예제 #1
0
        // Open an AVI file
        public void Open(string fname)
        {
            // close previous file
            Close();

            // open file
            if (Win32.AVIFileOpen(out file, fname, Win32.OpenFileMode.ShareDenyWrite, IntPtr.Zero) != 0)
            {
                throw new ApplicationException("Failed opening file");
            }

            // get first video stream
            if (Win32.AVIFileGetStream(file, out stream, Win32.mmioFOURCC("vids"), 0) != 0)
            {
                throw new ApplicationException("Failed getting video stream");
            }

            // get stream info
            Win32.AVISTREAMINFO info = new Win32.AVISTREAMINFO();
            Win32.AVIStreamInfo(stream, ref info, Marshal.SizeOf(info));

            width    = info.rcFrame.right;
            height   = info.rcFrame.bottom;
            position = info.dwStart;
            start    = info.dwStart;
            length   = info.dwLength;
            rate     = (float)info.dwRate / (float)info.dwScale;
            codec    = Win32.decode_mmioFOURCC(info.fccHandler);

            // prepare decompressor
            Win32.BITMAPINFOHEADER bih = new Win32.BITMAPINFOHEADER();

            bih.biSize        = Marshal.SizeOf(bih.GetType());
            bih.biWidth       = width;
            bih.biHeight      = height;
            bih.biPlanes      = 1;
            bih.biBitCount    = 24;
            bih.biCompression = 0;                   // BI_RGB

            // get frame open object
            if ((getFrame = Win32.AVIStreamGetFrameOpen(stream, ref bih)) == IntPtr.Zero)
            {
                bih.biHeight = -height;

                if ((getFrame = Win32.AVIStreamGetFrameOpen(stream, ref bih)) == IntPtr.Zero)
                {
                    throw new ApplicationException("Failed initializing decompressor");
                }
            }
        }
        // Create new AVI file
        public void Open(string fname, int width, int height)
        {
            // close previous file
            Close();

            // calculate stride
            stride = width * 3;
            int r = stride % 4;

            if (r != 0)
            {
                stride += (4 - r);
            }

            // create new file
            if (Win32.AVIFileOpen(out file, fname, Win32.OpenFileMode.Create | Win32.OpenFileMode.Write, IntPtr.Zero) != 0)
            {
                throw new ApplicationException("Failed opening file");
            }

            this.width  = width;
            this.height = height;

            // describe new stream
            Win32.AVISTREAMINFO info = new Win32.AVISTREAMINFO();

            info.fccType               = Win32.mmioFOURCC("vids");
            info.fccHandler            = Win32.mmioFOURCC(codec);
            info.dwScale               = 1;
            info.dwRate                = rate;
            info.dwSuggestedBufferSize = stride * height;

            // create stream
            if (Win32.AVIFileCreateStream(file, out stream, ref info) != 0)
            {
                throw new ApplicationException("Failed creating stream");
            }

            // describe compression options
            Win32.AVICOMPRESSOPTIONS opts = new Win32.AVICOMPRESSOPTIONS();

            opts.fccHandler = Win32.mmioFOURCC(codec);
            opts.dwQuality  = quality;

            //
            // Win32.AVISaveOptions(stream, ref opts, IntPtr.Zero);

            // create compressed stream
            if (Win32.AVIMakeCompressedStream(out streamCompressed, stream, ref opts, IntPtr.Zero) != 0)
            {
                throw new ApplicationException("Failed creating compressed stream");
            }

            // describe frame format
            Win32.BITMAPINFOHEADER bih = new Win32.BITMAPINFOHEADER();

            bih.biSize        = Marshal.SizeOf(bih.GetType());
            bih.biWidth       = width;
            bih.biHeight      = height;
            bih.biPlanes      = 1;
            bih.biBitCount    = 24;
            bih.biSizeImage   = 0;
            bih.biCompression = 0;             // BI_RGB

            // set frame format
            if (Win32.AVIStreamSetFormat(streamCompressed, 0, ref bih, Marshal.SizeOf(bih.GetType())) != 0)
            {
                throw new ApplicationException("Failed creating compressed stream");
            }

            // alloc unmanaged memory for frame
            buf = Marshal.AllocHGlobal(stride * height);

            position = 0;
        }