/*

 * Copyright (c) 2016, Alliance for Open Media. All rights reserved

 *

 * This source code is subject to the terms of the BSD 2 Clause License and

 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License

 * was not distributed with this source code in the LICENSE file, you can

 * obtain it at https://www.aomedia.org/license/software-license. If the Alliance for Open

 * Media Patent License 1.0 was not distributed with this source code in the

 * PATENTS file, you can obtain it at https://www.aomedia.org/license/patent-license.

 */

/*!\file

  * \brief Describes film grain parameters and film grain synthesis

  *

  */

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include "grainSynthesis.h"

#include "common_dsp_rtcd.h"

#include "definitions.h"

#include "svt_log.h"

// Samples with Gaussian distribution in the range of [-2048, 2047] (12 bits)

// with zero mean and standard deviation of about 512.

// should be divided by 4 for 10-bit range and 16 for 8-bit range.

static const int32_t gaussian_sequence[2048] = {

    56,    568,   -180,  172,   124,   -84,   172,   -64,   -900,  24,    820,   224,   1248,  996,   272,   -8,

    -916,  -388,  -732,  -104,  -188,  800,   112,   -652,  -320,  -376,  140,   -252,  492,   -168,  44,    -788,

    588,   -584,  500,   -228,  12,    680,   272,   -476,  972,   -100,  652,   368,   432,   -196,  -720,  -192,

    1000,  -332,  652,   -136,  -552,  -604,  -4,    192,   -220,  -136,  1000,  -52,   372,   -96,   -624,  124,

    -24,   396,   540,   -12,   -104,  640,   464,   244,   -208,  -84,   368,   -528,  -740,  248,   -968,  -848,

    608,   376,   -60,   -292,  -40,   -156,  252,   -292,  248,   224,   -280,  400,   -244,  244,   -60,   76,

    -80,   212,   532,   340,   128,   -36,   824,   -352,  -60,   -264,  -96,   -612,  416,   -704,  220,   -204,

    640,   -160,  1220,  -408,  900,   336,   20,    -336,  -96,   -792,  304,   48,    -28,   -1232, -1172, -448,

    104,   -292,  -520,  244,   60,    -948,  0,     -708,  268,   108,   356,   -548,  488,   -344,  -136,  488,

    -196,  -224,  656,   -236,  -1128, 60,    4,     140,   276,   -676,  -376,  168,   -108,  464,   8,     564,

    64,    240,   308,   -300,  -400,  -456,  -136,  56,    120,   -408,  -116,  436,   504,   -232,  328,   844,

    -164,  -84,   784,   -168,  232,   -224,  348,   -376,  128,   568,   96,    -1244, -288,  276,   848,   832,

    -360,  656,   464,   -384,  -332,  -356,  728,   -388,  160,   -192,  468,   296,   224,   140,   -776,  -100,

    280,   4,     196,   44,    -36,   -648,  932,   16,    1428,  28,    528,   808,   772,   20,    268,   88,

    -332,  -284,  124,   -384,  -448,  208,   -228,  -1044, -328,  660,   380,   -148,  -300,  588,   240,   540,

    28,    136,   -88,   -436,  256,   296,   -1000, 1400,  0,     -48,   1056,  -136,  264,   -528,  -1108, 632,

    -484,  -592,  -344,  796,   124,   -668,  -768,  388,   1296,  -232,  -188,  -200,  -288,  -4,    308,   100,

    -168,  256,   -500,  204,   -508,  648,   -136,  372,   -272,  -120,  -1004, -552,  -548,  -384,  548,   -296,

    428,   -108,  -8,    -912,  -324,  -224,  -88,   -112,  -220,  -100,  996,   -796,  548,   360,   -216,  180,

    428,   -200,  -212,  148,   96,    148,   284,   216,   -412,  -320,  120,   -300,  -384,  -604,  -572,  -332,

    -8,    -180,  -176,  696,   116,   -88,   628,   76,    44,    -516,  240,   -208,  -40,   100,   -592,  344,

    -308,  -452,  -228,  20,    916,   -1752, -136,  -340,  -804,  140,   40,    512,   340,   248,   184,   -492,

    896,   -156,  932,   -628,  328,   -688,  -448,  -616,  -752,  -100,  560,   -1020, 180,   -800,  -64,   76,

    576,   1068,  396,   660,   552,   -108,  -28,   320,   -628,  312,   -92,   -92,   -472,  268,   16,    560,

    516,   -672,  -52,   492,   -100,  260,   384,   284,   292,   304,   -148,  88,    -152,  1012,  1064,  -228,

    164,   -376,  -684,  592,   -392,  156,   196,   -524,  -64,   -884,  160,   -176,  636,   648,   404,   -396,

    -436,  864,   424,   -728,  988,   -604,  904,   -592,  296,   -224,  536,   -176,  -920,  436,   -48,   1176,

    -884,  416,   -776,  -824,  -884,  524,   -548,  -564,  -68,   -164,  -96,   692,   364,   -692,  -1012, -68,

    260,   -480,  876,   -1116, 452,   -332,  -352,  892,   -1088, 1220,  -676,  12,    -292,  244,   496,   372,

    -32,   280,   200,   112,   -440,  -96,   24,    -644,  -184,  56,    -432,  224,   -980,  272,   -260,  144,

    -436,  420,   356,   364,   -528,  76,    172,   -744,  -368,  404,   -752,  -416,  684,   -688,  72,    540,

    416,   92,    444,   480,   -72,   -1416, 164,   -1172, -68,   24,    424,   264,   1040,  128,   -912,  -524,

    -356,  64,    876,   -12,   4,     -88,   532,   272,   -524,  320,   276,   -508,  940,   24,    -400,  -120,

    756,   60,    236,   -412,  100,   376,   -484,  400,   -100,  -740,  -108,  -260,  328,   -268,  224,   -200,

    -416,  184,   -604,  -564,  -20,   296,   60,    892,   -888,  60,    164,   68,    -760,  216,   -296,  904,

    -336,  -28,   404,   -356,  -568,  -208,  -1480, -512,  296,   328,   -360,  -164,  -1560, -776,  1156,  -428,

    164,   -504,  -112,  120,   -216,  -148,  -264,  308,   32,    64,    -72,   72,    116,   176,   -64,   -272,

    460,   -536,  -784,  -280,  348,   108,   -752,  -132,  524,   -540,  -776,  116,   -296,  -1196, -288,  -560,

    1040,  -472,  116,   -848,  -1116, 116,   636,   696,   284,   -176,  1016,  204,   -864,  -648,  -248,  356,

