src/api/sipe-core.h

   1 /**
   2  * @file sipe-core.h
   3  *
   4  * pidgin-sipe
   5  *
   6  * Copyright (C) 2010-2017 SIPE Project <http://sipe.sourceforge.net/>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 /**
  24  *
  25  * Backend -> SIPE Core API - functions called by backend code
  26  *
  27  ***************** !!! IMPORTANT NOTE FOR BACKEND CODERS !!! *****************
  28  *
  29  *            The SIPE core assumes atomicity and is *NOT* thread-safe.
  30  *
  31  * It *does not* protect any of its data structures or code paths with locks!
  32  *
  33  * In no circumstances it must be interrupted by another thread calling
  34  * sipe_core_xxx() while the first thread has entered the SIPE core through
  35  * a sipe_core_xxx() function.
  36  *
  37  ***************** !!! IMPORTANT NOTE FOR BACKEND CODERS !!! *****************
  38  */
  39
  40 #ifdef __cplusplus
  41 extern "C" {
  42 #endif
  43
  44 /**
  45  * Transport type
  46  */
  47 #define SIPE_TRANSPORT_AUTO 0
  48 #define SIPE_TRANSPORT_TLS  1
  49 #define SIPE_TRANSPORT_TCP  2
  50
  51 /**
  52  * Transport connection (public part)
  53  *
  54  * The receiver in the backend fills "buffer". The backend has to zero
  55  * terminate the buffer before calling the processing function in the core.
  56  *
  57  * The processing function in the core can remove content from the buffer.
  58  * It has to update buffer_used accordingly.
  59  *
  60  */
  61 struct sipe_transport_connection {
  62         gpointer user_data;
  63         gchar *buffer;
  64         gsize buffer_used;        /* 0 < buffer_used < buffer_length */
  65         gsize buffer_length;      /* read-only */
  66         guint type;               /* read-only */
  67         guint client_port;        /* read-only */
  68 };
  69
  70 /**
  71  * Opaque data type for chat session
  72  */
  73 struct sipe_chat_session;
  74
  75 /**
  76  * File transport (public part)
  77  */
  78 struct sipe_file_transfer {
  79         struct sipe_backend_file_transfer *backend_private;
  80
  81         void (* ft_init)(struct sipe_file_transfer *ft, const gchar *filename,
  82                          gsize size, const gchar *who);
  83         void (* ft_start)(struct sipe_file_transfer *ft, gsize total_size);
  84         gssize (* ft_read)(struct sipe_file_transfer *ft, guchar **buffer,
  85                            gsize bytes_remaining, gsize bytes_available);
  86         gssize (* ft_write)(struct sipe_file_transfer *ft, const guchar *buffer,
  87                             gsize size);
  88         gboolean (* ft_end)(struct sipe_file_transfer *ft);
  89         void (* ft_request_denied)(struct sipe_file_transfer *ft);
  90         void (* ft_cancelled)(struct sipe_file_transfer *ft);
  91 };
  92
  93 /**
  94  * Opaque data type for backend private data.
  95  * The backend is responsible to allocate and free it.
  96  */
  97 struct sipe_backend_private;
  98
  99 /**
 100  * SIP transport authentication scheme
 101  */
 102 #define SIPE_AUTHENTICATION_TYPE_UNSET     0
 103 #define SIPE_AUTHENTICATION_TYPE_BASIC     1 /* internal use only */
 104 #define SIPE_AUTHENTICATION_TYPE_NTLM      2
 105 #define SIPE_AUTHENTICATION_TYPE_KERBEROS  3
 106 #define SIPE_AUTHENTICATION_TYPE_NEGOTIATE 4 /* internal use only */
 107 #define SIPE_AUTHENTICATION_TYPE_TLS_DSK   5
 108 #define SIPE_AUTHENTICATION_TYPE_AUTOMATIC 6 /* always last */
 109
 110 /**
 111  * Flags
 112  */
 113 /* user disabled calendar information publishing */
 114 #define SIPE_CORE_FLAG_DONT_PUBLISH 0x00000001
 115
 116 #define SIPE_CORE_FLAG_IS(flag)    \
 117         ((sipe_public->flags & SIPE_CORE_FLAG_ ## flag) == SIPE_CORE_FLAG_ ## flag)
 118 #define SIPE_CORE_FLAG_SET(flag)   \
 119         (sipe_public->flags |= SIPE_CORE_FLAG_ ## flag)
 120 #define SIPE_CORE_FLAG_UNSET(flag) \
 121         (sipe_public->flags &= ~SIPE_CORE_FLAG_ ## flag)
 122
 123 /**
 124  * Byte length of cryptographic key for call encryption.
