src/mac/carbon/mediactrl.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        mac/carbon/mediactrl.cpp
   3 // Purpose:     Built-in Media Backends for Mac
   4 // Author:      Ryan Norton <wxprojects@comcast.net>
   5 // Modified by:
   6 // Created:     11/07/04
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2004-2005 Ryan Norton, portions (c) 2004 Kevin Olliver
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 //===========================================================================
  13 //  DECLARATIONS
  14 //===========================================================================
  15
  16 //---------------------------------------------------------------------------
  17 // Pre-compiled header stuff
  18 //---------------------------------------------------------------------------
  19
  20 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  21 #pragma implementation "mediactrl.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28 #pragma hdrstop
  29 #endif
  30
  31 //---------------------------------------------------------------------------
  32 // Includes
  33 //---------------------------------------------------------------------------
  34 #include "wx/mediactrl.h"
  35
  36 //---------------------------------------------------------------------------
  37 // Compilation guard
  38 //---------------------------------------------------------------------------
  39 #if wxUSE_MEDIACTRL
  40
  41 //---------------------------------------------------------------------------
  42 // Whether or not to use OSX 10.2's CreateMovieControl for native QuickTime
  43 // control - i.e. native positioning and event handling etc..
  44 //---------------------------------------------------------------------------
  45 #ifndef wxUSE_CREATEMOVIECONTROL
  46 #    if defined( __WXMAC_OSX__ ) && ( MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_2 )
  47 #        define wxUSE_CREATEMOVIECONTROL 1
  48 #    else
  49 #        define wxUSE_CREATEMOVIECONTROL 0
  50 #    endif
  51 #endif
  52
  53 //===========================================================================
  54 //  BACKEND DECLARATIONS
  55 //===========================================================================
  56
  57 //---------------------------------------------------------------------------
  58 //
  59 //  wxQTMediaBackend
  60 //
  61 //---------------------------------------------------------------------------
  62
  63 //---------------------------------------------------------------------------
  64 //  QT Includes
  65 //---------------------------------------------------------------------------
  66 //uma is for wxMacFSSpec
  67 #include "wx/mac/uma.h"
  68 #include "wx/timer.h"
  69 #include <Movies.h>
  70 #include <Gestalt.h>
  71 #include <QuickTimeComponents.h>    //Standard QT stuff
  72
  73 //Determines whether version 4 of QT is installed (Pretty much for classic only)
  74 Boolean _wxIsQuickTime4Installed (void)
  75 {
  76     short error;
  77     long result;
  78
  79     error = Gestalt (gestaltQuickTime, &result);
  80     return (error == noErr) && (((result >> 16) & 0xffff) >= 0x0400);
  81 }
  82
  83 class WXDLLIMPEXP_MEDIA wxQTMediaBackend : public wxMediaBackend
  84 {
  85 public:
  86
  87     wxQTMediaBackend();
  88     ~wxQTMediaBackend();
  89
  90     virtual bool CreateControl(wxControl* ctrl, wxWindow* parent,
  91                                      wxWindowID id,
  92                                      const wxPoint& pos,
  93                                      const wxSize& size,
  94                                      long style,
  95                                      const wxValidator& validator,
  96                                      const wxString& name);
  97
  98     virtual bool Play();
  99     virtual bool Pause();
 100     virtual bool Stop();
 101
 102     virtual bool Load(const wxString& fileName);
 103     virtual bool Load(const wxURI& location);
 104
 105     virtual wxMediaState GetState();
 106
 107     virtual bool SetPosition(wxLongLong where);
 108     virtual wxLongLong GetPosition();
 109     virtual wxLongLong GetDuration();
 110
 111     virtual void Move(int x, int y, int w, int h);
