//DirectShowVideo and ofDirectShowPlayer written by Theodore Watson, Jan 2014
//Code is based off of examples provided by MSDN, the videoInput library, http://www.codeproject.com/Articles/30450/A-simple-console-DirectShow-player 
//and http://www.geekpage.jp/en/programming/directshow/
//This code is free to be used in any manner with or without attribution. 
//No warrenty is offered or implied. 

#include "ofDirectShowPlayer.h"


//-------------------------------------------------------------------------------------------------------------------------------------------------------------
//-------------------------------------------------------------------------------------------------------------------------------------------------------------
// DirectShow includes and helper methods 
//-------------------------------------------------------------------------------------------------------------------------------------------------------------
//-------------------------------------------------------------------------------------------------------------------------------------------------------------


#include <DShow.h>
#pragma include_alias( "dxtrans.h", "qedit.h" )
#define __IDxtCompositor_INTERFACE_DEFINED__
#define __IDxtAlphaSetter_INTERFACE_DEFINED__
#define __IDxtJpeg_INTERFACE_DEFINED__
#define __IDxtKey_INTERFACE_DEFINED__
#include <uuids.h>
#include <Aviriff.h>
#include <Windows.h>

//for threading
#include <process.h>

// Due to a missing qedit.h in recent Platform SDKs, we've replicated the relevant contents here
// #include <qedit.h>
MIDL_INTERFACE("0579154A-2B53-4994-B0D0-E773148EFF85")
ISampleGrabberCB : public IUnknown
{
  public:
    virtual HRESULT STDMETHODCALLTYPE SampleCB( 
        double SampleTime,
        IMediaSample *pSample) = 0;
    
    virtual HRESULT STDMETHODCALLTYPE BufferCB( 
        double SampleTime,
        BYTE *pBuffer,
        long BufferLen) = 0;
    
};

MIDL_INTERFACE("6B652FFF-11FE-4fce-92AD-0266B5D7C78F")
ISampleGrabber : public IUnknown
{
  public:
    virtual HRESULT STDMETHODCALLTYPE SetOneShot( 
        BOOL OneShot) = 0;
    
    virtual HRESULT STDMETHODCALLTYPE SetMediaType( 
        const AM_MEDIA_TYPE *pType) = 0;
    
    virtual HRESULT STDMETHODCALLTYPE GetConnectedMediaType( 
        AM_MEDIA_TYPE *pType) = 0;
    
    virtual HRESULT STDMETHODCALLTYPE SetBufferSamples( 
        BOOL BufferThem) = 0;
    
    virtual HRESULT STDMETHODCALLTYPE GetCurrentBuffer( 
        /* [out][in] */ long *pBufferSize,
        /* [out] */ long *pBuffer) = 0;
    
    virtual HRESULT STDMETHODCALLTYPE GetCurrentSample( 
        /* [retval][out] */ IMediaSample **ppSample) = 0;
    
    virtual HRESULT STDMETHODCALLTYPE SetCallback( 
        ISampleGrabberCB *pCallback,
        long WhichMethodToCallback) = 0;
    
};
EXTERN_C const CLSID CLSID_SampleGrabber;
EXTERN_C const IID IID_ISampleGrabber;
EXTERN_C const CLSID CLSID_NullRenderer;

// GetUnconnectedPin   
//    Finds an unconnected pin on a filter in the desired direction   
HRESULT GetUnconnectedPin(   
                          IBaseFilter *pFilter,   // Pointer to the filter.   
                          PIN_DIRECTION PinDir,   // Direction of the pin to find.   
                          IPin **ppPin)           // Receives a pointer to the pin.   
{   
    *ppPin = 0;   
    IEnumPins *pEnum = 0;   
    IPin *pPin = 0;   
    HRESULT hr = pFilter->EnumPins(&pEnum);   
    if (FAILED(hr))   
    {   
        return hr;   
    }   
    while (pEnum->Next(1, &pPin, NULL) == S_OK)   
    {   
        PIN_DIRECTION ThisPinDir;   
        pPin->QueryDirection(&ThisPinDir);   
        if (ThisPinDir == PinDir)   
        {   
            IPin *pTmp = 0;   
            hr = pPin->ConnectedTo(&pTmp);   
            if (SUCCEEDED(hr))  // Already connected, not the pin we want.   
            {   
                pTmp->Release();   
            }   
            else  // Unconnected, this is the pin we want.   
            {   
                pEnum->Release();   
                *ppPin = pPin;   
                return S_OK;   
            }   
        }   
        pPin->Release();   
    }   
    pEnum->Release();   
    // Did not find a matching pin.   
    return E_FAIL;   
}   
 
