Audio Manager API Sample Reference for audio loopback session.

Please follow the below steps to start/stop loopback on a loopback session.

### 1. Get the Audio Factory and Audio Manager instances ###

auto &audioFactory = AudioFactory::getInstance();
auto audioManager = audioFactory.getAudioManager();

### 2. Wait for the Audio subsystem to be initialized and ready ###

bool isReady = audioManager->isSubsystemReady();
if(!isReady) {
    std::cout << "Audio subsystem is not ready, waiting for it to be ready " << std::endl;
    std::future<bool> f = audioManager->onSubsystemReady();
    isReady = f.get();
}

### 3. Exit the application, if SDK is unable to initialize Audio subsystem ###

if(isReady) {
    std::cout << " *** Audio subsystem is Ready *** " << std::endl;
} else {
    std::cout << " *** ERROR - Unable to initialize Audio subsystem " << std::endl;
    return 1;
}

### 4. Create an audio Stream (to be associated with loopback) ###

// Implement a response function to get the request status
void createStreamCallback(std::shared_ptr<IAudioStream> &stream, ErrorCode error) {
    if (error != ErrorCode::SUCCESS) {
        std::cout << "createStream() failed with error" << static_cast<int>(error) << std::endl;
        return;
    }
    std::cout << "createStream() succeeded." << std::endl;
    audioLoopbackStream = std::dynamic_pointer_cast<IAudioLoopbackStream>(stream);
}
// Create a loopback stream with required configuration
config.type = telux::audio::StreamType::LOOPBACK;
config.sampleRate = 48000;
config.format = AudioFormat::PCM_16BIT_SIGNED;
config.channelTypeMask = ChannelType::LEFT;
config.deviceTypes.emplace_back(DeviceType::DEVICE_TYPE_SPEAKER);
config.deviceTypes.emplace_back(DeviceType::DEVICE_TYPE_MIC);
status = audioManager->createStream(config, createStreamCallback);

### 6. Start loopback between the specified source and sink devices ###

// Implement a response function to get the request status
void startLoopbackCallback(ErrorCode error)
{
    if (error != ErrorCode::SUCCESS) {
        std::cout << "startLoopback() failed with error" << static_cast<int>(error) << std::endl;
        return;
    }
    std::cout << "startLoopback() succeeded." << std::endl;
}
// start loopback
status = audioLoopbackStream->startLoopback(startLoopbackCallback);

### 7. Stop loopback between the specified source and sink devices ###

// Implement a response function to get the request status
void stopLoopbackCallback(ErrorCode error)
{
    if (error != ErrorCode::SUCCESS) {
        std::cout << "stopLoopback() failed with error " << static_cast<int>(error) << std::endl;
        return;
    }
    std::cout << "stopLoopback() succeeded." << std::endl;
}
// Stop the loopback, which was started earlier
status = audioLoopbackStream->stopLoopback(stopLoopbackCallback);

8. Delete the audio stream associated with the Loopback session

// Implement a response function to get the request status
void deleteStreamCallback(ErrorCode error) {
    if (error != ErrorCode::SUCCESS) {
        std::cout << "deleteStream() failed with error" << static_cast<int>(error) << std::endl;
        return;
    }
    std::cout << "deleteStream() succeeded." << std::endl;
    audioLoopbackStream.reset();
}
//Delete the Audio Stream
status = audioManager->deleteStream(std::dynamic_pointer_cast<IAudioStream>(audioLoopbackStream),
                                deleteStreamCallback);