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"
39 #define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2)
41 struct sdp_session_level
{
42 int sdp_version
; /**< protocol version (currently 0) */
43 int id
; /**< session ID */
44 int version
; /**< session version */
45 int start_time
; /**< session start time (NTP time, in seconds),
46 or 0 in case of permanent session */
47 int end_time
; /**< session end time (NTP time, in seconds),
48 or 0 if the session is not bounded */
49 int ttl
; /**< TTL, in case of multicast stream */
50 const char *user
; /**< username of the session's creator */
51 const char *src_addr
; /**< IP address of the machine from which the session was created */
52 const char *src_type
; /**< address type of src_addr */
53 const char *dst_addr
; /**< destination IP address (can be multicast) */
54 const char *dst_type
; /**< destination IP address type */
55 const char *name
; /**< session name (can be an empty string) */
58 static void sdp_write_address(char *buff
, int size
, const char *dest_addr
,
59 const char *dest_type
, int ttl
)
64 if (ttl
> 0 && !strcmp(dest_type
, "IP4")) {
65 /* The TTL should only be specified for IPv4 multicast addresses,
67 av_strlcatf(buff
, size
, "c=IN %s %s/%d\r\n", dest_type
, dest_addr
, ttl
);
69 av_strlcatf(buff
, size
, "c=IN %s %s\r\n", dest_type
, dest_addr
);
74 static void sdp_write_header(char *buff
, int size
, struct sdp_session_level
*s
)
76 av_strlcatf(buff
, size
, "v=%d\r\n"
77 "o=- %d %d IN %s %s\r\n"
80 s
->id
, s
->version
, s
->src_type
, s
->src_addr
,
82 sdp_write_address(buff
, size
, s
->dst_addr
, s
->dst_type
, s
->ttl
);
83 av_strlcatf(buff
, size
, "t=%d %d\r\n"
84 "a=tool:libavformat " AV_STRINGIFY(LIBAVFORMAT_VERSION
) "\r\n",
85 s
->start_time
, s
->end_time
);
89 static int resolve_destination(char *dest_addr
, int size
, char *type
,
92 struct addrinfo hints
= { 0 }, *ai
;
95 av_strlcpy(type
, "IP4", type_size
);
99 /* Resolve the destination, since it must be written
100 * as a numeric IP address in the SDP. */
102 if (getaddrinfo(dest_addr
, NULL
, &hints
, &ai
))
104 getnameinfo(ai
->ai_addr
, ai
->ai_addrlen
, dest_addr
, size
,
105 NULL
, 0, NI_NUMERICHOST
);
107 if (ai
->ai_family
== AF_INET6
)
108 av_strlcpy(type
, "IP6", type_size
);
110 is_multicast
= ff_is_multicast_address(ai
->ai_addr
);
115 static int resolve_destination(char *dest_addr
, int size
, char *type
,
122 static int sdp_get_address(char *dest_addr
, int size
, int *ttl
, const char *url
)
128 av_url_split(proto
, sizeof(proto
), NULL
, 0, dest_addr
, size
, &port
, NULL
, 0, url
);
132 if (strcmp(proto
, "rtp") && strcmp(proto
, "srtp")) {
133 /* The url isn't for the actual rtp sessions,
134 * don't parse out anything else than the destination.