 112     wxSize GetVideoSize() const;
 113
 114     virtual double GetPlaybackRate();
 115     virtual bool SetPlaybackRate(double dRate);
 116
 117     void Cleanup();
 118     void FinishLoad();
 119
 120     wxSize m_bestSize;              //Original movie size
 121 #ifdef __WXMAC_OSX__
 122     struct MovieType** m_movie;     //QT Movie handle/instance
 123 #else
 124     Movie m_movie ;
 125 #endif
 126     wxControl* m_ctrl;              //Parent control
 127     bool m_bVideo;                  //Whether or not we have video
 128     class _wxQTTimer* m_timer;      //Timer for streaming the movie
 129
 130     DECLARE_DYNAMIC_CLASS(wxQTMediaBackend)
 131 };
 132
 133
 134 //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 135 //
 136 // wxQTMediaBackend
 137 //
 138 //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 139
 140 IMPLEMENT_DYNAMIC_CLASS(wxQTMediaBackend, wxMediaBackend);
 141
 142 //Time between timer calls
 143 #define MOVIE_DELAY 100
 144
 145 // --------------------------------------------------------------------------
 146 //          wxQTTimer - Handle Asyncronous Playing
 147 // --------------------------------------------------------------------------
 148 class _wxQTTimer : public wxTimer
 149 {
 150 public:
 151     _wxQTTimer(Movie movie, wxQTMediaBackend* parent) :
 152         m_movie(movie), m_bPaused(false), m_parent(parent)
 153     {
 154     }
 155
 156     ~_wxQTTimer()
 157     {
 158     }
 159
 160     bool GetPaused() {return m_bPaused;}
 161     void SetPaused(bool bPaused) {m_bPaused = bPaused;}
 162
 163     //-----------------------------------------------------------------------
 164     // _wxQTTimer::Notify
 165     //
 166     // 1) Checks to see if the movie is done, and if not continues
 167     //    streaming the movie
 168     // 2) Sends the wxEVT_MEDIA_STOP event if we have reached the end of
 169     //    the movie.
 170     //-----------------------------------------------------------------------
 171     void Notify()
 172     {
 173         if (!m_bPaused)
 174         {
 175             if(!IsMovieDone(m_movie))
 176                 MoviesTask(m_movie, MOVIE_DELAY);
 177             else
 178             {
 179                 wxMediaEvent theEvent(wxEVT_MEDIA_STOP,
 180                                       m_parent->m_ctrl->GetId());
 181                 m_parent->m_ctrl->ProcessEvent(theEvent);
 182
 183                 if(theEvent.IsAllowed())
 184                 {
 185                     Stop();
 186                     m_parent->Stop();
 187                     wxASSERT(::GetMoviesError() == noErr);
 188
 189                     //send the event to our child
 190                     wxMediaEvent theEvent(wxEVT_MEDIA_FINISHED,
 191                                           m_parent->m_ctrl->GetId());
 192                     m_parent->m_ctrl->ProcessEvent(theEvent);
 193                 }
 194             }
 195         }
 196     }
 197
 198 protected:
 199     Movie m_movie;                  //Our movie instance
 200     bool m_bPaused;                 //Whether we are paused or not
 201     wxQTMediaBackend* m_parent;     //Backend pointer
 202 };
 203
 204 //---------------------------------------------------------------------------
 205 // wxQTMediaBackend Constructor
 206 //
 207 // Sets m_timer to NULL signifying we havn't loaded anything yet
 208 //---------------------------------------------------------------------------
 209 wxQTMediaBackend::wxQTMediaBackend() : m_timer(NULL)
 210 {
 211 }
 212
 213 //---------------------------------------------------------------------------
 214 // wxQTMediaBackend Destructor
 215 //
 216 // 1) Cleans up the QuickTime movie instance
 217 // 2) Decrements the QuickTime reference counter - if this reaches
 218 //    0, QuickTime shuts down
 219 // 3) Decrements the QuickTime Windows Media Layer reference counter -
 220 //    if this reaches 0, QuickTime shuts down the Windows Media Layer
 221 //---------------------------------------------------------------------------
 222 wxQTMediaBackend::~wxQTMediaBackend()
 223 {
 224     if(m_timer)
 225         Cleanup();
 226
 227     //Note that ExitMovies() is not necessary...
