10l: audio_buf is already a uint8_t* so no need to cast it
[libav.git] / libavformat / sdp.c
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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
c47b0738 21#include <string.h>
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22#include "libavutil/avstring.h"
23#include "libavutil/base64.h"
c5388c07 24#include "avformat.h"
f1c80e35 25#include "internal.h"
29e35d67 26#include "avc.h"
759d98d0 27#include "rtp.h"
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28#if CONFIG_NETWORK
29#include "network.h"
30#endif
c5388c07 31
b250f9c6 32#if CONFIG_RTP_MUXER
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33#define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2)
34
35struct sdp_session_level {
36 int sdp_version; /**< protocol version (currently 0) */
7be75dd7 37 int id; /**< session ID */
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38 int version; /**< session version */
39 int start_time; /**< session start time (NTP time, in seconds),
7be75dd7 40 or 0 in case of permanent session */
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41 int end_time; /**< session end time (NTP time, in seconds),
42 or 0 if the session is not bounded */
43 int ttl; /**< TTL, in case of multicast stream */
44 const char *user; /**< username of the session's creator */
45 const char *src_addr; /**< IP address of the machine from which the session was created */
46 const char *dst_addr; /**< destination IP address (can be multicast) */
47 const char *name; /**< session name (can be an empty string) */
48};
49
91cd7eb6 50static void sdp_write_address(char *buff, int size, const char *dest_addr, int ttl)
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51{
52 if (dest_addr) {
53 if (ttl > 0) {
54 av_strlcatf(buff, size, "c=IN IP4 %s/%d\r\n", dest_addr, ttl);
55 } else {
56 av_strlcatf(buff, size, "c=IN IP4 %s\r\n", dest_addr);
57 }
58 }
59}
60
61static void sdp_write_header(char *buff, int size, struct sdp_session_level *s)
62{
63 av_strlcatf(buff, size, "v=%d\r\n"
c16184e9 64 "o=- %d %d IN IP4 %s\r\n"
56e6f830 65 "s=%s\r\n",
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66 s->sdp_version,
67 s->id, s->version, s->src_addr,
f3650b23 68 s->name);
91cd7eb6 69 sdp_write_address(buff, size, s->dst_addr, s->ttl);
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70 av_strlcatf(buff, size, "t=%d %d\r\n"
71 "a=tool:libavformat " AV_STRINGIFY(LIBAVFORMAT_VERSION) "\r\n",
72 s->start_time, s->end_time);
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73}
74
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75#if CONFIG_NETWORK
76static void resolve_destination(char *dest_addr, int size)
77{
78 struct addrinfo hints, *ai, *cur;
79
80 if (!dest_addr[0])
81 return;
82
83 /* Resolve the destination, since it must be written
84 * as a numeric IP address in the SDP. */
85
86 memset(&hints, 0, sizeof(hints));
87 /* We only support IPv4 addresses in the SDP at the moment. */
88 hints.ai_family = AF_INET;
89 if (getaddrinfo(dest_addr, NULL, &hints, &ai))
90 return;
91 for (cur = ai; cur; cur = cur->ai_next) {
92 if (cur->ai_family == AF_INET) {
93 getnameinfo(cur->ai_addr, cur->ai_addrlen, dest_addr, size,
94 NULL, 0, NI_NUMERICHOST);
95 break;
96 }
97 }
98 freeaddrinfo(ai);
99}
100#else
101static void resolve_destination(char *dest_addr, int size)
102{
103}
104#endif
105
91cd7eb6 106static int sdp_get_address(char *dest_addr, int size, int *ttl, const char *url)
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107{
108 int port;
109 const char *p;
c47b0738 110 char proto[32];
c5388c07 111
c5c6e67c 112 ff_url_split(proto, sizeof(proto), NULL, 0, dest_addr, size, &port, NULL, 0, url);
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113
114 *ttl = 0;
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115
116 if (strcmp(proto, "rtp")) {
117 /* The url isn't for the actual rtp sessions,
118 * don't parse out anything else than the destination.
