/////////////////////////////////////////////////////////////////////////////
-// Name: mac/carbon/mediactrl.cpp
-// Purpose: Built-in Media Backends for Unix (stub)
+// Name: src/unix/mediactrl.cpp
+// Purpose: Built-in Media Backends for Unix
// Author: Ryan Norton <wxprojects@comcast.net>
// Modified by:
// Created: 02/04/05
// Pre-compiled header stuff
//---------------------------------------------------------------------------
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-#pragma implementation "mediactrl.h"
-#endif
-
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
//---------------------------------------------------------------------------
#if wxUSE_MEDIACTRL
-//in source file that contains stuff you don't directly use
-#include <wx/html/forcelnk.h>
-FORCE_LINK_ME(basewxmediabackends);
+//===========================================================================
+// BACKEND DECLARATIONS
+//===========================================================================
-#endif //wxUSE_MEDIACTRL
+//---------------------------------------------------------------------------
+//
+// wxGStreamerMediaBackend
+//
+//TODO:
+//TODO: This is really not the best way to play-stop -
+//TODO: it should just have one playbin and stick with it the whole
+//TODO: instance of wxGStreamerMediaBackend - but stopping appears
+//TODO: to invalidate the playbin object...
+//TODO:
+//
+//---------------------------------------------------------------------------
+#if wxUSE_GSTREAMER
+
+//---------------------------------------------------------------------------
+// GStreamer Includes
+//---------------------------------------------------------------------------
+#include <gst/gst.h>
+#include <gst/xoverlay/xoverlay.h>
+
+#include <string.h> //strstr
+
+#include "wx/log.h"
+
+#ifdef __WXGTK__
+ //for <gdk/gdkx.h>/related for GDK_WINDOW_XWINDOW
+# include "wx/gtk/win_gtk.h"
+# include <gtk/gtksignal.h>
+# if wxUSE_DYNLIB_CLASS
+# include "wx/dynlib.h"
+# endif
+//# include <gst/gconf/gconf.h> //gstreamer gnome interface - needs deps
+#endif
+
+
+class WXDLLIMPEXP_MEDIA wxGStreamerMediaBackend : public wxMediaBackend
+{
+public:
+
+ wxGStreamerMediaBackend();
+ ~wxGStreamerMediaBackend();
+
+ virtual bool CreateControl(wxControl* ctrl, wxWindow* parent,
+ wxWindowID id,
+ const wxPoint& pos,
+ const wxSize& size,
+ long style,
+ const wxValidator& validator,
+ const wxString& name);
+
+ virtual bool Play();
+ virtual bool Pause();
+ virtual bool Stop();
+
+ virtual bool Load(const wxString& fileName);
+ virtual bool Load(const wxURI& location);
+
+ virtual wxMediaState GetState();
+ virtual bool SetPosition(wxLongLong where);
+ virtual wxLongLong GetPosition();
+ virtual wxLongLong GetDuration();
+ virtual void Move(int x, int y, int w, int h);
+ wxSize GetVideoSize() const;
+ virtual double GetPlaybackRate();
+ virtual bool SetPlaybackRate(double dRate);
+ void Cleanup();
+ static void OnFinish(GstElement *play, gpointer data);
+ static void OnError (GstElement *play, GstElement *src,
+ GError *err, gchar *debug,
+ gpointer data);
+ static void OnVideoCapsReady(GstPad* pad, GParamSpec* pspec, gpointer data);
+
+ static bool TransCapsToVideoSize(wxGStreamerMediaBackend* be, GstPad* caps);
+ void PostRecalcSize();
+
+#ifdef __WXGTK__
+ static gint OnGTKRealize(GtkWidget* theWidget, wxGStreamerMediaBackend* be);
+#endif
+
+ GstElement* m_player; //GStreamer media element
+
+ wxSize m_videoSize;
+ wxControl* m_ctrl;
+
+ wxLongLong m_nPausedPos;
+
+ DECLARE_DYNAMIC_CLASS(wxGStreamerMediaBackend);
+};
+
+
+//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+//
+// wxGStreamerMediaBackend
+//
+//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+IMPLEMENT_DYNAMIC_CLASS(wxGStreamerMediaBackend, wxMediaBackend)
+
+//---------------------------------------------------------------------------
+// wxGStreamerMediaBackend Constructor
+//
+// Sets m_player to NULL signifying we havn't loaded anything yet
+//---------------------------------------------------------------------------
+wxGStreamerMediaBackend::wxGStreamerMediaBackend() : m_player(NULL), m_videoSize(0,0)
+{
+}
+
+//---------------------------------------------------------------------------
+// wxGStreamerMediaBackend Destructor
+//
+// Stops/cleans up memory
+//---------------------------------------------------------------------------
+wxGStreamerMediaBackend::~wxGStreamerMediaBackend()
+{
+ Cleanup();
+}
+
+//---------------------------------------------------------------------------
+// wxGStreamerMediaBackend::OnGTKRealize
+//
+// If the window wasn't realized when Load was called, this is the
+// callback for when it is.
