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Add Win32 GDI-based screen grabbing
Based on original code by Christophe Gisquet in 2010, updated to work with current ffmpeg APIs. Supports grabbing a single window or an area of the screen, including support for multiple monitors (Windows does funky stuff with negative coordinates here). I've moved most of the configuration to AVOptions; the input file name is now only the string "desktop", or "title=<windowname>" to select a single window. The AVOptions are the same as x11grab where possible. Code has been added to support a "show_region" mode, like x11grab, which will draw a rectangle on the screen around the area being captured. Instead of duplicating code for paletted image handling, I make use of the GDI API's ability to output DIB (BMP) images, which can be run through ffmpeg's existing BMP decoder. Signed-off-by: Calvin Walton <calvin.walton@kepstin.ca> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
parent
f359bac27c
commit
08909fb56b
@ -14,6 +14,7 @@ version <next>:
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- QTKit input device
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- improvments to OpenEXR image decoder
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- support decoding 16-bit RLE SGI images
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- GDI screen grabbing for Windows
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version 2.2:
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5
configure
vendored
5
configure
vendored
@ -2349,6 +2349,9 @@ dv1394_indev_deps="dv1394"
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dv1394_indev_select="dv_demuxer"
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fbdev_indev_deps="linux_fb_h"
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fbdev_outdev_deps="linux_fb_h"
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gdigrab_indev_deps="CreateDIBSection"
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gdigrab_indev_extralibs="-lgdi32"
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gdigrab_indev_select="bmp_decoder"
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iec61883_indev_deps="libiec61883"
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jack_indev_deps="jack_jack_h sem_timedwait"
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lavfi_indev_deps="avfilter"
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@ -4741,6 +4744,8 @@ require Xext X11/extensions/XShm.h XShmCreateImage -lXext &&
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require Xfixes X11/extensions/Xfixes.h XFixesGetCursorImage -lXfixes &&
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{ enabled xlib || die "ERROR: Xlib not found"; }
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check_func_headers "windows.h" CreateDIBSection "$gdigrab_indev_extralibs"
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enabled vaapi &&
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check_lib va/va.h vaInitialize -lva ||
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disable vaapi
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@ -1088,6 +1088,7 @@ performance on systems without hardware floating point support).
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@item Video4Linux2 @tab X @tab X
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@item VfW capture @tab X @tab
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@item X11 grabbing @tab X @tab
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@item Win32 grabbing @tab X @tab
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@end multitable
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@code{X} means that input/output is supported.
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@ -192,6 +192,81 @@ ffmpeg -f fbdev -frames:v 1 -r 1 -i /dev/fb0 screenshot.jpeg
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See also @url{http://linux-fbdev.sourceforge.net/}, and fbset(1).
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@section gdigrab
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Win32 GDI-based screen capture device.
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This device allows you to capture a region of the display on Windows.
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There are two options for the input filename:
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@example
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desktop
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@end example
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or
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@example
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title=@var{window_title}
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@end example
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The first option will capture the entire desktop, or a fixed region of the
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desktop. The second option will instead capture the contents of a single
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window, regardless of its position on the screen.
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For example, to grab the entire desktop using @command{ffmpeg}:
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@example
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ffmpeg -f gdigrab -framerate 6 -i desktop out.mpg
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@end example
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Grab a 640x480 region at position @code{10,20}:
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@example
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ffmpeg -f gdigrab -framerate 6 -offset_x 10 -offset_y 20 -video_size vga -i desktop out.mpg
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@end example
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Grab the contents of the window named "Calculator"
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@example
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ffmpeg -f gdigrab -framerate 6 -i title=Calculator out.mpg
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@end example
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@subsection Options
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@table @option
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@item draw_mouse
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Specify whether to draw the mouse pointer. Use the value @code{0} to
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not draw the pointer. Default value is @code{1}.
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@item framerate
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Set the grabbing frame rate. Default value is @code{ntsc},
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corresponding to a frame rate of @code{30000/1001}.
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@item show_region
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Show grabbed region on screen.
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If @var{show_region} is specified with @code{1}, then the grabbing
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region will be indicated on screen. With this option, it is easy to
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know what is being grabbed if only a portion of the screen is grabbed.
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Note that @var{show_region} is incompatible with grabbing the contents
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of a single window.
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For example:
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@example
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ffmpeg -f gdigrab -show_region 1 -framerate 6 -video_size cif -offset_x 10 -offset_y 20 -i desktop out.mpg
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@end example
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@item video_size
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Set the video frame size. The default is to capture the full screen if @file{desktop} is selected, or the full window size if @file{title=@var{window_title}} is selected.
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@item offset_x
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When capturing a region with @var{video_size}, set the distance from the left edge of the screen or desktop.
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Note that the offset calculation is from the top left corner of the primary monitor on Windows. If you have a monitor positioned to the left of your primary monitor, you will need to use a negative @var{offset_x} value to move the region to that monitor.
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@item offset_y
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When capturing a region with @var{video_size}, set the distance from the top edge of the screen or desktop.
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Note that the offset calculation is from the top left corner of the primary monitor on Windows. If you have a monitor positioned above your primary monitor, you will need to use a negative @var{offset_y} value to move the region to that monitor.
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@end table
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@section iec61883
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FireWire DV/HDV input device using libiec61883.