    972,   -584,  -204,  264,   880,   528,   -24,   -184,  116,   448,   -144,  828,   524,   212,   -212,  52,

    12,    200,   268,   -488,  -404,  -880,  824,   -672,  -40,   908,   -248,  500,   716,   -576,  492,   -576,

    16,    720,   -108,  384,   124,   344,   280,   576,   -500,  252,   104,   -308,  196,   -188,  -8,    1268,

    296,   1032,  -1196, 436,   316,   372,   -432,  -200,  -660,  704,   -224,  596,   -132,  268,   32,    -452,

    884,   104,   -1008, 424,   -1348, -280,  4,     -1168, 368,   476,   696,   300,   -8,    24,    180,   -592,

    -196,  388,   304,   500,   724,   -160,  244,   -84,   272,   -256,  -420,  320,   208,   -144,  -156,  156,

    364,   452,   28,    540,   316,   220,   -644,  -248,  464,   72,    360,   32,    -388,  496,   -680,  -48,

    208,   -116,  -408,  60,    -604,  -392,  548,   -840,  784,   -460,  656,   -544,  -388,  -264,  908,   -800,

    -628,  -612,  -568,  572,   -220,  164,   288,   -16,   -308,  308,   -112,  -636,  -760,  280,   -668,  432,

    364,   240,   -196,  604,   340,   384,   196,   592,   -44,   -500,  432,   -580,  -132,  636,   -76,   392,

    4,     -412,  540,   508,   328,   -356,  -36,   16,    -220,  -64,   -248,  -60,   24,    -192,  368,   1040,

    92,    -24,   -1044, -32,   40,    104,   148,   192,   -136,  -520,  56,    -816,  -224,  732,   392,   356,

    212,   -80,   -424,  -1008, -324,  588,   -1496, 576,   460,   -816,  -848,  56,    -580,  -92,   -1372, -112,

    -496,  200,   364,   52,    -140,  48,    -48,   -60,   84,    72,    40,    132,   -356,  -268,  -104,  -284,

    -404,  732,   -520,  164,   -304,  -540,  120,   328,   -76,   -460,  756,   388,   588,   236,   -436,  -72,

    -176,  -404,  -316,  -148,  716,   -604,  404,   -72,   -88,   -888,  -68,   944,   88,    -220,  -344,  960,

    472,   460,   -232,  704,   120,   832,   -228,  692,   -508,  132,   -476,  844,   -748,  -364,  -44,   1116,

    -1104, -1056, 76,    428,   552,   -692,  60,    356,   96,    -384,  -188,  -612,  -576,  736,   508,   892,

    352,   -1132, 504,   -24,   -352,  324,   332,   -600,  -312,  292,   508,   -144,  -8,    484,   48,    284,

    -260,  -240,  256,   -100,  -292,  -204,  -44,   472,   -204,  908,   -188,  -1000, -256,  92,    1164,  -392,

    564,   356,   652,   -28,   -884,  256,   484,   -192,  760,   -176,  376,   -524,  -452,  -436,  860,   -736,

    212,   124,   504,   -476,  468,   76,    -472,  552,   -692,  -944,  -620,  740,   -240,  400,   132,   20,

    192,   -196,  264,   -668,  -1012, -60,   296,   -316,  -828,  76,    -156,  284,   -768,  -448,  -832,  148,

    248,   652,   616,   1236,  288,   -328,  -400,  -124,  588,   220,   520,   -696,  1032,  768,   -740,  -92,

    -272,  296,   448,   -464,  412,   -200,  392,   440,   -200,  264,   -152,  -260,  320,   1032,  216,   320,

    -8,    -64,   156,   -1016, 1084,  1172,  536,   484,   -432,  132,   372,   -52,   -256,  84,    116,   -352,

    48,    116,   304,   -384,  412,   924,   -300,  528,   628,   180,   648,   44,    -980,  -220,  1320,  48,

    332,   748,   524,   -268,  -720,  540,   -276,  564,   -344,  -208,  -196,  436,   896,   88,    -392,  132,

    80,    -964,  -288,  568,   56,    -48,   -456,  888,   8,     552,   -156,  -292,  948,   288,   128,   -716,

    -292,  1192,  -152,  876,   352,   -600,  -260,  -812,  -468,  -28,   -120,  -32,   -44,   1284,  496,   192,

    464,   312,   -76,   -516,  -380,  -456,  -1012, -48,   308,   -156,  36,    492,   -156,  -808,  188,   1652,

    68,    -120,  -116,  316,   160,   -140,  352,   808,   -416,  592,   316,   -480,  56,    528,   -204,  -568,

    372,   -232,  752,   -344,  744,   -4,    324,   -416,  -600,  768,   268,   -248,  -88,   -132,  -420,  -432,

    80,    -288,  404,   -316,  -1216, -588,  520,   -108,  92,    -320,  368,   -480,  -216,  -92,   1688,  -300,

    180,   1020,  -176,  820,   -68,   -228,  -260,  436,   -904,  20,    40,    -508,  440,   -736,  312,   332,

    204,   760,   -372,  728,   96,    -20,   -632,  -520,  -560,  336,   1076,  -64,   -532,  776,   584,   192,

    396,   -728,  -520,  276,   -188,  80,    -52,   -612,  -252,  -48,   648,   212,   -688,  228,   -52,   -260,

    428,   -412,  -272,  -404,  180,   816,   -796,  48,    152,   484,   -88,   -216,  988,   696,   188,   -528,

    648,   -116,  -180,  316,   476,   12,    -564,  96,    476,   -252,  -364,  -376,  -392,  556,   -256,  -576,

    260,   -352,  120,   -16,   -136,  -260,  -492,  72,    556,   660,   580,   616,   772,   436,   424,   -32,

    -324,  -1268, 416,   -324,  -80,   920,   160,   228,   724,   32,    -516,  64,    384,   68,    -128,  136,

    240,   248,   -204,  -68,   252,   -932,  -120,  -480,  -628,  -84,   192,   852,   -404,  -288,  -132,  204,

    100,   168,   -68,   -196,  -868,  460,   1080,  380,   -80,   244,   0,     484,   -888,  64,    184,   352,

    600,   460,   164,   604,   -196,  320,   -64,   588,   -184,  228,   12,    372,   48,    -848,  -344,  224,

    208,   -200,  484,   128,   -20,   272,   -468,  -840,  384,   256,   -720,  -520,  -464,  -580,  112,   -120,

