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[libav.git] / libavformat / sdp.c
1 /*
2 * copyright (c) 2007 Luca Abeni
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include "libavutil/avstring.h"
22 #include "libavutil/base64.h"
23 #include "avformat.h"
24 #include "avc.h"
25 #include "rtp.h"
26
27 #ifdef CONFIG_RTP_MUXER
28 #define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2)
29
30 struct sdp_session_level {
31 int sdp_version; /**< protocol version (currently 0) */
32 int id; /**< session id */
33 int version; /**< session version */
34 int start_time; /**< session start time (NTP time, in seconds),
35 or 0 in case of permanent session */
36 int end_time; /**< session end time (NTP time, in seconds),
37 or 0 if the session is not bounded */
38 int ttl; /**< TTL, in case of multicast stream */
39 const char *user; /**< username of the session's creator */
40 const char *src_addr; /**< IP address of the machine from which the session was created */
41 const char *dst_addr; /**< destination IP address (can be multicast) */
42 const char *name; /**< session name (can be an empty string) */
43 };
44
45 static void dest_write(char *buff, int size, const char *dest_addr, int ttl)
46 {
47 if (dest_addr) {
48 if (ttl > 0) {
49 av_strlcatf(buff, size, "c=IN IP4 %s/%d\r\n", dest_addr, ttl);
50 } else {
51 av_strlcatf(buff, size, "c=IN IP4 %s\r\n", dest_addr);
52 }
53 }
54 }
55
56 static void sdp_write_header(char *buff, int size, struct sdp_session_level *s)
57 {
58 av_strlcatf(buff, size, "v=%d\r\n"
59 "o=- %d %d IN IPV4 %s\r\n"
60 "t=%d %d\r\n"
61 "s=%s\r\n"
62 "a=tool:libavformat\r\n",
63 s->sdp_version,
64 s->id, s->version, s->src_addr,
65 s->start_time, s->end_time,
66 s->name[0] ? s->name : "No Name");
67 dest_write(buff, size, s->dst_addr, s->ttl);
68 }
69
70 static int get_address(char *dest_addr, int size, int *ttl, const char *url)
71 {
72 int port;
73 const char *p;
74
75 url_split(NULL, 0, NULL, 0, dest_addr, size, &port, NULL, 0, url);
76
77 *ttl = 0;
78 p = strchr(url, '?');
79 if (p) {
80 char buff[64];
81 int is_multicast = find_info_tag(buff, sizeof(buff), "multicast", p);
82
83 if (is_multicast) {
84 if (find_info_tag(buff, sizeof(buff), "ttl", p)) {
85 *ttl = strtol(buff, NULL, 10);
86 } else {
87 *ttl = 5;
88 }
89 }
90 }
91
92 return port;
93 }
94
95 #define MAX_PSET_SIZE 1024
96 static char *extradata2psets(AVCodecContext *c)
97 {
98 char *psets, *p;
99 const uint8_t *r;
100 const char *pset_string = "; sprop-parameter-sets=";
101
102 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
103 av_log(c, AV_LOG_ERROR, "Too many extra data!\n");
104
105 return NULL;
106 }
107
108 psets = av_mallocz(MAX_PSET_SIZE);
109 if (psets == NULL) {
110 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets\n");
111 return NULL;
112 }
113 memcpy(psets, pset_string, strlen(pset_string));
114 p = psets + strlen(pset_string);
115 r = ff_avc_find_startcode(c->extradata, c->extradata + c->extradata_size);
116 while (r < c->extradata + c->extradata_size) {
117 const uint8_t *r1;
118
119 while (!*(r++));
120 r1 = ff_avc_find_startcode(r, c->extradata + c->extradata_size);
121 if (p != (psets + strlen(pset_string))) {
122 *p = ',';
123 p++;
124 }
125 if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) {
126 av_log(c, AV_LOG_ERROR, "Cannot BASE64 encode %td %td!\n", MAX_PSET_SIZE - (p - psets), r1 - r);
127 av_free(psets);
128
129 return NULL;
130 }
131 p += strlen(p);
132 r = r1;
133 }
134
135 return psets;
136 }
137
138 static void digit_to_char(char *dst, uint8_t src)
139 {
140 if (src < 10) {
141 *dst = '0' + src;
142 } else {
143 *dst = 'A' + src - 10;
144 }
145 }
146
147 static char *data_to_hex(char *buff, const uint8_t *src, int s)
148 {
149 int i;
150
151 for(i = 0; i < s; i++) {
152 digit_to_char(buff + 2 * i, src[i] >> 4);
153 digit_to_char(buff + 2 * i + 1, src[i] & 0xF);
154 }
155
156 return buff;
157 }
158
159 static char *extradata2config(AVCodecContext *c)
160 {
161 char *config;
162
163 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
164 av_log(c, AV_LOG_ERROR, "Too many extra data!\n");
165
166 return NULL;
167 }
168 config = av_malloc(10 + c->extradata_size * 2);
169 if (config == NULL) {
170 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info\n");
171 return NULL;
172 }
173 memcpy(config, "; config=", 9);
174 data_to_hex(config + 9, c->extradata, c->extradata_size);
175 config[9 + c->extradata_size * 2] = 0;
176
177 return config;
178 }
179
180 static char *sdp_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type)
181 {
182 char *config = NULL;
183
184 switch (c->codec_id) {
185 case CODEC_ID_H264:
186 if (c->extradata_size) {
187 config = extradata2psets(c);
188 }
189 av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n"
190 "a=fmtp:%d packetization-mode=1%s\r\n",
191 payload_type,
192 payload_type, config ? config : "");
193 break;
194 case CODEC_ID_MPEG4:
195 if (c->extradata_size) {
196 config = extradata2config(c);
197 }
198 av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"
199 "a=fmtp:%d profile-level-id=1%s\r\n",
200 payload_type,
201 payload_type, config ? config : "");
202 break;
203 case CODEC_ID_AAC:
204 if (c->extradata_size) {
205 config = extradata2config(c);
206 } else {
207 /* FIXME: maybe we can forge config information based on the
208 * codec parameters...
