aboutsummaryrefslogtreecommitdiffstats
path: root/src/cnetz/cnetz.h
blob: ed73831fec08ab56208456420567fce65fe16d3a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
#include "../common/compandor.h"
#include "../common/sender.h"
#include "fsk_demod.h"
#include "scrambler.h"
#include "transaction.h"

#define CNETZ_OGK_KANAL		131

/* dsp modes of transmission */
enum dsp_mode {
	DSP_SCHED_NONE = 0,	/* use for sheduling: nothing to shedule */
	DSP_MODE_OFF,		/* send nothing on unused SpK */
	DSP_MODE_OGK,		/* send "Telegramm" on OgK */
	DSP_MODE_SPK_K,		/* send concentrated "Telegramm" SpK */
	DSP_MODE_SPK_V,		/* send distributed "Telegramm" SpK */
};

enum cnetz_chan_type {
	CHAN_TYPE_OGK,		/* pure standard organization channel (channel 131) */
	CHAN_TYPE_SPK,		/* pure traffic channel */
	CHAN_TYPE_OGK_SPK,	/* combined OGK + SPK; note: some phones may reject SPK on channel 131 */
};

/* current state of c-netz sender */
enum cnetz_state {
	CNETZ_NULL,		/* before power on */
	CNETZ_IDLE,		/* broadcasting LR/MLR on Ogk */
	CNETZ_BUSY,		/* currently processing a call, no other transaction allowed */
};

/* timers */
#define F_BQ		8		/* number of not received frames at BQ state */
#define F_VHQK		16		/* number of not received frames at VHQ state during concentrated signaling */
#define F_VHQ		16		/* number of not received frames at VHQ state during distributed signaling */
#define F_DS		16		/* number of not received frames at DS state */
#define F_RTA		16		/* number of not received frames at RTA state */
#define N_AFKT		6		/* number of release frames to send during concentrated signaling */
#define N_AFV		4		/* number of release frames to send during distributed signaling */
#define N		3		/* now many times we repeat a message on OgK */

/* clear causes */
#define CNETZ_CAUSE_GASSENBESETZT	0	/* network congested */
#define CNETZ_CAUSE_TEILNEHMERBESETZT	1	/* subscriber busy */
#define CNETZ_CAUSE_FUNKTECHNISCH	2	/* radio transmission fault */

struct cnetz;
struct telegramm;

struct clock_speed {
	double			meas_ti;		/* time stamp for measurement interval */
	double			start_ti[4];		/* time stamp for start of counting */
	double			last_ti[4];		/* time stamp of last received time */
	double			spl_count[4];		/* sample counter for sound card */
	/* making average of measurement values */
	double			speed_ppm[4][256];	/* history of clock speed measurements */
	int			idx[4];			/* index of current value */
	int			num[4];			/* total num of values so far */
};

/* instance of cnetz sender */
typedef struct cnetz {
	sender_t		sender;
	enum cnetz_chan_type	chan_type;		/* channel type */
	scrambler_t		scrambler_tx;		/* mirror what we transmit to MS */
	scrambler_t		scrambler_rx;		/* mirror what we receive from MS */
	compandor_t		cstate;
	int			pre_emphasis;		/* use pre_emphasis by this instance */
	int			de_emphasis;		/* use de_emphasis by this instance */
	emphasis_t		estate;

	/* cell config */
	int			ms_power;		/* power level of MS, use 0..3 */
	int			auth;			/* authentication support of the cell */

	/* all cnetz states */
	enum cnetz_state	state;			/* main state of sender */

	/* cell nr selection */
	int			cell_auto;		/* if set, cell_nr is selected automatically */
	int			cell_nr;		/* current cell number to use (sysinfo) */

	/* scheduler */
	int			sched_ts;		/* current time slot */
	int			sched_last_ts[2];	/* last timeslot we transmitted, so we can match MS timeslot */
	int			sched_r_m;		/* Rufblock (0) / Meldeblock (1) */
	int			sched_switch_mode;	/* counts slots until mode is switched */
	enum dsp_mode		sched_dsp_mode;		/* what mode shall be switched to  */

	/* dsp states */
	enum dsp_mode		dsp_mode;		/* current mode: audio, "Telegramm", .... */
	iir_filter_t		lp;			/* low pass filter to eliminate noise above 5280 Hz */
	fsk_fm_demod_t		fsk_demod;		/* demod process */
	double			fsk_deviation;		/* deviation of FSK signal on sound card */
	sample_t		fsk_ramp_up[256];	/* samples of upward ramp shape */
	sample_t		fsk_ramp_down[256];	/* samples of downward ramp shape */
	double			fsk_bitduration;	/* duration of a bit in samples */
	sample_t		*fsk_tx_buffer;		/* tx buffer for one data block */
	int			fsk_tx_buffer_size;	/* size of tx buffer (in samples) */
	int			fsk_tx_buffer_length;	/* usage of buffer (in samples) */
	int			fsk_tx_buffer_pos;	/* current position sending buffer */
	double			fsk_tx_bitstep;		/* fraction of a bit each sample */
	double			fsk_tx_phase;		/* current bit position */
	uint64_t		fsk_tx_scount;		/* sample counter (used to sync multiple channels) */
	int			scrambler;		/* 0 = normal speech, 1 = scrambled speech */
	sample_t		*dsp_speech_buffer;	/* samples in one chunk */
	int			dsp_speech_length;	/* number of samples */
	int			dsp_speech_pos;		/* current position in buffer */

	/* sync multiple channels on one sound card */
	uint64_t		frame_last_scount;	/* master's sample count of last frame sync */
	double			frame_last_phase;	/* master's bit phase of last frame sync */

	/* audio offset removal */
	double			offset_factor;		/* filer alpha of high-pass filter */
	double			offset_y_last;		/* last stored sample */

	/* measurements */
	int			measure_speed;		/* measure clock speed */
	struct clock_speed	clock_speed;

	transaction_t		*trans_list;		/* list of transactions */
} cnetz_t;

double cnetz_kanal2freq(int kanal, int unterband);
void cnetz_channel_list(void);
int cnetz_channel_by_short_name(const char *short_name);
const char *chan_type_short_name(enum cnetz_chan_type chan_type);
const char *chan_type_long_name(enum cnetz_chan_type chan_type);
int cnetz_init(void);
int cnetz_create(int kanal, enum cnetz_chan_type chan_type, const char *audiodev, int use_sdr, enum demod_type demod, int samplerate, double rx_gain, int auth, 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, int loopback);
void cnetz_destroy(sender_t *sender);
void cnetz_go_idle(cnetz_t *cnetz);
void cnetz_sync_frame(cnetz_t *cnetz, double sync, int ts);
int cnetz_meldeaufruf(uint8_t futln_nat, uint8_t futln_fuvst, uint16_t futln_rest);
const struct telegramm *cnetz_transmit_telegramm_rufblock(cnetz_t *cnetz);
const struct telegramm *cnetz_transmit_telegramm_meldeblock(cnetz_t *cnetz);
void cnetz_receive_telegramm_ogk(cnetz_t *cnetz, struct telegramm *telegramm, int block);
const struct telegramm *cnetz_transmit_telegramm_spk_k(cnetz_t *cnetz);
void cnetz_receive_telegramm_spk_k(cnetz_t *cnetz, struct telegramm *telegramm);
const struct telegramm *cnetz_transmit_telegramm_spk_v(cnetz_t *cnetz);
void cnetz_receive_telegramm_spk_v(cnetz_t *cnetz, struct telegramm *telegramm);
void cnetz_display_status(void);