ptttl_sample_generator.h

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#ifndef PTTTL_SAMPLE_GENERATOR_H
#define PTTTL_SAMPLE_GENERATOR_H
 
 
#include <stdint.h>
#include "ptttl_parser.h"
 
 
#ifdef __cplusplus
    extern "C" {
#endif
 
 
#ifndef PTTTL_SAMPLE_GENERATOR_NUM_HARMONICS
#define PTTTL_SAMPLE_GENERATOR_NUM_HARMONICS 16
#endif // PTTTL_SAMPLE_GENERATOR_NUM_HARMONICS
 
#define PTTTL_SAMPLE_GENERATOR_CONFIG_DEFAULT {.sample_rate=44100u, .attack_samples=100u, \
                                               .decay_samples=500u, .amplitude=0.8f}
 
 
typedef enum
{
    WAVEFORM_TYPE_SINE = 0,  
    WAVEFORM_TYPE_TRIANGLE,  
    WAVEFORM_TYPE_SAWTOOTH,  
    WAVEFORM_TYPE_SQUARE,    
    WAVEFORM_TYPE_COUNT
} ptttl_waveform_type_e;
 
 
typedef float (*ptttl_waveform_generator_t)(float x, float p, unsigned int s);
 
 
typedef struct
{
    ptttl_waveform_generator_t wgen; 
    uint32_t vibrato_frequency;      
    uint32_t vibrato_variance;       
    unsigned int sine_index;         
    unsigned int start_sample;       
    unsigned int num_samples;        
    unsigned int attack;             
    unsigned int decay;              
    unsigned int note_number;        
    float pitch_hz;                  
    float phasor_state;              
} ptttl_note_stream_t;
 
typedef struct
{
    unsigned int sample_rate;     
    unsigned int attack_samples;  
    unsigned int decay_samples;   
    float amplitude;              
} ptttl_sample_generator_config_t;
 
typedef struct
{
    unsigned int current_sample;
    ptttl_note_stream_t note_streams[PTTTL_MAX_CHANNELS_PER_FILE];
    uint8_t channel_finished[PTTTL_MAX_CHANNELS_PER_FILE];
    ptttl_sample_generator_config_t config;
    ptttl_parser_t *parser;
} ptttl_sample_generator_t;
 
 
int ptttl_sample_generator_create(ptttl_parser_t *parser, ptttl_sample_generator_t *generator,
                                  ptttl_sample_generator_config_t *config);
 
int ptttl_sample_generator_set_waveform(ptttl_sample_generator_t *generator,
                                        uint32_t channel, ptttl_waveform_type_e type);
 
int ptttl_sample_generator_set_custom_waveform(ptttl_sample_generator_t *generator,
                                               uint32_t channel, ptttl_waveform_generator_t wgen);
 
int ptttl_sample_generator_generate(ptttl_sample_generator_t *generator,
                                    uint32_t *num_samples, int16_t *samples);
 
 
#ifdef __cplusplus
    }
#endif
 
#endif // PTTTL_SAMPLE_GENERATOR_H