62 lines
1.7 KiB
C++
62 lines
1.7 KiB
C++
// Combination of Fir_Resampler and Stereo_Buffer mixing. Used by Sega FM emulators.
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// Game_Music_Emu $vers
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#ifndef DUAL_RESAMPLER_H
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#define DUAL_RESAMPLER_H
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#include "Multi_Buffer.h"
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#if GME_VGM_FAST_RESAMPLER
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#include "Downsampler.h"
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typedef Downsampler Dual_Resampler_Downsampler;
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#else
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#include "Fir_Resampler.h"
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typedef Fir_Resampler_Norm Dual_Resampler_Downsampler;
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#endif
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class Dual_Resampler {
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public:
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typedef short dsample_t;
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blargg_err_t setup( double oversample, double rolloff, double gain );
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double rate() const { return resampler.rate(); }
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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( int count, dsample_t out [], Stereo_Buffer&, Stereo_Buffer** secondary_buf_set = NULL, int secondary_buf_set_count = 0 );
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blargg_callback<int (*)( void*, blip_time_t, int, dsample_t* )> set_callback;
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// Implementation
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public:
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Dual_Resampler();
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~Dual_Resampler();
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private:
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enum { gain_bits = 14 };
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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 buffered;
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int resampler_size;
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int gain_;
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Dual_Resampler_Downsampler resampler;
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void mix_samples( Stereo_Buffer&, dsample_t [], int, Stereo_Buffer**, int );
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void mix_mono( Stereo_Buffer&, dsample_t [], int );
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void mix_stereo( Stereo_Buffer&, dsample_t [], int );
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void mix_extra_mono( Stereo_Buffer&, dsample_t [], int );
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void mix_extra_stereo( Stereo_Buffer&, dsample_t [], int );
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int play_frame_( Stereo_Buffer&, dsample_t [], Stereo_Buffer**, int );
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};
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inline blargg_err_t Dual_Resampler::setup( double oversample, double rolloff, double gain )
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{
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gain_ = (int) ((1 << gain_bits) * gain);
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return resampler.set_rate( oversample );
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}
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#endif
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