/// <summary>
/// Gets the current frame size
/// </summary>
/// <returns>The frame size in a bitmap info header</returns>
private BitmapInfoHeader GetFrameSize()
{
BitmapInfoHeader bmiHeader = null;
try
{
IntPtr pmt = IntPtr.Zero;
AMMediaType mediaType = new AMMediaType();
try
{
// Get the current format info
mediaType.formatType = FormatType.VideoInfo2;
int hr = _streamConfig.GetFormat(out mediaType);
if (hr != 0)
{
Log.Log.Info("GetFrameSize: FAILED to get format - {0}", hr);
Marshal.ThrowExceptionForHR(hr);
return(bmiHeader);
}
// The formatPtr member points to different structures
// dependingon the formatType
if (mediaType.formatType == FormatType.VideoInfo)
{
VideoInfoHeader temp = new VideoInfoHeader();
Marshal.PtrToStructure(mediaType.formatPtr, temp);
bmiHeader = temp.BmiHeader;
}
else if (mediaType.formatType == FormatType.VideoInfo2)
{
VideoInfoHeader2 temp = new VideoInfoHeader2();
Marshal.PtrToStructure(mediaType.formatPtr, temp);
bmiHeader = temp.BmiHeader;
}
else if (mediaType.formatType == FormatType.Mpeg2Video)
{
MPEG2VideoInfo temp = new MPEG2VideoInfo();
Marshal.PtrToStructure(mediaType.formatPtr, temp);
bmiHeader = temp.hdr.BmiHeader;
}
else if (mediaType.formatType == FormatType.MpegVideo)
{
MPEG1VideoInfo temp = new MPEG1VideoInfo();
Marshal.PtrToStructure(mediaType.formatPtr, temp);
bmiHeader = temp.hdr.BmiHeader;
}
}
finally
{
Marshal.FreeCoTaskMem(pmt);
}
}
catch (Exception)
{
Log.Log.Info(" VideoCaptureDevice.getStreamConfigSetting() FAILED ");
}
return(bmiHeader);
}
public static extern void MFInitMediaTypeFromMPEG1VideoInfo(
[In] IMFMediaType pMFType,
MPEG1VideoInfo pMP1VI,
[In] int cbBufSize,
[In, MarshalAs(UnmanagedType.LPStruct)] Guid pSubtype
);
/// <summary>
/// Sets the frame size
/// </summary>
/// <param name="bmiHeader">The bitmap info header with the frame size</param>
/// <returns>true, if it was successful; false otherwise</returns>
private bool SetFrameSize(BitmapInfoHeader bmiHeader)
{
try
{
IntPtr pmt = IntPtr.Zero;
AMMediaType mediaType;
try
{
// Get the current format info
int hr = _streamConfig.GetFormat(out mediaType);
if (hr != 0)
{
Log.Log.Info("SetFrameSize: Failed to get the video format - {0}", hr);
return(false);
}
// The formatPtr member points to different structures
// dependingon the formatType
object formatStruct;
if (mediaType.formatType == FormatType.VideoInfo)
{
VideoInfoHeader temp = new VideoInfoHeader();
Marshal.PtrToStructure(mediaType.formatPtr, temp);
temp.BmiHeader = bmiHeader;
formatStruct = temp;
}
else if (mediaType.formatType == FormatType.VideoInfo2)
{
VideoInfoHeader2 temp = new VideoInfoHeader2();
Marshal.PtrToStructure(mediaType.formatPtr, temp);
temp.BmiHeader = bmiHeader;
formatStruct = temp;
}
else if (mediaType.formatType == FormatType.Mpeg2Video)
{
MPEG2VideoInfo temp = new MPEG2VideoInfo();
Marshal.PtrToStructure(mediaType.formatPtr, temp);
temp.hdr.BmiHeader = bmiHeader;
formatStruct = temp;
}
else if (mediaType.formatType == FormatType.MpegVideo)
{
MPEG1VideoInfo temp = new MPEG1VideoInfo();
Marshal.PtrToStructure(mediaType.formatPtr, temp);
temp.hdr.BmiHeader = bmiHeader;
formatStruct = temp;
}
else if (mediaType.formatType == FormatType.None)
{
Log.Log.Info("SetFrameSize: FAILED no format returned");
return(false);
}
else
{
Log.Log.Info("SetFrameSize: FAILED unknown fmt");
return(false);
}
// PtrToStructure copies the data so we need to copy it back
Marshal.StructureToPtr(formatStruct, mediaType.formatPtr, false);
// Save the changes
hr = _streamConfig.SetFormat(mediaType);
if (hr != 0)
{
Log.Log.Info("SetFrameSize: FAILED to set:{0}", hr);
return(false);
}
}
finally
{
Marshal.FreeCoTaskMem(pmt);
}
return(true);
}
catch (Exception)
{
Log.Log.Info("SetFrameSize: FAILED ");
}
return(false);
}
