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 *src_type; /**< address type of src_addr */
48 const char *dst_addr; /**< destination IP address (can be multicast) */
49 const char *dst_type; /**< destination IP address type */
50 const char *name; /**< session name (can be an empty string) */
53 static void sdp_write_address(char *buff, int size, const char *dest_addr,
54 const char *dest_type, int ttl)
59 if (ttl > 0 && !strcmp(dest_type, "IP4")) {
60 /* The TTL should only be specified for IPv4 multicast addresses,
62 av_strlcatf(buff, size, "c=IN %s %s/%d\r\n", dest_type, dest_addr, ttl);
64 av_strlcatf(buff, size, "c=IN %s %s\r\n", dest_type, dest_addr);
69 static void sdp_write_header(char *buff, int size, struct sdp_session_level *s)
71 av_strlcatf(buff, size, "v=%d\r\n"
72 "o=- %d %d IN %s %s\r\n"
75 s->id, s->version, s->src_type, s->src_addr,
77 sdp_write_address(buff, size, s->dst_addr, s->dst_type, s->ttl);
78 av_strlcatf(buff, size, "t=%d %d\r\n"
79 "a=tool:libavformat " AV_STRINGIFY(LIBAVFORMAT_VERSION) "\r\n",
80 s->start_time, s->end_time);
84 static int resolve_destination(char *dest_addr, int size, char *type,
87 struct addrinfo hints, *ai;
90 av_strlcpy(type, "IP4", type_size);
94 /* Resolve the destination, since it must be written
95 * as a numeric IP address in the SDP. */
97 memset(&hints, 0, sizeof(hints));
98 if (getaddrinfo(dest_addr, NULL, &hints, &ai))
100 getnameinfo(ai->ai_addr, ai->ai_addrlen, dest_addr, size,
101 NULL, 0, NI_NUMERICHOST);
102 if (ai->ai_family == AF_INET6)
103 av_strlcpy(type, "IP6", type_size);
104 is_multicast = ff_is_multicast_address(ai->ai_addr);
109 static int resolve_destination(char *dest_addr, int size, char *type,
116 static int sdp_get_address(char *dest_addr, int size, int *ttl, const char *url)
122 av_url_split(proto, sizeof(proto), NULL, 0, dest_addr, size, &port, NULL, 0, url);
126 if (strcmp(proto, "rtp")) {
127 /* The url isn't for the actual rtp sessions,
128 * don't parse out anything else than the destination.
133 p = strchr(url, '?');
137 if (find_info_tag(buff, sizeof(buff), "ttl", p)) {
138 *ttl = strtol(buff, NULL, 10);
147 #define MAX_PSET_SIZE 1024
148 static char *extradata2psets(AVCodecContext *c)
152 const char *pset_string = "; sprop-parameter-sets=";
154 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
155 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
159 if (c->extradata[0] == 1) {
162 AVBitStreamFilterContext *bsfc= av_bitstream_filter_init("h264_mp4toannexb");
165 av_log(c, AV_LOG_ERROR, "Cannot open the h264_mp4toannexb BSF!\n");
169 av_bitstream_filter_filter(bsfc, c, NULL, &dummy_p, &dummy_int, NULL, 0, 0);
170 av_bitstream_filter_close(bsfc);
173 psets = av_mallocz(MAX_PSET_SIZE);
175 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n");
178 memcpy(psets, pset_string, strlen(pset_string));
179 p = psets + strlen(pset_string);
180 r = ff_avc_find_startcode(c->extradata, c->extradata + c->extradata_size);
181 while (r < c->extradata + c->extradata_size) {
