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 "libavutil/dict.h"
25 #include "libavutil/parseutils.h"
26 #include "libavutil/opt.h"
27 #include "libavcodec/xiph.h"
28 #include "libavcodec/mpeg4audio.h"
38 #define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2)
40 struct sdp_session_level {
41 int sdp_version; /**< protocol version (currently 0) */
42 int id; /**< session ID */
43 int version; /**< session version */
44 int start_time; /**< session start time (NTP time, in seconds),
45 or 0 in case of permanent session */
46 int end_time; /**< session end time (NTP time, in seconds),
47 or 0 if the session is not bounded */
48 int ttl; /**< TTL, in case of multicast stream */
49 const char *user; /**< username of the session's creator */
50 const char *src_addr; /**< IP address of the machine from which the session was created */
51 const char *src_type; /**< address type of src_addr */
52 const char *dst_addr; /**< destination IP address (can be multicast) */
53 const char *dst_type; /**< destination IP address type */
54 const char *name; /**< session name (can be an empty string) */
57 static void sdp_write_address(char *buff, int size, const char *dest_addr,
58 const char *dest_type, int ttl)
63 if (ttl > 0 && !strcmp(dest_type, "IP4")) {
64 /* The TTL should only be specified for IPv4 multicast addresses,
66 av_strlcatf(buff, size, "c=IN %s %s/%d\r\n", dest_type, dest_addr, ttl);
68 av_strlcatf(buff, size, "c=IN %s %s\r\n", dest_type, dest_addr);
73 static void sdp_write_header(char *buff, int size, struct sdp_session_level *s)
75 av_strlcatf(buff, size, "v=%d\r\n"
76 "o=- %d %d IN %s %s\r\n"
79 s->id, s->version, s->src_type, s->src_addr,
81 sdp_write_address(buff, size, s->dst_addr, s->dst_type, s->ttl);
82 av_strlcatf(buff, size, "t=%d %d\r\n"
83 "a=tool:libavformat " AV_STRINGIFY(LIBAVFORMAT_VERSION) "\r\n",
84 s->start_time, s->end_time);
88 static int resolve_destination(char *dest_addr, int size, char *type,
91 struct addrinfo hints = { 0 }, *ai;
94 av_strlcpy(type, "IP4", type_size);
98 /* Resolve the destination, since it must be written
99 * as a numeric IP address in the SDP. */
101 if (getaddrinfo(dest_addr, NULL, &hints, &ai))
103 getnameinfo(ai->ai_addr, ai->ai_addrlen, dest_addr, size,
104 NULL, 0, NI_NUMERICHOST);
106 if (ai->ai_family == AF_INET6)
107 av_strlcpy(type, "IP6", type_size);
109 is_multicast = ff_is_multicast_address(ai->ai_addr);
114 static int resolve_destination(char *dest_addr, int size, char *type,
121 static int sdp_get_address(char *dest_addr, int size, int *ttl, const char *url)
127 av_url_split(proto, sizeof(proto), NULL, 0, dest_addr, size, &port, NULL, 0, url);
131 if (strcmp(proto, "rtp") && strcmp(proto, "srtp")) {
132 /* The url isn't for the actual rtp sessions,
133 * don't parse out anything else than the destination.
