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FFmpeg/libavcodec/ps.c

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  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  //< Operate in Baseline PS mode

  31.                        //< Baseline implies 10 or 20 stereo bands,

  32.                        //< mixing mode A, and no ipd/opd

  33. 

  34. #define numQMFSlots 32 //numTimeSlots * RATE

  35. 

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

  37.     { 0, 1, 2, 4, },

  38.     { 1, 2, 3, 4, },

  39. };

  40. 

  41. static const int8_t nr_iidicc_par_tab[] = {

  42.     10, 20, 34, 10, 20, 34,

  43. };

  44. 

  45. static const int8_t nr_iidopd_par_tab[] = {

  46.      5, 11, 17,  5, 11, 17,

  47. };

  48. 

  49. enum {

  50.     huff_iid_df1,

  51.     huff_iid_dt1,

  52.     huff_iid_df0,

  53.     huff_iid_dt0,

  54.     huff_icc_df,

  55.     huff_icc_dt,

  56.     huff_ipd_df,

  57.     huff_ipd_dt,

  58.     huff_opd_df,

  59.     huff_opd_dt,

  60. };

  61. 

  62. static const int huff_iid[] = {

  63.     huff_iid_df0,

  64.     huff_iid_df1,

  65.     huff_iid_dt0,

  66.     huff_iid_dt1,

  67. };

  68. 

  69. static VLC vlc_ps[10];

  70. 

  71. /**

  72.  * Read Inter-channel Intensity Difference/Inter-Channel Coherence/

  73.  * Inter-channel Phase Difference/Overall Phase Difference parameters from the

  74.  * bitstream.

  75.  *

  76.  * @param avctx contains the current codec context

  77.  * @param gb    pointer to the input bitstream

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

  79.  * @param par   pointer to the parameter to be read

  80.  * @param e     envelope to decode

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

  82.  */

  83. #define READ_PAR_DATA(PAR, OFFSET, MASK, ERR_CONDITION) \

  84. static int read_ ## PAR ## _data(AVCodecContext *avctx, GetBitContext *gb, PSContext *ps, \

  85.                         int8_t (*PAR)[PS_MAX_NR_IIDICC], int table_idx, int e, int dt) \

  86. { \

  87.     int b, num = ps->nr_ ## PAR ## _par; \

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

  89.     if (dt) { \

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

  91.         e_prev = FFMAX(e_prev, 0); \

  92.         for (b = 0; b < num; b++) { \

  93.             int val = PAR[e_prev][b] + get_vlc2(gb, vlc_table, 9, 3) - OFFSET; \

  94.             if (MASK) val &= MASK; \

  95.             PAR[e][b] = val; \

  96.             if (ERR_CONDITION) \

  97.                 goto err; \

  98.         } \

  99.     } else { \

  100.         int val = 0; \

  101.         for (b = 0; b < num; b++) { \

  102.             val += get_vlc2(gb, vlc_table, 9, 3) - OFFSET; \

  103.             if (MASK) val &= MASK; \

  104.             PAR[e][b] = val; \

  105.             if (ERR_CONDITION) \

  106.                 goto err; \

  107.         } \

  108.     } \

  109.     return 0; \

  110. err: \

  111.     av_log(avctx, AV_LOG_ERROR, "illegal "#PAR"\n"); \

  112.     return -1; \

  113. }

  114. 

  115. READ_PAR_DATA(iid,    huff_offset[table_idx],    0, FFABS(ps->iid_par[e][b]) > 7 + 8 * ps->iid_quant)

  116. READ_PAR_DATA(icc,    huff_offset[table_idx],    0, ps->icc_par[e][b] > 7U)

  117. READ_PAR_DATA(ipdopd,                      0, 0x07, 0)

  118. 

  119. static int ps_read_extension_data(GetBitContext *gb, PSContext *ps, int ps_extension_id)

  120. {

  121.     int e;

  122.     int count = get_bits_count(gb);

  123. 

  124.     if (ps_extension_id)

  125.         return 0;

  126. 

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

  128.     if (ps->enable_ipdopd) {

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

  130.             int dt = get_bits1(gb);

  131.             read_ipdopd_data(NULL, gb, ps, ps->ipd_par, dt ? huff_ipd_dt : huff_ipd_df, e, dt);

  132.             dt = get_bits1(gb);

  133.             read_ipdopd_data(NULL, gb, ps, ps->opd_par, dt ? huff_opd_dt : huff_opd_df, e, dt);

  134.         }

  135.     }

  136.     skip_bits1(gb);      //reserved_ps

  137.     return get_bits_count(gb) - count;

  138. }

  139. 

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

  141. {

  142.     int i;

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

  144.         opd_hist[i] = 0;

  145.         ipd_hist[i] = 0;

  146.     }

  147. }

  148. 

