gdigrab.c File Reference

GDI frame device demuxer. More...

#include "config.h"
#include "libavformat/demux.h"
#include "libavformat/internal.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/time.h"
#include "libavutil/wchar_filename.h"
#include <windows.h>

Go to the source code of this file.

Data Structures
struct	gdigrab
	GDI Device Demuxer context. More...

Macros
#define	WIN32_API_ERROR(str)
#define	REGION_WND_BORDER   3
#define	CURSOR_ERROR(str)
#define	OFFSET(x)
#define	DEC   AV_OPT_FLAG_DECODING_PARAM

Functions
static LRESULT CALLBACK	gdigrab_region_wnd_proc (HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
	Callback to handle Windows messages for the region outline window.
static DWORD WINAPI	gdigrab_region_wnd_task (LPVOID opaque)
	Run the region outline window loop.
static int	gdigrab_region_wnd_init (struct gdigrab *gdigrab)
	Start the region outline window thread.
static void	gdigrab_region_wnd_destroy (AVFormatContext *s1, struct gdigrab *gdigrab)
	Cleanup/free the region outline window.
static int	gdigrab_read_header (AVFormatContext *s1)
	Initializes the gdi grab device demuxer (public device demuxer API).
static void	paint_mouse_pointer (AVFormatContext *s1, struct gdigrab *gdigrab)
	Paints a mouse pointer in a Win32 image.
static int	gdigrab_read_packet (AVFormatContext *s1, AVPacket *pkt)
	Grabs a frame from gdi (public device demuxer API).
static int	gdigrab_read_close (AVFormatContext *s1)
	Closes gdi frame grabber (public device demuxer API).

Variables
static const AVOption	options []
static const AVClass	gdigrab_class
const FFInputFormat	ff_gdigrab_demuxer
	gdi grabber device demuxer declaration

Detailed Description

GDI frame device demuxer.

Author

Calvin Walton calvi.nosp@m.n.wa.nosp@m.lton@.nosp@m.keps.nosp@m.tin.c.nosp@m.a

Christophe Gisquet word1.nosp@m..wor.nosp@m.d2@gm.nosp@m.ail..nosp@m.com

Definition in file gdigrab.c.

Macro Definition Documentation

WIN32_API_ERROR

#define WIN32_API_ERROR

(

str

)

Value:

    av_log(s1, AV_LOG_ERROR, str " (error %li)\n", GetLastError())

Definition at line 75 of file gdigrab.c.

Referenced by gdigrab_read_header(), and gdigrab_read_packet().

REGION_WND_BORDER

#define REGION_WND_BORDER   3

Definition at line 78 of file gdigrab.c.

Referenced by gdigrab_region_wnd_task().

CURSOR_ERROR

#define CURSOR_ERROR

(

str

)

Value:

    if (!gdigrab->cursor_error_printed) {       \
        WIN32_API_ERROR(str);             \
        gdigrab->cursor_error_printed = 1;      \
    }

Referenced by paint_mouse_pointer().

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(struct gdigrab, x)

Definition at line 688 of file gdigrab.c.

DEC

#define DEC   AV_OPT_FLAG_DECODING_PARAM

Definition at line 689 of file gdigrab.c.

Function Documentation

gdigrab_region_wnd_proc()

static LRESULT CALLBACK gdigrab_region_wnd_proc ( HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam )

static

Callback to handle Windows messages for the region outline window.

In particular, this handles painting the frame rectangle.

Parameters

hwnd	The region outline window handle.
msg	The Windows message.
wparam	First Windows message parameter.
lparam	Second Windows message parameter.

Returns

0 success, !0 failure

Definition at line 92 of file gdigrab.c.

Referenced by gdigrab_region_wnd_task().

gdigrab_region_wnd_task()

static DWORD WINAPI gdigrab_region_wnd_task ( LPVOID opaque )

static

Run the region outline window loop.

Parameters

opaque

gdigrab context.

Returns

0

Definition at line 126 of file gdigrab.c.

Referenced by gdigrab_region_wnd_init().

gdigrab_region_wnd_init()

static int gdigrab_region_wnd_init ( struct gdigrab * gdigrab )

static

Start the region outline window thread.

Parameters

gdigrab

gdigrab context.

Returns

0 success, !0 failure

Definition at line 207 of file gdigrab.c.

Referenced by gdigrab_read_header().

gdigrab_region_wnd_destroy()

static void gdigrab_region_wnd_destroy ( AVFormatContext * s1, struct gdigrab * gdigrab )

static

Cleanup/free the region outline window.

Parameters

s1	The format context.
gdigrab	gdigrab context.

Definition at line 242 of file gdigrab.c.

Referenced by gdigrab_read_close().

gdigrab_read_header()

static int gdigrab_read_header ( AVFormatContext * s1 )

static

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

Parameters

s1	Context from avformat core

Returns

AVERROR_IO error, 0 success

Definition at line 256 of file gdigrab.c.

paint_mouse_pointer()

static void paint_mouse_pointer ( AVFormatContext * s1, struct gdigrab * gdigrab )

static

Paints a mouse pointer in a Win32 image.

Parameters

s1	Context of the log information
s	Current grad structure

Definition at line 501 of file gdigrab.c.

Referenced by gdigrab_read_packet().

gdigrab_read_packet()

static int gdigrab_read_packet ( AVFormatContext * s1, AVPacket * pkt )

static

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

Parameters

s1	Context from avformat core
pkt	Packet holding the grabbed frame

Returns

frame size in bytes

Definition at line 589 of file gdigrab.c.

gdigrab_read_close()

static int gdigrab_read_close ( AVFormatContext * s1 )

static

Closes gdi frame grabber (public device demuxer API).

Parameters

s1	Context from avformat core

Returns

0 success, !0 failure

Definition at line 669 of file gdigrab.c.

Variable Documentation

options

const AVOption options[]

static

Initial value:

= {
    { "draw_mouse", "draw the mouse pointer", OFFSET(draw_mouse), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, DEC },
    { "show_region", "draw border around capture area", OFFSET(show_region), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC },
    { "framerate", "set video frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "ntsc"}, 0, INT_MAX, DEC },
    { "video_size", "set video frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
    { "offset_x", "capture area x offset", OFFSET(offset_x), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC },
    { "offset_y", "capture area y offset", OFFSET(offset_y), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC },
    { NULL },
}

Definition at line 690 of file gdigrab.c.

gdigrab_class

const AVClass gdigrab_class

static

Initial value:

= {
    .class_name = "GDIgrab indev",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
    .category   = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
}

Definition at line 700 of file gdigrab.c.

ff_gdigrab_demuxer

const FFInputFormat ff_gdigrab_demuxer

Initial value:

= {
    .p.name         = "gdigrab",
    .p.long_name    = NULL_IF_CONFIG_SMALL("GDI API Windows frame grabber"),
    .p.flags        = AVFMT_NOFILE,
    .p.priv_class   = &gdigrab_class,
    .priv_data_size = sizeof(struct gdigrab),
    .read_header    = gdigrab_read_header,
    .read_packet    = gdigrab_read_packet,
    .read_close     = gdigrab_read_close,
}

gdi grabber device demuxer declaration

Definition at line 709 of file gdigrab.c.