    644,   -356,  -208,  -608,  -528,  704,   560,   -424,  392,   828,   40,    84,    200,   -152,  0,     -144,

    584,   280,   -120,  80,    -556,  -972,  -196,  -472,  724,   80,    168,   -32,   88,    160,   -688,  0,

    160,   356,   372,   -776,  740,   -128,  676,   -248,  -480,  4,     -364,  96,    544,   232,   -1032, 956,

    236,   356,   20,    -40,   300,   24,    -676,  -596,  132,   1120,  -104,  532,   -1096, 568,   648,   444,

    508,   380,   188,   -376,  -604,  1488,  424,   24,    756,   -220,  -192,  716,   120,   920,   688,   168,

    44,    -460,  568,   284,   1144,  1160,  600,   424,   888,   656,   -356,  -320,  220,   316,   -176,  -724,

    -188,  -816,  -628,  -348,  -228,  -380,  1012,  -452,  -660,  736,   928,   404,   -696,  -72,   -268,  -892,

    128,   184,   -344,  -780,  360,   336,   400,   344,   428,   548,   -112,  136,   -228,  -216,  -820,  -516,

    340,   92,    -136,  116,   -300,  376,   -244,  100,   -316,  -520,  -284,  -12,   824,   164,   -548,  -180,

    -128,  116,   -924,  -828,  268,   -368,  -580,  620,   192,   160,   0,     -1676, 1068,  424,   -56,   -360,

    468,   -156,  720,   288,   -528,  556,   -364,  548,   -148,  504,   316,   152,   -648,  -620,  -684,  -24,

    -376,  -384,  -108,  -920,  -1032, 768,   180,   -264,  -508,  -1268, -260,  -60,   300,   -240,  988,   724,

    -376,  -576,  -212,  -736,  556,   192,   1092,  -620,  -880,  376,   -56,   -4,    -216,  -32,   836,   268,

    396,   1332,  864,   -600,  100,   56,    -412,  -92,   356,   180,   884,   -468,  -436,  292,   -388,  -804,

    -704,  -840,  368,   -348,  140,   -724,  1536,  940,   372,   112,   -372,  436,   -480,  1136,  296,   -32,

    -228,  132,   -48,   -220,  868,   -1016, -60,   -1044, -464,  328,   916,   244,   12,    -736,  -296,  360,

    468,   -376,  -108,  -92,   788,   368,   -56,   544,   400,   -672,  -420,  728,   16,    320,   44,    -284,

    -380,  -796,  488,   132,   204,   -596,  -372,  88,    -152,  -908,  -636,  -572,  -624,  -116,  -692,  -200,

    -56,   276,   -88,   484,   -324,  948,   864,   1000,  -456,  -184,  -276,  292,   -296,  156,   676,   320,

    160,   908,   -84,   -1236, -288,  -116,  260,   -372,  -644,  732,   -756,  -96,   84,    344,   -520,  348,

    -688,  240,   -84,   216,   -1044, -136,  -676,  -396,  -1500, 960,   -40,   176,   168,   1516,  420,   -504,

    -344,  -364,  -360,  1216,  -940,  -380,  -212,  252,   -660,  -708,  484,   -444,  -152,  928,   -120,  1112,

    476,   -260,  560,   -148,  -344,  108,   -196,  228,   -288,  504,   560,   -328,  -88,   288,   -1008, 460,

    -228,  468,   -836,  -196,  76,    388,   232,   412,   -1168, -716,  -644,  756,   -172,  -356,  -504,  116,

    432,   528,   48,    476,   -168,  -608,  448,   160,   -532,  -272,  28,    -676,  -12,   828,   980,   456,

    520,   104,   -104,  256,   -344,  -4,    -28,   -368,  -52,   -524,  -572,  -556,  -200,  768,   1124,  -208,

    -512,  176,   232,   248,   -148,  -888,  604,   -600,  -304,  804,   -156,  -212,  488,   -192,  -804,  -256,

    368,   -360,  -916,  -328,  228,   -240,  -448,  -472,  856,   -556,  -364,  572,   -12,   -156,  -368,  -340,

    432,   252,   -752,  -152,  288,   268,   -580,  -848,  -592,  108,   -76,   244,   312,   -716,  592,   -80,

    436,   360,   4,     -248,  160,   516,   584,   732,   44,    -468,  -280,  -292,  -156,  -588,  28,    308,

    912,   24,    124,   156,   180,   -252,  944,   -924,  -772,  -520,  -428,  -624,  300,   -212,  -1144, 32,

    -724,  800,   -1128, -212,  -1288, -848,  180,   -416,  440,   192,   -576,  -792,  -76,   -1080, 80,    -532,

    -352,  -132,  380,   -820,  148,   1112,  128,   164,   456,   700,   -924,  144,   -668,  -384,  648,   -832,

    508,   552,   -52,   -100,  -656,  208,   -568,  748,   -88,   680,   232,   300,   192,   -408,  -1012, -152,

    -252,  -268,  272,   -876,  -664,  -648,  -332,  -136,  16,    12,    1152,  -28,   332,   -536,  320,   -672,

    -460,  -316,  532,   -260,  228,   -40,   1052,  -816,  180,   88,    -496,  -556,  -672,  -368,  428,   92,

    356,   404,   -408,  252,   196,   -176,  -556,  792,   268,   32,    372,   40,    96,    -332,  328,   120,

    372,   -900,  -40,   472,   -264,  -592,  952,   128,   656,   112,   664,   -232,  420,   4,     -344,  -464,

    556,   244,   -416,  -32,   252,   0,     -412,  188,   -696,  508,   -476,  324,   -1096, 656,   -312,  560,

    264,   -136,  304,   160,   -64,   -580,  248,   336,   -720,  560,   -348,  -288,  -276,  -196,  -500,  852,

    -544,  -236,  -1128, -992,  -776,  116,   56,    52,    860,   884,   212,   -12,   168,   1020,  512,   -552,

    924,   -148,  716,   188,   164,   -340,  -520,  -184,  880,   -152,  -680,  -208,  -1156, -300,  -528,  -472,

    364,   100,   -744,  -1056, -32,   540,   280,   144,   -676,  -32,   -232,  -280,  -224,  96,    568,   -76,