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

  150. {

  151.     int e;

  152.     int bit_count_start = get_bits_count(gb_host);

  153.     int header;

  154.     int bits_consumed;

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

  156. 

  157.     header = get_bits1(gb);

  158.     if (header) {     //enable_ps_header

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

  160.         if (ps->enable_iid) {

  161.             int iid_mode = get_bits(gb, 3);

  162.             if (iid_mode > 5) {

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

  164.                        iid_mode);

  165.                 goto err;

  166.             }

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

  168.             ps->iid_quant     = iid_mode > 2;

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

  170.         }

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

  172.         if (ps->enable_icc) {

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

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

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

  176.                        ps->icc_mode);

  177.                 goto err;

  178.             }

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

  180.         }

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

  182.     }

  183. 

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

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

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

  187. 

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

  189.     if (ps->frame_class) {

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

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

  192.     } else

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

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

  195. 

  196.     if (ps->enable_iid) {

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

  198.             int dt = get_bits1(gb);

  199.             if (read_iid_data(avctx, gb, ps, ps->iid_par, huff_iid[2*dt+ps->iid_quant], e, dt))

  200.                 goto err;

  201.         }

  202.     } else

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

  204. 

  205.     if (ps->enable_icc)

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

  207.             int dt = get_bits1(gb);

  208.             if (read_icc_data(avctx, gb, ps, ps->icc_par, dt ? huff_icc_dt : huff_icc_df, e, dt))

  209.                 goto err;

  210.         }

  211.     else

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

  213. 

  214.     if (ps->enable_ext) {

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

  216.         if (cnt == 15) {

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

  218.         }

  219.         cnt *= 8;

  220.         while (cnt > 7) {

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

  222.             cnt -= 2 + ps_read_extension_data(gb, ps, ps_extension_id);

  223.         }

  224.         if (cnt < 0) {

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

  226.             goto err;

  227.         }

  228.         skip_bits(gb, cnt);

  229.     }

  230. 

  231.     ps->enable_ipdopd &= !PS_BASELINE;

  232. 

  233.     //Fix up envelopes

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

  235.         //Create a fake envelope

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

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

  238.             if (ps->enable_iid) {

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

  240.             }

  241.             if (ps->enable_icc) {

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

  243.             }

  244.             if (ps->enable_ipdopd) {

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

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

  247.             }

  248.         }

  249.         ps->num_env++;

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

  251.     }

  252. 

  253. 

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

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

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

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

  258. 

  259.     //Baseline

  260.     if (!ps->enable_ipdopd) {

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

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

  263.     }

  264. 

  265.     if (header)

  266.         ps->start = 1;

  267. 

  268.     bits_consumed = get_bits_count(gb) - bit_count_start;

  269.     if (bits_consumed <= bits_left) {

  270.         skip_bits_long(gb_host, bits_consumed);

  271.         return bits_consumed;

  272.     }

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

  274. err:

  275.     ps->start = 0;

  276.     skip_bits_long(gb_host, bits_left);

  277.     return bits_left;

  278. }

  279. 

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

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

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

  283. {

  284.     int i, j;

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

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

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

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

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

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

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

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

  293.         }

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

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

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

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

  298.     }

  299. }

  300. 

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

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

  303. {

  304.     int i, j, ssb;

  305.     int N = 8;

  306.     float temp[8][2];

  307. 

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

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

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

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

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

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

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

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

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

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

  318.             }

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

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

  321.         }

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

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

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

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

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

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

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

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

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

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

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

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

  334.     }

  335. }

  336. 

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

  338. {

  339.     int i, j, ssb;

  340. 

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

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

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

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

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

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

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

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

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

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

  351.             }

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

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

  354.         }

  355.     }

  356. }

  357. 

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

  359. {

  360.     int i, j;

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

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

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

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

  365.         }

  366.     }

  367.     if(is34) {

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

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

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

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

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

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

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

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

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

  377.             }

  378.         }

  379.     } else {

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

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

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

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

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

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

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

  387.             }

  388.         }

  389.     }

  390.     //update in_buf

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

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

  393.     }

  394. }

  395. 

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

  397. {

  398.     int i, n;

  399.     if(is34) {

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

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

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

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

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

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

  406.             }

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

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

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

  410.             }

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

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

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

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

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

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

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

  418.             }

  419.         }

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

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

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

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

  424.             }

  425.         }

  426.     } else {

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

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

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

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

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

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

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

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

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

  436.         }

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

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

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

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

  441.             }

  442.         }

  443.     }

  444. }

  445. 

  446. /// All-pass filter decay slope

  447. #define DECAY_SLOPE      0.05f

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

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

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

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

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

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

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

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

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

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

  458. 

  459. /** Table 8.46 */

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

  461. {

  462.     int b;

  463.     if (full)

  464.         b = 9;

  465.     else {

  466.         b = 4;

  467.         par_mapped[10] = 0;

  468.     }

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

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

  471.     }

  472. }

  473. 

