2 * copyright (c) 2007 Luca Abeni
4 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/avstring.h"
23 #include "libavutil/base64.h"
33 #define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2)
35 struct sdp_session_level {
36 int sdp_version; /**< protocol version (currently 0) */
37 int id; /**< session ID */
38 int version; /**< session version */
39 int start_time; /**< session start time (NTP time, in seconds),
40 or 0 in case of permanent session */
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) */
50 static void sdp_write_address(char *buff, int size, const char *dest_addr, int ttl)
54 av_strlcatf(buff, size, "c=IN IP4 %s/%d\r\n", dest_addr, ttl);
56 av_strlcatf(buff, size, "c=IN IP4 %s\r\n", dest_addr);
61 static void sdp_write_header(char *buff, int size, struct sdp_session_level *s)
63 av_strlcatf(buff, size, "v=%d\r\n"
64 "o=- %d %d IN IP4 %s\r\n"
67 s->id, s->version, s->src_addr,
69 sdp_write_address(buff, size, s->dst_addr, s->ttl);
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);
76 static void resolve_destination(char *dest_addr, int size)
78 struct addrinfo hints, *ai, *cur;
83 /* Resolve the destination, since it must be written
84 * as a numeric IP address in the SDP. */
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))
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);
101 static void resolve_destination(char *dest_addr, int size)
106 static int sdp_get_address(char *dest_addr, int size, int *ttl, const char *url)
112 ff_url_split(proto, sizeof(proto), NULL, 0, dest_addr, size, &port, NULL, 0, url);
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.
123 p = strchr(url, '?');
126 int is_multicast = find_info_tag(buff, sizeof(buff), "multicast", p);
129 if (find_info_tag(buff, sizeof(buff), "ttl", p)) {
130 *ttl = strtol(buff, NULL, 10);
140 #define MAX_PSET_SIZE 1024
141 static char *extradata2psets(AVCodecContext *c)
145 const char *pset_string = "; sprop-parameter-sets=";
147 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
148 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
153 psets = av_mallocz(MAX_PSET_SIZE);
155 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n");
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) {
166 nal_type = *r & 0x1f;
167 r1 = ff_avc_find_startcode(r, c->extradata + c->extradata_size);
168 if (nal_type != 7 && nal_type != 8) { /* Only output SPS and PPS */
172 if (p != (psets + strlen(pset_string))) {
176 if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) {
177 av_log(c, AV_LOG_ERROR, "Cannot Base64-encode %td %td!\n", MAX_PSET_SIZE - (p - psets), r1 - r);
189 static char *extradata2config(AVCodecContext *c)
193 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
194 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
198 config = av_malloc(10 + c->extradata_size * 2);
199 if (config == NULL) {
200 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
203 memcpy(config, "; config=", 9);
204 ff_data_to_hex(config + 9, c->extradata, c->extradata_size, 0);
205 config[9 + c->extradata_size * 2] = 0;
210 static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type)
214 switch (c->codec_id) {
216 if (c->extradata_size) {
217 config = extradata2psets(c);
219 av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n"
220 "a=fmtp:%d packetization-mode=1%s\r\n",
222 payload_type, config ? config : "");
226 av_strlcatf(buff, size, "a=rtpmap:%d H263-2000/90000\r\n", payload_type);
229 if (c->extradata_size) {
230 config = extradata2config(c);
232 av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"
233 "a=fmtp:%d profile-level-id=1%s\r\n",
235 payload_type, config ? config : "");
238 if (c->extradata_size) {
239 config = extradata2config(c);
241 /* FIXME: maybe we can forge config information based on the
242 * codec parameters...
244 av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n");
247 if (config == NULL) {
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);
257 case CODEC_ID_PCM_S16BE:
258 if (payload_type >= RTP_PT_PRIVATE)
259 av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n",
261 c->sample_rate, c->channels);
263 case CODEC_ID_PCM_MULAW:
264 if (payload_type >= RTP_PT_PRIVATE)
265 av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n",
267 c->sample_rate, c->channels);
269 case CODEC_ID_PCM_ALAW:
270 if (payload_type >= RTP_PT_PRIVATE)
271 av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n",
273 c->sample_rate, c->channels);
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,
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,
288 /* Nothing special to do here... */
297 static void sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, int port, int ttl)
302 payload_type = ff_rtp_get_payload_type(c);
303 if (payload_type < 0) {
304 payload_type = RTP_PT_PRIVATE + (c->codec_type == AVMEDIA_TYPE_AUDIO);
307 switch (c->codec_type) {
308 case AVMEDIA_TYPE_VIDEO : type = "video" ; break;
309 case AVMEDIA_TYPE_AUDIO : type = "audio" ; break;
310 case AVMEDIA_TYPE_SUBTITLE: type = "text" ; break;
311 default : type = "application"; break;
314 av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);
315 sdp_write_address(buff, size, dest_addr, ttl);
317 av_strlcatf(buff, size, "b=AS:%d\r\n", c->bit_rate / 1000);
320 sdp_write_media_attributes(buff, size, c, payload_type);
323 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
325 AVMetadataTag *title = av_metadata_get(ac[0]->metadata, "title", NULL, 0);
326 struct sdp_session_level s;
330 memset(buff, 0, size);
331 memset(&s, 0, sizeof(struct sdp_session_level));
333 s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */
334 s.name = title ? title->value : "No Name";
339 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[0]->filename);
340 resolve_destination(dst, sizeof(dst));
346 sdp_write_header(buff, size, &s);
349 for (i = 0; i < n_files; i++) {
351 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[i]->filename);
352 resolve_destination(dst, sizeof(dst));
354 for (j = 0; j < ac[i]->nb_streams; j++) {
355 sdp_write_media(buff, size,
356 ac[i]->streams[j]->codec, dst[0] ? dst : NULL,
357 (port > 0) ? port + j * 2 : 0, ttl);
359 av_strlcatf(buff, size,
360 "a=control:streamid=%d\r\n", i + j);
368 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
370 return AVERROR(ENOSYS);