pxcgifff.cpp

linux下的一款播放器

            }
        }
    }

    return bRet;
}

STDMETHODIMP CRealPixGIFFileFormatCodec::ParseImage(IHXBuffer*      pBuffer,
                                                    REF(UINT32)      rulNumPackets,
                                                    REF(IHXValues*) rpParam,
                                                    REF(UINT32)      rulSessionHandle)
{
    HX_RESULT retVal = HXR_FAIL;

    if (pBuffer && m_pMapManager)
    {
        // Compute the maximum number of packets - since we will free up any unused memory
        // later, we will compute the absolute upper bound for the number of packets - the
        // number of GIF blocks in the image file. This is an upper bound since we don't
        // subdivide the file except at GIF block boundaries.
        UINT32 ulMaxNumPackets = CGIFCodec::GetMaxNumPackets(pBuffer->GetBuffer(), pBuffer->GetSize());

        // Create a PXParseSession object
        PXParseSession* pSession = new PXParseSession();
        if (pSession)
        {
            // AddRef the object
            pSession->AddRef();
            // Init the size
            retVal = pSession->InitSize(ulMaxNumPackets);
            if (SUCCEEDED(retVal))
            {
                // Parse the image, putting buffers into the session object
                HXxSize rImageDim;
                retVal = ParseBuffer(pBuffer, pSession, rImageDim);
                if (SUCCEEDED(retVal))
                {
                    // Now we can reduce our size to the number of packets we actually have
                    retVal = pSession->SetSize(pSession->GetNumPackets());
                    if (SUCCEEDED(retVal))
                    {
                        // Add the session to the map
                        retVal = m_pMapManager->AddEntry((void*) pSession, rulSessionHandle);
                        if (SUCCEEDED(retVal))
                        {
                            // AddRef the session now that it's in the map
                            pSession->AddRef();
                            // Create an IHXValues object
                            IHXValues* pParam = NULL;
                            retVal             = m_pCommonClassFactory->CreateInstance(CLSID_IHXValues,
                                                                                       (void**) &pParam);
                            if (SUCCEEDED(retVal))
                            {
                                // Set properties in the IHXValues
                                pParam->SetPropertyULONG32("MaxPacketSize",    pSession->GetMaxPacketSize());
                                pParam->SetPropertyULONG32("MinPacketSize",    pSession->GetMinPacketSize());
                                pParam->SetPropertyULONG32("TotalBytes",       pSession->GetTotalBytes());
                                pParam->SetPropertyULONG32("TotalReqBytes",    pSession->GetTotalRequiredBytes());
                                pParam->SetPropertyULONG32("TotalNonReqBytes", pSession->GetTotalNonRequiredBytes());
                                pParam->SetPropertyULONG32("ImageWidth",       (UINT32) rImageDim.cx);
                                pParam->SetPropertyULONG32("ImageHeight",      (UINT32) rImageDim.cy);
                                // Set the outgoing parameters
                                rulNumPackets = pSession->GetNumPackets();
                                HX_RELEASE(rpParam);
                                rpParam = pParam;
                                rpParam->AddRef();
                            }
                            HX_RELEASE(pParam);
                        }
                    }
                }
            }
        }
        else
        {
            retVal = HXR_OUTOFMEMORY;
        }
        HX_RELEASE(pSession);
    }
    else
    {
        retVal = HXR_INVALID_PARAMETER;
    }

    return retVal;
}

STDMETHODIMP CRealPixGIFFileFormatCodec::GetImagePacket(UINT32           ulSessionHandle,
                                                        UINT32           ulPacketNum,
                                                        REF(IHXBuffer*) rpPacketBuffer,
                                                        REF(IHXBuffer*) rpOpaquePacketData,
                                                        REF(BOOL)        rbRequired)
{
    HX_RESULT retVal = HXR_FAIL;

    if (m_pMapManager)
    {
        PXParseSession* pSession = NULL;
        retVal                   = m_pMapManager->GetEntry(ulSessionHandle, (void**) &pSession);
        if (SUCCEEDED(retVal))
        {
            retVal = pSession->GetPacket(ulPacketNum,
                                         rpPacketBuffer,
                                         rpOpaquePacketData,
                                         rbRequired);
        }
    }

    return retVal;
}

STDMETHODIMP CRealPixGIFFileFormatCodec::ReleaseImage(UINT32 ulSessionHandle)
{
    HX_RESULT retVal = HXR_FAIL;
    
