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#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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