 228     ExitMovies();
 229 }
 230
 231 //---------------------------------------------------------------------------
 232 // wxQTMediaBackend::CreateControl
 233 //
 234 // 1) Intializes QuickTime
 235 // 2) Creates the control window
 236 //---------------------------------------------------------------------------
 237 bool wxQTMediaBackend::CreateControl(wxControl* ctrl, wxWindow* parent,
 238                                      wxWindowID id,
 239                                      const wxPoint& pos,
 240                                      const wxSize& size,
 241                                      long style,
 242                                      const wxValidator& validator,
 243                                      const wxString& name)
 244 {
 245     //Don't bother in Native control mode
 246 #if defined( __WXMAC__ ) && TARGET_API_MAC_OSX && ( MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_2 )
 247     if (!_wxIsQuickTime4Installed())
 248         return false;
 249 #endif
 250
 251     EnterMovies();
 252
 253     //
 254     // Create window
 255     // By default wxWindow(s) is created with a border -
 256     // so we need to get rid of those
 257     //
 258     // Since we don't have a child window like most other
 259     // backends, we don't need wxCLIP_CHILDREN
 260     //
 261     if ( !
 262
 263 #if wxUSE_CREATEMOVIECONTROL
 264     ctrl->wxWindow::Create(parent, id, pos, size,
 265                             wxWindow::MacRemoveBordersFromStyle(style),
 266                             name)
 267 #else
 268     ctrl->wxControl::Create(parent, id, pos, size,
 269                             wxWindow::MacRemoveBordersFromStyle(style),
 270                             validator, name)
 271 #endif
 272         )
 273         return false;
 274
 275 #if wxUSE_VALIDATORS
 276         ctrl->SetValidator(validator);
 277 #endif
 278
 279     m_ctrl = ctrl;
 280     return true;
 281 }
 282
 283 //---------------------------------------------------------------------------
 284 // wxQTMediaBackend::Load (file version)
 285 //
 286 // 1) Get an FSSpec from the Windows path name
 287 // 2) Open the movie
 288 // 3) Obtain the movie instance from the movie resource
 289 // 4) Close the movie resource
 290 // 5) Finish loading
 291 //---------------------------------------------------------------------------
 292 bool wxQTMediaBackend::Load(const wxString& fileName)
 293 {
 294     if(m_timer)
 295         Cleanup();
 296
 297     OSErr err = noErr;
 298     short movieResFile;
 299     FSSpec sfFile;
 300
 301     //FIXME:wxMacFilename2FSSpec crashes on empty string -
 302     //does it crash on other strings too and should this
 303     //"fix" be put in the carbon wxSound?
 304     if (fileName.empty())
 305         return false;
 306
 307     wxMacFilename2FSSpec( fileName , &sfFile );
 308
 309     if (OpenMovieFile (&sfFile, &movieResFile, fsRdPerm) != noErr)
 310         return false;
 311
 312     short movieResID = 0;
 313     Str255 movieName;
 314
 315     err = NewMovieFromFile (
 316     &m_movie,
 317     movieResFile,
 318     &movieResID,
 319     movieName,
 320     newMovieActive,
 321     NULL); //wasChanged
 322
 323     CloseMovieFile (movieResFile);
 324
 325     if (err != noErr)
 326         return false;
 327
 328     FinishLoad();
 329
 330     return ::GetMoviesError() == noErr;
 331 }
 332
 333 //---------------------------------------------------------------------------
 334 // wxQTMediaBackend::Load (URL Version)
 335 //
 336 // 1) Build an escaped URI from location
 337 // 2) Create a handle to store the URI string
 338 // 3) Put the URI string inside the handle
 339 // 4) Make a QuickTime URL data ref from the handle with the URI in it
 340 // 5) Clean up the URI string handle
 341 // 6) Do some prerolling
 342 // 7) Finish Loading
 343 //---------------------------------------------------------------------------
 344 bool wxQTMediaBackend::Load(const wxURI& location)
 345 {
 346     if(m_timer)
 347         Cleanup();
 348
 349     wxString theURI = location.BuildURI();
 350
 351     OSErr err = noErr;
 352
 353     Handle theHandle = NewHandleClear(theURI.length() + 1);
 354     wxASSERT(theHandle);
 355
 356     BlockMove(theURI.mb_str(), *theHandle, theURI.length() + 1);
 357
 358     //create the movie from the handle that refers to the URI
 359     err = NewMovieFromDataRef(&m_movie, newMovieActive,
 360                                 NULL, theHandle,
 361                                 URLDataHandlerSubType);
 362
 363     DisposeHandle(theHandle);
 364
 365     if (err != noErr)
 366         return false;
 367
 368     //preroll movie for streaming
 369     //TODO:Async this using threads?
