streamerSource Class Reference

Interacts with LIBAV and other relevant libraries to read video data from USB. More...

#include <video.hpp>

Public Member Functions
void	close_device ()
void	close_video_capture ()
int	close_video_file (string filename)
void	errno_exit (const char *s)
void	init_device (int image_width, int image_height)
int	init_mjpeg_decoder (int image_width, int image_height)
void	init_mmap ()
void	init_read (unsigned int buffer_size)
void	init_userp (unsigned int buffer_size)
void	initialize_video_source ()
void	mjpeg2rgb (char MJPEG, int len, char RGB, int NumPixels)
void	open_device ()
void	process_image (const void src, int len, usb_cam_camera_image_t dest)
int	read_frame ()
int	setup_video_capture (string devicename, int &deviceWidth, int &deviceHeight, bool verbose=false)
int	setup_video_file (string filename)
void	start_capturing ()
void	stop_capturing ()
void	uninit_device ()
void	usb_cam_camera_grab_image ()
void	usb_cam_camera_shutdown (void)
void	usb_cam_camera_start (const char *dev, usb_cam_io_method io, usb_cam_pixel_format pf, int width, int height)
void	uyvy2rgb (char YUV, char RGB, int NumPixels)
int	xioctl (int fd, int request, void *arg)
void	YUV2RGB (const unsigned char y, const unsigned char u, const unsigned char v, unsigned char r, unsigned char g, unsigned char *b)
void	yuyv2rgb (char YUV, char RGB, int NumPixels)
Public Attributes
AVCodec *	avcodec
AVCodecContext *	avcodec_context
AVFrame *	avframe_camera
int	avframe_camera_size
AVFrame *	avframe_rgb
int	avframe_rgb_size
int	bImgFormat
int	bQuality
int	bRet
uint8_t *	buffer
struct usb_buffer *	buffers
char *	camera_dev
int	fd
FILE *	fdJPEG
int	fFrame
int	frameFinished
int	i
usb_cam_camera_image_t *	image
usb_cam_io_method	io
int	ix
int	ixInputStream
unsigned int	n_buffers
int	numBytes
AVPacket	oPacket
AVPacket	packet
AVCodec *	pCodec
AVCodecContext *	pCodecCtx
AVFrame *	pFrame
AVFrame *	pFrameRGB
AVCodec *	pICodec
AVCodecContext *	pICodecCtx
AVInputFormat *	pIFormat
AVFormatContext *	pIFormatCtx
unsigned int	pixelformat
AVCodec *	pOCodec
AVCodecContext *	pOCodecCtx
int	szBuffer
int	szBufferActual
struct SwsContext *	video_sws
uint8_t *	videoBuffer
int	videoStream

Detailed Description

Interacts with LIBAV and other relevant libraries to read video data from USB.

Definition at line 50 of file video.hpp.

Member Function Documentation

void streamerSource::close_device ( )

Definition at line 978 of file video.cpp.

void streamerSource::close_video_capture ( )

Definition at line 153 of file video.cpp.

int streamerSource::close_video_file ( string filename )

Definition at line 33 of file video.cpp.

void streamerSource::errno_exit ( const char * s )

Definition at line 304 of file video.cpp.

void streamerSource::init_device	(	int	image_width,
		int	image_height
	)

Definition at line 867 of file video.cpp.

int streamerSource::init_mjpeg_decoder	(	int	image_width,
		int	image_height
	)

Definition at line 436 of file video.cpp.

void streamerSource::init_mmap ( void )

Definition at line 758 of file video.cpp.

void streamerSource::init_read ( unsigned int buffer_size )

Definition at line 732 of file video.cpp.

void streamerSource::init_userp ( unsigned int buffer_size )

Definition at line 824 of file video.cpp.

void streamerSource::initialize_video_source ( )

Definition at line 7 of file video.cpp.

void streamerSource::mjpeg2rgb	(	char *	MJPEG,
		int	len,
		char *	RGB,
		int	NumPixels
	)

Definition at line 471 of file video.cpp.

void streamerSource::open_device ( )

Definition at line 986 of file video.cpp.

void streamerSource::process_image	(	const void *	src,
		int	len,
		usb_cam_camera_image_t *	dest
	)

Definition at line 511 of file video.cpp.

int streamerSource::read_frame ( )

Definition at line 521 of file video.cpp.

int streamerSource::setup_video_capture	(	string	devicename,
		int &	deviceWidth,
		int &	deviceHeight,
		bool	verbose = `false`
	)

Definition at line 159 of file video.cpp.

int streamerSource::setup_video_file ( string filename )

Definition at line 49 of file video.cpp.

void streamerSource::start_capturing ( void )

Definition at line 647 of file video.cpp.

void streamerSource::stop_capturing ( void )

Definition at line 625 of file video.cpp.

void streamerSource::uninit_device ( void )

Definition at line 708 of file video.cpp.

void streamerSource::usb_cam_camera_grab_image ( )

Definition at line 1062 of file video.cpp.

void streamerSource::usb_cam_camera_shutdown ( void )

Definition at line 1043 of file video.cpp.

void streamerSource::usb_cam_camera_start	(	const char *	dev,
		usb_cam_io_method	io,
		usb_cam_pixel_format	pf,
		int	width,
		int	height
	)

Definition at line 1008 of file video.cpp.

void streamerSource::uyvy2rgb	(	char *	YUV,
		char *	RGB,
		int	NumPixels
	)

Definition at line 393 of file video.cpp.

int streamerSource::xioctl	(	int	fd,
		int	request,
		void *	arg
	)

Definition at line 314 of file video.cpp.

void streamerSource::YUV2RGB	(	const unsigned char	y,
		const unsigned char	u,
		const unsigned char	v,
		unsigned char *	r,
		unsigned char *	g,
		unsigned char *	b
	)

Clip a value to the range 0<val<255. For speed this is done using an array, so can only cope with numbers in the range -128<val<383. Conversion from YUV to RGB. The normal conversion matrix is due to Julien (surname unknown):

[ R ] [ 1.0 0.0 1.403 ] [ Y ] [ G ] = [ 1.0 -0.344 -0.714 ] [ U ] [ B ] [ 1.0 1.770 0.0 ] [ V ]

and the firewire one is similar:

[ R ] [ 1.0 0.0 0.700 ] [ Y ] [ G ] = [ 1.0 -0.198 -0.291 ] [ U ] [ B ] [ 1.0 1.015 0.0 ] [ V ]

Corrected by BJT (coriander's transforms RGB->YUV and YUV->RGB do not get you back to the same RGB!) [ R ] [ 1.0 0.0 1.136 ] [ Y ] [ G ] = [ 1.0 -0.396 -0.578 ] [ U ] [ B ] [ 1.0 2.041 0.002 ] [ V ]

Definition at line 360 of file video.cpp.