vpDirectShowGrabber Class Reference

#include <vpDirectShowGrabber.h>

Inheritance diagram for vpDirectShowGrabber:

Public Member Functions
unsigned int	getHeight ()
unsigned int	getWidth ()
	vpDirectShowGrabber ()
virtual	~vpDirectShowGrabber ()
void	open ()
void	open (vpImage< unsigned char > &I)
void	open (vpImage< vpRGBa > &I)
void	acquire (vpImage< unsigned char > &I)
void	acquire (vpImage< vpRGBa > &I)
void	close ()
unsigned int	getDeviceNumber ()
bool	setDevice (unsigned int id)
void	displayDevices ()
bool	setImageSize (unsigned int width, unsigned int height)
bool	setFramerate (double framerate)
bool	setFormat (unsigned int width, unsigned int height, double framerate)
void	getFormat (unsigned int &width, unsigned int &height, double &framerate)
bool	getStreamCapabilities ()
bool	setMediaType (int mediaTypeID)
int	getMediaType ()
unsigned int	getHeight () const
unsigned int	getWidth () const

Public Attributes
bool	init

Protected Attributes
unsigned int	height
unsigned int	width

Detailed Description

class for windows direct show devices

This class' goal is to totally hide the implementation of the framegrabber from the rest of the application. This is necessary to avoid conflicts between dshow's Qedit.h and Direct3D's includes.

Examples:

grabDirectShow.cpp, grabDirectShowMulti.cpp, manGrabDirectShow.cpp, and servoBiclopsPoint2DArtVelocity.cpp.

Definition at line 67 of file vpDirectShowGrabber.h.

Constructor & Destructor Documentation

vpDirectShowGrabber::vpDirectShowGrabber

(

)

Constructor. Initializes COM.

Definition at line 65 of file vpDirectShowGrabber.cpp.

vpDirectShowGrabber::~vpDirectShowGrabber ( )

virtual

Destructor

Definition at line 73 of file vpDirectShowGrabber.cpp.

Member Function Documentation

void vpDirectShowGrabber::acquire ( vpImage< unsigned char > &  I )

virtual

Grabs a grayscale image from the video stream. Uses a semaphore to synchronize with the framegrabber callback.

Parameters

I	The image to fill with the grabbed frame

Exceptions

otherError

Can't grab the frame

Implements vpFrameGrabber.

Examples:

grabDirectShow.cpp, grabDirectShowMulti.cpp, manGrabDirectShow.cpp, and servoBiclopsPoint2DArtVelocity.cpp.

Definition at line 113 of file vpDirectShowGrabber.cpp.

void vpDirectShowGrabber::acquire ( vpImage< vpRGBa > &  I )

virtual

Grabs a rgba image from the video stream. Uses a semaphore to synchronize with the framegrabber callback.

Parameters

I	The image to fill with the grabbed frame

Exceptions

otherError

Can't grab the frame

Implements vpFrameGrabber.

Definition at line 126 of file vpDirectShowGrabber.cpp.

void vpDirectShowGrabber::close ( )

virtual

Stops the framegrabber

Implements vpFrameGrabber.

Examples:

grabDirectShow.cpp, grabDirectShowMulti.cpp, and manGrabDirectShow.cpp.

Definition at line 135 of file vpDirectShowGrabber.cpp.

void vpDirectShowGrabber::displayDevices

(

)

Displays the list of devices on the standard output

Examples:

grabDirectShowMulti.cpp.

Definition at line 160 of file vpDirectShowGrabber.cpp.

unsigned int vpDirectShowGrabber::getDeviceNumber

(

)

Gets the number of capture devices

Returns

the number of capture devices

Examples:

grabDirectShow.cpp, grabDirectShowMulti.cpp, and manGrabDirectShow.cpp.

Definition at line 141 of file vpDirectShowGrabber.cpp.

void vpDirectShowGrabber::getFormat	(	unsigned int &	width,
		unsigned int &	height,
		double &	framerate
	)

Examples:

grabDirectShowMulti.cpp.

Definition at line 203 of file vpDirectShowGrabber.cpp.

unsigned int vpDirectShowGrabber::getHeight

(

)

Returns the number of rows in the grabbed image

Definition at line 53 of file vpDirectShowGrabber.cpp.

unsigned int vpFrameGrabber::getHeight ( ) const

inlineinherited

Return the number of rows in the image.

Examples:

AROgre.cpp, and AROgreBasic.cpp.

Definition at line 119 of file vpFrameGrabber.h.

int vpDirectShowGrabber::getMediaType

(

)

Examples:

grabDirectShowMulti.cpp.

Definition at line 234 of file vpDirectShowGrabber.cpp.

bool vpDirectShowGrabber::getStreamCapabilities

(

)

Get the available capture formats

Returns

true if successful

Examples:

grabDirectShowMulti.cpp.

Definition at line 213 of file vpDirectShowGrabber.cpp.

unsigned int vpDirectShowGrabber::getWidth

(

)

Returns the number of colunms in the grabbed image

Definition at line 58 of file vpDirectShowGrabber.cpp.

unsigned int vpFrameGrabber::getWidth ( ) const

inlineinherited

Return the number of columns in the image.