209 */
210 av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported\n");
211 return NULL;
212 }
213 if (config == NULL) {
214 return NULL;
215 }
216 av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n"
217 "a=fmtp:%d profile-level-id=1;"
218 "mode=AAC-hbr;sizelength=13;indexlength=3;"
219 "indexdeltalength=3%s\r\n",
220 payload_type, c->sample_rate, c->channels,
221 payload_type, config);
222 break;
223 case CODEC_ID_PCM_S16BE:
224 if (payload_type >= 96)
225 av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n",
226 payload_type,
227 c->sample_rate, c->channels);
228 break;
229 case CODEC_ID_PCM_MULAW:
230 if (payload_type >= 96)
231 av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n",
232 payload_type,
233 c->sample_rate, c->channels);
234 break;
235 case CODEC_ID_PCM_ALAW:
236 if (payload_type >= 96)
237 av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n",
238 payload_type,
239 c->sample_rate, c->channels);
240 break;
241 default:
242 /* Nothing special to do, here... */
243 break;
244 }
245
246 av_free(config);
247
248 return buff;
249 }
250
251 static void sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, int port, int ttl)
252 {
253 const char *type;
254 int payload_type;
255
256 payload_type = rtp_get_payload_type(c);
257 if (payload_type < 0) {
258 payload_type = 96; /* FIXME: how to assign a private pt? rtp.c is broken too */
259 }
260
261 switch (c->codec_type) {
262 case CODEC_TYPE_VIDEO : type = "video" ; break;
263 case CODEC_TYPE_AUDIO : type = "audio" ; break;
264 case CODEC_TYPE_SUBTITLE: type = "text" ; break;
265 default : type = "application"; break;
266 }
267
268 av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);
269 dest_write(buff, size, dest_addr, ttl);
270 if (c->bit_rate) {
271 av_strlcatf(buff, size, "b=AS:%d\r\n", c->bit_rate / 1000);
272 }
273
274 sdp_media_attributes(buff, size, c, payload_type);
275 }
276
277 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
278 {
279 struct sdp_session_level s;
280 int i, j, port, ttl;
281 char dst[32];
282
283 memset(buff, 0, size);
284 memset(&s, 0, sizeof(struct sdp_session_level));
285 s.user = "-";
286 s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */
287 s.name = ac[0]->title;
288
289 port = 0;
290 ttl = 0;
291 if (n_files == 1) {
292 port = get_address(dst, sizeof(dst), &ttl, ac[0]->filename);
293 if (port > 0) {
294 s.dst_addr = dst;
295 s.ttl = ttl;
296 }
297 }
298 sdp_write_header(buff, size, &s);
299
300 dst[0] = 0;
301 for (i = 0; i < n_files; i++) {
302 if (n_files != 1) {
303 port = get_address(dst, sizeof(dst), &ttl, ac[i]->filename);
304 }
305 for (j = 0; j < ac[i]->nb_streams; j++) {
306 sdp_write_media(buff, size,
307 ac[i]->streams[j]->codec, dst[0] ? dst : NULL,
308 (port > 0) ? port + j * 2 : 0, ttl);
309 if (port <= 0) {
310 av_strlcatf(buff, size,
311 "a=control:streamid=%d\r\n", i + j);
312 }
313 }
314 }
315
316 return 0;
317 }
318 #else
319 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
320 {
321 return AVERROR(ENOSYS);
322 }
323 #endif