mediactrl.cpp

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/////////////////////////////////////////////////////////////////////////////
// Name:        unix/mediactrl.cpp
// Purpose:     Built-in Media Backends for Unix
// Author:      Ryan Norton <[e-mail]>
// Modified by:
// Created:     02/04/05
// RCS-ID:      $Id: mediactrl.cpp,v 1.8.2.1 2006/03/09 00:59:48 RD Exp $
// Copyright:   (c) 2004-2005 Ryan Norton
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

//===========================================================================
//  DECLARATIONS
//===========================================================================

//---------------------------------------------------------------------------
// 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"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

//---------------------------------------------------------------------------
// Includes
//---------------------------------------------------------------------------
#include "wx/mediactrl.h"

//---------------------------------------------------------------------------
// Compilation guard
//---------------------------------------------------------------------------
#if wxUSE_MEDIACTRL

//===========================================================================
//  BACKEND DECLARATIONS
//===========================================================================

//---------------------------------------------------------------------------
//
//  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();

    bool DoLoad(const wxString& locstring);
    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 = par->data[0].v_int,
                den = par->data[1].v_int;

            //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 DoLoad() with a prepended file scheme
//-----------------------------------------------------------------------------
bool wxGStreamerMediaBackend::Load(const wxString& fileName)
{
    return DoLoad(wxString( wxT("file://") ) + fileName);
}

//-----------------------------------------------------------------------------
// wxGStreamerMediaBackend::Load (URI version)
//
// In the case of a file URI passes it unencoded -
// also, as of 0.10.3 and earlier GstURI (the uri parser for gstreamer)
// is sort of broken and only accepts uris with at least two slashes
// after the scheme (i.e. file: == not ok, file:// == ok)
//-----------------------------------------------------------------------------
bool wxGStreamerMediaBackend::Load(const wxURI& location)
{
    if(location.GetScheme().CmpNoCase(wxT("file")) == 0)
    {
        wxString uristring = location.BuildUnescapedURI();

        //Workaround GstURI leading "//" problem and make sure it leads
        //with that
        return DoLoad(wxString(wxT("file://")) + 
                      uristring.Right(uristring.Length() - 5)
               );
    }
    else 
        return DoLoad(location.BuildURI());