138 p = strchr(url, '?');
142 if (av_find_info_tag(buff, sizeof(buff), "ttl", p)) {
143 *ttl = strtol(buff, NULL, 10);
152 #define MAX_PSET_SIZE 1024
153 static char *extradata2psets(AVCodecContext *c)
157 static const char pset_string[] = "; sprop-parameter-sets=";
158 static const char profile_string[] = "; profile-level-id=";
159 uint8_t *extradata = c->extradata;
160 int extradata_size = c->extradata_size;
161 uint8_t *tmpbuf = NULL;
162 const uint8_t *sps = NULL, *sps_end;
164 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
165 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
169 if (c->extradata[0] == 1) {
170 if (ff_avc_write_annexb_extradata(c->extradata, &extradata,
176 psets = av_mallocz(MAX_PSET_SIZE);
178 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n");
182 memcpy(psets, pset_string, strlen(pset_string));
183 p = psets + strlen(pset_string);
184 r = ff_avc_find_startcode(extradata, extradata + extradata_size);
185 while (r < extradata + extradata_size) {
190 nal_type = *r & 0x1f;
191 r1 = ff_avc_find_startcode(r, extradata + extradata_size);
192 if (nal_type != 7 && nal_type != 8) { /* Only output SPS and PPS */
196 if (p != (psets + strlen(pset_string))) {
204 if (!av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r)) {
205 av_log(c, AV_LOG_ERROR, "Cannot Base64-encode %"PTRDIFF_SPECIFIER" %"PTRDIFF_SPECIFIER"!\n", MAX_PSET_SIZE - (p - psets), r1 - r);
214 if (sps && sps_end - sps >= 4) {
215 memcpy(p, profile_string, strlen(profile_string));
217 ff_data_to_hex(p, sps + 1, 3, 0);
225 static char *extradata2config(AVCodecContext *c)
229 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
230 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
234 config = av_malloc(10 + c->extradata_size * 2);
236 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
239 memcpy(config, "; config=", 9);
240 ff_data_to_hex(config + 9, c->extradata, c->extradata_size, 0);
241 config[9 + c->extradata_size * 2] = 0;
246 static char *xiph_extradata2config(AVCodecContext *c)
248 char *config, *encoded_config;
249 uint8_t *header_start[3];
250 int headers_len, header_len[3], config_len;
251 int first_header_size;
253 switch (c->codec_id) {
254 case AV_CODEC_ID_THEORA:
255 first_header_size = 42;
257 case AV_CODEC_ID_VORBIS:
258 first_header_size = 30;
261 av_log(c, AV_LOG_ERROR, "Unsupported Xiph codec ID\n");
265 if (avpriv_split_xiph_headers(c->extradata, c->extradata_size,
266 first_header_size, header_start,
268 av_log(c, AV_LOG_ERROR, "Extradata corrupt.\n");
272 headers_len = header_len[0] + header_len[2];
273 config_len = 4 + // count
278 headers_len; // and the rest
280 config = av_malloc(config_len);
284 encoded_config = av_malloc(AV_BASE64_SIZE(config_len));
285 if (!encoded_config) {
290 config[0] = config[1] = config[2] = 0;
292 config[4] = (RTP_XIPH_IDENT >> 16) & 0xff;
293 config[5] = (RTP_XIPH_IDENT >> 8) & 0xff;
294 config[6] = (RTP_XIPH_IDENT ) & 0xff;
295 config[7] = (headers_len >> 8) & 0xff;
296 config[8] = headers_len & 0xff;
298 config[10] = header_len[0];
299 config[11] = 0; // size of comment header; nonexistent
300 memcpy(config + 12, header_start[0], header_len[0]);
301 memcpy(config + 12 + header_len[0], header_start[2], header_len[2]);
303 av_base64_encode(encoded_config, AV_BASE64_SIZE(config_len),
307 return encoded_config;
310 av_log(c, AV_LOG_ERROR,
311 "Not enough memory for configuration string\n");
315 static int latm_context2profilelevel(AVCodecContext *c)
318 * The RTP payload format specification is described in RFC 3016
319 * The encoding specifications are provided in ISO/IEC 14496-3 */
321 int profile_level = 0x2B;
323 /* TODO: AAC Profile only supports AAC LC Object Type.
