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path: root/libavformat/sdp.c (plain)
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1/*
2 * copyright (c) 2007 Luca Abeni
3 *
4 * This file is part of FFmpeg.
5 *
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.
10 *
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.
15 *
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
19 */
20
21#include <string.h>
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"
29#include "avformat.h"
30#include "internal.h"
31#include "avc.h"
32#include "hevc.h"
33#include "rtp.h"
34#if CONFIG_NETWORK
35#include "network.h"
36#endif
37
38#if CONFIG_RTP_MUXER
39#define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2)
40
41struct 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) */
56};
57
58static void sdp_write_address(char *buff, int size, const char *dest_addr,
59 const char *dest_type, int ttl)
60{
61 if (dest_addr) {
62 if (!dest_type)
63 dest_type = "IP4";
64 if (ttl > 0 && !strcmp(dest_type, "IP4")) {
65 /* The TTL should only be specified for IPv4 multicast addresses,
66 * not for IPv6. */
67 av_strlcatf(buff, size, "c=IN %s %s/%d\r\n", dest_type, dest_addr, ttl);
68 } else {
69 av_strlcatf(buff, size, "c=IN %s %s\r\n", dest_type, dest_addr);
70 }
71 }
72}
73
74static void sdp_write_header(char *buff, int size, struct sdp_session_level *s)
75{
76 av_strlcatf(buff, size, "v=%d\r\n"
77 "o=- %d %d IN %s %s\r\n"
78 "s=%s\r\n",
79 s->sdp_version,
80 s->id, s->version, s->src_type, s->src_addr,
81 s->name);
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);
86}
87
88#if CONFIG_NETWORK
89static int resolve_destination(char *dest_addr, int size, char *type,
90 int type_size)
91{
92 struct addrinfo hints = { 0 }, *ai;
93 int is_multicast;
94
95 av_strlcpy(type, "IP4", type_size);
96 if (!dest_addr[0])
97 return 0;
98
99 /* Resolve the destination, since it must be written
100 * as a numeric IP address in the SDP. */
101
102 if (getaddrinfo(dest_addr, NULL, &hints, &ai))
103 return 0;
104 getnameinfo(ai->ai_addr, ai->ai_addrlen, dest_addr, size,
105 NULL, 0, NI_NUMERICHOST);
106#ifdef AF_INET6
107 if (ai->ai_family == AF_INET6)
108 av_strlcpy(type, "IP6", type_size);
109#endif
110 is_multicast = ff_is_multicast_address(ai->ai_addr);
111 freeaddrinfo(ai);
112 return is_multicast;
113}
114#else
115static int resolve_destination(char *dest_addr, int size, char *type,
116 int type_size)
117{
118 return 0;
119}
120#endif
121
122static int sdp_get_address(char *dest_addr, int size, int *ttl, const char *url)
123{
124 int port;
125 const char *p;
126 char proto[32];
127
128 av_url_split(proto, sizeof(proto), NULL, 0, dest_addr, size, &port, NULL, 0, url);
129
130 *ttl = 0;
131
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.
