Method process

src/internal/src/DynamicsCompressor.cpp:106–214

}

void DynamicsCompressor::process(ContextRenderLock & r, const AudioBus * sourceBus, AudioBus * destinationBus, int bufferSize, int offset, int count)
{
    int numberOfDestChannels = destinationBus->numberOfChannels();
    int numberOfSourceChannels = sourceBus->numberOfChannels();

    if (!numberOfSourceChannels)
    {
        destinationBus->zero();
        return;
    }

    if (numberOfDestChannels != m_numberOfChannels)
    {
        setNumberOfChannels(numberOfSourceChannels);
        numberOfDestChannels = numberOfSourceChannels;
        for (int i = 0; i < numberOfDestChannels; ++i)
        {
            m_sourceChannels[i] = sourceBus->channel(i)->data();
            m_destinationChannels[i] = destinationBus->channel(i)->mutableData();
        }
    }

    for (int i = 0; i < numberOfDestChannels; ++i)
    {
        m_sourceChannels[i] = sourceBus->channel(i)->data();
        m_destinationChannels[i] = destinationBus->channel(i)->mutableData();
    }

    float filterStageGain = parameterValue(ParamFilterStageGain);
    float filterStageRatio = parameterValue(ParamFilterStageRatio);
    float anchor = parameterValue(ParamFilterAnchor);

    if (filterStageGain != m_lastFilterStageGain || filterStageRatio != m_lastFilterStageRatio || anchor != m_lastAnchor)
    {
        m_lastFilterStageGain = filterStageGain;
        m_lastFilterStageRatio = filterStageRatio;
        m_lastAnchor = anchor;

        setEmphasisParameters(filterStageGain, anchor, filterStageRatio);
    }

    // Apply pre-emphasis filter.
    // Note that the final three stages are computed in-place in the destination buffer.
    for (int i = 0; i < numberOfDestChannels; ++i)
    {
        const float * sourceData = m_sourceChannels[i];
        float * destinationData = m_destinationChannels[i];
        ZeroPole * preFilters = m_preFilterPacks[i]->filters;

        preFilters[0].process(sourceData, destinationData, bufferSize, offset, count);
        preFilters[1].process(destinationData, destinationData, bufferSize, offset, count);
        preFilters[2].process(destinationData, destinationData, bufferSize, offset, count);
        preFilters[3].process(destinationData, destinationData, bufferSize, offset, count);
    }

    float dbThreshold = parameterValue(ParamThreshold);
    float dbKnee = parameterValue(ParamKnee);
    float ratio = parameterValue(ParamRatio);