FFmpeg  4.0
sdp.c
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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 
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) */
56 };
57 
58 static 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 
74 static 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
89 static 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
115 static int resolve_destination(char *dest_addr, int size, char *type,
116  int type_size)
117 {
118  return 0;
119 }
120 #endif
121 
122 static 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
154 static 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 
226 static 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 
322 err:
323  av_free(tmpbuf);
324  return NULL;
325 }
326 
327 static 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 
348 static 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 
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 
411 xiph_fail:
412  av_log(s, AV_LOG_ERROR,
413  "Not enough memory for configuration string\n");
414  return NULL;
415 }
416 
417 static 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 
446 static 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 
482 static 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") ||
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;
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;
588  if (payload_type >= RTP_PT_PRIVATE)
589  av_strlcatf(buff, size, "a=rtpmap:%d L24/%d/%d\r\n",
590  payload_type,
591  p->sample_rate, p->channels);
592  break;
594  if (payload_type >= RTP_PT_PRIVATE)
595  av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n",
596  payload_type,
597  p->sample_rate, p->channels);
598  break;
600  if (payload_type >= RTP_PT_PRIVATE)
601  av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n",
602  payload_type,
603  p->sample_rate, p->channels);
604  break;
605  case AV_CODEC_ID_AMR_NB:
606  av_strlcatf(buff, size, "a=rtpmap:%d AMR/%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_AMR_WB:
612  av_strlcatf(buff, size, "a=rtpmap:%d AMR-WB/%d/%d\r\n"
613  "a=fmtp:%d octet-align=1\r\n",
614  payload_type, p->sample_rate, p->channels,
615  payload_type);
616  break;
617  case AV_CODEC_ID_VORBIS:
618  if (p->extradata_size)
619  config = xiph_extradata2config(fmt, p);
620  else
621  av_log(fmt, AV_LOG_ERROR, "Vorbis configuration info missing\n");
622  if (!config)
623  return NULL;
624 
625  av_strlcatf(buff, size, "a=rtpmap:%d vorbis/%d/%d\r\n"
626  "a=fmtp:%d configuration=%s\r\n",
627  payload_type, p->sample_rate, p->channels,
628  payload_type, config);
629  break;
630  case AV_CODEC_ID_THEORA: {
631  const char *pix_fmt;
632  switch (p->format) {
633  case AV_PIX_FMT_YUV420P:
634  pix_fmt = "YCbCr-4:2:0";
635  break;
636  case AV_PIX_FMT_YUV422P:
637  pix_fmt = "YCbCr-4:2:2";
638  break;
639  case AV_PIX_FMT_YUV444P:
640  pix_fmt = "YCbCr-4:4:4";
641  break;
642  default:
643  av_log(fmt, AV_LOG_ERROR, "Unsupported pixel format.\n");
644  return NULL;
645  }
646 
647  if (p->extradata_size)
648  config = xiph_extradata2config(fmt, p);
649  else
650  av_log(fmt, AV_LOG_ERROR, "Theora configuration info missing\n");
651  if (!config)
652  return NULL;
653 
654  av_strlcatf(buff, size, "a=rtpmap:%d theora/90000\r\n"
655  "a=fmtp:%d delivery-method=inline; "
656  "width=%d; height=%d; sampling=%s; "
657  "configuration=%s\r\n",
658  payload_type, payload_type,
659  p->width, p->height, pix_fmt, config);
660  break;
661  }
662  case AV_CODEC_ID_VP8:
663  av_strlcatf(buff, size, "a=rtpmap:%d VP8/90000\r\n",
664  payload_type);
665  break;
666  case AV_CODEC_ID_VP9:
667  av_strlcatf(buff, size, "a=rtpmap:%d VP9/90000\r\n",
668  payload_type);
669  break;
