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* libscopehal v0.1                                                                                                     *
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/**
	@file
	@author Andrew D. Zonenberg
	@brief Declaration of TestWaveformSource
 */

#ifndef TestWaveformSource_h
#define TestWaveformSource_h

#include "../scopehal/AlignedAllocator.h"
#include <ffts.h>
#include <random>

/**
	@brief Helper class for generating test waveforms

	Used by DemoOscilloscope as well as various unit tests etc.
 */
class TestWaveformSource
{
public:
	TestWaveformSource(std::mt19937& rng);
	virtual ~TestWaveformSource();

	TestWaveformSource(const TestWaveformSource&) =delete;
	TestWaveformSource& operator=(const TestWaveformSource&) =delete;

	WaveformBase* GenerateNoisySinewave(
		float amplitude,
		float startphase,
		float period,
		int64_t sampleperiod,
		size_t depth,
		float noise_amplitude = 0.01);

	WaveformBase* GenerateNoisySinewaveMix(
		float amplitude,
		float startphase1,
		float startphase2,
		float period1,
		float period2,
		int64_t sampleperiod,
		size_t depth,
		float noise_amplitude = 0.01);

	WaveformBase* GeneratePRBS31(
		float amplitude,
		float period,
		int64_t sampleperiod,
		size_t depth,
		bool lpf = true,
		float noise_amplitude = 0.01);

	WaveformBase* Generate8b10b(
		float amplitude,
		float period,
		int64_t sampleperiod,
		size_t depth,
		bool lpf = true,
		float noise_amplitude = 0.01);

	WaveformBase* GenerateStep(
		float vlo,
		float vhi,
		int64_t sampleperiod,
		size_t depth);

	void DegradeSerialData(AnalogWaveform* cap, int64_t sampleperiod, size_t depth, bool lpf, float noise_amplitude);

protected:
	std::mt19937& m_rng;

	//FFT stuff
	AlignedAllocator<float, 32> m_allocator;
	ffts_plan_t* m_forwardPlan;
	ffts_plan_t* m_reversePlan;
	size_t m_cachedNumPoints;
	size_t m_cachedRawSize;

	float* m_forwardInBuf;
	float* m_forwardOutBuf;
	float* m_reverseOutBuf;
};

#endif