 370     TimeValue timeNow;
 371     Fixed playRate;
 372     timeNow = GetMovieTime(m_movie, NULL);
 373     playRate = GetMoviePreferredRate(m_movie);
 374     PrePrerollMovie(m_movie, timeNow, playRate, NULL, NULL);
 375     PrerollMovie(m_movie, timeNow, playRate);
 376     SetMovieRate(m_movie, playRate);
 377
 378     FinishLoad();
 379
 380     return ::GetMoviesError() == noErr;
 381 }
 382
 383 //---------------------------------------------------------------------------
 384 // wxQTMediaBackend::FinishLoad
 385 //
 386 // 1) Create the movie timer
 387 // 2) Get real size of movie for GetBestSize/sizers
 388 // 3) See if there is video in the movie, and if so then either
 389 //    SetMovieGWorld if < 10.2 or use Native CreateMovieControl
 390 // 4) Set the movie time scale to something usable so that seeking
 391 //    etc.  will work correctly
 392 // 5) Refresh parent window
 393 //---------------------------------------------------------------------------
 394 void wxQTMediaBackend::FinishLoad()
 395 {
 396     m_timer = new _wxQTTimer(m_movie, (wxQTMediaBackend*) this);
 397     wxASSERT(m_timer);
 398
 399     //get the real size of the movie
 400     Rect outRect;
 401     ::GetMovieNaturalBoundsRect (m_movie, &outRect);
 402     wxASSERT(::GetMoviesError() == noErr);
 403
 404     m_bestSize.x = outRect.right - outRect.left;
 405     m_bestSize.y = outRect.bottom - outRect.top;
 406
 407     //reparent movie/*AudioMediaCharacteristic*/
 408     if(GetMovieIndTrackType(m_movie, 1,
 409                             VisualMediaCharacteristic,
 410                             movieTrackCharacteristic |
 411                                 movieTrackEnabledOnly) != NULL)
 412     {
 413 #if wxUSE_CREATEMOVIECONTROL
 414     //
 415     //Native CreateMovieControl QT control (Thanks to Kevin Olliver's
 416     //wxQTMovie for some of this).
 417     //
 418     #define GetControlPeer(whatever) ctrl->m_peer
 419     wxMediaCtrl* ctrl = (wxMediaCtrl*) m_ctrl;
 420         Rect bounds = wxMacGetBoundsForControl(m_ctrl,
 421                                                m_ctrl->GetPosition(),
 422                                                m_ctrl->GetSize());
 423
 424     //Dispose of old control for new one
 425     if (GetControlPeer(m_ctrl) && GetControlPeer(m_ctrl)->Ok() )
 426         GetControlPeer(m_ctrl)->Dispose();
 427
 428     //Options-
 429     //kMovieControlOptionXXX
 430     //HideController - hide the movie controller
 431     //LocateTopLeft - movie is pinned to top left rather than centered in the control
 432     //EnableEditing - Allows programmatic editing and dragn'drop
 433     //HandleEditingHI- Installs event stuff for edit menu - forces EnableEditing also
 434     //SetKeysEnabled - Allows keyboard input
 435     //ManuallyIdled - app handles movie idling rather than internal timer event loop
 436         ::CreateMovieControl(
 437                     (WindowRef)
 438                        ctrl->MacGetTopLevelWindowRef(), //parent
 439                        &bounds,                         //control bounds
 440                        m_movie,                         //movie handle
 441                        kMovieControlOptionHideController
 442                        | kMovieControlOptionLocateTopLeft
 443                        | kMovieControlOptionSetKeysEnabled
 444 //                       | kMovieControlOptionManuallyIdled
 445                        ,                                //flags
 446                        ctrl->m_peer->GetControlRefAddr() );
 447
 448         ::EmbedControl(ctrl->m_peer->GetControlRef(), (ControlRef)ctrl->GetParent()->GetHandle());
 449 #else
 450     //
 451     //"Emulation"
 452     //
 453         SetMovieGWorld(m_movie,
 454                        (CGrafPtr)
 455                        GetWindowPort(
