Public Member Functions

firevision::NetworkCamera Class Reference

Network camera. More...

#include <>>

Inheritance diagram for firevision::NetworkCamera:
Inheritance graph
[legend]

List of all members.

Public Member Functions

 NetworkCamera (const char *host, unsigned short port, bool jpeg=false)
 Constructor.
 NetworkCamera (const char *host, unsigned short port, const char *image_id, bool jpeg=false)
 Constructor.
 NetworkCamera (const CameraArgumentParser *cap)
 Constructor.
virtual ~NetworkCamera ()
 Destructor.
virtual void open ()
 Open the camera.
virtual void start ()
 Start image transfer from the camera.
virtual void stop ()
 Stop image transfer from the camera.
virtual void close ()
 Close camera.
virtual void flush ()
 Flush image queue.
virtual void capture ()
 Capture an image.
virtual void print_info ()
 Print out camera information.
virtual bool ready ()
 Camera is ready for taking pictures.
virtual unsigned char * buffer ()
 Get access to current image buffer.
virtual unsigned int buffer_size ()
 Size of buffer.
virtual void dispose_buffer ()
 Dispose current buffer.
virtual unsigned int pixel_width ()
 Width of image in pixels.
virtual unsigned int pixel_height ()
 Height of image in pixels.
virtual colorspace_t colorspace ()
 Colorspace of returned image.
virtual void set_image_id (const char *image_id)
 Select the image that is opened.
virtual void set_image_number (unsigned int n)
 Set image number to retrieve.
virtual fawkes::Timecapture_time ()
 Get the Time of the last successfully captured image.
virtual std::vector
< FUSE_imageinfo_t > & 
image_list ()
 List the available images.
virtual void fuse_invalid_server_version (uint32_t local_version, uint32_t remote_version) throw ()
 Invalid version string received.
virtual void fuse_connection_established () throw ()
 Connection has been established.
virtual void fuse_connection_died () throw ()
 Connection died.
virtual void fuse_inbound_received (FuseNetworkMessage *m) throw ()
 Message received.

Detailed Description

Network camera.

Retrieve images via network (FUSE).

See also:
FuseClient
Author:
Tim Niemueller

Definition at line 42 of file net.h.


Constructor & Destructor Documentation

firevision::NetworkCamera::NetworkCamera ( const char *  host,
unsigned short  port,
bool  jpeg = false 
)

Constructor.

Allows to initiate a NetworkCamera w/o specifying an image id. This can be done later with the set_image_id() method.

Parameters:
host host to connect to
port port to connect to
jpeg if true jpeg images will be transferred and automatically be decompressed, otherwise raw images are transferred

Definition at line 63 of file net.cpp.

firevision::NetworkCamera::NetworkCamera ( const char *  host,
unsigned short  port,
const char *  image_id,
bool  jpeg = false 
)

Constructor.

Parameters:
host host to connect to
port port to connect to
image_id image ID of image to retrieve
jpeg if true jpeg images will be transferred and automatically be decompressed, otherwise raw images are transferred

Definition at line 98 of file net.cpp.

firevision::NetworkCamera::NetworkCamera ( const CameraArgumentParser cap  ) 

Constructor.

Initialize with parameters from camera argument parser, supported values are:

  • host=HOST, hostname or IP of host to connect to
  • port=PORT, port number to connect to
  • image=ID, image ID of image to retrieve
  • jpeg=<true|false>, if true JPEGs are recieved and decompressed otherwise raw images will be transferred (raw is the default)
    Parameters:
    cap camera argument parser

Definition at line 140 of file net.cpp.

References firevision::CameraArgumentParser::get(), and firevision::CameraArgumentParser::has().

firevision::NetworkCamera::~NetworkCamera (  )  [virtual]

Destructor.

Definition at line 184 of file net.cpp.

References close().


Member Function Documentation

unsigned char * firevision::NetworkCamera::buffer (  )  [virtual]

Get access to current image buffer.

This will return a pointer to the current buffer. The buffer contains an image of the given colorspace, width and height.

Returns:
pointer to image buffer

Implements firevision::Camera.