135 */
136 return 0;
137 }
138
139 p = strchr(url, '?');
140 if (p) {
141 char buff[64];
142
143 if (av_find_info_tag(buff, sizeof(buff), "ttl", p)) {
144 *ttl = strtol(buff, NULL, 10);
145 } else {
146 *ttl = 5;
147 }
148 }
149
150 return port;
151}
152
153#define MAX_PSET_SIZE 1024
154static char *extradata2psets(AVFormatContext *s, AVCodecParameters *par)
155{
156 char *psets, *p;
157 const uint8_t *r;
158 static const char pset_string[] = "; sprop-parameter-sets=";
159 static const char profile_string[] = "; profile-level-id=";
160 uint8_t *extradata = par->extradata;
161 int extradata_size = par->extradata_size;
162 uint8_t *tmpbuf = NULL;
163 const uint8_t *sps = NULL, *sps_end;
164
165 if (par->extradata_size > MAX_EXTRADATA_SIZE) {
166 av_log(s, AV_LOG_ERROR, "Too much extradata!\n");
167
168 return NULL;
169 }
170 if (par->extradata[0] == 1) {
171 if (ff_avc_write_annexb_extradata(par->extradata, &extradata,
172 &extradata_size))
173 return NULL;
174 tmpbuf = extradata;
175 }
176
177 psets = av_mallocz(MAX_PSET_SIZE);
178 if (!psets) {
179 av_log(s, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n");
180 av_free(tmpbuf);
181 return NULL;
182 }
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) {
187 const uint8_t *r1;
188 uint8_t nal_type;
189
190 while (!*(r++));
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 */
194 r = r1;
195 continue;
196 }
197 if (p != (psets + strlen(pset_string))) {
198 *p = ',';
199 p++;
200 }
201 if (!sps) {
202 sps = r;
203 sps_end = r1;
204 }
205 if (!av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r)) {
206 av_log(s, AV_LOG_ERROR, "Cannot Base64-encode %"PTRDIFF_SPECIFIER" %"PTRDIFF_SPECIFIER"!\n", MAX_PSET_SIZE - (p - psets), r1 - r);
207 av_free(psets);
208 av_free(tmpbuf);
209
210 return NULL;
211 }
212 p += strlen(p);
213 r = r1;
214 }
215 if (sps && sps_end - sps >= 4) {
216 memcpy(p, profile_string, strlen(profile_string));
217 p += strlen(p);
218 ff_data_to_hex(p, sps + 1, 3, 0);
219 p[6] = '\0';
220 }
221 av_free(tmpbuf);
222
223 return psets;
224}
225
226static char *extradata2psets_hevc(AVCodecParameters *par)
227{
228 char *psets;
229 uint8_t *extradata = par->extradata;
230 int extradata_size = par->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;
235 int pos, i, j;
236
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
240 // format.
241 if (par->extradata[0] != 1) {
242 AVIOContext *pb;
243 if (avio_open_dyn_buf(&pb) < 0)
244 return NULL;
245 if (ff_isom_write_hvcc(pb, par->extradata, par->extradata_size, 0) < 0) {
246 avio_close_dyn_buf(pb, &tmpbuf);
247 goto err;
248 }
249 extradata_size = avio_close_dyn_buf(pb, &extradata);
250 tmpbuf = extradata;
251 }
252
253 if (extradata_size < 23)
254 goto err;
255
256 num_arrays = extradata[22];
257 pos = 23;
258 for (i = 0; i < num_arrays; i++) {
259 int num_nalus, nalu_type;
260 if (pos + 3 > extradata_size)
261 goto err;
262 nalu_type = extradata[pos] & 0x3f;
263 // Not including libavcodec/hevc.h to avoid confusion between
264 // NAL_* with the same name for both H.264 and HEVC.
