100 lines
4.0 KiB
C
100 lines
4.0 KiB
C
#include "../common/sender.h"
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/* fsk modes of transmission */
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enum dsp_mode {
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DSP_MODE_AUDIO, /* stream audio */
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DSP_MODE_SILENCE, /* sending silence */
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DSP_MODE_0, /* send tone 0 */
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DSP_MODE_1, /* send tone 1 */
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DSP_MODE_TELEGRAMM, /* send "Telegramm" */
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};
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/* current state of b-netz sender */
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enum bnetz_state {
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BNETZ_FREI, /* sending 'Gruppenfreisignal' */
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BNETZ_WAHLABRUF, /* sending 'Wahlabruf', receiving call setup */
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BNETZ_SELEKTIVRUF, /* paging phone */
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BNETZ_RUFBESTAETIGUNG, /* waitig for acknowledge from phone */
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BNETZ_RUFHALTUNG, /* phone is ringing */
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BNETZ_GESPRAECH, /* during conversation */
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BNETZ_TRENNEN, /* release of call */
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};
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/* current state of received dialing */
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enum dial_mode {
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DIAL_MODE_START,
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DIAL_MODE_STATIONID,
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DIAL_MODE_NUMBER,
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DIAL_MODE_START2,
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DIAL_MODE_STATIONID2,
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DIAL_MODE_NUMBER2,
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};
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/* current state of paging mobile station */
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enum page_mode {
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PAGE_MODE_NUMBER,
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PAGE_MODE_KANALBEFEHL,
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};
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/* instance of bnetz sender */
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typedef struct bnetz {
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sender_t sender;
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/* system info */
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int gfs; /* 'Gruppenfreisignal' */
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/* switch sender to channel 19 */
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char pilot_file[256]; /* if set, write to given file to switch to channel 19 or back */
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char pilot_on[256]; /* what to write to switch to channel 19 */
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char pilot_off[256]; /* what to write to switch back */
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int pilot_is_on; /* set, if we are on channel 19. also used to switch back on exit */
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/* all bnetz states */
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enum bnetz_state state; /* main state of sender */
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enum dial_mode dial_mode; /* sub state while dialing is received */
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int dial_metering; /* set, if phone supports metering pulses */
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char dial_number[14]; /* dial string received */
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int dial_pos; /* current position while receiving digits */
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char station_id[6]; /* current station ID */
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int station_id_pos; /* position while transmitting */
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enum page_mode page_mode; /* sub state while paging */
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int page_try; /* try number (1 or 2) */
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struct timer timer;
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int trenn_count; /* count number of release messages */
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/* dsp states */
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enum dsp_mode dsp_mode; /* current mode: audio, durable tone 0 or 1, "Telegramm" */
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int fsk_coeff[2]; /* coefficient k = 2*cos(2*PI*f/samplerate), k << 15 */
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int samples_per_bit; /* how many samples lasts one bit */
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int16_t *fsk_filter_spl; /* array with samples_per_bit */
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int fsk_filter_pos; /* current sample position in filter_spl */
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int fsk_filter_step; /* number of samples for each analyzation */
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int fsk_filter_bit; /* last bit, so we detect a bit change */
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int fsk_filter_sample; /* count until it is time to sample bit */
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uint16_t fsk_filter_telegramm; /* rx shift register for receiveing telegramm */
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double fsk_filter_quality[16]; /* quality of each bit in telegramm */
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double fsk_filter_level[16]; /* level of each bit in telegramm */
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int fsk_filter_qualidx; /* index of quality array above */
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int tone_detected; /* what tone has been detected */
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int tone_count; /* how long has that tone been detected */
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double phaseshift256[2]; /* how much the phase of sine wave changes per sample */
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double phase256; /* current phase */
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int telegramm; /* set, if there is a valid telegram */
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int16_t *telegramm_spl; /* 16 * samples_per_bit */
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int telegramm_pos; /* current sample position in telegramm_spl */
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/* loopback test for latency */
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int loopback_count; /* count digits from 0 to 9 */
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double loopback_time[10]; /* time stamp when sending digits 0..9 */
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} bnetz_t;
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double bnetz_kanal2freq(int kanal, int unterband);
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int bnetz_init(void);
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int bnetz_create(const char *sounddev, int samplerate, int pre_emphasis, int de_emphasis, const char *write_wave, const char *read_wave, int kanal, int gfs, int loopback, double loss_volume, const char *pilot);
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void bnetz_destroy(sender_t *sender);
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void bnetz_loss_indication(bnetz_t *bnetz);
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void bnetz_receive_tone(bnetz_t *bnetz, int bit);
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void bnetz_receive_telegramm(bnetz_t *bnetz, uint16_t telegramm, double level, double quality);
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const char *bnetz_get_telegramm(bnetz_t *bnetz);
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