+//
+// 1) Installs GTK idle handler if it doesn't exist
+// 2) Yeilds to avoid an X11 bug (?)
+// 3) Tells GStreamer to play the video in our control
+//---------------------------------------------------------------------------
+#ifdef __WXGTK__
+
+#ifdef __WXDEBUG__
+
+#if wxUSE_THREADS
+# define DEBUG_MAIN_THREAD if (wxThread::IsMain() && g_mainThreadLocked) printf("gui reentrance");
+#else
+# define DEBUG_MAIN_THREAD
+#endif
+#else
+#define DEBUG_MAIN_THREAD
+#endif // Debug
+
+extern void wxapp_install_idle_handler();
+extern bool g_isIdle;
+extern bool g_mainThreadLocked;
+
+gint wxGStreamerMediaBackend::OnGTKRealize(GtkWidget* theWidget,
+ wxGStreamerMediaBackend* be)
+{
+ DEBUG_MAIN_THREAD
+
+ if (g_isIdle)
+ wxapp_install_idle_handler();
+
+ wxYield(); //FIXME: X Server gets an error if I don't do this or a messagebox beforehand?!?!??
+
+ GdkWindow *window = GTK_PIZZA(theWidget)->bin_window;
+ wxASSERT(window);
+
+ GstElement* videosink;
+ g_object_get (G_OBJECT (be->m_player), "video-sink", &videosink, NULL);
+
+ GstElement* overlay = gst_bin_get_by_interface (GST_BIN (videosink),
+ GST_TYPE_X_OVERLAY);
+ gst_x_overlay_set_xwindow_id( GST_X_OVERLAY(overlay),
+ GDK_WINDOW_XWINDOW( window )
+ );
+
+ return 0;
+}
+
+
+#endif
+
+//---------------------------------------------------------------------------
+// wxGStreamerMediaBackend::Cleanup
+//
+// Frees the gstreamer interfaces if there were any created
+//---------------------------------------------------------------------------
+void wxGStreamerMediaBackend::Cleanup()
+{
+ if(m_player && GST_IS_OBJECT(m_player))
+ {
+ gst_element_set_state (m_player, GST_STATE_NULL);
+ gst_object_unref (GST_OBJECT (m_player));
+ }
+}
+
+//---------------------------------------------------------------------------
+// wxGStreamerMediaBackend::CreateControl
+//
+// Initializes GStreamer and creates the wx side of our media control
+//---------------------------------------------------------------------------
+bool wxGStreamerMediaBackend::CreateControl(wxControl* ctrl, wxWindow* parent,
+ wxWindowID id,
+ const wxPoint& pos,
+ const wxSize& size,
+ long style,
+ const wxValidator& validator,
+ const wxString& name)
+{
+ //init gstreamer
+ gst_init(NULL, NULL);
+
+ m_ctrl = ctrl;
+
+ return m_ctrl->wxControl::Create(parent, id, pos, size,
+ style, //remove borders???
+ validator, name);
+}
+
+//---------------------------------------------------------------------------
+// wxGStreamerMediaBackend::TransCapsToVideoSize
+//
+// Gets the size of our video (in wxSize) from a GstPad
+//---------------------------------------------------------------------------
+bool wxGStreamerMediaBackend::TransCapsToVideoSize(wxGStreamerMediaBackend* be, GstPad* pad)
+{
+ const GstCaps* caps = GST_PAD_CAPS (pad);
+ if(caps)
+ {
+
+ const GstStructure *s;
+ s = gst_caps_get_structure (caps, 0);
+ wxASSERT(s);
+
+ gst_structure_get_int (s, "width", &be->m_videoSize.x);
+ gst_structure_get_int (s, "height", &be->m_videoSize.y);
+
+ wxLogDebug(wxT("Native video size: [%i,%i]"), be->m_videoSize.x, be->m_videoSize.y);
+
+ const GValue *par;
+ par = gst_structure_get_value (s, "pixel-aspect-ratio");
+
+ if (par)
+ {
+ int num = gst_value_get_fraction_numerator (par),
+ den = gst_value_get_fraction_denominator (par);
+
+ //TODO: maybe better fraction normalization...