265 if (nalu_type == 32) // VPS
266 ps_pos[0] = pos;
267 else if (nalu_type == 33) // SPS
268 ps_pos[1] = pos;
269 else if (nalu_type == 34) // PPS
270 ps_pos[2] = pos;
271 num_nalus = AV_RB16(&extradata[pos + 1]);
272 pos += 3;
273 for (j = 0; j < num_nalus; j++) {
274 int len;
275 if (pos + 2 > extradata_size)
276 goto err;
277 len = AV_RB16(&extradata[pos]);
278 pos += 2;
279 if (pos + len > extradata_size)
280 goto err;
281 pos += len;
282 }
283 }
284 if (!ps_pos[0] || !ps_pos[1] || !ps_pos[2])
285 goto err;
286
287 psets = av_mallocz(MAX_PSET_SIZE);
288 if (!psets)
289 goto err;
290 psets[0] = '\0';
291
292 for (i = 0; i < 3; i++) {
293 pos = ps_pos[i];
294
295 if (i > 0)
296 av_strlcat(psets, "; ", MAX_PSET_SIZE);
297 av_strlcatf(psets, MAX_PSET_SIZE, "sprop-%s=", ps_names[i]);
298
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]);
302 pos += 3;
303 for (j = 0; j < num_nalus; j++) {
304 int len = AV_RB16(&extradata[pos]);
305 int strpos;
306 pos += 2;
307 if (j > 0)
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)) {
312 av_free(psets);
313 goto err;
314 }
315 pos += len;
316 }
317 }
318 av_free(tmpbuf);
319
320 return psets;
321
322err:
323 av_free(tmpbuf);
324 return NULL;
325}
326
327static char *extradata2config(AVFormatContext *s, AVCodecParameters *par)
328{
329 char *config;
330
331 if (par->extradata_size > MAX_EXTRADATA_SIZE) {
332 av_log(s, AV_LOG_ERROR, "Too much extradata!\n");
333
334 return NULL;
335 }
336 config = av_malloc(10 + par->extradata_size * 2);
337 if (!config) {
338 av_log(s, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
339 return NULL;
340 }
341 memcpy(config, "; config=", 9);
342 ff_data_to_hex(config + 9, par->extradata, par->extradata_size, 0);
343 config[9 + par->extradata_size * 2] = 0;
344
345 return config;
346}
347
348static char *xiph_extradata2config(AVFormatContext *s, AVCodecParameters *par)
349{
350 char *config, *encoded_config;
351 const uint8_t *header_start[3];
352 int headers_len, header_len[3], config_len;
353 int first_header_size;
354
355 switch (par->codec_id) {
356 case AV_CODEC_ID_THEORA:
357 first_header_size = 42;
358 break;
359 case AV_CODEC_ID_VORBIS:
360 first_header_size = 30;
361 break;
362 default:
363 av_log(s, AV_LOG_ERROR, "Unsupported Xiph codec ID\n");
364 return NULL;
365 }
366
367 if (avpriv_split_xiph_headers(par->extradata, par->extradata_size,
368 first_header_size, header_start,
369 header_len) < 0) {
370 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
371 return NULL;
372 }
373
374 headers_len = header_len[0] + header_len[2];
375 config_len = 4 + // count
376 3 + // ident
377 2 + // packet size
378 1 + // header count
379 2 + // header size
380 headers_len; // and the rest
381
382 config = av_malloc(config_len);
383 if (!config)
384 goto xiph_fail;
385
386 encoded_config = av_malloc(AV_BASE64_SIZE(config_len));
387 if (!encoded_config) {
388 av_free(config);
389 goto xiph_fail;
390 }
391
392 config[0] = config[1] = config[2] = 0;
393 config[3] = 1;
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;
399 config[9] = 2;
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]);
404
405 av_base64_encode(encoded_config, AV_BASE64_SIZE(config_len),
406 config, config_len);
407 av_free(config);
408
409 return encoded_config;
410
411xiph_fail:
412 av_log(s, AV_LOG_ERROR,
413 "Not enough memory for configuration string\n");
414 return NULL;
415}
416
417static int latm_context2profilelevel(AVCodecParameters *par)
418{
419 /* MP4A-LATM
420 * The RTP payload format specification is described in RFC 3016
421 * The encoding specifications are provided in ISO/IEC 14496-3 */
422
423 int profile_level = 0x2B;
424
425 /* TODO: AAC Profile only supports AAC LC Object Type.
