/*****************************************************************************
 * This file is part of Kvazaar HEVC encoder.
 *
 * Copyright (c) 2021, Tampere University, ITU/ISO/IEC, project contributors
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * 
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 * 
 * * Redistributions in binary form must reproduce the above copyright notice, this
 *   list of conditions and the following disclaimer in the documentation and/or
 *   other materials provided with the distribution.
 * 
 * * Neither the name of the Tampere University or ITU/ISO/IEC nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * INCLUDING NEGLIGENCE OR OTHERWISE ARISING IN ANY WAY OUT OF THE USE OF THIS
 ****************************************************************************/

#include "cfg.h"
#include "gop.h"

#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>


kvz_config *kvz_config_alloc(void)
{
  return calloc(1, sizeof(kvz_config));
}

int kvz_config_init(kvz_config *cfg)
{
  cfg->width           = 0;
  cfg->height          = 0;
  cfg->framerate       = 25; // deprecated and will be removed.
  cfg->framerate_num   = 25;
  cfg->framerate_denom = 1;
  cfg->qp              = 22;
  cfg->intra_qp_offset = 0;
  cfg->intra_qp_offset_auto = true;
  cfg->intra_period    = 64;
  cfg->vps_period      = 0;
  cfg->deblock_enable  = 1;
  cfg->deblock_beta    = 0;
  cfg->deblock_tc      = 0;
  cfg->sao_type        = 3;
  cfg->rdoq_enable     = 1;
  cfg->rdoq_skip       = 1;
  cfg->signhide_enable = true;
  cfg->smp_enable      = false;
  cfg->amp_enable      = false;
  cfg->rdo             = 1;
  cfg->mv_rdo          = 0;
  cfg->full_intra_search = 0;
  cfg->trskip_enable   = 0;
  cfg->tr_depth_intra  = 0;
  cfg->ime_algorithm   = 0; /* hexbs */
  cfg->fme_level       = 4;
  cfg->source_scan_type = 0; /* progressive */
  cfg->vui.sar_width   = 0;
  cfg->vui.sar_height  = 0;
  cfg->vui.overscan    = 0; /* undef */
  cfg->vui.videoformat = 5; /* undef */
  cfg->vui.fullrange   = 0; /* limited range */
  cfg->vui.colorprim   = 2; /* undef */
  cfg->vui.transfer    = 2; /* undef */
  cfg->vui.colormatrix = 2; /* undef */
  cfg->vui.chroma_loc  = 0; /* left center */
  cfg->aud_enable      = 0;
  cfg->cqmfile         = NULL;
  cfg->fast_coeff_table_fn = NULL;
  cfg->ref_frames      = 1;
  cfg->gop_len         = 4;
  cfg->gop_lowdelay    = true;
  cfg->bipred          = 0;
  cfg->target_bitrate  = 0;
  cfg->hash            = KVZ_HASH_CHECKSUM;
  cfg->lossless        = false;
  cfg->tmvp_enable     = true;
  cfg->implicit_rdpcm  = false;
  cfg->fast_residual_cost_limit = 0;

  cfg->cu_split_termination = KVZ_CU_SPLIT_TERMINATION_ZERO;

  cfg->tiles_width_count  = 1;
  cfg->tiles_height_count = 1;
  cfg->tiles_width_split  = NULL;
  cfg->tiles_height_split = NULL;

  cfg->wpp = 1;
  cfg->owf = -1;
  cfg->slice_count = 1;
  cfg->slice_addresses_in_ts = MALLOC(int32_t, 1);
  cfg->slice_addresses_in_ts[0] = 0;

  cfg->threads = -1;
  cfg->cpuid = 1;

  // Defaults for what sizes of PUs are tried.
  memset( cfg->pu_depth_inter.min, -1, sizeof( cfg->pu_depth_inter.min ) );
  memset( cfg->pu_depth_inter.max, -1, sizeof( cfg->pu_depth_inter.max ) );
  memset( cfg->pu_depth_intra.min, -1, sizeof( cfg->pu_depth_intra.min ) );
  memset( cfg->pu_depth_intra.max, -1, sizeof( cfg->pu_depth_intra.max ) );
  *cfg->pu_depth_inter.min = 2; // 0-3
  *cfg->pu_depth_inter.max = 3; // 0-3
  *cfg->pu_depth_intra.min = 2; // 0-4
  *cfg->pu_depth_intra.max = 3; // 0-4

  cfg->add_encoder_info = true;
  cfg->calc_psnr = true;

  cfg->mv_constraint = KVZ_MV_CONSTRAIN_NONE;
  cfg->crypto_features = KVZ_CRYPTO_OFF;

  cfg->me_early_termination = 1;
  cfg->intra_rdo_et         = 0;

  cfg->input_format = KVZ_FORMAT_P420;
  cfg->input_bitdepth = 8;

  cfg->gop_lp_definition.d = 3;
  cfg->gop_lp_definition.t = 1;
  cfg->open_gop = true;

  cfg->roi.file_path = NULL;
  cfg->roi.format = KVZ_ROI_TXT;

  cfg->set_qp_in_cu = false;

  cfg->erp_aqp = false;

  cfg->slices = KVZ_SLICES_NONE;

  cfg->optional_key = NULL;

  cfg->level = 62; // default hevc level, 6.2 (the highest)
  cfg->force_level = true; // don't care about level limits by-default
  cfg->high_tier = false;

  cfg->me_max_steps = (uint32_t)-1;

  cfg->vaq = 0;

  cfg->scaling_list = KVZ_SCALING_LIST_OFF;

  cfg->max_merge = 5;
  cfg->early_skip = true;

  cfg->ml_pu_depth_intra = false;

  cfg->partial_coding.startCTU_x = 0;
  cfg->partial_coding.startCTU_y = 0;
  cfg->partial_coding.fullWidth = 0;
  cfg->partial_coding.fullHeight = 0;

  cfg->zero_coeff_rdo = true;

  cfg->rc_algorithm = KVZ_NO_RC;
  cfg->intra_bit_allocation = false;
  cfg->clip_neighbour = true;

  cfg->file_format = KVZ_FORMAT_AUTO;

  cfg->stats_file_prefix = NULL;

  cfg->fastrd_sampling_on = 0;
  cfg->fastrd_accuracy_check_on = 0;
  cfg->fastrd_learning_outdir_fn = NULL;

  cfg->combine_intra_cus = 1;
  cfg->force_inter = 0;
  cfg->intra_chroma_search = 0;
  cfg->fast_bipred = 1;

  cfg->enable_logging_output = 1;

  return 1;
}

int kvz_config_destroy(kvz_config *cfg)
{
  if (cfg) {
    FREE_POINTER(cfg->cqmfile);
    FREE_POINTER(cfg->roi.file_path);
    FREE_POINTER(cfg->fast_coeff_table_fn);
    FREE_POINTER(cfg->tiles_width_split);
    FREE_POINTER(cfg->tiles_height_split);
    FREE_POINTER(cfg->slice_addresses_in_ts);
    FREE_POINTER(cfg->optional_key);
    FREE_POINTER(cfg->fastrd_learning_outdir_fn);
  }
  free(cfg);

  return 1;
}

static int atobool(const char *str)
{
  if (!strcmp(str, "1")    ||
      !strcmp(str, "true") ||
      !strcmp(str, "yes"))
    return 1;
  if (!strcmp(str, "0")     ||
      !strcmp(str, "false") ||
      !strcmp(str, "no"))
    return 0;
  return 0;
}

static int parse_enum_n(const char *arg, unsigned num_chars, const char * const *names, int8_t *dst)
{
  int8_t i;
  for (i = 0; names[i]; i++) {
    if (!strncmp(arg, names[i], num_chars)) {
      *dst = i;
      return 1;
    }
  }

  return 0;
}

static int parse_enum(const char *arg, const char * const *names, int8_t *dst)
{
  return parse_enum_n(arg, 255, names, dst);
}

static int parse_tiles_specification(const char* const arg, int32_t * const ntiles, int32_t** const array) {
  const char* current_arg = NULL;
  int32_t current_value;
  int32_t values[MAX_TILES_PER_DIM];

  int i;

  //Free pointer in any case
  if (*array) {
    FREE_POINTER(*array);
  }

  //If the arg starts with u, we want an uniform split
  if (arg[0]=='u') {
    *ntiles = atoi(arg + 1);
    if (MAX_TILES_PER_DIM <= *ntiles || 1 >= *ntiles) {
      fprintf(stderr, "Invalid number of tiles (1 <= %d <= %d = MAX_TILES_PER_DIM)!\n", *ntiles, MAX_TILES_PER_DIM);
      return 0;
    }
    //Done with parsing
    return 1;
  }

