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FFmpeg/libavcodec/aacps.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/common.h"

  24. #include "libavutil/mathematics.h"

  25. #include "avcodec.h"

  26. #include "get_bits.h"

  27. #include "aacps.h"

  28. #include "aacps_tablegen.h"

  29. #include "aacpsdata.c"

  30. 

  31. #define PS_BASELINE 0  ///< Operate in Baseline PS mode

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

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

  34. 

  35. #define numQMFSlots 32 //numTimeSlots * RATE

  36. 

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

  38.     { 0, 1, 2, 4, },

  39.     { 1, 2, 3, 4, },

  40. };

  41. 

  42. static const int8_t nr_iidicc_par_tab[] = {

  43.     10, 20, 34, 10, 20, 34,

  44. };

  45. 

  46. static const int8_t nr_iidopd_par_tab[] = {

  47.      5, 11, 17,  5, 11, 17,

  48. };

  49. 

  50. enum {

  51.     huff_iid_df1,

  52.     huff_iid_dt1,

  53.     huff_iid_df0,

  54.     huff_iid_dt0,

  55.     huff_icc_df,

  56.     huff_icc_dt,

  57.     huff_ipd_df,

  58.     huff_ipd_dt,

  59.     huff_opd_df,

  60.     huff_opd_dt,

  61. };

  62. 

  63. static const int huff_iid[] = {

  64.     huff_iid_df0,

  65.     huff_iid_df1,

  66.     huff_iid_dt0,

  67.     huff_iid_dt1,

  68. };

  69. 

  70. static VLC vlc_ps[10];

  71. 

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

  73. /** \

  74.  * Read Inter-channel Intensity Difference/Inter-Channel Coherence/ \

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

  76.  * bitstream. \

  77.  * \

  78.  * @param avctx contains the current codec context \

  79.  * @param gb    pointer to the input bitstream \

  80.  * @param ps    pointer to the Parametric Stereo context \

  81.  * @param PAR   pointer to the parameter to be read \

  82.  * @param e     envelope to decode \

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

  84.  */ \

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

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

  87. { \

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

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

  90.     if (dt) { \

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

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

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

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

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

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

  97.             if (ERR_CONDITION) \

  98.                 goto err; \

  99.         } \

  100.     } else { \

  101.         int val = 0; \

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

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

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

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

  106.             if (ERR_CONDITION) \

  107.                 goto err; \

  108.         } \

  109.     } \

  110.     return 0; \

  111. err: \

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

  113.     return -1; \

  114. }

  115. 

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

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

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

  119. 

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

  121. {

  122.     int e;

  123.     int count = get_bits_count(gb);

  124. 

  125.     if (ps_extension_id)

  126.         return 0;

  127. 

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

  129.     if (ps->enable_ipdopd) {

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

  131.             int dt = get_bits1(gb);

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

  133.             dt = get_bits1(gb);

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

  135.         }

  136.     }

  137.     skip_bits1(gb);      //reserved_ps

  138.     return get_bits_count(gb) - count;

  139. }

  140. 

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

  142. {

  143.     int i;

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

  145.         opd_hist[i] = 0;

  146.         ipd_hist[i] = 0;

  147.     }

  148. }

  149. 

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

  151. {

  152.     int e;

  153.     int bit_count_start = get_bits_count(gb_host);

  154.     int header;

  155.     int bits_consumed;

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

  157. 

  158.     header = get_bits1(gb);

  159.     if (header) {     //enable_ps_header

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

  161.         if (ps->enable_iid) {

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

  163.             if (iid_mode > 5) {

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

  165.                        iid_mode);

  166.                 goto err;

  167.             }

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

  169.             ps->iid_quant     = iid_mode > 2;

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

  171.         }

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

  173.         if (ps->enable_icc) {

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

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

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

  177.                        ps->icc_mode);

  178.                 goto err;

  179.             }

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

  181.         }

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

  183.     }

  184. 

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

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

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

  188. 

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

  190.     if (ps->frame_class) {

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

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

  193.     } else

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

  195.             ps->border_position[e] = (e * numQMFSlots >> ff_log2_tab[ps->num_env]) - 1;

  196. 

  197.     if (ps->enable_iid) {

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

  199.             int dt = get_bits1(gb);

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

  201.                 goto err;

  202.         }

  203.     } else

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

  205. 

  206.     if (ps->enable_icc)

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

  208.             int dt = get_bits1(gb);

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

  210.                 goto err;

  211.         }

  212.     else

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

  214. 