    172,   148,   148,   104,   32,    -296,  -32,   788,   -80,   32,    -16,   280,   288,   944,   428,   -484};

static const int32_t gauss_bits = 11;

static int32_t luma_subblock_size_y = 32;

static int32_t luma_subblock_size_x = 32;

static int32_t chroma_subblock_size_y = 16;

static int32_t chroma_subblock_size_x = 16;

static const int32_t min_luma_legal_range = 16;

static const int32_t max_luma_legal_range = 235;

static const int32_t min_chroma_legal_range = 16;

static const int32_t max_chroma_legal_range = 240;

static int32_t scaling_lut_y[256];

static int32_t scaling_lut_cb[256];

static int32_t scaling_lut_cr[256];

static int32_t grain_center;

static int32_t grain_min;

static int32_t grain_max;

static uint16_t random_register = 0; // random number generator register

static void init_arrays(const AomFilmGrain* params, int32_t luma_stride, int32_t chroma_stride,

                        int32_t*** pred_pos_luma_p, int32_t*** pred_pos_chroma_p, int32_t** luma_grain_block,

                        int32_t** cb_grain_block, int32_t** cr_grain_block, int32_t** y_line_buf, int32_t** cb_line_buf,

                        int32_t** cr_line_buf, int32_t** y_col_buf, int32_t** cb_col_buf, int32_t** cr_col_buf,

                        int32_t luma_grain_samples, int32_t chroma_grain_samples, int32_t chroma_subsamp_y,

                        int32_t chroma_subsamp_x) {

    memset(scaling_lut_y, 0, sizeof(*scaling_lut_y) * 256);

    memset(scaling_lut_cb, 0, sizeof(*scaling_lut_cb) * 256);

    memset(scaling_lut_cr, 0, sizeof(*scaling_lut_cr) * 256);

    int32_t num_pos_luma   = 2 * params->ar_coeff_lag * (params->ar_coeff_lag + 1);

    int32_t num_pos_chroma = num_pos_luma;

    if (params->num_y_points > 0) {

        ++num_pos_chroma;

    }

    int32_t** pred_pos_luma;

    int32_t** pred_pos_chroma;

    pred_pos_luma = (int32_t**)malloc(sizeof(*pred_pos_luma) * num_pos_luma);

    ASSERT(pred_pos_luma != NULL);

    for (int32_t row = 0; row < num_pos_luma; row++) {

        pred_pos_luma[row] = (int32_t*)malloc(sizeof(**pred_pos_luma) * 3);

        ASSERT(pred_pos_luma[row]);

    }

    pred_pos_chroma = (int32_t**)malloc(sizeof(*pred_pos_chroma) * num_pos_chroma);

    ASSERT(pred_pos_chroma != NULL);

    for (int32_t row = 0; row < num_pos_chroma; row++) {

        pred_pos_chroma[row] = (int32_t*)malloc(sizeof(**pred_pos_chroma) * 3);

        ASSERT(pred_pos_chroma[row]);

    }

    int32_t pos_ar_index = 0;

    for (int32_t row = -params->ar_coeff_lag; row < 0; row++) {

        for (int32_t col = -params->ar_coeff_lag; col < params->ar_coeff_lag + 1; col++) {

            pred_pos_luma[pos_ar_index][0] = row;

            pred_pos_luma[pos_ar_index][1] = col;

            pred_pos_luma[pos_ar_index][2] = 0;

            pred_pos_chroma[pos_ar_index][0] = row;

            pred_pos_chroma[pos_ar_index][1] = col;

            pred_pos_chroma[pos_ar_index][2] = 0;

            ++pos_ar_index;

        }

    }

    for (int32_t col = -params->ar_coeff_lag; col < 0; col++) {

        pred_pos_luma[pos_ar_index][0] = 0;

        pred_pos_luma[pos_ar_index][1] = col;

        pred_pos_luma[pos_ar_index][2] = 0;

        pred_pos_chroma[pos_ar_index][0] = 0;

        pred_pos_chroma[pos_ar_index][1] = col;

        pred_pos_chroma[pos_ar_index][2] = 0;

        ++pos_ar_index;

    }

    if (params->num_y_points > 0) {

        pred_pos_chroma[pos_ar_index][0] = 0;

        pred_pos_chroma[pos_ar_index][1] = 0;

        pred_pos_chroma[pos_ar_index][2] = 1;

    }

    *pred_pos_luma_p   = pred_pos_luma;

    *pred_pos_chroma_p = pred_pos_chroma;

    *y_line_buf  = (int32_t*)malloc(sizeof(**y_line_buf) * luma_stride * 2);

    *cb_line_buf = (int32_t*)malloc(sizeof(**cb_line_buf) * chroma_stride * (2 >> chroma_subsamp_y));

    *cr_line_buf = (int32_t*)malloc(sizeof(**cr_line_buf) * chroma_stride * (2 >> chroma_subsamp_y));

    *y_col_buf  = (int32_t*)malloc(sizeof(**y_col_buf) * (luma_subblock_size_y + 2) * 2);

    *cb_col_buf = (int32_t*)malloc(sizeof(**cb_col_buf) * (chroma_subblock_size_y + (2 >> chroma_subsamp_y)) *

                                   (2 >> chroma_subsamp_x));

    *cr_col_buf = (int32_t*)malloc(sizeof(**cr_col_buf) * (chroma_subblock_size_y + (2 >> chroma_subsamp_y)) *

                                   (2 >> chroma_subsamp_x));

    *luma_grain_block = (int32_t*)malloc(sizeof(**luma_grain_block) * luma_grain_samples);

    *cb_grain_block   = (int32_t*)malloc(sizeof(**cb_grain_block) * chroma_grain_samples);

    *cr_grain_block   = (int32_t*)malloc(sizeof(**cr_grain_block) * chroma_grain_samples);

}

static void dealloc_arrays(const AomFilmGrain* params, int32_t*** pred_pos_luma, int32_t*** pred_pos_chroma,

                           int32_t** luma_grain_block, int32_t** cb_grain_block, int32_t** cr_grain_block,

                           int32_t** y_line_buf, int32_t** cb_line_buf, int32_t** cr_line_buf, int32_t** y_col_buf,

                           int32_t** cb_col_buf, int32_t** cr_col_buf) {

    int32_t num_pos_luma   = 2 * params->ar_coeff_lag * (params->ar_coeff_lag + 1);

    int32_t num_pos_chroma = num_pos_luma;

    if (params->num_y_points > 0) {

        ++num_pos_chroma;

    }

    for (int32_t row = 0; row < num_pos_luma; row++) {

        free((*pred_pos_luma)[row]);

    }

    free(*pred_pos_luma);

    for (int32_t row = 0; row < num_pos_chroma; row++) {

        free((*pred_pos_chroma)[row]);