// Disconnect any connections to the filter.   
HRESULT DisconnectPins(IBaseFilter *pFilter)   
{   
    IEnumPins *pEnum = 0;   
    IPin *pPin = 0;   
    HRESULT hr = pFilter->EnumPins(&pEnum);   
    if (FAILED(hr))   
    {   
        return hr;   
    }   
 
    while (pEnum->Next(1, &pPin, NULL) == S_OK)   
    {   
        pPin->Disconnect();   
        pPin->Release();   
    }   
    pEnum->Release();   
 
    // Did not find a matching pin.   
    return S_OK;   
}   
 
// ConnectFilters   
//    Connects a pin of an upstream filter to the pDest downstream filter   
HRESULT ConnectFilters(   
                       IGraphBuilder *pGraph, // Filter Graph Manager.   
                       IPin *pOut,            // Output pin on the upstream filter.   
                       IBaseFilter *pDest)    // Downstream filter.   
{   
    if ((pGraph == NULL) || (pOut == NULL) || (pDest == NULL))   
    {   
        return E_POINTER;   
    }   
#ifdef debug   
    PIN_DIRECTION PinDir;   
    pOut->QueryDirection(&PinDir);   
    _ASSERTE(PinDir == PINDIR_OUTPUT);   
#endif   
 
    // Find an input pin on the downstream filter.   
    IPin *pIn = 0;   
    HRESULT hr = GetUnconnectedPin(pDest, PINDIR_INPUT, &pIn);   
    if (FAILED(hr))   
    {   
        return hr;   
    }   
    // Try to connect them.   
    hr = pGraph->Connect(pOut, pIn);   
    pIn->Release();   
    return hr;   
}   
 
 
 
// ConnectFilters   
//    Connects two filters   
HRESULT ConnectFilters(   
                       IGraphBuilder *pGraph,    
                       IBaseFilter *pSrc,    
                       IBaseFilter *pDest)   
{   
    if ((pGraph == NULL) || (pSrc == NULL) || (pDest == NULL))   
    {   
        return E_POINTER;   
    }   
 
    // Find an output pin on the first filter.   
    IPin *pOut = 0;   
    HRESULT hr = GetUnconnectedPin(pSrc, PINDIR_OUTPUT, &pOut);   
    if (FAILED(hr))    
    {   
        return hr;   
    }   
    hr = ConnectFilters(pGraph, pOut, pDest);   
    pOut->Release();   
    return hr;   
}   
 
// LocalFreeMediaType   
//    Free the format buffer in the media type   
void LocalFreeMediaType(AM_MEDIA_TYPE& mt)   
{   
    if (mt.cbFormat != 0)   
    {   
        CoTaskMemFree((PVOID)mt.pbFormat);   
        mt.cbFormat = 0;   
        mt.pbFormat = NULL;   
    }   
    if (mt.pUnk != NULL)   
    {   
        // Unecessary because pUnk should not be used, but safest.   
        mt.pUnk->Release();   
        mt.pUnk = NULL;   
    }   
}   
 
// LocalDeleteMediaType   
//    Free the format buffer in the media type,    
//    then delete the MediaType ptr itself   
void LocalDeleteMediaType(AM_MEDIA_TYPE *pmt)   
{   
    if (pmt != NULL)   
    {   
        LocalFreeMediaType(*pmt); // See FreeMediaType for the implementation.   
        CoTaskMemFree(pmt);   
    }   
}


HRESULT SaveGraphFile(IGraphBuilder *pGraph, WCHAR *wszPath) 
{
    const WCHAR wszStreamName[] = L"ActiveMovieGraph"; 
    HRESULT hr;
    
    IStorage *pStorage = NULL;
    hr = StgCreateDocfile(
        wszPath,
        STGM_CREATE | STGM_TRANSACTED | STGM_READWRITE | STGM_SHARE_EXCLUSIVE,
        0, &pStorage);
    if(FAILED(hr)) 
    {
        return hr;
    }

    IStream *pStream;
    hr = pStorage->CreateStream(
        wszStreamName,
        STGM_WRITE | STGM_CREATE | STGM_SHARE_EXCLUSIVE,
        0, 0, &pStream);
    if (FAILED(hr)) 
    {
        pStorage->Release();    
        return hr;
    }

    IPersistStream *pPersist = NULL;
    pGraph->QueryInterface(IID_IPersistStream, (void**)&pPersist);
    hr = pPersist->Save(pStream, TRUE);
    pStream->Release();
    pPersist->Release();
    if (SUCCEEDED(hr)) 
    {
        hr = pStorage->Commit(STGC_DEFAULT);
    }
    pStorage->Release();
    return hr;
}

