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/*
* Copyright 2020 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 "BTAudioProviderA2dpSoftware"
#include "A2dpSoftwareAudioProvider.h"
#include <android-base/logging.h>
#include "BluetoothAudioSessionReport_2_1.h"
#include "BluetoothAudioSupportedCodecsDB_2_1.h"
namespace android {
namespace hardware {
namespace bluetooth {
namespace audio {
namespace V2_1 {
namespace implementation {
using ::android::bluetooth::audio::BluetoothAudioSessionReport_2_1;
using ::android::hardware::Void;
using ::android::hardware::bluetooth::audio::V2_0::AudioConfiguration;
// Here the buffer size is based on SBC
static constexpr uint32_t kPcmFrameSize = 4; // 16 bits per sample / stereo
// SBC is 128, and here we choose the LCM of 16, 24, and 32
static constexpr uint32_t kPcmFrameCount = 96;
static constexpr uint32_t kRtpFrameSize = kPcmFrameSize * kPcmFrameCount;
// The max counts by 1 tick (20ms) for SBC is about 7. Since using 96 for the
// PCM counts, here we just choose a greater number
static constexpr uint32_t kRtpFrameCount = 10;
static constexpr uint32_t kBufferSize = kRtpFrameSize * kRtpFrameCount;
static constexpr uint32_t kBufferCount = 2; // double buffer
static constexpr uint32_t kDataMqSize = kBufferSize * kBufferCount;
A2dpSoftwareAudioProvider::A2dpSoftwareAudioProvider()
: BluetoothAudioProvider(), mDataMQ(nullptr) {
LOG(INFO) << __func__ << " - size of audio buffer " << kDataMqSize
<< " byte(s)";
std::unique_ptr<DataMQ> tempDataMQ(
new DataMQ(kDataMqSize, /* EventFlag */ true));
if (tempDataMQ && tempDataMQ->isValid()) {
mDataMQ = std::move(tempDataMQ);
session_type_ = SessionType::A2DP_SOFTWARE_ENCODING_DATAPATH;
} else {
ALOGE_IF(!tempDataMQ, "failed to allocate data MQ");
ALOGE_IF(tempDataMQ && !tempDataMQ->isValid(), "data MQ is invalid");
}
}
bool A2dpSoftwareAudioProvider::isValid(const V2_0::SessionType& sessionType) {
return isValid(static_cast<SessionType>(sessionType));
}
bool A2dpSoftwareAudioProvider::isValid(const SessionType& sessionType) {
return (sessionType == session_type_ && mDataMQ && mDataMQ->isValid());
}
Return<void> A2dpSoftwareAudioProvider::startSession(
const sp<IBluetoothAudioPort>& hostIf,
const V2_0::AudioConfiguration& audioConfig, startSession_cb _hidl_cb) {
/**
* Initialize the audio platform if audioConfiguration is supported.
* Save the IBluetoothAudioPort interface, so that it can be used
* later to send stream control commands to the HAL client, based on
* interaction with Audio framework.
*/
if (audioConfig.getDiscriminator() !=
AudioConfiguration::hidl_discriminator::pcmConfig) {
LOG(WARNING) << __func__
<< " - Invalid Audio Configuration=" << toString(audioConfig);
_hidl_cb(BluetoothAudioStatus::UNSUPPORTED_CODEC_CONFIGURATION,
DataMQ::Descriptor());
return Void();
} else if (!android::bluetooth::audio::IsSoftwarePcmConfigurationValid(
audioConfig.pcmConfig())) {
LOG(WARNING) << __func__ << " - Unsupported PCM Configuration="
<< toString(audioConfig.pcmConfig());
_hidl_cb(BluetoothAudioStatus::UNSUPPORTED_CODEC_CONFIGURATION,
DataMQ::Descriptor());
return Void();
}
return BluetoothAudioProvider::startSession(hostIf, audioConfig, _hidl_cb);
}
Return<void> A2dpSoftwareAudioProvider::onSessionReady(
startSession_cb _hidl_cb) {
if (mDataMQ && mDataMQ->isValid()) {
BluetoothAudioSessionReport_2_1::OnSessionStarted(
session_type_, stack_iface_, mDataMQ->getDesc(), audio_config_);
_hidl_cb(BluetoothAudioStatus::SUCCESS, *mDataMQ->getDesc());
} else {
_hidl_cb(BluetoothAudioStatus::FAILURE, DataMQ::Descriptor());
}
return Void();
}
} // namespace implementation
} // namespace V2_1
} // namespace audio
} // namespace bluetooth
} // namespace hardware
} // namespace android
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