/*
| ==============================================================================
| Copyright (C) 2006-2011 Allied Vision Technologies.  All Rights Reserved.
|
| This code may be used in part, or in whole for your application development.
|
|==============================================================================
|
| Stream 
|
| Circular frame queue of FRAMESCOUNT size, used to continuously stream from camera.
|
| -Opens the first camera found. 
| -Queues FRAMESCOUNT number of frames, each with a frame callback function. 
| -Sets camera to freerun continuous mode. 
| -Main thread blocks until Ctrl+C input.
| -Frame callback function displays info on returned frame and requeues frame. 
|
|==============================================================================
|
| THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
| WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF TITLE,
| NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR  PURPOSE ARE
| DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
| INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
| LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
| OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED  AND ON ANY THEORY OF
| LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
| NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
| EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|==============================================================================
*/

#ifdef _WINDOWS
#include "StdAfx.h"
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#ifdef _WINDOWS
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
#endif

#if defined(_LINUX) || defined(_QNX) || defined(_OSX)
#include <unistd.h>
#include <time.h>
#include <signal.h>
#endif

#include <PvApi.h>

#ifdef _WINDOWS
#define _STDCALL __stdcall
#else
#define _STDCALL
#define TRUE     0
#endif

#define FRAMESCOUNT 15

typedef struct 
{
    unsigned long   UID;
    tPvHandle       Handle;
    tPvFrame        Frames[FRAMESCOUNT];
    bool            Abort;

} tCamera;

// global camera data
tCamera GCamera;

#if defined(_LINUX) || defined(_QNX) || defined(_OSX)
//Define function equivalent to Windows Sleep
void Sleep(unsigned int time)
{
    struct timespec t,r;
    
    t.tv_sec    = time / 1000;
    t.tv_nsec   = (time % 1000) * 1000000;    
    
    while(nanosleep(&t,&r)==-1)
        t = r;
}

//Define function equivalent to Windows SetConsoleCtrlHandler 
void SetConsoleCtrlHandler(void (*func)(int), int junk)
{
    signal(SIGINT, func);
}
#endif

// CTRL+C handler
#ifdef _WINDOWS
BOOL WINAPI CtrlCHandler(DWORD dwCtrlType)
#else
void CtrlCHandler(int Signo)
#endif  
{
    printf("Ctrl+C interrupt received, stopping camera.\n");    
    
	//Set flag to exit WaitForEver
    GCamera.Abort = true;    
        
    #ifndef _WINDOWS
    signal(SIGINT, CtrlCHandler);
    #else
    return true;
    #endif
}

// wait for a camera to be plugged in
void WaitForCamera()
{
    printf("Waiting for a camera");
    while((PvCameraCount() == 0) && !GCamera.Abort)
	{
		printf(".");
		Sleep(250);
	}
    printf("\n");
}

// wait until ctrl+C abort, or cam unplugged
void WaitForEver()
{
    tPvUint32 exposureVal;
	
	//Lazy/poor way to check for unplugged camera. See StreamPnp for 
	//registering a ePvLinkRemove callback.
	while((PvAttrUint32Get(GCamera.Handle, "ExposureValue", &exposureVal) != ePvErrUnplugged) && !GCamera.Abort)
		Sleep(500);
}

// Frame completed callback executes on seperate driver thread.
// One callback thread per camera. If a frame callback function has not 
// completed, and the next frame returns, the next frame's callback function is queued. 
// This situation is best avoided (camera running faster than host can process frames). 
// Spend as little time in this thread as possible and offload processing
// to other threads or save processing until later.
//
// Note: If a camera is unplugged, this callback will not get called until PvCaptureQueueClear.
// i.e. callback with pFrame->Status = ePvErrUnplugged doesn't happen -- so don't rely
// on this as a test for a missing camera. 
void _STDCALL FrameDoneCB(tPvFrame* pFrame)
{
    //Do something with the frame.
	//E.g. display to screen, shift pFrame->ImageBuffer location for later usage , etc
	//Here we display FrameCount and Status
	if (pFrame->Status == ePvErrSuccess)
		printf("Frame: %u returned successfully\n", pFrame->FrameCount);
	else if (pFrame->Status == ePvErrDataMissing)
		//Possible improper network card settings. See GigE Installation Guide.
		printf("Frame: %u dropped packets\n", pFrame->FrameCount);
	else if (pFrame->Status == ePvErrCancelled)
		printf("Frame cancelled %u\n", pFrame->FrameCount);
	else
		printf("Frame: %u Error: %u\n", pFrame->FrameCount, pFrame->Status);

