// 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;
}
