src/unix/mediactrl.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/unix/mediactrl.cpp
   3 // Purpose:     Built-in Media Backends for Unix
   4 // Author:      Ryan Norton <wxprojects@comcast.net>
   5 // Modified by:
   6 // Created:     02/04/05
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2004-2005 Ryan Norton
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 //===========================================================================
  13 //  DECLARATIONS
  14 //===========================================================================
  15
  16 //---------------------------------------------------------------------------
  17 // Pre-compiled header stuff
  18 //---------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24 #pragma hdrstop
  25 #endif
  26
  27 //---------------------------------------------------------------------------
  28 // Includes
  29 //---------------------------------------------------------------------------
  30 #include "wx/mediactrl.h"
  31
  32 //---------------------------------------------------------------------------
  33 // Compilation guard
  34 //---------------------------------------------------------------------------
  35 #if wxUSE_MEDIACTRL
  36
  37 //===========================================================================
  38 //  BACKEND DECLARATIONS
  39 //===========================================================================
  40
  41 //---------------------------------------------------------------------------
  42 //
  43 //  wxGStreamerMediaBackend
  44 //
  45 //TODO:
  46 //TODO:  This is really not the best way to play-stop -
  47 //TODO:  it should just have one playbin and stick with it the whole
  48 //TODO:  instance of wxGStreamerMediaBackend - but stopping appears
  49 //TODO:  to invalidate the playbin object...
  50 //TODO:
  51 //
  52 //---------------------------------------------------------------------------
  53 #if wxUSE_GSTREAMER
  54
  55 //---------------------------------------------------------------------------
  56 //  GStreamer Includes
  57 //---------------------------------------------------------------------------
  58 #include <gst/gst.h>
  59 #include <gst/xoverlay/xoverlay.h>
  60
  61 #include <string.h> //strstr
  62
  63 #include "wx/log.h"
  64
  65 #ifdef __WXGTK__
  66     //for <gdk/gdkx.h>/related for GDK_WINDOW_XWINDOW
  67 #    include "wx/gtk/win_gtk.h"
  68 #    include <gtk/gtksignal.h>
  69 #    if wxUSE_DYNLIB_CLASS
  70 #        include "wx/dynlib.h"
  71 #    endif
  72 //#    include <gst/gconf/gconf.h> //gstreamer gnome interface - needs deps
  73 #endif
  74
  75
  76 class WXDLLIMPEXP_MEDIA wxGStreamerMediaBackend : public wxMediaBackend
  77 {
  78 public:
  79
  80     wxGStreamerMediaBackend();
  81     ~wxGStreamerMediaBackend();
  82
  83     virtual bool CreateControl(wxControl* ctrl, wxWindow* parent,
  84                                      wxWindowID id,
  85                                      const wxPoint& pos,
  86                                      const wxSize& size,
  87                                      long style,
  88                                      const wxValidator& validator,
  89                                      const wxString& name);
  90
  91     virtual bool Play();
  92     virtual bool Pause();
  93     virtual bool Stop();
  94
  95     virtual bool Load(const wxString& fileName);
  96     virtual bool Load(const wxURI& location);
  97
  98     virtual wxMediaState GetState();
  99
 100     virtual bool SetPosition(wxLongLong where);
 101     virtual wxLongLong GetPosition();
 102     virtual wxLongLong GetDuration();
 103
 104     virtual void Move(int x, int y, int w, int h);
 105     wxSize GetVideoSize() const;
 106
 107     virtual double GetPlaybackRate();
 108     virtual bool SetPlaybackRate(double dRate);
 109
 110     void Cleanup();
 111
 112     static void OnFinish(GstElement *play,  gpointer data);
 113     static void OnError (GstElement *play,  GstElement *src,
 114                          GError     *err,   gchar      *debug,
 115                          gpointer    data);
 116     static void OnVideoCapsReady(GstPad* pad,  GParamSpec* pspec, gpointer data);
 117
 118     static bool TransCapsToVideoSize(wxGStreamerMediaBackend* be, GstPad* caps);
 119     void PostRecalcSize();
 120
