/home/dave/git/tegmen/src/tegmen.h

Encode a message into FT8 audio samples.

Encode a message into FT8 audio samplesEncodes a text message into FT8 audio samples at 12 kHz sample rate. The output is a float array suitable for conversion to int16 PCM audio.

Parameters

message	Input message string (max 37 chars, null-terminated)
samples	Output buffer for audio samples (must be at least 151680 elements)
nsamples	Output parameter - number of samples generated (typically 151680)

Returns

TEGMEN_SUCCESS on success, error code on failure

Note

The message must be a valid FT8 message format (e.g., "CQ W4HO DN70")

Generated samples are at baseband (0-3000 Hz range)

Sample rate is always TEGMEN_SAMPLE_RATE (12000 Hz)

float samples[151680];
int nsamples = 0;
if (tegmen_ft8_encode("CQ W4HO DN70", samples, &nsamples) == TEGMEN_SUCCESS) {
    printf("Encoded %d samples\n", nsamples);
}

 
#ifndef TEGMEN_H
#define TEGMEN_H
 
#include <stdint.h>
#include <stddef.h>
 
#ifdef __cplusplus
extern "C" {
#endif


#define TEGMEN_SUCCESS 0
#define TEGMEN_ERROR_INVALID_MESSAGE -1
#define TEGMEN_ERROR_ENCODING_FAILED -2
#define TEGMEN_ERROR_DECODING_FAILED -3
#define TEGMEN_ERROR_INVALID_PARAMETERS -4



#define TEGMEN_SAMPLE_RATE 12000

#define TEGMEN_FT8_MESSAGE_LEN 37

#define TEGMEN_FT4_MESSAGE_LEN 37



typedef void (*tegmen_decode_callback_t)(
    float sync,      
    int snr,         
    float dt,        
    float freq,      
    const char* decoded,  
    int nap,         
    float qual,      
    void* user_data  
);



int tegmen_ft8_encode(const char* message, float* samples, int* nsamples);

int tegmen_ft8_decode(const int16_t* samples, int nsamples,
                     tegmen_decode_callback_t callback, void* user_data);

int tegmen_ft4_encode(const char* message, float* samples, int* nsamples);

int tegmen_ft4_decode(const int16_t* samples, int nsamples,
                      tegmen_decode_callback_t callback, void* user_data);

 
#ifdef __cplusplus
}
#endif
 
#endif /* TEGMEN_H */