670  case AV_CODEC_ID_MJPEG:
671  if (payload_type >= RTP_PT_PRIVATE)
672  av_strlcatf(buff, size, "a=rtpmap:%d JPEG/90000\r\n",
673  payload_type);
674  break;
676  if (payload_type >= RTP_PT_PRIVATE)
677  av_strlcatf(buff, size, "a=rtpmap:%d G722/%d/%d\r\n",
678  payload_type,
679  8000, p->channels);
680  break;
681  case AV_CODEC_ID_ADPCM_G726: {
682  if (payload_type >= RTP_PT_PRIVATE)
683  av_strlcatf(buff, size, "a=rtpmap:%d AAL2-G726-%d/%d\r\n",
684  payload_type,
686  p->sample_rate);
687  break;
688  }
690  if (payload_type >= RTP_PT_PRIVATE)
691  av_strlcatf(buff, size, "a=rtpmap:%d G726-%d/%d\r\n",
692  payload_type,
694  p->sample_rate);
695  break;
696  }
697  case AV_CODEC_ID_ILBC:
698  av_strlcatf(buff, size, "a=rtpmap:%d iLBC/%d\r\n"
699  "a=fmtp:%d mode=%d\r\n",
700  payload_type, p->sample_rate,
701  payload_type, p->block_align == 38 ? 20 : 30);
702  break;
703  case AV_CODEC_ID_SPEEX:
704  av_strlcatf(buff, size, "a=rtpmap:%d speex/%d\r\n",
705  payload_type, p->sample_rate);
706  if (st->codec) {
707  const char *mode;
708  uint64_t vad_option;
709 
710  if (st->codec->flags & AV_CODEC_FLAG_QSCALE)
711  mode = "on";
712  else if (!av_opt_get_int(st->codec, "vad", AV_OPT_FLAG_ENCODING_PARAM, &vad_option) && vad_option)
713  mode = "vad";
714  else
715  mode = "off";
716 
717  av_strlcatf(buff, size, "a=fmtp:%d vbr=%s\r\n",
718  payload_type, mode);
719  }
720  break;
721  case AV_CODEC_ID_OPUS:
722  /* The opus RTP draft says that all opus streams MUST be declared
723  as stereo, to avoid negotiation failures. The actual number of
724  channels can change on a packet-by-packet basis. The number of
725  channels a receiver prefers to receive or a sender plans to send
726  can be declared via fmtp parameters (both default to mono), but
727  receivers MUST be able to receive and process stereo packets. */
728  av_strlcatf(buff, size, "a=rtpmap:%d opus/48000/2\r\n",
729  payload_type);
730  if (p->channels == 2) {
731  av_strlcatf(buff, size, "a=fmtp:%d sprop-stereo=1\r\n",
732  payload_type);
733  }
734  break;
735  default:
736  /* Nothing special to do here... */
737  break;
738  }
739 
740  av_free(config);
741 
742  return buff;
743 }
744 
745 void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx,
746  const char *dest_addr, const char *dest_type,
747  int port, int ttl, AVFormatContext *fmt)
748 {
749  AVCodecParameters *p = st->codecpar;
750  const char *type;
751  int payload_type;
752 
753  payload_type = ff_rtp_get_payload_type(fmt, st->codecpar, idx);
754 
755  switch (p->codec_type) {
756  case AVMEDIA_TYPE_VIDEO : type = "video" ; break;
757  case AVMEDIA_TYPE_AUDIO : type = "audio" ; break;
758  case AVMEDIA_TYPE_SUBTITLE: type = "text" ; break;
759  default : type = "application"; break;
760  }
761 
762  av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);
763  sdp_write_address(buff, size, dest_addr, dest_type, ttl);
764  if (p->bit_rate) {
765  av_strlcatf(buff, size, "b=AS:%"PRId64"\r\n", p->bit_rate / 1000);
766  }
767 
768  sdp_write_media_attributes(buff, size, st, payload_type, fmt);
769 }
770 
771 int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
772 {
773  AVDictionaryEntry *title = av_dict_get(ac[0]->metadata, "title", NULL, 0);
774  struct sdp_session_level s = { 0 };
775  int i, j, port, ttl, is_multicast, index = 0;
776  char dst[32], dst_type[5];
777 
778  memset(buf, 0, size);
779  s.user = "-";
780  s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */
781  s.src_type = "IP4";
782  s.name = title ? title->value : "No Name";
783 
784  port = 0;
785  ttl = 0;
786  if (n_files == 1) {
787  port = sdp_get_address(dst, sizeof(dst), &ttl, ac[0]->url ? ac[0]->url : "");
788  is_multicast = resolve_destination(dst, sizeof(dst), dst_type,
