AVIStreamGetFrame() приватный Метод

private AVIStreamGetFrame ( int pGetFrameObj, int lPos ) : int
pGetFrameObj int
lPos int
Результат int
Пример #1
0
        public void ExportToArray(int position, out byte[] bitmapData, out int width, out int height, out int bit_count)
        {
            if (position > countFrames)
            {
                throw new Exception("Invalid frame position");
            }
            //Decompress the frame and return a pointer to the DIB
            int pDib = VFW.AVIStreamGetFrame(getFrameObject, firstFrame + position);
            //Copy the bitmap header into a managed struct
            BITMAPINFOHEADER bih = new BITMAPINFOHEADER();

            bih = (BITMAPINFOHEADER)Marshal.PtrToStructure(new IntPtr(pDib), bih.GetType());

            if (bih.biSizeImage < 1)
            {
                throw new Exception("Exception in AVIStreamGetFrame: Not bitmap decompressed.");
            }

            //Copy the image
            bitmapData = new byte[bih.biSizeImage];
            int address = pDib + Marshal.SizeOf(bih);

            Marshal.Copy(new IntPtr(address), bitmapData, 0, bitmapData.Length);
            width     = bih.biWidth;
            height    = bih.biHeight;
            bit_count = bih.biBitCount;
        }
Пример #2
0
        public Bitmap Export(int position)
        {
            if (position > countFrames)
            {
                throw new Exception("Invalid frame position");
            }
            //Decompress the frame and return a pointer to the DIB
            int pDib = VFW.AVIStreamGetFrame(getFrameObject, firstFrame + position);

            if (pDib == 0)
            {
                //throw new Exception( "AVIStreamGetFrame; failed" );
                return(null);
            }
            //Copy the bitmap header into a managed struct
            BITMAPINFOHEADER bih = new BITMAPINFOHEADER();

            bih = (BITMAPINFOHEADER)Marshal.PtrToStructure(new IntPtr(pDib), bih.GetType());
            if (bih.biSizeImage < 1)
            {
                throw new Exception("Exception in AVIStreamGetFrame: Not bitmap decompressed.");
            }
            Bitmap     result = new Bitmap(bih.biWidth, bih.biHeight);
            BitmapData dat    = result.LockBits(
                new Rectangle(0, 0, bih.biWidth, bih.biHeight),
                ImageLockMode.ReadWrite,
                PixelFormat.Format24bppRgb);
            //Copy the image
            int address = pDib + Marshal.SizeOf(bih);
            int length  = dat.Stride * dat.Height;

            byte[] target = new byte[length];
            Marshal.Copy(new IntPtr(address), target, 0, length);
            Marshal.Copy(target, 0, dat.Scan0, length);
            result.UnlockBits(dat);
            result.RotateFlip(RotateFlipType.RotateNoneFlipY);
            return(result);
        }
Пример #3
0
        /// <summary>Exports a frame into a bitmap file</summary>
        /// <param name="position">Position of the frame</param>
        /// <param name="dstFileName">Name ofthe file to store the bitmap</param>
        public void ExportBitmap(int position, String dstFileName)
        {
            if (position > countFrames)
            {
                throw new Exception("Invalid frame position");
            }

            //Decompress the frame and return a pointer to the DIB
            int pDib = VFW.AVIStreamGetFrame(getFrameObject, firstFrame + position);
            //Copy the bitmap header into a managed struct
            BITMAPINFOHEADER bih = new BITMAPINFOHEADER();

            bih = (BITMAPINFOHEADER)Marshal.PtrToStructure(new IntPtr(pDib), bih.GetType());

            /*if(bih.biBitCount < 24){
             *  throw new Exception("Not enough colors! DIB color depth is less than 24 bit.");
             * }else */
            if (bih.biSizeImage < 1)
            {
                throw new Exception("Exception in AVIStreamGetFrame: Not bitmap decompressed.");
            }

            //Copy the image
            byte[] bitmapData = new byte[bih.biSizeImage];
            int    address    = pDib + Marshal.SizeOf(bih);

            for (int offset = 0; offset < bitmapData.Length; offset++)
            {
                bitmapData[offset] = Marshal.ReadByte(new IntPtr(address));
                address++;
            }

            //Copy bitmap info
            byte[] bitmapInfo = new byte[Marshal.SizeOf(bih)];
            IntPtr ptr;

            ptr = Marshal.AllocHGlobal(bitmapInfo.Length);
            Marshal.StructureToPtr(bih, ptr, false);
            address = ptr.ToInt32();
            for (int offset = 0; offset < bitmapInfo.Length; offset++)
            {
                bitmapInfo[offset] = Marshal.ReadByte(new IntPtr(address));
                address++;
            }

            //Create file header
            BITMAPFILEHEADER bfh = new BITMAPFILEHEADER();

            bfh.bfType      = Util.BMP_MAGIC_COOKIE;
            bfh.bfSize      = (Int32)(55 + bih.biSizeImage); //size of file as written to disk
            bfh.bfReserved1 = 0;
            bfh.bfReserved2 = 0;
            bfh.bfOffBits   = Marshal.SizeOf(bih) + Marshal.SizeOf(bfh);

            //Create or overwrite the destination file
            FileStream   fs = new FileStream(dstFileName, System.IO.FileMode.Create);
            BinaryWriter bw = new BinaryWriter(fs);

            //Write header
            bw.Write(bfh.bfType);
            bw.Write(bfh.bfSize);
            bw.Write(bfh.bfReserved1);
            bw.Write(bfh.bfReserved2);
            bw.Write(bfh.bfOffBits);
            //Write bitmap info
            bw.Write(bitmapInfo);
            //Write bitmap data
            bw.Write(bitmapData);
            bw.Close();
            fs.Close();
        }