x11grab.c File Reference

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Detailed Description

X11 frame device demuxer by Clemens Fruhwirth <clemens@endorphin.org> and Edouard Gomez <ed.gomez@free.fr>.

Definition in file x11grab.c.

Go to the source code of this file.

Classes
struct	x11_grab_s
	X11 Device Demuxer context. More...
Typedefs
typedef struct x11_grab_s	x11_grab_t
Functions
static int	x11grab_read_header (AVFormatContext *s1, AVFormatParameters *ap)
	Initializes the x11 grab device demuxer (public device demuxer API).
static void	get_pointer_coordinates (int *x, int *y, Display *dpy, AVFormatContext *s1)
	Get pointer coordinates from X11.
static void	apply_masks (uint8_t *dst, int and, int or, int bits_per_pixel)
	Mouse painting helper function that applies an 'and' and 'or' mask pair to '*dst' pixel.
static void	paint_mouse_pointer (XImage *image, x11_grab_t *s, int x, int y)
	Paints a mouse pointer in an X11 image.
static int	xget_zpixmap (Display *dpy, Drawable d, XImage *image, int x, int y)
	Reads new data in the image structure.
static int	x11grab_read_packet (AVFormatContext *s1, AVPacket *pkt)
	Grabs a frame from x11 (public device demuxer API).
static int	x11grab_read_close (AVFormatContext *s1)
	Closes x11 frame grabber (public device demuxer API).
Variables
AVInputFormat	x11_grab_device_demuxer
	x11 grabber device demuxer declaration

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Typedef Documentation

typedef struct x11_grab_s x11_grab_t

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Function Documentation

static int x11grab_read_header	(	AVFormatContext *	s1,
		AVFormatParameters *	ap
	)			[static]

Initializes the x11 grab device demuxer (public device demuxer API).

Parameters:

	s1	Context from avformat core
	ap	Parameters from avformat core

Returns:

• AVERROR(ENOMEM) no memory left
• AVERROR(EIO) other failure case
• 0 success

Definition at line 88 of file x11grab.c.

static void get_pointer_coordinates	(	int *	x,
		int *	y,
		Display *	dpy,
		AVFormatContext *	s1
	)			[static]

Get pointer coordinates from X11.

Parameters:

	x	Integer where horizontal coordinate will be returned
	y	Integer where vertical coordinate will be returned
	dpy	X11 display from where pointer coordinates are retrieved
	s1	Context used for logging errors if necessary

Definition at line 252 of file x11grab.c.

Referenced by x11grab_read_packet().

static void apply_masks	(	uint8_t *	dst,
		int	and,
		int	or,
		int	bits_per_pixel
	)			[inline, static]

Mouse painting helper function that applies an 'and' and 'or' mask pair to '*dst' pixel.

It actually draws a mouse pointer pixel to grabbed frame.

Parameters:

	dst	Destination pixel
	and	Part of the mask that must be applied using a bitwise 'and' operator
	or	Part of the mask that must be applied using a bitwise 'or' operator
	bits_per_pixel	Bits per pixel used in the grabbed image

Definition at line 284 of file x11grab.c.

Referenced by paint_mouse_pointer().

static void paint_mouse_pointer	(	XImage *	image,
		x11_grab_t *	s,
		int	x,
		int	y
	)			[static]

Paints a mouse pointer in an X11 image.

Parameters:

	image	Image where to paint the mouse pointer
	s	context used to retrieve original grabbing rectangle coordinates
	x	Mouse pointer coordinate
	y	Mouse pointer coordinate

Definition at line 309 of file x11grab.c.

Referenced by x11grab_read_packet().

static int xget_zpixmap	(	Display *	dpy,
		Drawable	d,
		XImage *	image,
		int	x,
		int	y
	)			[static]

Reads new data in the image structure.

Parameters:

	dpy	X11 display to grab from
	d
	image	Image where the grab will be put
	x	Top-Left grabbing rectangle horizontal coordinate
	y	Top-Left grabbing rectangle vertical coordinate

Returns:

0 if error, !0 if successful

Definition at line 388 of file x11grab.c.

Referenced by x11grab_read_packet().

static int x11grab_read_packet	(	AVFormatContext *	s1,
		AVPacket *	pkt
	)			[static]

Grabs a frame from x11 (public device demuxer API).

Parameters:

	s1	Context from avformat core
	pkt	Packet holding the brabbed frame

Returns:

frame size in bytes

Definition at line 432 of file x11grab.c.

static int x11grab_read_close

(

AVFormatContext *

s1

)

[static]

Closes x11 frame grabber (public device demuxer API).

Parameters:

s1

Context from avformat core

Returns:

0 success, !0 failure

Definition at line 496 of file x11grab.c.

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Variable Documentation

AVInputFormat x11_grab_device_demuxer

Initial value:

{
    "x11grab",
    "X11grab",
    sizeof(x11_grab_t),
    NULL,
    x11grab_read_header,
    x11grab_read_packet,
    x11grab_read_close,
    .flags = AVFMT_NOFILE,
}

x11 grabber device demuxer declaration

Definition at line 519 of file x11grab.c.