69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
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// Combination of Downsampler and Blip_Buffer mixing. Used by Sega FM emulators.
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// Game_Music_Emu 0.5.5
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#ifndef RESAMPLER_H
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#define RESAMPLER_H
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#include "blargg_config.h"
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#include "multi_buffer.h"
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typedef short dsample_t;
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enum { stereo = 2 };
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enum { max_buf_size = 3960 };
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enum { max_resampler_size = 5942 };
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enum { write_offset = 8 * stereo };
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enum { gain_bits = 14 };
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struct Resampler {
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int (*callback)( void*, blip_time_t, int, dsample_t* );
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void* callback_data;
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dsample_t sample_buf [max_buf_size];
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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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int gain_;
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// Internal resampler
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dsample_t buf [max_resampler_size];
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int buffer_size;
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int write_pos;
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double rate_;
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int pos;
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int step;
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};
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static inline void Resampler_init( struct Resampler* this )
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{
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this->pos = 0;
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this->write_pos = 0;
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this->rate_ = 0;
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}
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blargg_err_t Resampler_reset( struct Resampler* this, int max_pairs );
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void Resampler_resize( struct Resampler* this, int pairs_per_frame );
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void Resampler_play( struct Resampler* this, long count, dsample_t* out, struct Stereo_Buffer* ) ICODE_ATTR;
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static inline void Resampler_set_callback(struct Resampler* this, int (*func)( void*, blip_time_t, int, dsample_t* ), void* user_data )
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{
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this->callback = func;
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this->callback_data = user_data;
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}
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blargg_err_t Resampler_setup( struct Resampler* this, double oversample, double rolloff, double gain );
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static inline void Resampler_clear( struct Resampler* this )
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{
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this->buf_pos = this->sample_buf_size;
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this->pos = 0;
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this->write_pos = 0;
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}
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#endif
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