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#ifndef YM2612_H_
#define YM2612_H_
#include <stdint.h>
#include <stdio.h>
#define NUM_PART_REGS (0xB7-0x30)
#define NUM_CHANNELS 6
#define NUM_OPERATORS (4*NUM_CHANNELS)
#define YM_OPT_WAVE_LOG 1
typedef struct {
uint32_t phase_inc;
uint32_t phase_counter;
uint16_t envelope;
int16_t output;
uint16_t total_level;
uint16_t sustain_level;
uint8_t rates[4];
uint8_t key_scaling;
uint8_t multiple;
uint8_t detune;
uint8_t env_phase;
} ym_operator;
typedef struct {
FILE * logfile;
uint16_t fnum;
int16_t output;
uint8_t block_fnum_latch;
uint8_t block;
uint8_t keycode;
uint8_t algorithm;
uint8_t feedback;
uint8_t ams;
uint8_t pms;
uint8_t lr;
} ym_channel;
typedef struct {
uint16_t fnum;
uint8_t block;
uint8_t block_fnum_latch;
uint8_t keycode;
} ym_supp;
#define YM_PART1_START 0x21
#define YM_PART2_START 0x30
#define YM_REG_END 0xB8
#define YM_PART1_REGS (YM_REG_END-YM_PART1_START)
#define YM_PART2_REGS (YM_REG_END-YM_PART2_START)
typedef struct {
int16_t *audio_buffer;
int16_t *back_buffer;
double buffer_fraction;
double buffer_inc;
uint32_t clock_inc;
uint32_t buffer_pos;
uint32_t sample_limit;
uint32_t current_cycle;
uint32_t write_cycle;
ym_operator operators[NUM_OPERATORS];
ym_channel channels[NUM_CHANNELS];
uint16_t timer_a;
uint16_t timer_a_load;
uint16_t timer_b;
uint16_t timer_b_load;
uint16_t env_counter;
ym_supp ch3_supp[3];
uint8_t ch3_mode;
uint8_t current_op;
uint8_t current_env_op;
uint8_t timer_control;
uint8_t dac_enable;
uint8_t lfo_enable;
uint8_t lfo_freq;
uint8_t lfo_counter;
uint8_t lfo_am_step;
uint8_t lfo_pm_step;
uint8_t status;
uint8_t selected_reg;
uint8_t selected_part;
uint8_t part1_regs[YM_PART1_REGS];
uint8_t part2_regs[YM_PART2_REGS];
} ym2612_context;
void ym_init(ym2612_context * context, uint32_t sample_rate, uint32_t master_clock, uint32_t clock_div, uint32_t sample_limit, uint32_t options);
void ym_run(ym2612_context * context, uint32_t to_cycle);
void ym_address_write_part1(ym2612_context * context, uint8_t address);
void ym_address_write_part2(ym2612_context * context, uint8_t address);
void ym_data_write(ym2612_context * context, uint8_t value);
uint8_t ym_read_status(ym2612_context * context);
uint8_t ym_load_gst(ym2612_context * context, FILE * gstfile);
uint8_t ym_save_gst(ym2612_context * context, FILE * gstfile);
#endif //YM2612_H_
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