  //We have a comma-separated list of int for the split...
  current_arg = arg;
  *ntiles = 1;
  do {
    int ret = sscanf(current_arg, "%d", &current_value);
    if (ret != 1) {
      fprintf(stderr, "Could not parse integer \"%s\"!\n", current_arg);
      return 0;
    }
    current_arg = strchr(current_arg, ',');
    //Skip the , if we found one
    if (current_arg) ++current_arg;
    values[*ntiles - 1] = current_value;
    ++(*ntiles);
    if (MAX_TILES_PER_DIM <= *ntiles) break;
  } while (current_arg);

  if (MAX_TILES_PER_DIM <= *ntiles || 1 >= *ntiles) {
    fprintf(stderr, "Invalid number of tiles (1 <= %d <= %d = MAX_TILES_PER_DIM)!\n", *ntiles, MAX_TILES_PER_DIM);
    return 0;
  }

  *array = MALLOC(int32_t, *ntiles - 1);
  if (!*array) {
    fprintf(stderr, "Could not allocate array for tiles\n");
    return 0;
  }

  //TODO: memcpy?
  for (i = 0; i < *ntiles - 1; ++i) {
    (*array)[i] = values[i];
  }

  return 1;
}

static int parse_uint8(const char *numstr,uint8_t* number,int min, int max)
{
  char *tail;
  int d = strtol(numstr, &tail, 10);
  if (*tail || d < min || d > max){
    fprintf(stderr, "Expected number between %d and %d\n", min, max);
    if(number)
      *number = 0;
    return 0;
  } else{
    if (number)
      *number = (uint8_t) d;
    return 1;
  }
}

static int parse_array(const char *array, uint8_t *coeff_key, int size,
                            int min, int max)
{
  char *key = strdup(array);
  const char delim[] = ",;:";
  char *token;
  int i = 0;

  token = strtok(key, delim);
  while(token!=NULL&&i<size){
    if (!parse_uint8(token, &coeff_key[i], min, max))
    {
      free(key);
      return 0;
    }
    i++;
    token = strtok(NULL, delim);
  }
  if(i>=size && (token != NULL)){
    fprintf(stderr, "parsing failed : too many members.\n");
    free(key);
    return 0;
  }
  else if (i<size){
    fprintf(stderr, "parsing failed : too few members.\n");
    free(key);
    return 0;
  }
  free(key);
  return 1;
}

static int parse_pu_depth_list( const char *array, int32_t *depths_min, int32_t *depths_max, int size )
{
    char *list = strdup( array );
    char *token;
    int i = 0;
    int ptr = -1;
    int len = strlen( list );
    int retval = 1;

    //Reset depths in case multiple pu depth parameters are given
    if(size > 1) memset( depths_max + 1, -1, (size - 1) * sizeof( *depths_max ) );
    if(size > 1) memset( depths_min + 1, -1, (size - 1) * sizeof( *depths_min ) );

    token = strtok( list, "," );
    while( ptr < len && list[ptr + 1] == ',' )
    {
        i++;
        ptr++;
    }
    while( retval && token != NULL && i < size ) {
        retval &= (sscanf( token, "%d-%d", &depths_min[i], &depths_max[i] ) == 2);
        ptr += (retval ? 4 : 0);
        i++;
        token = strtok( NULL, "," );
        while(ptr < len && list[ptr + 1] == ',' ){
          i++;
          ptr++;
        }
    }

    if( i >= size && ( token != NULL ) ) {
        fprintf( stderr, "parsing failed : too many values.\n" );
        retval = 0;
    }
    
    free( list );
    return retval;
}

static int parse_slice_specification(const char* const arg, int32_t * const nslices, int32_t** const array) {
  const char* current_arg = NULL;
  int32_t current_value;
  int32_t values[MAX_SLICES];

  int i;

  //Free pointer in any case
  if (*array) {
    FREE_POINTER(*array);
  }

  //If the arg starts with u, we want an uniform split
  if (arg[0]=='u') {
    *nslices = atoi(arg+1);
    if (MAX_SLICES <= *nslices || 0 >= *nslices) {
      fprintf(stderr, "Invalid number of tiles (0 < %d <= %d = MAX_SLICES)!\n", *nslices + 1, MAX_SLICES);
      return 0;
    }
    //Done with parsing
    return 1;
  }

  //We have a comma-separated list of int for the split...
  current_arg = arg;
  //We always have a slice starting at 0
  values[0] = 0;
  *nslices = 1;
  do {
    int ret = sscanf(current_arg, "%d", &current_value);
    if (ret != 1) {
      fprintf(stderr, "Could not parse integer \"%s\"!\n", current_arg);
      return 0;
    }
    current_arg = strchr(current_arg, ',');
    //Skip the , if we found one
    if (current_arg) ++current_arg;
    values[*nslices] = current_value;
    ++(*nslices);
    if (MAX_SLICES <= *nslices) break;
  } while (current_arg);

  if (MAX_SLICES <= *nslices || 0 >= *nslices) {
    fprintf(stderr, "Invalid number of slices (0 < %d <= %d = MAX_SLICES)!\n", *nslices, MAX_SLICES);
    return 0;
  }

  *array = MALLOC(int32_t, *nslices);
  if (!*array) {
    fprintf(stderr, "Could not allocate array for slices\n");
    return 0;
  }

  //TODO: memcpy?
  for (i = 0; i < *nslices; ++i) {
    (*array)[i] = values[i];
  }

  return 1;
}

int kvz_config_parse(kvz_config *cfg, const char *name, const char *value)
{
  static const char * const me_names[]          = { "hexbs", "tz", "full", "full8", "full16", "full32", "full64", "dia", NULL };
  static const char * const source_scan_type_names[] = { "progressive", "tff", "bff", NULL };

  static const char * const overscan_names[]    = { "undef", "show", "crop", NULL };
  static const char * const videoformat_names[] = { "component", "pal", "ntsc", "secam", "mac", "undef", NULL };
  static const char * const range_names[]       = { "tv", "pc", NULL };
  static const char * const colorprim_names[]   = { "", "bt709", "undef", "", "bt470m", "bt470bg", "smpte170m",
                                                    "smpte240m", "film", "bt2020", NULL };
  static const char * const transfer_names[]    = { "", "bt709", "undef", "", "bt470m", "bt470bg", "smpte170m",
                                                    "smpte240m", "linear", "log100", "log316", "iec61966-2-4",
                                                    "bt1361e", "iec61966-2-1", "bt2020-10", "bt2020-12", NULL };
  static const char * const colormatrix_names[] = { "GBR", "bt709", "undef", "", "fcc", "bt470bg", "smpte170m",
                                                    "smpte240m", "YCgCo", "bt2020nc", "bt2020c", NULL };
  static const char * const mv_constraint_names[] = { "none", "frame", "tile", "frametile", "frametilemargin", NULL };
  static const char * const hash_names[] = { "none", "checksum", "md5", NULL };

  static const char * const cu_split_termination_names[] = { "zero", "off", NULL };
  static const char * const crypto_toggle_names[] = { "off", "on", NULL };
  static const char * const crypto_feature_names[] = { "mvs", "mv_signs", "trans_coeffs", "trans_coeff_signs", "intra_pred_modes", NULL };

  static const char * const me_early_termination_names[] = { "off", "on", "sensitive", NULL };

  static const char * const sao_names[] = { "off", "edge", "band", "full", NULL };

  static const char * const scaling_list_names[] = { "off", "custom", "default", NULL };

  static const char * const rc_algorithm_names[] = { "no-rc", "lambda", "oba", NULL };

  static const char * const file_format_names[] = {"auto", "y4m", "yuv", NULL};

