aboutsummaryrefslogtreecommitdiffstats
path: root/openbsc/include/openbsc/mgcp_internal.h
blob: 20c433a2e005f686d6baeeb4b3cbf6749bc715e0 (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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
/* MGCP Private Data */

/*
 * (C) 2009-2012 by Holger Hans Peter Freyther <zecke@selfish.org>
 * (C) 2009-2012 by On-Waves
 * All Rights Reserved
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef OPENBSC_MGCP_DATA_H
#define OPENBSC_MGCP_DATA_H

#include <osmocom/core/select.h>

#define CI_UNUSED 0

enum mgcp_connection_mode {
	MGCP_CONN_NONE = 0,
	MGCP_CONN_RECV_ONLY = 1,
	MGCP_CONN_SEND_ONLY = 2,
	MGCP_CONN_RECV_SEND = MGCP_CONN_RECV_ONLY | MGCP_CONN_SEND_ONLY,
	MGCP_CONN_LOOPBACK  = 4,
};

enum mgcp_trunk_type {
	MGCP_TRUNK_VIRTUAL,
	MGCP_TRUNK_E1,
};

struct mgcp_rtp_stream_state {
	uint32_t ssrc;
	uint16_t last_seq;
	uint32_t last_timestamp;
	uint32_t err_ts_counter;
	int32_t last_tsdelta;
};

struct mgcp_rtp_state {
	int initialized;
	int patch_ssrc;

	uint32_t orig_ssrc;

	uint16_t base_seq;
	int seq_offset;
	int cycles;

	int32_t  timestamp_offset;
	uint32_t packet_duration;
	uint32_t jitter;
	int32_t transit;

	struct mgcp_rtp_stream_state in_stream;
	struct mgcp_rtp_stream_state out_stream;
};

struct mgcp_rtp_end {
	/* statistics */
	unsigned int packets;
	unsigned int octets;
	struct in_addr addr;

	/* in network byte order */
	int rtp_port, rtcp_port;

	/* per endpoint data */
	int payload_type;
	uint32_t rate;
	uint32_t frame_duration_num;
	uint32_t frame_duration_den;
	int  frames_per_packet;
	uint32_t packet_duration_ms;
	char *fmtp_extra;

	/* RTP patching */
	int force_constant_ssrc; /* -1: always, 0: don't, 1: once */
	int force_constant_timing;

	/*
	 * Each end has a socket...
	 */
	struct osmo_fd rtp;
	struct osmo_fd rtcp;

	int local_port;
	int local_alloc;
};

enum {
	MGCP_TAP_BTS_IN,
	MGCP_TAP_BTS_OUT,
	MGCP_TAP_NET_IN,
	MGCP_TAP_NET_OUT,

	/* last element */
	MGCP_TAP_COUNT
};

struct mgcp_rtp_tap {
	int enabled;
	struct sockaddr_in forward;
};

struct mgcp_lco {
	char *string;
	int pkt_period_min; /* time in ms */
	int pkt_period_max; /* time in ms */
};

enum mgcp_type {
	MGCP_RTP_DEFAULT	= 0,
	MGCP_RTP_TRANSCODED,
};

struct mgcp_endpoint {
	int allocated;
	uint32_t ci;
	char *callid;
	struct mgcp_lco local_options;
	int conn_mode;
	int orig_mode;

	/* backpointer */
	struct mgcp_config *cfg;
	struct mgcp_trunk_config *tcfg;

	/* port status for bts/net */
	struct mgcp_rtp_end bts_end;
	struct mgcp_rtp_end net_end;

	/*
	 * For transcoding we will send from the local_port
	 * of trans_bts and it will arrive at trans_net from
	 * where we will forward it to the network.
	 */
	struct mgcp_rtp_end trans_bts;
	struct mgcp_rtp_end trans_net;
	enum mgcp_type type;

	/* sequence bits */
	struct mgcp_rtp_state net_state;
	struct mgcp_rtp_state bts_state;

	/* fields for re-transmission */
	char *last_trans;
	char *last_response;

	/* tap for the endpoint */
	struct mgcp_rtp_tap taps[MGCP_TAP_COUNT];
};

#define ENDPOINT_NUMBER(endp) abs(endp - endp->tcfg->endpoints)

struct mgcp_msg_ptr {
	unsigned int start;
	unsigned int length;
};

int mgcp_send_dummy(struct mgcp_endpoint *endp);
int mgcp_bind_bts_rtp_port(struct mgcp_endpoint *endp, int rtp_port);
int mgcp_bind_net_rtp_port(struct mgcp_endpoint *endp, int rtp_port);
int mgcp_bind_trans_bts_rtp_port(struct mgcp_endpoint *enp, int rtp_port);
int mgcp_bind_trans_net_rtp_port(struct mgcp_endpoint *enp, int rtp_port);
int mgcp_free_rtp_port(struct mgcp_rtp_end *end);

/* For transcoding we need to manage an in and an output that are connected */
static inline int endp_back_channel(int endpoint)
{
	return endpoint + 60;
}

struct mgcp_trunk_config *mgcp_trunk_alloc(struct mgcp_config *cfg, int index);
struct mgcp_trunk_config *mgcp_trunk_num(struct mgcp_config *cfg, int index);

void mgcp_rtp_end_config(struct mgcp_endpoint *endp, int expect_ssrc_change,
			 struct mgcp_rtp_end *rtp);
uint32_t mgcp_rtp_packet_duration(struct mgcp_endpoint *endp,
				  struct mgcp_rtp_end *rtp);

void mgcp_state_calc_loss(struct mgcp_rtp_state *s, struct mgcp_rtp_end *,
			uint32_t *expected, int *loss);
uint32_t mgcp_state_calc_jitter(struct mgcp_rtp_state *);


#endif