Dual_Resampler.h

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// Combination of Fir_Resampler and Blip_Buffer mixing. Used by Sega FM emulators.
 
// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
#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