    }

    free((*pred_pos_chroma));

    free(*y_line_buf);

    free(*cb_line_buf);

    free(*cr_line_buf);

    free(*y_col_buf);

    free(*cb_col_buf);

    free(*cr_col_buf);

    free(*luma_grain_block);

    free(*cb_grain_block);

    free(*cr_grain_block);

}

// get a number between 0 and 2^bits - 1

static INLINE int32_t get_random_number(int32_t bits) {

    uint16_t bit;

    bit = ((random_register >> 0) ^ (random_register >> 1) ^ (random_register >> 3) ^ (random_register >> 12)) & 1;

    random_register = (random_register >> 1) | (bit << 15);

    return (random_register >> (16 - bits)) & ((1 << bits) - 1);

}

static void init_random_generator(int32_t luma_line, uint16_t seed) {

    // same for the picture

    uint16_t msb = (seed >> 8) & 255;

    uint16_t lsb = seed & 255;

    random_register = (msb << 8) + lsb;

    //  changes for each row

    int32_t luma_num = luma_line >> 5;

    random_register ^= ((luma_num * 37 + 178) & 255) << 8;

    random_register ^= ((luma_num * 173 + 105) & 255);

}

static void generate_luma_grain_block(const AomFilmGrain* params, int32_t** pred_pos_luma, int32_t* luma_grain_block,

                                      int32_t luma_block_size_y, int32_t luma_block_size_x, int32_t luma_grain_stride,

                                      int32_t left_pad, int32_t top_pad, int32_t right_pad, int32_t bottom_pad) {

    if (params->num_y_points == 0) {

        return;

    }

    int32_t bit_depth       = params->bit_depth;

    int32_t gauss_sec_shift = 12 - bit_depth + params->grain_scale_shift;

    int32_t num_pos_luma    = 2 * params->ar_coeff_lag * (params->ar_coeff_lag + 1);

    int32_t rounding_offset = (1 << (params->ar_coeff_shift - 1));

    for (int32_t i = 0; i < luma_block_size_y; i++) {

        for (int32_t j = 0; j < luma_block_size_x; j++) {

            luma_grain_block[i * luma_grain_stride + j] = (gaussian_sequence[get_random_number(gauss_bits)] +

                                                           ((1 << gauss_sec_shift) >> 1)) >>

                gauss_sec_shift;

        }

    }

    for (int32_t i = top_pad; i < luma_block_size_y - bottom_pad; i++) {

        for (int32_t j = left_pad; j < luma_block_size_x - right_pad; j++) {

            int32_t wsum = 0;

            for (int32_t pos = 0; pos < num_pos_luma; pos++) {

                wsum = wsum +

                    params->ar_coeffs_y[pos] *

                        luma_grain_block[(i + pred_pos_luma[pos][0]) * luma_grain_stride + j + pred_pos_luma[pos][1]];

            }

            luma_grain_block[i * luma_grain_stride + j] = clamp(

                luma_grain_block[i * luma_grain_stride + j] + ((wsum + rounding_offset) >> params->ar_coeff_shift),

                grain_min,

                grain_max);

        }

    }

}

static void generate_chroma_grain_blocks(const AomFilmGrain* params,

                                         //                                  int32_t** pred_pos_luma,

                                         int32_t** pred_pos_chroma, int32_t* luma_grain_block, int32_t* cb_grain_block,

                                         int32_t* cr_grain_block, int32_t luma_grain_stride,

                                         int32_t chroma_block_size_y, int32_t chroma_block_size_x,

                                         int32_t chroma_grain_stride, int32_t left_pad, int32_t top_pad,

                                         int32_t right_pad, int32_t bottom_pad, int32_t chroma_subsamp_y,

                                         int32_t chroma_subsamp_x) {

    int32_t bit_depth       = params->bit_depth;

    int32_t gauss_sec_shift = 12 - bit_depth + params->grain_scale_shift;

    int32_t num_pos_chroma = 2 * params->ar_coeff_lag * (params->ar_coeff_lag + 1);

    if (params->num_y_points > 0) {

        ++num_pos_chroma;

    }

    int32_t rounding_offset = (1 << (params->ar_coeff_shift - 1));

    int chroma_grain_block_size = chroma_block_size_y * chroma_grain_stride;

    if (params->num_cb_points || params->chroma_scaling_from_luma) {

        init_random_generator(7 << 5, params->random_seed);

        for (int32_t i = 0; i < chroma_block_size_y; i++) {

            for (int32_t j = 0; j < chroma_block_size_x; j++) {

                cb_grain_block[i * chroma_grain_stride + j] = (gaussian_sequence[get_random_number(gauss_bits)] +

                                                               ((1 << gauss_sec_shift) >> 1)) >>

                    gauss_sec_shift;

            }

        }

    } else {

        memset(cb_grain_block, 0, sizeof(*cb_grain_block) * chroma_grain_block_size);

    }

    if (params->num_cr_points || params->chroma_scaling_from_luma) {

        init_random_generator(11 << 5, params->random_seed);

        for (int32_t i = 0; i < chroma_block_size_y; i++) {

            for (int32_t j = 0; j < chroma_block_size_x; j++) {

                cr_grain_block[i * chroma_grain_stride + j] = (gaussian_sequence[get_random_number(gauss_bits)] +

                                                               ((1 << gauss_sec_shift) >> 1)) >>

                    gauss_sec_shift;

            }

        }

    } else {

        memset(cr_grain_block, 0, sizeof(*cr_grain_block) * chroma_grain_block_size);

    }

    for (int32_t i = top_pad; i < chroma_block_size_y - bottom_pad; i++) {

        for (int32_t j = left_pad; j < chroma_block_size_x - right_pad; j++) {

            int32_t wsum_cb = 0;

            int32_t wsum_cr = 0;

            for (int32_t pos = 0; pos < num_pos_chroma; pos++) {

                if (pred_pos_chroma[pos][2] == 0) {

                    wsum_cb = wsum_cb +

                        params->ar_coeffs_cb[pos] *

                            cb_grain_block[(i + pred_pos_chroma[pos][0]) * chroma_grain_stride + j +

                                           pred_pos_chroma[pos][1]];

                    wsum_cr = wsum_cr +

                        params->ar_coeffs_cr[pos] *

                            cr_grain_block[(i + pred_pos_chroma[pos][0]) * chroma_grain_stride + j +

                                           pred_pos_chroma[pos][1]];