 121 #ifdef __WXGTK__
 122     static gint OnGTKRealize(GtkWidget* theWidget, wxGStreamerMediaBackend* be);
 123 #endif
 124
 125     GstElement* m_player;       //GStreamer media element
 126
 127     wxSize      m_videoSize;
 128     wxControl*  m_ctrl;
 129
 130     wxLongLong m_nPausedPos;
 131
 132     DECLARE_DYNAMIC_CLASS(wxGStreamerMediaBackend);
 133 };
 134
 135
 136 //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 137 //
 138 // wxGStreamerMediaBackend
 139 //
 140 //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 141
 142 IMPLEMENT_DYNAMIC_CLASS(wxGStreamerMediaBackend, wxMediaBackend)
 143
 144 //---------------------------------------------------------------------------
 145 // wxGStreamerMediaBackend Constructor
 146 //
 147 // Sets m_player to NULL signifying we havn't loaded anything yet
 148 //---------------------------------------------------------------------------
 149 wxGStreamerMediaBackend::wxGStreamerMediaBackend() : m_player(NULL), m_videoSize(0,0)
 150 {
 151 }
 152
 153 //---------------------------------------------------------------------------
 154 // wxGStreamerMediaBackend Destructor
 155 //
 156 // Stops/cleans up memory
 157 //---------------------------------------------------------------------------
 158 wxGStreamerMediaBackend::~wxGStreamerMediaBackend()
 159 {
 160     Cleanup();
 161 }
 162
 163 //---------------------------------------------------------------------------
 164 // wxGStreamerMediaBackend::OnGTKRealize
 165 //
 166 // If the window wasn't realized when Load was called, this is the
 167 // callback for when it is.
 168 //
 169 // 1) Installs GTK idle handler if it doesn't exist
 170 // 2) Yeilds to avoid an X11 bug (?)
 171 // 3) Tells GStreamer to play the video in our control
 172 //---------------------------------------------------------------------------
 173 #ifdef __WXGTK__
 174
 175 #ifdef __WXDEBUG__
 176
 177 #if wxUSE_THREADS
 178 #   define DEBUG_MAIN_THREAD if (wxThread::IsMain() && g_mainThreadLocked) printf("gui reentrance");
 179 #else
 180 #   define DEBUG_MAIN_THREAD
 181 #endif
 182 #else
 183 #define DEBUG_MAIN_THREAD
 184 #endif // Debug
 185
 186 extern void wxapp_install_idle_handler();
 187 extern bool g_isIdle;
 188 extern bool g_mainThreadLocked;
 189
 190 gint wxGStreamerMediaBackend::OnGTKRealize(GtkWidget* theWidget,
 191                                            wxGStreamerMediaBackend* be)
 192 {
 193     DEBUG_MAIN_THREAD
 194
 195     if (g_isIdle)
 196         wxapp_install_idle_handler();
 197
 198     wxYield();    //FIXME: X Server gets an error if I don't do this or a messagebox beforehand?!?!??
 199
 200     GdkWindow *window = GTK_PIZZA(theWidget)->bin_window;
 201     wxASSERT(window);
 202
 203     GstElement* videosink;
 204     g_object_get (G_OBJECT (be->m_player), "video-sink", &videosink, NULL);
 205
 206     GstElement* overlay = gst_bin_get_by_interface (GST_BIN (videosink),
 207                                     GST_TYPE_X_OVERLAY);
 208     gst_x_overlay_set_xwindow_id( GST_X_OVERLAY(overlay),
 209                                 GDK_WINDOW_XWINDOW( window )
 210                                 );
 211
 212     return 0;
 213 }
 214
 215
 216 #endif
 217
 218 //---------------------------------------------------------------------------
 219 // wxGStreamerMediaBackend::Cleanup
 220 //
 221 // Frees the gstreamer interfaces if there were any created
 222 //---------------------------------------------------------------------------
 223 void wxGStreamerMediaBackend::Cleanup()
 224 {
 225     if(m_player && GST_IS_OBJECT(m_player))
 226     {
 227         gst_element_set_state (m_player, GST_STATE_NULL);
 228         gst_object_unref (GST_OBJECT (m_player));
 229     }
 230 }
 231
 232 //---------------------------------------------------------------------------
 233 // wxGStreamerMediaBackend::CreateControl
 234 //
 235 // Initializes GStreamer and creates the wx side of our media control
 236 //---------------------------------------------------------------------------
 237 bool wxGStreamerMediaBackend::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     //init gstreamer
 246     gst_init(NULL, NULL);
 247
 248     m_ctrl = ctrl;
 249
 250     return m_ctrl->wxControl::Create(parent, id, pos, size,
 251                             style,  //remove borders???