  215.     if (ps->enable_ext) {

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

  217.         if (cnt == 15) {

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

  219.         }

  220.         cnt *= 8;

  221.         while (cnt > 7) {

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

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

  224.         }

  225.         if (cnt < 0) {

  226.             av_log(avctx, AV_LOG_ERROR, "ps extension overflow %d\n", cnt);

  227.             goto err;

  228.         }

  229.         skip_bits(gb, cnt);

  230.     }

  231. 

  232.     ps->enable_ipdopd &= !PS_BASELINE;

  233. 

  234.     //Fix up envelopes

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

  236.         //Create a fake envelope

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

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

  239.             if (ps->enable_iid) {

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

  241.             }

  242.             if (ps->enable_icc) {

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

  244.             }

  245.             if (ps->enable_ipdopd) {

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

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

  248.             }

  249.         }

  250.         ps->num_env++;

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

  252.     }

  253. 

  254. 

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

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

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

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

  259. 

  260.     //Baseline

  261.     if (!ps->enable_ipdopd) {

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

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

  264.     }

  265. 

  266.     if (header)

  267.         ps->start = 1;

  268. 

  269.     bits_consumed = get_bits_count(gb) - bit_count_start;

  270.     if (bits_consumed <= bits_left) {

  271.         skip_bits_long(gb_host, bits_consumed);

  272.         return bits_consumed;

  273.     }

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

  275. err:

  276.     ps->start = 0;

  277.     skip_bits_long(gb_host, bits_left);

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

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

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

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

  282.     return bits_left;

  283. }

  284. 

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

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

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

  288. {

  289.     int i, j;

  290.     for (i = 0; i < len; i++, in++) {

  291.         float re_in = filter[6] * in[6][0];          //real inphase

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

  293.         float im_in = filter[6] * in[6][1];          //imag inphase

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

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

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

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

  298.         }

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

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

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

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

  303.     }

  304. }

  305. 

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

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

  308. {

  309.     int i, j, ssb;

  310.     int N = 8;

  311.     float temp[8][2];

  312. 

  313.     for (i = 0; i < len; i++, in++) {

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

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

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

  317.                 float in0_re = in[j][0];

  318.                 float in0_im = in[j][1];

  319.                 float in1_re = in[12-j][0];

  320.                 float in1_im = in[12-j][1];

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

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

  323.             }

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

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

  326.         }

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

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

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

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

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

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

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

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

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

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

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

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

  339.     }

  340. }

  341. 

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

  343. {

  344.     int i, j, ssb;

  345. 

  346.     for (i = 0; i < len; i++, in++) {

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

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

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

  350.                 float in0_re = in[j][0];

  351.                 float in0_im = in[j][1];

  352.                 float in1_re = in[12-j][0];

  353.                 float in1_im = in[12-j][1];

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

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

  356.             }

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

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

  359.         }

  360.     }

  361. }

  362. 

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

  364. {

  365.     int i, j;

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

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

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

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

  370.         }

  371.     }

  372.     if (is34) {

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

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

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

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

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

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

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

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

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

  382.             }

  383.         }

  384.     } else {

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

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

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

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

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

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

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

  392.             }

  393.         }

  394.     }

  395.     //update in_buf

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

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

  398.     }

  399. }

  400. 

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

  402. {

  403.     int i, n;

  404.     if (is34) {

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

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

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

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

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

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

  411.             }

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

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

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

  415.             }

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

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

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

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

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

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

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

  423.             }

  424.         }

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

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

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

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

  429.             }

  430.         }

  431.     } else {

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

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

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

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

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

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

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

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

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

  441.         }

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

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

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

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

  446.             }

  447.         }

  448.     }

  449. }

  450. 

  451. /// All-pass filter decay slope

  452. #define DECAY_SLOPE      0.05f

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

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

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

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

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

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

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

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

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

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

  463. 

  464. /** Table 8.46 */

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

  466. {

  467.     int b;

  468.     if (full)

  469.         b = 9;

  470.     else {

  471.         b = 4;

  472.         par_mapped[10] = 0;

  473.     }

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

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

  476.     }

  477. }

  478. 

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

  480. {

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

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

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

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

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

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

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

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

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

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

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

  492.     if (full) {

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

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

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

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

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

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

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

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

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

  502.     }

  503. }

  504. 

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

  506. {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  527. }

  528. 

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

  530. {

  531.     if (full) {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  550.     } else {

  551.         par_mapped[16] =      0;

  552.     }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  569. }

  570. 