//-------------------------------------------------------------------------------------------------------------------------------------------------------------
//-------------------------------------------------------------------------------------------------------------------------------------------------------------
// DirectShowVideo - contains a simple directshow video player implementation
//-------------------------------------------------------------------------------------------------------------------------------------------------------------
//-------------------------------------------------------------------------------------------------------------------------------------------------------------

static int comRefCount = 0; 

static void retainCom(){
    if( comRefCount == 0 ){
        //printf("com is initialized!\n"); 
        CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);     
    }
    comRefCount++;
}

static void releaseCom(){
    comRefCount--; 
    if( comRefCount == 0 ){
        //printf("com is uninitialized!\n"); 
        CoUninitialize();
    }
}

class DirectShowVideo : public ISampleGrabberCB{
    public:

    DirectShowVideo(){
        retainCom();
        clearValues();
        InitializeCriticalSection(&critSection);
    }

    ~DirectShowVideo(){
        tearDown();
        releaseCom(); 
        DeleteCriticalSection(&critSection);
    }

    void tearDown(){
        //printf("tearDown\n"); 

        if(m_pControl){
            m_pControl->Release();
        }
        if(m_pEvent){
            m_pEvent->Release();
        }
        if(m_pSeek){
            m_pSeek->Release();
        }
        if(m_pAudio){
            m_pAudio->Release();
        }
        if(m_pBasicVideo){
            m_pBasicVideo->Release();
        }
        if(m_pGrabber){
            m_pGrabber->Release();
        }
        if(m_pGrabberF){
            m_pGrabberF->Release();
        }
        if(m_pGraph){
            m_pGraph->Release();
        }
        if(m_pNullRenderer){
            m_pNullRenderer->Release();
        }
        if( m_pSourceFile ){
            m_pSourceFile->Release();
        }
        if( m_pPosition ){
            m_pPosition->Release();
        }
        
        if(rawBuffer){
            delete rawBuffer;
        }
        clearValues(); 
    }

    void clearValues(){
        hr = 0;

        m_pGraph = NULL;
        m_pControl = NULL; 
        m_pEvent = NULL; 
        m_pSeek = NULL; 
        m_pAudio = NULL; 
        m_pGrabber = NULL;
        m_pGrabberF = NULL;
        m_pBasicVideo = NULL;
        m_pNullRenderer = NULL;
        m_pSourceFile = NULL;
        m_pPosition = NULL;

        rawBuffer = NULL;

        timeNow = 0; 
        lPositionInSecs = 0; 
        lDurationInNanoSecs = 0; 
        lTotalDuration = 0; 
        rtNew = 0; 
        lPosition = 0; 
        lvolume = -1000;
        evCode = 0; 
        width = height = 0; 
        videoSize = 0;
        bVideoOpened = false;    
        bLoop = true;
        bPaused = false;
        bPlaying = false;
        bEndReached = false; 
        bNewPixels = false;
        bFrameNew = false;
        curMovieFrame = -1; 
        frameCount = -1;

        movieRate = 1.0; 
        averageTimePerFrame = 1.0/30.0;
    }

    //------------------------------------------------
    STDMETHODIMP_(ULONG) AddRef() { return 1; }
    STDMETHODIMP_(ULONG) Release() { return 2; }


    //------------------------------------------------
    STDMETHODIMP QueryInterface(REFIID riid, void **ppvObject){
        *ppvObject = static_cast<ISampleGrabberCB*>(this);
        return S_OK;
    }


    //------------------------------------------------
    STDMETHODIMP SampleCB(double Time, IMediaSample *pSample){

        BYTE * ptrBuffer = NULL; 
        HRESULT hr = pSample->GetPointer(&ptrBuffer);

        if(hr == S_OK){
            long latestBufferLength = pSample->GetActualDataLength();
            if(latestBufferLength == videoSize ){
                EnterCriticalSection(&critSection);
                memcpy(rawBuffer, ptrBuffer, latestBufferLength);
                bNewPixels = true;

                //this is just so we know if there is a new frame
                frameCount++;

                LeaveCriticalSection(&critSection);
            }else{
                printf("ERROR: SampleCB() - buffer sizes do not match\n");
            }
        }

        return S_OK;
    }

    //This method is meant to have more overhead
    STDMETHODIMP BufferCB(double Time, BYTE *pBuffer, long BufferLen){
        return E_NOTIMPL;
    }

    bool loadMovie(string path){
        tearDown();


    // Create the Filter Graph Manager and query for interfaces.