+ if (num > den)
+ be->m_videoSize.x = (int) ((float) num * be->m_videoSize.x / den);
+ else
+ be->m_videoSize.y = (int) ((float) den * be->m_videoSize.y / num);
+ }
+
+ wxLogDebug(wxT("Adjusted video size: [%i,%i]"), be->m_videoSize.x, be->m_videoSize.y);
+
+ be->PostRecalcSize();
+ return true;
+ }//end if caps
+
+ return false;
+}
+
+//---------------------------------------------------------------------------
+// wxGStreamerMediaBackend::PostRecalcSize
+//
+// Forces parent to recalc its layout if it has sizers to update
+// to the new video size
+//---------------------------------------------------------------------------
+void wxGStreamerMediaBackend::PostRecalcSize()
+{
+ m_ctrl->InvalidateBestSize();
+ m_ctrl->GetParent()->Layout();
+ m_ctrl->GetParent()->Refresh();
+ m_ctrl->GetParent()->Update();
+ m_ctrl->SetSize(m_ctrl->GetSize());
+}
+
+//---------------------------------------------------------------------------
+// wxGStreamerMediaBackend::OnFinish
+//
+// Called by gstreamer when the media is done playing
+//
+// 1) Send a wxEVT_MEDIA_STOP to the control
+// 2) If veteod, break out
+// 3) really stop the media
+// 4) Send a wxEVT_MEDIA_FINISHED to the control
+//---------------------------------------------------------------------------
+void wxGStreamerMediaBackend::OnFinish(GstElement *play, gpointer data)
+{
+ wxGStreamerMediaBackend* m_parent = (wxGStreamerMediaBackend*) data;
+
+ wxMediaEvent theEvent(wxEVT_MEDIA_STOP,
+ m_parent->m_ctrl->GetId());
+ m_parent->m_ctrl->ProcessEvent(theEvent);
+
+ if(theEvent.IsAllowed())
+ {
+ bool bOk = m_parent->Stop();
+ wxASSERT(bOk);
+
+ //send the event to our child
+ wxMediaEvent theEvent(wxEVT_MEDIA_FINISHED,
+ m_parent->m_ctrl->GetId());
+ m_parent->m_ctrl->ProcessEvent(theEvent);
+ }
+}
+
+//---------------------------------------------------------------------------
+// wxGStreamerMediaBackend::OnError
+//
+// Called by gstreamer when an error is encountered playing the media
+//
+// TODO: Make this better - maybe some more intelligent wxLog stuff
+//---------------------------------------------------------------------------
+void wxGStreamerMediaBackend::OnError(GstElement *play,
+ GstElement *src,
+ GError *err,
+ gchar *debug,
+ gpointer data)
+{
+ wxLogSysError(
+ wxString::Format(
+ wxT("Error in wxMediaCtrl!\nError Message:%s\nDebug:%s\n"),
+ (const wxChar*)wxConvUTF8.cMB2WX(err->message),
+ (const wxChar*)wxConvUTF8.cMB2WX(debug)
+ )
+ );
+}
+
+
+//---------------------------------------------------------------------------
+// wxGStreamerMediaBackend::Load (File version)
+//
+// Just calls the URI version
+//---------------------------------------------------------------------------
+bool wxGStreamerMediaBackend::Load(const wxString& fileName)
+{
+ return Load(
+ wxURI(
+ wxString( wxT("file://") ) + fileName
+ )
+ );
+}
+
+//---------------------------------------------------------------------------
+// wxGStreamerMediaBackend::OnVideoCapsReady
+//
+// Called by gstreamer when the video caps for the media is ready
+//---------------------------------------------------------------------------
+void wxGStreamerMediaBackend::OnVideoCapsReady(GstPad* pad, GParamSpec* pspec, gpointer data)
+{
+ wxGStreamerMediaBackend::TransCapsToVideoSize((wxGStreamerMediaBackend*) data, pad);
+}
+
+//---------------------------------------------------------------------------
+// wxGStreamerMediaBackend::Load (URI version)
+//
+// 1) Stops/Cleanups the previous instance if there is any
+// 2) Creates the gstreamer playbin
+// 3) If there is no playbin bail out
+// 4) Set up the error and end-of-stream callbacks for our player
+// 5) Make our video sink and make sure it supports the x overlay interface
