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"
24 #include "libavcodec/xiph.h"
34 #define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2)
36 struct sdp_session_level {
37 int sdp_version; /**< protocol version (currently 0) */
38 int id; /**< session ID */
39 int version; /**< session version */
40 int start_time; /**< session start time (NTP time, in seconds),
41 or 0 in case of permanent session */
42 int end_time; /**< session end time (NTP time, in seconds),
43 or 0 if the session is not bounded */
44 int ttl; /**< TTL, in case of multicast stream */
45 const char *user; /**< username of the session's creator */
46 const char *src_addr; /**< IP address of the machine from which the session was created */
47 const char *dst_addr; /**< destination IP address (can be multicast) */
48 const char *name; /**< session name (can be an empty string) */
51 static void sdp_write_address(char *buff, int size, const char *dest_addr, int ttl)
55 av_strlcatf(buff, size, "c=IN IP4 %s/%d\r\n", dest_addr, ttl);
57 av_strlcatf(buff, size, "c=IN IP4 %s\r\n", dest_addr);
62 static void sdp_write_header(char *buff, int size, struct sdp_session_level *s)
64 av_strlcatf(buff, size, "v=%d\r\n"
65 "o=- %d %d IN IP4 %s\r\n"
68 s->id, s->version, s->src_addr,
70 sdp_write_address(buff, size, s->dst_addr, s->ttl);
71 av_strlcatf(buff, size, "t=%d %d\r\n"
72 "a=tool:libavformat " AV_STRINGIFY(LIBAVFORMAT_VERSION) "\r\n",
73 s->start_time, s->end_time);
77 static void resolve_destination(char *dest_addr, int size)
79 struct addrinfo hints, *ai, *cur;
84 /* Resolve the destination, since it must be written
85 * as a numeric IP address in the SDP. */
87 memset(&hints, 0, sizeof(hints));
88 /* We only support IPv4 addresses in the SDP at the moment. */
89 hints.ai_family = AF_INET;
90 if (getaddrinfo(dest_addr, NULL, &hints, &ai))
92 for (cur = ai; cur; cur = cur->ai_next) {
93 if (cur->ai_family == AF_INET) {
94 getnameinfo(cur->ai_addr, cur->ai_addrlen, dest_addr, size,
95 NULL, 0, NI_NUMERICHOST);
102 static void resolve_destination(char *dest_addr, int size)
107 static int sdp_get_address(char *dest_addr, int size, int *ttl, const char *url)
113 av_url_split(proto, sizeof(proto), NULL, 0, dest_addr, size, &port, NULL, 0, url);
117 if (strcmp(proto, "rtp")) {
118 /* The url isn't for the actual rtp sessions,
119 * don't parse out anything else than the destination.
124 p = strchr(url, '?');
127 int is_multicast = find_info_tag(buff, sizeof(buff), "multicast", p);
130 if (find_info_tag(buff, sizeof(buff), "ttl", p)) {
131 *ttl = strtol(buff, NULL, 10);
141 #define MAX_PSET_SIZE 1024
142 static char *extradata2psets(AVCodecContext *c)
146 const char *pset_string = "; sprop-parameter-sets=";
148 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
149 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
153 if (c->extradata[0] == 1) {
156 AVBitStreamFilterContext *bsfc= av_bitstream_filter_init("h264_mp4toannexb");
159 av_log(c, AV_LOG_ERROR, "Cannot open the h264_mp4toannexb BSF!\n");
163 av_bitstream_filter_filter(bsfc, c, NULL, &dummy_p, &dummy_int, NULL, 0, 0);
164 av_bitstream_filter_close(bsfc);
167 psets = av_mallocz(MAX_PSET_SIZE);
169 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n");
