cw.h

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#ifndef _SSTVENC_CW_H
#define _SSTVENC_CW_H
 
/*
 * © Stuart Longland VK4MSL
 * SPDX-License-Identifier: MIT
 */
 
#include <libsstvenc/oscillator.h>
#include <libsstvenc/pulseshape.h>
#include <libsstvenc/timescale.h>
#include <stddef.h>
#include <stdint.h>
 
/* Forward declaration of CW pair type, for internal use. */
struct sstvenc_cw_pair;
 
#define SSTVENC_CW_MOD_STATE_INIT     (0)
 
#define SSTVENC_CW_MOD_STATE_NEXT_SYM (1)
 
#define SSTVENC_CW_MOD_STATE_MARK     (2)
 
#define SSTVENC_CW_MOD_STATE_DITSPACE (3)
 
#define SSTVENC_CW_MOD_STATE_DAHSPACE (4)
 
#define SSTVENC_CW_MOD_STATE_DONE     (5)
 
struct sstvenc_cw_mod {
        double                        output;
 
        const char*                   text_string;
 
        const struct sstvenc_cw_pair* symbol;
 
        struct sstvenc_oscillator     osc;
 
        struct sstvenc_pulseshape     ps;
 
        uint16_t                      dit_period;
 
        uint8_t                       state;
 
        uint8_t                       pos;
};
 
void   sstvenc_cw_init(struct sstvenc_cw_mod* const cw, const char* text,
                       double amplitude, double frequency, double dit_period,
                       double slope_period, uint32_t sample_rate,
                       uint8_t time_unit);
 
void   sstvenc_cw_compute(struct sstvenc_cw_mod* const cw);
 
size_t sstvenc_cw_fill_buffer(struct sstvenc_cw_mod* const cw, double* buffer,
                              size_t buffer_sz);
 
#endif