  static const char * const preset_values[11][25*2] = {
      {
        "ultrafast",
        "rd", "0",
        "pu-depth-intra", "2-3",
        "pu-depth-inter", "1-2",
        "me", "hexbs",
        "gop", "8",
        "ref", "1",
        "bipred", "1",
        "deblock", "0:0",
        "signhide", "0",
        "subme", "0",
        "sao", "off",
        "rdoq", "0",
        "rdoq-skip", "0",
        "transform-skip", "0",
        "mv-rdo", "0",
        "full-intra-search", "0",
        "smp", "0",
        "amp", "0",
        "cu-split-termination", "zero",
        "me-early-termination", "sensitive",
        "intra-rdo-et", "0",
        "early-skip", "1",
        "fast-residual-cost", "28",
        "max-merge", "5",
        NULL
      },
      {
        "superfast",
        "rd", "0",
        "pu-depth-intra", "2-3",
        "pu-depth-inter", "1-2",
        "me", "hexbs",
        "gop", "8",
        "ref", "1",
        "bipred", "1",
        "deblock", "0:0",
        "signhide", "0",
        "subme", "2",
        "sao", "full",
        "rdoq", "0",
        "rdoq-skip", "0",
        "transform-skip", "0",
        "mv-rdo", "0",
        "full-intra-search", "0",
        "smp", "0",
        "amp", "0",
        "cu-split-termination", "zero",
        "me-early-termination", "sensitive",
        "intra-rdo-et", "0",
        "early-skip", "1",
        "fast-residual-cost", "28",
        "max-merge", "5",
        NULL
      },
      {
        "veryfast",
        "rd", "0",
        "pu-depth-intra", "2-3",
        "pu-depth-inter", "1-3",
        "me", "hexbs",
        "gop", "8",
        "ref", "1",
        "bipred", "1",
        "deblock", "0:0",
        "signhide", "0",
        "subme", "2",
        "sao", "full",
        "rdoq", "0",
        "rdoq-skip", "0",
        "transform-skip", "0",
        "mv-rdo", "0",
        "full-intra-search", "0",
        "smp", "0",
        "amp", "0",
        "cu-split-termination", "zero",
        "me-early-termination", "sensitive",
        "intra-rdo-et", "0",
        "early-skip", "1",
        "fast-residual-cost", "28",
        "max-merge", "5",
        NULL
      },
      {
        "faster",
        "rd", "0",
        "pu-depth-intra", "2-3",
        "pu-depth-inter", "1-3",
        "me", "hexbs",
        "gop", "8",
        "ref", "1",
        "bipred", "1",
        "deblock", "0:0",
        "signhide", "0",
        "subme", "4",
        "sao", "full",
        "rdoq", "0",
        "rdoq-skip", "0",
        "transform-skip", "0",
        "mv-rdo", "0",
        "full-intra-search", "0",
        "smp", "0",
        "amp", "0",
        "cu-split-termination", "zero",
        "me-early-termination", "sensitive",
        "intra-rdo-et", "0",
        "early-skip", "1",
        "fast-residual-cost", "0",
        "max-merge", "5",
        NULL
      },
      {
        "fast",
        "rd", "0",
        "pu-depth-intra", "1-3",
        "pu-depth-inter", "1-3",
        "me", "hexbs",
        "gop", "8",
        "ref", "2",
        "bipred", "1",
        "deblock", "0:0",
        "signhide", "0",
        "subme", "4",
        "sao", "full",
        "rdoq", "0",
        "rdoq-skip", "0",
        "transform-skip", "0",
        "mv-rdo", "0",
        "full-intra-search", "0",
        "smp", "0",
        "amp", "0",
        "cu-split-termination", "zero",
        "me-early-termination", "sensitive",
        "intra-rdo-et", "0",
        "early-skip", "1",
        "fast-residual-cost", "0",
        "max-merge", "5",
        NULL
      },
      {
        "medium",
        "rd", "0",
        "pu-depth-intra", "1-4",
        "pu-depth-inter", "0-3",
        "me", "hexbs",
        "gop", "16",
        "ref", "4",
        "bipred", "1",
        "deblock", "0:0",
        "signhide", "0",
        "subme", "4",
        "sao", "full",
        "rdoq", "1",
        "rdoq-skip", "0",
        "transform-skip", "0",
        "mv-rdo", "0",
        "full-intra-search", "0",
        "smp", "0",
        "amp", "0",
        "cu-split-termination", "zero",
        "me-early-termination", "on",
        "intra-rdo-et", "0",
        "early-skip", "1",
        "fast-residual-cost", "0",
        "max-merge", "5",
        NULL
      },
      {
        "slow",
        "rd", "1",
        "pu-depth-intra", "1-4",
        "pu-depth-inter", "0-3",
        "me", "hexbs",
        "gop", "16",
        "ref", "4",
        "bipred", "1",
        "deblock", "0:0",
        "signhide", "0",
        "subme", "4",
        "sao", "full",
        "rdoq", "1",
        "rdoq-skip", "0",
        "transform-skip", "0",
        "mv-rdo", "0",
        "full-intra-search", "0",
        "smp", "0",
        "amp", "0",
        "cu-split-termination", "zero",
        "me-early-termination", "on",
        "intra-rdo-et", "0",
        "early-skip", "1",
        "fast-residual-cost", "0",
        "max-merge", "5",
        NULL
      },
      {
        "slower",
        "rd", "2",
        "pu-depth-intra", "1-4",
        "pu-depth-inter", "0-3",
        "me", "hexbs",
        "gop", "16",
        "ref", "4",
        "bipred", "1",
        "deblock", "0:0",
        "signhide", "1",
        "subme", "4",
        "sao", "full",
        "rdoq", "1",
        "rdoq-skip", "0",
        "transform-skip", "0",
        "mv-rdo", "0",
        "full-intra-search", "0",
        "smp", "0",
        "amp", "0",
        "cu-split-termination", "zero",
        "me-early-termination", "off",
        "intra-rdo-et", "0",
        "early-skip", "1",
        "fast-residual-cost", "0",
        "max-merge", "5",
        NULL
      },
      {
        "veryslow",
        "rd", "3",
        "pu-depth-intra", "1-4",
        "pu-depth-inter", "0-3",
        "me", "tz",
        "gop", "16",
        "ref", "4",
        "bipred", "1",
        "deblock", "0:0",
        "signhide", "1",
        "subme", "4",
        "sao", "full",
        "rdoq", "1",
        "rdoq-skip", "0",
        "transform-skip", "1",
        "mv-rdo", "0",
        "full-intra-search", "0",
        "smp", "1",
        "amp", "0",
        "cu-split-termination", "zero",
        "me-early-termination", "off",
        "intra-rdo-et", "0",
        "early-skip", "1",
        "fast-residual-cost", "0",
        "max-merge", "5",
        NULL
      },
      {
        "placebo",
        "rd", "3",
        "pu-depth-intra", "1-4",
        "pu-depth-inter", "0-3",
        "me", "tz",
        "gop", "16",
        "ref", "4",
        "bipred", "1",
        "deblock", "0:0",
        "signhide", "1",
        "subme", "4",
        "sao", "full",
        "rdoq", "1",
        "rdoq-skip", "0",
        "transform-skip", "1",
        "mv-rdo", "1",
        "full-intra-search", "0",
        "smp", "1",
        "amp", "1",
        "cu-split-termination", "off",
        "me-early-termination", "off",
        "intra-rdo-et", "0",
        "early-skip", "0",
        "fast-residual-cost", "0",
        "max-merge", "5",
        NULL
      },
      { NULL }
  };

  if (!name)
    return 0;

  if (!value)
    value = "true";

  // Treat "--no-param" as --param 0
  if ((!strncmp(name, "no-", 3))) {
    name += 3;
    value = atobool(value) ? "false" : "true";
  }

