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"
30 #define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2)
32 struct sdp_session_level {
33 int sdp_version; /**< protocol version (currently 0) */
34 int id; /**< session ID */
35 int version; /**< session version */
36 int start_time; /**< session start time (NTP time, in seconds),
37 or 0 in case of permanent session */
38 int end_time; /**< session end time (NTP time, in seconds),
39 or 0 if the session is not bounded */
40 int ttl; /**< TTL, in case of multicast stream */
41 const char *user; /**< username of the session's creator */
42 const char *src_addr; /**< IP address of the machine from which the session was created */
43 const char *dst_addr; /**< destination IP address (can be multicast) */
44 const char *name; /**< session name (can be an empty string) */
47 static void sdp_write_address(char *buff, int size, const char *dest_addr, int ttl)
51 av_strlcatf(buff, size, "c=IN IP4 %s/%d\r\n", dest_addr, ttl);
53 av_strlcatf(buff, size, "c=IN IP4 %s\r\n", dest_addr);
58 static void sdp_write_header(char *buff, int size, struct sdp_session_level *s)
60 av_strlcatf(buff, size, "v=%d\r\n"
61 "o=- %d %d IN IP4 %s\r\n"
64 s->id, s->version, s->src_addr,
66 sdp_write_address(buff, size, s->dst_addr, s->ttl);
67 av_strlcatf(buff, size, "t=%d %d\r\n"
68 "a=tool:libavformat " AV_STRINGIFY(LIBAVFORMAT_VERSION) "\r\n",
69 s->start_time, s->end_time);
72 static int sdp_get_address(char *dest_addr, int size, int *ttl, const char *url)
78 url_split(proto, sizeof(proto), NULL, 0, dest_addr, size, &port, NULL, 0, url);
82 if (strcmp(proto, "rtp")) {
83 /* The url isn't for the actual rtp sessions,
84 * don't parse out anything else than the destination.
92 int is_multicast = find_info_tag(buff, sizeof(buff), "multicast", p);
95 if (find_info_tag(buff, sizeof(buff), "ttl", p)) {
96 *ttl = strtol(buff, NULL, 10);
106 #define MAX_PSET_SIZE 1024
107 static char *extradata2psets(AVCodecContext *c)
111 const char *pset_string = "; sprop-parameter-sets=";
113 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
114 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
119 psets = av_mallocz(MAX_PSET_SIZE);
121 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n");
124 memcpy(psets, pset_string, strlen(pset_string));
125 p = psets + strlen(pset_string);
126 r = ff_avc_find_startcode(c->extradata, c->extradata + c->extradata_size);
127 while (r < c->extradata + c->extradata_size) {
132 nal_type = *r & 0x1f;
133 r1 = ff_avc_find_startcode(r, c->extradata + c->extradata_size);
134 if (nal_type != 7 && nal_type != 8) { /* Only output SPS and PPS */
138 if (p != (psets + strlen(pset_string))) {
142 if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) {
143 av_log(c, AV_LOG_ERROR, "Cannot Base64-encode %td %td!\n", MAX_PSET_SIZE - (p - psets), r1 - r);
155 static char *extradata2config(AVCodecContext *c)
159 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
160 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
164 config = av_malloc(10 + c->extradata_size * 2);
165 if (config == NULL) {
166 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
169 memcpy(config, "; config=", 9);
170 ff_data_to_hex(config + 9, c->extradata, c->extradata_size);
171 config[9 + c->extradata_size * 2] = 0;
176 static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type)
180 switch (c->codec_id) {
182 if (c->extradata_size) {
183 config = extradata2psets(c);
185 av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n"
186 "a=fmtp:%d packetization-mode=1%s\r\n",
188 payload_type, config ? config : "");
192 av_strlcatf(buff, size, "a=rtpmap:%d H263-2000/90000\r\n", payload_type);
195 if (c->extradata_size) {
196 config = extradata2config(c);
198 av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"
199 "a=fmtp:%d profile-level-id=1%s\r\n",
201 payload_type, config ? config : "");
204 if (c->extradata_size) {
205 config = extradata2config(c);
207 /* FIXME: maybe we can forge config information based on the
208 * codec parameters...
210 av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n");
213 if (config == NULL) {
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);
223 case CODEC_ID_PCM_S16BE:
224 if (payload_type >= RTP_PT_PRIVATE)
225 av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n",
227 c->sample_rate, c->channels);
229 case CODEC_ID_PCM_MULAW:
230 if (payload_type >= RTP_PT_PRIVATE)
231 av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n",
233 c->sample_rate, c->channels);
235 case CODEC_ID_PCM_ALAW:
236 if (payload_type >= RTP_PT_PRIVATE)
237 av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n",
239 c->sample_rate, c->channels);
241 case CODEC_ID_AMR_NB:
242 av_strlcatf(buff, size, "a=rtpmap:%d AMR/%d/%d\r\n"
243 "a=fmtp:%d octet-align=1\r\n",
244 payload_type, c->sample_rate, c->channels,
247 case CODEC_ID_AMR_WB:
248 av_strlcatf(buff, size, "a=rtpmap:%d AMR-WB/%d/%d\r\n"
249 "a=fmtp:%d octet-align=1\r\n",
250 payload_type, c->sample_rate, c->channels,
254 /* Nothing special to do here... */
263 static void sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, int port, int ttl)
268 payload_type = ff_rtp_get_payload_type(c);
269 if (payload_type < 0) {
270 payload_type = RTP_PT_PRIVATE + (c->codec_type == CODEC_TYPE_AUDIO);
273 switch (c->codec_type) {
274 case CODEC_TYPE_VIDEO : type = "video" ; break;
275 case CODEC_TYPE_AUDIO : type = "audio" ; break;
276 case CODEC_TYPE_SUBTITLE: type = "text" ; break;
277 default : type = "application"; break;
280 av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);
281 sdp_write_address(buff, size, dest_addr, ttl);
283 av_strlcatf(buff, size, "b=AS:%d\r\n", c->bit_rate / 1000);
286 sdp_write_media_attributes(buff, size, c, payload_type);
289 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
291 AVMetadataTag *title = av_metadata_get(ac[0]->metadata, "title", NULL, 0);
292 struct sdp_session_level s;
296 memset(buff, 0, size);
297 memset(&s, 0, sizeof(struct sdp_session_level));
299 s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */
300 s.name = title ? title->value : "No Name";
305 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[0]->filename);
311 sdp_write_header(buff, size, &s);
314 for (i = 0; i < n_files; i++) {
316 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[i]->filename);
318 for (j = 0; j < ac[i]->nb_streams; j++) {
319 sdp_write_media(buff, size,
320 ac[i]->streams[j]->codec, dst[0] ? dst : NULL,
321 (port > 0) ? port + j * 2 : 0, ttl);
323 av_strlcatf(buff, size,
324 "a=control:streamid=%d\r\n", i + j);
332 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
334 return AVERROR(ENOSYS);