/// <summary>Initialize a VideoStream for an existing stream</summary> /// <param name="aviFile">The file that contains the stream</param> /// <param name="aviStream">An IAVISTREAM from [aviFile]</param> public VideoStream(int aviFile, IntPtr aviStream) { this.aviFile = aviFile; this.aviStream = aviStream; Avi.AVISTREAMINFO streamInfo = GetStreamInfo(aviStream); //Avi.BITMAPINFOHEADER bih = new Avi.BITMAPINFOHEADER(); //int size = Marshal.SizeOf(bih); Avi.BITMAPINFO bih = new Avi.BITMAPINFO(); int size = Marshal.SizeOf(bih.bmiHeader); Avi.AVIStreamReadFormat(aviStream, 0, ref bih, ref size); if (bih.bmiHeader.biBitCount < 24) { size = Marshal.SizeOf(bih.bmiHeader) + Avi.PALETTE_SIZE; Avi.AVIStreamReadFormat(aviStream, 0, ref bih, ref size); CopyPalette(bih.bmiColors); } this.frameRate = (float)streamInfo.dwRate / (float)streamInfo.dwScale; this.width = (int)streamInfo.rcFrame.right; this.height = (int)streamInfo.rcFrame.bottom; this.frameSize = bih.bmiHeader.biSizeImage; this.countBitsPerPixel = bih.bmiHeader.biBitCount; this.firstFrame = Avi.AVIStreamStart(aviStream.ToInt32()); this.countFrames = Avi.AVIStreamLength(aviStream.ToInt32()); }
/* * /// <summary>Export a frame into a bitmap</summary> * /// <param name="position">Position of the frame</param> * public Bitmap GetBitmap(int position){ * if(position > countFrames){ * throw new Exception("Invalid frame position: "+position); * } * * Avi.AVISTREAMINFO streamInfo = GetStreamInfo(StreamPointer); * * //Decompress the frame and return a pointer to the DIB * int dib = Avi.AVIStreamGetFrame(getFrameObject, firstFrame + position); * //Copy the bitmap header into a managed struct * Avi.BITMAPINFOHEADER bih = new Avi.BITMAPINFOHEADER(); * bih = (Avi.BITMAPINFOHEADER)Marshal.PtrToStructure(new IntPtr(dib), bih.GetType()); * * if(bih.biSizeImage < 1){ * throw new Exception("Exception in VideoStreamGetFrame"); * } * * //copy the image * * byte[] bitmapData; * int address = dib + Marshal.SizeOf(bih); * if(bih.biBitCount < 16){ * //copy palette and pixels * bitmapData = new byte[bih.biSizeImage + Avi.PALETTE_SIZE]; * }else{ * //copy only pixels * bitmapData = new byte[bih.biSizeImage]; * } * * Marshal.Copy(new IntPtr(address), bitmapData, 0, bitmapData.Length); * * //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(); * Marshal.Copy(new IntPtr(address), bitmapInfo, 0, bitmapInfo.Length); * * Marshal.FreeHGlobal(ptr); * * //create file header * Avi.BITMAPFILEHEADER bfh = new Avi.BITMAPFILEHEADER(); * bfh.bfType = Avi.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); * if(bih.biBitCount < 16){ * //There is a palette between header and pixel data * bfh.bfOffBits += Avi.PALETTE_SIZE; * } * * //write a bitmap stream * BinaryWriter bw = new BinaryWriter( new MemoryStream() ); * * //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); * * Bitmap bmp = (Bitmap)Image.FromStream(bw.BaseStream); * Bitmap saveableBitmap = new Bitmap(bmp.Width, bmp.Height); * Graphics g = Graphics.FromImage(saveableBitmap); * g.DrawImage(bmp, 0,0); * g.Dispose(); * bmp.Dispose(); * * bw.Close(); * return saveableBitmap; * }*/ public Bitmap GetBitmap(int position) { if (position > countFrames) { throw new Exception("Invalid frame position: " + position); } Avi.AVISTREAMINFO streamInfo = GetStreamInfo(aviStream); // Get the pointer to the BITMAPINFOHEADER int firstFrame = Avi.AVIStreamStart(aviStream.ToInt32()); IntPtr bitmapPtr = new IntPtr(Avi.AVIStreamGetFrame(getFrameObject, firstFrame + position)); // Copy