119 */
120 return 0;
121 }
122
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123 p = strchr(url, '?');
124 if (p) {
125 char buff[64];
126 int is_multicast = find_info_tag(buff, sizeof(buff), "multicast", p);
127
128 if (is_multicast) {
129 if (find_info_tag(buff, sizeof(buff), "ttl", p)) {
130 *ttl = strtol(buff, NULL, 10);
131 } else {
132 *ttl = 5;
133 }
134 }
135 }
136
137 return port;
138}
139
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140#define MAX_PSET_SIZE 1024
141static char *extradata2psets(AVCodecContext *c)
142{
143 char *psets, *p;
a1fc4d4a 144 const uint8_t *r;
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145 const char *pset_string = "; sprop-parameter-sets=";
146
147 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
7be75dd7 148 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
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149
150 return NULL;
151 }
152
153 psets = av_mallocz(MAX_PSET_SIZE);
154 if (psets == NULL) {
7be75dd7 155 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n");
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156 return NULL;
157 }
158 memcpy(psets, pset_string, strlen(pset_string));
159 p = psets + strlen(pset_string);
160 r = ff_avc_find_startcode(c->extradata, c->extradata + c->extradata_size);
161 while (r < c->extradata + c->extradata_size) {
a1fc4d4a 162 const uint8_t *r1;
99f373f3 163 uint8_t nal_type;
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164
165 while (!*(r++));
99f373f3 166 nal_type = *r & 0x1f;
29e35d67 167 r1 = ff_avc_find_startcode(r, c->extradata + c->extradata_size);
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168 if (nal_type != 7 && nal_type != 8) { /* Only output SPS and PPS */
169 r = r1;
170 continue;
171 }
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172 if (p != (psets + strlen(pset_string))) {
173 *p = ',';
174 p++;
175 }
176 if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) {
7be75dd7 177 av_log(c, AV_LOG_ERROR, "Cannot Base64-encode %td %td!\n", MAX_PSET_SIZE - (p - psets), r1 - r);
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178 av_free(psets);
179
180 return NULL;
181 }
182 p += strlen(p);
183 r = r1;
184 }
185
186 return psets;
187}
188
81ab1fa1 189static char *extradata2config(AVCodecContext *c)
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190{
191 char *config;
192
81ab1fa1 193 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
7be75dd7 194 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
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195
196 return NULL;
197 }
81ab1fa1 198 config = av_malloc(10 + c->extradata_size * 2);
4901263a 199 if (config == NULL) {
7be75dd7 200 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
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201 return NULL;
202 }
203 memcpy(config, "; config=", 9);
ddbeb954 204 ff_data_to_hex(config + 9, c->extradata, c->extradata_size, 0);
81ab1fa1 205 config[9 + c->extradata_size * 2] = 0;
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206
207 return config;
208}
209
91cd7eb6 210static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type)
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211{
212 char *config = NULL;
213
214 switch (c->codec_id) {
b21cd0bc 215 case CODEC_ID_H264:
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216 if (c->extradata_size) {
217 config = extradata2psets(c);
218 }
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219 av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n"
220 "a=fmtp:%d packetization-mode=1%s\r\n",
221 payload_type,
222 payload_type, config ? config : "");
223 break;
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224 case CODEC_ID_H263:
225 case CODEC_ID_H263P:
226 av_strlcatf(buff, size, "a=rtpmap:%d H263-2000/90000\r\n", payload_type);
227 break;
c5388c07 228 case CODEC_ID_MPEG4:
21b37480 229 if (c->extradata_size) {
81ab1fa1 230 config = extradata2config(c);
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231 }
232 av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"
233 "a=fmtp:%d profile-level-id=1%s\r\n",
234 payload_type,
235 payload_type, config ? config : "");
236 break;
4901263a 237 case CODEC_ID_AAC:
21b37480 238 if (c->extradata_size) {
81ab1fa1 239 config = extradata2config(c);
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240 } else {
241 /* FIXME: maybe we can forge config information based on the
242 * codec parameters...