 456                        (WindowRef)
 457                        m_ctrl->MacGetTopLevelWindowRef()
 458                        ),
 459                        nil);
 460 #endif
 461     }
 462
 463     //we want millisecond precision
 464     ::SetMovieTimeScale(m_movie, 1000);
 465     wxASSERT(::GetMoviesError() == noErr);
 466
 467     //
 468     //Here, if the parent of the control has a sizer - we
 469     //tell it to recalculate the size of this control since
 470     //the user opened a separate media file
 471     //
 472     m_ctrl->InvalidateBestSize();
 473     m_ctrl->GetParent()->Layout();
 474     m_ctrl->GetParent()->Refresh();
 475     m_ctrl->GetParent()->Update();
 476 }
 477
 478 //---------------------------------------------------------------------------
 479 // wxQTMediaBackend::Play
 480 //
 481 // 1) Start the QT movie
 482 // 2) Start the movie loading timer
 483 //---------------------------------------------------------------------------
 484 bool wxQTMediaBackend::Play()
 485 {
 486     ::StartMovie(m_movie);
 487     m_timer->SetPaused(false);
 488     m_timer->Start(MOVIE_DELAY, wxTIMER_CONTINUOUS);
 489     return ::GetMoviesError() == noErr;
 490 }
 491
 492 //---------------------------------------------------------------------------
 493 // wxQTMediaBackend::Pause
 494 //
 495 // 1) Stop the movie
 496 // 2) Stop the movie timer
 497 //---------------------------------------------------------------------------
 498 bool wxQTMediaBackend::Pause()
 499 {
 500     ::StopMovie(m_movie);
 501     m_timer->SetPaused(true);
 502     m_timer->Stop();
 503     return ::GetMoviesError() == noErr;
 504 }
 505
 506 //---------------------------------------------------------------------------
 507 // wxQTMediaBackend::Stop
 508 //
 509 // 1) Stop the movie
 510 // 2) Stop the movie timer
 511 // 3) Seek to the beginning of the movie
 512 //---------------------------------------------------------------------------
 513 bool wxQTMediaBackend::Stop()
 514 {
 515     m_timer->SetPaused(false);
 516     m_timer->Stop();
 517
 518     ::StopMovie(m_movie);
 519     if(::GetMoviesError() != noErr)
 520         return false;
 521
 522     ::GoToBeginningOfMovie(m_movie);
 523     return ::GetMoviesError() == noErr;
 524 }
 525
 526 //---------------------------------------------------------------------------
 527 // wxQTMediaBackend::GetPlaybackRate
 528 //
 529 // 1) Get the movie playback rate from ::GetMovieRate
 530 //---------------------------------------------------------------------------
 531 double wxQTMediaBackend::GetPlaybackRate()
 532 {
 533     return ( ((double)::GetMovieRate(m_movie)) / 0x10000);
 534 }
 535
 536 //---------------------------------------------------------------------------
 537 // wxQTMediaBackend::SetPlaybackRate
 538 //
 539 // 1) Convert dRate to Fixed and Set the movie rate through SetMovieRate
 540 //---------------------------------------------------------------------------
 541 bool wxQTMediaBackend::SetPlaybackRate(double dRate)
 542 {
 543     ::SetMovieRate(m_movie, (Fixed) (dRate * 0x10000));
 544     return ::GetMoviesError() == noErr;
 545 }
 546
 547 //---------------------------------------------------------------------------
 548 // wxQTMediaBackend::SetPosition
 549 //
 550 // 1) Create a time record struct (TimeRecord) with appropriate values
 551 // 2) Pass struct to SetMovieTime
 552 //---------------------------------------------------------------------------
 553 bool wxQTMediaBackend::SetPosition(wxLongLong where)
 554 {
 555     TimeRecord theTimeRecord;
 556     memset(&theTimeRecord, 0, sizeof(TimeRecord));
 557     theTimeRecord.value.lo = where.GetValue();
 558     theTimeRecord.scale = ::GetMovieTimeScale(m_movie);
 559     theTimeRecord.base = ::GetMovieTimeBase(m_movie);
