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
|
/* Osmo-CC: helpers to simplify Osmo-CC usage
*
* (C) 2016 by Andreas Eversberg <jolly@eversberg.eu>
* All Rights Reserved
*
* This program 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.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/time.h>
#include <inttypes.h>
#include "../libtimer/timer.h"
#include "../libdebug/debug.h"
#include "endpoint.h"
#include "helper.h"
osmo_cc_session_t *osmo_cc_helper_audio_offer(void *priv, struct osmo_cc_helper_audio_codecs *codecs, void (*receiver)(struct osmo_cc_session_codec *codec, uint16_t sequence_number, uint32_t timestamp, uint8_t *data, int len), osmo_cc_msg_t *msg, int debug)
{
osmo_cc_session_t *session;
osmo_cc_session_media_t *media;
const char *sdp;
int i;
session = osmo_cc_new_session(priv, NULL, NULL, NULL, 0, 0, NULL, NULL, debug);
if (!session)
return NULL;
media = osmo_cc_add_media(session, 0, 0, NULL, osmo_cc_session_media_type_audio, 0, osmo_cc_session_media_proto_rtp, 1, 1, receiver, debug);
osmo_cc_rtp_open(media);
for (i = 0; codecs[i].payload_name; i++)
osmo_cc_add_codec(media, codecs[i].payload_name, codecs[i].payload_rate, codecs[i].payload_channels, codecs[i].encoder, codecs[i].decoder, debug);
sdp = osmo_cc_session_send_offer(session);
osmo_cc_add_ie_sdp(msg, sdp);
return session;
}
const char *osmo_cc_helper_audio_accept(void *priv, struct osmo_cc_helper_audio_codecs *codecs, void (*receiver)(struct osmo_cc_session_codec *codec, uint16_t sequence_number, uint32_t timestamp, uint8_t *data, int len), osmo_cc_msg_t *msg, osmo_cc_session_t **session_p, osmo_cc_session_codec_t **codec_p, int force_our_codec)
{
char offer_sdp[65536];
const char *accept_sdp;
osmo_cc_session_media_t *media, *selected_media;
osmo_cc_session_codec_t *codec, *selected_codec, *telephone_event;
int rc;
int i, selected_codec_i, telephone_event_i;
if (*session_p) {
PDEBUG(DCC, DEBUG_ERROR, "Session already set, please fix!\n");
abort();
}
if (*codec_p) {
PDEBUG(DCC, DEBUG_ERROR, "Codec already set, please fix!\n");
abort();
}
/* SDP IE */
rc = osmo_cc_get_ie_sdp(msg, 0, offer_sdp, sizeof(offer_sdp));
if (rc < 0) {
PDEBUG(DCC, DEBUG_ERROR, "There is no SDP included in setup request.\n");
return NULL;
}
*session_p = osmo_cc_session_receive_offer(priv, offer_sdp);
if (!*session_p) {
PDEBUG(DCC, DEBUG_ERROR, "Failed to parse SDP.\n");
return NULL;
}
selected_media = NULL;
osmo_cc_session_for_each_media((*session_p)->media_list, media) {
/* only audio */
if (media->description.type != osmo_cc_session_media_type_audio)
continue;
selected_codec_i = -1;
selected_codec = NULL;
telephone_event_i = -1;
telephone_event = NULL;
osmo_cc_session_for_each_codec(media->codec_list, codec) {
if (!!strcasecmp(codec->payload_name, "telephone-event")) {
for (i = 0; codecs[i].payload_name; i++) {
if (osmo_cc_session_if_codec(codec, codecs[i].payload_name, codecs[i].payload_rate, codecs[i].payload_channels)) {
/* select the first matchting codec or the one we prefer */
if (selected_codec_i < 0 || i < selected_codec_i) {
selected_codec = codec;
selected_codec_i = i;
selected_media = media;
}
/* if we don't force our preferred codec, use the preferred one from the remote */
if (!force_our_codec)
break;
}
}
} else {
/* special case: add telephone-event, if supported */
for (i = 0; codecs[i].payload_name; i++) {
if (!!strcasecmp(codecs[i].payload_name, "telephone-event"))
continue;
telephone_event = codec;
telephone_event_i = i;
break;
}
}
}
/* codec is selected within this media, we are done */
if (selected_codec)
break;
}
if (!selected_codec) {
PDEBUG(DCC, DEBUG_ERROR, "No codec found in setup message that we support.\n");
osmo_cc_free_session(*session_p);
return NULL;
}
osmo_cc_session_accept_codec(selected_codec, codecs[selected_codec_i].encoder, codecs[selected_codec_i].decoder);
if (telephone_event)
osmo_cc_session_accept_codec(telephone_event, codecs[telephone_event_i].encoder, codecs[telephone_event_i].decoder);
osmo_cc_session_accept_media(selected_media, 0, 0, NULL, 1, 1, receiver);
osmo_cc_rtp_open(selected_media);
osmo_cc_rtp_connect(selected_media);
*codec_p = selected_codec;
accept_sdp = osmo_cc_session_send_answer(*session_p);
if (!accept_sdp) {
osmo_cc_free_session(*session_p);
return NULL;
}
return accept_sdp;
}
int osmo_cc_helper_audio_negotiate(osmo_cc_msg_t *msg, osmo_cc_session_t **session_p, osmo_cc_session_codec_t **codec_p)
{
char sdp[65536];
osmo_cc_session_media_t *media;
int rc;
if (!(*session_p)) {
PDEBUG(DCC, DEBUG_ERROR, "Session not set, please fix!\n");
abort();
}
/* once done, just ignore further messages that reply to setup */
if (*codec_p)
return 0;
/* SDP IE */
rc = osmo_cc_get_ie_sdp(msg, 0, sdp, sizeof(sdp));
if (rc < 0)
return 0; // no reply in this message
rc = osmo_cc_session_receive_answer(*session_p, sdp);
if (rc < 0)
return rc;
osmo_cc_session_for_each_media((*session_p)->media_list, media) {
/* only audio */
if (media->description.type != osmo_cc_session_media_type_audio)
continue;
/* select first codec, if one was accpeted */
if (media->codec_list)
*codec_p = media->codec_list;
if (*codec_p) {
osmo_cc_rtp_connect(media);
/* no more media streams */
break;
}
}
if (!(*codec_p)) {
PDEBUG(DCC, DEBUG_ERROR, "No codec found in setup reply message that we support.\n");
return -EIO;
}
return 0;
}
|