324 * Different Object Types should implement different Profile Levels */
326 if (c->sample_rate <= 24000) {
327 if (c->channels <= 2)
328 profile_level = 0x28; // AAC Profile, Level 1
329 } else if (c->sample_rate <= 48000) {
330 if (c->channels <= 2) {
331 profile_level = 0x29; // AAC Profile, Level 2
332 } else if (c->channels <= 5) {
333 profile_level = 0x2A; // AAC Profile, Level 4
335 } else if (c->sample_rate <= 96000) {
336 if (c->channels <= 5) {
337 profile_level = 0x2B; // AAC Profile, Level 5
341 return profile_level;
344 static char *latm_context2config(AVCodecContext *c)
347 * The RTP payload format specification is described in RFC 3016
348 * The encoding specifications are provided in ISO/IEC 14496-3 */
350 uint8_t config_byte[6];
354 for (rate_index = 0; rate_index < 16; rate_index++)
355 if (avpriv_mpeg4audio_sample_rates[rate_index] == c->sample_rate)
357 if (rate_index == 16) {
358 av_log(c, AV_LOG_ERROR, "Unsupported sample rate\n");
362 config_byte[0] = 0x40;
364 config_byte[2] = 0x20 | rate_index;
365 config_byte[3] = c->channels << 4;
366 config_byte[4] = 0x3f;
367 config_byte[5] = 0xc0;
369 config = av_malloc(6*2+1);
371 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
374 ff_data_to_hex(config, config_byte, 6, 1);
380 static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type, AVFormatContext *fmt)
384 switch (c->codec_id) {
385 case AV_CODEC_ID_H264: {
387 if (fmt && fmt->oformat && fmt->oformat->priv_class &&
388 av_opt_flag_is_set(fmt->priv_data, "rtpflags", "h264_mode0"))
390 if (c->extradata_size) {
391 config = extradata2psets(c);
393 av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n"
394 "a=fmtp:%d packetization-mode=%d%s\r\n",
396 payload_type, mode, config ? config : "");
399 case AV_CODEC_ID_H261:
401 const char *pic_fmt = NULL;
402 /* only QCIF and CIF are specified as supported in RFC 4587 */
403 if (c->width == 176 && c->height == 144)
405 if (c->width == 352 && c->height == 288)
407 av_strlcatf(buff, size, "a=rtpmap:%d H261/90000\r\n", payload_type);
409 av_strlcatf(buff, size, "a=fmtp:%d %s\r\n", payload_type, pic_fmt);
412 case AV_CODEC_ID_H263:
413 case AV_CODEC_ID_H263P:
414 /* a=framesize is required by 3GPP TS 26.234 (PSS). It
415 * actually specifies the maximum video size, but we only know
416 * the current size. This is required for playback on Android
417 * stagefright and on Samsung bada. */
418 if (!fmt || !fmt->oformat->priv_class ||
419 !av_opt_flag_is_set(fmt->priv_data, "rtpflags", "rfc2190") ||
420 c->codec_id == AV_CODEC_ID_H263P)
421 av_strlcatf(buff, size, "a=rtpmap:%d H263-2000/90000\r\n"
422 "a=framesize:%d %d-%d\r\n",
424 payload_type, c->width, c->height);
426 case AV_CODEC_ID_HEVC:
427 if (c->extradata_size)
428 av_log(NULL, AV_LOG_WARNING, "HEVC extradata not currently "
429 "passed properly through SDP\n");
430 av_strlcatf(buff, size, "a=rtpmap:%d H265/90000\r\n", payload_type);
432 case AV_CODEC_ID_MPEG4:
433 if (c->extradata_size) {
434 config = extradata2config(c);
436 av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"
437 "a=fmtp:%d profile-level-id=1%s\r\n",
439 payload_type, config ? config : "");
441 case AV_CODEC_ID_AAC:
442 if (fmt && fmt->oformat && fmt->oformat->priv_class &&
443 av_opt_flag_is_set(fmt->priv_data, "rtpflags", "latm")) {
444 config = latm_context2config(c);
447 av_strlcatf(buff, size, "a=rtpmap:%d MP4A-LATM/%d/%d\r\n"
448 "a=fmtp:%d profile-level-id=%d;cpresent=0;config=%s\r\n",
449 payload_type, c->sample_rate, c->channels,
450 payload_type, latm_context2profilelevel(c), config);
452 if (c->extradata_size) {
453 config = extradata2config(c);
455 /* FIXME: maybe we can forge config information based on the
456 * codec parameters...