        //printf("step 1\n"); 
        hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER,IID_IGraphBuilder, (void **)&m_pGraph);
        if (FAILED(hr)){
            tearDown(); 
            return false;
        }

        //printf("step 2\n"); 
        hr = m_pGraph->QueryInterface(IID_IMediaSeeking, (void**)&m_pSeek);
        if (FAILED(hr)){
            tearDown(); 
            return false;
        }

        hr = m_pGraph->QueryInterface(IID_IMediaPosition, (LPVOID *)&m_pPosition);
        if (FAILED(hr)){
            tearDown(); 
            return false;
        }

        hr = m_pGraph->QueryInterface(IID_IBasicAudio,(void**)&m_pAudio);
        if (FAILED(hr)){
            tearDown(); 
            return false;
        }

        // Use IGraphBuilder::QueryInterface (inherited from IUnknown) to get the IMediaControl interface.
        //printf("step 4\n"); 
        hr = m_pGraph->QueryInterface(IID_IMediaControl, (void **)&m_pControl);
        if (FAILED(hr)){
            tearDown(); 
            return false;
        }  
    
        // And get the Media Event interface, too.
        //printf("step 5\n"); 
        hr = m_pGraph->QueryInterface(IID_IMediaEvent, (void **)&m_pEvent);
        if (FAILED(hr)){
            tearDown(); 
            return false;
        } 

        //SAMPLE GRABBER (ALLOWS US TO GRAB THE BUFFER)//
        // Create the Sample Grabber.
        hr = CoCreateInstance(CLSID_SampleGrabber, NULL, CLSCTX_INPROC_SERVER,IID_IBaseFilter, (void**)&m_pGrabberF);
        if (FAILED(hr)){
            tearDown(); 
            return false;
        } 

        hr = m_pGraph->AddFilter(m_pGrabberF, L"Sample Grabber");
        if (FAILED(hr)){
            tearDown(); 
            return false;
        }

        hr = m_pGrabberF->QueryInterface(IID_ISampleGrabber, (void**)&m_pGrabber);
        if (FAILED(hr)){
            tearDown(); 
            return false;
        }

        m_pGrabber->SetCallback(this, 0);
        if (FAILED(hr)){
            tearDown(); 
            return false;
        }

        //MEDIA CONVERSION
        //Get video properties from the stream's mediatype and apply to the grabber (otherwise we don't get an RGB image)
        AM_MEDIA_TYPE mt;
        ZeroMemory(&mt,sizeof(AM_MEDIA_TYPE));

        mt.majortype    = MEDIATYPE_Video;
        mt.subtype      = MEDIASUBTYPE_RGB24;
        mt.formattype   = FORMAT_VideoInfo;

        //printf("step 5.5\n"); 
        hr = m_pGrabber->SetMediaType(&mt);
        if (FAILED(hr)){
            tearDown(); 
            return false;
        }

        //printf("step 6\n"); 
        std::wstring filePathW = std::wstring(path.begin(), path.end());

        //this is the easier way to connect the graph, but we have to remove the video window manually
        hr = m_pGraph->RenderFile(filePathW.c_str(), NULL);

        //this is the more manual way to do it - its a pain though because the audio won't be connected by default
        /*hr = m_pGraph->AddSourceFilter(filePathW.c_str(), L"Source", &m_pSourceFile); 
        if (FAILED(hr)){
            printf("unable to AddSourceFilter\n");
            tearDown(); 
            return false;
        }*/
        //hr = ConnectFilters(m_pGraph, m_pSourceFile, m_pGrabberF);
        //if (FAILED(hr)){
        //  printf("unable to ConnectFilters(m_pGraph, m_pSourceFile, m_pGrabberF)\n");
        //  tearDown(); 
        //  return false;
        //}

        //printf("step 7\n"); 
        if (SUCCEEDED(hr)){

            //Set Params - One Shot should be false unless you want to capture just one buffer
            hr = m_pGrabber->SetOneShot(FALSE);
            if (FAILED(hr)){
                printf("unable to set one shot\n");
                tearDown(); 
                return false;
            }

            hr = m_pGrabber->SetBufferSamples(TRUE);
            if (FAILED(hr)){
                printf("unable to set buffer samples\n");
                tearDown(); 
                return false;
            }

            //NULL RENDERER//
            //used to give the video stream somewhere to go to.
            hr = CoCreateInstance(CLSID_NullRenderer, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void**)(&m_pNullRenderer));
            if (FAILED(hr)){
                printf("null renderer error\n");
                tearDown(); 
                return false;
            }       

            hr = m_pGraph->AddFilter(m_pNullRenderer, L"Render");
            if (FAILED(hr)){
                printf("unable to add null renderer\n");
                tearDown(); 
                return false;
            }
            
            //hr = ConnectFilters(m_pGraph, m_pGrabberF, m_pNullRenderer);
            //if (FAILED(hr)){
            //  printf("unable to ConnectFilters(m_pGraph, m_pGrabberF, m_pNullRenderer)\n");
            //  tearDown(); 
            //  return false;
            //}
    
            AM_MEDIA_TYPE mt;
            ZeroMemory(&mt,sizeof(AM_MEDIA_TYPE));

            m_pGrabber->GetConnectedMediaType(&mt);
            if (FAILED(hr)){
                printf("unable to call GetConnectedMediaType\n");
                tearDown(); 
                return false;
            }