Definition at line 281 of file net.cpp.

References firevision::FuseImageContent::buffer().

unsigned int firevision::NetworkCamera::buffer_size (  )  [virtual]

Size of buffer.

Gets the size in bytes of the buffer returned by buffer().

Returns:
size of buffer in bytes

Implements firevision::Camera.

Definition at line 295 of file net.cpp.

References firevision::FuseImageContent::colorspace(), firevision::FuseImageContent::pixel_height(), pixel_height(), firevision::FuseImageContent::pixel_width(), and pixel_width().

Referenced by capture().

void firevision::NetworkCamera::capture (  )  [virtual]

Capture an image.

Although cameras shall operate with a continuous image flow where possible sometimes capturing an image means copying a buffer or advancing a buffer list pointer. This shall be done in this method. For a camera-using application it is mandatory to call capture() just before accessing the image buffer.

Implements firevision::Camera.

Definition at line 238 of file net.cpp.

References firevision::FuseImageContent::buffer(), firevision::FuseImageContent::buffer_size(), buffer_size(), firevision::JpegImageDecompressor::decompress(), firevision::FuseClient::enqueue_and_wait(), firevision::FUSE_imagereq_message_t::format, firevision::FUSE_imagereq_message_t::image_id, firevision::FuseImageContent::pixel_height(), firevision::FuseImageContent::pixel_width(), firevision::ImageDecompressor::set_compressed_buffer(), and firevision::ImageDecompressor::set_decompressed_buffer().

fawkes::Time * firevision::NetworkCamera::capture_time (  )  [virtual]

Get the Time of the last successfully captured image.

Returns a Time representing the time when the last image was captured successfully. Note that calling this function is only valid after capture() and before dispose_buffer() has been called -- it is only valid when an image is currently available.

Returns:
Time of the currently processed image. The pointer shall be valid at least until the next call to dispose_buffer().
Exceptions:
NotImplementedException thrown if Camera does not support time stamping

Reimplemented from firevision::Camera.

Definition at line 361 of file net.cpp.

References firevision::FuseImageContent::capture_time().

void firevision::NetworkCamera::close (  )  [virtual]

Close camera.

This closes the camera device. The camera must have been stopped before calling close().

Implements firevision::Camera.

Definition at line 311 of file net.cpp.

References fawkes::Thread::cancel(), firevision::FuseClient::disconnect(), dispose_buffer(), fawkes::Thread::join(), and stop().

Referenced by ~NetworkCamera().

colorspace_t firevision::NetworkCamera::colorspace (  )  [virtual]

Colorspace of returned image.

Returns:
colorspace of image returned by buffer()

Implements firevision::Camera.

Definition at line 411 of file net.cpp.

References firevision::FUSE_imageinfo_t::colorspace.

void firevision::NetworkCamera::dispose_buffer (  )  [virtual]

Dispose current buffer.

Some cameras need disposal of the current buffer (for example to free space in a queue to retrieve the next image). This is done with this method. It has to be called after all work has been done on the image as desired. After dispose_buffer() has been called no further access may happen to the image buffer or undesired behavior may happen.

Implements firevision::Camera.

Definition at line 330 of file net.cpp.

References fawkes::RefCount::unref().

Referenced by close(), and flush().

void firevision::NetworkCamera::flush (  )  [virtual]

Flush image queue.

Some cameras may have an image buffer queue. With this it can happen that if the processing of an image took longer than desired it is needed to flush this buffer queue.

Implements firevision::Camera.

Definition at line 371 of file net.cpp.

References dispose_buffer().

void firevision::NetworkCamera::fuse_connection_died (  )  throw () [virtual]

Connection died.

Implements firevision::FuseClientHandler.

Definition at line 460 of file net.cpp.

void firevision::NetworkCamera::fuse_connection_established (  )  throw () [virtual]

Connection has been established.

Implements firevision::FuseClientHandler.

Definition at line 453 of file net.cpp.

void firevision::NetworkCamera::fuse_inbound_received ( FuseNetworkMessage m  )  throw () [virtual]

Message received.