426 * Different Object Types should implement different Profile Levels */
427
428 if (par->sample_rate <= 24000) {
429 if (par->channels <= 2)
430 profile_level = 0x28; // AAC Profile, Level 1
431 } else if (par->sample_rate <= 48000) {
432 if (par->channels <= 2) {
433 profile_level = 0x29; // AAC Profile, Level 2
434 } else if (par->channels <= 5) {
435 profile_level = 0x2A; // AAC Profile, Level 4
436 }
437 } else if (par->sample_rate <= 96000) {
438 if (par->channels <= 5) {
439 profile_level = 0x2B; // AAC Profile, Level 5
440 }
441 }
442
443 return profile_level;
444}
445
446static char *latm_context2config(AVFormatContext *s, AVCodecParameters *par)
447{
448 /* MP4A-LATM
449 * The RTP payload format specification is described in RFC 3016
450 * The encoding specifications are provided in ISO/IEC 14496-3 */
451
452 uint8_t config_byte[6];
453 int rate_index;
454 char *config;
455
456 for (rate_index = 0; rate_index < 16; rate_index++)
457 if (avpriv_mpeg4audio_sample_rates[rate_index] == par->sample_rate)
458 break;
459 if (rate_index == 16) {
460 av_log(s, AV_LOG_ERROR, "Unsupported sample rate\n");
461 return NULL;
462 }
463
464 config_byte[0] = 0x40;
465 config_byte[1] = 0;
466 config_byte[2] = 0x20 | rate_index;
467 config_byte[3] = par->channels << 4;
468 config_byte[4] = 0x3f;
469 config_byte[5] = 0xc0;
470
471 config = av_malloc(6*2+1);
472 if (!config) {
473 av_log(s, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
474 return NULL;
475 }
476 ff_data_to_hex(config, config_byte, 6, 1);
477 config[12] = 0;
478
479 return config;
480}
481
482static char *sdp_write_media_attributes(char *buff, int size, AVStream *st, int payload_type, AVFormatContext *fmt)
483{
484 char *config = NULL;
485 AVCodecParameters *p = st->codecpar;
486
487 switch (p->codec_id) {
488 case AV_CODEC_ID_DIRAC:
489 av_strlcatf(buff, size, "a=rtpmap:%d VC2/90000\r\n", payload_type);
490 break;
491 case AV_CODEC_ID_H264: {
492 int mode = 1;
493 if (fmt && fmt->oformat && fmt->oformat->priv_class &&
494 av_opt_flag_is_set(fmt->priv_data, "rtpflags", "h264_mode0"))
495 mode = 0;
496 if (p->extradata_size) {
497 config = extradata2psets(fmt, p);
498 }
499 av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n"
500 "a=fmtp:%d packetization-mode=%d%s\r\n",
501 payload_type,
502 payload_type, mode, config ? config : "");
503 break;
504 }
505 case AV_CODEC_ID_H261:
506 {
507 const char *pic_fmt = NULL;
508 /* only QCIF and CIF are specified as supported in RFC 4587 */
509 if (p->width == 176 && p->height == 144)
510 pic_fmt = "QCIF=1";
511 else if (p->width == 352 && p->height == 288)
512 pic_fmt = "CIF=1";
513 if (payload_type >= RTP_PT_PRIVATE)
514 av_strlcatf(buff, size, "a=rtpmap:%d H261/90000\r\n", payload_type);
515 if (pic_fmt)
516 av_strlcatf(buff, size, "a=fmtp:%d %s\r\n", payload_type, pic_fmt);
517 break;
518 }
519 case AV_CODEC_ID_H263:
520 case AV_CODEC_ID_H263P:
521 /* a=framesize is required by 3GPP TS 26.234 (PSS). It
522 * actually specifies the maximum video size, but we only know
523 * the current size. This is required for playback on Android
524 * stagefright and on Samsung bada. */
525 if (!fmt || !fmt->oformat->priv_class ||