139 p
= strchr(url
, '?');
143 if (av_find_info_tag(buff
, sizeof(buff
), "ttl", p
)) {
144 *ttl
= strtol(buff
, NULL
, 10);
153 #define MAX_PSET_SIZE 1024
154 static char *extradata2psets(AVCodecContext
*c
)
158 static const char pset_string
[] = "; sprop-parameter-sets=";
159 static const char profile_string
[] = "; profile-level-id=";
160 uint8_t *extradata
= c
->extradata
;
161 int extradata_size
= c
->extradata_size
;
162 uint8_t *tmpbuf
= NULL
;
163 const uint8_t *sps
= NULL
, *sps_end
;
165 if (c
->extradata_size
> MAX_EXTRADATA_SIZE
) {
166 av_log(c
, AV_LOG_ERROR
, "Too much extradata!\n");
170 if (c
->extradata
[0] == 1) {
171 if (ff_avc_write_annexb_extradata(c
->extradata
, &extradata
,
177 psets
= av_mallocz(MAX_PSET_SIZE
);
179 av_log(c
, AV_LOG_ERROR
, "Cannot allocate memory for the parameter sets.\n");
183 memcpy(psets
, pset_string
, strlen(pset_string
));
184 p
= psets
+ strlen(pset_string
);
185 r
= ff_avc_find_startcode(extradata
, extradata
+ extradata_size
);
186 while (r
< extradata
+ extradata_size
) {
191 nal_type
= *r
& 0x1f;
192 r1
= ff_avc_find_startcode(r
, extradata
+ extradata_size
);
193 if (nal_type
!= 7 && nal_type
!= 8) { /* Only output SPS and PPS */
197 if (p
!= (psets
+ strlen(pset_string
))) {
205 if (!av_base64_encode(p
, MAX_PSET_SIZE
- (p
- psets
), r
, r1
- r
)) {
206 av_log(c
, AV_LOG_ERROR
, "Cannot Base64-encode %"PTRDIFF_SPECIFIER
" %"PTRDIFF_SPECIFIER
"!\n", MAX_PSET_SIZE
- (p
- psets
), r1
- r
);
215 if (sps
&& sps_end
- sps
>= 4) {
216 memcpy(p
, profile_string
, strlen(profile_string
));
218 ff_data_to_hex(p
, sps
+ 1, 3, 0);
226 static char *extradata2psets_hevc(AVCodecContext
*c
)
229 uint8_t *extradata
= c
->extradata
;
230 int extradata_size
= c
->extradata_size
;
231 uint8_t *tmpbuf
= NULL
;
232 int ps_pos
[3] = { 0 };
233 static const char * const ps_names
[3] = { "vps", "sps", "pps" };
234 int num_arrays
, num_nalus
;
237 // Convert to hvcc format. Since we need to group multiple NALUs of
238 // the same type, and we might need to convert from one format to the
239 // other anyway, we get away with a little less work by using the hvcc
241 if (c
->extradata
[0] != 1) {
243 if (avio_open_dyn_buf(&pb
) < 0)
245 if (ff_isom_write_hvcc(pb
, c
->extradata
, c
->extradata_size
, 0) < 0) {
246 avio_close_dyn_buf(pb
, &tmpbuf
);
249 extradata_size
= avio_close_dyn_buf(pb
, &extradata
);
253 if (extradata_size
< 23)
256 num_arrays
= extradata
[22];
258 for (i
= 0; i
< num_arrays
; i
++) {
259 int num_nalus
, nalu_type
;
260 if (pos
+ 3 > extradata_size
)
262 nalu_type
= extradata
[pos
] & 0x3f;
263 // Not including libavcodec/hevc.h to avoid confusion between
264 // NAL_* with the same name for both H264 and HEVC.
265 if (nalu_type
== 32) // VPS
267 else if (nalu_type
== 33) // SPS
269 else if (nalu_type
== 34) // PPS
271 num_nalus
= AV_RB16(&extradata
[pos
+ 1]);
273 for (j
= 0; j
< num_nalus
; j
++) {
275 if (pos
+ 2 > extradata_size
)
277 len
= AV_RB16(&extradata
[pos
]);
279 if (pos
+ len
> extradata_size
)
284 if (!ps_pos
[0] || !ps_pos
[1] || !ps_pos
[2])
287 psets
= av_mallocz(MAX_PSET_SIZE
);
292 for (i
= 0; i
< 3; i
++) {
296 av_strlcat(psets
, "; ", MAX_PSET_SIZE
);
297 av_strlcatf(psets
, MAX_PSET_SIZE
, "sprop-%s=", ps_names
[i
]);