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

  475. {

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

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

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

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

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

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

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

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

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

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

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

  487.     if (full) {

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

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

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

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

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

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

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

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

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

  497.     }

  498. }

  499. 

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

  501. {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  522. }

  523. 

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

  525. {

  526.     if (full) {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  545.     } else {

  546.         par_mapped[16] =      0;

  547.     }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  564. }

  565. 

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

  567. {

  568.     if (full) {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  586.     }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  604. }

  605. 

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

  607. {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  641.     par[ 0] =  par[ 0];

  642. }

  643. 

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

  645. {

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

  647.     float transient_gain[34][PS_QMF_TIME_SLOTS];

  648.     float *peak_decay_nrg = ps->peak_decay_nrg;

  649.     float *power_smooth = ps->power_smooth;

  650.     float *peak_decay_diff_smooth = ps->peak_decay_diff_smooth;

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

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

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

  654.     const float peak_decay_factor = 0.76592833836465f;

  655.     const float transient_impact  = 1.5f;

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

  657.     int i, k, m, n;

  658.     int n0 = 0, nL = 32;

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

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

  661.                                0.56471812200776f,

  662.                                0.48954165955695f };

  663. 

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

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

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

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

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

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

  670.     }

  671. 

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

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

  674.             int i = k_to_i[k];

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

  676.         }

  677.     }

  678. 

  679.     //Transient detection

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

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

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

  683.             float denom;

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

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

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

  687.             denom = transient_impact * peak_decay_diff_smooth[i];

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

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

  690.         }

  691.     }

  692. 

  693.     //Decorrelation and transient reduction

  694.     //                         PS_AP_LINKS - 1

  695.     //                               -----

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

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

  698.     //                                | | 1 - a[m]*g_decay_slope[k]*Q_fract_allpass[k][m]*z^-link_delay[m]

  699.     //                               m = 0

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

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

  702.         int b = k_to_i[k];

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

  704.         float ag[PS_AP_LINKS];

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

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

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

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

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

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

  711.         }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  730.             }

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

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

  733.         }

  734.     }

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

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

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

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

  739.             //H = delay 14

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

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

  742.         }

  743.     }

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

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

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

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

  748.             //H = delay 1

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

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

  751.         }

  752.     }

  753. }

  754. 

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

  756.                     int8_t           (*par)[PS_MAX_NR_IIDICC],

  757.                     int num_par, int num_env, int full)

  758. {

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

  760.     int e;

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

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

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

  764.         }

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

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

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

  768.         }

  769.     } else {

  770.         *p_par_mapped = par;

  771.     }

  772. }

  773. 

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

  775.                     int8_t           (*par)[PS_MAX_NR_IIDICC],

  776.                     int num_par, int num_env, int full)

  777. {

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

  779.     int e;

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

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

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

  783.         }

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

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

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

  787.         }

  788.     } else {

  789.         *p_par_mapped = par;

  790.     }

  791. }

  792. 

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

  794. {

  795.     int e, b, k, n;

  796. 

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

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

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

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

  801.     int8_t *opd_hist = ps->opd_hist;

  802.     int8_t *ipd_hist = ps->ipd_hist;

  803.     int8_t iid_mapped_buf[PS_MAX_NUM_ENV][PS_MAX_NR_IIDICC];

  804.     int8_t icc_mapped_buf[PS_MAX_NUM_ENV][PS_MAX_NR_IIDICC];

  805.     int8_t ipd_mapped_buf[PS_MAX_NUM_ENV][PS_MAX_NR_IIDICC];

  806.     int8_t opd_mapped_buf[PS_MAX_NUM_ENV][PS_MAX_NR_IIDICC];

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

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

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

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

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

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

  813. 

  814.     //Remapping

  815.     memcpy(H11[0][0], H11[0][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H11[0][0][0]));

  816.     memcpy(H11[1][0], H11[1][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H11[1][0][0]));

  817.     memcpy(H12[0][0], H12[0][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H12[0][0][0]));

  818.     memcpy(H12[1][0], H12[1][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H12[1][0][0]));

  819.     memcpy(H21[0][0], H21[0][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H21[0][0][0]));

  820.     memcpy(H21[1][0], H21[1][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H21[1][0][0]));

  821.     memcpy(H22[0][0], H22[0][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H22[0][0][0]));

  822.     memcpy(H22[1][0], H22[1][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H22[1][0][0]));

  823.     if (is34) {

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

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

  826.         if (ps->enable_ipdopd) {

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

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

  829.         }

  830.         if (!ps->is34bands_old) {

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

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

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

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

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

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

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

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

  839.             ipdopd_reset(ipd_hist, opd_hist);

  840.         }

  841.     } else {

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

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

  844.         if (ps->enable_ipdopd) {

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

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

  847.         }

  848.         if (ps->is34bands_old) {

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

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

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

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

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

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

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

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

  857.             ipdopd_reset(ipd_hist, opd_hist);

  858.         }

  859.     }

  860. 