                } else if (pred_pos_chroma[pos][2] == 1) {

                    int32_t av_luma      = 0;

                    int32_t luma_coord_y = ((i - top_pad) << chroma_subsamp_y) + top_pad;

                    int32_t luma_coord_x = ((j - left_pad) << chroma_subsamp_x) + left_pad;

                    for (int32_t k = luma_coord_y; k < luma_coord_y + chroma_subsamp_y + 1; k++) {

                        for (int32_t l = luma_coord_x; l < luma_coord_x + chroma_subsamp_x + 1; l++) {

                            av_luma += luma_grain_block[k * luma_grain_stride + l];

                        }

                    }

                    av_luma = (av_luma + ((1 << (chroma_subsamp_y + chroma_subsamp_x)) >> 1)) >>

                        (chroma_subsamp_y + chroma_subsamp_x);

                    wsum_cb = wsum_cb + params->ar_coeffs_cb[pos] * av_luma;

                    wsum_cr = wsum_cr + params->ar_coeffs_cr[pos] * av_luma;

                } else {

                    SVT_ERROR(

                        "Grain synthesis: prediction between two chroma components is "

                        "not supported!");

                    exit(1);

                }

            }

            if (params->num_cb_points || params->chroma_scaling_from_luma) {

                cb_grain_block[i * chroma_grain_stride + j] = clamp(

                    cb_grain_block[i * chroma_grain_stride + j] +

                        ((wsum_cb + rounding_offset) >> params->ar_coeff_shift),

                    grain_min,

                    grain_max);

            }

            if (params->num_cr_points || params->chroma_scaling_from_luma) {

                cr_grain_block[i * chroma_grain_stride + j] = clamp(

                    cr_grain_block[i * chroma_grain_stride + j] +

                        ((wsum_cr + rounding_offset) >> params->ar_coeff_shift),

                    grain_min,

                    grain_max);

            }

        }

    }

}

static void init_scaling_function(const int32_t scaling_points[][2], int32_t num_points, int32_t scaling_lut[]) {

    if (num_points == 0) {

        return;

    }

    for (int32_t i = 0; i < scaling_points[0][0]; i++) {

        scaling_lut[i] = scaling_points[0][1];

    }

    for (int32_t point = 0; point < num_points - 1; point++) {

        int64_t delta_y = scaling_points[point + 1][1] - scaling_points[point][1];

        int64_t delta_x = scaling_points[point + 1][0] - scaling_points[point][0];

        int64_t delta = delta_y * ((65536 + (delta_x >> 1)) / delta_x);

        for (int32_t x = 0; x < delta_x; x++) {

            scaling_lut[scaling_points[point][0] + x] = scaling_points[point][1] + (int32_t)((x * delta + 32768) >> 16);

        }

    }

    for (int32_t i = scaling_points[num_points - 1][0]; i < 256; i++) {

        scaling_lut[i] = scaling_points[num_points - 1][1];

    }

}

// function that extracts samples from a lut (and interpolates intemediate

// frames for 10- and 12-bit video)

static int32_t scale_lut(int32_t* scaling_lut, int32_t index, int32_t bit_depth) {

    int32_t x = index >> (bit_depth - 8);

    if (!(bit_depth - 8) || x == 255) {

        return scaling_lut[x];

    } else {

        return scaling_lut[x] +

            (((scaling_lut[x + 1] - scaling_lut[x]) * (index & ((1 << (bit_depth - 8)) - 1)) +

              (1 << (bit_depth - 9))) >>

             (bit_depth - 8));

    }

}

static void add_noise_to_block(const AomFilmGrain* params, uint8_t* luma, uint8_t* cb, uint8_t* cr, int32_t luma_stride,

                               int32_t chroma_stride, int32_t* luma_grain, int32_t* cb_grain, int32_t* cr_grain,

                               int32_t luma_grain_stride, int32_t chroma_grain_stride, int32_t half_luma_height,

                               int32_t half_luma_width, int32_t bit_depth, int32_t chroma_subsamp_y,

                               int32_t chroma_subsamp_x) {

    int32_t cb_mult      = params->cb_mult - 128; // fixed scale

    int32_t cb_luma_mult = params->cb_luma_mult - 128; // fixed scale

    int32_t cb_offset    = params->cb_offset - 256;

    int32_t cr_mult      = params->cr_mult - 128; // fixed scale

    int32_t cr_luma_mult = params->cr_luma_mult - 128; // fixed scale

    int32_t cr_offset    = params->cr_offset - 256;

    int32_t rounding_offset = (1 << (params->scaling_shift - 1));

    int32_t apply_y  = params->num_y_points > 0 ? 1 : 0;

    int32_t apply_cb = (params->num_cb_points > 0 || params->chroma_scaling_from_luma) ? 1 : 0;

    int32_t apply_cr = (params->num_cr_points > 0 || params->chroma_scaling_from_luma) ? 1 : 0;

    if (params->chroma_scaling_from_luma) {

        cb_mult      = 0; // fixed scale

        cb_luma_mult = 64; // fixed scale

        cb_offset    = 0;

        cr_mult      = 0; // fixed scale

        cr_luma_mult = 64; // fixed scale

        cr_offset    = 0;

    }

    int32_t min_luma, max_luma, min_chroma, max_chroma;

    if (params->clip_to_restricted_range) {

        min_luma = min_luma_legal_range;

        max_luma = max_luma_legal_range;

        min_chroma = min_chroma_legal_range;

        max_chroma = max_chroma_legal_range;

    } else {

        min_luma = min_chroma = 0;

        max_luma = max_chroma = 255;

    }

    for (int32_t i = 0; i < (half_luma_height << (1 - chroma_subsamp_y)); i++) {

        for (int32_t j = 0; j < (half_luma_width << (1 - chroma_subsamp_x)); j++) {

            int32_t average_luma = 0;

            if (chroma_subsamp_x) {

                average_luma = (luma[(i << chroma_subsamp_y) * luma_stride + (j << chroma_subsamp_x)] +

                                luma[(i << chroma_subsamp_y) * luma_stride + (j << chroma_subsamp_x) + 1] + 1) >>

                    1;

            } else {

                average_luma = luma[(i << chroma_subsamp_y) * luma_stride + j];

            }

            if (apply_cb) {

                cb[i * chroma_stride + j] = clamp(

                    cb[i * chroma_stride + j] +

                        ((scale_lut(scaling_lut_cb,

                                    clamp(((average_luma * cb_luma_mult + cb_mult * cb[i * chroma_stride + j]) >> 6) +