299 // Skipping boundary checks in the input here; we've already traversed
300 // the whole hvcc structure above without issues
301 num_nalus
= AV_RB16(&extradata
[pos
+ 1]);
303 for (j
= 0; j
< num_nalus
; j
++) {
304 int len
= AV_RB16(&extradata
[pos
]);
308 av_strlcat(psets
, ",", MAX_PSET_SIZE
);
309 strpos
= strlen(psets
);
310 if (!av_base64_encode(psets
+ strpos
, MAX_PSET_SIZE
- strpos
,
311 &extradata
[pos
], len
)) {
327 static char *extradata2config(AVCodecContext
*c
)
331 if (c
->extradata_size
> MAX_EXTRADATA_SIZE
) {
332 av_log(c
, AV_LOG_ERROR
, "Too much extradata!\n");
336 config
= av_malloc(10 + c
->extradata_size
* 2);
338 av_log(c
, AV_LOG_ERROR
, "Cannot allocate memory for the config info.\n");
341 memcpy(config
, "; config=", 9);
342 ff_data_to_hex(config
+ 9, c
->extradata
, c
->extradata_size
, 0);
343 config
[9 + c
->extradata_size
* 2] = 0;
348 static char *xiph_extradata2config(AVCodecContext
*c
)
350 char *config
, *encoded_config
;
351 uint8_t *header_start
[3];
352 int headers_len
, header_len
[3], config_len
;
353 int first_header_size
;
355 switch (c
->codec_id
) {
356 case AV_CODEC_ID_THEORA
:
357 first_header_size
= 42;
359 case AV_CODEC_ID_VORBIS
:
360 first_header_size
= 30;
363 av_log(c
, AV_LOG_ERROR
, "Unsupported Xiph codec ID\n");
367 if (avpriv_split_xiph_headers(c
->extradata
, c
->extradata_size
,
368 first_header_size
, header_start
,
370 av_log(c
, AV_LOG_ERROR
, "Extradata corrupt.\n");
374 headers_len
= header_len
[0] + header_len
[2];
375 config_len
= 4 + // count
380 headers_len
; // and the rest
382 config
= av_malloc(config_len
);
386 encoded_config
= av_malloc(AV_BASE64_SIZE(config_len
));
387 if (!encoded_config
) {
392 config
[0] = config
[1] = config
[2] = 0;
394 config
[4] = (RTP_XIPH_IDENT
>> 16) & 0xff;
395 config
[5] = (RTP_XIPH_IDENT
>> 8) & 0xff;
396 config
[6] = (RTP_XIPH_IDENT
) & 0xff;
397 config
[7] = (headers_len
>> 8) & 0xff;
398 config
[8] = headers_len
& 0xff;
400 config
[10] = header_len
[0];
401 config
[11] = 0; // size of comment header; nonexistent
402 memcpy(config
+ 12, header_start
[0], header_len
[0]);
403 memcpy(config
+ 12 + header_len
[0], header_start
[2], header_len
[2]);
405 av_base64_encode(encoded_config
, AV_BASE64_SIZE(config_len
),
409 return encoded_config
;
412 av_log(c
, AV_LOG_ERROR
,
413 "Not enough memory for configuration string\n");
417 static int latm_context2profilelevel(AVCodecContext
*c
)
420 * The RTP payload format specification is described in RFC 3016
421 * The encoding specifications are provided in ISO/IEC 14496-3 */
423 int profile_level
= 0x2B;
425 /* TODO: AAC Profile only supports AAC LC Object Type.
426 * Different Object Types should implement different Profile Levels */
428 if (c
->sample_rate
<= 24000) {
429 if (c
->channels
<= 2)
430 profile_level
= 0x28; // AAC Profile, Level 1
431 } else if (c
->sample_rate
<= 48000) {
432 if (c
->channels
<= 2) {
433 profile_level
= 0x29; // AAC Profile, Level 2
434 } else if (c
->channels
<= 5) {
435 profile_level
= 0x2A; // AAC Profile, Level 4
437 } else if (c
->sample_rate
<= 96000) {
438 if (c
->channels
<= 5) {
439 profile_level
= 0x2B; // AAC Profile, Level 5
443 return profile_level
;
446 static char *latm_context2config(AVCodecContext
*c
)
