hart_impulse.hpp

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#pragma once
 
#include "signals/hart_signal.hpp"
#include "hart_utils.hpp"
 
namespace hart
{
 
/// @brief Produces a {1, 0, 0, 0, ...} sequence
/// @ingroup Signals
template<typename SampleType>
class Impulse:
    public Signal<SampleType, Impulse<SampleType>>
{
public:
    /// @brief Creates an impulse signal instance
    Impulse() = default;
 
    void prepare (double /* sampleRateHz */, size_t /* numOutputChannels */, size_t /*maxBlockSizeFrames*/) override {}
 
    void renderNextBlock (AudioBuffer<SampleType>& output) override
    {
        if (output.getNumChannels() == 0 || output.getNumFrames() == 0)
            return;
 
        output.clear();
 
        if (m_impulseWasAlreadyRendered)
            return;
 
        for (size_t channel = 0; channel < output.getNumChannels(); ++channel)
            output[channel][0] = (SampleType) 1;
 
        m_impulseWasAlreadyRendered = true;
    }
 
    void reset() override
    {
        m_impulseWasAlreadyRendered = false;
    }
 
    HART_DEFINE_GENERIC_REPRESENT (Impulse);
 
private:
    bool m_impulseWasAlreadyRendered = false;
};
 
HART_SIGNAL_DECLARE_ALIASES_FOR (Impulse)
 
}  // namespace hart