An incoming message has been received and can now be processed. Note that if you want to work on the message after this method has finished you have to reference the message by calling FuseMessage::ref()!

Parameters:
m message to handle

Implements firevision::FuseClientHandler.

Definition at line 467 of file net.cpp.

References firevision::FUSE_imageinfo_t::buffer_size, firevision::FUSE_imageinfo_t::colorspace, firevision::FuseImageListContent::has_next(), firevision::FUSE_imageinfo_t::height, firevision::FUSE_imageinfo_t::image_id, firevision::FuseImageListContent::next(), and firevision::FUSE_imageinfo_t::width.

void firevision::NetworkCamera::fuse_invalid_server_version ( uint32_t  local_version,
uint32_t  remote_version 
) throw () [virtual]

Invalid version string received.

The remote end has a different incompatible FUSE version.

Parameters:
local_version version that the FuseClient speaks
remote_version version that the remote FUSE server speaks.

Implements firevision::FuseClientHandler.

Definition at line 444 of file net.cpp.

std::vector< FUSE_imageinfo_t > & firevision::NetworkCamera::image_list (  )  [virtual]

List the available images.

Returns:
a vector containing information about the available images

Definition at line 429 of file net.cpp.

References firevision::FuseClient::enqueue_and_wait().

void firevision::NetworkCamera::open (  )  [virtual]

Open the camera.

The camera is opened, but image transfer not yet started. This can be used to detect general problems with the camera while delaying the real transfer startup until it is needed.

Implements firevision::Camera.

Definition at line 196 of file net.cpp.

References firevision::FuseClient::connect(), firevision::FuseClient::enqueue_and_wait(), firevision::FUSE_imagedesc_message_t::image_id, fawkes::Thread::start(), and firevision::FuseClient::wait_greeting().

unsigned int firevision::NetworkCamera::pixel_height (  )  [virtual]

Height of image in pixels.

Returns:
height of image in pixels

Implements firevision::Camera.

Definition at line 351 of file net.cpp.

References firevision::FUSE_imageinfo_t::height.

Referenced by buffer_size().

unsigned int firevision::NetworkCamera::pixel_width (  )  [virtual]

Width of image in pixels.

Returns:
width of image in pixels

Implements firevision::Camera.

Definition at line 341 of file net.cpp.

References firevision::FUSE_imageinfo_t::width.

Referenced by buffer_size().

void firevision::NetworkCamera::print_info (  )  [virtual]

Print out camera information.

Shall print out camera information and current setup information on stdout.

Implements firevision::Camera.

Definition at line 232 of file net.cpp.

bool firevision::NetworkCamera::ready (  )  [virtual]

Camera is ready for taking pictures.

The camera has been opened and started correctly and may now provide images.

Returns:
true, if the camera is ready, false otherwise

Implements firevision::Camera.

Definition at line 379 of file net.cpp.

void firevision::NetworkCamera::set_image_id ( const char *  image_id  )  [virtual]

Select the image that is opened.

Parameters:
image_id the image id

Definition at line 389 of file net.cpp.

References firevision::FuseClient::enqueue_and_wait(), and firevision::FUSE_imagedesc_message_t::image_id.

void firevision::NetworkCamera::set_image_number ( unsigned int  n  )  [virtual]

Set image number to retrieve.

If a camera is able to retrieve several images this method can be used to select the image to be retrieved with the next call to capture().

Parameters:
n image number to set

Implements firevision::Camera.

Definition at line 404 of file net.cpp.

void firevision::NetworkCamera::start (  )  [virtual]

Start image transfer from the camera.

For many cameras opening the camera and starting transmission of images are two tasks. This method will simply initiate the transfer after the camera as been opened. And exception shall be thrown if the camera has not been opened.

Implements firevision::Camera.

Definition at line 219 of file net.cpp.

void firevision::NetworkCamera::stop (  )  [virtual]

Stop image transfer from the camera.

This will stop the image transfer initiated with start(). This can be used to start and stop the image transfer at will without opening and closing operations inbetween.

Implements firevision::Camera.

Definition at line 225 of file net.cpp.

Referenced by close().


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