Method LoadAudioFile

samples/common/src/Audio/AudioCapture.cpp:13–51

namespace audio
{
    std::vector<float> AudioCapture::LoadAudioFile(std::string filePath)
    {
        SF_INFO inputSoundFileInfo;
        SNDFILE* infile = nullptr;
        infile = sf_open(filePath.c_str(), SFM_READ, &inputSoundFileInfo);

        float audioIn[inputSoundFileInfo.channels * inputSoundFileInfo.frames];
        sf_read_float(infile, audioIn, inputSoundFileInfo.channels * inputSoundFileInfo.frames);

        float sampleRate = 16000.0f;
        float srcRatio = sampleRate / (float)inputSoundFileInfo.samplerate;
        int outputFrames = ceilf(inputSoundFileInfo.frames * srcRatio);

        // Convert to mono
        std::vector<float> monoData(inputSoundFileInfo.frames);
        for(int i = 0; i < inputSoundFileInfo.frames; i++)
        {
            for(int j = 0; j < inputSoundFileInfo.channels; j++)
                monoData[i] += audioIn[i * inputSoundFileInfo.channels + j];
            monoData[i] /= inputSoundFileInfo.channels;
        }

        // Resample
        SRC_DATA srcData;
        srcData.data_in = monoData.data();
        srcData.input_frames = inputSoundFileInfo.frames;

        std::vector<float> dataOut(outputFrames);
        srcData.data_out = dataOut.data();

        srcData.output_frames = outputFrames;
        srcData.src_ratio = srcRatio;

        src_simple(&srcData, SRC_SINC_BEST_QUALITY, 1);

        sf_close(infile);

        return dataOut;
    }

    void AudioCapture::InitSlidingWindow(float* data, size_t dataSize, int minSamples, size_t stride)
    {