            VIDEOINFOHEADER * infoheader = (VIDEOINFOHEADER*)mt.pbFormat;
            width = infoheader->bmiHeader.biWidth;
            height = infoheader->bmiHeader.biHeight;
            averageTimePerFrame = infoheader->AvgTimePerFrame / 10000000.0;   

            videoSize = width * height * 3;
            //printf("video dimensions are %i %i\n", width, height); 

            //we need to manually change the output from the renderer window to the null renderer
            IBaseFilter * m_pVideoRenderer;
            IPin* pinIn = 0;
            IPin* pinOut = 0;

            IBaseFilter * m_pColorSpace;

            m_pGraph->FindFilterByName(L"Video Renderer", &m_pVideoRenderer);
            if (FAILED(hr)){
                printf("failed to find the video renderer\n");
                tearDown();
                return false;
            }

            //we disconnect the video renderer window by finding the output pin of the sample grabber
            hr = m_pGrabberF->FindPin(L"Out", &pinOut);
            if (FAILED(hr)){
                printf("failed to find the sample grabber output pin\n");
                tearDown();
                return false;
            }

            hr = pinOut->Disconnect();
            if (FAILED(hr)){
                printf("failed to disconnect grabber output pin\n");
                tearDown();
                return false;
            }

            //SaveGraphFile(m_pGraph, L"test1.grf");

            //we have to remove it as well otherwise the graph builder will reconnect it
            hr = m_pGraph->RemoveFilter(m_pVideoRenderer);
            if (FAILED(hr)){            
                printf("failed to remove the default renderer\n");
                tearDown();
                return false;
            }else{
                m_pVideoRenderer->Release();
            }

            //now connect the null renderer to the grabber output, if we don't do this not frames will be captured
            hr = m_pNullRenderer->FindPin(L"In", &pinIn);
            if (FAILED(hr)){            
                printf("failed to find the input pin of the null renderer\n");
                tearDown();
                return false;
            }

            hr = pinOut->Connect(pinIn, NULL);
            if (FAILED(hr)){            
                printf("failed to connect the null renderer\n");
                tearDown();
                return false;
            }

            //printf("step 8\n"); 
            // Run the graph.
        
            //SaveGraphFile(m_pGraph, L"test2.grf");
            hr = m_pControl->Run(); 
            //SaveGraphFile(m_pGraph, L"test3.grf");

            // Now pause the graph.
            hr = m_pControl->Stop();
            updatePlayState();

            if( FAILED(hr) || width == 0 || height == 0 ){
                tearDown();
                printf("Error occured while playing or pausing or opening the file\n");
                return false; 
            }else{
                rawBuffer = new unsigned char[videoSize];
                //printf("success!\n"); 
            }
        }else{
            tearDown();
            printf("Error occured while playing or pausing or opening the file\n");
            return false; 
        }

        bVideoOpened = true;
        return true; 
    }

    void update(){
        if( bVideoOpened ){

            long eventCode = 0;
#ifdef _WIN64
            long long ptrParam1 = 0;
            long long ptrParam2 = 0;
#else
            long ptrParam1 = 0;
            long ptrParam2 = 0;
#endif
            long timeoutMs = 2000;

            if( curMovieFrame != frameCount ){
                bFrameNew = true;
            }else{
                bFrameNew = false; 
            }
            curMovieFrame = frameCount;

            while (S_OK == m_pEvent->GetEvent(&eventCode, &ptrParam1, &ptrParam2, 0)){
                if (eventCode == EC_COMPLETE ){
                    if(bLoop){
                        //printf("Restarting!\n");
                        setPosition(0.0);
                    }else{
                        bEndReached = true; 
                        //printf("movie end reached!\n");
                        stop();
                        updatePlayState(); 
                    }
                }
                //printf("Event code: %#04x\n Params: %d, %d\n", eventCode, ptrParam1, ptrParam2);
                m_pEvent->FreeEventParams(eventCode, ptrParam1, ptrParam2);
            }
        }
    }

    bool isLoaded(){
        return bVideoOpened;
    }

    //volume has to be log corrected/converted
    void setVolume(float volPct){
        if( isLoaded() ){   
            if( volPct < 0 ) volPct = 0.0;
            if( volPct > 1 ) volPct = 1.0; 

            long vol = log10(volPct) * 4000.0; 
            m_pAudio->put_Volume(vol);
        }
    }

    float getVolume(){
        float volPct = 0.0;
        if( isLoaded() ){
            long vol = 0;
            m_pAudio->get_Volume(&vol);
            volPct = powf(10, (float)vol/4000.0);
        }
        return volPct;
    }

    double getDurationInSeconds(){
        if( isLoaded() ){
            long long lDurationInNanoSecs = 0;
            m_pSeek->GetDuration(&lDurationInNanoSecs);
            double timeInSeconds = (double)lDurationInNanoSecs/10000000.0;