+// 6) Make sure the passed URI is valid and tell playbin to load it
+// 7) Use the xoverlay extension to tell gstreamer to play in our window
+// 8) Get the video size - pause required to set the stream in action
+//---------------------------------------------------------------------------
+bool wxGStreamerMediaBackend::Load(const wxURI& location)
+{
+ //1
+ Cleanup();
+
+ //2
+ m_player = gst_element_factory_make ("playbin", "play");
+
+ //3
+ if (!m_player)
+ return false;
+
+ //4
+ g_signal_connect (m_player, "eos", G_CALLBACK (OnFinish), this);
+ g_signal_connect (m_player, "error", G_CALLBACK (OnError), this);
+
+ //5
+ GstElement* overlay = NULL;
+ GstElement* videosink;
+
+#if defined(__WXGTK__) && wxUSE_DYNLIB_CLASS
+
+ //use gnome-specific gstreamer extensions
+ //if synthisis (?) file not found, it
+ //spits out a warning and uses ximagesink
+ wxDynamicLibrary gstgconf;
+ if(gstgconf.Load(gstgconf.CanonicalizeName(wxT("gstgconf-0.8"))))
+ {
+ typedef GstElement* (*LPgst_gconf_get_default_video_sink) (void);
+ LPgst_gconf_get_default_video_sink pGst_gconf_get_default_video_sink =
+ (LPgst_gconf_get_default_video_sink)
+ gstgconf.GetSymbol(wxT("gst_gconf_get_default_video_sink"));
+
+ if (pGst_gconf_get_default_video_sink)
+ {
+ videosink = (*pGst_gconf_get_default_video_sink) ();
+ wxASSERT( GST_IS_BIN(videosink) );
+ overlay = gst_bin_get_by_interface (GST_BIN (videosink),
+ GST_TYPE_X_OVERLAY);
+ }
+
+ gstgconf.Detach();
+ }
+
+ if ( ! GST_IS_X_OVERLAY(overlay) )
+ {
+#endif
+ wxLogDebug(wxT("Could not load Gnome preferences, reverting to xvimagesink for video for gstreamer"));
+ videosink = gst_element_factory_make ("xvimagesink", "videosink");
+ if ( !GST_IS_OBJECT(videosink) )
+ videosink = gst_element_factory_make ("ximagesink", "videosink");
+
+ overlay = videosink;
+
+ wxASSERT( GST_IS_X_OVERLAY(overlay) );
+ if ( ! GST_IS_X_OVERLAY(overlay) )
+ return false;
+#if defined(__WXGTK__) && wxUSE_DYNLIB_CLASS
+ }
+#endif
+
+ g_object_set (G_OBJECT (m_player),
+ "video-sink", videosink,
+// "audio-sink", m_audiosink,
+ NULL);
+
+ //6
+ wxString locstring = location.BuildUnescapedURI();
+ wxASSERT(gst_uri_protocol_is_valid("file"));
+ wxASSERT(gst_uri_is_valid(locstring.mb_str()));
+
+ g_object_set (G_OBJECT (m_player), "uri", (const char*)locstring.mb_str(), NULL);
+
+ //7
+#ifdef __WXGTK__
+ if(!GTK_WIDGET_REALIZED(m_ctrl->m_wxwindow))
+ {
+ //Not realized yet - set to connect at realization time
+ gtk_signal_connect( GTK_OBJECT(m_ctrl->m_wxwindow),
+ "realize",
+ GTK_SIGNAL_FUNC(wxGStreamerMediaBackend::OnGTKRealize),
+ (gpointer) this );
+ }
+ else
+ {
+ wxYield(); //see realize callback...
+ GdkWindow *window = GTK_PIZZA(m_ctrl->m_wxwindow)->bin_window;
+ wxASSERT(window);
+#endif
+
+
+ gst_x_overlay_set_xwindow_id( GST_X_OVERLAY(overlay),
+#ifdef __WXGTK__
+ GDK_WINDOW_XWINDOW( window )
+#else
+ ctrl->GetHandle()
+#endif
+ );
+
+#ifdef __WXGTK__
+ } //end else block
+#endif
+
+ //8
+ int nResult = gst_element_set_state (m_player, GST_STATE_PAUSED);
+ if(nResult != GST_STATE_SUCCESS)
+ {
+ wxLogDebug(wxT("Could not set initial state to paused!"));
+ return false;
+ }
+
+ const GList *list = NULL;
+ g_object_get (G_OBJECT (m_player), "stream-info", &list, NULL);
+
+ bool bVideoFound = false;
+
+ for ( ; list != NULL; list = list->next)
+ {
+ GObject *info = (GObject *) list->data;
+ gint type;
+ GParamSpec *pspec;
+ GEnumValue *val;
+ GstPad *pad = NULL;
+
+ g_object_get (info, "type", &type, NULL);
+ pspec = g_object_class_find_property (
+ G_OBJECT_GET_CLASS (info), "type");
+ val = g_enum_get_value (G_PARAM_SPEC_ENUM (pspec)->enum_class, type);
+
+ if (strstr (val->value_name, "VIDEO"))
+ {
+ //Newer gstreamer 0.8+ is SUPPOSED to have "object"...
