C++ integration?

Hey, I wanted to use this in a c++ program, I can include the headers but have no idea how to link the dll. I’ve tried to look how to link it using CMake for a couple of days now with no success. I get C:/Users/tatan/CLionProjects/TreeVoiceAssistant/HotwordDetection.cpp:27: undefined reference to pv_porcupine_process(pv_porcupine_object*, short const*, bool*)'` every single time. I’m using CLion as you can probably see, with MINGW and I can sucessfuly include the headers, but dlls just won’t.

Please help

[veeableful]

Hi @dimeldo, sorry I didn’t see this sooner! I’ve created a simple example that demonstrate the usage of microphone and Porcupine in Qt. You can see it here.

[veeableful]

@tatanpoker09 The way I do it is I buffer the audio data from microphone and process them with Porcupine once they are at least the size of Porcupine’s frame length. The result should be continuous.

In my case, I use Qt so mAudioDataBuffer is a QByteArray.

Snippet:

// Check if we have enough bytes of audio data for Porcupine to work with
bool PorcupineWaker::hasEnoughSamples(int porcupineFrameLength) const
{
    // We use porcupineFrameLength * 2 because frame length type is int16_t while mAudioDataBuffer's type is byte
    return mAudioDataBuffer.size() >= porcupineFrameLength * 2;
}

// Go through the audio data and detect the wake word if there's any
void PorcupineWaker::processSamples(int porcupineFrameLength)
{
    while (hasEnoughSamples(porcupineFrameLength)) {
        const int16_t *audioData = reinterpret_cast<int16_t*>(mAudioDataBuffer.data());
        bool detected = false;

        pv_porcupine_process(mPorcupineObject, &audioData[0], &detected);
        if (detected) {
            // Detected keyword. Do something!
            emit awake();
        }

        // Remove the audio data that we have processed
        mAudioDataBuffer.remove(0, porcupineFrameLength * 2);
    }
}

// Listen to the microphone's audio data and look for the keyword
void PorcupineWaker::listen(const QByteArray &input)
{
    const int porcupineFrameLength = pv_porcupine_frame_length();

    mAudioDataBuffer.append(input);
    processSamples(porcupineFrameLength);
}