#define OPT(STR) (!strcmp(name, STR))
  if OPT("width")
    cfg->width = atoi(value);
  else if OPT("height")
    cfg->height = atoi(value);
  else if OPT("input-res")
    if (!strcmp(value, "auto")) {
      return 1;
    } else {
      return (sscanf(value, "%dx%d", &cfg->width, &cfg->height) == 2);
    }
  else if OPT("input-fps") {
    int32_t fps_num, fps_denom;
    if (sscanf(value, "%d/%d", &fps_num, &fps_denom) == 2) {
      cfg->framerate_num = fps_num;
      cfg->framerate_denom = fps_denom;
    } else {
      // Accept decimal notation, making sure not to round 0 to 1.
      cfg->framerate_num = (int)(atof(value) * 1000 + 0.49);
      cfg->framerate_denom = 1000;
    }
  }
  else if OPT("qp")
    cfg->qp = atoi(value);
  else if OPT("period")
    cfg->intra_period = atoi(value);
  else if OPT("vps-period")
    cfg->vps_period = atoi(value);
  else if OPT("ref")
    cfg->ref_frames = atoi(value);
  else if OPT("deblock") {
    int beta, tc;
    if (2 == sscanf(value, "%d:%d", &beta, &tc)) {
      cfg->deblock_enable = 1;
      cfg->deblock_beta   = beta;
      cfg->deblock_tc     = tc;
    } else {
      cfg->deblock_enable = atobool(value);
    }
  }
  else if OPT("sao") {
    int8_t sao_type = 0;
    if (!parse_enum(value, sao_names, &sao_type)) sao_type = atobool(value) ? 3 : 0;
    cfg->sao_type = sao_type;
  }
  else if OPT("rdoq")
    cfg->rdoq_enable = atobool(value);
  else if OPT("signhide")
    cfg->signhide_enable = (bool)atobool(value);
  else if OPT("smp")
    cfg->smp_enable = (bool)atobool(value);
  else if OPT("amp")
    cfg->amp_enable = (bool)atobool(value);
  else if OPT("rd")
    cfg->rdo = atoi(value);
  else if OPT("full-intra-search")
    cfg->full_intra_search = atobool(value);
  else if OPT("transform-skip")
    cfg->trskip_enable = atobool(value);
  else if OPT("tr-depth-intra")
    cfg->tr_depth_intra = atoi(value);
  else if OPT("me") {
    int8_t ime_algorithm = 0;
    if (!parse_enum(value, me_names, &ime_algorithm)) return 0;
    cfg->ime_algorithm = ime_algorithm;
  }
  else if OPT("subme")
    cfg->fme_level = atoi(value);
  else if OPT("source-scan-type")
    return parse_enum(value, source_scan_type_names, &cfg->source_scan_type);
  else if OPT("mv-constraint")
  {
    int8_t constraint = KVZ_MV_CONSTRAIN_NONE;
    int result = parse_enum(value, mv_constraint_names, &constraint);
    cfg->mv_constraint = constraint;
    return result;
  }
  else if OPT("sar")
    return sscanf(value, "%d:%d", &cfg->vui.sar_width, &cfg->vui.sar_height) == 2;
  else if OPT("overscan")
    return parse_enum(value, overscan_names, &cfg->vui.overscan);
  else if OPT("videoformat")
    return parse_enum(value, videoformat_names, &cfg->vui.videoformat);
  else if OPT("range")
    return parse_enum(value, range_names, &cfg->vui.fullrange);
  else if OPT("colorprim")
    return parse_enum(value, colorprim_names, &cfg->vui.colorprim);
  else if OPT("transfer")
    return parse_enum(value, transfer_names, &cfg->vui.transfer);
  else if OPT("colormatrix")
    return parse_enum(value, colormatrix_names, &cfg->vui.colormatrix);
  else if OPT("chromaloc")
    cfg->vui.chroma_loc = atoi(value);
  else if OPT("aud")
    cfg->aud_enable = atobool(value);
  else if OPT("cqmfile") {
    char* cqmfile = strdup(value);
    if (!cqmfile) {
      fprintf(stderr, "Failed to allocate memory for CQM file name.\n");
      return 0;
    }
    FREE_POINTER(cfg->cqmfile);
    cfg->cqmfile = cqmfile;
    cfg->scaling_list = KVZ_SCALING_LIST_CUSTOM;
  }
  else if OPT("fast-coeff-table") {
    char* fast_coeff_table_fn = strdup(value);
    if (!fast_coeff_table_fn) {
      fprintf(stderr, "Failed to allocate memory for fast coeff table file name.\n");
      return 0;
    }
    FREE_POINTER(cfg->fast_coeff_table_fn);
    cfg->fast_coeff_table_fn = fast_coeff_table_fn;
  }
  else if OPT("fastrd-sampling") {
    cfg->fastrd_sampling_on = 1;
  }
  else if OPT("fastrd-accuracy-check") {
    cfg->fastrd_accuracy_check_on = 1;
  }
  else if OPT("fastrd-outdir") {
    char *fastrd_learning_outdir_fn = strdup(value);
    if (!fastrd_learning_outdir_fn) {
      fprintf(stderr, "Failed to allocate memory for fast RD learning outfile name.\n");
      return 0;
    }
    FREE_POINTER(cfg->fastrd_learning_outdir_fn);
    cfg->fastrd_learning_outdir_fn = fastrd_learning_outdir_fn;
  }
  else if OPT("scaling-list") {    
    int8_t scaling_list = KVZ_SCALING_LIST_OFF;
    int result = parse_enum(value, scaling_list_names, &scaling_list);
    cfg->scaling_list = scaling_list;
    return result;
  }
  else if OPT("tiles-width-split") {
    int retval = parse_tiles_specification(value, &cfg->tiles_width_count, &cfg->tiles_width_split);

    if (cfg->tiles_width_count > 1 && cfg->tmvp_enable) {
      cfg->tmvp_enable = false;
      fprintf(stderr, "Disabling TMVP because tiles are used.\n");
    }

    if (cfg->wpp) {
      cfg->wpp = false;
      fprintf(stderr, "Disabling WPP because tiles were enabled.\n");
    }

    return retval;
  }
  else if OPT("tiles-height-split") {
    int retval = parse_tiles_specification(value, &cfg->tiles_height_count, &cfg->tiles_height_split);

    if (cfg->tiles_height_count > 1 && cfg->tmvp_enable) {
      cfg->tmvp_enable = false;
      fprintf(stderr, "Disabling TMVP because tiles are used.\n");
    }

    if (cfg->wpp) {
      cfg->wpp = false;
      fprintf(stderr, "Disabling WPP because tiles were enabled.\n");
    }

    return retval;
  }
  else if OPT("tiles")
  {
    // A simpler interface for setting tiles, accepting only uniform split.
    unsigned width;
    unsigned height;
    if (2 != sscanf(value, "%ux%u", &width, &height)) {
      fprintf(stderr, "Wrong format for tiles. Expected \"%%ux%%u\", but got \"%s\"\n", value);
      return 0;
    }

    if (MAX_TILES_PER_DIM <= width || 1 > width) {
      fprintf(stderr, "Invalid number of tiles (0 < %d <= %d = MAX_TILES_PER_DIM)!\n", width, MAX_TILES_PER_DIM);
      return 0;
    }
    if (MAX_TILES_PER_DIM <= height || 1 > height) {
      fprintf(stderr, "Invalid number of tiles (0 < %d <= %d = MAX_TILES_PER_DIM)!\n", height, MAX_TILES_PER_DIM);
      return 0;
    }

    // Free split arrays incase they have already been set by another parameter.
    FREE_POINTER(cfg->tiles_width_split);
    FREE_POINTER(cfg->tiles_height_split);
    cfg->tiles_width_count = width;
    cfg->tiles_height_count = height;

    if (cfg->tmvp_enable) {
      cfg->tmvp_enable = false;
      fprintf(stderr, "Disabling TMVP because tiles are used.\n");
    }

    if (cfg->wpp) {
      cfg->wpp = false;
      fprintf(stderr, "Disabling WPP because tiles were enabled.\n");
    }

    return 1;
  }
  else if OPT("wpp")
    cfg->wpp = atobool(value);
  else if OPT("owf") {
    cfg->owf = atoi(value);
    if (cfg->owf == 0 && !strcmp(value, "auto")) {
      // -1 means automatic selection
      cfg->owf = -1;
    }
  } else if OPT("slices") {
    if (!strcmp(value, "tiles")) {
      cfg->slices = KVZ_SLICES_TILES;
      return 1;
    } else if (!strcmp(value, "wpp")) {
      cfg->slices = KVZ_SLICES_WPP;
      return 1;
    } else if (!strcmp(value, "tiles+wpp")) {
      cfg->slices = KVZ_SLICES_TILES | KVZ_SLICES_WPP;
      return 1;
    } else {
      return parse_slice_specification(value, &cfg->slice_count, &cfg->slice_addresses_in_ts);
    }

  } else if OPT("threads") {
    cfg->threads = atoi(value);
    if (cfg->threads == 0 && !strcmp(value, "auto")) {
      // -1 means automatic selection
      cfg->threads = -1;
    }
  }
  else if OPT("cpuid")
    cfg->cpuid = atobool(value);
  else if OPT("pu-depth-inter")
    return parse_pu_depth_list(value, cfg->pu_depth_inter.min, cfg->pu_depth_inter.max, KVZ_MAX_GOP_LAYERS);
  else if OPT("pu-depth-intra")
    return parse_pu_depth_list(value, cfg->pu_depth_intra.min, cfg->pu_depth_intra.max, KVZ_MAX_GOP_LAYERS);
  else if OPT("info")
    cfg->add_encoder_info = atobool(value);
  else if OPT("gop") {
    if (!strncmp(value, "lp-", 3)) {  // Handle GOPs starting with "lp-".
      struct {
        unsigned g;  // length
        unsigned d;  // depth
        unsigned t;  // temporal
      } gop = { 0, 0, 0 };

