Using Audio Manager APIs to play DTMF tone in a voice call.

Using Audio Manager APIs to play DTMF tone in a voice call

Please follow the below steps to play a DTMF tone in an active voice call. Note that only Rx direction is supported now.

1. Get the AudioFactory instance

auto &audioFactory = audioFactory::getInstance();

2. Get the AudioManager object and check for audio subsystem Readiness

std::promise<ServiceStatus> prom{};
//  Get AudioManager instance.
audioManager = audioFactory.getAudioManager([&prom](ServiceStatus serviceStatus) {
    prom.set_value(serviceStatus);
});
if (!audioManager) {
    std::cout << "Failed to get AudioManager object" << std::endl;
    return;
}

//  Check if audio subsystem is ready
//  If audio subsystem is not ready, wait for it to be ready
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();
}

//  Check the service status again.
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 Voice call session)

// 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;
    audioVoiceStream = std::dynamic_pointer_cast<IAudioVoiceStream>(stream);
}
// Create a voice stream with required configuration
status = audioManager->createStream(config, createStreamCallback);

4. Start the Voice call session

// Implement a response function to get the request status
void startAudioCallback(ErrorCode error)
{
    if (error != ErrorCode::SUCCESS) {
        std::cout << "startAudio() failed with error " << static_cast<int>(error) << std::endl;
        return;
    }
    std::cout << "startAudio() succeeded." << std::endl;
}
// Start the Voice call session
status = audioVoiceStream->startAudio(startAudioCallback);

5. Play a DTMF tone

// Implement a response function to get the request status
void playDtmfCallback(ErrorCode error)
{
    if (error != ErrorCode::SUCCESS) {
        std::cout << "playDtmfTone() failed with error" << static_cast<int>(error) << std::endl;
        return;
    }
    std::cout << "playDtmfTone() succeeded." << std::endl;
}
// Play the DTMF tone with required configuration
status = audioVoiceStream->playDtmfTone(dtmfTone, duration, gain, playDtmfCallback);

6. Stop the Voice call session

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

7. Delete the audio stream associated with the Voice call 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;
    audioVoiceStream->reset();
}
//Delete the Audio Stream
status = audioManager->deleteStream(std::dynamic_pointer_cast<IAudioStream>(audioVoiceStream),
                                deleteStreamCallback);