embdrv/lc3/Decoder/LongTermPostfilter.hpp

/*
 * LongTermPostfilter.hpp
 *
 * Copyright 2021 HIMSA II K/S - www.himsa.com. Represented by EHIMA -
 * www.ehima.com
 *
 * 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.
 */

#ifndef LONG_TERM_POSTFILTER_H_
#define LONG_TERM_POSTFILTER_H_

#include <cstdint>

#include "Datapoints.hpp"
#include "Lc3Config.hpp"

namespace Lc3Dec {

class LongTermPostfilter {
 public:
  LongTermPostfilter(const Lc3Config& lc3Config_, uint16_t nbits);
  ~LongTermPostfilter();

  void registerDatapoints(DatapointContainer* datapoints);

  LongTermPostfilter& operator=(const LongTermPostfilter&);

  void setInputX(const double* const x_hat);
  void run(int16_t ltpf_active, int16_t pitch_index);

  const Lc3Config& lc3Config;
  const uint8_t numMemBlocks;
  double* x_hat_ltpf;

 private:
  void setGainParams(uint16_t nbits);
  void computeFilterCoeffs(uint16_t pitch_index);

  int16_t ltpf_active_prev;
  uint16_t blockStartIndex;
  double* c_num;
  double* c_den;
  double* c_num_mem;
  double* c_den_mem;
  double* x_hat_ltpfin;
  double* x_hat_mem;
  double* x_hat_ltpf_mem;

  uint8_t L_num;
  uint8_t L_den;

  double gain_ltpf;
  uint8_t gain_ind;

  uint16_t p_int;
  uint16_t p_fr;
  uint16_t p_int_mem;
  uint16_t p_fr_mem;
};

}  // namespace Lc3Dec

#endif  // LONG_TERM_POSTFILTER_H_