Implementation of C-Netz (German mobile telephone system)
This commit is contained in:
Andreas Eversberg
151
src/cnetz/cnetz.h
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151
src/cnetz/cnetz.h
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#include "../common/compander.h"
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#include "../common/sender.h"
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#include "fsk_fm_demod.h"
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#include "scrambler.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 sheduling: nothing to shedule */
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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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/* current state of c-netz sender */
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enum cnetz_state {
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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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/* login to the network */
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#define TRANS_EM (1 << 0) /* attach request received, sending reply */
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/* roaming to different base station/network */
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#define TRANS_UM (1 << 1) /* roaming request received, sending reply */
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/* check if phone is still on */
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#define TRANS_MA (1 << 2) /* periodic online check sent, waiting for reply */
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/* mobile originated call */
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#define TRANS_VWG (1 << 3) /* received dialing request, waiting for time slot to send dial order */
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#define TRANS_WAF (1 << 4) /* dial order sent, waiting for dialing */
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#define TRANS_WBP (1 << 5) /* dialing received, waiting for time slot to acknowledge call */
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#define TRANS_WBN (1 << 6) /* dialing received, waiting for time slot to reject call */
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#define TRANS_VAG (1 << 7) /* establishment of call sent, switching channel */
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/* mobile terminated call */
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#define TRANS_VAK (1 << 8) /* establishment of call sent, switching channel */
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/* traffic channel */
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#define TRANS_BQ (1 << 9) /* accnowledge channel */
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#define TRANS_VHQ (1 << 10) /* hold call */
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#define TRANS_RTA (1 << 11) /* hold call and make the phone ring */
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#define TRANS_DS (1 << 12) /* establish speech connection */
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#define TRANS_AHQ (1 << 13) /* establish speech connection after answer */
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/* release */
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#define TRANS_AF (1 << 14) /* release connection by base station */
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#define TRANS_AT (1 << 15) /* release connection by mobile station */
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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 signalling */
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#define F_VHQ 16 /* number of not received frames at VHQ state during distributed signalling */
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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 signalling */
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#define N_AFV 4 /* number of release frames to send during distributed signalling */
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/* clear causes */
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#define CNETZ_CAUSE_TEILNEHMERBESETZT 0 /* subscriber busy */
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#define CNETZ_CAUSE_GASSENBESETZT 1 /* network congested */
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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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typedef struct transaction {
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struct transaction *next; /* pointer to next node in list */
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struct cnetz *cnetz; /* pointer to cnetz instance */
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uint8_t futln_nat; /* current station ID (3 values) */
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uint8_t futln_fuvst;
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uint16_t futln_rest;
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char dialing[17]; /* number dialed by the phone */
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int32_t state; /* state of transaction */
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int8_t release_cause; /* reason for release, (c-netz coding) */
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int count; /* counts resending things */
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struct timer timer; /* for varous timeouts */
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int mo_call; /* flags a moile originating call */
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int mt_call; /* flags a moile terminating call */
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} transaction_t;
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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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uint64_t spl_count[4]; /* sample counter for sound card */
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};
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/* instance of cnetz sender */
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typedef struct cnetz {
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sender_t sender;
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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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compander_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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/* cell config */
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int ms_power; /* power level of MS, use 0..3 */
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int auth; /* authentication support of the cell */
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/* all cnetz states */
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enum cnetz_state state; /* main state of sender */
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/* scheduler */
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int sched_ts; /* current time slot */
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int last_tx_timeslot; /* last timeslot we transmitted, so we can match MS timeslot */
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int sched_r_m; /* Rufblock (0) / Meldeblock (1) */
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int sched_switch_mode; /* counts slots until mode is switched */
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enum dsp_mode sched_dsp_mode; /* what mode shall be switched to */
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/* dsp states */
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enum dsp_mode dsp_mode; /* current mode: audio, "Telegramm", .... */
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fsk_fm_demod_t fsk_demod; /* demod process */
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int16_t fsk_deviation; /* deviation used for digital signal */
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int16_t fsk_ramp_up[256]; /* samples of upward ramp shape */
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int16_t fsk_ramp_down[256]; /* samples of downward ramp shape */
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double fsk_noise; /* send static between OgK frames */
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double fsk_bitduration; /* duration of a bit in samples */
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int16_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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int scrambler; /* 0 = normal speech, 1 = scrambled speech */
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int16_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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/* audio offset removal */
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double offset_removal_factor; /* how much to remove every sample */
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int16_t offset_last_sample; /* last sample of last audio chunk */
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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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} cnetz_t;
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double cnetz_kanal2freq(int kanal, int unterband);
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int cnetz_init(void);
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int cnetz_create(const char *sounddev, int samplerate, int pre_emphasis, int de_emphasis, const char *write_wave, const char *read_wave, int kanal, int auth, int ms_power, int measure_speed, double clock_speed[2], double deviation, double noise, int loopback);
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void cnetz_destroy(sender_t *sender);
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void cnetz_sync_frame(cnetz_t *cnetz, double sync, int ts);
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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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