// Constructor
public AVIWriter()
{
Win32.AVIFileInit();
}
// 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;
}
