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"
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,
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 much extradata!\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) {
122 nal_type = *r & 0x1f;
123 r1 = ff_avc_find_startcode(r, c->extradata + c->extradata_size);
124 if (nal_type != 7 && nal_type != 8) { /* Only output SPS and PPS */
128 if (p != (psets + strlen(pset_string))) {
132 if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) {
133 av_log(c, AV_LOG_ERROR, "Cannot Base64-encode %td %td!\n", MAX_PSET_SIZE - (p - psets), r1 - r);
145 static char *extradata2config(AVCodecContext *c)
149 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
150 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
154 config = av_malloc(10 + c->extradata_size * 2);
155 if (config == NULL) {
156 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
159 memcpy(config, "; config=", 9);
160 ff_data_to_hex(config + 9, c->extradata, c->extradata_size);
161 config[9 + c->extradata_size * 2] = 0;
166 static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type)
170 switch (c->codec_id) {
172 if (c->extradata_size) {
173 config = extradata2psets(c);
175 av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n"
176 "a=fmtp:%d packetization-mode=1%s\r\n",
178 payload_type, config ? config : "");
182 av_strlcatf(buff, size, "a=rtpmap:%d H263-2000/90000\r\n", payload_type);
185 if (c->extradata_size) {
186 config = extradata2config(c);
188 av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"
189 "a=fmtp:%d profile-level-id=1%s\r\n",
191 payload_type, config ? config : "");
194 if (c->extradata_size) {
195 config = extradata2config(c);
197 /* FIXME: maybe we can forge config information based on the
198 * codec parameters...
200 av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n");
203 if (config == NULL) {
206 av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n"
207 "a=fmtp:%d profile-level-id=1;"
208 "mode=AAC-hbr;sizelength=13;indexlength=3;"
209 "indexdeltalength=3%s\r\n",
210 payload_type, c->sample_rate, c->channels,
211 payload_type, config);
213 case CODEC_ID_PCM_S16BE:
214 if (payload_type >= 96)
215 av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n",
217 c->sample_rate, c->channels);
219 case CODEC_ID_PCM_MULAW:
220 if (payload_type >= 96)
221 av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n",
223 c->sample_rate, c->channels);
225 case CODEC_ID_PCM_ALAW:
226 if (payload_type >= 96)
227 av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n",
229 c->sample_rate, c->channels);
231 case CODEC_ID_AMR_NB:
232 av_strlcatf(buff, size, "a=rtpmap:%d AMR/%d/%d\r\n"
233 "a=fmtp:%d octet-align=1\r\n",
234 payload_type, c->sample_rate, c->channels,
237 case CODEC_ID_AMR_WB:
238 av_strlcatf(buff, size, "a=rtpmap:%d AMR-WB/%d/%d\r\n"
239 "a=fmtp:%d octet-align=1\r\n",
240 payload_type, c->sample_rate, c->channels,
244 /* Nothing special to do here... */
253 static void sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, int port, int ttl)
258 payload_type = ff_rtp_get_payload_type(c);
259 if (payload_type < 0) {
260 payload_type = 96; /* FIXME: how to assign a private pt? rtp.c is broken too */
263 switch (c->codec_type) {
264 case CODEC_TYPE_VIDEO : type = "video" ; break;
265 case CODEC_TYPE_AUDIO : type = "audio" ; break;
266 case CODEC_TYPE_SUBTITLE: type = "text" ; break;
267 default : type = "application"; break;
270 av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);
271 sdp_write_address(buff, size, dest_addr, ttl);
273 av_strlcatf(buff, size, "b=AS:%d\r\n", c->bit_rate / 1000);
276 sdp_write_media_attributes(buff, size, c, payload_type);
279 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
281 AVMetadataTag *title = av_metadata_get(ac[0]->metadata, "title", NULL, 0);
282 struct sdp_session_level s;
286 memset(buff, 0, size);
287 memset(&s, 0, sizeof(struct sdp_session_level));
289 s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */
290 s.name = title ? title->value : "No Name";
295 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[0]->filename);
301 sdp_write_header(buff, size, &s);
304 for (i = 0; i < n_files; i++) {
306 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[i]->filename);
308 for (j = 0; j < ac[i]->nb_streams; j++) {
309 sdp_write_media(buff, size,
310 ac[i]->streams[j]->codec, dst[0] ? dst : NULL,
311 (port > 0) ? port + j * 2 : 0, ttl);
313 av_strlcatf(buff, size,
314 "a=control:streamid=%d\r\n", i + j);
322 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
324 return AVERROR(ENOSYS);