testFormantShifter

testFormantShifter.cpp

void testFormantShifter() {

    AudioFile<float> audioFile, audioFileReference, audioFileResult;
    string filename = "../" + std::string("test1") + ".wav";
    string filenameResult = "../" + std::string("formantResult") + ".wav";
    audioFile.load(filename);

    auto& audioFrames = audioFile.samples;

    const int channels = audioFrames.size();  // the number of channels is determined by the size of audioFrames
    const int samplerate = 44100;  // assuming CD quality sound

    SMP::FormantShifter shifter(channels, samplerate);

    // Set the frequency ratio (as needed)
    double freqRatio = 1.0;  // set to desired value
    shifter.setFrequencyRatio(freqRatio);

    // The chunk size
    const int chunkSize = 2048 + 512;

    // Creating pointers to the channels
    std::vector<const float*> channelPointers(channels);

    // Process audio frames
    for (size_t i = 0; i < audioFrames[0].size(); i += chunkSize) {
        // Ensuring that the frame size is a multiple of chunkSize
        if (audioFrames[0].size() - i < chunkSize) {
            break;
        }

        // Setting up the input pointers for this chunk
        for (int ch = 0; ch < channels; ++ch) {
            channelPointers[ch] = &audioFrames[ch][i];
        }

        // Creating output for this chunk
        std::vector<std::vector<float>> outputChunk(channels, std::vector<float>(chunkSize, 0.0f));

        // Processing this chunk
        shifter.process(channelPointers.data(), chunkSize, outputChunk);

        // Replacing original data with processed data
        for (int ch = 0; ch < channels; ++ch) {
            std::copy(outputChunk[ch].begin(), outputChunk[ch].end(), &audioFrames[ch][i]);
        }
    }

    audioFile.save(filenameResult);
}