DirectShow live video input stream support. More...

#include <vidl_dshow_live_istream.h>

Inheritance diagram for vidl_dshow_live_istream< ParamsObject >:

Public Member Functions
	vidl_dshow_live_istream ()
	Constructor - default.
	vidl_dshow_live_istream (const vcl_string &device_name)
	Constructor - from a string containing a device name.
	vidl_dshow_live_istream (const ParamsObject &params)
	Constructor - from a parameter object.
virtual	~vidl_dshow_live_istream ()
	Destructor.
virtual bool	is_open () const
	Return true if the stream is open for reading.
virtual bool	is_valid () const
	Return true if the stream is in a valid state.
virtual bool	is_seekable () const
	Return true if the stream support seeking.
virtual int	num_frames () const
	Return the number of frames if known.
virtual unsigned int	frame_number () const
	Return the current frame number.
virtual unsigned int	width () const
	Return the width of each frame.
virtual unsigned int	height () const
	Return the height of each frame.
virtual vidl_pixel_format	format () const
	Return the pixel format.
virtual double	frame_rate () const
	Return the frame rate (FPS, 0.0 if unspecified).
virtual double	duration () const
	Return the duration in seconds (0.0 if unknown).
virtual void	close ()
	Close the stream.
virtual bool	advance ()
	Advance to the next frame (but don't acquire an image).
virtual vidl_frame_sptr	read_frame ()
	Read the next frame from the stream (advance and acquire).
virtual vidl_frame_sptr	current_frame ()
	Return the current frame in the stream.
virtual bool	seek_frame (unsigned int frame_number)
	Seek to the given frame number.
void	run (void)
void	pause (void)
void	stop (void)
void	ref ()
	Increment reference count.
void	unref ()
	Decrement reference count.
int	ref_count () const
	Number of objects referring to this data.
Private Member Functions
	vidl_dshow_live_istream (const vidl_dshow_live_istream &)
vidl_dshow_live_istream &	operator= (const vidl_dshow_live_istream &)
void	connect (void)
	Connect to a device using its FriendlyName (in params_ object).
void	wait_for_state_change (HRESULT hr)
	If hr == S_FALSE, wait for the state change to complete.
bool	advance_wait ()
	Initiate advance and wait for completion; synchronous advance.
bool	advance_start ()
	Initiate advance and return immediately; asynchronous advance.
bool	is_frame_available () const
	Advance to the next frame (but don't acquire an image).
Private Attributes
ParamsObject	params_
	Parameters that define the input stream process.
sample_grabber_cb	sample_grabber_callback_
	***** Callback method...
CComPtr< IFilterGraph2 >	filter_graph_
CComPtr< IMoniker >	moniker_
CComPtr< IMediaControl >	media_control_
vidl_frame_sptr	buffer_
unsigned int	buffer_width_
unsigned int	buffer_height_
vidl_pixel_format	buffer_pixel_format_
bool	is_valid_
DWORD	register_
	ID in Running Object Table (ROT), for debugging with GraphEdit.

Detailed Description

template<class ParamsObject>
class vidl_dshow_live_istream< ParamsObject >

DirectShow live video input stream support.

This is still in an experimental stage, but should be usable. It should be able to open avi and wmv files as long as the system has the available decoder, in the case of compressed video.

DirectShow is very flexible and complex. Therefore we have taken the approach to throw an exception or abort in the case where something that is not supported fails, rather than try to parse through every error and provide an alternative. However, we welcome any feedback on desired features to make vidl_dshow_file_istream more usable in the VXL context.

Definition at line 83 of file vidl_dshow_live_istream.h.

Constructor & Destructor Documentation

template<class ParamsObject >

vidl_dshow_live_istream< ParamsObject >::vidl_dshow_live_istream ( void )

Constructor - default.

Definition at line 110 of file vidl_dshow_live_istream.cxx.

template<class ParamsObject >

vidl_dshow_live_istream< ParamsObject >::vidl_dshow_live_istream ( const vcl_string & device_name )

Constructor - from a string containing a device name.

Definition at line 131 of file vidl_dshow_live_istream.cxx.

template<class ParamsObject >

vidl_dshow_live_istream< ParamsObject >::vidl_dshow_live_istream ( const ParamsObject & params )

Constructor - from a parameter object.

Definition at line 141 of file vidl_dshow_live_istream.cxx.

template<class ParamsObject >

virtual vidl_dshow_live_istream< ParamsObject >::~vidl_dshow_live_istream ( ) [inline, virtual]

Destructor.

Definition at line 96 of file vidl_dshow_live_istream.h.

template<class ParamsObject >

vidl_dshow_live_istream< ParamsObject >::vidl_dshow_live_istream ( const vidl_dshow_live_istream< ParamsObject > & ) [private]

Member Function Documentation

template<class ParamsObject >

virtual bool vidl_dshow_live_istream< ParamsObject >::advance ( void ) [inline, virtual]

Advance to the next frame (but don't acquire an image).

Public Member Functions

Private Member Functions

Private Attributes

Detailed Description

template<class ParamsObject> class vidl_dshow_live_istream< ParamsObject >

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation

template<class ParamsObject>
class vidl_dshow_live_istream< ParamsObject >