186 nal_type = *r & 0x1f;
187 r1 = ff_avc_find_startcode(r, c->extradata + c->extradata_size);
188 if (nal_type != 7 && nal_type != 8) { /* Only output SPS and PPS */
192 if (p != (psets + strlen(pset_string))) {
196 if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) {
197 av_log(c, AV_LOG_ERROR, "Cannot Base64-encode %td %td!\n", MAX_PSET_SIZE - (p - psets), r1 - r);
209 static char *extradata2config(AVCodecContext *c)
213 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
214 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
218 config = av_malloc(10 + c->extradata_size * 2);
219 if (config == NULL) {
220 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
223 memcpy(config, "; config=", 9);
224 ff_data_to_hex(config + 9, c->extradata, c->extradata_size, 0);
225 config[9 + c->extradata_size * 2] = 0;
230 static char *xiph_extradata2config(AVCodecContext *c)
232 char *config, *encoded_config;
233 uint8_t *header_start[3];
234 int headers_len, header_len[3], config_len;
235 int first_header_size;
237 switch (c->codec_id) {
238 case CODEC_ID_THEORA:
239 first_header_size = 42;
241 case CODEC_ID_VORBIS:
242 first_header_size = 30;
245 av_log(c, AV_LOG_ERROR, "Unsupported Xiph codec ID\n");
249 if (ff_split_xiph_headers(c->extradata, c->extradata_size,
250 first_header_size, header_start,
252 av_log(c, AV_LOG_ERROR, "Extradata corrupt.\n");
256 headers_len = header_len[0] + header_len[2];
257 config_len = 4 + // count
262 headers_len; // and the rest
264 config = av_malloc(config_len);
268 encoded_config = av_malloc(AV_BASE64_SIZE(config_len));
269 if (!encoded_config) {
274 config[0] = config[1] = config[2] = 0;
276 config[4] = (RTP_XIPH_IDENT >> 16) & 0xff;
277 config[5] = (RTP_XIPH_IDENT >> 8) & 0xff;
278 config[6] = (RTP_XIPH_IDENT ) & 0xff;
279 config[7] = (headers_len >> 8) & 0xff;
280 config[8] = headers_len & 0xff;
282 config[10] = header_len[0];
283 config[11] = 0; // size of comment header; nonexistent
284 memcpy(config + 12, header_start[0], header_len[0]);
285 memcpy(config + 12 + header_len[0], header_start[2], header_len[2]);
287 av_base64_encode(encoded_config, AV_BASE64_SIZE(config_len),
291 return encoded_config;
294 av_log(c, AV_LOG_ERROR,
295 "Not enough memory for configuration string\n");
299 static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type)
303 switch (c->codec_id) {
305 if (c->extradata_size) {
306 config = extradata2psets(c);
308 av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n"
309 "a=fmtp:%d packetization-mode=1%s\r\n",
311 payload_type, config ? config : "");
315 av_strlcatf(buff, size, "a=rtpmap:%d H263-2000/90000\r\n", payload_type);
318 if (c->extradata_size) {
319 config = extradata2config(c);
321 av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"
322 "a=fmtp:%d profile-level-id=1%s\r\n",
324 payload_type, config ? config : "");
327 if (c->extradata_size) {
328 config = extradata2config(c);
330 /* FIXME: maybe we can forge config information based on the
331 * codec parameters...