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

  572. {

  573.     if (full) {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  591.     }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  609. }

  610. 

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

  612. {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  647. }

  648. 

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

  650. {

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

  652.     float transient_gain[34][PS_QMF_TIME_SLOTS];

  653.     float *peak_decay_nrg = ps->peak_decay_nrg;

  654.     float *power_smooth = ps->power_smooth;

  655.     float *peak_decay_diff_smooth = ps->peak_decay_diff_smooth;

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

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

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

  659.     const float peak_decay_factor = 0.76592833836465f;

  660.     const float transient_impact  = 1.5f;

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

  662.     int i, k, m, n;

  663.     int n0 = 0, nL = 32;

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

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

  666.                                0.56471812200776f,

  667.                                0.48954165955695f };

  668. 

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

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

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

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

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

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

  675.     }

  676. 

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

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

  679.             int i = k_to_i[k];

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

  681.         }

  682.     }

  683. 

  684.     //Transient detection

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

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

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

  688.             float denom;

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

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

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

  692.             denom = transient_impact * peak_decay_diff_smooth[i];

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

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

  695.         }

  696.     }

  697. 

  698.     //Decorrelation and transient reduction

  699.     //                         PS_AP_LINKS - 1

  700.     //                               -----

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

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

  703.     //                                | | 1 - a[m]*g_decay_slope[k]*Q_fract_allpass[k][m]*z^-link_delay[m]

  704.     //                               m = 0

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

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

  707.         int b = k_to_i[k];

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

  709.         float ag[PS_AP_LINKS];

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

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

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

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

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

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

  716.         }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  735.             }

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

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

  738.         }

  739.     }

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

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

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

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

  744.             //H = delay 14

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

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

  747.         }

  748.     }

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

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

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

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

  753.             //H = delay 1

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

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

  756.         }

  757.     }

  758. }

  759. 

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

  761.                     int8_t           (*par)[PS_MAX_NR_IIDICC],

  762.                     int num_par, int num_env, int full)

  763. {

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

  765.     int e;

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

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

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

  769.         }

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

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

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

  773.         }

  774.     } else {

  775.         *p_par_mapped = par;

  776.     }

  777. }

  778. 

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

  780.                     int8_t           (*par)[PS_MAX_NR_IIDICC],

  781.                     int num_par, int num_env, int full)

  782. {

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

  784.     int e;

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

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

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

  788.         }

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

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

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

  792.         }

  793.     } else {

  794.         *p_par_mapped = par;

  795.     }

  796. }

  797. 

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

  799. {

  800.     int e, b, k, n;

  801. 

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

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

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

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

  806.     int8_t *opd_hist = ps->opd_hist;

  807.     int8_t *ipd_hist = ps->ipd_hist;

  808.     int8_t iid_mapped_buf[PS_MAX_NUM_ENV][PS_MAX_NR_IIDICC];

  809.     int8_t icc_mapped_buf[PS_MAX_NUM_ENV][PS_MAX_NR_IIDICC];

  810.     int8_t ipd_mapped_buf[PS_MAX_NUM_ENV][PS_MAX_NR_IIDICC];

  811.     int8_t opd_mapped_buf[PS_MAX_NUM_ENV][PS_MAX_NR_IIDICC];

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

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

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

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

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

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

  818. 

  819.     //Remapping

  820.     if (ps->num_env_old) {

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

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

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

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

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

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

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

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

  829.     }

  830. 

  831.     if (is34) {

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

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

  834.         if (ps->enable_ipdopd) {

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

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

  837.         }

  838.         if (!ps->is34bands_old) {

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

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

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

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

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

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

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

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

  847.             ipdopd_reset(ipd_hist, opd_hist);

  848.         }

  849.     } else {

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

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

  852.         if (ps->enable_ipdopd) {

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

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

  855.         }

  856.         if (ps->is34bands_old) {

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

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

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

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

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

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

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

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

  865.             ipdopd_reset(ipd_hist, opd_hist);

  866.         }

  867.     }

  868. 

  869.     //Mixing

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

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

  872.             float h11, h12, h21, h22;

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

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

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

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

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

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

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

  880.                 float h11i, h12i, h21i, h22i;

  881.                 float ipd_adj_re, ipd_adj_im;

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

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

  884.                 float opd_re = pd_re_smooth[opd_idx];

  885.                 float opd_im = pd_im_smooth[opd_idx];

  886.                 float ipd_re = pd_re_smooth[ipd_idx];

  887.                 float ipd_im = pd_im_smooth[ipd_idx];

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

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

  890. 

