CVD::V4L1Buffer< T > Class Template Reference
[Video buffers]

#include <v4l1buffer.h>

Inheritance diagram for CVD::V4L1Buffer< T >:

List of all members.

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Detailed Description

template<class T>
class CVD::V4L1Buffer< T >

A video buffer from a v4l1 video device.

Parameters:

T

The pixel type of the frames. The supported type are <CVD::byte> which returns 8-bit grey scale and <CVD::bayer> which returns an 8-bit grey scale image containing the raw intensities of the sensor. You have to convert the returned image to a byte image or something else to use it in a meaningful way. <CVD::Rgb<CVD::byte> > should work to but crashes with my current driver ?! The pixel type used will automatically configure the underlying RawV4L1 object to use the right video palette.

Note:

The grey images are returned upside down unless the kernel module is loaded with the option flipvert.

frame_rate currently returns fixed 30 fps and frame_pending is untested.

Definition at line 190 of file v4l1buffer.h.

Public Member Functions
	V4L1Buffer (const std::string &dev)
	V4L1Buffer (const std::string &dev, ImageRef size)
virtual ImageRef	size ()
virtual VideoFrame< T > *	get_frame ()
virtual void	put_frame (VideoFrame< T > *f)
virtual bool	frame_pending ()
virtual double	frame_rate ()
virtual	~V4L1Buffer ()

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Constructor & Destructor Documentation

template<class T>

CVD::V4L1Buffer< T >::V4L1Buffer

(

const std::string &

dev

)

[inline]

Construct a video buffer.

Parameters:

dev

file name of the device to use

Definition at line 195 of file v4l1buffer.h.

template<class T>

CVD::V4L1Buffer< T >::V4L1Buffer	(	const std::string &	dev,
		ImageRef	size
	)			[inline]

Construct a video buffer.

Parameters:

	dev	file name of the device to use
	size	Size of the video stream to grab

Definition at line 203 of file v4l1buffer.h.

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Member Function Documentation

template<class T>

virtual ImageRef CVD::V4L1Buffer< T >::size

(

)

[inline, virtual]

The size of the VideoFrames returned by this buffer.

Implements CVD::VideoBuffer< T >.

Definition at line 208 of file v4l1buffer.h.

template<class T>

virtual VideoFrame<T>* CVD::V4L1Buffer< T >::get_frame

(

)

[inline, virtual]

Returns the next frame from the buffer. This function blocks until a frame is ready.

Implements CVD::VideoBuffer< T >.

Definition at line 212 of file v4l1buffer.h.

References CVD::cvd_timer::get_time(), and CVD::timer.

template<class T>

virtual void CVD::V4L1Buffer< T >::put_frame

(

VideoFrame< T > *

f

)

[inline, virtual]

Tell the buffer that you are finished with this frame.

Typically the VideoBuffer then destroys the frame.

Parameters:

f

The frame that you are finished with.

Implements CVD::VideoBuffer< T >.

Definition at line 216 of file v4l1buffer.h.

References CVD::SubImage< T >::data().

template<class T>

virtual bool CVD::V4L1Buffer< T >::frame_pending

(

)

[inline, virtual]

Is there a frame waiting in the buffer? This function does not block.

See is_live and is_flushable.

Implements CVD::VideoBuffer< T >.

Definition at line 221 of file v4l1buffer.h.

template<class T>

virtual double CVD::V4L1Buffer< T >::frame_rate

(

)

[inline, virtual]

What is the (expected) frame rate of this video buffer, in frames per second?

Implements CVD::VideoBuffer< T >.

Definition at line 225 of file v4l1buffer.h.

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The documentation for this class was generated from the following file:

• cvd/Linux/v4l1buffer.h

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