ExampleV4L.cpp

Example for a v4l videosource with wx gui , VideoSourceCapabilities

Author

MIP

/*
This file is part of the BIAS library (Basic ImageAlgorithmS).

Copyright (C) 2003-2009    (see file CONTACT for details)
  Multimediale Systeme der Informationsverarbeitung
  Institut fuer Informatik
  Christian-Albrechts-Universitaet Kiel


BIAS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

BIAS 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with BIAS; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/


/** @example ExampleV4L.cpp
    @relates VideoSource_V4L, VideoSourceCapabilities
    @ingroup g_examples
    @ingroup g_videosource
    @brief  Example for a v4l videosource with wx gui
    @author MIP
*/

#include <Gui/ImageCanvas.hh>
#include <Gui/StringConv.hh>

#include <VideoSource/VideoSource_V4L.hh>
#include <VideoSource/VideoSourceCapabilities.hh>


#include <unistd.h>
#include <Base/Image/ImageConvert.hh>
#include <Base/Image/ImageIO.hh>
#include <Gui/StringConv.hh>
#include <Image/Camera.hh>



using namespace BIAS;
using namespace std;

bool done = false;
bool save = false;
int imgNo = 0;

/** \cond HIDDEN_SYMBOLS */
class MyApp : public wxApp
{
  virtual bool OnInit();
};

class MyFrame: public wxFrame
{
public:
  
  MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
  
  void OnQuit(wxCommandEvent& event);
  void OnReconnect(wxCommandEvent& event);
  void OnTimer(wxTimerEvent& event);

 DECLARE_EVENT_TABLE()
protected:
  wxButton *QuitButton_, *WhiteBalanceButton_;
  ImageCanvas *ic_;
  wxTimer      Timer_;
  VideoSource_V4L *cam; 
  Camera<unsigned char> pic;
  string device; 
  int framecount;
};


enum
{
  ID_Quit = 1,
  ID_BUTTON_QUIT,
  ID_Reconnect,
  ID_TIMER = 1001
};


BEGIN_EVENT_TABLE(MyFrame, wxFrame)
  EVT_MENU(ID_Quit, MyFrame::OnQuit)
  EVT_MENU(ID_Reconnect, MyFrame::OnReconnect)
  EVT_BUTTON(ID_BUTTON_QUIT, MyFrame::OnQuit)
  EVT_TIMER(ID_TIMER, MyFrame::OnTimer)
END_EVENT_TABLE()

IMPLEMENT_APP(MyApp)

bool MyApp::OnInit()
{
  MyFrame *frame = 
      new MyFrame( wxT("Example Video4Linux"), wxPoint(50,50), wxSize(800,600) );
  SetTopWindow(frame);  
  frame->Show(); 
  

  return TRUE;
}

MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
  : wxFrame((wxFrame *)NULL, -1, title, pos, size)
{

  cam = new VideoSource_V4L;
  vector<string> devices;
  cam->GetAllDevices(devices);

  if (devices.size()==0) {
    cout <<"No V4L devices found"<<endl;
    exit(1);
  }

  for ( unsigned d=0; d<devices.size(); d++ ) 
    cout <<"Foud V4L device: "<<devices[d]<<endl;

  device = devices[0];
  cout <<"Using: "<<device<<endl;
  VideoSourceCapabilities caps;
  if ( cam->GetCapabilities(device.c_str(),caps) == 0 ) {
    caps.Show();
    vector<VideoSourceCapabilities::ResolutionEntry> re;
    caps.GetBestForEachResolution(re);

    for (unsigned int i=0;i<re.size();i++){
        cout <<"  Best for "<<re[i].width<<"x"<<re[i].height<<" is "
                <<re[i].colormodel<<" at fps: "<<re[i].fps<<endl;
    }
  }
  else {
    cerr<<"failed to open "<<device<<endl;
    exit(1);
  }

  cam->SetSize(320,240);
  cam->SetColorModel(ImageBase::CM_YUYV422);
  int  res = cam->OpenDevice(device.c_str());
  if (res!=0) {
    cout<<"Failed to open device "<<device<<endl;
    exit(-1);
  } 
  cam->InitImage(pic);
  
  cam->PreGrab();
  cam->SetWaitForNew(false);

  framecount = 0;


  wxMenu *menuFile = new wxMenu;
  menuFile->Append( ID_Quit, wxT("E&xit") );
  menuFile->Append( ID_Reconnect, wxT("Reconnect") );

  wxMenuBar *menuBar = new wxMenuBar;
  menuBar->Append( menuFile, wxT("&File") );

  SetMenuBar( menuBar );
  wxStatusBar* s = CreateStatusBar();
  SetStatusText( wxT("") );

  wxSizer *Sizer = new wxBoxSizer( wxHORIZONTAL );

  ic_ = new ImageCanvas(this,s,0,-1,wxDefaultPosition,wxSize(640,480));  

  Sizer->Add(ic_,1,wxEXPAND);
  SetSizer( Sizer );
  Layout();
 
  ic_->Show(pic,"foo");
  Timer_.SetOwner(this, ID_TIMER);



  Timer_.Start(100, true);
}

void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
{
  Timer_.Stop();
  usleep(500000);
  cam->PostGrab();
  cam->CloseDevice();
  Close(TRUE);
}

void MyFrame::OnReconnect(wxCommandEvent& WXUNUSED(event))
{
  Timer_.Stop();
  usleep(500000);
  // cam->PostGrab();
  cam->CloseDevice();

  delete cam;

  cam = new VideoSource_V4L;
  vector<string> devs;
  cam->GetAllDevices(devs);
  VideoSourceCapabilities caps;
  
  cam->GetCapabilities(devs[0].c_str(),caps);
  cam->OpenDevice(device.c_str());
  cam->InitImage(pic);
  cam->PreGrab();
  cam->SetWaitForNew(false);
  Timer_.Start(100,true);
}



void MyFrame::OnTimer(wxTimerEvent& event)
{
  cam->GrabSingle(pic);
  char name[255];
  sprintf(name,"image_%04i",imgNo);
  SetStatusText(AsciiToWx(name));
  BIAS::UUID uid;

  // evil, evil, evil: using false corrupts the videosource !!!
  uid.AssignUUID(true);

  ic_->Show(pic,name);
 //  Image<unsigned char> rgb;
 //  ImageConvert::ToRGB(pic,rgb);
 // BIAS::ImageIO::Save(name,rgb,ImageIO::FF_jpg);
 //  cout<<"Written image:"<<name<<" to disk"<<endl;
  Refresh();
  imgNo++;
  Timer_.Start(20, true); // grab new images every 20 ms = resp 50 Hz
}
/** \endcond */