public static Bitmap Open(string fileName, int width, int height, PixelFormat format)
{
// Make sure any previous file is closed
Close();
bool success = false;
Bitmap theBitmap = new Bitmap(width, height, format);
// Get the actual stride
BitmapData bmpData = theBitmap.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadOnly, theBitmap.PixelFormat);
m_Stride = bmpData.Stride;
theBitmap.UnlockBits(bmpData);
try
{
// create new file
if (NM.AVIFileOpen(out m_File, fileName, NM.OpenFileMode.Create | NM.OpenFileMode.Write, IntPtr.Zero) != 0)
{
throw new Exception("Failed to create the file");
}
m_Width = width;
m_Height = height;
// describe new stream
NM.AVISTREAMINFO info = new NM.AVISTREAMINFO();
info.fccType = mmioFOURCC("vids");
info.fccHandler = mmioFOURCC(m_Codec);
info.dwScale = 1;
info.dwRate = FrameRate;
info.dwSuggestedBufferSize = m_Stride * height;
// create stream
if (NM.AVIFileCreateStream(m_File, out m_Stream, ref info) != 0)
{
throw new Exception("Failed to create the stream");
}
// describe compression options
NM.AVICOMPRESSOPTIONS options = new NM.AVICOMPRESSOPTIONS();
options.fccHandler = mmioFOURCC(m_Codec);
options.dwQuality = Quality * 100;
options.dwKeyFrameEvery = KeyFrameEvery;
if (options.dwKeyFrameEvery == 0)
{
options.dwFlags = NM.AviCompression.AVICOMPRESSF_VALID;
}
else
{
options.dwFlags = NM.AviCompression.AVICOMPRESSF_KEYFRAMES | NM.AviCompression.AVICOMPRESSF_VALID;
}
// Create the compressed stream
if (NM.AVIMakeCompressedStream(out m_StreamCompressed, m_Stream, ref options, IntPtr.Zero) != 0)
{
throw new Exception("Failed to create the compressed stream");
}
// Create the header for the frame format
NM.BITMAPINFOHEADER bitmapInfoHeader = new NM.BITMAPINFOHEADER();
bitmapInfoHeader.biSize = Marshal.SizeOf(typeof(NM.BITMAPINFOHEADER));
bitmapInfoHeader.biWidth = width;
bitmapInfoHeader.biHeight = height;
bitmapInfoHeader.biPlanes = 1;
bitmapInfoHeader.biBitCount = (short)Image.GetPixelFormatSize(format);
bitmapInfoHeader.biSizeImage = 0;
bitmapInfoHeader.biCompression = 0; // BI_RGB
// Write the header
if (NM.AVIStreamSetFormat(m_StreamCompressed, 0, ref bitmapInfoHeader, bitmapInfoHeader.biSize) != 0)
{
throw new Exception("Failed to set the compressed stream format");
}
// alloc unmanaged memory for the flipped frame buffer
m_FlippedFrameBuffer = Marshal.AllocHGlobal(m_Stride * height);
if (m_FlippedFrameBuffer == IntPtr.Zero)
{
throw new Exception("Failed to allocate memory for the flipped frame buffer");
}
m_CurrentFrame = 0;
success = true;
}
finally
{
if (!success)
{
Close();
}
}
return(theBitmap);
}