                                              cb_offset,

                                          0,

                                          (256 << (bit_depth - 8)) - 1),

                                    8) *

                              cb_grain[i * chroma_grain_stride + j] +

                          rounding_offset) >>

                         params->scaling_shift),

                    min_chroma,

                    max_chroma);

            }

            if (apply_cr) {

                cr[i * chroma_stride + j] = clamp(

                    cr[i * chroma_stride + j] +

                        ((scale_lut(scaling_lut_cr,

                                    clamp(((average_luma * cr_luma_mult + cr_mult * cr[i * chroma_stride + j]) >> 6) +

                                              cr_offset,

                                          0,

                                          (256 << (bit_depth - 8)) - 1),

                                    8) *

                              cr_grain[i * chroma_grain_stride + j] +

                          rounding_offset) >>

                         params->scaling_shift),

                    min_chroma,

                    max_chroma);

            }

        }

    }

    if (apply_y) {

        for (int32_t i = 0; i < (half_luma_height << 1); i++) {

            for (int32_t j = 0; j < (half_luma_width << 1); j++) {

                luma[i * luma_stride + j] = clamp(luma[i * luma_stride + j] +

                                                      ((scale_lut(scaling_lut_y, luma[i * luma_stride + j], 8) *

                                                            luma_grain[i * luma_grain_stride + j] +

                                                        rounding_offset) >>

                                                       params->scaling_shift),

                                                  min_luma,

                                                  max_luma);

            }

        }

    }

}

static void add_noise_to_block_hbd(const AomFilmGrain* params, uint16_t* luma, uint16_t* cb, uint16_t* cr,

                                   int32_t luma_stride, int32_t chroma_stride, int32_t* luma_grain, int32_t* cb_grain,

                                   int32_t* cr_grain, int32_t luma_grain_stride, int32_t chroma_grain_stride,

                                   int32_t half_luma_height, int32_t half_luma_width, int32_t bit_depth,

                                   int32_t chroma_subsamp_y, int32_t chroma_subsamp_x) {

    int32_t cb_mult      = params->cb_mult - 128; // fixed scale

    int32_t cb_luma_mult = params->cb_luma_mult - 128; // fixed scale

    // offset value depends on the bit depth

    int32_t cb_offset = (params->cb_offset << (bit_depth - 8)) - (1 << bit_depth);

    int32_t cr_mult      = params->cr_mult - 128; // fixed scale

    int32_t cr_luma_mult = params->cr_luma_mult - 128; // fixed scale

    // offset value depends on the bit depth

    int32_t cr_offset = (params->cr_offset << (bit_depth - 8)) - (1 << bit_depth);

    int32_t rounding_offset = (1 << (params->scaling_shift - 1));

    int32_t apply_y  = params->num_y_points > 0 ? 1 : 0;

    int32_t apply_cb = params->num_cb_points > 0 ? 1 : 0;

    int32_t apply_cr = params->num_cr_points > 0 ? 1 : 0;

    if (params->chroma_scaling_from_luma) {

        cb_mult      = 0; // fixed scale

        cb_luma_mult = 64; // fixed scale

        cb_offset    = 0;

        cr_mult      = 0; // fixed scale

        cr_luma_mult = 64; // fixed scale

        cr_offset    = 0;

    }

    int32_t min_luma, max_luma, min_chroma, max_chroma;

    if (params->clip_to_restricted_range) {

        min_luma = min_luma_legal_range << (bit_depth - 8);

        max_luma = max_luma_legal_range << (bit_depth - 8);

        min_chroma = min_chroma_legal_range << (bit_depth - 8);

        max_chroma = max_chroma_legal_range << (bit_depth - 8);

    } else {

        min_luma = min_chroma = 0;

        max_luma = max_chroma = (256 << (bit_depth - 8)) - 1;

    }

    for (int32_t i = 0; i < (half_luma_height << (1 - chroma_subsamp_y)); i++) {

        for (int32_t j = 0; j < (half_luma_width << (1 - chroma_subsamp_x)); j++) {

            int32_t average_luma = 0;

            if (chroma_subsamp_x) {

                average_luma = (luma[(i << chroma_subsamp_y) * luma_stride + (j << chroma_subsamp_x)] +

                                luma[(i << chroma_subsamp_y) * luma_stride + (j << chroma_subsamp_x) + 1] + 1) >>

                    1;

            } else {

                average_luma = luma[(i << chroma_subsamp_y) * luma_stride + j];

            }

            if (apply_cb) {

                cb[i * chroma_stride + j] = clamp(

                    cb[i * chroma_stride + j] +

                        ((scale_lut(scaling_lut_cb,

                                    clamp(((average_luma * cb_luma_mult + cb_mult * cb[i * chroma_stride + j]) >> 6) +

                                              cb_offset,

                                          0,

                                          (256 << (bit_depth - 8)) - 1),

                                    bit_depth) *

                              cb_grain[i * chroma_grain_stride + j] +

                          rounding_offset) >>

                         params->scaling_shift),

                    min_chroma,

                    max_chroma);

            }

            if (apply_cr) {

                cr[i * chroma_stride + j] = clamp(

                    cr[i * chroma_stride + j] +

                        ((scale_lut(scaling_lut_cr,

                                    clamp(((average_luma * cr_luma_mult + cr_mult * cr[i * chroma_stride + j]) >> 6) +

                                              cr_offset,

                                          0,

                                          (256 << (bit_depth - 8)) - 1),

                                    bit_depth) *

                              cr_grain[i * chroma_grain_stride + j] +

                          rounding_offset) >>

                         params->scaling_shift),

                    min_chroma,

                    max_chroma);

            }

        }

    }

    if (apply_y) {

        for (int32_t i = 0; i < (half_luma_height << 1); i++) {

            for (int32_t j = 0; j < (half_luma_width << 1); j++) {

                luma[i * luma_stride + j] = clamp(luma[i * luma_stride + j] +

                                                      ((scale_lut(scaling_lut_y, luma[i * luma_stride + j], bit_depth) *

                                                            luma_grain[i * luma_grain_stride + j] +

                                                        rounding_offset) >>

                                                       params->scaling_shift),

                                                  min_luma,

                                                  max_luma);

            }

        }

    }

}

int32_t svt_aom_film_grain_params_equal(const AomFilmGrain* pars_a, const AomFilmGrain* pars_b) {

    if (pars_a->apply_grain != pars_b->apply_grain) {

        return 0;

    }

    if (pars_a->overlap_flag != pars_b->overlap_flag) {

        return 0;

