/// <summary> /// Open AVI file. /// </summary> /// /// <param name="fileName">AVI file name to open.</param> /// /// <remarks><para>The method opens a video file and prepares the stream and decoder for /// reading video frames with the help of <see cref="GetNextFrame"/> method.</para> /// </remarks> /// /// <exception cref="ApplicationException">Failure of opening video files (the exception message /// specifies the issues).</exception> /// public void Open(string fileName) { // close previous file Close(); lock (this) { // open AVI file if (Win32.AVIFileOpen(out file, fileName, Win32.OpenFileMode.ShareDenyWrite, IntPtr.Zero) != 0) { throw new ApplicationException("Failed opening AVI 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.rectFrame.right; height = info.rectFrame.bottom; position = info.start; start = info.start; length = info.length; rate = (float)info.rate / (float)info.scale; codec = Win32.decode_mmioFOURCC(info.handler); // prepare decompressor Win32.BITMAPINFOHEADER bitmapInfoHeader = new Win32.BITMAPINFOHEADER(); bitmapInfoHeader.size = Marshal.SizeOf(bitmapInfoHeader.GetType()); bitmapInfoHeader.width = width; bitmapInfoHeader.height = height; bitmapInfoHeader.planes = 1; bitmapInfoHeader.bitCount = 24; bitmapInfoHeader.compression = 0; // BI_RGB // get frame object if ((getFrame = Win32.AVIStreamGetFrameOpen(stream, ref bitmapInfoHeader)) == IntPtr.Zero) { bitmapInfoHeader.height = -height; if ((getFrame = Win32.AVIStreamGetFrameOpen(stream, ref bitmapInfoHeader)) == IntPtr.Zero) { throw new ApplicationException("Failed initializing decompressor"); } } } }
/// <summary> /// Create new AVI file and open it for writing. /// </summary> /// /// <param name="fileName">AVI file name to create.</param> /// <param name="width">Video width.</param> /// <param name="height">Video height.</param> /// /// <remarks><para>The method opens (creates) a video files, configure video codec and prepares /// the stream for saving video frames with a help of <see cref="AddFrame"/> method.</para></remarks> /// /// <exception cref="ApplicationException">Failure of opening video files (the exception message /// specifies the issues).</exception> /// public void Open(string fileName, int width, int height) { // close previous file Close(); lock (this) { // calculate stride stride = width * 3; if ((stride % 4) != 0) { stride += (4 - stride % 4); } // create new file if (Win32.AVIFileOpen(out file, fileName, 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.type = Win32.mmioFOURCC("vids"); info.handler = Win32.mmioFOURCC(codec); info.scale = 1; info.rate = rate; info.suggestedBufferSize = stride * height; // create stream if (Win32.AVIFileCreateStream(file, out stream, ref info) != 0) { throw new ApplicationException("Failed creating stream"); } // describe compression options Win32.AVICOMPRESSOPTIONS options = new Win32.AVICOMPRESSOPTIONS(); options.handler = Win32.mmioFOURCC(codec); options.quality = quality; // uncomment if video settings dialog is required to show // Win32.AVISaveOptions( stream, ref options ); // create compressed stream if (Win32.AVIMakeCompressedStream(out streamCompressed, stream, ref options, IntPtr.Zero) != 0) { throw new ApplicationException("Failed creating compressed stream"); } // describe frame format Win32.BITMAPINFOHEADER bitmapInfoHeader = new Win32.BITMAPINFOHEADER(); bitmapInfoHeader.size = Marshal.SizeOf(bitmapInfoHeader.GetType()); bitmapInfoHeader.width = width; bitmapInfoHeader.height = height; bitmapInfoHeader.planes = 1; bitmapInfoHeader.bitCount = 24; bitmapInfoHeader.sizeImage = 0; bitmapInfoHeader.compression = 0; // BI_RGB // set frame format if (Win32.AVIStreamSetFormat(streamCompressed, 0, ref bitmapInfoHeader, Marshal.SizeOf(bitmapInfoHeader.GetType())) != 0) { throw new ApplicationException("Failed creating compressed stream"); } // alloc unmanaged memory for frame buffer = Marshal.AllocHGlobal(stride * height); if (buffer == IntPtr.Zero) { throw new ApplicationException("Insufficient memory for internal buffer"); } position = 0; } }