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 AudioFactory instance
auto &audioFactory = audioFactory::getInstance();
2. Get the AudioManager object and check for audio subsystem Readiness
std::promise<ServiceStatus> prom{};
audioManager = audioFactory.getAudioManager([&prom](ServiceStatus serviceStatus) {
prom.set_value(serviceStatus);
});
if (!audioManager) {
std::cout << "Failed to get AudioManager object" << std::endl;
return;
}
ServiceStatus managerStatus = audioManager->getServiceStatus();
if (managerStatus != ServiceStatus::SERVICE_AVAILABLE) {
std::cout << "\nAudio subsystem is not ready, Please wait ..." << std::endl;
managerStatus = prom.get_future().get();
}
if (managerStatus == ServiceStatus::SERVICE_AVAILABLE) {
std::cout << "Audio Subsytem is Ready << std::endl;
} else {
std::cout << "ERROR - Unable to initialize audio subsystem" << std::endl;
return;
}
3. Create an audio Stream (to be associated with loopback)
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);
}
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);
4. Start loopback between the specified source and sink devices
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;
}
status = audioLoopbackStream->startLoopback(startLoopbackCallback);
5. Stop loopback between the specified source and sink devices
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;
}
status = audioLoopbackStream->stopLoopback(stopLoopbackCallback);
6. Delete the audio stream associated with the Loopback session
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();
}
status = audioManager->deleteStream(std::dynamic_pointer_cast<IAudioStream>(audioLoopbackStream),
deleteStreamCallback);