172 memcpy(psets, pset_string, strlen(pset_string));
173 p = psets + strlen(pset_string);
174 r = ff_avc_find_startcode(c->extradata, c->extradata + c->extradata_size);
175 while (r < c->extradata + c->extradata_size) {
180 nal_type = *r & 0x1f;
181 r1 = ff_avc_find_startcode(r, c->extradata + c->extradata_size);
182 if (nal_type != 7 && nal_type != 8) { /* Only output SPS and PPS */
186 if (p != (psets + strlen(pset_string))) {
190 if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) {
191 av_log(c, AV_LOG_ERROR, "Cannot Base64-encode %td %td!\n", MAX_PSET_SIZE - (p - psets), r1 - r);
203 static char *extradata2config(AVCodecContext *c)
207 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
208 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
212 config = av_malloc(10 + c->extradata_size * 2);
213 if (config == NULL) {
214 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
217 memcpy(config, "; config=", 9);
218 ff_data_to_hex(config + 9, c->extradata, c->extradata_size, 0);
219 config[9 + c->extradata_size * 2] = 0;
224 static char *xiph_extradata2config(AVCodecContext *c)
226 char *config, *encoded_config;
227 uint8_t *header_start[3];
228 int headers_len, header_len[3], config_len;
229 int first_header_size;
231 switch (c->codec_id) {
232 case CODEC_ID_THEORA:
233 first_header_size = 42;
235 case CODEC_ID_VORBIS:
236 first_header_size = 30;
239 av_log(c, AV_LOG_ERROR, "Unsupported Xiph codec ID\n");
243 if (ff_split_xiph_headers(c->extradata, c->extradata_size,
244 first_header_size, header_start,
246 av_log(c, AV_LOG_ERROR, "Extradata corrupt.\n");
250 headers_len = header_len[0] + header_len[2];
251 config_len = 4 + // count
256 headers_len; // and the rest
258 config = av_malloc(config_len);
262 encoded_config = av_malloc(AV_BASE64_SIZE(config_len));
263 if (!encoded_config) {
268 config[0] = config[1] = config[2] = 0;
270 config[4] = (RTP_XIPH_IDENT >> 16) & 0xff;
271 config[5] = (RTP_XIPH_IDENT >> 8) & 0xff;
272 config[6] = (RTP_XIPH_IDENT ) & 0xff;
273 config[7] = (headers_len >> 8) & 0xff;
274 config[8] = headers_len & 0xff;
276 config[10] = header_len[0];
277 config[11] = 0; // size of comment header; nonexistent
278 memcpy(config + 12, header_start[0], header_len[0]);
279 memcpy(config + 12 + header_len[0], header_start[2], header_len[2]);
281 av_base64_encode(encoded_config, AV_BASE64_SIZE(config_len),
285 return encoded_config;
288 av_log(c, AV_LOG_ERROR,
289 "Not enough memory for configuration string\n");
293 static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type)
297 switch (c->codec_id) {
299 if (c->extradata_size) {
300 config = extradata2psets(c);
302 av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n"
303 "a=fmtp:%d packetization-mode=1%s\r\n",
305 payload_type, config ? config : "");
309 av_strlcatf(buff, size, "a=rtpmap:%d H263-2000/90000\r\n", payload_type);
312 if (c->extradata_size) {
313 config = extradata2config(c);
315 av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"
316 "a=fmtp:%d profile-level-id=1%s\r\n",
318 payload_type, config ? config : "");
321 if (c->extradata_size) {
322 config = extradata2config(c);
324 /* FIXME: maybe we can forge config information based on the
325 * codec parameters...