+ //but a lot of old plugins still use "pad" :)
+ pspec = g_object_class_find_property (
+ G_OBJECT_GET_CLASS (info), "object");
+
+ if (!pspec)
+ g_object_get (info, "pad", &pad, NULL);
+ else
+ g_object_get (info, "object", &pad, NULL);
+
+ pad = (GstPad *) GST_PAD_REALIZE (pad);
+ wxASSERT(pad);
+
+ if(!wxGStreamerMediaBackend::TransCapsToVideoSize(this, pad));
+ {
+ //wait for those caps to get ready
+ g_signal_connect(
+ pad,
+ "notify::caps",
+ G_CALLBACK(wxGStreamerMediaBackend::OnVideoCapsReady),
+ this);
+ }
+
+ bVideoFound = true;
+ break;
+ }//end if video
+ else
+ {
+ m_videoSize = wxSize(0,0);
+ PostRecalcSize();
+ }
+ }//end searching through info list
+
+ if(!bVideoFound)
+ {
+ wxLogDebug(wxT("No video found for gstreamer stream"));
+ }
+ m_nPausedPos = 0;
+
+ //send loaded event
+ wxMediaEvent theEvent(wxEVT_MEDIA_LOADED,
+ m_ctrl->GetId());
+ m_ctrl->AddPendingEvent(theEvent);
+
+ return true;
+}
+
+//---------------------------------------------------------------------------
+// wxGStreamerMediaBackend::Play
+//
+// Sets the stream to a playing state
+//---------------------------------------------------------------------------
+bool wxGStreamerMediaBackend::Play()
+{
+ if (gst_element_set_state (m_player, GST_STATE_PLAYING)
+ != GST_STATE_SUCCESS)
+ return false;
+ return true;
+}
+
+//---------------------------------------------------------------------------
+// wxGStreamerMediaBackend::Pause
+//
+// Marks where we paused and pauses the stream
+//---------------------------------------------------------------------------
+bool wxGStreamerMediaBackend::Pause()
+{
+ m_nPausedPos = GetPosition();
+ if (gst_element_set_state (m_player, GST_STATE_PAUSED)
+ != GST_STATE_SUCCESS)
+ return false;
+ return true;
+}
+
+//---------------------------------------------------------------------------
+// wxGStreamerMediaBackend::Stop
+//
+// Pauses the stream and sets the position to 0
+//---------------------------------------------------------------------------
+bool wxGStreamerMediaBackend::Stop()
+{
+ if (gst_element_set_state (m_player,
+ GST_STATE_PAUSED) != GST_STATE_SUCCESS)
+ return false;
+ return wxGStreamerMediaBackend::SetPosition(0);
+}
+
+//---------------------------------------------------------------------------
+// wxGStreamerMediaBackend::GetState
+//
+// Gets the state of the stream
+//---------------------------------------------------------------------------
+wxMediaState wxGStreamerMediaBackend::GetState()
+{
+ switch(GST_STATE(m_player))
+ {
+ case GST_STATE_PLAYING:
+ return wxMEDIASTATE_PLAYING;
+ case GST_STATE_PAUSED:
+ if (m_nPausedPos == 0)
+ return wxMEDIASTATE_STOPPED;
+ else
+ return wxMEDIASTATE_PAUSED;
+ default://case GST_STATE_READY:
+ return wxMEDIASTATE_STOPPED;
+ }
+}
+
+//---------------------------------------------------------------------------
+// wxGStreamerMediaBackend::GetPosition
+//
+// If paused, returns our marked position - otherwise it queries the
+// GStreamer playbin for the position and returns that
+//
+//TODO:
+//TODO: In lue of the last big TODO, when you pause and seek gstreamer
+//TODO: doesn't update the position sometimes, so we need to keep track of whether
+//TODO: we have paused or not and keep track of the time after the pause
+//TODO: and whenever the user seeks while paused
+//TODO:
+//---------------------------------------------------------------------------
+wxLongLong wxGStreamerMediaBackend::GetPosition()
+{
+ if(GetState() != wxMEDIASTATE_PLAYING)
+ return m_nPausedPos;
+ else
+ {
+ gint64 pos;
+ GstFormat fmtTime = GST_FORMAT_TIME;
+
+ if (!gst_element_query (m_player, GST_QUERY_POSITION, &fmtTime, &pos))
