pulseshape.h

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#ifndef _SSTVENC_PULSESHAPE_H
#define _SSTVENC_PULSESHAPE_H
 
/*
 * © Stuart Longland VK4MSL
 * SPDX-License-Identifier: MIT
 */
 
#include <libsstvenc/timescale.h>
#include <math.h>
#include <stddef.h>
#include <stdint.h>
 
/* Forward declaration */
struct sstvenc_oscillator;
 
#define SSTVENC_PS_PHASE_INIT    (0)
 
#define SSTVENC_PS_PHASE_RISE    (1)
 
#define SSTVENC_PS_PHASE_HOLD    (2)
 
#define SSTVENC_PS_PHASE_FALL    (3)
 
#define SSTVENC_PS_PHASE_DONE    (4)
#define SSTVENC_PS_HOLD_TIME_INF SSTVENC_TS_INFINITE
 
struct sstvenc_pulseshape {
        double   amplitude;
        double   output;
        uint32_t sample_rate;
        uint32_t sample_idx;
        uint32_t hold_sz;
        uint16_t rise_sz;
        uint16_t fall_sz;
        uint8_t  phase;
};
 
void   sstvenc_ps_reset_samples(struct sstvenc_pulseshape* const ps,
                                uint32_t                         hold_time);
 
void   sstvenc_ps_reset(struct sstvenc_pulseshape* const ps, double hold_time,
                        uint8_t time_unit);
 
void   sstvenc_ps_init(struct sstvenc_pulseshape* const ps, double amplitude,
                       double rise_time, double hold_time, double fall_time,
                       uint32_t sample_rate, uint8_t time_unit);
 
void   sstvenc_ps_advance(struct sstvenc_pulseshape* const ps);
 
void   sstvenc_ps_compute(struct sstvenc_pulseshape* const ps);
 
size_t sstvenc_psosc_fill_buffer(struct sstvenc_pulseshape* const ps,
                                 struct sstvenc_oscillator* const osc,
                                 double* buffer, size_t buffer_sz);
 
#endif