/// <summary>
/// begin recording
/// </summary>
public void OpenStreams()
{
if (currVideoCodecToken == null)
{
throw new InvalidOperationException("set a video codec token before opening the streams!");
}
// open compressed video stream
Win32.AVICOMPRESSOPTIONS opts = new Win32.AVICOMPRESSOPTIONS();
currVideoCodecToken.AllocateToAVICOMPRESSOPTIONS(ref opts);
bool failed = Win32.FAILED(Win32.AVIMakeCompressedStream(out pAviCompressedVideoStream, pAviRawVideoStream, ref opts, IntPtr.Zero));
CodecToken.DeallocateAVICOMPRESSOPTIONS(ref opts);
if (failed)
{
CloseStreams();
throw new InvalidOperationException("Failed making compressed video stream");
}
// set the compressed video stream input format
Win32.BITMAPINFOHEADER bmih = new Win32.BITMAPINFOHEADER();
if (bit32)
{
parameters.PopulateBITMAPINFOHEADER32(ref bmih);
}
else
{
parameters.PopulateBITMAPINFOHEADER24(ref bmih);
}
if (Win32.FAILED(Win32.AVIStreamSetFormat(pAviCompressedVideoStream, 0, ref bmih, Marshal.SizeOf(bmih))))
{
bit32 = true; // we'll try again
CloseStreams();
throw new InvalidOperationException("Failed setting compressed video stream input format");
}
// set audio stream input format
Win32.WAVEFORMATEX wfex = new Win32.WAVEFORMATEX();
parameters.PopulateWAVEFORMATEX(ref wfex);
if (Win32.FAILED(Win32.AVIStreamSetFormat(pAviRawAudioStream, 0, ref wfex, Marshal.SizeOf(wfex))))
{
CloseStreams();
throw new InvalidOperationException("Failed setting raw audio stream input format");
}
}