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
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
/** toxrtp.h
*
* Copyright (C) 2013 Tox project All Rights Reserved.
*
* This file is part of Tox.
*
* Tox is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Tox 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Tox. If not, see <http://www.gnu.org/licenses/>.
*
*
* Report bugs/suggestions at #tox-dev @ freenode.net:6667
*/
#ifndef __TOXRTP
#define __TOXRTP
#define RTP_VERSION 2
#include <inttypes.h>
#include <pthread.h>
#include "../toxcore/util.h"
#include "../toxcore/network.h"
#include "../toxcore/net_crypto.h"
#include "../toxcore/Messenger.h"
#define MAX_SEQU_NUM 65535
#define MAX_RTP_SIZE 65535
/**
* @brief Standard rtp header
*
*/
typedef struct _RTPHeader {
uint8_t flags; /* Version(2),Padding(1), Ext(1), Cc(4) */
uint8_t marker_payloadt; /* Marker(1), PlayLoad Type(7) */
uint16_t sequnum; /* Sequence Number */
uint32_t timestamp; /* Timestamp */
uint32_t ssrc; /* SSRC */
uint32_t csrc[16]; /* CSRC's table */
uint32_t length; /* Length of the header in payload string. */
} RTPHeader;
/**
* @brief Standard rtp extension header.
*
*/
typedef struct _RTPExtHeader {
uint16_t type; /* Extension profile */
uint16_t length; /* Number of extensions */
uint32_t *table; /* Extension's table */
} RTPExtHeader;
/**
* @brief Standard rtp message.
*
*/
typedef struct _RTPMessage {
RTPHeader *header;
RTPExtHeader *ext_header;
uint8_t data[MAX_RTP_SIZE];
uint32_t length;
struct _RTPMessage *next;
} RTPMessage;
/**
* @brief Our main session descriptor.
* It measures the session variables and controls
* the entire session. There are functions for manipulating
* the session so tend to use those instead of directly modifying
* session parameters.
*
*/
typedef struct _RTPSession {
uint8_t version;
uint8_t padding;
uint8_t extension;
uint8_t cc;
uint8_t marker;
uint8_t payload_type;
uint16_t sequnum; /* Set when sending */
uint16_t rsequnum; /* Check when recving msg */
uint32_t timestamp;
uint32_t ssrc;
uint32_t *csrc;
/* If some additional data must be sent via message
* apply it here. Only by allocating this member you will be
* automatically placing it within a message.
*/
RTPExtHeader *ext_header;
/* External header identifiers */
int resolution;
int framerate;
/* Since these are only references of the
* call structure don't allocate or free
*/
const uint8_t *encrypt_key;
const uint8_t *decrypt_key;
uint8_t *encrypt_nonce;
uint8_t *decrypt_nonce;
uint8_t *nonce_cycle;
RTPMessage *oldest_msg;
RTPMessage *last_msg; /* tail */
/* Msg prefix for core to know when recving */
uint8_t prefix;
pthread_mutex_t mutex;
int dest;
} RTPSession;
/**
* @brief Release all messages held by session.
*
* @param session The session.
* @return int
* @retval -1 Error occurred.
* @retval 0 Success.
*/
int rtp_release_session_recv ( RTPSession *session );
/**
* @brief Get's oldest message in the list.
*
* @param session Where the list is.
* @return RTPMessage* The message. You need to call rtp_msg_free() to free it.
* @retval NULL No messages in the list, or no list.
*/
RTPMessage *rtp_recv_msg ( RTPSession *session );
/**
* @brief Sends msg to _RTPSession::dest
*
* @param session The session.
* @param msg The message
* @param messenger Tox* object.
* @return int
* @retval -1 On error.
* @retval 0 On success.
*/
int rtp_send_msg ( RTPSession *session, Messenger *messenger, const uint8_t *data, uint16_t length );
/**
* @brief Speaks for it self.
*
* @param session The control session msg belongs to. It can be NULL.
* @param msg The message.
* @return void
*/
void rtp_free_msg ( RTPSession *session, RTPMessage *msg );
/**
* @brief Must be called before calling any other rtp function. It's used
* to initialize RTP control session.
*
* @param payload_type Type of payload used to send. You can use values in toxmsi.h::MSICallType
* @param messenger Tox* object.
* @param friend_num Friend id.
* @param encrypt_key Speaks for it self.
* @param decrypt_key Speaks for it self.
* @param encrypt_nonce Speaks for it self.
* @param decrypt_nonce Speaks for it self.
* @return RTPSession* Created control session.
* @retval NULL Error occurred.
*/
RTPSession *rtp_init_session ( int payload_type,
Messenger *messenger,
int friend_num,
const uint8_t *encrypt_key,
const uint8_t *decrypt_key,
const uint8_t *encrypt_nonce,
const uint8_t *decrypt_nonce );
/**
* @brief Terminate the session.
*
* @param session The session.
* @param messenger The messenger who owns the session
* @return int
* @retval -1 Error occurred.
* @retval 0 Success.
*/
int rtp_terminate_session ( RTPSession *session, Messenger *messenger );
#endif /* __TOXRTP */
|