Examples:

AROgre.cpp, and AROgreBasic.cpp.

Definition at line 121 of file vpFrameGrabber.h.

void vpDirectShowGrabber::open

(

)

Creates the filter graph and select the first available device.

Exceptions

initializationError

Examples:

grabDirectShow.cpp, grabDirectShowMulti.cpp, manGrabDirectShow.cpp, and servoBiclopsPoint2DArtVelocity.cpp.

Definition at line 81 of file vpDirectShowGrabber.cpp.

void vpDirectShowGrabber::open ( vpImage< unsigned char > &  I )

virtual

Creates the filter graph and select the first available device.

Exceptions

initializationError

Implements vpFrameGrabber.

Definition at line 90 of file vpDirectShowGrabber.cpp.

void vpDirectShowGrabber::open ( vpImage< vpRGBa > &  I )

virtual

Creates the filter graph and select the first available device.

Exceptions

initializationError

Implements vpFrameGrabber.

Definition at line 99 of file vpDirectShowGrabber.cpp.

bool vpDirectShowGrabber::setDevice

(

unsigned int

id

)

Set the device (or camera) from which images will be grabbed.

Parameters

id	: Identifier of the device to use.

Returns

true if the device is set successfully, false otherwise.

Examples:

grabDirectShowMulti.cpp.

Definition at line 152 of file vpDirectShowGrabber.cpp.

bool vpDirectShowGrabber::setFormat	(	unsigned int	width,
		unsigned int	height,
		double	framerate
	)

Set capture format

Parameters

width	: Image width in pixel
height	: Image height in pixel
framerate	: Framerate in fps

Returns

true if successful

Definition at line 193 of file vpDirectShowGrabber.cpp.

bool vpDirectShowGrabber::setFramerate

(

double

framerate

)

Set capture framerate

Parameters

framerate

: Framerate in fps

Returns

true if successful

Examples:

manGrabDirectShow.cpp.

Definition at line 181 of file vpDirectShowGrabber.cpp.

bool vpDirectShowGrabber::setImageSize	(	unsigned int	width,
		unsigned int	height
	)

Set image Size

Parameters

width	: Image width
height	: Image height

Returns

true if successful

Examples:

manGrabDirectShow.cpp.

Definition at line 171 of file vpDirectShowGrabber.cpp.

bool vpDirectShowGrabber::setMediaType

(

int

mediaTypeID

)

Set capture MediaType

Parameters

mediaTypeID

: mediaTypeID (available in calling getStreamCapabilities)

Returns

true if successful

Examples:

grabDirectShowMulti.cpp.

Definition at line 224 of file vpDirectShowGrabber.cpp.

Member Data Documentation

unsigned int vpFrameGrabber::height

protectedinherited

Number of rows in the image.

Definition at line 113 of file vpFrameGrabber.h.

Referenced by vpDiskGrabber::acquire(), vpV4l2Grabber::acquire(), vp1394TwoGrabber::acquire(), vp1394TwoGrabber::dequeue(), vp1394TwoGrabber::getHeight(), vpDiskGrabber::open(), vpV4l2Grabber::open(), vpVideoReader::open(), vp1394CMUGrabber::open(), vp1394TwoGrabber::setFormat7ROI(), vp1394CMUGrabber::setVideoMode(), vp1394TwoGrabber::setVideoMode(), vp1394CMUGrabber::vp1394CMUGrabber(), and vp1394TwoGrabber::vp1394TwoGrabber().

bool vpFrameGrabber::init

inherited

Set to true if the frame grabber has been initialized.

Definition at line 111 of file vpFrameGrabber.h.

Referenced by vpV4l2Grabber::acquire(), vp1394CMUGrabber::close(), vp1394TwoGrabber::close(), vpDiskGrabber::open(), vpV4l2Grabber::open(), vp1394TwoGrabber::resetBus(), vp1394CMUGrabber::vp1394CMUGrabber(), vp1394TwoGrabber::vp1394TwoGrabber(), vpDiskGrabber::vpDiskGrabber(), and vpV4l2Grabber::vpV4l2Grabber().

unsigned int vpFrameGrabber::width

protectedinherited

Number of columns in the image.

Definition at line 114 of file vpFrameGrabber.h.

Referenced by vpDiskGrabber::acquire(), vpV4l2Grabber::acquire(), vp1394TwoGrabber::acquire(), vp1394TwoGrabber::dequeue(), vp1394TwoGrabber::getWidth(), vpDiskGrabber::open(), vpV4l2Grabber::open(), vpVideoReader::open(), vp1394CMUGrabber::open(), vp1394TwoGrabber::setFormat7ROI(), vp1394CMUGrabber::setVideoMode(), vp1394TwoGrabber::setVideoMode(), vp1394CMUGrabber::vp1394CMUGrabber(), and vp1394TwoGrabber::vp1394TwoGrabber().