 125  */
 126 #define SIPE_SRTP_KEY_LEN 30
 127
 128 /**
 129  * Public part of the Sipe data structure
 130  *
 131  * This part contains the information needed by the core and the backend.
 132  */
 133 struct sipe_core_public {
 134         /**
 135          * This points to the private data for the backend.
 136          * The backend is responsible to allocate and free it.
 137          */
 138         struct sipe_backend_private *backend_private;
 139
 140         /* flags (see above) */
 141         guint32 flags;
 142
 143         /* user information */
 144         gchar *sip_name;
 145         gchar *sip_domain;
 146
 147         /* server information */
 148         /* currently nothing */
 149 };
 150
 151 /**
 152  * Initialize & destroy functions for the SIPE core
 153  * Should be called on loading and unloading of the plugin.
 154  */
 155 void sipe_core_init(const char *locale_dir);
 156 void sipe_core_destroy(void);
 157
 158 /** Utility functions exported by the core to backends ***********************/
 159 gboolean sipe_strequal(const gchar *left, const gchar *right);
 160 gboolean sipe_strcase_equal(const gchar *left, const gchar *right);
 161
 162 GSList *
 163 sipe_utils_nameval_add(GSList *list, const gchar *name, const gchar *value);
 164
 165 const gchar *
 166 sipe_utils_nameval_find(const GSList *list, const gchar *name);
 167
 168 const gchar *
 169 sipe_utils_nameval_find_instance(const GSList *list, const gchar *name, int which);
 170
 171 void
 172 sipe_utils_nameval_free(GSList *list);
 173
 174 gchar *sip_uri_from_name(const gchar *name);
 175 gchar *sip_uri_if_valid(const gchar *string);
 176
 177 /*****************************************************************************/
 178
 179 /**
 180  * Other functions (need to be sorted once structure becomes clear.
 181  */
 182
 183 /* Get translated about string. Must be g_free'd(). */
 184 gchar *sipe_core_about(void);
 185
 186 /* Execute a scheduled action */
 187 void sipe_core_schedule_execute(gpointer data);
 188
 189 /* menu actions */
 190 void sipe_core_update_calendar(struct sipe_core_public *sipe_public);
 191 void sipe_core_reset_status(struct sipe_core_public *sipe_public);
 192
 193 /* access levels */
 194 void sipe_core_change_access_level_from_container(struct sipe_core_public *sipe_public,
 195                                                   gpointer parameter);
 196 void sipe_core_change_access_level_for_domain(struct sipe_core_public *sipe_public,
 197                                               const gchar *domain,
 198                                               guint index);
 199
 200 /**
 201  * Activity
 202  *   - core:    maps this to OCS protocol values
 203  *              maps this to translated descriptions
 204  *   - backend: maps this to backend status values
 205  *              backend token string can be used as "ID" in protocol
 206  *
 207  * This is passed back-and-forth and therefore defined as list, not as enum.
 208  * Can be used as array index
 209  */
 210 #define SIPE_ACTIVITY_UNSET        0
 211 #define SIPE_ACTIVITY_AVAILABLE    1
 212 #define SIPE_ACTIVITY_ONLINE       2
 213 #define SIPE_ACTIVITY_INACTIVE     3
 214 #define SIPE_ACTIVITY_BUSY         4
 215 #define SIPE_ACTIVITY_BUSYIDLE     5
 216 #define SIPE_ACTIVITY_DND          6
 217 #define SIPE_ACTIVITY_BRB          7
 218 #define SIPE_ACTIVITY_AWAY         8
 219 #define SIPE_ACTIVITY_LUNCH        9
 220 #define SIPE_ACTIVITY_INVISIBLE   10
 221 #define SIPE_ACTIVITY_OFFLINE     11
 222 #define SIPE_ACTIVITY_ON_PHONE    12
 223 #define SIPE_ACTIVITY_IN_CONF     13
 224 #define SIPE_ACTIVITY_IN_MEETING  14
 225 #define SIPE_ACTIVITY_OOF         15
 226 #define SIPE_ACTIVITY_URGENT_ONLY 16
 227 #define SIPE_ACTIVITY_NUM_TYPES   17 /* use to define array size */
 228
 229 const gchar *sipe_core_activity_description(guint type);
 230
 231 /* buddy actions */
 232 /**
 233  * Get status text for buddy.