526 !av_opt_flag_is_set(fmt->priv_data, "rtpflags", "rfc2190") ||
527 p->codec_id == AV_CODEC_ID_H263P)
528 av_strlcatf(buff, size, "a=rtpmap:%d H263-2000/90000\r\n"
529 "a=framesize:%d %d-%d\r\n",
530 payload_type,
531 payload_type, p->width, p->height);
532 break;
533 case AV_CODEC_ID_HEVC:
534 if (p->extradata_size)
535 config = extradata2psets_hevc(p);
536 av_strlcatf(buff, size, "a=rtpmap:%d H265/90000\r\n", payload_type);
537 if (config)
538 av_strlcatf(buff, size, "a=fmtp:%d %s\r\n",
539 payload_type, config);
540 break;
541 case AV_CODEC_ID_MPEG4:
542 if (p->extradata_size) {
543 config = extradata2config(fmt, p);
544 }
545 av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"
546 "a=fmtp:%d profile-level-id=1%s\r\n",
547 payload_type,
548 payload_type, config ? config : "");
549 break;
550 case AV_CODEC_ID_AAC:
551 if (fmt && fmt->oformat && fmt->oformat->priv_class &&
552 av_opt_flag_is_set(fmt->priv_data, "rtpflags", "latm")) {
553 config = latm_context2config(fmt, p);
554 if (!config)
555 return NULL;
556 av_strlcatf(buff, size, "a=rtpmap:%d MP4A-LATM/%d/%d\r\n"
557 "a=fmtp:%d profile-level-id=%d;cpresent=0;config=%s\r\n",
558 payload_type, p->sample_rate, p->channels,
559 payload_type, latm_context2profilelevel(p), config);
560 } else {
561 if (p->extradata_size) {
562 config = extradata2config(fmt, p);
563 } else {
564 /* FIXME: maybe we can forge config information based on the
565 * codec parameters...
566 */
567 av_log(fmt, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n");
568 return NULL;
569 }
570 if (!config) {
571 return NULL;
572 }
573 av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n"
574 "a=fmtp:%d profile-level-id=1;"
575 "mode=AAC-hbr;sizelength=13;indexlength=3;"
576 "indexdeltalength=3%s\r\n",
577 payload_type, p->sample_rate, p->channels,
578 payload_type, config);
579 }
580 break;
581 case AV_CODEC_ID_PCM_S16BE:
582 if (payload_type >= RTP_PT_PRIVATE)
583 av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n",
584 payload_type,
585 p->sample_rate, p->channels);
586 break;
587 case AV_CODEC_ID_PCM_MULAW:
588 if (payload_type >= RTP_PT_PRIVATE)
589 av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n",
590 payload_type,
591 p->sample_rate, p->channels);
592 break;
593 case AV_CODEC_ID_PCM_ALAW:
594 if (payload_type >= RTP_PT_PRIVATE)
595 av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n",
596 payload_type,
597 p->sample_rate, p->channels);
598 break;
599 case AV_CODEC_ID_AMR_NB:
600 av_strlcatf(buff, size, "a=rtpmap:%d AMR/%d/%d\r\n"
601 "a=fmtp:%d octet-align=1\r\n",
602 payload_type, p->sample_rate, p->channels,
603 payload_type);
604 break;
605 case AV_CODEC_ID_AMR_WB:
606 av_strlcatf(buff, size, "a=rtpmap:%d AMR-WB/%d/%d\r\n"
607 "a=fmtp:%d octet-align=1\r\n",
608 payload_type, p->sample_rate, p->channels,
609 payload_type);
610 break;
611 case AV_CODEC_ID_VORBIS:
612 if (p->extradata_size)
613 config = xiph_extradata2config(fmt, p);
614 else
615 av_log(fmt, AV_LOG_ERROR, "Vorbis configuration info missing\n");
616 if (!config)
617 return NULL;
618
619 av_strlcatf(buff, size, "a=rtpmap:%d vorbis/%d/%d\r\n"
620 "a=fmtp:%d configuration=%s\r\n",
621 payload_type, p->sample_rate, p->channels,
