C# Class ScreenToGif.Webcam.DirectX.CaptureWebcam

Gets the video output of a webcam or other video device.

Inheritance: EditStreaming.ISampleGrabberCB, IDisposable

显示文件 Open project: dbremner/ScreenToGif Class Usage Examples

Protected Properties

Property	Type	Description
ActualGraphState	GraphState
CaptureGraphBuilder	ExtendStreaming.ICaptureGraphBuilder2
GraphBuilder	ExtendStreaming.IGraphBuilder
IsPreviewRendered	bool
MediaControl	ControlStreaming.IMediaControl
SampGrabber	EditStreaming.ISampleGrabber
VideoCompressor	Filter
VideoCompressorFilter	CoreStreaming.IBaseFilter
VideoDeviceFilter	CoreStreaming.IBaseFilter
VideoStreamConfig	ExtendStreaming.IAMStreamConfig
VideoWindow	ControlStreaming.IVideoWindow
WantPreviewRendered	bool

Public Methods

Method	Description
BufferCB ( double SampleTime, IntPtr pBuffer, int BufferLen ) : int
CaptureWebcam ( Filter videoDevice ) : System	Default constructor of the Capture class.
Dispose ( ) : void	Closes and cleans the video previewing.
GetFrame ( ) : Bitmap	Gets the current frame from the buffer.
PrepareCapture ( ) : void	Prepares the capture of frames.
SampleCB ( double SampleTime, CoreStreaming pSample ) : int
StartPreview ( ) : void	Starts the video preview from the video source.
StopPreview ( ) : void	Stops the video previewing.

Protected Methods

Method	Description
CreateGraph ( ) : void	Create a new filter graph and add filters (devices, compressors, misc), but leave the filters unconnected. Call RenderGraph() to connect the filters.
DerenderGraph ( ) : void	Disconnect and remove all filters except the device and compressor filters. This is the opposite of renderGraph(). Soem properties such as FrameRate can only be set when the device output pins are not connected.
DestroyGraph ( ) : void	Completely tear down a filter graph and release all associated resources.
OnPreviewWindowResize ( object sender, EventArgs e ) : void	Resize the preview when the PreviewWindow is resized
RemoveDownstream ( CoreStreaming filter, bool removeFirstFilter ) : void	Removes all filters downstream from a filter from the graph. This is called only by DerenderGraph() to remove everything from the graph except the devices and compressors. The parameter "removeFirstFilter" is used to keep a compressor (that should be immediately downstream of the device) if one is begin used.
RenderGraph ( ) : void	Connects the filters of a previously created graph (created by CreateGraph()). Once rendered the graph is ready to be used. This method may also destroy streams if we have streams we no longer want.
StartPreviewIfNeeded ( ) : void	Setup and start the preview window if the user has requested it (by setting PreviewWindow).

Method Details

BufferCB() public method

public BufferCB ( double SampleTime, IntPtr pBuffer, int BufferLen ) : int
SampleTime	double
pBuffer	System.IntPtr
BufferLen	int
return	int

CaptureWebcam() public method

Default constructor of the Capture class.

If no video device is provided.

public CaptureWebcam ( Filter videoDevice ) : System
videoDevice	Filter	The video device to be the source.
return	System

CreateGraph() protected method

Create a new filter graph and add filters (devices, compressors, misc), but leave the filters unconnected. Call RenderGraph() to connect the filters.

protected CreateGraph ( ) : void
return	void

DerenderGraph() protected method

Disconnect and remove all filters except the device and compressor filters. This is the opposite of renderGraph(). Soem properties such as FrameRate can only be set when the device output pins are not connected.

protected DerenderGraph ( ) : void
return	void

DestroyGraph() protected method

Completely tear down a filter graph and release all associated resources.

protected DestroyGraph ( ) : void
return	void

Dispose() public method

Closes and cleans the video previewing.

public Dispose ( ) : void
return	void

GetFrame() public method

Gets the current frame from the buffer.

public GetFrame ( ) : Bitmap
return	System.Drawing.Bitmap

OnPreviewWindowResize() protected method

Resize the preview when the PreviewWindow is resized

protected OnPreviewWindowResize ( object sender, EventArgs e ) : void
sender	object
e	System.EventArgs
return	void

PrepareCapture() public method

Prepares the capture of frames.

public PrepareCapture ( ) : void
return	void

RemoveDownstream() protected method

Removes all filters downstream from a filter from the graph. This is called only by DerenderGraph() to remove everything from the graph except the devices and compressors. The parameter "removeFirstFilter" is used to keep a compressor (that should be immediately downstream of the device) if one is begin used.

protected RemoveDownstream ( CoreStreaming filter, bool removeFirstFilter ) : void
filter	CoreStreaming
removeFirstFilter	bool
return	void

RenderGraph() protected method

Connects the filters of a previously created graph (created by CreateGraph()). Once rendered the graph is ready to be used. This method may also destroy streams if we have streams we no longer want.

protected RenderGraph ( ) : void
return	void

SampleCB() public method

public SampleCB ( double SampleTime, CoreStreaming pSample ) : int
SampleTime	double
pSample	CoreStreaming
return	int

StartPreview() public method

Starts the video preview from the video source.

public StartPreview ( ) : void
return	void

StartPreviewIfNeeded() protected method

Setup and start the preview window if the user has requested it (by setting PreviewWindow).

protected StartPreviewIfNeeded ( ) : void
return	void

StopPreview() public method

Stops the video previewing.

public StopPreview ( ) : void
return	void

Property Details

ActualGraphState protected_oe property

State of the internal filter graph.

protected GraphState ActualGraphState
return	GraphState

CaptureGraphBuilder protected_oe property

DShow Filter: building graphs for capturing video.

protected ExtendStreaming.ICaptureGraphBuilder2 CaptureGraphBuilder
return	ExtendStreaming.ICaptureGraphBuilder2

GraphBuilder protected_oe property

DShow Filter: Graph builder.

protected ExtendStreaming.IGraphBuilder GraphBuilder
return	ExtendStreaming.IGraphBuilder

IsPreviewRendered protected_oe property

When graphState==Rendered, have we rendered the preview stream?

protected bool IsPreviewRendered
return	bool

MediaControl protected_oe property

DShow Filter: Start/Stop the filter graph -> copy of graphBuilder.

protected ControlStreaming.IMediaControl MediaControl
return	ControlStreaming.IMediaControl

SampGrabber protected_oe property

protected EditStreaming.ISampleGrabber SampGrabber
return	EditStreaming.ISampleGrabber

VideoCompressor protected_oe property

Property Backer: Video compression filter.

protected Filter,ScreenToGif.Webcam.DirectX VideoCompressor
return	Filter

VideoCompressorFilter protected_oe property

DShow Filter: selected video compressor.

protected CoreStreaming.IBaseFilter VideoCompressorFilter
return	CoreStreaming.IBaseFilter

VideoDeviceFilter protected_oe property

DShow Filter: selected video device.

protected CoreStreaming.IBaseFilter VideoDeviceFilter
return	CoreStreaming.IBaseFilter

VideoStreamConfig protected_oe property

DShow Filter: configure frame rate, size.

protected ExtendStreaming.IAMStreamConfig VideoStreamConfig
return	ExtendStreaming.IAMStreamConfig

VideoWindow protected_oe property

DShow Filter: Control preview window -> copy of graphBuilder.

protected ControlStreaming.IVideoWindow VideoWindow
return	ControlStreaming.IVideoWindow

WantPreviewRendered protected_oe property

Do we need the preview stream rendered (VideoDevice and PreviewWindow != null)

protected bool WantPreviewRendered
return	bool