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#ifdef HAVE_ALSA
#include "../libsound/sound.h"
#endif
#ifdef HAVE_SDR
#include "../libsdr/sdr.h"
#endif
#include "../libwave/wave.h"
#include "../libsamplerate/samplerate.h"
#include "../libjitter/jitter.h"
#include "../libemphasis/emphasis.h"
#include "../libdisplay/display.h"
#define MAX_SENDER 16
/* how to send a 'paging' signal (trigger transmitter) */
enum paging_signal {
PAGING_SIGNAL_NONE = 0,
PAGING_SIGNAL_TONE,
PAGING_SIGNAL_NOTONE,
PAGING_SIGNAL_POSITIVE,
PAGING_SIGNAL_NEGATIVE,
};
/* common structure of each transmitter */
typedef struct sender {
struct sender *next;
struct sender *slave; /* points to 'slave' that uses next channel of audio device */
struct sender *master; /* if set, the audio device is owned by 'master' */
/* system info */
const char *kanal; /* channel number */
double sendefrequenz; /* transmitter frequency */
double empfangsfrequenz; /* receiver frequency */
double ruffrequenz; /* special paging frequency used for B-Netz */
/* FM/AM levels */
int am; /* use AM instead of FM */
double max_deviation; /* max frequency deviation / level */
double max_modulation; /* max frequency modulated */
double speech_deviation; /* deviation / level of 1000 Hz reference tone at speech level */
double modulation_index; /* AM modulation index */
double max_display; /* level of displaying wave form */
/* audio */
void *audio;
char audiodev[64]; /* audio device name (alsa or sdr) */
void *(*audio_open)(const char *, double *, double *, int *, int, double, int, int, double, double, double);
int (*audio_start)(void *);
void (*audio_close)(void *);
int (*audio_write)(void *, sample_t **, uint8_t **, int, enum paging_signal *, int *, int);
int (*audio_read)(void *, sample_t **, int, int, double *);
int (*audio_get_tosend)(void *, int);
int samplerate;
samplerate_t srstate; /* sample rate conversion state */
double rx_gain; /* factor of level to apply on rx samples */
int pre_emphasis; /* use pre_emhasis, done by sender */
int de_emphasis; /* use de_emhasis, done by sender */
emphasis_t estate; /* pre and de emphasis */
/* loopback test */
int loopback; /* 0 = off, 1 = internal, 2 = external */
/* record and playback */
const char *write_rx_wave; /* file name pointers */
const char *write_tx_wave;
const char *read_rx_wave;
const char *read_tx_wave;
wave_rec_t wave_rx_rec; /* wave recording (from rx) */
wave_rec_t wave_tx_rec; /* wave recording (from tx) */
wave_play_t wave_rx_play; /* wave playback (as rx) */
wave_play_t wave_tx_play; /* wave playback (as tx) */
/* audio buffer for audio to send to transmitter (also used as loopback buffer) */
jitter_t dejitter;
/* audio buffer for audio to send to caller (20ms = 160 samples @ 8000Hz) */
sample_t rxbuf[160];
int rxbuf_pos; /* current fill of buffer */
/* paging tone */
enum paging_signal paging_signal; /* if paging signal is used and how it is performed */
int paging_on; /* 1 or 0 for on or off */
/* display wave */
dispwav_t dispwav; /* display wave form */
/* display measurements */
dispmeas_t dispmeas; /* display measurements */
} sender_t;
extern sender_t *sender_head;
extern int cant_recover;
extern int check_channel;
int sender_create(sender_t *sender, const char *kanal, double sendefrequenz, double empfangsfrequenz, const char *audiodev, int use_sdr, int samplerate, double rx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, enum paging_signal paging_signal);
void sender_destroy(sender_t *sender);
void sender_set_fm(sender_t *sender, double max_deviation, double max_modulation, double speech_deviation, double max_display);
void sender_set_am(sender_t *sender, double max_modulation, double speech_deviation, double max_display, double modulation_index);
int sender_open_audio(int latspl);
int sender_start_audio(void);
void process_sender_audio(sender_t *sender, int *quit, int latspl);
void sender_send(sender_t *sender, sample_t *samples, uint8_t *power, int count);
void sender_receive(sender_t *sender, sample_t *samples, int count, double rf_level_db);
void sender_paging(sender_t *sender, int on);
sender_t *get_sender_by_empfangsfrequenz(double freq);
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