      // Parse --gop=lp-g#d#t#
      if (sscanf(value, "lp-g%ud%ut%u", &gop.g, &gop.d, &gop.t) != 3) {
        fprintf(stderr, "Error in GOP syntax. Example: lp-g8d4t2\n");
        return 0;
      }

      if (gop.g < 1 || gop.g > 32) {
        fprintf(stderr, "gop.g must be between 1 and 32.\n");
        return 0;
      }
      if (gop.d < 1 || gop.d > 8) {
        fprintf(stderr, "gop.d must be between 1 and 8.\n");
        return 0;
      }
      if (gop.t < 1 || gop.t > 15) {
        fprintf(stderr, "gop.t must be between 1 and 15.\n");
        return 0;
      }

      cfg->gop_lowdelay = true;
      cfg->gop_len = gop.g;
      cfg->gop_lp_definition.d = gop.d;
      cfg->gop_lp_definition.t = gop.t;

      cfg->intra_bit_allocation = true;
      cfg->clip_neighbour = false;
    } else if (atoi(value) == 8) {
      cfg->gop_lowdelay = 0;
      cfg->gop_len = sizeof(kvz_gop_ra8) / sizeof(kvz_gop_ra8[0]);
      memcpy(cfg->gop, kvz_gop_ra8, sizeof(kvz_gop_ra8));
      cfg->intra_bit_allocation = false;
      cfg->clip_neighbour = true;

    } else if (atoi(value) == 16) {
      cfg->gop_lowdelay = 0;
      cfg->gop_len = sizeof(kvz_gop_ra16) / sizeof(kvz_gop_ra16[0]);
      memcpy(cfg->gop, kvz_gop_ra16, sizeof(kvz_gop_ra16));
      cfg->intra_bit_allocation = false;
      cfg->clip_neighbour = true;

    } else if (atoi(value) == 0) {
      //Disable gop
      cfg->gop_len = 0;
      cfg->gop_lowdelay = 0;
      cfg->gop_lp_definition.d = 0;
      cfg->gop_lp_definition.t = 0;
    } else if (atoi(value)) {
      fprintf(stderr, "Input error: unsupported gop length, must be 0 or 8\n");
      return 0;
    }
  }
  else if OPT("intra-qp-offset") {
    cfg->intra_qp_offset = atoi(value);
    if( cfg->intra_qp_offset == 0 && !strcmp( value, "auto" ) )
    {
        cfg->intra_qp_offset_auto = true;
    } else {
        cfg->intra_qp_offset_auto = false;
    }
  }
  else if OPT("open-gop") {
    cfg->open_gop = (bool)atobool(value);
  }
  else if OPT("bipred")
    cfg->bipred = atobool(value);
  else if OPT("bitrate") {
    cfg->target_bitrate = atoi(value);
    if (!cfg->rc_algorithm) {
      cfg->rc_algorithm = KVZ_LAMBDA;
    }
  }
  else if OPT("preset") {
    int preset_line = 0;

    // Accept numbers from 0 to 9.
    if ((atoi(value) == 0 && !strcmp(value, "0")) || (atoi(value) >= 1 && atoi(value) <= 9)) {
      preset_line = atoi(value);
    } else {
      // Find the selected preset from the list
      while (preset_values[preset_line][0] != NULL) {
        if (!strcmp(value, preset_values[preset_line][0])) {
          break;
        }
        preset_line++;
      }
    }

    if (preset_values[preset_line][0] != NULL) {
      fprintf(stderr, "Using preset %s: ", value);
      // Loop all the name and value pairs and push to the config parser
      for (int preset_value = 1; preset_values[preset_line][preset_value] != NULL; preset_value += 2) {
        fprintf(stderr, "--%s=%s ", preset_values[preset_line][preset_value], preset_values[preset_line][preset_value + 1]);
        kvz_config_parse(cfg, preset_values[preset_line][preset_value], preset_values[preset_line][preset_value + 1]);
      }
      fprintf(stderr, "\n");
    } else {
      fprintf(stderr, "Input error: unknown preset \"%s\"\n", value);
      return 0;
    }
  }
  else if OPT("mv-rdo")
    cfg->mv_rdo = atobool(value);
  else if OPT("psnr")
    cfg->calc_psnr = (bool)atobool(value);
  else if OPT("hash")
  {
    int8_t hash;
    int result;
    if ((result = parse_enum(value, hash_names, &hash))) {
      cfg->hash = hash;
    }
    return result;
  }
  else if OPT("cu-split-termination")
  {
    int8_t mode = KVZ_CU_SPLIT_TERMINATION_ZERO;
    int result = parse_enum(value, cu_split_termination_names, &mode);
    cfg->cu_split_termination = mode;
    return result;
  }
  else if OPT("crypto")
  {
    // on, off, feature1+feature2

    const char *token_begin = value;
    const char *cur = token_begin;

    cfg->crypto_features = KVZ_CRYPTO_OFF;

    // If value is on or off, set all features to on or off.
    int8_t toggle = 0;
    if (parse_enum(token_begin, crypto_toggle_names, &toggle)) {
      if (toggle == 1) {
        cfg->crypto_features = KVZ_CRYPTO_ON;
      }
    } else {
      // Try and parse "feature1+feature2" type list.
      for (;;) {
        if (*cur == '+' || *cur == '\0') {
          int8_t feature = 0;
          int num_chars = cur - token_begin;
          if (parse_enum_n(token_begin, num_chars, crypto_feature_names, &feature)) {
            cfg->crypto_features |= (1 << feature);
          } else {
            cfg->crypto_features = KVZ_CRYPTO_OFF;
            return 0;
          }
          token_begin = cur + 1;
        }

        if (*cur == '\0') {
          break;
        } else {
          ++cur;
        }
      }
    }

    // Disallow turning on the encryption when it's not compiled in.
    bool encryption_compiled_in = false;
#ifdef KVZ_SEL_ENCRYPTION
    encryption_compiled_in = true;
#endif
    if (!encryption_compiled_in && cfg->crypto_features) {
      fprintf(stderr, "--crypto cannot be enabled because it's not compiled in.\n");
      cfg->crypto_features = KVZ_CRYPTO_OFF;
      return 0;
    }

    return 1;
  }
  else if OPT("key"){
    int size_key = 16;
    FREE_POINTER(cfg->optional_key);
    cfg->optional_key = (uint8_t *)malloc(sizeof(uint8_t)*size_key);
    return parse_array(value, cfg->optional_key, size_key, 0, 255);
  }
  else if OPT("me-early-termination"){
    int8_t mode = 0;
    int result = parse_enum(value, me_early_termination_names, &mode);
    cfg->me_early_termination = mode;
    return result;
  }
  else if OPT("intra-rdo-et")
    cfg->intra_rdo_et = (bool)atobool(value);
  else if OPT("lossless")
    cfg->lossless = (bool)atobool(value);
  else if OPT("tmvp") {
    cfg->tmvp_enable = atobool(value);
    if (cfg->tiles_width_count > 1 || cfg->tiles_height_count > 1) {
      fprintf(stderr, "Cannot enable TMVP because tiles are used.\n");
      cfg->tmvp_enable = false;
    }
  }
  else if OPT("rdoq-skip"){
    cfg->rdoq_skip = atobool(value);
  }
  else if OPT("input-format") {
    static enum kvz_input_format const formats[] = { KVZ_FORMAT_P400, KVZ_FORMAT_P420 };
    static const char * const format_names[] = { "P400", "P420", NULL };

    int8_t format = 0;
    if (!parse_enum(value, format_names, &format)) {
      fprintf(stderr, "input-format not recognized.\n");
      return 0;
    }

    cfg->input_format = formats[format];
  }
  else if OPT("input-bitdepth") {
    cfg->input_bitdepth = atoi(value);
    if (cfg->input_bitdepth < 8 || cfg->input_bitdepth > 16) {
      fprintf(stderr, "input-bitdepth not between 8 and 16.\n");
      return 0;
    }
    if (cfg->input_bitdepth > 8 && KVZ_BIT_DEPTH == 8) {
      // Because the image is read straight into the reference buffers,
      // reading >8 bit samples doesn't work when sizeof(kvz_pixel)==1.
      fprintf(stderr, "input-bitdepth can't be set to larger than 8 because"
                      " Kvazaar is compiled with KVZ_BIT_DEPTH=8.\n");
      return 0;
    }
  }
  else if OPT("implicit-rdpcm")
    cfg->implicit_rdpcm = (bool)atobool(value);

  else if OPT("roi") {
    static enum kvz_roi_format const formats[] = { KVZ_ROI_TXT, KVZ_ROI_BIN };
    static const char * const format_names[] = { "txt", "bin", NULL };

    char *roi_file = strdup(value);
    if (!roi_file) {
      fprintf(stderr, "Failed to allocate memory for ROI file name.\n");
      return 0;
    }
    FREE_POINTER(cfg->roi.file_path);
    cfg->roi.file_path = roi_file;

