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
21 #include "libavutil/avstring.h"
22 #include "libavutil/base64.h"
28 #ifdef CONFIG_RTP_MUXER
29 #define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2)
31 struct sdp_session_level {
32 int sdp_version; /**< protocol version (currently 0) */
33 int id; /**< session id */
34 int version; /**< session version */
35 int start_time; /**< session start time (NTP time, in seconds),
36 or 0 in case of permanent session */
37 int end_time; /**< session end time (NTP time, in seconds),
38 or 0 if the session is not bounded */
39 int ttl; /**< TTL, in case of multicast stream */
40 const char *user; /**< username of the session's creator */
41 const char *src_addr; /**< IP address of the machine from which the session was created */
42 const char *dst_addr; /**< destination IP address (can be multicast) */
43 const char *name; /**< session name (can be an empty string) */
46 static void sdp_write_address(char *buff, int size, const char *dest_addr, int ttl)
50 av_strlcatf(buff, size, "c=IN IP4 %s/%d\r\n", dest_addr, ttl);
52 av_strlcatf(buff, size, "c=IN IP4 %s\r\n", dest_addr);
57 static void sdp_write_header(char *buff, int size, struct sdp_session_level *s)
59 av_strlcatf(buff, size, "v=%d\r\n"
60 "o=- %d %d IN IP4 %s\r\n"
63 "a=tool:libavformat " AV_STRINGIFY(LIBAVFORMAT_VERSION) "\r\n",
65 s->id, s->version, s->src_addr,
66 s->start_time, s->end_time,
67 s->name[0] ? s->name : "No Name");
68 sdp_write_address(buff, size, s->dst_addr, s->ttl);
71 static int sdp_get_address(char *dest_addr, int size, int *ttl, const char *url)
76 url_split(NULL, 0, NULL, 0, dest_addr, size, &port, NULL, 0, url);
82 int is_multicast = find_info_tag(buff, sizeof(buff), "multicast", p);
85 if (find_info_tag(buff, sizeof(buff), "ttl", p)) {
86 *ttl = strtol(buff, NULL, 10);
96 #define MAX_PSET_SIZE 1024
97 static char *extradata2psets(AVCodecContext *c)
101 const char *pset_string = "; sprop-parameter-sets=";
103 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
104 av_log(c, AV_LOG_ERROR, "Too many extra data!\n");
109 psets = av_mallocz(MAX_PSET_SIZE);
111 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets\n");
114 memcpy(psets, pset_string, strlen(pset_string));
115 p = psets + strlen(pset_string);
116 r = ff_avc_find_startcode(c->extradata, c->extradata + c->extradata_size);
117 while (r < c->extradata + c->extradata_size) {
121 r1 = ff_avc_find_startcode(r, c->extradata + c->extradata_size);
122 if (p != (psets + strlen(pset_string))) {
126 if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) {
127 av_log(c, AV_LOG_ERROR, "Cannot BASE64 encode %td %td!\n", MAX_PSET_SIZE - (p - psets), r1 - r);
139 static char *extradata2config(AVCodecContext *c)
143 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
144 av_log(c, AV_LOG_ERROR, "Too many extra data!\n");
148 config = av_malloc(10 + c->extradata_size * 2);
149 if (config == NULL) {
150 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info\n");
153 memcpy(config, "; config=", 9);
154 ff_data_to_hex(config + 9, c->extradata, c->extradata_size);
155 config[9 + c->extradata_size * 2] = 0;
160 static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type)
164 switch (c->codec_id) {
166 if (c->extradata_size) {
167 config = extradata2psets(c);
169 av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n"
170 "a=fmtp:%d packetization-mode=1%s\r\n",
172 payload_type, config ? config : "");
175 if (c->extradata_size) {
176 config = extradata2config(c);
178 av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"
179 "a=fmtp:%d profile-level-id=1%s\r\n",
181 payload_type, config ? config : "");
184 if (c->extradata_size) {
185 config = extradata2config(c);
187 /* FIXME: maybe we can forge config information based on the
188 * codec parameters...
190 av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported\n");
193 if (config == NULL) {
196 av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n"
197 "a=fmtp:%d profile-level-id=1;"
198 "mode=AAC-hbr;sizelength=13;indexlength=3;"
199 "indexdeltalength=3%s\r\n",
200 payload_type, c->sample_rate, c->channels,
201 payload_type, config);
203 case CODEC_ID_PCM_S16BE:
204 if (payload_type >= 96)
205 av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n",
207 c->sample_rate, c->channels);
209 case CODEC_ID_PCM_MULAW:
210 if (payload_type >= 96)
211 av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n",
213 c->sample_rate, c->channels);
215 case CODEC_ID_PCM_ALAW:
216 if (payload_type >= 96)
217 av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n",
219 c->sample_rate, c->channels);
222 /* Nothing special to do, here... */
231 static void sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, int port, int ttl)
236 payload_type = rtp_get_payload_type(c);
237 if (payload_type < 0) {
238 payload_type = 96; /* FIXME: how to assign a private pt? rtp.c is broken too */
241 switch (c->codec_type) {
242 case CODEC_TYPE_VIDEO : type = "video" ; break;
243 case CODEC_TYPE_AUDIO : type = "audio" ; break;
244 case CODEC_TYPE_SUBTITLE: type = "text" ; break;
245 default : type = "application"; break;
248 av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);
249 sdp_write_address(buff, size, dest_addr, ttl);
251 av_strlcatf(buff, size, "b=AS:%d\r\n", c->bit_rate / 1000);
254 sdp_write_media_attributes(buff, size, c, payload_type);
257 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
259 struct sdp_session_level s;
263 memset(buff, 0, size);
264 memset(&s, 0, sizeof(struct sdp_session_level));
266 s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */
267 s.name = ac[0]->title;
272 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[0]->filename);
278 sdp_write_header(buff, size, &s);
281 for (i = 0; i < n_files; i++) {
283 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[i]->filename);
285 for (j = 0; j < ac[i]->nb_streams; j++) {
286 sdp_write_media(buff, size,
287 ac[i]->streams[j]->codec, dst[0] ? dst : NULL,
288 (port > 0) ? port + j * 2 : 0, ttl);
290 av_strlcatf(buff, size,
291 "a=control:streamid=%d\r\n", i + j);
299 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
301 return AVERROR(ENOSYS);