into a BITMAPINFOHEADER structure Avi.BITMAPINFOHEADER bitmapInfo = (Avi.BITMAPINFOHEADER)Marshal.PtrToStructure(bitmapPtr, typeof(Avi.BITMAPINFOHEADER)); // Find the offset of the raw image data IntPtr imagePtr = new IntPtr(bitmapPtr.ToInt32() + bitmapInfo.biSize); // Determine the stride int stride = bitmapInfo.biSizeImage / bitmapInfo.biHeight; // Determine the pixel format PixelFormat pixelFormat = ConvertBitCountToPixelFormat(bitmapInfo.biBitCount); // Create a bitmap from the raw image data Bitmap bmp = new Bitmap(bitmapInfo.biWidth, bitmapInfo.biHeight, stride, pixelFormat, imagePtr); // Flip the bitmap vertically bmp.RotateFlip(RotateFlipType.RotateNoneFlipY); return(bmp); }
/// <summary>Initialize a VideoStream for an existing stream</summary> /// <param name="aviFile">The file that contains the stream</param> /// <param name="aviStream">An IAVISTREAM from [aviFile]</param> public VideoStream(int aviFile, IntPtr aviStream) { base.aviFile = aviFile; base.aviStream = aviStream; Avi.BITMAPINFOHEADER bih = new Avi.BITMAPINFOHEADER(); int size = Marshal.SizeOf(bih); Avi.AVIStreamReadFormat(aviStream, 0, ref bih, ref size); Avi.AVISTREAMINFO streamInfo = GetStreamInfo(aviStream); frameRate = streamInfo.dwRate / streamInfo.dwScale; width = (int)streamInfo.rcFrame.right; height = (int)streamInfo.rcFrame.bottom; frameSize = bih.biSizeImage; countBitsPerPixel = bih.biBitCount; int firstFrame = Avi.AVIStreamStart(aviStream.ToInt32()); countFrames = firstFrame + Avi.AVIStreamLength(aviStream.ToInt32()); }
/// <summary>Export a frame into a bitmap</summary> /// <param name="position">Position of the frame</param> public Bitmap GetBitmap(int position) { if (position > countFrames) { throw new Exception("Invalid frame position: " + position); } Avi.AVISTREAMINFO streamInfo = GetStreamInfo(aviStream); //Decompress the frame and return a pointer to the DIB int firstFrame = Avi.AVIStreamStart(aviStream.ToInt32()); int dib = Avi.AVIStreamGetFrame(getFrameObject, firstFrame + position); IntPtr ptrDib = new IntPtr(dib); //Copy the bitmap header into a managed struct Avi.BITMAPINFOHEADER bih = new Avi.BITMAPINFOHEADER(); bih = (Avi.BITMAPINFOHEADER)Marshal.PtrToStructure(ptrDib, bih.GetType()); //Copy bitmap info header into managed bytes byte[] bitmapInfo = new byte[Marshal.SizeOf(bih)]; Marshal.Copy(ptrDib, bitmapInfo, 0, bitmapInfo.Length); if (bih.biSizeImage < 1) { throw new Exception("Exception in VideoStreamGetFrame"); } //copy the image byte[] bitmapData; int address = dib + Marshal.SizeOf(bih); if (bih.biBitCount < 16) { //copy palette and pixels bitmapData = new byte[bih.biSizeImage + Avi.PALETTE_SIZE]; } else { //copy only pixels bitmapData = new byte[bih.biSizeImage]; } for (int offset = 0; offset < bitmapData.Length; offset++) { bitmapData[offset] = Marshal.ReadByte(new IntPtr(address)); address++; } //create file header Avi.BITMAPFILEHEADER bfh = new Avi.BITMAPFILEHEADER(); bfh.bfType = Avi.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); if (bih.biBitCount < 16) { //There is a palette between header and pixel data bfh.bfOffBits += Avi.PALETTE_SIZE; } //write a bitmap stream BinaryWriter bw = new BinaryWriter(new MemoryStream()); //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); Bitmap bmp = (Bitmap)Image.FromStream(bw.BaseStream); Bitmap saveableBitmap = new Bitmap(bmp.Width, bmp.Height); Graphics g = Graphics.FromImage(saveableBitmap); g.DrawImage(bmp, 0, 0); g.Dispose(); bmp.Dispose(); bw.Close(); return(saveableBitmap); }