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

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

  893.                 h11i = h11 * opd_im;

  894.                 h11  = h11 * opd_re;

  895.                 h12i = h12 * ipd_adj_im;

  896.                 h12  = h12 * ipd_adj_re;

  897.                 h21i = h21 * opd_im;

  898.                 h21  = h21 * opd_re;

  899.                 h22i = h22 * ipd_adj_im;

  900.                 h22  = h22 * ipd_adj_re;

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

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

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

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

  905.             }

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

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

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

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

  910.         }

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

  912.             float h11r, h12r, h21r, h22r;

  913.             float h11i, h12i, h21i, h22i;

  914.             float h11r_step, h12r_step, h21r_step, h22r_step;

  915.             float h11i_step, h12i_step, h21i_step, h22i_step;

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

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

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

  919.             b = k_to_i[k];

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

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

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

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

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

  925.             //Is this necessary? ps_04_new seems unchanged

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

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

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

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

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

  931.             } else {

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

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

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

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

  936.             }

  937.             }

  938.             //Interpolation

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

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

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

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

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

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

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

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

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

  948.             }

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

  950.                 //l is s, r is d

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

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

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

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

  955.                 h11r += h11r_step;

  956.                 h12r += h12r_step;

  957.                 h21r += h21r_step;

  958.                 h22r += h22r_step;

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

  960.                     h11i += h11i_step;

  961.                     h12i += h12i_step;

  962.                     h21i += h21i_step;

  963.                     h22i += h22i_step;

  964. 

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

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

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

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

  969.                 } else {

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

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

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

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

  974.                 }

  975.             }

  976.         }

  977.     }

  978. }

  979. 

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

  981. {

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

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

  984.     const int len = 32;

  985.     int is34 = ps->is34bands;

  986. 

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

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

  989.     if (top < NR_ALLPASS_BANDS[is34])

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

  991. 

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

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

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

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

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

  997. 

  998.     return 0;

  999. }

  1000. 

  1001. #define PS_INIT_VLC_STATIC(num, size) \

  1002.     INIT_VLC_STATIC(&vlc_ps[num], 9, ps_tmp[num].table_size / ps_tmp[num].elem_size,    \

  1003.                     ps_tmp[num].ps_bits, 1, 1,                                          \

  1004.                     ps_tmp[num].ps_codes, ps_tmp[num].elem_size, ps_tmp[num].elem_size, \

  1005.                     size);

  1006. 

  1007. #define PS_VLC_ROW(name) \

  1008.     { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }

  1009. 

  1010. av_cold void ff_ps_init(void) {

  1011.     // Syntax initialization

  1012.     static const struct {

  1013.         const void *ps_codes, *ps_bits;

  1014.         const unsigned int table_size, elem_size;

  1015.     } ps_tmp[] = {

  1016.         PS_VLC_ROW(huff_iid_df1),

  1017.         PS_VLC_ROW(huff_iid_dt1),

  1018.         PS_VLC_ROW(huff_iid_df0),

  1019.         PS_VLC_ROW(huff_iid_dt0),

  1020.         PS_VLC_ROW(huff_icc_df),

  1021.         PS_VLC_ROW(huff_icc_dt),

  1022.         PS_VLC_ROW(huff_ipd_df),

  1023.         PS_VLC_ROW(huff_ipd_dt),

  1024.         PS_VLC_ROW(huff_opd_df),

  1025.         PS_VLC_ROW(huff_opd_dt),

  1026.     };

  1027. 

  1028.     PS_INIT_VLC_STATIC(0, 1544);

  1029.     PS_INIT_VLC_STATIC(1,  832);

  1030.     PS_INIT_VLC_STATIC(2, 1024);

  1031.     PS_INIT_VLC_STATIC(3, 1036);

  1032.     PS_INIT_VLC_STATIC(4,  544);

  1033.     PS_INIT_VLC_STATIC(5,  544);

  1034.     PS_INIT_VLC_STATIC(6,  512);

  1035.     PS_INIT_VLC_STATIC(7,  512);

  1036.     PS_INIT_VLC_STATIC(8,  512);

  1037.     PS_INIT_VLC_STATIC(9,  512);

  1038. 

  1039.     ps_tableinit();

  1040. }

  1041. 

  1042. av_cold void ff_ps_ctx_init(PSContext *ps)

  1043. {

  1044. }