	// if frame hasn't been cancelled, requeue frame
    if(pFrame->Status != ePvErrCancelled)
		PvCaptureQueueFrame(GCamera.Handle,pFrame,FrameDoneCB);
}

// get the first camera found
// return value: true == success, false == fail
bool CameraGet()
{
    tPvUint32 count,connected;
    tPvCameraInfoEx list;

    //regardless if connected > 1, we only set UID of first camera in list
	count = PvCameraListEx(&list,1,&connected, sizeof(tPvCameraInfoEx));
    if(count == 1)
    {
        GCamera.UID = list.UniqueId;
        printf("Got camera %s\n",list.SerialNumber);
        return true;
    }
    else
	{
		printf("CameraGet: Failed to find a camera\n");
		return false;
	}
}

// open camera, allocate memory
// return value: true == success, false == fail
bool CameraSetup()
{
    tPvErr errCode;
	bool failed = false;
	unsigned long FrameSize = 0;

	//open camera
	if ((errCode = PvCameraOpen(GCamera.UID,ePvAccessMaster,&(GCamera.Handle))) != ePvErrSuccess)
	{
		if (errCode == ePvErrAccessDenied)
			printf("PvCameraOpen returned ePvErrAccessDenied:\nCamera already open as Master, or camera wasn't properly closed and still waiting to HeartbeatTimeout.");
		else
			printf("PvCameraOpen err: %u\n", errCode);
		return false;
	}

	// Calculate frame buffer size
    if((errCode = PvAttrUint32Get(GCamera.Handle,"TotalBytesPerFrame",&FrameSize)) != ePvErrSuccess)
	{
		printf("CameraSetup: Get TotalBytesPerFrame err: %u\n", errCode);
		return false;
	}

	// allocate the frame buffers
    for(int i=0;i<FRAMESCOUNT && !failed;i++)
    {
        GCamera.Frames[i].ImageBuffer = new char[FrameSize];
        if(GCamera.Frames[i].ImageBuffer)
        {
			GCamera.Frames[i].ImageBufferSize = FrameSize;
		}
        else
		{
			printf("CameraSetup: Failed to allocate buffers.\n");
			failed = true;
		}
    }

	return !failed;
}

// close camera, free memory.
void CameraUnsetup()
{
    tPvErr errCode;
	
    if((errCode = PvCameraClose(GCamera.Handle)) != ePvErrSuccess)
	{
		printf("CameraUnSetup: PvCameraClose err: %u\n", errCode);
	}
	else
	{
		printf("Camera closed.\n");
	}
	// delete image buffers
    for(int i=0;i<FRAMESCOUNT;i++)
        delete [] (char*)GCamera.Frames[i].ImageBuffer;

    GCamera.Handle = NULL;
}


// setup and start streaming
// return value: true == success, false == fail
bool CameraStart()
{
    tPvErr errCode;
	bool failed = false;

    // NOTE: This call sets camera PacketSize to largest sized test packet, up to 8228, that doesn't fail
	// on network card. Some MS VISTA network card drivers become unresponsive if test packet fails. 
	// Use PvUint32Set(handle, "PacketSize", MaxAllowablePacketSize) instead. See network card properties
	// for max allowable PacketSize/MTU/JumboFrameSize. 
	if((errCode = PvCaptureAdjustPacketSize(GCamera.Handle,8228)) != ePvErrSuccess)
	{
		printf("CameraStart: PvCaptureAdjustPacketSize err: %u\n", errCode);
		return false;
	}

