             }

  1055.         }

  1056.     }

  1057. }

  1058. 

  1059. int ff_ps_apply(AVCodecContext *avctx, PSContext *ps, float L[2][38][64], float R[2][38][64], int top)

  1060. {

  1061.     float Lbuf[91][32][2];

  1062.     float Rbuf[91][32][2];

  1063.     const int len = 32;

  1064.     int is34 = ps->is34bands;

  1065. 

  1066.     top += NR_BANDS[is34] - 64;

  1067.     memset(ps->delay+top, 0, (NR_BANDS[is34] - top)*sizeof(ps->delay[0]));

  1068.     if (top < NR_ALLPASS_BANDS[is34])

  1069.         memset(ps->ap_delay + top, 0, (NR_ALLPASS_BANDS[is34] - top)*sizeof(ps->ap_delay[0]));

  1070. 

  1071.     hybrid_analysis(Lbuf, ps->in_buf, L, is34, len);

  1072.     decorrelation(ps, Rbuf, Lbuf, is34);

  1073.     stereo_processing(ps, Lbuf, Rbuf, is34);

  1074.     hybrid_synthesis(L, Lbuf, is34, len);

  1075.     hybrid_synthesis(R, Rbuf, is34, len);

  1076. 

  1077.     return 0;

  1078. }

  1079. 

  1080. #define PS_INIT_VLC_STATIC(num, size) \

  1081.     INIT_VLC_STATIC(&vlc_ps[num], 9, ps_tmp[num].table_size / ps_tmp[num].elem_size,    \

  1082.                     ps_tmp[num].ps_bits, 1, 1,                                          \

  1083.                     ps_tmp[num].ps_codes, ps_tmp[num].elem_size, ps_tmp[num].elem_size, \

  1084.                     size);

  1085. 

  1086. #define PS_VLC_ROW(name) \

  1087.     { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }

  1088. 

  1089. av_cold void ff_ps_init(void) {

  1090.     // Syntax initialization

  1091.     static const struct {

  1092.         const void *ps_codes, *ps_bits;

  1093.         const unsigned int table_size, elem_size;

  1094.     } ps_tmp[] = {

  1095.         PS_VLC_ROW(huff_iid_df1),

  1096.         PS_VLC_ROW(huff_iid_dt1),

  1097.         PS_VLC_ROW(huff_iid_df0),

  1098.         PS_VLC_ROW(huff_iid_dt0),

  1099.         PS_VLC_ROW(huff_icc_df),

  1100.         PS_VLC_ROW(huff_icc_dt),

  1101.         PS_VLC_ROW(huff_ipd_df),

  1102.         PS_VLC_ROW(huff_ipd_dt),

  1103.         PS_VLC_ROW(huff_opd_df),

  1104.         PS_VLC_ROW(huff_opd_dt),

  1105.     };

  1106. 

  1107.     PS_INIT_VLC_STATIC(0, 1544);

  1108.     PS_INIT_VLC_STATIC(1,  832);

  1109.     PS_INIT_VLC_STATIC(2, 1024);

  1110.     PS_INIT_VLC_STATIC(3, 1036);

  1111.     PS_INIT_VLC_STATIC(4,  544);

  1112.     PS_INIT_VLC_STATIC(5,  544);

  1113.     PS_INIT_VLC_STATIC(6,  512);

  1114.     PS_INIT_VLC_STATIC(7,  512);

  1115.     PS_INIT_VLC_STATIC(8,  512);

  1116.     PS_INIT_VLC_STATIC(9,  512);

  1117. 

  1118.     ps_tableinit();

  1119. }

  1120. 

  1121. av_cold void ff_ps_ctx_init(PSContext *ps)

  1122. {

  1123.     ipdopd_reset(ps->ipd_hist, ps->opd_hist);

  1124. }