  861.     //Mixing

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

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

  864.             float h11, h12, h21, h22;

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

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

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

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

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

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

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

  872.                 float h11i, h12i, h21i, h22i;

  873.                 float ipd_adj_re, ipd_adj_im;

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

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

  876.                 float opd_re = pd_re_smooth[opd_idx];

  877.                 float opd_im = pd_im_smooth[opd_idx];

  878.                 float ipd_re = pd_re_smooth[ipd_idx];

  879.                 float ipd_im = pd_im_smooth[ipd_idx];

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

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

  882. 

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

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

  885.                 h11i = h11 * opd_im;

  886.                 h11  = h11 * opd_re;

  887.                 h12i = h12 * ipd_adj_im;

  888.                 h12  = h12 * ipd_adj_re;

  889.                 h21i = h21 * opd_im;

  890.                 h21  = h21 * opd_re;

  891.                 h22i = h22 * ipd_adj_im;

  892.                 h22  = h22 * ipd_adj_re;

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

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

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

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

  897.             }

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

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

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

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

  902.         }

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

  904.             float h11r, h12r, h21r, h22r;

  905.             float h11i, h12i, h21i, h22i;

  906.             float h11r_step, h12r_step, h21r_step, h22r_step;

  907.             float h11i_step, h12i_step, h21i_step, h22i_step;

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

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

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

  911.             b = k_to_i[k];

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

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

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

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

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

  917.             //Is this necessary? ps_04_new seems unchanged

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

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

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

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

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

  923.             } else {

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

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

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

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

  928.             }

  929.             }

  930.             //Interpolation

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

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

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

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

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

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

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

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

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

  940.             }

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

  942.                 //l is s, r is d

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

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

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

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

  947.                 h11r += h11r_step;

  948.                 h12r += h12r_step;

  949.                 h21r += h21r_step;

  950.                 h22r += h22r_step;

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

  952.                     h11i += h11i_step;

  953.                     h12i += h12i_step;

  954.                     h21i += h21i_step;

  955.                     h22i += h22i_step;

  956. 

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

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

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

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

  961.                 } else {

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

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

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

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

  966.                 }

  967.             }

  968.         }

  969.     }

  970. }

  971. 

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

  973. {

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

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

  976.     const int len = 32;

  977.     int is34 = ps->is34bands;

  978. 

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

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

  981.     if (top < NR_ALLPASS_BANDS[is34])

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

  983. 

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

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

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

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

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

  989. 

  990.     return 0;

  991. }

  992. 

  993. #define PS_INIT_VLC_STATIC(num, size) \

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

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

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

  997.                     size);

  998. 

  999. #define PS_VLC_ROW(name) \

  1000.     { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }

  1001. 

  1002. av_cold void ff_ps_init(void) {

  1003.     // Syntax initialization

  1004.     static const struct {

  1005.         const void *ps_codes, *ps_bits;

  1006.         const unsigned int table_size, elem_size;

  1007.     } ps_tmp[] = {

  1008.         PS_VLC_ROW(huff_iid_df1),

  1009.         PS_VLC_ROW(huff_iid_dt1),

  1010.         PS_VLC_ROW(huff_iid_df0),

  1011.         PS_VLC_ROW(huff_iid_dt0),

  1012.         PS_VLC_ROW(huff_icc_df),

  1013.         PS_VLC_ROW(huff_icc_dt),

  1014.         PS_VLC_ROW(huff_ipd_df),

  1015.         PS_VLC_ROW(huff_ipd_dt),

  1016.         PS_VLC_ROW(huff_opd_df),

  1017.         PS_VLC_ROW(huff_opd_dt),

  1018.     };

  1019. 

  1020.     PS_INIT_VLC_STATIC(0, 1544);

  1021.     PS_INIT_VLC_STATIC(1,  832);

  1022.     PS_INIT_VLC_STATIC(2, 1024);

  1023.     PS_INIT_VLC_STATIC(3, 1036);

  1024.     PS_INIT_VLC_STATIC(4,  544);

  1025.     PS_INIT_VLC_STATIC(5,  544);

  1026.     PS_INIT_VLC_STATIC(6,  512);

  1027.     PS_INIT_VLC_STATIC(7,  512);

  1028.     PS_INIT_VLC_STATIC(8,  512);

  1029.     PS_INIT_VLC_STATIC(9,  512);

  1030. 

  1031.     ps_tableinit();

  1032. }

  1033. 

  1034. av_cold void ff_ps_ctx_init(PSContext *ps)

  1035. {

  1036.     ipdopd_reset(ps->ipd_hist, ps->opd_hist);

  1037. }