/******************************************************************************

 *                                                                            *

 * Copyright (C) 2023 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at:

 *

 * http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 *

 *****************************************************************************

 * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore

 */

#include <stdlib.h>

#include <string.h>

#include <math.h>

#include "ixheaac_type_def.h"

#include "ixheaac_error_standards.h"

#include "ixheaace_error_codes.h"

#include "ixheaace_mps_common_fix.h"

#include "ixheaace_mps_defines.h"

#include "ixheaace_mps_common_define.h"

#include "ixheaace_mps_onset_detect.h"

#include "ixheaace_mps_vector_functions.h"

#include "ixheaac_constants.h"

#include "ixheaac_basic_ops32.h"

#include "ixheaac_basic_ops40.h"

#include "ixheaac_basic_ops.h"

IA_ERRORCODE ixheaace_mps_212_onset_detect_init(

    ixheaace_mps_pstr_onset_detect pstr_onset_detect,

    const ixheaace_mps_pstr_onset_detect_config pstr_onset_detect_config,

    const UWORD32 init_flag) {

  IA_ERRORCODE error = IA_NO_ERROR;

  WORD32 slot;

  if ((pstr_onset_detect_config->max_time_slots > pstr_onset_detect->max_time_slots) ||

      (pstr_onset_detect_config->upper_bound_onset_detection <

       pstr_onset_detect->lower_bound_onset_detection)) {

    return IA_EXHEAACE_CONFIG_NONFATAL_MPS_INVALID_CONFIG;

  }

  pstr_onset_detect->avg_energy_dist_scale = 4;

  pstr_onset_detect->min_trans_dist = 8;

  pstr_onset_detect->avg_energy_dist = 16;

  pstr_onset_detect->lower_bound_onset_detection =

      pstr_onset_detect_config->lower_bound_onset_detection;

  pstr_onset_detect->upper_bound_onset_detection =

      pstr_onset_detect_config->upper_bound_onset_detection;

  pstr_onset_detect->max_time_slots = pstr_onset_detect_config->max_time_slots;

  if (init_flag) {

    for (slot = 0; slot < pstr_onset_detect->avg_energy_dist + pstr_onset_detect->max_time_slots;

         slot++) {

      pstr_onset_detect->p_energy_hist[slot] = EPSILON;

    }

  }

  return error;

}

IA_ERRORCODE

ixheaace_mps_212_onset_detect_update(ixheaace_mps_pstr_onset_detect pstr_onset_detect,

                                     const WORD32 time_slots) {

  IA_ERRORCODE error = IA_NO_ERROR;

  WORD32 slot;

  if (time_slots > pstr_onset_detect->max_time_slots) {

    error = IA_EXHEAACE_CONFIG_NONFATAL_MPS_INVALID_CONFIG;

  } else {

    for (slot = 0; slot < pstr_onset_detect->avg_energy_dist; slot++) {

      pstr_onset_detect->p_energy_hist[slot] =

          pstr_onset_detect->p_energy_hist[slot + time_slots];

    }

    for (slot = 0; slot < time_slots; slot++) {

      pstr_onset_detect->p_energy_hist[pstr_onset_detect->avg_energy_dist + slot] = EPSILON;

    }

  }

  return error;

}

IA_ERRORCODE ixheaace_mps_212_onset_detect_apply(

    ixheaace_mps_pstr_onset_detect pstr_onset_detect, const WORD32 num_time_slots,

    ixheaace_cmplx_str pp_hybrid_data[MAX_ANA_TIME_SLOT][MAX_QMF_BANDS], const WORD32 prev_pos,

    WORD32 p_transient_pos[MAX_NUM_TRANS]) {

  IA_ERRORCODE error = IA_NO_ERROR;

  WORD32 slot, tran_cnt, curr_pos;

  WORD32 trans;

  WORD32 lower_bound_onset_detection = pstr_onset_detect->lower_bound_onset_detection;

  WORD32 upper_bound_onset_detection = pstr_onset_detect->upper_bound_onset_detection;

  WORD32 avg_energy = pstr_onset_detect->avg_energy_dist;

  WORD32 curr_pos_prev;

  FLOAT32 p1, p2;

  FLOAT32 threshold_square = (FLOAT32)SPACE_ONSET_THRESHOLD_SQUARE_FLT;

  FLOAT32 *ptr_energy = pstr_onset_detect->p_energy_hist;

  FLOAT32 energy[16 + MAX_TIME_SLOTS];

  memset(energy, 0, (16 + MAX_TIME_SLOTS) * sizeof(FLOAT32));

  tran_cnt = 0;

  p2 = 0.0f;

  for (trans = 0; trans < MAX_NUM_TRANS; trans++) {

    p_transient_pos[trans] = -1;

  }

  if (prev_pos <= 0) {

    curr_pos = num_time_slots;

  } else {

    curr_pos = MAX(num_time_slots, prev_pos - num_time_slots + pstr_onset_detect->min_trans_dist);

  }

  for (slot = 0; slot < num_time_slots; slot++) {

    ptr_energy[avg_energy + slot] = ixheaace_mps_212_sum_up_cplx_pow_2(

        &pp_hybrid_data[slot][lower_bound_onset_detection + 1],

        upper_bound_onset_detection - lower_bound_onset_detection - 1);

  }

  for (slot = 0; slot < (num_time_slots + avg_energy); slot++) {

    energy[slot] = ptr_energy[slot];

  }

  curr_pos_prev = curr_pos;

  for (; (curr_pos < (num_time_slots << 1)) && (tran_cnt < MAX_NUM_TRANS); curr_pos++) {

    p1 = energy[curr_pos - num_time_slots + avg_energy] * threshold_square;

    if (curr_pos_prev != (curr_pos - 1)) {

      p2 = 0.0f;

      for (slot = 0; slot < avg_energy; slot++) {

        p2 += energy[curr_pos - num_time_slots + slot];

      }

    } else {

      p2 += energy[curr_pos - num_time_slots + avg_energy - 1];

#ifdef _WIN32

#pragma warning(suppress : 6385)

#endif

      p2 -= energy[curr_pos_prev - num_time_slots];

    }

    curr_pos_prev = curr_pos;

    if (p1 > p2) {

      p_transient_pos[tran_cnt++] = curr_pos;

      curr_pos += pstr_onset_detect->min_trans_dist;

    }

  }

  return error;

}