 234  *
 235  * @param sipe_public Sipe core public data structure.
 236  * @param uri         SIP URI of the buddy
 237  * @param activity    activity value for buddy
 238  * @param status_text backend-specific buddy status text for activity.
 239  *
 240  * @return HTML status text for the buddy or NULL. Must be g_free()'d.
 241  */
 242 gchar *sipe_core_buddy_status(struct sipe_core_public *sipe_public,
 243                               const gchar *uri,
 244                               guint activity,
 245                               const gchar *status_text);
 246
 247 void sipe_core_buddy_got_status(struct sipe_core_public *sipe_public,
 248                                 const gchar *uri,
 249                                 guint activity);
 250
 251 /**
 252  * Trigger generation of buddy information label/text pairs
 253  *
 254  * @param sipe_public Sipe core public data structure.
 255  * @param uri         SIP URI of the buddy
 256  * @param status_text backend-specific buddy status text for ID.
 257  * @param is_online   backend considers buddy to be online.
 258  * @param tooltip     opaque backend identifier for tooltip info. This is the
 259  *                    parameter given to @c sipe_backend_buddy_tooltip_add()
 260  */
 261 struct sipe_backend_buddy_tooltip;
 262 void sipe_core_buddy_tooltip_info(struct sipe_core_public *sipe_public,
 263                                   const gchar *uri,
 264                                   const gchar *status_name,
 265                                   gboolean is_online,
 266                                   struct sipe_backend_buddy_tooltip *tooltip);
 267
 268 /**
 269  * Add a buddy
 270  *
 271  * @param sipe_public Sipe core public data structure
 272  * @param uri         SIP URI of the buddy
 273  * @param group_name  backend-specific group name
 274  */
 275 void sipe_core_buddy_add(struct sipe_core_public *sipe_public,
 276                          const gchar *uri,
 277                          const gchar *group_name);
 278
 279 /**
 280  * Remove a buddy
 281  *
 282  * @param sipe_public Sipe core public data structure
 283  * @param uri         SIP URI of the buddy
 284  * @param group_name  backend-specific group name
 285  */
 286 void sipe_core_buddy_remove(struct sipe_core_public *sipe_public,
 287                             const gchar *uri,
 288                             const gchar *group_name);
 289
 290 void sipe_core_contact_allow_deny(struct sipe_core_public *sipe_public,
 291                                   const gchar *who,
 292                                   gboolean allow);
 293 void sipe_core_group_set_alias(struct sipe_core_public *sipe_public,
 294                                const gchar *who,
 295                                const gchar *alias);
 296
 297 /**
 298  * Setup core data
 299  */
 300 struct sipe_core_public *sipe_core_allocate(const gchar *signin_name,
 301                                             gboolean sso,
 302                                             const gchar *login_account,
 303                                             const gchar *password,
 304                                             const gchar *email,
 305                                             const gchar *email_url,
 306                                             const gchar **errmsg);
 307 void sipe_core_deallocate(struct sipe_core_public *sipe_public);
 308
 309 /**
 310  * Check if SIP authentication scheme requires a password
 311  *
 312  * NOTE: this can be called *BEFORE* @c sipe_core_allocate()!
