Method processStereoToMono

src/core/Resampler.cpp:51–79

}

QByteArray Resampler::processStereoToMono(const float* stereoIn, int numStereoFrames)
{
    if (numStereoFrames <= 0) return {};

    if (numStereoFrames > m_maxBlockSamples) {
        QByteArray result;
        for (int offset = 0; offset < numStereoFrames; offset += m_maxBlockSamples)
            result.append(processStereoToMono(stereoIn + offset * 2, std::min(numStereoFrames - offset, m_maxBlockSamples)));
        return result;
    }

    // Downmix stereo → mono
    m_inBuf.resize(numStereoFrames);
    for (int i = 0; i < numStereoFrames; ++i)
        m_inBuf[i] = (stereoIn[2 * i] + stereoIn[2 * i + 1]) * 0.5;

    // Resample
    double* outPtr = nullptr;
    int outLen = m_resampler->process(m_inBuf.data(), numStereoFrames, outPtr);

    if (outLen <= 0 || !outPtr) return {};

    // Convert double → float32 mono
    QByteArray result(outLen * static_cast<int>(sizeof(float)), Qt::Uninitialized);
    auto* dst = reinterpret_cast<float*>(result.data());
    for (int i = 0; i < outLen; ++i)
        dst[i] = static_cast<float>(outPtr[i]);
    return result;
}

QByteArray Resampler::processMonoToStereo(const float* monoIn, int numSamples)
{