FFTFilter.h

Go to the documentation of this file.

/***********************************************************************************************************************
*                                                                                                                      *
* libscopeprotocols                                                                                                    *
*                                                                                                                      *
* Copyright (c) 2012-2026 Andrew D. Zonenberg and contributors                                                         *
* All rights reserved.                                                                                                 *
*                                                                                                                      *
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the     *
* following conditions are met:                                                                                        *
*                                                                                                                      *
*    * Redistributions of source code must retain the above copyright notice, this list of conditions, and the         *
*      following disclaimer.                                                                                           *
*                                                                                                                      *
*    * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the       *
*      following disclaimer in the documentation and/or other materials provided with the distribution.                *
*                                                                                                                      *
*    * Neither the name of the author nor the names of any contributors may be used to endorse or promote products     *
*      derived from this software without specific prior written permission.                                           *
*                                                                                                                      *
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED   *
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL *
* THE AUTHORS BE HELD LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES        *
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR       *
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT *
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE       *
* POSSIBILITY OF SUCH DAMAGE.                                                                                          *
*                                                                                                                      *
***********************************************************************************************************************/
 
#ifndef FFTFilter_h
#define FFTFilter_h
 
#include "VulkanFFTPlan.h"
 
class QueueHandle;
 
struct ComplexToMagnitudeArgs
{
    uint32_t npoints;
    float scale;
};
 
class FFTFilter : public PeakDetectionFilter
{
public:
    FFTFilter(const std::string& color);
    virtual ~FFTFilter();
 
    virtual void Refresh(vk::raii::CommandBuffer& cmdBuf, std::shared_ptr<QueueHandle> queue) override;
    virtual uint32_t GetExecutionCapabilitiesMask() override;
 
    static std::string GetProtocolName();
 
    virtual float GetVoltageRange(size_t stream) override;
    virtual float GetOffset(size_t stream) override;
 
    virtual void SetVoltageRange(float range, size_t stream) override;
    virtual void SetOffset(float offset, size_t stream) override;
 
    enum WindowFunction
    {
        WINDOW_RECTANGULAR,
        WINDOW_HANN,
        WINDOW_HAMMING,
        WINDOW_BLACKMAN_HARRIS
    };
 
    PROTOCOL_DECODER_INITPROC(FFTFilter)
 
    void SetWindowFunction(WindowFunction f)
    { m_parameters[m_windowName].SetIntVal(f); }
 
    //Accessors for internal values only used by unit tests
    //TODO: refactor this into a friend class or something?
    size_t test_GetNumPoints()
    { return m_cachedNumPointsFFT; }
 
    size_t test_GetNumOuts()
    { return m_cachedNumOuts; }
 
protected:
 
    void ReallocateBuffers(size_t npoints_raw, size_t npoints, size_t nouts);
 
    void DoRefresh(
        WaveformBase* din,
        AcceleratorBuffer<float>& data,
        double fs_per_sample,
        size_t npoints,
        size_t nouts,
        bool log_output,
        vk::raii::CommandBuffer& cmdBuf,
        std::shared_ptr<QueueHandle> queue
        );
 
    size_t m_cachedNumPoints;
    size_t m_cachedNumPointsFFT;
    size_t m_cachedNumOuts;
    AcceleratorBuffer<float> m_rdinbuf;
    AcceleratorBuffer<float> m_rdoutbuf;
 
    float m_range;
    float m_offset;
 
    std::string m_windowName;
 
    std::unique_ptr<VulkanFFTPlan> m_vkPlan;
 
    ComputePipeline m_blackmanHarrisComputePipeline;
    ComputePipeline m_rectangularComputePipeline;
    ComputePipeline m_cosineSumComputePipeline;
    ComputePipeline m_complexToMagnitudeComputePipeline;
    ComputePipeline m_complexToLogMagnitudeComputePipeline;
};
 
#endif