156 lines
7.3 KiB
C
156 lines
7.3 KiB
C
#include "../libcompandor/compandor.h"
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#include "../libtimer/timer.h"
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#include "../libmobile/sender.h"
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#include "../libscrambler/scrambler.h"
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typedef struct cnetz cnetz_t;
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#include "fsk_demod.h"
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#include "transaction.h"
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#define CNETZ_OGK_KANAL 131
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/* dsp modes of transmission */
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enum dsp_mode {
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DSP_SCHED_NONE = 0, /* use for scheduling: nothing to schedule */
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DSP_MODE_OFF, /* send nothing on unused SpK */
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DSP_MODE_OGK, /* send "Telegramm" on OgK */
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DSP_MODE_SPK_K, /* send concentrated "Telegramm" SpK */
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DSP_MODE_SPK_V, /* send distributed "Telegramm" SpK */
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};
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enum cnetz_chan_type {
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CHAN_TYPE_OGK, /* pure standard organization channel (channel 131) */
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CHAN_TYPE_SPK, /* pure traffic channel */
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CHAN_TYPE_OGK_SPK, /* combined OGK + SPK; note: some phones may reject SPK on channel 131 */
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};
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/* current state of c-netz sender */
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enum cnetz_state {
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CNETZ_NULL, /* before power on */
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CNETZ_IDLE, /* broadcasting LR/MLR on Ogk */
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CNETZ_BUSY, /* currently processing a call, no other transaction allowed */
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};
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/* timers */
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#define F_BQ 8 /* number of not received frames at BQ state */
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#define F_VHQK 16 /* number of not received frames at VHQ state during concentrated signaling */
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#define F_VHQ 16 /* number of not received frames at VHQ state during distributed signaling */
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#define F_ZFZ 16 /* number of not received frames at ZFZ state (guessed, no documentation avail) */
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#define F_DS 16 /* number of not received frames at DS state */
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#define F_RTA 16 /* number of not received frames at RTA state */
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#define N_AFKT 6 /* number of release frames to send during concentrated signaling */
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#define N_AFV 4 /* number of release frames to send during distributed signaling */
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#define N 3 /* now many times we repeat a message on OgK */
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#define T_VAG2 180 /* time on outgoing queue */
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#define T_VAK 60 /* time on incoming queue */
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#define T_AP 750 /* Time to wait for SIM card's authentication reply */
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/* clear causes */
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#define CNETZ_CAUSE_GASSENBESETZT 0 /* network congested */
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#define CNETZ_CAUSE_TEILNEHMERBESETZT 1 /* subscriber busy */
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#define CNETZ_CAUSE_FUNKTECHNISCH 2 /* radio transmission fault */
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struct cnetz;
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struct telegramm;
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struct clock_speed {
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double meas_ti; /* time stamp for measurement interval */
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double start_ti[4]; /* time stamp for start of counting */
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double last_ti[4]; /* time stamp of last received time */
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double spl_count[4]; /* sample counter for sound card */
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/* making average of measurement values */
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double speed_ppm[4][256]; /* history of clock speed measurements */
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int idx[4]; /* index of current value */
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int num[4]; /* total num of values so far */
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};
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/* instance of cnetz sender */
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struct cnetz {
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sender_t sender;
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enum cnetz_chan_type chan_type; /* channel type */
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scrambler_t scrambler_tx; /* mirror what we transmit to MS */
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scrambler_t scrambler_rx; /* mirror what we receive from MS */
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compandor_t cstate;
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int pre_emphasis; /* use pre_emphasis by this instance */
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int de_emphasis; /* use de_emphasis by this instance */
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emphasis_t estate;
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/* call config */
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int ms_power; /* power level of MS, use 0..3 */
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int challenge_valid; /* send authorizaton value */
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uint64_t challenge; /* authorization value */
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int response_valid; /* expect authorizaton response */
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uint64_t response; /* authorization response */
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int warteschlange; /* use queue */
