public VfwAviWriter(string filename, int rate, int scale)
{
Initialize();
int hr = VfwApi.AVIFileOpen(ref pfile_, filename, VfwApi.OF_CREATE | VfwApi.OF_SHARE_DENY_WRITE, IntPtr.Zero);
if (hr != 0)
{
throw new VfwException("AVIFileOpen", hr);
}
rate_ = rate;
scale_ = scale;
}
public void Open(string filename)
{
if (!File.Exists(filename))
{
throw new FileNotFoundException();
}
Initialize();
int hr = VfwApi.AVIFileOpen(ref pfile_, filename, VfwApi.OF_READ | VfwApi.OF_SHARE_DENY_NONE, IntPtr.Zero);
if (hr != 0)
{
throw new VfwException("AVIFileOpen", hr);
}
hr = VfwApi.AVIFileGetStream(pfile_, ref pavi_, 0, 0);
if (hr != 0)
{
throw new VfwException("AVIFileGetStream", hr);
}
frame_start_ = VfwApi.AVIStreamStart(pavi_);
frame_length_ = VfwApi.AVIStreamLength(pavi_);
VfwApi.AVISTREAMINFO psi = new VfwApi.AVISTREAMINFO();
hr = VfwApi.AVIStreamInfo(pavi_, ref psi, Marshal.SizeOf(new VfwApi.AVISTREAMINFO()));
if (hr != 0)
{
throw new VfwException("AVIStreamInfo", hr);
}
rate_ = psi.dwRate;
scale_ = psi.dwScale;
pgf_ = VfwApi.AVIStreamGetFrameOpen(pavi_, IntPtr.Zero);
if (pgf_ == IntPtr.Zero)
{
throw new VfwException("AVIStreamGetFrameOpen", 0);
}
GetBitmapHeader();
}