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
24 #ifdef CONFIG_RTP_MUXER
25 #define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2)
27 struct sdp_session_level {
28 int sdp_version; /**< protocol version (currently 0) */
29 int id; /**< session id */
30 int version; /**< session version */
31 int start_time; /**< session start time (NTP time, in seconds),
32 or 0 in case of permanent session */
33 int end_time; /**< session end time (NTP time, in seconds),
34 or 0 if the session is not bounded */
35 int ttl; /**< TTL, in case of multicast stream */
36 const char *user; /**< username of the session's creator */
37 const char *src_addr; /**< IP address of the machine from which the session was created */
38 const char *dst_addr; /**< destination IP address (can be multicast) */
39 const char *name; /**< session name (can be an empty string) */
42 static void dest_write(char *buff, int size, const char *dest_addr, int ttl)
46 av_strlcatf(buff, size, "c=IN IP4 %s/%d\r\n", dest_addr, ttl);
48 av_strlcatf(buff, size, "c=IN IP4 %s\r\n", dest_addr);
53 static void sdp_write_header(char *buff, int size, struct sdp_session_level *s)
55 av_strlcatf(buff, size, "v=%d\r\n"
56 "o=- %d %d IN IPV4 %s\r\n"
59 "a=tool:libavformat\r\n",
61 s->id, s->version, s->src_addr,
62 s->start_time, s->end_time,
63 s->name[0] ? s->name : "No Name");
64 dest_write(buff, size, s->dst_addr, s->ttl);
67 static int get_address(char *dest_addr, int size, int *ttl, const char *url)
72 url_split(NULL, 0, NULL, 0, dest_addr, size, &port, NULL, 0, url);
78 int is_multicast = find_info_tag(buff, sizeof(buff), "multicast", p);
81 if (find_info_tag(buff, sizeof(buff), "ttl", p)) {
82 *ttl = strtol(buff, NULL, 10);
92 static void digit_to_char(char *dst, uint8_t src)
97 *dst = 'A' + src - 10;
101 static char *data_to_hex(char *buff, const uint8_t *src, int s)
105 for(i = 0; i < s; i++) {
106 digit_to_char(buff + 2 * i, src[i] >> 4);
107 digit_to_char(buff + 2 * i + 1, src[i] & 0xF);
113 static char *sdp_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type)
117 switch (c->codec_id) {
119 if (c->flags & CODEC_FLAG_GLOBAL_HEADER) {
120 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
121 av_log(NULL, AV_LOG_ERROR, "Too many extra data!\n");
125 config = av_malloc(10 + c->extradata_size * 2);
126 if (config == NULL) {
127 av_log(NULL, AV_LOG_ERROR, "Cannot allocate memory for the config info\n");
130 memcpy(config, "; config=", 9);
131 data_to_hex(config + 9, c->extradata, c->extradata_size);
132 config[9 + c->extradata_size * 2] = 0;
134 av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"
135 "a=fmtp:%d profile-level-id=1%s\r\n",
137 payload_type, config ? config : "");
140 /* Nothing special to do, here... */
149 static void sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, int port, int ttl)
154 payload_type = rtp_get_payload_type(c);
155 if (payload_type < 0) {
156 payload_type = 96; /* FIXME: how to assign a private pt? rtp.c is broken too */
159 switch (c->codec_type) {
160 case CODEC_TYPE_VIDEO : type = "video" ; break;
161 case CODEC_TYPE_AUDIO : type = "audio" ; break;
162 case CODEC_TYPE_SUBTITLE: type = "text" ; break;
163 default : type = "application"; break;
166 av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);
167 dest_write(buff, size, dest_addr, ttl);
169 sdp_media_attributes(buff, size, c, payload_type);
172 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
174 struct sdp_session_level s;
178 memset(&s, 0, sizeof(struct sdp_session_level));
180 s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */
181 s.name = ac[0]->title;
186 port = get_address(dst, sizeof(dst), &ttl, ac[0]->filename);
192 sdp_write_header(buff, size, &s);
195 for (i = 0; i < n_files; i++) {
197 port = get_address(dst, sizeof(dst), &ttl, ac[i]->filename);
199 for (j = 0; j < ac[i]->nb_streams; j++) {
200 sdp_write_media(buff, size,
201 ac[i]->streams[j]->codec, dst[0] ? dst : NULL,
202 (port > 0) ? port + j * 2 : 0, ttl);
204 av_strlcatf(buff, size,
205 "a=control:streamid=%d\r\n", i + j);
213 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
215 return AVERROR(ENOSYS);