449 * The RTP payload format specification is described in RFC 3016
450 * The encoding specifications are provided in ISO/IEC 14496-3 */
452 uint8_t config_byte
[6];
456 for (rate_index
= 0; rate_index
< 16; rate_index
++)
457 if (avpriv_mpeg4audio_sample_rates
[rate_index
] == c
->sample_rate
)
459 if (rate_index
== 16) {
460 av_log(c
, AV_LOG_ERROR
, "Unsupported sample rate\n");
464 config_byte
[0] = 0x40;
466 config_byte
[2] = 0x20 | rate_index
;
467 config_byte
[3] = c
->channels
<< 4;
468 config_byte
[4] = 0x3f;
469 config_byte
[5] = 0xc0;
471 config
= av_malloc(6*2+1);
473 av_log(c
, AV_LOG_ERROR
, "Cannot allocate memory for the config info.\n");
476 ff_data_to_hex(config
, config_byte
, 6, 1);
482 static char *sdp_write_media_attributes(char *buff
, int size
, AVCodecContext
*c
, int payload_type
, AVFormatContext
*fmt
)
486 switch (c
->codec_id
) {
487 case AV_CODEC_ID_H264
: {
489 if (fmt
&& fmt
->oformat
&& fmt
->oformat
->priv_class
&&
490 av_opt_flag_is_set(fmt
->priv_data
, "rtpflags", "h264_mode0"))
492 if (c
->extradata_size
) {
493 config
= extradata2psets(c
);
495 av_strlcatf(buff
, size
, "a=rtpmap:%d H264/90000\r\n"
496 "a=fmtp:%d packetization-mode=%d%s\r\n",
498 payload_type
, mode
, config
? config
: "");
501 case AV_CODEC_ID_H261
:
503 const char *pic_fmt
= NULL
;
504 /* only QCIF and CIF are specified as supported in RFC 4587 */
505 if (c
->width
== 176 && c
->height
== 144)
507 if (c
->width
== 352 && c
->height
== 288)
509 av_strlcatf(buff
, size
, "a=rtpmap:%d H261/90000\r\n", payload_type
);
511 av_strlcatf(buff
, size
, "a=fmtp:%d %s\r\n", payload_type
, pic_fmt
);
514 case AV_CODEC_ID_H263
:
515 case AV_CODEC_ID_H263P
:
516 /* a=framesize is required by 3GPP TS 26.234 (PSS). It
517 * actually specifies the maximum video size, but we only know
518 * the current size. This is required for playback on Android
519 * stagefright and on Samsung bada. */
520 if (!fmt
|| !fmt
->oformat
->priv_class
||
521 !av_opt_flag_is_set(fmt
->priv_data
, "rtpflags", "rfc2190") ||
522 c
->codec_id
== AV_CODEC_ID_H263P
)
523 av_strlcatf(buff
, size
, "a=rtpmap:%d H263-2000/90000\r\n"
524 "a=framesize:%d %d-%d\r\n",
526 payload_type
, c
->width
, c
->height
);
528 case AV_CODEC_ID_HEVC
:
529 if (c
->extradata_size
)
530 config
= extradata2psets_hevc(c
);
531 av_strlcatf(buff
, size
, "a=rtpmap:%d H265/90000\r\n", payload_type
);
533 av_strlcatf(buff
, size
, "a=fmtp:%d %s\r\n",
534 payload_type
, config
);
536 case AV_CODEC_ID_MPEG4
:
537 if (c
->extradata_size
) {
538 config
= extradata2config(c
);
540 av_strlcatf(buff
, size
, "a=rtpmap:%d MP4V-ES/90000\r\n"
541 "a=fmtp:%d profile-level-id=1%s\r\n",
543 payload_type
, config
? config
: "");
545 case AV_CODEC_ID_AAC
:
546 if (fmt
&& fmt
->oformat
&& fmt
->oformat
->priv_class
&&
547 av_opt_flag_is_set(fmt
->priv_data
, "rtpflags", "latm")) {
548 config
= latm_context2config(c
);
551 av_strlcatf(buff
, size
, "a=rtpmap:%d MP4A-LATM/%d/%d\r\n"
552 "a=fmtp:%d profile-level-id=%d;cpresent=0;config=%s\r\n",
553 payload_type
, c
->sample_rate
, c
->channels
,
554 payload_type
, latm_context2profilelevel(c
), config
);
556 if (c
->extradata_size
) {
557 config
= extradata2config(c
);
559 /* FIXME: maybe we can forge config information based on the
560 * codec parameters...
