lumiera_documentation/src/gui/output/xvdisplayer.cpp

/*
  XvDisplayer  -  XVideo display

  Copyright (C)         Lumiera.org
    2000,               Arne Schirmacher <arne@schirmacher.de>
    2001-2007,          Dan Dennedy <dan@dennedy.org>
    2008,               Joel Holdsworth <joel@airwebreathe.org.uk>

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 2 of
  the License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

* *****************************************************/


#include "gui/gtk-lumiera.hpp"
#include "gui/output/xvdisplayer.hpp"
#include "include/logging.h"

#include <gdk/gdkx.h>

namespace gui {
namespace output {
  
  XvDisplayer::XvDisplayer(Gtk::Widget *drawing_area,
                           int width, int height)
    : gotPort(false)
    , drawingArea(drawing_area)
    , xvImage(NULL)
    {
      REQUIRE(drawing_area != NULL);
      REQUIRE(width > 0);
      REQUIRE(height > 0);
      
      INFO(gui, "Trying XVideo at %d x %d", width, height);
    
      imageWidth = width;
      imageHeight = height;
    
      shmInfo.shmaddr = NULL;
    
      Glib::RefPtr<Gdk::Window> area_window = drawing_area->get_window();
    
      window = GDK_WINDOW_XID (area_window->gobj());
      display = GDK_WINDOW_XDISPLAY (area_window->gobj());
    
      unsigned int  count;
      XvAdaptorInfo* adaptorInfo;
    
      if (XvQueryAdaptors (display, window, &count, &adaptorInfo) == Success)
        {
          INFO(gui, "XvQueryAdaptors count: %d", count);
          for (unsigned int n = 0; gotPort == false && n < count; ++n )
            {
              // Diagnostics
              INFO(gui, "%s, %lu, %lu", adaptorInfo[ n ].name,
                adaptorInfo[ n ].base_id, adaptorInfo[ n ].num_ports - 1);
    
              for ( unsigned int port = adaptorInfo[ n ].base_id;
                      port < adaptorInfo[ n ].base_id + adaptorInfo[ n ].num_ports;
                      port ++ )
                {
                  if ( XvGrabPort( display, port, CurrentTime ) == Success )
                    {
                      int formats;
                      XvImageFormatValues *list;
    
                      list = XvListImageFormats( display, port, &formats );
    
                      INFO(gui, "formats supported: %d", formats);
    
                      for ( int i = 0; i < formats; i ++ )
                        {
                          INFO(gui, "0x%x (%c%c%c%c) %s",
                                   list[ i ].id,
                                   ( list[ i ].id ) & 0xff,
                                   ( list[ i ].id >> 8 ) & 0xff,
                                   ( list[ i ].id >> 16 ) & 0xff,
                                   ( list[ i ].id >> 24 ) & 0xff,
                                   ( list[ i ].format == XvPacked ) ? "packed" : "planar" );
                          if ( list[ i ].id == 0x32595559 && !gotPort )
                            gotPort = true;
                        }
    
                      if ( !gotPort )
                        {
                          XvUngrabPort( display, port, CurrentTime );
                        }
                      else
                        {
                          grabbedPort = port;
                          break;
                        }
                    }
                }
            }
    
          if ( gotPort )
            {
              int num;
              unsigned int unum;
              XvEncodingInfo *enc;
              
              XvQueryEncodings( display, grabbedPort, &unum, &enc );
              for ( unsigned int index = 0; index < unum; index ++ )
                {
                  INFO (gui, "%d: %s, %ldx%ld rate = %d/%d",
                             index, enc->name,
                             enc->width, enc->height,
                             enc->rate.numerator,
                             enc->rate.denominator);
                }
              
              XvAttribute *xvattr = XvQueryPortAttributes (display, grabbedPort, &num);
              for (int k = 0; k < num; k++ )
                {
                  if ( xvattr[k].flags & XvSettable ) 
                    {
                      if ( strcmp( xvattr[k].name, "XV_AUTOPAINT_COLORKEY") == 0 )
                        {
                          Atom val_atom = XInternAtom( display, xvattr[k].name, False );
                          if (XvSetPortAttribute(display, grabbedPort, val_atom, 1 ) != Success )
                            NOBUG_ERROR(gui, "Couldn't set Xv attribute %s\n", xvattr[k].name);
                        }
                      else if (  strcmp( xvattr[k].name, "XV_COLORKEY") == 0 )
                        {
                          Atom val_atom = XInternAtom( display, xvattr[k].name, False );
                          if ( XvSetPortAttribute( display, grabbedPort, val_atom, 0x010102 ) != Success )
                            NOBUG_ERROR(gui, "Couldn't set Xv attribute %s\n", xvattr[k].name);
                        }
                    }
                }
            }
    
          if (gotPort)
            {
              XGCValues values;
              memset(&values, 0, sizeof(XGCValues));
              gc = XCreateGC( display, window, 0, NULL );
    
              xvImage = ( XvImage * ) XvShmCreateImage( display, grabbedPort, 0x32595559, 0, width, height, &shmInfo );
    
              shmInfo.shmid = shmget( IPC_PRIVATE, xvImage->data_size, IPC_CREAT | 0777 );
              if (shmInfo.shmid < 0) {
                  perror("shmget");
                  gotPort = false;
                }
              else
                {
                  shmInfo.shmaddr = (char *) shmat (shmInfo.shmid, 0, 0);
                  xvImage->data = shmInfo.shmaddr;
                  shmInfo.readOnly = 0;
    
                  if ( !XShmAttach( display, &shmInfo ))
                  {
                    gotPort = false;
                  }
    
                  XSync( display, false );
                  shmctl( shmInfo.shmid, IPC_RMID, 0 );
                }
            }
        }
      else
        {
          gotPort = false;
        }
    }
  
  
  XvDisplayer::~XvDisplayer()
  {
    NOBUG_ERROR(gui, "Destroying XV Displayer");
  
    if ( gotPort )
      {
        XvUngrabPort( display, grabbedPort, CurrentTime );
      }
  
    if ( shmInfo.shmaddr != NULL )
      {
        XShmDetach( display, &shmInfo );
        shmctl( shmInfo.shmid, IPC_RMID, 0 );
        shmdt( shmInfo.shmaddr );
      }
    
    if ( xvImage != NULL )
      XFree( xvImage );
  }
  
  
  bool
  XvDisplayer::usable()
  {
    return gotPort;
  }
  
  
  void
  XvDisplayer::put (void* const image)
  {
    REQUIRE (image != NULL);
    REQUIRE (drawingArea != NULL);
    
    if (xvImage != NULL)
      {
        REQUIRE(display != NULL);
        
        int video_x = 0, video_y = 0, video_width = 0, video_height = 0;
        calculateVideoLayout(
          drawingArea->get_width(),
          drawingArea->get_height(),
          preferredWidth(), preferredHeight(),
          video_x, video_y, video_width, video_height );
  
        memcpy (xvImage->data, image, xvImage->data_size);
  
        XvShmPutImage (display, grabbedPort, window, gc, xvImage,
                       0, 0, preferredWidth(), preferredHeight(),
                       video_x, video_y, video_width, video_height, false);
      }
  }
  
  
}}   // namespace gui::output