333 av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n");
336 if (config == NULL) {
339 av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n"
340 "a=fmtp:%d profile-level-id=1;"
341 "mode=AAC-hbr;sizelength=13;indexlength=3;"
342 "indexdeltalength=3%s\r\n",
343 payload_type, c->sample_rate, c->channels,
344 payload_type, config);
346 case CODEC_ID_PCM_S16BE:
347 if (payload_type >= RTP_PT_PRIVATE)
348 av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n",
350 c->sample_rate, c->channels);
352 case CODEC_ID_PCM_MULAW:
353 if (payload_type >= RTP_PT_PRIVATE)
354 av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n",
356 c->sample_rate, c->channels);
358 case CODEC_ID_PCM_ALAW:
359 if (payload_type >= RTP_PT_PRIVATE)
360 av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n",
362 c->sample_rate, c->channels);
364 case CODEC_ID_AMR_NB:
365 av_strlcatf(buff, size, "a=rtpmap:%d AMR/%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_AMR_WB:
371 av_strlcatf(buff, size, "a=rtpmap:%d AMR-WB/%d/%d\r\n"
372 "a=fmtp:%d octet-align=1\r\n",
373 payload_type, c->sample_rate, c->channels,
376 case CODEC_ID_VORBIS:
377 if (c->extradata_size)
378 config = xiph_extradata2config(c);
380 av_log(c, AV_LOG_ERROR, "Vorbis configuration info missing\n");
384 av_strlcatf(buff, size, "a=rtpmap:%d vorbis/%d/%d\r\n"
385 "a=fmtp:%d configuration=%s\r\n",
386 payload_type, c->sample_rate, c->channels,
387 payload_type, config);
389 case CODEC_ID_THEORA: {
391 if (c->extradata_size)
392 config = xiph_extradata2config(c);
394 av_log(c, AV_LOG_ERROR, "Theora configuation info missing\n");
398 switch (c->pix_fmt) {
399 case PIX_FMT_YUV420P:
400 pix_fmt = "YCbCr-4:2:0";
402 case PIX_FMT_YUV422P:
403 pix_fmt = "YCbCr-4:2:2";
405 case PIX_FMT_YUV444P:
406 pix_fmt = "YCbCr-4:4:4";
409 av_log(c, AV_LOG_ERROR, "Unsupported pixel format.\n");
413 av_strlcatf(buff, size, "a=rtpmap:%d theora/90000\r\n"
414 "a=fmtp:%d delivery-method=inline; "
415 "width=%d; height=%d; sampling=%s; "
416 "configuration=%s\r\n",
417 payload_type, payload_type,
418 c->width, c->height, pix_fmt, config);
422 av_strlcatf(buff, size, "a=rtpmap:%d VP8/90000\r\n",
425 case CODEC_ID_ADPCM_G722:
426 if (payload_type >= RTP_PT_PRIVATE)
427 av_strlcatf(buff, size, "a=rtpmap:%d G722/%d/%d\r\n",
432 /* Nothing special to do here... */
441 void ff_sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, const char *dest_type, int port, int ttl)
446 payload_type = ff_rtp_get_payload_type(c);
447 if (payload_type < 0) {
448 payload_type = RTP_PT_PRIVATE + (c->codec_type == AVMEDIA_TYPE_AUDIO);
451 switch (c->codec_type) {
452 case AVMEDIA_TYPE_VIDEO : type = "video" ; break;
453 case AVMEDIA_TYPE_AUDIO : type = "audio" ; break;
454 case AVMEDIA_TYPE_SUBTITLE: type = "text" ; break;
455 default : type = "application"; break;
458 av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);
459 sdp_write_address(buff, size, dest_addr, dest_type, ttl);
461 av_strlcatf(buff, size, "b=AS:%d\r\n", c->bit_rate / 1000);
464 sdp_write_media_attributes(buff, size, c, payload_type);
467 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
469 AVMetadataTag *title = av_metadata_get(ac[0]->metadata, "title", NULL, 0);
470 struct sdp_session_level s;
471 int i, j, port, ttl, is_multicast;
472 char dst[32], dst_type[5];
474 memset(buff, 0, size);
475 memset(&s, 0, sizeof(struct sdp_session_level));
477 s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */
479 s.name = title ? title->value : "No Name";
484 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[0]->filename);
485 is_multicast = resolve_destination(dst, sizeof(dst), dst_type,
491 s.dst_type = dst_type;
493 if (!strcmp(dst_type, "IP6")) {
499 sdp_write_header(buff, size, &s);
502 for (i = 0; i < n_files; i++) {
504 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[i]->filename);
505 is_multicast = resolve_destination(dst, sizeof(dst), dst_type,
510 for (j = 0; j < ac[i]->nb_streams; j++) {
511 ff_sdp_write_media(buff, size,
512 ac[i]->streams[j]->codec, dst[0] ? dst : NULL,
513 dst_type, (port > 0) ? port + j * 2 : 0, ttl);
515 av_strlcatf(buff, size,
516 "a=control:streamid=%d\r\n", i + j);
524 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
526 return AVERROR(ENOSYS);
529 void ff_sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, const char *dest_type, int port, int ttl)