/// <summary>
/// Acquires a video codec configuration from the user
/// </summary>
public IDisposable AcquireVideoCodecToken(IntPtr hwnd, CodecToken lastCodecToken)
{
if (!IsOpen)
{
throw new InvalidOperationException("File must be opened before acquiring a codec token (or else the stream formats wouldnt be known)");
}
if (lastCodecToken != null)
{
currVideoCodecToken = lastCodecToken;
}
//encoder params
Win32.AVICOMPRESSOPTIONS comprOptions = new Win32.AVICOMPRESSOPTIONS();
if (currVideoCodecToken != null)
{
currVideoCodecToken.AllocateToAVICOMPRESSOPTIONS(ref comprOptions);
}
bool result = AVISaveOptions(pAviRawVideoStream, ref comprOptions, hwnd) != 0;
CodecToken ret = CodecToken.CreateFromAVICOMPRESSOPTIONS(ref comprOptions);
//so, AVISaveOptions may have changed some of the pointers
//if it changed the pointers, did it it free the old ones? we don't know
//let's assume it frees them. if we're wrong, we leak. if we assume otherwise and we're wrong, we may crash.
//so that means any pointers that come in here are either
//1. ones we allocated a minute ago
//2. ones VFW allocated
//guess what? doesn't matter. We'll free them all ourselves.
CodecToken.DeallocateAVICOMPRESSOPTIONS(ref comprOptions);
if (result)
{
// save to config and return it
Global.Config.AVICodecToken = ret.Serialize();
return(ret);
}
else
{
return(null);
}
}
/// <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");
}
}