 252                             validator, name);
 253 }
 254
 255 //---------------------------------------------------------------------------
 256 // wxGStreamerMediaBackend::TransCapsToVideoSize
 257 //
 258 // Gets the size of our video (in wxSize) from a GstPad
 259 //---------------------------------------------------------------------------
 260 bool wxGStreamerMediaBackend::TransCapsToVideoSize(wxGStreamerMediaBackend* be, GstPad* pad)
 261 {
 262     const GstCaps* caps = GST_PAD_CAPS (pad);
 263     if(caps)
 264     {
 265
 266         const GstStructure *s;
 267         s = gst_caps_get_structure (caps, 0);
 268         wxASSERT(s);
 269
 270         gst_structure_get_int (s, "width", &be->m_videoSize.x);
 271         gst_structure_get_int (s, "height", &be->m_videoSize.y);
 272
 273         wxLogDebug(wxT("Native video size: [%i,%i]"), be->m_videoSize.x, be->m_videoSize.y);
 274
 275         const GValue *par;
 276         par = gst_structure_get_value (s, "pixel-aspect-ratio");
 277
 278         if (par)
 279         {
 280             int num = gst_value_get_fraction_numerator (par),
 281                 den = gst_value_get_fraction_denominator (par);
 282
 283             //TODO: maybe better fraction normalization...
 284             if (num > den)
 285                 be->m_videoSize.x = (int) ((float) num * be->m_videoSize.x / den);
 286             else
 287                 be->m_videoSize.y = (int) ((float) den * be->m_videoSize.y / num);
 288         }
 289
 290         wxLogDebug(wxT("Adjusted video size: [%i,%i]"), be->m_videoSize.x, be->m_videoSize.y);
 291
 292         be->PostRecalcSize();
 293         return true;
 294     }//end if caps
 295
 296     return false;
 297 }
 298
 299 //---------------------------------------------------------------------------
 300 // wxGStreamerMediaBackend::PostRecalcSize
 301 //
 302 // Forces parent to recalc its layout if it has sizers to update
 303 // to the new video size
 304 //---------------------------------------------------------------------------
 305 void wxGStreamerMediaBackend::PostRecalcSize()
 306 {
 307         m_ctrl->InvalidateBestSize();
 308         m_ctrl->GetParent()->Layout();
 309         m_ctrl->GetParent()->Refresh();
 310         m_ctrl->GetParent()->Update();
 311         m_ctrl->SetSize(m_ctrl->GetSize());
 312 }
 313
 314 //---------------------------------------------------------------------------
 315 // wxGStreamerMediaBackend::OnFinish
 316 //
 317 // Called by gstreamer when the media is done playing
 318 //
 319 // 1) Send a wxEVT_MEDIA_STOP to the control
 320 // 2) If veteod, break out
 321 // 3) really stop the media
 322 // 4) Send a wxEVT_MEDIA_FINISHED to the control
 323 //---------------------------------------------------------------------------
 324 void wxGStreamerMediaBackend::OnFinish(GstElement *play, gpointer    data)
 325 {
 326     wxGStreamerMediaBackend* m_parent = (wxGStreamerMediaBackend*) data;
 327
 328     wxMediaEvent theEvent(wxEVT_MEDIA_STOP,
 329                         m_parent->m_ctrl->GetId());
 330     m_parent->m_ctrl->ProcessEvent(theEvent);
 331
 332     if(theEvent.IsAllowed())
 333     {
 334         bool bOk = m_parent->Stop();
 335         wxASSERT(bOk);
 336
 337         //send the event to our child
 338         wxMediaEvent theEvent(wxEVT_MEDIA_FINISHED,
 339                             m_parent->m_ctrl->GetId());
 340         m_parent->m_ctrl->ProcessEvent(theEvent);
 341     }
 342 }
 343
 344 //---------------------------------------------------------------------------