243 */
7be75dd7 244 av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n");
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245 return NULL;
246 }
247 if (config == NULL) {
248 return NULL;
249 }
250 av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n"
251 "a=fmtp:%d profile-level-id=1;"
252 "mode=AAC-hbr;sizelength=13;indexlength=3;"
253 "indexdeltalength=3%s\r\n",
254 payload_type, c->sample_rate, c->channels,
255 payload_type, config);
256 break;
c9215bab 257 case CODEC_ID_PCM_S16BE:
f877954f 258 if (payload_type >= RTP_PT_PRIVATE)
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259 av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n",
260 payload_type,
261 c->sample_rate, c->channels);
262 break;
263 case CODEC_ID_PCM_MULAW:
f877954f 264 if (payload_type >= RTP_PT_PRIVATE)
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265 av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n",
266 payload_type,
267 c->sample_rate, c->channels);
268 break;
269 case CODEC_ID_PCM_ALAW:
f877954f 270 if (payload_type >= RTP_PT_PRIVATE)
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271 av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n",
272 payload_type,
273 c->sample_rate, c->channels);
274 break;
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275 case CODEC_ID_AMR_NB:
276 av_strlcatf(buff, size, "a=rtpmap:%d AMR/%d/%d\r\n"
277 "a=fmtp:%d octet-align=1\r\n",
278 payload_type, c->sample_rate, c->channels,
279 payload_type);
280 break;
281 case CODEC_ID_AMR_WB:
282 av_strlcatf(buff, size, "a=rtpmap:%d AMR-WB/%d/%d\r\n"
283 "a=fmtp:%d octet-align=1\r\n",
284 payload_type, c->sample_rate, c->channels,
285 payload_type);
286 break;
c5388c07 287 default:
7be75dd7 288 /* Nothing special to do here... */
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289 break;
290 }
291
292 av_free(config);
293
294 return buff;
295}
296
0341b699 297void ff_sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, int port, int ttl)
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298{
299 const char *type;
300 int payload_type;
301
0550b58f 302 payload_type = ff_rtp_get_payload_type(c);
c5388c07 303 if (payload_type < 0) {
72415b2a 304 payload_type = RTP_PT_PRIVATE + (c->codec_type == AVMEDIA_TYPE_AUDIO);
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305 }
306
307 switch (c->codec_type) {
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308 case AVMEDIA_TYPE_VIDEO : type = "video" ; break;
309 case AVMEDIA_TYPE_AUDIO : type = "audio" ; break;
310 case AVMEDIA_TYPE_SUBTITLE: type = "text" ; break;
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311 default : type = "application"; break;
312 }
313
314 av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);
91cd7eb6 315 sdp_write_address(buff, size, dest_addr, ttl);
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316 if (c->bit_rate) {
317 av_strlcatf(buff, size, "b=AS:%d\r\n", c->bit_rate / 1000);
318 }
c5388c07 319
91cd7eb6 320 sdp_write_media_attributes(buff, size, c, payload_type);
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321}
322
8767b80f 323int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
c5388c07 324{
f3650b23 325 AVMetadataTag *title = av_metadata_get(ac[0]->metadata, "title", NULL, 0);
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326 struct sdp_session_level s;
327 int i, j, port, ttl;
328 char dst[32];
329
5f2cbb53 330 memset(buff, 0, size);
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331 memset(&s, 0, sizeof(struct sdp_session_level));
332 s.user = "-";
333 s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */
f3650b23 334 s.name = title ? title->value : "No Name";
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335
336 port = 0;
337 ttl = 0;
338 if (n_files == 1) {
91cd7eb6 339 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[0]->filename);
51a269cd 340 resolve_destination(dst, sizeof(dst));
9ea7f03a 341 if (dst[0]) {
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342 s.dst_addr = dst;
343 s.ttl = ttl;
344 }
345 }
8767b80f 346 sdp_write_header(buff, size, &s);
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347
348 dst[0] = 0;
349 for (i = 0; i < n_files; i++) {
350 if (n_files != 1) {
91cd7eb6 351 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[i]->filename);
51a269cd 352 resolve_destination(dst, sizeof(dst));
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353 }
354 for (j = 0; j < ac[i]->nb_streams; j++) {
0341b699 355 ff_sdp_write_media(buff, size,
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356 ac[i]->streams[j]->codec, dst[0] ? dst : NULL,
357 (port > 0) ? port + j * 2 : 0, ttl);
358 if (port <= 0) {
8767b80f 359 av_strlcatf(buff, size,
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360 "a=control:streamid=%d\r\n", i + j);
361 }
362 }
363 }
364
8767b80f 365 return 0;
c5388c07 366}
7ba32703 367#else
8767b80f 368int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
7ba32703 369{
8767b80f 370 return AVERROR(ENOSYS);
7ba32703 371}
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372
373void ff_sdp_write_media(char *buff, int size, AVCodecContext *c,
374 const char *dest_addr, int port, int ttl)
375{
376}
7ba32703 377#endif