            return timeInSeconds;
        }
        return 0.0;
    }

    double getCurrentTimeInSeconds(){
        if( isLoaded() ){
            long long lCurrentTimeInNanoSecs = 0;
            m_pSeek->GetCurrentPosition(&lCurrentTimeInNanoSecs);
            double timeInSeconds = (double)lCurrentTimeInNanoSecs/10000000.0;

            return timeInSeconds;
        }
        return 0.0;
    }

    void setPosition(float pct){
        if( bVideoOpened ){
            if( pct < 0.0 ) pct = 0.0; 
            if( pct > 1.0 ) pct = 1.0; 
            
            long long lDurationInNanoSecs = 0;
            m_pSeek->GetDuration(&lDurationInNanoSecs);

            rtNew = ((float)lDurationInNanoSecs * pct);             
            hr = m_pSeek->SetPositions(&rtNew, AM_SEEKING_AbsolutePositioning,NULL,AM_SEEKING_NoPositioning);
        }
    }

    float getPosition(){
        if( bVideoOpened ){
            float timeDur = getDurationInSeconds(); 
            if( timeDur > 0.0 ){
                return getCurrentTimeInSeconds() / timeDur; 
            }
        }
        return 0.0; 
    }

    void setSpeed(float speed){
        if( bVideoOpened ){
            m_pPosition->put_Rate(speed);
            m_pPosition->get_Rate(&movieRate);
        }
    }

    double getSpeed(){
        return movieRate;
    }

    void processPixels(unsigned char * src, unsigned char * dst, int width, int height, bool bRGB, bool bFlip){

        int widthInBytes = width * 3;
        int numBytes = widthInBytes * height;

        if(!bRGB){

            int x = 0;
            int y = 0;

            if(bFlip){
                for(int y = 0; y < height; y++){
                    memcpy(dst + (y * widthInBytes), src + ( (height -y -1) * widthInBytes), widthInBytes);
                }

            }else{
                memcpy(dst, src, numBytes);
            }
        }else{
            if(bFlip){

                int x = 0;
                int y = (height - 1) * widthInBytes;
                src += y;

                for(int i = 0; i < numBytes; i+=3){
                    if(x >= width){
                        x = 0;
                        src -= widthInBytes*2;
                    }

                    *dst = *(src+2);
                    dst++;

                    *dst = *(src+1);
                    dst++;

                    *dst = *src;
                    dst++;

                    src+=3;
                    x++;
                }
            }
            else{
                for(int i = 0; i < numBytes; i+=3){
                    *dst = *(src+2);
                    dst++;

                    *dst = *(src+1);
                    dst++;

                    *dst = *src;
                    dst++;

                    src+=3;
                }
            }
        }
    }

    void play(){
        if( bVideoOpened ){
            m_pControl->Run(); 
            bEndReached = false; 
            updatePlayState();
        }
    }

    void stop(){
        if( bVideoOpened ){
            if( isPlaying() ){
                setPosition(0.0); 
            }
            m_pControl->Stop();
            updatePlayState();
        }
    }

    void setPaused(bool bPaused){
        if( bVideoOpened ){
            if( bPaused ){
                m_pControl->Pause(); 
            }else{
                m_pControl->Run(); 
            }
            updatePlayState();
        }
        
    }

    void updatePlayState(){
        if( bVideoOpened ){
            FILTER_STATE fs;
            hr = m_pControl->GetState(4000, (OAFilterState*)&fs);
            if(hr==S_OK){
                if( fs == State_Running ){
                    bPlaying = true; 
                    bPaused = false;
                }
                else if( fs == State_Paused ){
                    bPlaying = false;
                    bPaused = true;
                }else if( fs == State_Stopped ){
                    bPlaying = false;
                    bPaused = false;
                }
            }
        }
    }

    bool isPlaying(){
        return bPlaying;
    }

    bool isPaused(){
        return bPaused;
    }

    bool isLooping(){
        return bLoop; 
    }

    void setLoop(bool loop){
        bLoop = loop; 
    }

    bool isMovieDone(){
        return bEndReached;
    }

    float getWidth(){
        return width;
    }

    float getHeight(){
        return height;
    }

    bool isFrameNew(){
        return bFrameNew;
    }

    void nextFrame(){
        //we have to do it like this as the frame based approach is not very accurate
        if( bVideoOpened && ( isPlaying() || isPaused() ) ){
            int curFrame = getCurrentFrameNo();
            float curFrameF = curFrame; 
            for(int i = 1; i < 20; i++){
                setAproximateFrameF( curFrameF + 0.3 * (float)i );  
                if( getCurrentFrameNo() >= curFrame + 1 ){
                    break;
                }
            }
        }
    }