562 av_log(c
, AV_LOG_ERROR
, "AAC with no global headers is currently not supported.\n");
568 av_strlcatf(buff
, size
, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n"
569 "a=fmtp:%d profile-level-id=1;"
570 "mode=AAC-hbr;sizelength=13;indexlength=3;"
571 "indexdeltalength=3%s\r\n",
572 payload_type
, c
->sample_rate
, c
->channels
,
573 payload_type
, config
);
576 case AV_CODEC_ID_PCM_S16BE
:
577 if (payload_type
>= RTP_PT_PRIVATE
)
578 av_strlcatf(buff
, size
, "a=rtpmap:%d L16/%d/%d\r\n",
580 c
->sample_rate
, c
->channels
);
582 case AV_CODEC_ID_PCM_MULAW
:
583 if (payload_type
>= RTP_PT_PRIVATE
)
584 av_strlcatf(buff
, size
, "a=rtpmap:%d PCMU/%d/%d\r\n",
586 c
->sample_rate
, c
->channels
);
588 case AV_CODEC_ID_PCM_ALAW
:
589 if (payload_type
>= RTP_PT_PRIVATE
)
590 av_strlcatf(buff
, size
, "a=rtpmap:%d PCMA/%d/%d\r\n",
592 c
->sample_rate
, c
->channels
);
594 case AV_CODEC_ID_AMR_NB
:
595 av_strlcatf(buff
, size
, "a=rtpmap:%d AMR/%d/%d\r\n"
596 "a=fmtp:%d octet-align=1\r\n",
597 payload_type
, c
->sample_rate
, c
->channels
,
600 case AV_CODEC_ID_AMR_WB
:
601 av_strlcatf(buff
, size
, "a=rtpmap:%d AMR-WB/%d/%d\r\n"
602 "a=fmtp:%d octet-align=1\r\n",
603 payload_type
, c
->sample_rate
, c
->channels
,
606 case AV_CODEC_ID_VORBIS
:
607 if (c
->extradata_size
)
608 config
= xiph_extradata2config(c
);
610 av_log(c
, AV_LOG_ERROR
, "Vorbis configuration info missing\n");
614 av_strlcatf(buff
, size
, "a=rtpmap:%d vorbis/%d/%d\r\n"
615 "a=fmtp:%d configuration=%s\r\n",
616 payload_type
, c
->sample_rate
, c
->channels
,
617 payload_type
, config
);
619 case AV_CODEC_ID_THEORA
: {
621 switch (c
->pix_fmt
) {
622 case AV_PIX_FMT_YUV420P
:
623 pix_fmt
= "YCbCr-4:2:0";
625 case AV_PIX_FMT_YUV422P
:
626 pix_fmt
= "YCbCr-4:2:2";
628 case AV_PIX_FMT_YUV444P
:
629 pix_fmt
= "YCbCr-4:4:4";
632 av_log(c
, AV_LOG_ERROR
, "Unsupported pixel format.\n");
636 if (c
->extradata_size
)
637 config
= xiph_extradata2config(c
);
639 av_log(c
, AV_LOG_ERROR
, "Theora configuation info missing\n");
643 av_strlcatf(buff
, size
, "a=rtpmap:%d theora/90000\r\n"
644 "a=fmtp:%d delivery-method=inline; "
645 "width=%d; height=%d; sampling=%s; "
646 "configuration=%s\r\n",
647 payload_type
, payload_type
,
648 c
->width
, c
->height
, pix_fmt
, config
);
651 case AV_CODEC_ID_VP8
:
652 av_strlcatf(buff
, size
, "a=rtpmap:%d VP8/90000\r\n",
655 case AV_CODEC_ID_MJPEG
:
656 if (payload_type
>= RTP_PT_PRIVATE
)
657 av_strlcatf(buff
, size
, "a=rtpmap:%d JPEG/90000\r\n",
660 case AV_CODEC_ID_ADPCM_G722
:
661 if (payload_type
>= RTP_PT_PRIVATE
)
662 av_strlcatf(buff
, size
, "a=rtpmap:%d G722/%d/%d\r\n",
666 case AV_CODEC_ID_ADPCM_G726
: {
667 if (payload_type
>= RTP_PT_PRIVATE
)
668 av_strlcatf(buff
, size
, "a=rtpmap:%d G726-%d/%d\r\n",
670 c
->bits_per_coded_sample
*8,
674 case AV_CODEC_ID_ILBC
:
675 av_strlcatf(buff
, size
, "a=rtpmap:%d iLBC/%d\r\n"
676 "a=fmtp:%d mode=%d\r\n",
677 payload_type
, c
->sample_rate
,
678 payload_type
, c
->block_align
== 38 ? 20 : 30);
680 case AV_CODEC_ID_SPEEX
:
681 av_strlcatf(buff
, size
, "a=rtpmap:%d speex/%d\r\n",
682 payload_type
, c
->sample_rate
);
687 if (c
->flags
& CODEC_FLAG_QSCALE
)
689 else if (!av_opt_get_int(c
, "vad", AV_OPT_FLAG_ENCODING_PARAM
, &vad_option
) && vad_option
)
694 av_strlcatf(buff
, size
, "a=fmtp:%d vbr=%s\r\n",