    // start driver capture stream 
	if((errCode = PvCaptureStart(GCamera.Handle)) != ePvErrSuccess)
	{
		printf("CameraStart: PvCaptureStart err: %u\n", errCode);
		return false;
	}
	
    // queue frames with FrameDoneCB callback function. Each frame can use a unique callback function
	// or, as in this case, the same callback function.
	for(int i=0;i<FRAMESCOUNT && !failed;i++)
	{           
		if((errCode = PvCaptureQueueFrame(GCamera.Handle,&(GCamera.Frames[i]),FrameDoneCB)) != ePvErrSuccess)
		{
			printf("CameraStart: PvCaptureQueueFrame err: %u\n", errCode);
			// stop driver capture stream
			PvCaptureEnd(GCamera.Handle);
			failed = true;
		}
	}

	if (failed)
		return false;
		
	// set the camera in freerun trigger, continuous mode, and start camera receiving triggers
	if((PvAttrEnumSet(GCamera.Handle,"FrameStartTriggerMode","Freerun") != ePvErrSuccess) ||
		(PvAttrEnumSet(GCamera.Handle,"AcquisitionMode","Continuous") != ePvErrSuccess) ||
		(PvCommandRun(GCamera.Handle,"AcquisitionStart") != ePvErrSuccess))
	{		
		printf("CameraStart: failed to set camera attributes\n");
		// clear queued frame
		PvCaptureQueueClear(GCamera.Handle);
		// stop driver capture stream
		PvCaptureEnd(GCamera.Handle);
		return false;
	}	

	return true;
}


// stop streaming
void CameraStop()
{
    tPvErr errCode;
	
	//stop camera receiving triggers
	if ((errCode = PvCommandRun(GCamera.Handle,"AcquisitionStop")) != ePvErrSuccess)
		printf("AcquisitionStop command err: %u\n", errCode);
	else
		printf("AcquisitionStop success.\n");
    
	//PvCaptureQueueClear aborts any actively written frame with Frame.Status = ePvErrDataMissing
	//Further queued frames returned with Frame.Status = ePvErrCancelled
	
	//Add delay between AcquisitionStop and PvCaptureQueueClear
	//to give actively written frame time to complete
	Sleep(200);
	
	printf("Calling PvCaptureQueueClear...\n");
	if ((errCode = PvCaptureQueueClear(GCamera.Handle)) != ePvErrSuccess)
		printf("PvCaptureQueueClear err: %u\n", errCode);
	else
		printf("...Queue cleared.\n");  

	//stop driver stream
	if ((errCode = PvCaptureEnd(GCamera.Handle)) != ePvErrSuccess)
		printf("PvCaptureEnd err: %u\n", errCode);
	else
		printf("Driver stream stopped.\n");
}


int main(int argc, char* argv[])
{
    tPvErr errCode;
	
	// initialize the PvAPI
	if((errCode = PvInitialize()) != ePvErrSuccess)
    { 
		printf("PvInitialize err: %u\n", errCode);
	}
	else
	{
        //IMPORTANT: Initialize camera structure. See tPvFrame in PvApi.h for more info.
		memset(&GCamera,0,sizeof(tCamera));

		//Set function to handle ctrl+C
		SetConsoleCtrlHandler(CtrlCHandler, TRUE);

        // wait for a camera to be plugged in
        WaitForCamera();

        // get first camera found
        if(CameraGet() && !GCamera.Abort)
        {
            // open camera
            if(CameraSetup())
            {
                // start streaming from the camera
                if(CameraStart())
                {
                    printf("Camera is streaming. Press CTRL-C to terminate\n");
                    
					// Block main thread until CTRL-C, or camera unplugged. 
					// All frame management/requeueing handled by
					// FrameDoneCB on camera callback thread.
                    WaitForEver();

                    // stop the camera
                    CameraStop();                     
                }        
                // close camera
                CameraUnsetup();
            }
        }        
       
        // uninitialize PvAPI
        PvUnInitialize();
    }
    
	return 0;
}