458 av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n");
464 av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n"
465 "a=fmtp:%d profile-level-id=1;"
466 "mode=AAC-hbr;sizelength=13;indexlength=3;"
467 "indexdeltalength=3%s\r\n",
468 payload_type, c->sample_rate, c->channels,
469 payload_type, config);
472 case AV_CODEC_ID_PCM_S16BE:
473 if (payload_type >= RTP_PT_PRIVATE)
474 av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n",
476 c->sample_rate, c->channels);
478 case AV_CODEC_ID_PCM_MULAW:
479 if (payload_type >= RTP_PT_PRIVATE)
480 av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n",
482 c->sample_rate, c->channels);
484 case AV_CODEC_ID_PCM_ALAW:
485 if (payload_type >= RTP_PT_PRIVATE)
486 av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n",
488 c->sample_rate, c->channels);
490 case AV_CODEC_ID_AMR_NB:
491 av_strlcatf(buff, size, "a=rtpmap:%d AMR/%d/%d\r\n"
492 "a=fmtp:%d octet-align=1\r\n",
493 payload_type, c->sample_rate, c->channels,
496 case AV_CODEC_ID_AMR_WB:
497 av_strlcatf(buff, size, "a=rtpmap:%d AMR-WB/%d/%d\r\n"
498 "a=fmtp:%d octet-align=1\r\n",
499 payload_type, c->sample_rate, c->channels,
502 case AV_CODEC_ID_VORBIS:
503 if (c->extradata_size)
504 config = xiph_extradata2config(c);
506 av_log(c, AV_LOG_ERROR, "Vorbis configuration info missing\n");
510 av_strlcatf(buff, size, "a=rtpmap:%d vorbis/%d/%d\r\n"
511 "a=fmtp:%d configuration=%s\r\n",
512 payload_type, c->sample_rate, c->channels,
513 payload_type, config);
515 case AV_CODEC_ID_THEORA: {
517 switch (c->pix_fmt) {
518 case AV_PIX_FMT_YUV420P:
519 pix_fmt = "YCbCr-4:2:0";
521 case AV_PIX_FMT_YUV422P:
522 pix_fmt = "YCbCr-4:2:2";
524 case AV_PIX_FMT_YUV444P:
525 pix_fmt = "YCbCr-4:4:4";
528 av_log(c, AV_LOG_ERROR, "Unsupported pixel format.\n");
532 if (c->extradata_size)
533 config = xiph_extradata2config(c);
535 av_log(c, AV_LOG_ERROR, "Theora configuation info missing\n");
539 av_strlcatf(buff, size, "a=rtpmap:%d theora/90000\r\n"
540 "a=fmtp:%d delivery-method=inline; "
541 "width=%d; height=%d; sampling=%s; "
542 "configuration=%s\r\n",
543 payload_type, payload_type,
544 c->width, c->height, pix_fmt, config);
547 case AV_CODEC_ID_VP8:
548 av_strlcatf(buff, size, "a=rtpmap:%d VP8/90000\r\n",
551 case AV_CODEC_ID_MJPEG:
552 if (payload_type >= RTP_PT_PRIVATE)
553 av_strlcatf(buff, size, "a=rtpmap:%d JPEG/90000\r\n",
556 case AV_CODEC_ID_ADPCM_G722:
557 if (payload_type >= RTP_PT_PRIVATE)
558 av_strlcatf(buff, size, "a=rtpmap:%d G722/%d/%d\r\n",
562 case AV_CODEC_ID_ADPCM_G726: {
563 if (payload_type >= RTP_PT_PRIVATE)
564 av_strlcatf(buff, size, "a=rtpmap:%d G726-%d/%d\r\n",
566 c->bits_per_coded_sample*8,
570 case AV_CODEC_ID_ILBC:
571 av_strlcatf(buff, size, "a=rtpmap:%d iLBC/%d\r\n"
572 "a=fmtp:%d mode=%d\r\n",
573 payload_type, c->sample_rate,
574 payload_type, c->block_align == 38 ? 20 : 30);
576 case AV_CODEC_ID_SPEEX:
577 av_strlcatf(buff, size, "a=rtpmap:%d speex/%d\r\n",
578 payload_type, c->sample_rate);
583 if (c->flags & CODEC_FLAG_QSCALE)
585 else if (!av_opt_get_int(c, "vad", AV_OPT_FLAG_ENCODING_PARAM, &vad_option) && vad_option)
