embdrv/lc3/Encoder/Lc3Encoder.cpp

/*
 * Lc3Encoder.cpp
 *
 * 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.
 */

#include "Lc3Encoder.hpp"

#include <cstring>

#include "EncoderTop.hpp"

using namespace Lc3Enc;

Lc3Encoder::Lc3Encoder(uint16_t Fs)
    : Lc3Encoder(Lc3Config(Fs, Lc3Config::FrameDuration::d10ms, 1)) {}

Lc3Encoder::Lc3Encoder(Lc3Config lc3Config_, uint8_t bits_per_audio_sample_enc_,
                       void* datapoints)
    : lc3Config(lc3Config_),
      bits_per_audio_sample_enc(bits_per_audio_sample_enc_),
      encoderList(lc3Config.Nc) {
  // proceed only with valid configuration
  if (lc3Config.isValid() && (16 == bits_per_audio_sample_enc)) {
    for (uint8_t channelNr = 0; channelNr < lc3Config.Nc; channelNr++) {
      encoderList[channelNr] = new EncoderTop(
          lc3Config, reinterpret_cast<DatapointContainer*>(datapoints));
    }
  }
}

Lc3Encoder::~Lc3Encoder() {
  for (uint8_t channelNr = 0; channelNr < lc3Config.Nc; channelNr++) {
    EncoderTop* encoderTop = encoderList[channelNr];
    if (nullptr != encoderTop) {
      delete encoderTop;
    }
  }
}

uint8_t Lc3Encoder::run(const int16_t* x_s, uint16_t byte_count, uint8_t* bytes,
                        uint8_t channelNr) {
  if (!lc3Config.isValid()) {
    return INVALID_CONFIGURATION;
  }
  if ((byte_count < 20) || (byte_count > 400)) {
    return INVALID_BYTE_COUNT;
  }
  if (bits_per_audio_sample_enc != 16) {
    return INVALID_BITS_PER_AUDIO_SAMPLE;
  }
  if (nullptr == encoderList[channelNr]) {
    return ENCODER_ALLOCATION_ERROR;
  }

  encoderList[channelNr]->run(x_s, byte_count, bytes);
  return ERROR_FREE;
}

uint8_t Lc3Encoder::run(const int16_t* x_s,
                        const uint16_t* byte_count_per_channel,
                        uint8_t* bytes) {
  if (!lc3Config.isValid()) {
    return INVALID_CONFIGURATION;
  }

  uint8_t returnCode = ERROR_FREE;
  uint32_t byteOffset = 0;
  for (uint8_t channelNr = 0; channelNr < lc3Config.Nc; channelNr++) {
    // Note: bitwise or of the single channel return code will not allow
    // uniquely to decode
    //       the given error. The idea is to catch any error. This decision
    //       makes the API more simple. However, when the precise error code is
    //       needed, the single channel call has to be made separately.
    returnCode |=
        run(&x_s[channelNr * lc3Config.NF], byte_count_per_channel[channelNr],
            &bytes[byteOffset], channelNr);
    byteOffset += byte_count_per_channel[channelNr];
  }
  return returnCode;
}