698 case AV_CODEC_ID_OPUS
:
699 /* The opus RTP draft says that all opus streams MUST be declared
700 as stereo, to avoid negotiation failures. The actual number of
701 channels can change on a packet-by-packet basis. The number of
702 channels a receiver prefers to receive or a sender plans to send
703 can be declared via fmtp parameters (both default to mono), but
704 receivers MUST be able to receive and process stereo packets. */
705 av_strlcatf(buff
, size
, "a=rtpmap:%d opus/48000/2\r\n",
707 if (c
->channels
== 2) {
708 av_strlcatf(buff
, size
, "a=fmtp:%d sprop-stereo:1\r\n",
713 /* Nothing special to do here... */
722 void ff_sdp_write_media(char *buff
, int size
, AVStream
*st
, int idx
,
723 const char *dest_addr
, const char *dest_type
,
724 int port
, int ttl
, AVFormatContext
*fmt
)
726 AVCodecContext
*c
= st
->codec
;
730 payload_type
= ff_rtp_get_payload_type(fmt
, c
, idx
);
732 switch (c
->codec_type
) {
733 case AVMEDIA_TYPE_VIDEO
: type
= "video" ; break;
734 case AVMEDIA_TYPE_AUDIO
: type
= "audio" ; break;
735 case AVMEDIA_TYPE_SUBTITLE
: type
= "text" ; break;
736 default : type
= "application"; break;
739 av_strlcatf(buff
, size
, "m=%s %d RTP/AVP %d\r\n", type
, port
, payload_type
);
740 sdp_write_address(buff
, size
, dest_addr
, dest_type
, ttl
);
742 av_strlcatf(buff
, size
, "b=AS:%d\r\n", c
->bit_rate
/ 1000);
745 sdp_write_media_attributes(buff
, size
, c
, payload_type
, fmt
);
748 int av_sdp_create(AVFormatContext
*ac
[], int n_files
, char *buf
, int size
)
750 AVDictionaryEntry
*title
= av_dict_get(ac
[0]->metadata
, "title", NULL
, 0);
751 struct sdp_session_level s
= { 0 };
752 int i
, j
, port
, ttl
, is_multicast
, index
= 0;
753 char dst
[32], dst_type
[5];
755 memset(buf
, 0, size
);
757 s
.src_addr
= "127.0.0.1"; /* FIXME: Properly set this */
759 s
.name
= title
? title
->value
: "No Name";
764 port
= sdp_get_address(dst
, sizeof(dst
), &ttl
, ac
[0]->filename
);
765 is_multicast
= resolve_destination(dst
, sizeof(dst
), dst_type
,
771 s
.dst_type
= dst_type
;
773 if (!strcmp(dst_type
, "IP6")) {
779 sdp_write_header(buf
, size
, &s
);
782 for (i
= 0; i
< n_files
; i
++) {
784 port
= sdp_get_address(dst
, sizeof(dst
), &ttl
, ac
[i
]->filename
);
785 is_multicast
= resolve_destination(dst
, sizeof(dst
), dst_type
,
790 for (j
= 0; j
< ac
[i
]->nb_streams
; j
++) {
791 ff_sdp_write_media(buf
, size
, ac
[i
]->streams
[j
], index
++,
792 dst
[0] ? dst
: NULL
, dst_type
,
793 (port
> 0) ? port
+ j
* 2 : 0,
796 av_strlcatf(buf
, size
,
797 "a=control:streamid=%d\r\n", i
+ j
);
799 if (ac
[i
]->pb
&& ac
[i
]->pb
->av_class
) {
800 uint8_t *crypto_suite
= NULL
, *crypto_params
= NULL
;
801 av_opt_get(ac
[i
]->pb
, "srtp_out_suite", AV_OPT_SEARCH_CHILDREN
,
803 av_opt_get(ac
[i
]->pb
, "srtp_out_params", AV_OPT_SEARCH_CHILDREN
,
805 if (crypto_suite
&& crypto_suite
[0])
806 av_strlcatf(buf
, size
,
807 "a=crypto:1 %s inline:%s\r\n",
808 crypto_suite
, crypto_params
);
809 av_free(crypto_suite
);
810 av_free(crypto_params
);
818 int av_sdp_create(AVFormatContext
*ac
[], int n_files
, char *buf
, int size
)
820 return AVERROR(ENOSYS
);
823 void ff_sdp_write_media(char *buff
, int size
, AVStream
*st
, int idx
,
824 const char *dest_addr
, const char *dest_type
,
825 int port
, int ttl
, AVFormatContext
*fmt
)