590 av_strlcatf(buff, size, "a=fmtp:%d vbr=%s\r\n",
594 case AV_CODEC_ID_OPUS:
595 /* The opus RTP draft says that all opus streams MUST be declared
596 as stereo, to avoid negotiation failures. The actual number of
597 channels can change on a packet-by-packet basis. The number of
598 channels a receiver prefers to receive or a sender plans to send
599 can be declared via fmtp parameters (both default to mono), but
600 receivers MUST be able to receive and process stereo packets. */
601 av_strlcatf(buff, size, "a=rtpmap:%d opus/48000/2\r\n",
603 if (c->channels == 2) {
604 av_strlcatf(buff, size, "a=fmtp:%d sprop-stereo:1\r\n",
609 /* Nothing special to do here... */
618 void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx,
619 const char *dest_addr, const char *dest_type,
620 int port, int ttl, AVFormatContext *fmt)
622 AVCodecContext *c = st->codec;
626 payload_type = ff_rtp_get_payload_type(fmt, c, idx);
628 switch (c->codec_type) {
629 case AVMEDIA_TYPE_VIDEO : type = "video" ; break;
630 case AVMEDIA_TYPE_AUDIO : type = "audio" ; break;
631 case AVMEDIA_TYPE_SUBTITLE: type = "text" ; break;
632 default : type = "application"; break;
635 av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);
636 sdp_write_address(buff, size, dest_addr, dest_type, ttl);
638 av_strlcatf(buff, size, "b=AS:%d\r\n", c->bit_rate / 1000);
641 sdp_write_media_attributes(buff, size, c, payload_type, fmt);
644 int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
646 AVDictionaryEntry *title = av_dict_get(ac[0]->metadata, "title", NULL, 0);
647 struct sdp_session_level s = { 0 };
648 int i, j, port, ttl, is_multicast, index = 0;
649 char dst[32], dst_type[5];
651 memset(buf, 0, size);
653 s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */
655 s.name = title ? title->value : "No Name";
660 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[0]->filename);
661 is_multicast = resolve_destination(dst, sizeof(dst), dst_type,
667 s.dst_type = dst_type;
669 if (!strcmp(dst_type, "IP6")) {
675 sdp_write_header(buf, size, &s);
678 for (i = 0; i < n_files; i++) {
680 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[i]->filename);
681 is_multicast = resolve_destination(dst, sizeof(dst), dst_type,
686 for (j = 0; j < ac[i]->nb_streams; j++) {
687 ff_sdp_write_media(buf, size, ac[i]->streams[j], index++,
688 dst[0] ? dst : NULL, dst_type,
689 (port > 0) ? port + j * 2 : 0,
692 av_strlcatf(buf, size,
693 "a=control:streamid=%d\r\n", i + j);
695 if (ac[i]->pb && ac[i]->pb->av_class) {
696 uint8_t *crypto_suite = NULL, *crypto_params = NULL;
697 av_opt_get(ac[i]->pb, "srtp_out_suite", AV_OPT_SEARCH_CHILDREN,
699 av_opt_get(ac[i]->pb, "srtp_out_params", AV_OPT_SEARCH_CHILDREN,
701 if (crypto_suite && crypto_suite[0])
702 av_strlcatf(buf, size,
703 "a=crypto:1 %s inline:%s\r\n",
704 crypto_suite, crypto_params);
705 av_free(crypto_suite);
706 av_free(crypto_params);
714 int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
716 return AVERROR(ENOSYS);
719 void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx,
720 const char *dest_addr, const char *dest_type,
721 int port, int ttl, AVFormatContext *fmt)