Dual_Resampler.h
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Dual_Resampler.h
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	// Combination of Fir_Resampler and Blip_Buffer mixing. Used by Sega FM emulators.

	// Game_Music_Emu 0.5.5
	#ifndef DUAL_RESAMPLER_H
	#define DUAL_RESAMPLER_H

	#include "Fir_Resampler.h"
	#include "Blip_Buffer.h"

	class Dual_Resampler {
	public:
	Dual_Resampler();
	virtual ~Dual_Resampler();

	typedef short dsample_t;

	double setup( double oversample, double rolloff, double gain );
	blargg_err_t reset( int max_pairs );
	void resize( int pairs_per_frame );
	void clear();

	void dual_play( long count, dsample_t* out, Blip_Buffer& );

	protected:
	virtual int play_frame( blip_time_t, int pcm_count, dsample_t* pcm_out ) = 0;
	private:

	blargg_vector<dsample_t> sample_buf;
	int sample_buf_size;
	int oversamples_per_frame;
	int buf_pos;
	int resampler_size;

	Fir_Resampler<12> resampler;
	void mix_samples( Blip_Buffer&, dsample_t* );
	void play_frame_( Blip_Buffer&, dsample_t* );
	};

	inline double Dual_Resampler::setup( double oversample, double rolloff, double gain )
	{
	return resampler.time_ratio( oversample, rolloff, gain * 0.5 );
	}

	inline void Dual_Resampler::clear()
	{
	buf_pos = sample_buf_size;
	resampler.clear();
	}

	#endif