 345 // wxGStreamerMediaBackend::OnError
 346 //
 347 // Called by gstreamer when an error is encountered playing the media
 348 //
 349 // TODO: Make this better - maybe some more intelligent wxLog stuff
 350 //---------------------------------------------------------------------------
 351 void wxGStreamerMediaBackend::OnError(GstElement *play,
 352     GstElement *src,
 353     GError     *err,
 354     gchar      *debug,
 355     gpointer    data)
 356 {
 357     wxLogSysError(
 358         wxString::Format(
 359             wxT("Error in wxMediaCtrl!\nError Message:%s\nDebug:%s\n"),
 360             (const wxChar*)wxConvUTF8.cMB2WX(err->message),
 361             (const wxChar*)wxConvUTF8.cMB2WX(debug)
 362                         )
 363                  );
 364 }
 365
 366
 367 //---------------------------------------------------------------------------
 368 // wxGStreamerMediaBackend::Load (File version)
 369 //
 370 // Just calls the URI version
 371 //---------------------------------------------------------------------------
 372 bool wxGStreamerMediaBackend::Load(const wxString& fileName)
 373 {
 374     return Load(
 375                     wxURI(
 376                             wxString( wxT("file://") ) + fileName
 377                          )
 378                );
 379 }
 380
 381 //---------------------------------------------------------------------------
 382 // wxGStreamerMediaBackend::OnVideoCapsReady
 383 //
 384 // Called by gstreamer when the video caps for the media is ready
 385 //---------------------------------------------------------------------------
 386 void wxGStreamerMediaBackend::OnVideoCapsReady(GstPad* pad, GParamSpec* pspec, gpointer data)
 387 {
 388     wxGStreamerMediaBackend::TransCapsToVideoSize((wxGStreamerMediaBackend*) data, pad);
 389 }
 390
 391 //---------------------------------------------------------------------------
 392 // wxGStreamerMediaBackend::Load (URI version)
 393 //
 394 // 1) Stops/Cleanups the previous instance if there is any
 395 // 2) Creates the gstreamer playbin
 396 // 3) If there is no playbin bail out
 397 // 4) Set up the error and end-of-stream callbacks for our player
 398 // 5) Make our video sink and make sure it supports the x overlay interface
 399 // 6) Make sure the passed URI is valid and tell playbin to load it
 400 // 7) Use the xoverlay extension to tell gstreamer to play in our window
 401 // 8) Get the video size - pause required to set the stream in action
 402 //---------------------------------------------------------------------------
 403 bool wxGStreamerMediaBackend::Load(const wxURI& location)
 404 {
 405     //1
 406     Cleanup();
 407
 408     //2
 409     m_player    = gst_element_factory_make ("playbin", "play");
 410
 411     //3
 412     if (!m_player)
 413         return false;
 414
 415     //4
 416     g_signal_connect (m_player, "eos", G_CALLBACK (OnFinish), this);
 417     g_signal_connect (m_player, "error", G_CALLBACK (OnError), this);
 418
 419     //5
 420     GstElement* overlay = NULL;
 421     GstElement* videosink;
 422
 423 #if defined(__WXGTK__) && wxUSE_DYNLIB_CLASS
 424
 425     //use gnome-specific gstreamer extensions
 426     //if synthisis (?) file not found, it
 427     //spits out a warning and uses ximagesink
 428     wxDynamicLibrary gstgconf;
 429     if(gstgconf.Load(gstgconf.CanonicalizeName(wxT("gstgconf-0.8"))))
 430     {
 431         typedef GstElement* (*LPgst_gconf_get_default_video_sink) (void);
 432         LPgst_gconf_get_default_video_sink pGst_gconf_get_default_video_sink =
 433         (LPgst_gconf_get_default_video_sink)
