bluetooth/audio/aidl/default/HfpSoftwareAudioProvider.cpp

/*
 * 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.
 */

#define LOG_TAG "BTAudioProviderHfpSW"

#include "HfpSoftwareAudioProvider.h"

#include <BluetoothAudioCodecs.h>
#include <BluetoothAudioSessionReport.h>
#include <android-base/logging.h>

namespace aidl {
namespace android {
namespace hardware {
namespace bluetooth {
namespace audio {

static constexpr uint32_t kBufferCount = 2;  // two frame buffer

HfpSoftwareOutputAudioProvider::HfpSoftwareOutputAudioProvider()
    : HfpSoftwareAudioProvider() {
  session_type_ = SessionType::HFP_SOFTWARE_ENCODING_DATAPATH;
}

HfpSoftwareInputAudioProvider::HfpSoftwareInputAudioProvider()
    : HfpSoftwareAudioProvider() {
  session_type_ = SessionType::HFP_SOFTWARE_DECODING_DATAPATH;
}

HfpSoftwareAudioProvider::HfpSoftwareAudioProvider()
    : BluetoothAudioProvider(), data_mq_(nullptr) {
}

bool HfpSoftwareAudioProvider::isValid(const SessionType& sessionType) {
  return (sessionType == session_type_);
}

ndk::ScopedAStatus HfpSoftwareAudioProvider::startSession(
    const std::shared_ptr<IBluetoothAudioPort>& host_if,
    const AudioConfiguration& audio_config,
    const std::vector<LatencyMode>& latency_modes, DataMQDesc* _aidl_return) {
  if (audio_config.getTag() != AudioConfiguration::pcmConfig) {
    LOG(WARNING) << __func__ << " - Invalid Audio Configuration="
                 << audio_config.toString();
    *_aidl_return = DataMQDesc();
    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
  }
  const PcmConfiguration& pcm_config =
      audio_config.get<AudioConfiguration::pcmConfig>();
  if (!BluetoothAudioCodecs::IsSoftwarePcmConfigurationValid(pcm_config)) {
    LOG(WARNING) << __func__ << " - Unsupported PCM Configuration="
                 << pcm_config.toString();
    *_aidl_return = DataMQDesc();
    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
  }

  bool isValidConfig = true;

  if (pcm_config.bitsPerSample != 16) {
    isValidConfig = false;
  }

  if (pcm_config.sampleRateHz != 8000 && pcm_config.sampleRateHz != 16000 &&
      pcm_config.sampleRateHz != 32000) {
    isValidConfig = false;
  }

  if (pcm_config.channelMode != ChannelMode::MONO) {
    isValidConfig = false;
  }

  if (pcm_config.dataIntervalUs != 7500) {
    isValidConfig = false;
  }

  int bytes_per_sample = pcm_config.bitsPerSample / 8;

  uint32_t data_mq_size = kBufferCount * bytes_per_sample *
                          (pcm_config.sampleRateHz / 1000) *
                          pcm_config.dataIntervalUs / 1000;
  if (!isValidConfig) {
    LOG(ERROR) << __func__ << "Unexpected audio buffer size: " << data_mq_size
               << ", SampleRateHz: " << pcm_config.sampleRateHz
               << ", ChannelMode: " << toString(pcm_config.channelMode)
               << ", BitsPerSample: "
               << static_cast<int>(pcm_config.bitsPerSample)
               << ", BytesPerSample: " << bytes_per_sample
               << ", DataIntervalUs: " << pcm_config.dataIntervalUs
               << ", SessionType: " << toString(session_type_);
    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
  }

  LOG(INFO) << __func__ << " - size of audio buffer " << data_mq_size
            << " byte(s)";

  std::unique_ptr<DataMQ> temp_data_mq(
      new DataMQ(data_mq_size, /* EventFlag */ true));
  if (temp_data_mq == nullptr || !temp_data_mq->isValid()) {
    ALOGE_IF(!temp_data_mq, "failed to allocate data MQ");
    ALOGE_IF(temp_data_mq && !temp_data_mq->isValid(), "data MQ is invalid");
    *_aidl_return = DataMQDesc();
    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
  }
  data_mq_ = std::move(temp_data_mq);

  return BluetoothAudioProvider::startSession(host_if, audio_config,
                                              latency_modes, _aidl_return);
}

ndk::ScopedAStatus HfpSoftwareAudioProvider::onSessionReady(
    DataMQDesc* _aidl_return) {
  if (data_mq_ == nullptr || !data_mq_->isValid()) {
    *_aidl_return = DataMQDesc();
    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
  }
  *_aidl_return = data_mq_->dupeDesc();
  auto desc = data_mq_->dupeDesc();
  BluetoothAudioSessionReport::OnSessionStarted(
      session_type_, stack_iface_, &desc, *audio_config_, latency_modes_);
  return ndk::ScopedAStatus::ok();
}

}  // namespace audio
}  // namespace bluetooth
}  // namespace hardware
}  // namespace android
}  // namespace aidl