+ return 0;
+ return pos / GST_MSECOND ;
+ }
+}
+
+//---------------------------------------------------------------------------
+// wxGStreamerMediaBackend::SetPosition
+//
+// Sets the position of the stream
+// Note that GST_MSECOND is 1000000 (GStreamer uses nanoseconds - so
+// there is 1000000 nanoseconds in a millisecond)
+//
+// If paused marks where we seeked to
+//---------------------------------------------------------------------------
+bool wxGStreamerMediaBackend::SetPosition(wxLongLong where)
+{
+ if( gst_element_seek (m_player, (GstSeekType) (GST_SEEK_METHOD_SET |
+ GST_FORMAT_TIME | GST_SEEK_FLAG_FLUSH),
+ where.GetValue() * GST_MSECOND ) )
+ {
+ if (GetState() != wxMEDIASTATE_PLAYING)
+ m_nPausedPos = where;
+
+ return true;
+ }
+
+ return false;
+}
+
+//---------------------------------------------------------------------------
+// wxGStreamerMediaBackend::GetDuration
+//
+// Obtains the total time of our stream
+//---------------------------------------------------------------------------
+wxLongLong wxGStreamerMediaBackend::GetDuration()
+{
+ gint64 length;
+ GstFormat fmtTime = GST_FORMAT_TIME;
+
+ if(!gst_element_query(m_player, GST_QUERY_TOTAL, &fmtTime, &length))
+ return 0;
+ return length / GST_MSECOND ;
+}
+
+//---------------------------------------------------------------------------
+// wxGStreamerMediaBackend::Move
+//
+// Called when the window is moved - GStreamer takes care of this
+// for us so nothing is needed
+//---------------------------------------------------------------------------
+void wxGStreamerMediaBackend::Move(int x, int y, int w, int h)
+{
+}
+
+//---------------------------------------------------------------------------
+// wxGStreamerMediaBackend::GetVideoSize
+//
+// Returns our cached video size from Load/OnVideoCapsReady
+//---------------------------------------------------------------------------
+wxSize wxGStreamerMediaBackend::GetVideoSize() const
+{
+ return m_videoSize;
+}
+
+//---------------------------------------------------------------------------
+// wxGStreamerMediaBackend::GetPlaybackRate
+// wxGStreamerMediaBackend::SetPlaybackRate
+//
+// Obtains/Sets the playback rate of the stream
+//
+//TODO: PlaybackRate not currently supported via playbin directly -
+//TODO: Ronald S. Bultje noted on gstreamer-devel:
+//TODO:
+//TODO: Like "play at twice normal speed"? Or "play at 25 fps and 44,1 kHz"? As
+//TODO: for the first, yes, we have elements for that, btu they"re not part of
+//TODO: playbin. You can create a bin (with a ghost pad) containing the actual
+//TODO: video/audiosink and the speed-changing element for this, and set that
+//TODO: element as video-sink or audio-sink property in playbin. The
+//TODO: audio-element is called "speed", the video-element is called "videodrop"
+//TODO: (although that appears to be deprecated in favour of "videorate", which
+//TODO: again cannot do this, so this may not work at all in the end). For
+//TODO: forcing frame/samplerates, see audioscale and videorate. Audioscale is
+//TODO: part of playbin.
+//---------------------------------------------------------------------------
+double wxGStreamerMediaBackend::GetPlaybackRate()
+{
+ //not currently supported via playbin
+ return 1.0;
+}
+
+bool wxGStreamerMediaBackend::SetPlaybackRate(double dRate)
+{
+ //not currently supported via playbin
+ return false;
+}
+
+#endif //wxUSE_GSTREAMER
+
+//in source file that contains stuff you don't directly use
+#include "wx/html/forcelnk.h"
+FORCE_LINK_ME(basewxmediabackends)
+
+#endif //wxUSE_MEDIACTRL
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