 434             gstgconf.GetSymbol(wxT("gst_gconf_get_default_video_sink"));
 435
 436         if (pGst_gconf_get_default_video_sink)
 437         {
 438             videosink = (*pGst_gconf_get_default_video_sink) ();
 439             wxASSERT( GST_IS_BIN(videosink) );
 440             overlay = gst_bin_get_by_interface (GST_BIN (videosink),
 441                                             GST_TYPE_X_OVERLAY);
 442         }
 443
 444         gstgconf.Detach();
 445     }
 446
 447     if ( ! GST_IS_X_OVERLAY(overlay) )
 448     {
 449 #endif
 450         wxLogDebug(wxT("Could not load Gnome preferences, reverting to xvimagesink for video for gstreamer"));
 451         videosink = gst_element_factory_make ("xvimagesink", "videosink");
 452         if ( !GST_IS_OBJECT(videosink) )
 453             videosink = gst_element_factory_make ("ximagesink", "videosink");
 454
 455         overlay = videosink;
 456
 457         wxASSERT( GST_IS_X_OVERLAY(overlay) );
 458         if ( ! GST_IS_X_OVERLAY(overlay) )
 459             return false;
 460 #if defined(__WXGTK__) && wxUSE_DYNLIB_CLASS
 461     }
 462 #endif
 463
 464     g_object_set (G_OBJECT (m_player),
 465                     "video-sink", videosink,
 466 //                    "audio-sink", m_audiosink,
 467                     NULL);
 468
 469     //6
 470     wxString locstring = location.BuildUnescapedURI();
 471     wxASSERT(gst_uri_protocol_is_valid("file"));
 472     wxASSERT(gst_uri_is_valid(locstring.mb_str()));
 473
 474     g_object_set (G_OBJECT (m_player), "uri", (const char*)locstring.mb_str(), NULL);
 475
 476     //7
 477 #ifdef __WXGTK__
 478     if(!GTK_WIDGET_REALIZED(m_ctrl->m_wxwindow))
 479     {
 480         //Not realized yet - set to connect at realization time
 481         g_signal_connect (m_ctrl->m_wxwindow,
 482                           "realize",
 483                           G_CALLBACK (wxGStreamerMediaBackend::OnGTKRealize),
 484                           this);
 485     }
 486     else
 487     {
 488         wxYield(); //see realize callback...
 489         GdkWindow *window = GTK_PIZZA(m_ctrl->m_wxwindow)->bin_window;
 490         wxASSERT(window);
 491 #endif
 492
 493
 494     gst_x_overlay_set_xwindow_id( GST_X_OVERLAY(overlay),
 495 #ifdef __WXGTK__
 496                         GDK_WINDOW_XWINDOW( window )
 497 #else
 498                         ctrl->GetHandle()
 499 #endif
 500                                   );
 501
 502 #ifdef __WXGTK__
 503     } //end else block
 504 #endif
 505
 506     //8
 507     int nResult = gst_element_set_state (m_player, GST_STATE_PAUSED);
 508     if(nResult != GST_STATE_SUCCESS)
 509     {
 510         wxLogDebug(wxT("Could not set initial state to paused!"));
 511         return false;
 512     }
 513
 514     const GList *list = NULL;
 515     g_object_get (G_OBJECT (m_player), "stream-info", &list, NULL);
 516
 517     bool bVideoFound = false;
 518
 519     for ( ; list != NULL; list = list->next)
 520     {
 521         GObject *info = (GObject *) list->data;
 522         gint type;
 523         GParamSpec *pspec;
 524         GEnumValue *val;
 525         GstPad *pad = NULL;
 526
 527         g_object_get (info, "type", &type, NULL);
 528         pspec = g_object_class_find_property (
 529                         G_OBJECT_GET_CLASS (info), "type");
 530         val = g_enum_get_value (G_PARAM_SPEC_ENUM (pspec)->enum_class, type);
 531
 532         if (strstr (val->value_name, "VIDEO"))
 533         {
 534             //Newer gstreamer 0.8+ is SUPPOSED to have "object"...