622 payload_type, config);
623 break;
624 case AV_CODEC_ID_THEORA: {
625 const char *pix_fmt;
626 switch (p->format) {
627 case AV_PIX_FMT_YUV420P:
628 pix_fmt = "YCbCr-4:2:0";
629 break;
630 case AV_PIX_FMT_YUV422P:
631 pix_fmt = "YCbCr-4:2:2";
632 break;
633 case AV_PIX_FMT_YUV444P:
634 pix_fmt = "YCbCr-4:4:4";
635 break;
636 default:
637 av_log(fmt, AV_LOG_ERROR, "Unsupported pixel format.\n");
638 return NULL;
639 }
640
641 if (p->extradata_size)
642 config = xiph_extradata2config(fmt, p);
643 else
644 av_log(fmt, AV_LOG_ERROR, "Theora configuration info missing\n");
645 if (!config)
646 return NULL;
647
648 av_strlcatf(buff, size, "a=rtpmap:%d theora/90000\r\n"
649 "a=fmtp:%d delivery-method=inline; "
650 "width=%d; height=%d; sampling=%s; "
651 "configuration=%s\r\n",
652 payload_type, payload_type,
653 p->width, p->height, pix_fmt, config);
654 break;
655 }
656 case AV_CODEC_ID_VP8:
657 av_strlcatf(buff, size, "a=rtpmap:%d VP8/90000\r\n",
658 payload_type);
659 break;
660 case AV_CODEC_ID_VP9:
661 av_strlcatf(buff, size, "a=rtpmap:%d VP9/90000\r\n",
662 payload_type);
663 break;
664 case AV_CODEC_ID_MJPEG:
665 if (payload_type >= RTP_PT_PRIVATE)
666 av_strlcatf(buff, size, "a=rtpmap:%d JPEG/90000\r\n",
667 payload_type);
668 break;
669 case AV_CODEC_ID_ADPCM_G722:
670 if (payload_type >= RTP_PT_PRIVATE)
671 av_strlcatf(buff, size, "a=rtpmap:%d G722/%d/%d\r\n",
672 payload_type,
673 8000, p->channels);
674 break;
675 case AV_CODEC_ID_ADPCM_G726: {
676 if (payload_type >= RTP_PT_PRIVATE)
677 av_strlcatf(buff, size, "a=rtpmap:%d G726-%d/%d\r\n",
678 payload_type,
679 p->bits_per_coded_sample*8,
680 p->sample_rate);
681 break;
682 }
683 case AV_CODEC_ID_ILBC:
684 av_strlcatf(buff, size, "a=rtpmap:%d iLBC/%d\r\n"
685 "a=fmtp:%d mode=%d\r\n",
686 payload_type, p->sample_rate,
687 payload_type, p->block_align == 38 ? 20 : 30);
688 break;
689 case AV_CODEC_ID_SPEEX:
690 av_strlcatf(buff, size, "a=rtpmap:%d speex/%d\r\n",
691 payload_type, p->sample_rate);
692 if (st->codec) {
693 const char *mode;
694 uint64_t vad_option;
695
696 if (st->codec->flags & AV_CODEC_FLAG_QSCALE)
697 mode = "on";
698 else if (!av_opt_get_int(st->codec, "vad", AV_OPT_FLAG_ENCODING_PARAM, &vad_option) && vad_option)
699 mode = "vad";
700 else
701 mode = "off";
702
703 av_strlcatf(buff, size, "a=fmtp:%d vbr=%s\r\n",
704 payload_type, mode);
705 }
706 break;
707 case AV_CODEC_ID_OPUS:
708 /* The opus RTP draft says that all opus streams MUST be declared
709 as stereo, to avoid negotiation failures. The actual number of
710 channels can change on a packet-by-packet basis. The number of
711 channels a receiver prefers to receive or a sender plans to send
712 can be declared via fmtp parameters (both default to mono), but
713 receivers MUST be able to receive and process stereo packets. */
714 av_strlcatf(buff, size, "a=rtpmap:%d opus/48000/2\r\n",
715 payload_type);
716 if (p->channels == 2) {
717 av_strlcatf(buff, size, "a=fmtp:%d sprop-stereo=1\r\n",
718 payload_type);
719 }
720 break;
721 default:
722 /* Nothing special to do here... */
723 break;
724 }
725
726 av_free(config);
727
728 return buff;
729}
730
731void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx,