    if (m_pMapManager)
    {
        PXParseSession* pSession = NULL;
        retVal                   = m_pMapManager->DeleteEntry(ulSessionHandle, (void**) &pSession);
        HX_RELEASE(pSession);
    }

    return retVal;
}

HX_RESULT STDAPICALLTYPE CRealPixGIFFileFormatCodec::HXCreateInstance(IUnknown** ppIUnknown)
{
    HX_RESULT retVal = HXR_OK;

    if (ppIUnknown)
    {
        // Create file format codec
        CRealPixGIFFileFormatCodec* pCodec = new CRealPixGIFFileFormatCodec();
        if (pCodec)
        {
            // QI for IUnknown
            retVal = pCodec->QueryInterface(IID_IUnknown, (void**) ppIUnknown);
        }
        else
        {
            retVal = HXR_OUTOFMEMORY;
        }
        if (FAILED(retVal))
        {
            HX_DELETE(pCodec);
        }
    }
    else
    {
        retVal = HXR_FAIL;
    }

    return retVal;
}

STDMETHODIMP CRealPixGIFFileFormatCodec::ParseBuffer(IHXBuffer*     pBuffer,
                                                     PXParseSession* pSession,
                                                     REF(HXxSize)    rImageDim)
{
    HX_RESULT retVal = HXR_OK;

    if (pBuffer && pSession)
    {
        // Create a new CGIFCodec object
        CGIFCodec* pCodec = NULL;
        retVal            = CGIFCodec::CreateObject(&pCodec);
        if (SUCCEEDED(retVal))
        {
            // AddRef the object
            pCodec->AddRef();
            // Initialize the codec for parsing
            retVal = pCodec->InitParseWireFormat(pBuffer->GetBuffer(), pBuffer->GetSize());
            if (SUCCEEDED(retVal))
            {
                UINT32 ulSeqNum = 0;
                BOOL   bFirst   = TRUE;
                while (SUCCEEDED(retVal) && !pCodec->ParseFinished())
                {
                    UINT32 ulSize = 0;
                    retVal = pCodec->GetPacketBufferLength(ulSize);
                    if (SUCCEEDED(retVal))
                    {
                        // Create an IHXBuffer
                        IHXBuffer* pData = NULL;
                        retVal            = m_pCommonClassFactory->CreateInstance(CLSID_IHXBuffer,
                                                                                  (void**) &pData);
                        if (SUCCEEDED(retVal))
                        {
                            // Set its size
                            retVal = pData->SetSize(ulSize);
                            if (SUCCEEDED(retVal))
                            {
                                BOOL bFirst = FALSE;
                                retVal = pCodec->GetPacketBuffer(pData->GetBuffer(),
                                                                 pData->GetSize(),
                                                                 bFirst);
                                if (SUCCEEDED(retVal))
                                {
                                    // Create an opaque data buffer
                                    IHXBuffer* pOpaque = NULL;
                                    retVal              = m_pCommonClassFactory->CreateInstance(CLSID_IHXBuffer,
                                                                                                (void**) &pOpaque);
                                    if (SUCCEEDED(retVal))
                                    {
                                        retVal = pOpaque->SetSize(8);
                                        if (SUCCEEDED(retVal))
                                        {
                                            UINT32 ulFlags = (bFirst ? 1 : 0);
                                            BYTE*  pBuf    = pOpaque->GetBuffer();
                                            Pack32(pBuf, ulSeqNum);
                                            Pack32(pBuf, ulFlags);

                                            // Add the buffers to the session
                                            retVal = pSession->AddPacket(pData, pOpaque, bFirst);
                                            if (SUCCEEDED(retVal))
                                            {
                                                ulSeqNum++;
                                            }
                                        }
                                    }
                                    HX_RELEASE(pOpaque);
                                }
                            }
                        }
                        HX_RELEASE(pData);
                    }
                }
            }
        }
        HX_RELEASE(pCodec);
    }
    else
    {
        retVal = HXR_INVALID_PARAMETER;
    }

    return retVal;
}

void CRealPixGIFFileFormatCodec::ReleaseAllSessions()
{
    if (m_pMapManager)
    {
        UINT32          ulHandle = 0;
        PXParseSession* pSession = NULL;
        HX_RESULT       retVal   = m_pMapManager->GetFirstEntry(ulHandle, (void**) &pSession);
        while (SUCCEEDED(retVal))
        {
            HX_RELEASE(pSession);
            retVal = m_pMapManager->GetNextEntry(ulHandle, (void**) &pSession);
        }
        m_pMapManager->DeleteAllEntries();
    }
}