 313  *
 314  * @param authentication SIP transport authentication type
 315  * @param sso            TRUE if user selected Single-Sign On
 316  *
 317  * @return TRUE if password is required
 318  */
 319 gboolean sipe_core_transport_sip_requires_password(guint authentication,
 320                                                    gboolean sso);
 321
 322 /**
 323  * Connect to SIP server
 324  */
 325 void sipe_core_transport_sip_connect(struct sipe_core_public *sipe_public,
 326                                      guint transport,
 327                                      guint authentication,
 328                                      const gchar *server,
 329                                      const gchar *port);
 330
 331 /**
 332  * Get SIP server host name
 333  *
 334  * @param sipe_public Sipe core public data structure
 335  *
 336  * @return server host name (may be @c NULL if not fully connected yet)
 337  */
 338 const gchar *sipe_core_transport_sip_server_name(struct sipe_core_public *sipe_public);
 339
 340 /**
 341  * Get chat ID, f.ex. group chat URI
 342  */
 343 const gchar *sipe_core_chat_id(struct sipe_core_public *sipe_public,
 344                                struct sipe_chat_session *chat_session);
 345
 346 /**
 347  * Get type of chat session, e.g. group chat
 348  */
 349 #define SIPE_CHAT_TYPE_UNKNOWN    0
 350 #define SIPE_CHAT_TYPE_MULTIPARTY 1
 351 #define SIPE_CHAT_TYPE_CONFERENCE 2
 352 #define SIPE_CHAT_TYPE_GROUPCHAT  3
 353 guint sipe_core_chat_type(struct sipe_chat_session *chat_session);
 354
 355 /**
 356  * Invite to chat
 357  */
 358 void sipe_core_chat_invite(struct sipe_core_public *sipe_public,
 359                            struct sipe_chat_session *chat_session,
 360                            const char *name);
 361
 362 /**
 363  * Rejoin a chat after connection re-establishment
 364  */
 365 void sipe_core_chat_rejoin(struct sipe_core_public *sipe_public,
 366                            struct sipe_chat_session *chat_session);
 367
 368 /**
 369  * Leave a chat
 370  */
 371 void sipe_core_chat_leave(struct sipe_core_public *sipe_public,
 372                           struct sipe_chat_session *chat_session);
 373
 374 /**
 375  * Send message to chat
 376  */
 377 void sipe_core_chat_send(struct sipe_core_public *sipe_public,
 378                          struct sipe_chat_session *chat_session,
 379                          const char *what);
 380
 381 /**
 382  * Check chat lock status
 383  */
 384 typedef enum {
 385         SIPE_CHAT_LOCK_STATUS_NOT_ALLOWED = 0,
 386         SIPE_CHAT_LOCK_STATUS_UNLOCKED,
 387         SIPE_CHAT_LOCK_STATUS_LOCKED
 388 } sipe_chat_lock_status;
 389 sipe_chat_lock_status sipe_core_chat_lock_status(struct sipe_core_public *sipe_public,
 390                                                  struct sipe_chat_session *chat_session);
 391
 392 /**
 393  * Lock chat
 394  */
 395 void sipe_core_chat_modify_lock(struct sipe_core_public *sipe_public,
 396                                 struct sipe_chat_session *chat_session,
 397                                 const gboolean locked);
 398
 399 /**
 400  * Create new session with Focus URI
 401  *
 402  * @param sipe_public (in) SIPE core data.
 403  * @param focus_uri (in) focus URI string
 404  */
 405 void sipe_core_conf_create(struct sipe_core_public *sipe_public,
 406                            const gchar *focus_uri,
 407                            const gchar *organizer,
 408                            const gchar *meeting_id);
 409
 410 /* buddy menu callback: parameter == chat_session */
 411 void sipe_core_conf_make_leader(struct sipe_core_public *sipe_public,
 412                                 gpointer parameter,
 413                                 const gchar *buddy_name);
 414 void sipe_core_conf_remove_from(struct sipe_core_public *sipe_public,
 415                                 gpointer parameter,
 416                                 const gchar *buddy_name);
 417
 418 gchar *
 419 sipe_core_conf_entry_info(struct sipe_core_public *sipe_public,
 420                           struct sipe_chat_session *chat_session);
 421
 422 /**
 423  * Checks if given chat session has an open RDP client window.
 424  *
 425  * @param sipe_public (in) SIPE core data.
 426  * @param chat_session (in) chat session structure
 427  *
 428  * @return @c TRUE if RDP session is in progress.
 429  */
 430 gboolean
 431 sipe_core_conf_is_viewing_appshare(struct sipe_core_public *sipe_public,
 432                                    struct sipe_chat_session *chat_session);
 433
 434 /* call control (CSTA) */
 435 void sipe_core_buddy_make_call(struct sipe_core_public *sipe_public,
 436                                const gchar *phone);
 437
 438 /* media */
 439 void sipe_core_media_initiate_call(struct sipe_core_public *sipe_public,
 440                                    const char *participant,
 441                                    gboolean with_video);
 442 struct sipe_media_call;
 443 struct sipe_media_stream *
 444 sipe_core_media_get_stream_by_id(struct sipe_media_call *call, const gchar *id);
 445
 446 /**
 447  * Called by media backend after a candidate pair for a media stream component
 448  * has been established.
