Audio Manager API Sample Reference for audio capture session
This Section demonstrates how to use the Audio Manager API for audio capture 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 (Audio Capture Session)
void createStreamCallback(std::shared_ptr<IAudioStream> &stream, ErrorCode error)
{
if (error != ErrorCode::SUCCESS) {
std::cout << "createStream() returned with error " << static_cast<int>(error)
<< std::endl;
return;
}
std::cout << "createStream() succeeded." << std::endl;
audioCaptureStream = std::dynamic_pointer_cast<IAudioCaptureStream>(stream);
}
StreamConfig config;
config.type = StreamType::CAPTURE;
config.sampleRate = 48000;
config.format = AudioFormat::PCM_16BIT_SIGNED;
config.channelTypeMask = ChannelType::LEFT;
config.deviceTypes.emplace_back(DeviceType::DEVICE_TYPE_SPEAKER);
status = audioManager->createStream(config, createStreamCallback);
4. Allocate Stream Buffers for Capture Operation
auto streamBuffer = audioCaptureStream->getStreamBuffer();
if(streamBuffer != nullptr) {
bytesToRead = streamBuffer->getMinSize();
if(bytesToRead == 0) {
bytesToRead = streamBuffer->getMaxSize();
}
} else {
std::cout << "Failed to get Stream Buffer " << std::endl;
return EXIT_FAILURE;
}
5. Start read operation for the capture to Start
void readCallback(std::shared_ptr<IStreamBuffer> buffer, ErrorCode error)
{
uint32_t bytesWrittenToFile = 0;
if (error != ErrorCode::SUCCESS) {
std::cout << "read() returned with error " << static_cast<int>(error) << std::endl;
} else {
uint32_t size = buffer->getDataSize();
std::cout << "Successfully read " << size << " bytes" << std::endl;
}
buffer->reset();
return;
}
auto status = audioCaptureStream->read(streamBuffer, bytesToRead, readCallback);
if(status != telux::common::Status::SUCCESS) {
std::cout << "read() failed with error" << static_cast<int>(status) << std::endl;
} else {
std::cout << "Request to read stream sent" << std::endl;
}
6. Delete an Audio Stream (Audio Capture Session), once required bytes captured
void deleteStreamCallback(ErrorCode error) {
if (error != ErrorCode::SUCCESS) {
std::cout << "deleteStream() returned with error " << static_cast<int>(error)
<< std::endl;
return;
}
std::cout << "deleteStream() succeeded." << std::endl;
audioCaptureStream.reset();
}
Status status = audioManager->deleteStream(
std::dynamic_pointer_cast<IAudioStream>(audioCaptureStream), deleteStreamCallback);
if (status != Status::SUCCESS) {
std::cout << "deleteStream failed with error" << static_cast<int>(status) << std::endl;
}