    // Get file extension or the substring after the last dot
    char *maybe_extension = strrchr(cfg->roi.file_path, '.');
    if (!maybe_extension) {
      cfg->roi.format = KVZ_ROI_TXT;
    } else {
      maybe_extension++;
      int8_t format;
      bool unknown_format = !parse_enum(maybe_extension, format_names, &format);
      cfg->roi.format = unknown_format ? KVZ_ROI_TXT : formats[format];
    }
  }
  else if OPT("set-qp-in-cu") {
    cfg->set_qp_in_cu = (bool)atobool(value);
  }
  else if OPT("erp-aqp") {
    cfg->erp_aqp = (bool)atobool(value);
  }
  else if (OPT("level") || OPT("force-level")) {
    if OPT("force-level") {
      cfg->force_level = true;
    } else {
      cfg->force_level = false;
    }

    unsigned int num_first, num_second, level;
    int matched_amount = sscanf(value, "%u.%u", &num_first, &num_second);

    if (matched_amount == 2) {
      // of form x.y
      level = num_first * 10 + num_second;
    } else if (matched_amount == 1) {
      // no dot
      if (num_first < 10) {
        // of form x
        level = num_first * 10;
      } else {
        // of form xx
        level = num_first;
      }
    } else {
      fprintf(stderr, "Invalid level value: \"%s\"\n", value);
      return 0;
    }
    if (level < 10 || level > 62) {
      fprintf(stderr, "Level value of %s is out of bounds\n", value);
      return 0;
    }

    cfg->level = level;
  }
  else if (OPT("high-tier")) {
    cfg->high_tier = true;
  }
  else if (OPT("me-steps")) {
    char * tailptr = NULL;
    long steps = strtol(value, &tailptr, 0);

    if (*tailptr != '\0') {
      fprintf(stderr, "Invalid me-steps value: \"%s\"", value);
      return 0;
    }
    if (steps < -1 || steps > UINT32_MAX) {
      fprintf(stderr, "me-steps value is out of bounds: \"%s\"", value);
      return 0;
    }

    cfg->me_max_steps = (uint32_t)steps;
  }
  else if (OPT("fast-residual-cost"))
    cfg->fast_residual_cost_limit = atoi(value);
  else if (OPT("vaq")) {
    cfg->vaq = (int)atoi(value);
  }
  else if (OPT("max-merge")) {
    int max_merge = atoi(value);
    if (max_merge < 1 || max_merge > 5) {
      fprintf(stderr, "max-merge needs to be between 1 and 5\n");
      return 0;
    }
    cfg->max_merge = (uint8_t)max_merge;
  }
  else if OPT("early-skip") {
    cfg->early_skip = (bool)atobool(value);
  }
  else if OPT("ml-pu-depth-intra") {
    cfg->ml_pu_depth_intra = (bool)atobool(value);
  }
  else if OPT("partial-coding") {
    uint32_t firstCTU_x;
    uint32_t firstCTU_y;
    uint32_t fullWidth;
    uint32_t fullHeight;
    if (4 != sscanf(value, "%u!%u!%u!%u", &firstCTU_x,
      &firstCTU_y, &fullWidth, &fullHeight)) {
      fprintf(stderr, "invalid partial-coding options. Expected \"%%u!%%u!%%u!%%u\", but got \"%s\"\n", value);
      return 0;
    }
    cfg->partial_coding.startCTU_x = firstCTU_x;
    cfg->partial_coding.startCTU_y = firstCTU_y;
    cfg->partial_coding.fullWidth = fullWidth;
    cfg->partial_coding.fullHeight = fullHeight;
  }
  else if OPT("zero-coeff-rdo") {
  cfg->zero_coeff_rdo = (bool)atobool(value);
  }
  else if OPT("rc-algorithm") {
    int8_t rc_algorithm = 0;
    if (!parse_enum(value, rc_algorithm_names, &rc_algorithm)) {
      fprintf(stderr, "Invalid rate control algorithm %s. Valid values include %s, %s, and %s\n", value, 
        rc_algorithm_names[0],
        rc_algorithm_names[1],
        rc_algorithm_names[2]);
      return 0;
    }
    cfg->rc_algorithm = rc_algorithm;
  }
  else if OPT("intra-bits") {
    cfg->intra_bit_allocation = atobool(value);
  }
  else if OPT("clip-neighbour") {
    cfg->clip_neighbour = atobool(value);
  }
  else if OPT("input-file-format") {
    int8_t file_format = 0;
    if (!parse_enum(value, file_format_names, &file_format)) {
      fprintf(stderr, "Invalid input file format %s. Valid values include %s, %s, and %s\n", value,
        file_format_names[0],
        file_format_names[1], 
        file_format_names[2]);
      return 0;
    }
    cfg->file_format = file_format;
  }
  else if OPT("stats-file-prefix") {
    cfg->stats_file_prefix = strdup(value);
  }
  else if OPT("combine-intra-cus") {
    cfg->combine_intra_cus = atobool(value);
  }
  else if OPT("force-inter") {
    cfg->force_inter = atobool(value);
  }
  else if OPT("intra-chroma-search") {
    cfg->intra_chroma_search = atobool(value);
  }
  else if OPT("fast-bipred") {
    cfg->fast_bipred = atobool(value);
  }
  else if OPT("enable-logging") {
    cfg->enable_logging_output = atobool(value);
  }
  else {
    return 0;
  }
#undef OPT

  return 1;
}

void kvz_config_process_lp_gop(kvz_config *cfg)
{
  struct {
    unsigned g;
    unsigned d;
    unsigned t;
  } gop;

  gop.g = cfg->gop_len;
  gop.d = cfg->gop_lp_definition.d;
  gop.t = cfg->gop_lp_definition.t;

  // Initialize modulos for testing depth.
  // The picture belong to the lowest depth in which (poc % modulo) == 0.
  unsigned depth_modulos[8] = { 0 };
  for (int d = 0; d < gop.d; ++d) {
    depth_modulos[gop.d - 1 - d] = 1 << d;
  }
  depth_modulos[0] = gop.g;

  cfg->gop_lowdelay = 1;
  cfg->gop_len = gop.g;
  for (int g = 1; g <= gop.g; ++g) {
    kvz_gop_config *gop_pic = &cfg->gop[g - 1];

    // Find gop depth for picture.
    int gop_layer = 1;
    while (gop_layer < gop.d && (g % depth_modulos[gop_layer - 1])) {
      ++gop_layer;
    }

    gop_pic->poc_offset = g;
    gop_pic->layer = gop_layer;
    gop_pic->qp_offset = gop_layer;
    gop_pic->ref_pos_count = 0;
    gop_pic->ref_neg_count = cfg->ref_frames;
    gop_pic->is_ref = 0;

