計算Frame Rate

Sample code:

    class CVideoPlayer
    {
         /* ... */

        protected:
                int m_FrameCount;
                DWORD m_dwOldTime,m_dwTimeElapsed;

        /* ... */

    };       

void CVideoPlayer::OnPlay()
{

        /* ... */      

        // Use to calculate the frame rate
        m_dwOldTime = GetTickCount();

}

void CVideoPlayer::DisplayVideo(BYTE *data,int size)
{

        /* ... */

         m_FrameCount++;
        if ( (GetTickCount() - m_dwOldTime) > 1000 ) {
                // Display frame rate : m_FrameCount

                m_dwOldTime = GetTickCount();
                m_FrameCount = 0;
        }

}

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Written By James Liang @ 2007/02/13