789  sizeof(dst_type));
790  if (!is_multicast)
791  ttl = 0;
792  if (dst[0]) {
793  s.dst_addr = dst;
794  s.dst_type = dst_type;
795  s.ttl = ttl;
796  if (!strcmp(dst_type, "IP6")) {
797  s.src_addr = "::1";
798  s.src_type = "IP6";
799  }
800  }
801  }
802  sdp_write_header(buf, size, &s);
803 
804  dst[0] = 0;
805  for (i = 0; i < n_files; i++) {
806  if (n_files != 1) {
807  port = sdp_get_address(dst, sizeof(dst), &ttl, ac[i]->url ? ac[i]->url : "");
808  is_multicast = resolve_destination(dst, sizeof(dst), dst_type,
809  sizeof(dst_type));
810  if (!is_multicast)
811  ttl = 0;
812  }
813  for (j = 0; j < ac[i]->nb_streams; j++) {
814  ff_sdp_write_media(buf, size, ac[i]->streams[j], index++,
815  dst[0] ? dst : NULL, dst_type,
816  (port > 0) ? port + j * 2 : 0,
817  ttl, ac[i]);
818  if (port <= 0) {
819  av_strlcatf(buf, size,
820  "a=control:streamid=%d\r\n", i + j);
821  }
822  if (ac[i]->pb && ac[i]->pb->av_class) {
823  uint8_t *crypto_suite = NULL, *crypto_params = NULL;
824  av_opt_get(ac[i]->pb, "srtp_out_suite", AV_OPT_SEARCH_CHILDREN,
825  &crypto_suite);
826  av_opt_get(ac[i]->pb, "srtp_out_params", AV_OPT_SEARCH_CHILDREN,
827  &crypto_params);
828  if (crypto_suite && crypto_suite[0])
829  av_strlcatf(buf, size,
830  "a=crypto:1 %s inline:%s\r\n",
831  crypto_suite, crypto_params);
832  av_free(crypto_suite);
833  av_free(crypto_params);
834  }
835  }
836  }
837 
838  return 0;
839 }
840 #else
841 int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
842 {
843  return AVERROR(ENOSYS);
844 }
845 
846 void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx,
847  const char *dest_addr, const char *dest_type,
848  int port, int ttl, AVFormatContext *fmt)
849 {
850 }
851 #endif
const char * name
Definition: avisynth_c.h:775
void av_url_split(char *proto, int proto_size, char *authorization, int authorization_size, char *hostname, int hostname_size, int *port_ptr, char *path, int path_size, const char *url)
Split a URL string into components.
Definition: utils.c:4691
internal header for HEVC (de)muxer utilities
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
Bytestream IO Context.
Definition: avio.h:161
static enum AVPixelFormat pix_fmt
int size
const uint8_t * ff_avc_find_startcode(const uint8_t *p, const uint8_t *end)
Definition: avc.c:65
int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
Return the written size and a pointer to the buffer.
Definition: aviobuf.c:1420
const char * fmt
Definition: avisynth_c.h:769
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:67
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3884
int version
Definition: avisynth_c.h:766
#define freeaddrinfo
Definition: network.h:215
int avio_open_dyn_buf(AVIOContext **s)
Open a write only memory stream.
Definition: aviobuf.c:1391
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3876
Format I/O context.
Definition: avformat.h:1342
#define RTP_PT_PRIVATE
Definition: rtp.h:77
Public dictionary API.
static int64_t start_time
Definition: ffplay.c:327
uint8_t
#define av_malloc(s)
int width
Video only.
Definition: avcodec.h:3950
AVOptions.
const AVClass * av_class
A class for private options.
Definition: avio.h:174
int ff_avc_write_annexb_extradata(const uint8_t *in, uint8_t **buf, int *size)
Definition: avc.c:197
AVDictionaryEntry * av_dict_get(const AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
Get a dictionary entry with matching key.
Definition: dict.c:40
int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
Generate an SDP for an RTP session.
Definition: sdp.c:841
int av_find_info_tag(char *arg, int arg_size, const char *tag1, const char *info)
Attempt to find a specific tag in a URL.
Definition: parseutils.c:743
#define av_log(a,...)
