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Sourcecode: vdr-plugin-live version File versions  Download package

grab.cpp

#include <cstdlib>
#include <vdr/device.h>
#include <vdr/tools.h>
#include "grab.h"

namespace vdrlive {

using namespace std;

const unsigned int GrabMinIntervalMs = 500; 
const unsigned int GrabPauseIntervalMs = GrabMinIntervalMs * 20;

class GrabImageTask: public StickyTask
{
public:
      explicit GrabImageTask( int quality = 80, int width = 320, int height = 240 )
            : m_firstTime( 0 )
            , m_lastTime( 0 )
            , m_quality( quality )
            , m_width( width )
            , m_height( height )
            {}

      void Activate() { m_firstTime = 0; }
      bool IsActive();

private:
      uint64_t m_firstTime;
      uint64_t m_lastTime;
      int m_quality;
      int m_width;
      int m_height;

      bool GrabImage();
      
      virtual void Action();
};

bool GrabImageTask::IsActive() 
{
      cMutexLock lock( &LiveTaskManager() );
      return GrabImage();
}

bool GrabImageTask::GrabImage()
{
      cDevice* device = cDevice::PrimaryDevice();
      if ( device == 0 ) {
            SetError( tr("Couldn't aquire primary device") );
            return false;
      }

      int size = 0;
      uchar* image = device->GrabImage( size, true, m_quality, m_width, m_height );
      if ( image == 0 ) {
            SetError( tr("Couldn't grab image from primary device") );
            return false;
      }

      LiveGrabImageManager().PutImage( reinterpret_cast< char* >( image ), size );
      return true;
}

void GrabImageTask::Action()
{
      uint64_t now = cTimeMs::Now();

      if ( m_firstTime == 0 )
            m_firstTime = now;

      if ( now - m_lastTime < GrabMinIntervalMs || now - m_firstTime > GrabPauseIntervalMs )
            return;

      if ( !GrabImage() )
            return;

      m_lastTime = now;
}

GrabImageManager::GrabImageManager()
            : m_task( new GrabImageTask )
            , m_size( 0 )
{
}

GrabImageInfo GrabImageManager::GetImage() const 
{
      cMutexLock lock( &LiveTaskManager() );
      m_task->Activate();
      return make_pair( m_image, m_size );
}

bool GrabImageManager::CanGrab() const 
{
      return m_task->IsActive();
}

void GrabImageManager::PutImage( char* image, int size )
{
      m_image.reset( image, &free );
      m_size = size;
}

GrabImageManager& LiveGrabImageManager() 
{
      static GrabImageManager instance;
      return instance;
}

} // namespace vdrlive

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