cog/Frameworks/GME/gme/Dual_Resampler.h

// Combination of Fir_Resampler and Stereo_Buffer mixing. Used by Sega FM emulators.

// Game_Music_Emu $vers
#ifndef DUAL_RESAMPLER_H
#define DUAL_RESAMPLER_H

#include "Multi_Buffer.h"

#if GME_VGM_FAST_RESAMPLER
	#include "Downsampler.h"
	typedef Downsampler Dual_Resampler_Downsampler;
#else
	#include "Fir_Resampler.h"
	typedef Fir_Resampler_Norm Dual_Resampler_Downsampler;
#endif

class Dual_Resampler {
public:
	typedef short dsample_t;
	
	blargg_err_t setup( double oversample, double rolloff, double gain );
	double rate() const { return resampler.rate(); }
	blargg_err_t reset( int max_pairs );
	void resize( int pairs_per_frame );
	void clear();
	
    void dual_play( int count, dsample_t out [], Stereo_Buffer&, Stereo_Buffer** secondary_buf_set = NULL, int secondary_buf_set_count = 0 );
	
	blargg_callback<int (*)( void*, blip_time_t, int, dsample_t* )> set_callback;

// Implementation
public:
	Dual_Resampler();
	~Dual_Resampler();

private:
	enum { gain_bits = 14 };
	blargg_vector<dsample_t> sample_buf;
	int sample_buf_size;
	int oversamples_per_frame;
	int buf_pos;
	int buffered;
	int resampler_size;
	int gain_;
	
	Dual_Resampler_Downsampler resampler;
    void mix_samples( Stereo_Buffer&, dsample_t [], int, Stereo_Buffer**, int );
	void mix_mono( Stereo_Buffer&, dsample_t [], int );
	void mix_stereo( Stereo_Buffer&, dsample_t [], int );
	void mix_extra_mono( Stereo_Buffer&, dsample_t [], int );
    void mix_extra_stereo( Stereo_Buffer&, dsample_t [], int );
    int play_frame_( Stereo_Buffer&, dsample_t [], Stereo_Buffer**, int );
};

inline blargg_err_t Dual_Resampler::setup( double oversample, double rolloff, double gain )
{
	gain_ = (int) ((1 << gain_bits) * gain);
	return resampler.set_rate( oversample );
}

#endif