 535             //but a lot of old plugins still use "pad" :)
 536             pspec = g_object_class_find_property (
 537                         G_OBJECT_GET_CLASS (info), "object");
 538
 539             if (!pspec)
 540                 g_object_get (info, "pad", &pad, NULL);
 541             else
 542                 g_object_get (info, "object", &pad, NULL);
 543
 544             pad = (GstPad *) GST_PAD_REALIZE (pad);
 545             wxASSERT(pad);
 546
 547             if(!wxGStreamerMediaBackend::TransCapsToVideoSize(this, pad));
 548             {
 549                 //wait for those caps to get ready
 550                 g_signal_connect(
 551                 pad,
 552                 "notify::caps",
 553                 G_CALLBACK(wxGStreamerMediaBackend::OnVideoCapsReady),
 554                 this);
 555             }
 556
 557             bVideoFound = true;
 558             break;
 559         }//end if video
 560         else
 561         {
 562             m_videoSize = wxSize(0,0);
 563             PostRecalcSize();
 564         }
 565     }//end searching through info list
 566
 567     if(!bVideoFound)
 568     {
 569         wxLogDebug(wxT("No video found for gstreamer stream"));
 570     }
 571     m_nPausedPos = 0;
 572
 573     //send loaded event
 574     wxMediaEvent theEvent(wxEVT_MEDIA_LOADED,
 575                             m_ctrl->GetId());
 576     m_ctrl->AddPendingEvent(theEvent);
 577
 578     return true;
 579 }
 580
 581 //---------------------------------------------------------------------------
 582 // wxGStreamerMediaBackend::Play
 583 //
 584 // Sets the stream to a playing state
 585 //---------------------------------------------------------------------------
 586 bool wxGStreamerMediaBackend::Play()
 587 {
 588     if (gst_element_set_state (m_player, GST_STATE_PLAYING)
 589             != GST_STATE_SUCCESS)
 590         return false;
 591     return true;
 592 }
 593
 594 //---------------------------------------------------------------------------
 595 // wxGStreamerMediaBackend::Pause
 596 //
 597 // Marks where we paused and pauses the stream
 598 //---------------------------------------------------------------------------
 599 bool wxGStreamerMediaBackend::Pause()
 600 {
 601     m_nPausedPos = GetPosition();
 602     if (gst_element_set_state (m_player, GST_STATE_PAUSED)
 603             != GST_STATE_SUCCESS)
 604         return false;
 605     return true;
 606 }
 607
 608 //---------------------------------------------------------------------------
 609 // wxGStreamerMediaBackend::Stop
 610 //
 611 // Pauses the stream and sets the position to 0
 612 //---------------------------------------------------------------------------
 613 bool wxGStreamerMediaBackend::Stop()
 614 {
 615     if (gst_element_set_state (m_player,
 616                     GST_STATE_PAUSED)    != GST_STATE_SUCCESS)
 617         return false;
 618     return wxGStreamerMediaBackend::SetPosition(0);
 619 }
 620
 621 //---------------------------------------------------------------------------
 622 // wxGStreamerMediaBackend::GetState
 623 //
 624 // Gets the state of the stream
 625 //---------------------------------------------------------------------------
 626 wxMediaState wxGStreamerMediaBackend::GetState()
 627 {
 628     switch(GST_STATE(m_player))
 629     {
 630         case GST_STATE_PLAYING:
 631             return wxMEDIASTATE_PLAYING;
 632         case GST_STATE_PAUSED:
 633             if (m_nPausedPos == 0)
 634                 return wxMEDIASTATE_STOPPED;
 635             else
 636                 return wxMEDIASTATE_PAUSED;
 637         default://case GST_STATE_READY:
 638             return wxMEDIASTATE_STOPPED;
 639     }
 640 }
 641
 642 //---------------------------------------------------------------------------
 643 // wxGStreamerMediaBackend::GetPosition
 644 //
 645 // If paused, returns our marked position - otherwise it queries the
 646 // GStreamer playbin for the position and returns that
 647 //
 648 //TODO:
 649 //TODO: In lue of the last big TODO, when you pause and seek gstreamer
 650 //TODO: doesn't update the position sometimes, so we need to keep track of whether
 651 //TODO: we have paused or not and keep track of the time after the pause
 652 //TODO: and whenever the user seeks while paused
 653 //TODO:
 654 //---------------------------------------------------------------------------