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int metering; /* use metering pulses in seconds 0 = off */
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/* all cnetz states */
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enum cnetz_state state; /* main state of sender */
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/* polarity detection */
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int auto_polarity; /* if set, polarity of transmitter is selected */
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int negative_polarity; /* current polarity 0: positive 1: negative */
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/* scheduler */
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int sched_ts; /* current time slot */
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int sched_last_ts; /* last timeslot we transmitted, to sync time of the receiver */
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int sched_r_m; /* Rufblock (0) / Meldeblock (1) */
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enum dsp_mode sched_dsp_mode; /* what mode shall be switched to */
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int sched_dsp_mode_ts; /* time slot when to switch mode (-1 = don't switch) */
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/* dsp states */
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enum dsp_mode dsp_mode; /* current mode: audio, "Telegramm", .... */
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iir_filter_t lp; /* low pass filter to eliminate noise above 5280 Hz */
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fsk_fm_demod_t fsk_demod; /* demod process */
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double fsk_deviation; /* deviation of FSK signal on sound card */
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sample_t fsk_ramp_up[256]; /* samples of upward ramp shape */
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sample_t fsk_ramp_down[256]; /* samples of downward ramp shape */
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double fsk_bitduration; /* duration of a bit in samples */
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sample_t *fsk_tx_buffer; /* tx buffer for one data block */
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int fsk_tx_buffer_size; /* size of tx buffer (in samples) */
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int fsk_tx_buffer_length; /* usage of buffer (in samples) */
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int fsk_tx_buffer_pos; /* current position sending buffer */
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double fsk_tx_bitstep; /* fraction of a bit each sample */
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double fsk_tx_phase; /* current bit position */
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uint64_t fsk_tx_scount; /* sample counter (used to sync multiple channels) */
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int scrambler; /* 0 = normal speech, 1 = scrambled speech */
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int scrambler_switch; /* counter to switch after 3 frames with new scrabler state */
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sample_t *dsp_speech_buffer; /* samples in one chunk */
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int dsp_speech_length; /* number of samples */
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int dsp_speech_pos; /* current position in buffer */
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/* sync multiple channels on one sound card */
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uint64_t frame_last_scount; /* master's sample count of last frame sync */
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double frame_last_phase; /* master's bit phase of last frame sync */
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/* audio offset removal */
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double offset_factor; /* filer alpha of high-pass filter */
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double offset_y_last; /* last stored sample */
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/* measurements */
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int measure_speed; /* measure clock speed */
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struct clock_speed clock_speed;
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transaction_t *trans_list; /* list of transactions */
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};
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double cnetz_kanal2freq(int kanal, int unterband);
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void cnetz_channel_list(void);
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int cnetz_channel_by_short_name(const char *short_name);
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const char *chan_type_short_name(enum cnetz_chan_type chan_type);
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const char *chan_type_long_name(enum cnetz_chan_type chan_type);
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int cnetz_init(void);
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int cnetz_create(const char *kanal, enum cnetz_chan_type chan_type, const char *audiodev, int use_sdr, enum demod_type demod, int samplerate, double rx_gain, double tx_gain, int challenge_valid, uint64_t challenge, int response_valid, uint64_t response, int warteschlange, int metering, double speech_deviation, int ms_power, int measure_speed, double clock_speed[2], int polarity, 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);
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void cnetz_destroy(sender_t *sender);
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void cnetz_go_idle(cnetz_t *cnetz);
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void cnetz_sync_frame(cnetz_t *cnetz, double sync, int ts);
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int cnetz_meldeaufruf(uint8_t futln_nat, uint8_t futln_fuvst, uint16_t futln_rest);
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const struct telegramm *cnetz_transmit_telegramm_rufblock(cnetz_t *cnetz);
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const struct telegramm *cnetz_transmit_telegramm_meldeblock(cnetz_t *cnetz);
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void cnetz_receive_telegramm_ogk(cnetz_t *cnetz, struct telegramm *telegramm, int block);
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const struct telegramm *cnetz_transmit_telegramm_spk_k(cnetz_t *cnetz);
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void cnetz_receive_telegramm_spk_k(cnetz_t *cnetz, struct telegramm *telegramm);
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const struct telegramm *cnetz_transmit_telegramm_spk_v(cnetz_t *cnetz);
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void cnetz_receive_telegramm_spk_v(cnetz_t *cnetz, struct telegramm *telegramm);
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void cnetz_display_status(void);
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