    // Set first ref to point to previous frame, and the rest to previous
    // key-frames.
    // If gop.t > 1, have (poc % gop.t) == 0 point gop.t frames away,
    // instead of the previous frame. Set the frames in between to
    // point to the nearest frame with a lower gop-depth.
    if (gop.t > 1) {
      if (gop_pic->poc_offset % gop.t == 0) {
        gop_pic->ref_neg[0] = gop.t;
      } else {
        int r = gop_pic->poc_offset - 1;
        while (r > 0) {
          if (cfg->gop[r].layer < gop_pic->layer) break;
          --r;
        }
        // Var r is now 0 or index of the pic with layer < depth.
        if (cfg->gop[r].layer < gop_pic->layer) {
          gop_pic->ref_neg[0] = gop_pic->poc_offset - cfg->gop[r].poc_offset;
          cfg->gop[r].is_ref = 1;
        } else {
          // No ref was found, just refer to the previous key-frame.
          gop_pic->ref_neg[0] = gop_pic->poc_offset % gop.g;
        }
      }
    } else {
      gop_pic->ref_neg[0] = 1;
      if (gop_pic->poc_offset >= 2) {
        cfg->gop[gop_pic->poc_offset - 2].is_ref = 1;
      }
    }

    int keyframe = gop_pic->poc_offset;
    for (int i = 1; i < gop_pic->ref_neg_count; ++i) {
      while (keyframe == gop_pic->ref_neg[i - 1]) {
        keyframe += gop.g;
      }
      gop_pic->ref_neg[i] = keyframe;
    }

    gop_pic->qp_factor = 0.4624;  // from HM
  }

  for (int g = 0; g < gop.g; ++g) {
    kvz_gop_config *gop_pic = &cfg->gop[g];
    if (!gop_pic->is_ref) {
      gop_pic->qp_factor = 0.68 * 1.31;  // derived from HM
    }
  }

  // Key-frame is always a reference.
  cfg->gop[gop.g - 1].is_ref = 1;
  cfg->gop[gop.g - 1].qp_factor = 0.578;  // from HM
}

// forward declaration
static int validate_hevc_level(kvz_config *const cfg);

/**
 * \brief Check that configuration is sensible.
 *
 * \param cfg   config to check
 * \return      1 if the config is ok, otherwise 1
 */
int kvz_config_validate(const kvz_config *const cfg)
{
  int error = 0;

  if (cfg->vaq < 0) {
    fprintf(stderr, "vaq strength must be positive\n");
    error = 1;
  }

  if (cfg->width <= 0) {
    fprintf(stderr, "Input error: width must be positive\n");
    error = 1;
  }

  if (cfg->height <= 0) {
    fprintf(stderr, "Input error: height must be positive\n");
    error = 1;
  }

  if (cfg->width % 2 != 0) {
    fprintf(stderr, "Input error: width must be a multiple of two\n");
    error = 1;
  }

  if (cfg->height % 2 != 0) {
    fprintf(stderr, "Input error: height must be a multiple of two\n");
    error = 1;
  }

  if (cfg->width > 0 && cfg->height > 0) {
    // We must be able to store the total number of luma and chroma pixels
    // in an int32_t. For 4:4:4 chroma mode, the number of pixels is
    // 3 * width * height. Width and height are rounded up to a multiple of
    // LCU size.
    const uint32_t max_lcus = INT_MAX / (3 * LCU_WIDTH * LCU_WIDTH);
    const uint64_t num_lcus = CEILDIV((uint64_t)cfg->width,  LCU_WIDTH) *
                              CEILDIV((uint64_t)cfg->height, LCU_WIDTH);
    if (num_lcus > max_lcus) {
      fprintf(stderr, "Input error: resolution %dx%d too large (max %u CTUs)\n",
              cfg->width, cfg->height, max_lcus);
      error = 1;
    }
  }

  if (cfg->framerate < 0.0) {
    fprintf(stderr, "Input error: --input-fps must be positive\n");
    error = 1;
  }
  if (cfg->framerate_num < 0) {
    fprintf(stderr, "Input error: --input-fps must >=0\n");
    error = 1;
  }
  if (cfg->framerate_denom <= 0) {
    fprintf(stderr, "Input error: --input-fps denominator must be >0\n");
    error = 1;
  }

  if (cfg->gop_len &&
      cfg->intra_period > 1 &&
      !cfg->gop_lowdelay &&
      cfg->intra_period % cfg->gop_len != 0)
  {
    fprintf(stderr,
            "Input error: intra period (%d) not a multiple of B-gop length (%d)\n",
            cfg->intra_period,
            cfg->gop_len);
    error = 1;
  }

  if (cfg->ref_frames  < 1 || cfg->ref_frames >= MAX_REF_PIC_COUNT) {
    fprintf(stderr, "Input error: --ref out of range [1..%d]\n", MAX_REF_PIC_COUNT - 1);
    error = 1;
  }

  if (cfg->deblock_beta  < -6 || cfg->deblock_beta  > 6) {
    fprintf(stderr, "Input error: deblock beta parameter out of range [-6..6]\n");
    error = 1;
  }
  if (cfg->deblock_tc < -6 || cfg->deblock_tc > 6) {
    fprintf(stderr, "Input error: deblock tc parameter out of range [-6..6]\n");
    error = 1;
  }

  if (cfg->rdo < 0 || cfg->rdo > 6) {
    fprintf(stderr, "Input error: --rd parameter out of range [0..5]\n");
    error = 1;
  }

  if (cfg->tr_depth_intra < 0 || cfg->tr_depth_intra > 4) {
    // range is 0 .. CtbLog2SizeY - Log2MinTrafoSize
    fprintf(stderr, "Input error: --tr-depth-intra is out of range [0..4]\n");
    error = 1;
  }

  if (cfg->fme_level != 0 && cfg->fme_level > 4) {
    fprintf(stderr, "Input error: invalid --subme parameter (must be in range 0-4)\n");
    error = 1;
  }

  if (cfg->vui.chroma_loc < 0 || cfg->vui.chroma_loc > 5) {
    fprintf(stderr, "Input error: --chromaloc parameter out of range [0..5]\n");
    error = 1;
  }

  if (cfg->owf < -1) {
    fprintf(stderr, "Input error: --owf must be nonnegative or -1\n");
    error = 1;
  }

  if (cfg->qp != CLIP_TO_QP(cfg->qp)) {
      fprintf(stderr, "Input error: --qp parameter out of range [0..51]\n");
      error = 1;
  }

  if (abs(cfg->intra_qp_offset) > 51) {
    fprintf(stderr, "Input error: --intra-qp-offset out of range [-51..51]\n");
    error = 1;
  }

  if (cfg->target_bitrate < 0) {
      fprintf(stderr, "Input error: --bitrate must be nonnegative\n");
      error = 1;
  }

  for( size_t i = 0; i < KVZ_MAX_GOP_LAYERS; i++ )
  {
      if( cfg->pu_depth_inter.min[i] < 0 || cfg->pu_depth_inter.max[i] < 0 ) continue;

      if( !WITHIN( cfg->pu_depth_inter.min[i], PU_DEPTH_INTER_MIN, PU_DEPTH_INTER_MAX ) ||
          !WITHIN( cfg->pu_depth_inter.max[i], PU_DEPTH_INTER_MIN, PU_DEPTH_INTER_MAX ) )
      {
          fprintf( stderr, "Input error: illegal value for --pu-depth-inter (%d-%d)\n",
                   cfg->pu_depth_inter.min[i], cfg->pu_depth_inter.max[i] );
          error = 1;
      }
      else if( cfg->pu_depth_inter.min[i] > cfg->pu_depth_inter.max[i] )
      {
          fprintf( stderr, "Input error: Inter PU depth min (%d) > max (%d)\n",
                   cfg->pu_depth_inter.min[i], cfg->pu_depth_inter.max[i] );
          error = 1;
      }

      if( cfg->pu_depth_intra.min[i] < 0 || cfg->pu_depth_intra.max[i] < 0 ) continue;

      if( !WITHIN( cfg->pu_depth_intra.min[i], PU_DEPTH_INTRA_MIN, PU_DEPTH_INTRA_MAX ) ||
          !WITHIN( cfg->pu_depth_intra.max[i], PU_DEPTH_INTRA_MIN, PU_DEPTH_INTRA_MAX ) )
      {
          fprintf( stderr, "Input error: illegal value for --pu-depth-intra (%d-%d)\n",
                   cfg->pu_depth_intra.min[i], cfg->pu_depth_intra.max[i] );
          error = 1;
      }
      else if( cfg->pu_depth_intra.min[i] > cfg->pu_depth_intra.max[i] )
      {
          fprintf( stderr, "Input error: Intra PU depth min (%d) > max (%d)\n",
                   cfg->pu_depth_intra.min[i], cfg->pu_depth_intra.max[i] );
          error = 1;
      }
  }