327 av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n");
330 if (config == NULL) {
333 av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n"
334 "a=fmtp:%d profile-level-id=1;"
335 "mode=AAC-hbr;sizelength=13;indexlength=3;"
336 "indexdeltalength=3%s\r\n",
337 payload_type, c->sample_rate, c->channels,
338 payload_type, config);
340 case CODEC_ID_PCM_S16BE:
341 if (payload_type >= RTP_PT_PRIVATE)
342 av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n",
344 c->sample_rate, c->channels);
346 case CODEC_ID_PCM_MULAW:
347 if (payload_type >= RTP_PT_PRIVATE)
348 av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n",
350 c->sample_rate, c->channels);
352 case CODEC_ID_PCM_ALAW:
353 if (payload_type >= RTP_PT_PRIVATE)
354 av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n",
356 c->sample_rate, c->channels);
358 case CODEC_ID_AMR_NB:
359 av_strlcatf(buff, size, "a=rtpmap:%d AMR/%d/%d\r\n"
360 "a=fmtp:%d octet-align=1\r\n",
361 payload_type, c->sample_rate, c->channels,
364 case CODEC_ID_AMR_WB:
365 av_strlcatf(buff, size, "a=rtpmap:%d AMR-WB/%d/%d\r\n"
366 "a=fmtp:%d octet-align=1\r\n",
367 payload_type, c->sample_rate, c->channels,
370 case CODEC_ID_VORBIS:
371 if (c->extradata_size)
372 config = xiph_extradata2config(c);
374 av_log(c, AV_LOG_ERROR, "Vorbis configuration info missing\n");
378 av_strlcatf(buff, size, "a=rtpmap:%d vorbis/%d/%d\r\n"
379 "a=fmtp:%d configuration=%s\r\n",
380 payload_type, c->sample_rate, c->channels,
381 payload_type, config);
383 case CODEC_ID_THEORA: {
385 if (c->extradata_size)
386 config = xiph_extradata2config(c);
388 av_log(c, AV_LOG_ERROR, "Theora configuation info missing\n");
392 switch (c->pix_fmt) {
393 case PIX_FMT_YUV420P:
394 pix_fmt = "YCbCr-4:2:0";
396 case PIX_FMT_YUV422P:
397 pix_fmt = "YCbCr-4:2:2";
399 case PIX_FMT_YUV444P:
400 pix_fmt = "YCbCr-4:4:4";
403 av_log(c, AV_LOG_ERROR, "Unsupported pixel format.\n");
407 av_strlcatf(buff, size, "a=rtpmap:%d theora/90000\r\n"
408 "a=fmtp:%d delivery-method=inline; "
409 "width=%d; height=%d; sampling=%s; "
410 "configuration=%s\r\n",
411 payload_type, payload_type,
412 c->width, c->height, pix_fmt, config);
416 av_strlcatf(buff, size, "a=rtpmap:%d VP8/90000\r\n",
420 /* Nothing special to do here... */
429 void ff_sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, int port, int ttl)
434 payload_type = ff_rtp_get_payload_type(c);
435 if (payload_type < 0) {
436 payload_type = RTP_PT_PRIVATE + (c->codec_type == AVMEDIA_TYPE_AUDIO);
439 switch (c->codec_type) {
440 case AVMEDIA_TYPE_VIDEO : type = "video" ; break;
441 case AVMEDIA_TYPE_AUDIO : type = "audio" ; break;
442 case AVMEDIA_TYPE_SUBTITLE: type = "text" ; break;
443 default : type = "application"; break;
446 av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);
447 sdp_write_address(buff, size, dest_addr, ttl);
449 av_strlcatf(buff, size, "b=AS:%d\r\n", c->bit_rate / 1000);
452 sdp_write_media_attributes(buff, size, c, payload_type);
455 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
457 AVMetadataTag *title = av_metadata_get(ac[0]->metadata, "title", NULL, 0);
458 struct sdp_session_level s;
462 memset(buff, 0, size);
463 memset(&s, 0, sizeof(struct sdp_session_level));
465 s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */
466 s.name = title ? title->value : "No Name";
471 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[0]->filename);
472 resolve_destination(dst, sizeof(dst));
478 sdp_write_header(buff, size, &s);
481 for (i = 0; i < n_files; i++) {
483 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[i]->filename);
484 resolve_destination(dst, sizeof(dst));
486 for (j = 0; j < ac[i]->nb_streams; j++) {
487 ff_sdp_write_media(buff, size,
488 ac[i]->streams[j]->codec, dst[0] ? dst : NULL,
489 (port > 0) ? port + j * 2 : 0, ttl);
491 av_strlcatf(buff, size,
492 "a=control:streamid=%d\r\n", i + j);
500 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
502 return AVERROR(ENOSYS);
505 void ff_sdp_write_media(char *buff, int size, AVCodecContext *c,
506 const char *dest_addr, int port, int ttl)