#define AV_OPT_FLAG_ENCODING_PARAM
a generic parameter which can be set by the user for muxing or encoding
Definition: opt.h:276
struct AVOutputFormat * oformat
The output container format.
Definition: avformat.h:1361
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3913
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define PTRDIFF_SPECIFIER
Definition: internal.h:261
#define AV_RB16
Definition: intreadwrite.h:53
#define AVERROR(e)
Definition: error.h:43
const char * r
Definition: vf_curves.c:111
int ff_isom_write_hvcc(AVIOContext *pb, const uint8_t *data, int size, int ps_array_completeness)
Writes HEVC extradata (parameter sets, declarative SEI NAL units) to the provided AVIOContext...
Definition: hevc.c:1096
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3880
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
char * av_base64_encode(char *out, int out_size, const uint8_t *in, int in_size)
Encode data to base64 and null-terminate.
Definition: base64.c:138
int ff_is_multicast_address(struct sockaddr *addr)
Definition: network.c:144
size_t av_strlcpy(char *dst, const char *src, size_t size)
Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.
Definition: avstring.c:83
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3902
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:66
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1398
#define NI_NUMERICHOST
Definition: network.h:192
int block_align
Audio only.
Definition: avcodec.h:4001
#define AV_CODEC_FLAG_QSCALE
Use fixed qscale.
Definition: avcodec.h:833
#define AV_BASE64_SIZE(x)
Calculate the output size needed to base64-encode x bytes to a null-terminated string.
Definition: base64.h:66
#define AV_OPT_SEARCH_CHILDREN
Search in possible children of the given object first.
Definition: opt.h:555
int avpriv_split_xiph_headers(const uint8_t *extradata, int extradata_size, int first_header_size, const uint8_t *header_start[3], int header_len[3])
Split a single extradata buffer into the three headers that most Xiph codecs use. ...
Definition: xiph.c:24
const AVClass * priv_class
AVClass for the private context.
Definition: avformat.h:535
Stream structure.
Definition: avformat.h:873
int av_opt_get_int(void *obj, const char *name, int search_flags, int64_t *out_val)
Definition: opt.c:875
#define MAX_EXTRADATA_SIZE
Definition: latmenc.c:31
void * buf
Definition: avisynth_c.h:690
#define AV_STRINGIFY(s)
Definition: macros.h:36
int index
Definition: gxfenc.c:89
cl_device_type type
size_t av_strlcatf(char *dst, size_t size, const char *fmt,...)
Definition: avstring.c:101
static int FUNC() sps(CodedBitstreamContext *ctx, RWContext *rw, H264RawSPS *current)
misc parsing utilities
size_t av_strlcat(char *dst, const char *src, size_t size)
Append the string src to the string dst, but to a total length of no more than size - 1 bytes...
Definition: avstring.c:93
#define LIBAVFORMAT_VERSION
Definition: version.h:41
#define RTP_XIPH_IDENT
Definition: rtp.h:89
const int avpriv_mpeg4audio_sample_rates[16]
Definition: mpeg4audio.c:62
int sample_rate
Audio only.
Definition: avcodec.h:3994
#define getaddrinfo
Definition: network.h:214
Main libavformat public API header.
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:62
#define getnameinfo
Definition: network.h:216
int av_opt_get(void *obj, const char *name, int search_flags, uint8_t **out_val)
Definition: opt.c:751
#define av_free(p)
char * value
Definition: dict.h:87
int len
int ff_rtp_get_payload_type(AVFormatContext *fmt, AVCodecParameters *par, int idx)
Return the payload type for a given stream used in the given format context.
Definition: rtp.c:90
void * priv_data
Format private data.
Definition: avformat.h:1370
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:3926
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3898
int channels
Audio only.
Definition: avcodec.h:3990
int av_opt_flag_is_set(void *obj, const char *field_name, const char *flag_name)
Check whether a particular flag is set in a flags field.
Definition: opt.c:1011
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1020
void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx, const char *dest_addr, const char *dest_type, int port, int ttl, AVFormatContext *fmt)
Append the media-specific SDP fragment for the media stream c to the buffer buff. ...
Definition: sdp.c:846
enum AVCodecID id
char * ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase)
Definition: utils.c:4762
mode
Use these values in ebur128_init (or&#39;ed).
Definition: ebur128.h:83