 560     ::SetMovieTime(m_movie, &theTimeRecord);
 561
 562     if (::GetMoviesError() != noErr)
 563         return false;
 564
 565     return true;
 566 }
 567
 568 //---------------------------------------------------------------------------
 569 // wxQTMediaBackend::GetPosition
 570 //
 571 // Calls GetMovieTime
 572 //---------------------------------------------------------------------------
 573 wxLongLong wxQTMediaBackend::GetPosition()
 574 {
 575     return ::GetMovieTime(m_movie, NULL);
 576 }
 577
 578 //---------------------------------------------------------------------------
 579 // wxQTMediaBackend::GetDuration
 580 //
 581 // Calls GetMovieDuration
 582 //---------------------------------------------------------------------------
 583 wxLongLong wxQTMediaBackend::GetDuration()
 584 {
 585     return ::GetMovieDuration(m_movie);
 586 }
 587
 588 //---------------------------------------------------------------------------
 589 // wxQTMediaBackend::GetState
 590 //
 591 // Determines the current state - the timer keeps track of whether or not
 592 // we are paused or stopped (if the timer is running we are playing)
 593 //---------------------------------------------------------------------------
 594 wxMediaState wxQTMediaBackend::GetState()
 595 {
 596     if ( !m_timer || (m_timer->IsRunning() == false &&
 597                       m_timer->GetPaused() == false) )
 598         return wxMEDIASTATE_STOPPED;
 599
 600     if( m_timer->IsRunning() )
 601         return wxMEDIASTATE_PLAYING;
 602     else
 603         return wxMEDIASTATE_PAUSED;
 604 }
 605
 606 //---------------------------------------------------------------------------
 607 // wxQTMediaBackend::Cleanup
 608 //
 609 // Diposes of the movie timer, Control if native, and stops and disposes
 610 // of the QT movie
 611 //---------------------------------------------------------------------------
 612 void wxQTMediaBackend::Cleanup()
 613 {
 614     delete m_timer;
 615     m_timer = NULL;
 616
 617 #if wxUSE_CREATEMOVIECONTROL
 618     DisposeControl(((wxMediaCtrl*)m_ctrl)->m_peer->GetControlRef());
 619 #endif
 620
 621     StopMovie(m_movie);
 622     DisposeMovie(m_movie);
 623 }
 624
 625 //---------------------------------------------------------------------------
 626 // wxQTMediaBackend::GetVideoSize
 627 //
 628 // Returns the actual size of the QT movie
 629 //---------------------------------------------------------------------------
 630 wxSize wxQTMediaBackend::GetVideoSize() const
 631 {
 632     return m_bestSize;
 633 }
 634
 635 //---------------------------------------------------------------------------
 636 // wxQTMediaBackend::Move
 637 //
 638 // We need to do this even when using native qt control because
 639 // CreateMovieControl is broken in this regard...
 640 //---------------------------------------------------------------------------
 641 void wxQTMediaBackend::Move(int x, int y, int w, int h)
 642 {
 643 #if !wxUSE_CREATEMOVIECONTROL
 644     if(m_timer)
 645     {
 646         if ( m_ctrl )
 647         {
 648             m_ctrl->GetParent()->MacWindowToRootWindow(&x, &y);
 649         }
 650
 651         Rect theRect = {y, x, y+h, x+w};
 652
 653         ::SetMovieBox(m_movie, &theRect);
 654         wxASSERT(::GetMoviesError() == noErr);
 655     }
 656 #else
 657     if(m_timer && m_ctrl)
 658     {
 659         m_ctrl->GetParent()->MacWindowToRootWindow(&x, &y);
 660
 661         ::MoveControl( (ControlRef) m_ctrl->GetHandle(), x, y );
 662         m_ctrl->GetParent()->Refresh();
 663         m_ctrl->GetParent()->Update();
 664     }
 665 #endif
 666 }
 667
 668
 669 //in source file that contains stuff you don't directly use
 670 #include "wx/html/forcelnk.h"
 671 FORCE_LINK_ME(basewxmediabackends);
 672
 673 #endif //wxUSE_MEDIACTRL
 674
 675
 676
 677
 678