 449  *
 450  * @param stream (in) SIPE media stream data.
 451  */
 452 void
 453 sipe_core_media_stream_candidate_pair_established(struct sipe_media_stream *stream);
 454
 455 void
 456 sipe_core_media_stream_readable(struct sipe_media_stream *stream);
 457
 458 /**
 459  * Called by media backend when a @c SIPE_MEDIA_APPLICATION stream changes its
 460  * state between writable and unwritable.
 461  *
 462  * @param stream (in) SIPE media stream data.
 463  * @param writable (in) @c TRUE if stream has become writable, otherwise
 464  *                 @c FALSE.
 465  */
 466 void
 467 sipe_core_media_stream_writable(struct sipe_media_stream *stream,
 468                                 gboolean writable);
 469
 470 /**
 471  * Called by media backend when @c stream has ended and should be destroyed.
 472  *
 473  * @param stream (in) SIPE media stream data.
 474  */
 475 void
 476 sipe_core_media_stream_end(struct sipe_media_stream *stream);
 477
 478 /**
 479  * Connects to a conference call specified by given chat session
 480  *
 481  * @param sipe_public (in) SIPE core data.
 482  * @param chat_session (in) chat session structure
 483  */
 484 void sipe_core_media_connect_conference(struct sipe_core_public *sipe_public,
 485                                         struct sipe_chat_session *chat_session);
 486
 487 /**
 488  * Retrieves the media call in progress
 489  *
 490  * The function checks only for voice and video calls, ignoring other types of
 491  * data transfers.
 492  *
 493  * @param sipe_public (in) SIPE core data.
 494  *
 495  * @return @c sipe_media_call structure or @c NULL if call is not in progress.
 496  */
 497 struct sipe_media_call *
 498 sipe_core_media_get_call(struct sipe_core_public *sipe_public);
 499
 500 /**
 501  * Initiates a call with given phone number
 502  *
 503  * @param sipe_public (in) SIPE core data.
 504  * @parem phone_number (in) a mobile or landline phone number, i.e. +46123456
 505  */
 506 void sipe_core_media_phone_call(struct sipe_core_public *sipe_public,
 507                                 const gchar *phone_number);
 508
 509 /**
 510  * Checks voice quality by making a call to the test service
 511  *
 512  * @param sipe_public (in) SIPE core data.
 513  */
 514 void sipe_core_media_test_call(struct sipe_core_public *sipe_public);
 515
 516 /* file transfer */
 517 struct sipe_file_transfer *
 518 sipe_core_ft_create_outgoing(struct sipe_core_public *sipe_public,
 519                              const gchar *who,
 520                              const gchar *file);
 521
 522 /* application sharing */
 523
 524 /**
 525  * Connects to a meeting's presentation
 526  *
 527  * @param sipe_public (in) SIPE core data.
 528  * @param chat_session (in) chat session structure
 529  * @param user_must_accept (in) @c TRUE if user should be shown accept/decline
 530  *                         dialog before the action can proceed.
