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