CVD::V4LBuffer< T > Class Template Reference
[Video buffers]

#include <v4lbuffer.h>

Inheritance diagram for CVD::V4LBuffer< T >:

List of all members.

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Detailed Description

template<class T>
class CVD::V4LBuffer< T >

A live video buffer which uses the Video for Linux 2 (V4L2) API.

A replacement for the (deprecated?) V4L2Buffer

Definition at line 152 of file v4lbuffer.h.

Public Member Functions
	V4LBuffer (const std::string &dev, ImageRef size, int input=-1, bool fields=false, int frames_per_second=0, bool verbose=0)
virtual ImageRef	size ()
virtual VideoFrame< T > *	get_frame ()
virtual void	put_frame (VideoFrame< T > *f)
virtual bool	frame_pending ()
virtual double	frame_rate ()
virtual	~V4LBuffer ()
int	num_buffers ()
const std::string &	device_name () const
Classes
struct	V4LFrame

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Member Function Documentation

template<class T>

virtual ImageRef CVD::V4LBuffer< T >::size

(

)

[inline, virtual]

The size of the VideoFrames returned by this buffer.

Implements CVD::VideoBuffer< T >.

Definition at line 171 of file v4lbuffer.h.

References CVD::V4L::V4L2Client::getSize().

template<class T>

virtual VideoFrame<T>* CVD::V4LBuffer< 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 172 of file v4lbuffer.h.

References CVD::V4L::V4L2Client::Buffer::data, CVD::V4L::V4L2Client::getFrame(), CVD::V4L::V4L2Client::getSize(), CVD::V4L::V4L2Client::Buffer::id, and CVD::V4L::V4L2Client::Buffer::when.

template<class T>

virtual void CVD::V4LBuffer< 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 184 of file v4lbuffer.h.

References CVD::V4L::V4L2Client::releaseFrame().

template<class T>

virtual bool CVD::V4LBuffer< 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 200 of file v4lbuffer.h.

References CVD::V4L::V4L2Client::pendingFrame().

template<class T>

virtual double CVD::V4LBuffer< 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 201 of file v4lbuffer.h.

References CVD::V4L::V4L2Client::getRate().

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

• cvd/Linux/v4lbuffer.h

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