public void OpenFile(string destPath, Parameters parameters, CodecToken videoCodecToken)
{
this.parameters = parameters;
this.currVideoCodecToken = videoCodecToken;
//TODO - try creating the file once first before we let vfw botch it up?
//open the avi output file handle
if (File.Exists(destPath))
{
File.Delete(destPath);
}
if (Win32.FAILED(Win32.AVIFileOpenW(ref pAviFile, destPath, Win32.OpenFileStyle.OF_CREATE | Win32.OpenFileStyle.OF_WRITE, 0)))
{
throw new InvalidOperationException("Couldnt open dest path for avi file: " + destPath);
}
//initialize the video stream
Win32.AVISTREAMINFOW vidstream_header = new Win32.AVISTREAMINFOW();
Win32.BITMAPINFOHEADER bmih = new Win32.BITMAPINFOHEADER();
parameters.PopulateBITMAPINFOHEADER24(ref bmih);
vidstream_header.fccType = Win32.mmioFOURCC("vids");
vidstream_header.dwRate = parameters.fps;
vidstream_header.dwScale = parameters.fps_scale;
vidstream_header.dwSuggestedBufferSize = (int)bmih.biSizeImage;
if (Win32.FAILED(Win32.AVIFileCreateStreamW(pAviFile, out pAviRawVideoStream, ref vidstream_header)))
{
CloseFile();
throw new InvalidOperationException("Failed opening raw video stream. Not sure how this could happen");
}
//initialize audio stream
Win32.AVISTREAMINFOW audstream_header = new Win32.AVISTREAMINFOW();
Win32.WAVEFORMATEX wfex = new Win32.WAVEFORMATEX();
parameters.PopulateWAVEFORMATEX(ref wfex);
audstream_header.fccType = Win32.mmioFOURCC("auds");
audstream_header.dwQuality = -1;
audstream_header.dwScale = wfex.nBlockAlign;
audstream_header.dwRate = (int)wfex.nAvgBytesPerSec;
audstream_header.dwSampleSize = wfex.nBlockAlign;
audstream_header.dwInitialFrames = 1; // ??? optimal value?
if (Win32.FAILED(Win32.AVIFileCreateStreamW(pAviFile, out pAviRawAudioStream, ref audstream_header)))
{
CloseFile();
throw new InvalidOperationException("Failed opening raw audio stream. Not sure how this could happen");
}
outStatus = new OutputStatus();
IsOpen = true;
}
/// <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");
}
}