    void preFrame(){
        //we have to do it like this as the frame based approach is not very accurate
        if( bVideoOpened && ( isPlaying() || isPaused() ) ){
            int curFrame = getCurrentFrameNo();
            float curFrameF = curFrame; 
            for(int i = 1; i < 20; i++){
                setAproximateFrameF( curFrameF - 0.3 * (float)i );  
                if( getCurrentFrameNo() <= curFrame + 1 ){
                    break;
                }
            }
        }
    }

    void setAproximateFrameF(float frameF){
        if( bVideoOpened ){
            float pct = frameF / (float)getAproximateNoFrames();
            if( pct > 1.0 ) pct = 1.0; 
            if( pct < 0.0 ) pct = 0.0; 
            setPosition(pct); 
        }
    }

    void setAproximateFrame(int frame){
        if( bVideoOpened ){
            float pct = (float)frame / (float)getAproximateNoFrames();
            if( pct > 1.0 ) pct = 1.0; 
            if( pct < 0.0 ) pct = 0.0; 
            setPosition(pct); 
        }
    }

    int getCurrentFrameNo(){
        if( bVideoOpened ){
            return getPosition() * (float) getAproximateNoFrames(); 
        }
        return 0; 
    }

    int getAproximateNoFrames(){
        if( bVideoOpened && averageTimePerFrame > 0.0 ){
            return getDurationInSeconds() / averageTimePerFrame; 
        }
        return 0;
    }

    void getPixels(unsigned char * dstBuffer){
            
        if(bVideoOpened && bNewPixels){

            EnterCriticalSection(&critSection);
                processPixels(rawBuffer, dstBuffer, width, height, true, true);
                bNewPixels = false;
            LeaveCriticalSection(&critSection);

        }
    }

    //this is the non-callback approach
    //void getPixels(unsigned char * dstBuffer){
    //      
    //  if(bVideoOpened && isFrameNew()){
    //      long bufferSize = videoSize; 
    //      HRESULT hr = m_pGrabber->GetCurrentBuffer(&bufferSize, (long *)rawBuffer);
    //      
    //      if(hr==S_OK){
    //          if (videoSize == bufferSize){
    //              processPixels(rawBuffer, dstBuffer, width, height, true, true);
    //          }else{
    //              printf("ERROR: GetPixels() - bufferSizes do not match!\n");
    //          }
    //      }else{
    //          printf("ERROR: GetPixels() - Unable to get pixels for device  bufferSize = %i \n", bufferSize);
    //      }
    //  }
    //}

    protected:

    HRESULT hr;                         // COM return value
    IGraphBuilder *m_pGraph;        // Graph Builder interface
    IMediaControl *m_pControl;  // Media Control interface
    IMediaEvent   *m_pEvent;        // Media Event interface
    IMediaSeeking *m_pSeek;     // Media Seeking interface
    IMediaPosition * m_pPosition; 
    IBasicAudio   *m_pAudio;        // Audio Settings interface 
    ISampleGrabber * m_pGrabber;
    IBaseFilter * m_pSourceFile;
    IBaseFilter * m_pGrabberF; 
    IBasicVideo * m_pBasicVideo;
    IBaseFilter * m_pNullRenderer;

    REFERENCE_TIME timeNow;             // Used for FF & REW of movie, current time
    LONGLONG lPositionInSecs;       // Time in  seconds
    LONGLONG lDurationInNanoSecs;       // Duration in nanoseconds
    LONGLONG lTotalDuration;        // Total duration
    REFERENCE_TIME rtNew;               // Reference time of movie 
    long lPosition;                 // Desired position of movie used in FF & REW
    long lvolume;                   // The volume level in 1/100ths dB Valid values range from -10,000 (silence) to 0 (full volume), 0 = 0 dB -10000 = -100 dB 
    long evCode;                    // event variable, used to in file to complete wait.

    long width, height;
    long videoSize;

    double averageTimePerFrame; 

    bool bFrameNew;
    bool bNewPixels;
    bool bVideoOpened;
    bool bPlaying; 
    bool bPaused;
    bool bLoop; 
    bool bEndReached;
    double movieRate;
    int curMovieFrame;
    int frameCount;

    CRITICAL_SECTION critSection;
    unsigned char * rawBuffer;
};




