/// <summary>
/// Closes video writer.
/// <para>Use dispose method to remove any additional resources.</para>
/// </summary>
public override void Close()
{
if (videoObjPtr != IntPtr.Zero)
{
CvHighGuiInvoke.cvReleaseVideoWriter(ref videoObjPtr);
}
}
/// <summary>
/// Releases all resources allocated by capture.
/// </summary>
public override void Close()
{
if (capturePtr != IntPtr.Zero)
{
CvHighGuiInvoke.cvReleaseCapture(ref capturePtr);
}
}
/// <summary>
/// Writes the provided image to the stream.
/// </summary>
/// <param name="image">Image to write.</param>
/// <returns>True, if the operation was successful, false otherwise.</returns>
protected unsafe override bool WriteInternal(IImage image)
{
bool isSuccessful;
lock (syncObj)
{
if (image.ColorInfo.NumberOfChannels == 3 && !ColorFrames)
{
throw new Exception("Image must be color!");
}
if (image.ColorInfo.NumberOfChannels == 1 && ColorFrames)
{
throw new Exception("Image must be grayscale!");
}
if (!image.Size.Equals(FrameSize))
{
throw new Exception("Input image must be the same size as defined frame size!");
}
this.Position++;
var iplImg = image.AsOpenCvImage();
IplImage *iplImgPtr = (IplImage *)&iplImg;
isSuccessful = CvHighGuiInvoke.cvWriteFrame(videoObjPtr, (IntPtr)iplImgPtr);
}
return(isSuccessful);
}
public static Size GetImageSize(IntPtr capturePtr)
{
return(new Size
{
Width = (int)CvHighGuiInvoke.cvGetCaptureProperty(capturePtr, CaptureProperty.FrameWidth),
Height = (int)CvHighGuiInvoke.cvGetCaptureProperty(capturePtr, CaptureProperty.FrameHeight)
});
}
/// <summary>
/// Sets the position within the current stream.
/// <para>Warning: the underlying OpenCV function seeks to nearest key-frame, therefore the seek operation may not be frame-accurate.</para>
/// </summary>
/// <param name="offset">A frame index offset relative to the origin parameter.</param>
/// <param name="origin">A value of type System.IO.SeekOrigin indicating the reference point used to obtain the new position.</param>
/// <returns>The new position within the current stream.</returns>
public override long Seek(long offset, System.IO.SeekOrigin origin = SeekOrigin.Current)
{
var frameIndex = base.Seek(offset, origin);
CvHighGuiInvoke.cvSetCaptureProperty(capturePtr, CaptureProperty.PosFrames, frameIndex);
return(Position);
}
public static bool SetImageSize(IntPtr capturePtr, Size newSize)
{
bool success;
success = CvHighGuiInvoke.cvSetCaptureProperty(capturePtr, CaptureProperty.FrameWidth, newSize.Width);
success &= CvHighGuiInvoke.cvSetCaptureProperty(capturePtr, CaptureProperty.FrameHeight, newSize.Height);
return(success);
}
/// <summary>
/// Opens the camera stream.
/// </summary>
public override void Open()
{
if (capturePtr != IntPtr.Zero)
{
return;
}
capturePtr = CvHighGuiInvoke.cvCreateCameraCapture(cameraIdx);
if (capturePtr == IntPtr.Zero)
{
throw new Exception("Cannot open camera stream! It seems that camera device can not be found.");
}
}
/// <summary>
/// Opens the video file stream.
/// </summary>
public override void Open()
{
if (videoObjPtr != IntPtr.Zero)
{
return;
}
videoObjPtr = CvHighGuiInvoke.cvCreateVideoWriter(OutputFileName, (int)Codec, FrameRate, FrameSize, ColorFrames);
if (videoObjPtr == IntPtr.Zero)
{
throw new Exception(String.Format("Cannot open FileStream! Please check that the selected codec ({0}) is supported.", Codec));
}
}
/// <summary>
/// Opens the video file stream.
/// </summary>
public override void Open()
{
if (capturePtr != IntPtr.Zero)
{
return;
}
capturePtr = CvHighGuiInvoke.cvCreateFileCapture(fileName);
if (capturePtr == IntPtr.Zero)
{
throw new Exception("Cannot open FileStream!");
}
}
private static IImage cvLoader(string fileName)
{
var cvImg = CvHighGuiInvoke.cvLoadImage(fileName, ImageLoadType.Unchanged);
var image = IplImage.FromPointer(cvImg).AsImage((_) =>
{
if (cvImg == IntPtr.Zero)
{
return;
}
CvHighGuiInvoke.cvReleaseImage(ref cvImg);
});
return(image);
}
/// <summary>
/// Reads the next image in the stream and advances the position by one.
/// </summary>
/// <param name="image">Read image.</param>
/// <returns>True if the reading operation was successful, false otherwise.</returns>
protected override bool ReadInternal(out IImage image)
{
bool status = false;
image = default(IImage);
lock (syncObj)
{
IntPtr cvFramePtr;
cvFramePtr = CvHighGuiInvoke.cvQueryFrame(capturePtr);
if (cvFramePtr != IntPtr.Zero)
{
image = IplImage.FromPointer(cvFramePtr).AsImage();
this.Position++;
status = true;
}
}
return(status);
}