 531  */
 532 void sipe_core_appshare_connect_conference(struct sipe_core_public *sipe_public,
 533                                            struct sipe_chat_session *chat_session,
 534                                            gboolean user_must_accept);
 535
 536 /* group chat */
 537 gboolean sipe_core_groupchat_query_rooms(struct sipe_core_public *sipe_public);
 538 void sipe_core_groupchat_join(struct sipe_core_public *sipe_public,
 539                               const gchar *uri);
 540
 541 /* IM */
 542 void sipe_core_im_send(struct sipe_core_public *sipe_public,
 543                        const gchar *who,
 544                        const gchar *what);
 545 void sipe_core_im_close(struct sipe_core_public *sipe_public,
 546                         const gchar *who);
 547
 548 /* user */
 549 void sipe_core_user_feedback_typing(struct sipe_core_public *sipe_public,
 550                                     const gchar *to,
 551                                     gboolean typing);
 552
 553 void sipe_core_user_ask_cb(gpointer key, gboolean accepted);
 554
 555 /* groups */
 556 void sipe_core_group_rename(struct sipe_core_public *sipe_public,
 557                             const gchar *old_name,
 558                             const gchar *new_name);
 559
 560 void sipe_core_group_remove(struct sipe_core_public *sipe_public,
 561                             const gchar *name);
 562
 563 /* buddies */
 564 void sipe_core_buddy_group(struct sipe_core_public *sipe_public,
 565                            const gchar *who,
 566                            const gchar *old_group_name,
 567                            const gchar *new_group_name);
 568
 569 struct sipe_backend_search_token;
 570 void sipe_core_buddy_search(struct sipe_core_public *sipe_public,
 571                             struct sipe_backend_search_token *token,
 572                             const gchar *given_name,
 573                             const gchar *surname,
 574                             const gchar *email,
 575                             const gchar *sipid,
 576                             const gchar *company,
 577                             const gchar *country);
 578
 579 void sipe_core_buddy_get_info(struct sipe_core_public *sipe_public,
 580                               const gchar *who);
 581
 582 void sipe_core_buddy_new_chat(struct sipe_core_public *sipe_public,
 583                               const gchar *who);
 584 void sipe_core_buddy_send_email(struct sipe_core_public *sipe_public,
 585                                 const gchar *who);
 586
 587 struct sipe_backend_buddy_menu;
 588 struct sipe_backend_buddy_menu *sipe_core_buddy_create_menu(struct sipe_core_public *sipe_public,
 589                                                             const gchar *buddy_name,
 590                                                             struct sipe_backend_buddy_menu *menu);
 591
 592 void sipe_core_buddy_menu_free(struct sipe_core_public *sipe_public);
 593
 594 /**
 595  * User/Machine has changed the user status
 596  *
 597  * NOTE: must *NEVER* be triggered by @c sipe_backend_status_and_note()!
 598  *
 599  * @param sipe_public   The handle representing the protocol instance
 600  * @param set_by_user   @c TRUE if status has been changed by user
 601  * @param activity      New activity
 602  * @param message       New note text
 603  */
 604 void sipe_core_status_set(struct sipe_core_public *sipe_public,
 605                           gboolean set_by_user,
 606                           guint activity,
 607                           const gchar *note);
 608
 609 #define SIPE_MSRTP_VSR_HEADER_LEN  20
 610 #define SIPE_MSRTP_VSR_ENTRY_LEN   0x44
 611 #define SIPE_MSRTP_VSR_FCI_WORDLEN \
 612         (SIPE_MSRTP_VSR_HEADER_LEN + SIPE_MSRTP_VSR_ENTRY_LEN) / 4
 613
 614 #define SIPE_MSRTP_VSR_SOURCE_ANY  0xFFFFFFFE
 615 #define SIPE_MSRTP_VSR_SOURCE_NONE 0xFFFFFFFF
 616
 617 /**
 618  * Fills @buffer with Video Source Request described in [MS-RTP] 2.2.12.2.
 619  *
 620  * @param buffer (out) destination the VSR will be written to. The byte length
 621  *               of @c buffer MUST be at least @c SIPE_MSRTP_VSR_HEADER_LEN +
 622  *               @c SIPE_MSRTP_VSR_ENTRY_LEN.
 623  * @param payload_type (in) payload ID of the codec negotiated with the peer.
 624  */
 625 void sipe_core_msrtp_write_video_source_request(guint8 *buffer,
 626                                                 guint8 payload_type);
 627
 628 /**
 629  * Fills @buffer with customized Payload Content Scalability Information packet
 630  * described in [MS-H264PF] consisting of a Stream Layout SEI Message (section
 631  * 2.2.5) and a Bitstream Info SEI Message (section 2.2.7).
 632  *
 633  * @param buffer (out) destination the PACSI will be written to.
 634  * @param nal_count (in) number of NAL units this packet describes.
 635  *
 636  * @return Byte length of the PACSI packet.
 637  */
 638 gsize sipe_core_msrtp_write_video_scalability_info(guint8 *buffer,
 639                                                    guint8 nal_count);
 640
 641 #ifdef __cplusplus
 642 }
 643 #endif
 644
 645 /*
 646   Local Variables:
 647   mode: c
 648   c-file-style: "bsd"
 649   indent-tabs-mode: t
 650   tab-width: 8
 651   End:
 652 */