//----------------------------------------------------------------------------------------------------------------------------------------------------------------
//----------------------------------------------------------------------------------------------------------------------------------------------------------------
// OF SPECIFIC IMPLEMENTATION BELOW 
//----------------------------------------------------------------------------------------------------------------------------------------------------------------
//----------------------------------------------------------------------------------------------------------------------------------------------------------------


ofDirectShowPlayer::ofDirectShowPlayer(){
    player = NULL;
}

ofDirectShowPlayer::~ofDirectShowPlayer(){
    close();
}

bool ofDirectShowPlayer::load(string path){
    path = ofToDataPath(path); 

    close();
    player = new DirectShowVideo();
    return player->loadMovie(path); 
}

void ofDirectShowPlayer::close(){
    if( player ){
        delete player;
        player = NULL;
    }
}

void ofDirectShowPlayer::update(){
    if( player && player->isLoaded() ){
        player->update();
        
        if( pix.getWidth() != player->getWidth() ){
            pix.allocate(player->getWidth(), player->getHeight(), OF_IMAGE_COLOR);
        }

        player->getPixels(pix.getPixels());
    }
}

void ofDirectShowPlayer::play(){
    if( player && player->isLoaded() ){
        player->play();
    }
}

void ofDirectShowPlayer::stop(){
    if( player && player->isLoaded() ){
        player->stop();
    }
}       
    
bool ofDirectShowPlayer::isFrameNew() const{
    return ( player && player->isFrameNew() ); 
}

const ofPixels & ofDirectShowPlayer::getPixels() const{
    return pix;
}

ofPixels & ofDirectShowPlayer::getPixels(){
    return pix;
}

float ofDirectShowPlayer::getWidth() const{
    if( player && player->isLoaded() ){
        return player->getWidth();
    }
    return 0.0; 
}

float ofDirectShowPlayer::getHeight() const{
    if( player && player->isLoaded() ){
        return player->getHeight();
    }
    return 0.0;
}
    
bool ofDirectShowPlayer::isPaused() const{
    return ( player && player->isPaused() ); 
}

bool ofDirectShowPlayer::isLoaded() const{
    return ( player && player->isLoaded() ); 
}

bool ofDirectShowPlayer::isPlaying() const{
    return ( player && player->isPlaying() ); 
}   

bool ofDirectShowPlayer::setPixelFormat(ofPixelFormat pixelFormat){
    return (pixelFormat == OF_PIXELS_RGB);
}

ofPixelFormat ofDirectShowPlayer::getPixelFormat() const{
    return OF_PIXELS_RGB; 
}
        
//should implement!
float ofDirectShowPlayer::getPosition() const{
    if( player && player->isLoaded() ){
        return player->getPosition();
    }
    return 0.0;
}

float ofDirectShowPlayer::getSpeed() const{
    if( player && player->isLoaded() ){
        return player->getSpeed();
    }
    return 0.0; 
}

float ofDirectShowPlayer::getDuration() const{
    if( player && player->isLoaded() ){
        return player->getDurationInSeconds();
    }
    return 0.0;
}


bool ofDirectShowPlayer::getIsMovieDone() const{
    return ( player && player->isMovieDone() ); 
}
    
void ofDirectShowPlayer::setPaused(bool bPause){
    if( player && player->isLoaded() ){
        player->setPaused(bPause);
    }
}

void ofDirectShowPlayer::setPosition(float pct){
    if( player && player->isLoaded() ){
        player->setPosition(pct);
    }
}

void ofDirectShowPlayer::setVolume(float volume){
    if( player && player->isLoaded() ){
        player->setVolume(volume);
    }
}

void ofDirectShowPlayer::setLoopState(ofLoopType state){
    if( player ){
        if( state == OF_LOOP_NONE ){
            player->setLoop(false);
        }
        else if( state == OF_LOOP_NORMAL ){
            player->setLoop(true);
        }else{
            ofLogError("ofDirectShowPlayer") << " cannot set loop of type palindrome " << endl;
        }
    }
}

void ofDirectShowPlayer::setSpeed(float speed){
    if( player && player->isLoaded() ){
        player->setSpeed(speed); 
    }
}
    
int ofDirectShowPlayer::getCurrentFrame() const{
    if( player && player->isLoaded() ){
        return player->getCurrentFrameNo();
    }
    return 0; 
}

int ofDirectShowPlayer::getTotalNumFrames() const{
    if( player && player->isLoaded() ){
        return player->getAproximateNoFrames();
    }
    return 0; 
}

ofLoopType ofDirectShowPlayer::getLoopState() const{
    if( player ){
        if( player->isLooping() ){
            return OF_LOOP_NORMAL;
        }
        
    }
    return OF_LOOP_NONE; 
}

void ofDirectShowPlayer::setFrame(int frame){
    if( player && player->isLoaded() ){
        frame = ofClamp(frame, 0, getTotalNumFrames()); 
        return player->setAproximateFrame(frame);
    }
}  // frame 0 = first frame...
    
void ofDirectShowPlayer::firstFrame(){
    setPosition(0.0); 
}

void ofDirectShowPlayer::nextFrame(){
    if( player && player->isLoaded() ){
        player->nextFrame();
    }
}

void ofDirectShowPlayer::previousFrame(){
    if( player && player->isLoaded() ){
        player->preFrame();
    }
}