732 const char *dest_addr, const char *dest_type,
733 int port, int ttl, AVFormatContext *fmt)
734{
735 AVCodecParameters *p = st->codecpar;
736 const char *type;
737 int payload_type;
738
739 payload_type = ff_rtp_get_payload_type(fmt, st->codecpar, idx);
740
741 switch (p->codec_type) {
742 case AVMEDIA_TYPE_VIDEO : type = "video" ; break;
743 case AVMEDIA_TYPE_AUDIO : type = "audio" ; break;
744 case AVMEDIA_TYPE_SUBTITLE: type = "text" ; break;
745 default : type = "application"; break;
746 }
747
748 av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);
749 sdp_write_address(buff, size, dest_addr, dest_type, ttl);
750 if (p->bit_rate) {
751 av_strlcatf(buff, size, "b=AS:%"PRId64"\r\n", (int64_t)p->bit_rate / 1000);
752 }
753
754 sdp_write_media_attributes(buff, size, st, payload_type, fmt);
755}
756
757int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
758{
759 AVDictionaryEntry *title = av_dict_get(ac[0]->metadata, "title", NULL, 0);
760 struct sdp_session_level s = { 0 };
761 int i, j, port, ttl, is_multicast, index = 0;
762 char dst[32], dst_type[5];
763
764 memset(buf, 0, size);
765 s.user = "-";
766 s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */
767 s.src_type = "IP4";
768 s.name = title ? title->value : "No Name";
769
770 port = 0;
771 ttl = 0;
772 if (n_files == 1) {
773 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[0]->filename);
774 is_multicast = resolve_destination(dst, sizeof(dst), dst_type,
775 sizeof(dst_type));
776 if (!is_multicast)
777 ttl = 0;
778 if (dst[0]) {
779 s.dst_addr = dst;
780 s.dst_type = dst_type;
781 s.ttl = ttl;
782 if (!strcmp(dst_type, "IP6")) {
783 s.src_addr = "::1";
784 s.src_type = "IP6";
785 }
786 }
787 }
788 sdp_write_header(buf, size, &s);
789
790 dst[0] = 0;
791 for (i = 0; i < n_files; i++) {
792 if (n_files != 1) {
793 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[i]->filename);
794 is_multicast = resolve_destination(dst, sizeof(dst), dst_type,
795 sizeof(dst_type));
796 if (!is_multicast)
797 ttl = 0;
798 }
799 for (j = 0; j < ac[i]->nb_streams; j++) {
800 ff_sdp_write_media(buf, size, ac[i]->streams[j], index++,
801 dst[0] ? dst : NULL, dst_type,
802 (port > 0) ? port + j * 2 : 0,
803 ttl, ac[i]);
804 if (port <= 0) {
805 av_strlcatf(buf, size,
806 "a=control:streamid=%d\r\n", i + j);
807 }
808 if (ac[i]->pb && ac[i]->pb->av_class) {
809 uint8_t *crypto_suite = NULL, *crypto_params = NULL;
810 av_opt_get(ac[i]->pb, "srtp_out_suite", AV_OPT_SEARCH_CHILDREN,
811 &crypto_suite);
812 av_opt_get(ac[i]->pb, "srtp_out_params", AV_OPT_SEARCH_CHILDREN,
813 &crypto_params);
814 if (crypto_suite && crypto_suite[0])
815 av_strlcatf(buf, size,
816 "a=crypto:1 %s inline:%s\r\n",
817 crypto_suite, crypto_params);
818 av_free(crypto_suite);
819 av_free(crypto_params);
820 }
821 }
822 }
823
824 return 0;
825}
826#else
827int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
828{
829 return AVERROR(ENOSYS);
830}
831
832void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx,
833 const char *dest_addr, const char *dest_type,
834 int port, int ttl, AVFormatContext *fmt)
835{
836}
837#endif
838
generated by cgit at 2024-05-17 04:15:52 (GMT)