 655 wxLongLong wxGStreamerMediaBackend::GetPosition()
 656 {
 657     if(GetState() != wxMEDIASTATE_PLAYING)
 658         return m_nPausedPos;
 659     else
 660     {
 661         gint64 pos;
 662         GstFormat fmtTime = GST_FORMAT_TIME;
 663
 664         if (!gst_element_query (m_player, GST_QUERY_POSITION, &fmtTime, &pos))
 665             return 0;
 666         return pos / GST_MSECOND ;
 667     }
 668 }
 669
 670 //---------------------------------------------------------------------------
 671 // wxGStreamerMediaBackend::SetPosition
 672 //
 673 // Sets the position of the stream
 674 // Note that GST_MSECOND is 1000000 (GStreamer uses nanoseconds - so
 675 // there is 1000000 nanoseconds in a millisecond)
 676 //
 677 // If paused marks where we seeked to
 678 //---------------------------------------------------------------------------
 679 bool wxGStreamerMediaBackend::SetPosition(wxLongLong where)
 680 {
 681     if( gst_element_seek (m_player, (GstSeekType) (GST_SEEK_METHOD_SET |
 682             GST_FORMAT_TIME | GST_SEEK_FLAG_FLUSH),
 683             where.GetValue() * GST_MSECOND ) )
 684     {
 685         if (GetState() != wxMEDIASTATE_PLAYING)
 686             m_nPausedPos = where;
 687
 688         return true;
 689     }
 690
 691     return false;
 692 }
 693
 694 //---------------------------------------------------------------------------
 695 // wxGStreamerMediaBackend::GetDuration
 696 //
 697 // Obtains the total time of our stream
 698 //---------------------------------------------------------------------------
 699 wxLongLong wxGStreamerMediaBackend::GetDuration()
 700 {
 701     gint64 length;
 702     GstFormat fmtTime = GST_FORMAT_TIME;
 703
 704     if(!gst_element_query(m_player, GST_QUERY_TOTAL, &fmtTime, &length))
 705         return 0;
 706     return length / GST_MSECOND ;
 707 }
 708
 709 //---------------------------------------------------------------------------
 710 // wxGStreamerMediaBackend::Move
 711 //
 712 // Called when the window is moved - GStreamer takes care of this
 713 // for us so nothing is needed
 714 //---------------------------------------------------------------------------
 715 void wxGStreamerMediaBackend::Move(int x, int y, int w, int h)
 716 {
 717 }
 718
 719 //---------------------------------------------------------------------------
 720 // wxGStreamerMediaBackend::GetVideoSize
 721 //
 722 // Returns our cached video size from Load/OnVideoCapsReady
 723 //---------------------------------------------------------------------------
 724 wxSize wxGStreamerMediaBackend::GetVideoSize() const
 725 {
 726     return m_videoSize;
 727 }
 728
 729 //---------------------------------------------------------------------------
 730 // wxGStreamerMediaBackend::GetPlaybackRate
 731 // wxGStreamerMediaBackend::SetPlaybackRate
 732 //
 733 // Obtains/Sets the playback rate of the stream
 734 //
 735 //TODO: PlaybackRate not currently supported via playbin directly -
 736 //TODO: Ronald S. Bultje noted on gstreamer-devel:
 737 //TODO:
 738 //TODO: Like "play at twice normal speed"? Or "play at 25 fps and 44,1 kHz"? As
 739 //TODO: for the first, yes, we have elements for that, btu they"re not part of
 740 //TODO: playbin. You can create a bin (with a ghost pad) containing the actual
 741 //TODO: video/audiosink and the speed-changing element for this, and set that
 742 //TODO: element as video-sink or audio-sink property in playbin. The
 743 //TODO: audio-element is called "speed", the video-element is called "videodrop"
 744 //TODO: (although that appears to be deprecated in favour of "videorate", which
 745 //TODO: again cannot do this, so this may not work at all in the end). For
 746 //TODO: forcing frame/samplerates, see audioscale and videorate. Audioscale is
 747 //TODO: part of playbin.
 748 //---------------------------------------------------------------------------
 749 double wxGStreamerMediaBackend::GetPlaybackRate()
 750 {
 751     //not currently supported via playbin
 752     return 1.0;
 753 }
 754
 755 bool wxGStreamerMediaBackend::SetPlaybackRate(double dRate)
 756 {
 757     //not currently supported via playbin
 758     return false;
 759 }
 760
 761 #endif //wxUSE_GSTREAMER
 762
 763 //in source file that contains stuff you don't directly use
 764 #include "wx/html/forcelnk.h"
 765 FORCE_LINK_ME(basewxmediabackends)
 766
 767 #endif //wxUSE_MEDIACTRL