    }

    if (pars_a->clip_to_restricted_range != pars_b->clip_to_restricted_range) {

        return 0;

    }

    if (pars_a->chroma_scaling_from_luma != pars_b->chroma_scaling_from_luma) {

        return 0;

    }

    if (pars_a->grain_scale_shift != pars_b->grain_scale_shift) {

        return 0;

    }

    if (pars_a->ar_coeff_shift != pars_b->ar_coeff_shift) {

        return 0;

    }

    if (pars_a->cb_mult != pars_b->cb_mult) {

        return 0;

    }

    if (pars_a->cb_luma_mult != pars_b->cb_luma_mult) {

        return 0;

    }

    if (pars_a->cb_offset != pars_b->cb_offset) {

        return 0;

    }

    if (pars_a->cr_mult != pars_b->cr_mult) {

        return 0;

    }

    if (pars_a->cr_luma_mult != pars_b->cr_luma_mult) {

        return 0;

    }

    if (pars_a->cr_offset != pars_b->cr_offset) {

        return 0;

    }

    if (pars_a->scaling_shift != pars_b->scaling_shift) {

        return 0;

    }

    if (pars_a->ar_coeff_lag != pars_b->ar_coeff_lag) {

        return 0;

    }

    if (pars_a->num_y_points != pars_b->num_y_points) {

        return 0;

    }

    if (pars_a->num_cb_points != pars_b->num_cb_points) {

        return 0;

    }

    if (pars_a->num_cr_points != pars_b->num_cr_points) {

        return 0;

    }

    if (memcmp(pars_a->scaling_points_y, pars_b->scaling_points_y, sizeof(pars_b->scaling_points_y))) {

        return 0;

    }

    if (memcmp(pars_a->scaling_points_cb, pars_b->scaling_points_cb, sizeof(pars_b->scaling_points_cb))) {

        return 0;

    }

    if (memcmp(pars_a->scaling_points_cr, pars_b->scaling_points_cr, sizeof(pars_b->scaling_points_cr))) {

        return 0;

    }

    if (memcmp(pars_a->ar_coeffs_y, pars_b->ar_coeffs_y, sizeof(pars_b->ar_coeffs_y))) {

        return 0;

    }

    if (memcmp(pars_a->ar_coeffs_cb, pars_b->ar_coeffs_cb, sizeof(pars_b->ar_coeffs_cb))) {

        return 0;

    }

    if (memcmp(pars_a->ar_coeffs_cr, pars_b->ar_coeffs_cr, sizeof(pars_b->ar_coeffs_cr))) {

        return 0;

    }

    return 1;

}

void svt_aom_fgn_copy_rect(uint8_t* src, int32_t src_stride, uint8_t* dst, int32_t dst_stride, int32_t width,

                           int32_t height, int32_t use_high_bit_depth) {

    int32_t hbd_coeff = use_high_bit_depth ? 2 : 1;

    while (height) {

        svt_memcpy(dst, src, width * sizeof(uint8_t) * hbd_coeff);

        src += src_stride * hbd_coeff;

        dst += dst_stride * hbd_coeff;

        --height;

    }

    return;

}

static void copy_area(int32_t* src, int32_t src_stride, int32_t* dst, int32_t dst_stride, int32_t width,

                      int32_t height) {

    while (height) {

        if (svt_memcpy != NULL) {

            svt_memcpy(dst, src, width * sizeof(*src));

        } else {

            svt_memcpy_c(dst, src, width * sizeof(*src));

        }

        src += src_stride;

        dst += dst_stride;

        --height;

    }

    return;

}

static void ver_boundary_overlap(int32_t* left_block, int32_t left_stride, int32_t* right_block, int32_t right_stride,

                                 int32_t* dst_block, int32_t dst_stride, int32_t width, int32_t height) {

    if (width == 1) {

        while (height) {

            *dst_block = clamp((*left_block * 23 + *right_block * 22 + 16) >> 5, grain_min, grain_max);

            left_block += left_stride;

            right_block += right_stride;

            dst_block += dst_stride;

            --height;

        }

        return;

    } else if (width == 2) {

        while (height) {

            dst_block[0] = clamp((27 * left_block[0] + 17 * right_block[0] + 16) >> 5, grain_min, grain_max);

            dst_block[1] = clamp((17 * left_block[1] + 27 * right_block[1] + 16) >> 5, grain_min, grain_max);

            left_block += left_stride;

            right_block += right_stride;

            dst_block += dst_stride;

            --height;

        }

        return;

    }

}

static void hor_boundary_overlap(int32_t* top_block, int32_t top_stride, int32_t* bottom_block, int32_t bottom_stride,

                                 int32_t* dst_block, int32_t dst_stride, int32_t width, int32_t height) {

    if (height == 1) {

        while (width) {

            *dst_block = clamp((*top_block * 23 + *bottom_block * 22 + 16) >> 5, grain_min, grain_max);

            ++top_block;

            ++bottom_block;

            ++dst_block;

            --width;

        }

        return;

    } else if (height == 2) {

        while (width) {

            dst_block[0]          = clamp((27 * top_block[0] + 17 * bottom_block[0] + 16) >> 5, grain_min, grain_max);

            dst_block[dst_stride] = clamp(

                (17 * top_block[top_stride] + 27 * bottom_block[bottom_stride] + 16) >> 5, grain_min, grain_max);

            ++top_block;

            ++bottom_block;

            ++dst_block;

            --width;

        }

        return;

    }

}

void svt_av1_add_film_grain_run(const AomFilmGrain* params, uint8_t* luma, uint8_t* cb, uint8_t* cr, int32_t height,

                                int32_t width, int32_t luma_stride, int32_t chroma_stride, int32_t use_high_bit_depth,

                                int32_t chroma_subsamp_y, int32_t chroma_subsamp_x) {

    int32_t** pred_pos_luma;

    int32_t** pred_pos_chroma;

    int32_t*  luma_grain_block;

    int32_t*  cb_grain_block;

    int32_t*  cr_grain_block;

    int32_t* y_line_buf;

    int32_t* cb_line_buf;

    int32_t* cr_line_buf;

    int32_t* y_col_buf;

    int32_t* cb_col_buf;

    int32_t* cr_col_buf;

    random_register = params->random_seed;

    int32_t left_pad   = 3;

    int32_t right_pad  = 3; // padding to offset for AR coefficients

    int32_t top_pad    = 3;

    int32_t bottom_pad = 0;

    int32_t ar_padding = 3; // maximum lag used for stabilization of AR coefficients

    luma_subblock_size_y = 32;