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50 lines
1.2 KiB
C++
50 lines
1.2 KiB
C++
// Combination of Fir_Resampler and Blip_Buffer mixing. Used by Sega FM emulators.
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// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
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#ifndef DUAL_RESAMPLER_H
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#define DUAL_RESAMPLER_H
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#include "Fir_Resampler.h"
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#include "Blip_Buffer.h"
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class Dual_Resampler {
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public:
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Dual_Resampler();
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virtual ~Dual_Resampler();
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typedef short dsample_t;
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double setup( double oversample, double rolloff, double gain );
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blargg_err_t reset( int max_pairs );
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void resize( int pairs_per_frame );
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void clear();
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void dual_play( long count, dsample_t* out, Blip_Buffer& );
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protected:
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virtual int play_frame( blip_time_t, int pcm_count, dsample_t* pcm_out ) = 0;
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private:
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blargg_vector<dsample_t> sample_buf;
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int sample_buf_size;
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int oversamples_per_frame;
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int buf_pos;
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int resampler_size;
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Fir_Resampler<12> resampler;
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void mix_samples( Blip_Buffer&, dsample_t* );
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void play_frame_( Blip_Buffer&, dsample_t* );
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};
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inline double Dual_Resampler::setup( double oversample, double rolloff, double gain )
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{
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return resampler.time_ratio( oversample, rolloff, gain * 0.5 );
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}
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inline void Dual_Resampler::clear()
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{
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buf_pos = sample_buf_size;
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resampler.clear();
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}
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#endif
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