  // Tile separation should be at round position in terms of LCU, should be monotonic, and should not start by 0
  if (cfg->tiles_width_split) {
    int i;
    int32_t prev_tile_split = 0;
    for (i=0; i < cfg->tiles_width_count - 1; ++i) {
      if (cfg->tiles_width_split[i] <= prev_tile_split) {
        fprintf(stderr, "Input error: tile separations in width should be strictly monotonic (%d <= %d)\n", cfg->tiles_width_split[i], prev_tile_split);
        error = 1;
        break;
      }
      if ((cfg->tiles_width_split[i] % LCU_WIDTH) != 0) {
        fprintf(stderr, "Input error: tile separation in width %d (at %d) is not at a multiple of LCU_WIDTH (%d)\n", i, cfg->tiles_width_split[i], LCU_WIDTH);
        error = 1;
        break;
      }
      prev_tile_split = cfg->tiles_width_split[i];
    }
    if (cfg->tiles_width_split[cfg->tiles_width_count - 2] >= cfg->width) {
      fprintf(stderr, "Input error: last x tile separation in width (%d) should smaller than image width (%d)\n", cfg->tiles_width_split[cfg->tiles_width_count - 2], cfg->width);
      error = 1;
    }
  }

  if (cfg->tiles_height_split) {
    int i;
    int32_t prev_tile_split = 0;
    for (i=0; i < cfg->tiles_height_count - 1; ++i) {
      if (cfg->tiles_height_split[i] <= prev_tile_split) {
        fprintf(stderr, "Input error: tile separations in height should be strictly monotonic (%d <= %d)\n", cfg->tiles_height_split[i], prev_tile_split);
        error = 1;
        break;
      }
      if ((cfg->tiles_height_split[i] % LCU_WIDTH) != 0) {
        fprintf(stderr, "Input error: tile separation in height %d (at %d) is not at a multiple of LCU_WIDTH (%d)\n", i, cfg->tiles_height_split[i], LCU_WIDTH);
        error = 1;
        break;
      }
      prev_tile_split = cfg->tiles_height_split[i];
    }

    if (cfg->tiles_height_split[cfg->tiles_height_count - 2] >= cfg->height) {
      fprintf(stderr, "Input error: last tile separation in height (%d) should smaller than image height (%d)\n", cfg->tiles_height_split[cfg->tiles_height_count - 2], cfg->height);
      error = 1;
    }
  }

  if (cfg->implicit_rdpcm && !cfg->lossless) {
    fprintf(stderr, "Input error: --implicit-rdpcm is not suppoted without --lossless\n");
    error = 1;
  }

  if ((cfg->slices & KVZ_SLICES_WPP) && !cfg->wpp) {
    fprintf(stderr, "Input error: --slices=wpp does not work without --wpp.\n");
    error = 1;
  }

  if ((cfg->scaling_list == KVZ_SCALING_LIST_CUSTOM) && !cfg->cqmfile) {
    fprintf(stderr, "Input error: --scaling-list=custom does not work without --cqmfile=<FILE>.\n");
    error = 1;
  }

  if (validate_hevc_level((kvz_config *const) cfg)) {
    // a level error found and it's not okay
    error = 1;
  }

  if(cfg->target_bitrate > 0 && cfg->rc_algorithm == KVZ_NO_RC) {
    fprintf(stderr, "Bitrate set but rc-algorithm is turned off.\n");
    error = 1;
  }

  if(cfg->target_bitrate == 0 && cfg->rc_algorithm != KVZ_NO_RC) {
    fprintf(stderr, "Rate control algorithm set but bitrate not set.\n");
    error = 1;
  }

  return !error;
}

static int validate_hevc_level(kvz_config *const cfg) {
  static const struct { uint32_t lsr; uint32_t lps; uint32_t main_bitrate; } LEVEL_CONSTRAINTS[13] = {
    { 552960, 36864, 128 }, // 1

    { 3686400, 122880, 1500 }, // 2
    { 7372800, 245760, 3000 }, // 2.1

    { 16588800, 552960, 6000 },  // 3
    { 33177600, 983040, 10000 }, // 3.1

    { 66846720, 2228224, 12000 },  // 4
    { 133693440, 2228224, 20000 }, // 4.1

    { 267386880, 8912896, 25000 },  // 5
    { 534773760, 8912896, 40000 },  // 5.1
    { 1069547520, 8912896, 60000 }, // 5.2

    { 1069547520, 35651584, 60000 },  // 6
    { 2139095040, 35651584, 120000 }, // 6.1
    { 4278190080, 35651584, 240000 }, // 6.2
  };

  // bit rates for the high-tiers of the levels from 4 to 6.2
  static const uint32_t HIGH_TIER_BITRATES[8] = {
    30000, 50000, 100000, 160000, 240000, 240000, 480000, 800000
  };

  int level_error = 0;

  const char* level_err_prefix;
  if (cfg->force_level) {
    level_err_prefix = "Level warning";
  } else {
    level_err_prefix = "Level error";
  }

  uint8_t lvl_idx;

  // for nicer error print
  float lvl = ((float)cfg->level) / 10.0f;

  // check if the level is valid and get it's lsr and lps values
  switch (cfg->level) {
  case 10:
    lvl_idx = 0;
    break;
  case 20:
    lvl_idx = 1;
    break;
  case 21:
    lvl_idx = 2;
    break;
  case 30:
    lvl_idx = 3;
    break;
  case 31:
    lvl_idx = 4;
    break;
  case 40:
    lvl_idx = 5;
    break;
  case 41:
    lvl_idx = 6;
    break;
  case 50:
    lvl_idx = 7;
    break;
  case 51:
    lvl_idx = 8;
    break;
  case 52:
    lvl_idx = 9;
    break;
  case 60:
    lvl_idx = 10;
    break;
  case 61:
    lvl_idx = 11;
    break;
  case 62:
    lvl_idx = 12;
    break;

  default:
    fprintf(stderr, "Input error: %g is an invalid level value\n", lvl);
    return 1;
  }

  if (cfg->high_tier && cfg->level < 40) {
    fprintf(stderr, "Input error: high tier requires at least level 4\n");
    return 1;
  }

  // max luma sample rate
  uint32_t max_lsr = LEVEL_CONSTRAINTS[lvl_idx].lsr;

  // max luma picture size
  uint32_t max_lps = LEVEL_CONSTRAINTS[lvl_idx].lps;

  if (cfg->high_tier) {
    cfg->max_bitrate = HIGH_TIER_BITRATES[lvl_idx - 5] * 1000;
  } else {
    cfg->max_bitrate = LEVEL_CONSTRAINTS[lvl_idx].main_bitrate * 1000;
  }

  if (cfg->target_bitrate > cfg->max_bitrate) {
    fprintf(stderr, "%s: target bitrate exceeds %i, which is the maximum %s tier level %g bitrate\n",
      level_err_prefix, cfg->max_bitrate, cfg->high_tier?"high":"main", lvl);
    level_error = 1;
  }

  // check the conformance to the level limits

  // luma samples
  uint64_t cfg_samples = cfg->width * cfg->height;

  // luma sample rate
  double framerate = ((double)cfg->framerate_num) / ((double)cfg->framerate_denom);
  uint64_t cfg_sample_rate = cfg_samples * (uint64_t) framerate;

  // square of the maximum allowed dimension
  uint32_t max_dimension_squared = 8 * max_lps;

  // check maximum dimensions
  if (cfg->width * cfg->width > max_dimension_squared) {
    uint32_t max_dim = sqrtf(max_dimension_squared);
    fprintf(stderr, "%s: picture width of %i is too large for this level (%g), maximum dimension is %i\n",
      level_err_prefix, cfg->width, lvl, max_dim);
    level_error = 1;
  }
  if (cfg->height * cfg->height > max_dimension_squared) {
    uint32_t max_dim = sqrtf(max_dimension_squared);
    fprintf(stderr, "%s: picture height of %i is too large for this level (%g), maximum dimension is %i\n",
      level_err_prefix, cfg->height, lvl, max_dim);
    level_error = 1;
  }

  // check luma picture size
  if (cfg_samples > max_lps) {
    fprintf(stderr, "%s: picture resolution of %ix%i is too large for this level (%g) (it has %llu samples, maximum is %u samples)\n",
      level_err_prefix, cfg->width, cfg->height, lvl, (unsigned long long) cfg_samples, max_lps);
    level_error = 1;
  }

  // check luma sample rate
  if (cfg_sample_rate > max_lsr) {
    fprintf(stderr, "%s: framerate of %g is too big for this level (%g) and picture resolution (it has the sample rate of %llu, maximum is %u\n",
      level_err_prefix, framerate, lvl, (unsigned long long) cfg_sample_rate, max_lsr);
    level_error = 1;
  }

  if (cfg->force_level) {
    // we wanted to print warnings, not get errors
    return 0;
  } else {
    return level_error;
  }
}