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@ -26,6 +26,7 @@ OBJS-$(CONFIG_FBDEV_INDEV) += fbdev_dec.o \
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fbdev_common.o
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OBJS-$(CONFIG_FBDEV_OUTDEV) += fbdev_enc.o \
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fbdev_common.o
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OBJS-$(CONFIG_GDIGRAB_INDEV) += gdigrab.o
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OBJS-$(CONFIG_IEC61883_INDEV) += iec61883.o
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OBJS-$(CONFIG_JACK_INDEV) += jack_audio.o timefilter.o
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OBJS-$(CONFIG_LAVFI_INDEV) += lavfi.o
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@ -53,6 +53,7 @@ void avdevice_register_all(void)
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REGISTER_INDEV (DSHOW, dshow);
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REGISTER_INDEV (DV1394, dv1394);
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REGISTER_INOUTDEV(FBDEV, fbdev);
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REGISTER_INDEV (GDIGRAB, gdigrab);
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REGISTER_INDEV (IEC61883, iec61883);
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REGISTER_INDEV (JACK, jack);
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REGISTER_INDEV (LAVFI, lavfi);
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630
libavdevice/gdigrab.c
Normal file
630
libavdevice/gdigrab.c
Normal file
@ -0,0 +1,630 @@
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/*
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* GDI video grab interface
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*
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* This file is part of FFmpeg.
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*
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* Copyright (C) 2013 Calvin Walton <calvin.walton@kepstin.ca>
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* Copyright (C) 2007-2010 Christophe Gisquet <word1.word2@gmail.com>
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1
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* of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* GDI frame device demuxer
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* @author Calvin Walton <calvin.walton@kepstin.ca>
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* @author Christophe Gisquet <word1.word2@gmail.com>
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*/
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#include "config.h"
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#include "libavformat/internal.h"
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#include "libavutil/opt.h"
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#include "libavutil/time.h"
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#include <windows.h>
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/**
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* GDI Device Demuxer context
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*/
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struct gdigrab {
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const AVClass *class; /**< Class for private options */
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int frame_size; /**< Size in bytes of the frame pixel data */
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int header_size; /**< Size in bytes of the DIB header */
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AVRational time_base; /**< Time base */
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int64_t time_frame; /**< Current time */
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int draw_mouse; /**< Draw mouse cursor (private option) */
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int show_region; /**< Draw border (private option) */
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AVRational framerate; /**< Capture framerate (private option) */
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int width; /**< Width of the grab frame (private option) */
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int height; /**< Height of the grab frame (private option) */
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int offset_x; /**< Capture x offset (private option) */
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int offset_y; /**< Capture y offset (private option) */
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HWND hwnd; /**< Handle of the window for the grab */
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HDC source_hdc; /**< Source device context */
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HDC dest_hdc; /**< Destination, source-compatible DC */
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BITMAPINFO bmi; /**< Information describing DIB format */
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HBITMAP hbmp; /**< Information on the bitmap captured */
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void *buffer; /**< The buffer containing the bitmap image data */
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RECT clip_rect; /**< The subarea of the screen or window to clip */
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HWND region_hwnd; /**< Handle of the region border window */
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int cursor_error_printed;
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};
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#define WIN32_API_ERROR(str) \
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av_log(s1, AV_LOG_ERROR, str " (error %li)\n", GetLastError())
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#define REGION_WND_BORDER 3
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/**
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* Callback to handle Windows messages for the region outline window.
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*
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* In particular, this handles painting the frame rectangle.
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*
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* @param hwnd The region outline window handle.
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* @param msg The Windows message.
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* @param wparam First Windows message parameter.
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* @param lparam Second Windows message parameter.
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* @return 0 success, !0 failure
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*/
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static LRESULT CALLBACK
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gdigrab_region_wnd_proc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
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{
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PAINTSTRUCT ps;
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HDC hdc;
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RECT rect;
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switch (msg) {
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case WM_PAINT:
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hdc = BeginPaint(hwnd, &ps);
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GetClientRect(hwnd, &rect);
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FrameRect(hdc, &rect, GetStockObject(BLACK_BRUSH));
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rect.left++; rect.top++; rect.right--; rect.bottom--;
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FrameRect(hdc, &rect, GetStockObject(WHITE_BRUSH));
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rect.left++; rect.top++; rect.right--; rect.bottom--;
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FrameRect(hdc, &rect, GetStockObject(BLACK_BRUSH));
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EndPaint(hwnd, &ps);
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break;
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default:
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return DefWindowProc(hwnd, msg, wparam, lparam);
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}
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return 0;
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}
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/**
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* Initialize the region outline window.
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*
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* @param s1 The format context.
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* @param gdigrab gdigrab context.
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* @return 0 success, !0 failure
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*/
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static int
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gdigrab_region_wnd_init(AVFormatContext *s1, struct gdigrab *gdigrab)
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{
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HWND hwnd;
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RECT rect = gdigrab->clip_rect;
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HRGN region = NULL;
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HRGN region_interior = NULL;
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DWORD style = WS_POPUP | WS_VISIBLE;
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DWORD ex = WS_EX_TOOLWINDOW | WS_EX_TOPMOST | WS_EX_TRANSPARENT;
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rect.left -= REGION_WND_BORDER; rect.top -= REGION_WND_BORDER;
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rect.right += REGION_WND_BORDER; rect.bottom += REGION_WND_BORDER;
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AdjustWindowRectEx(&rect, style, FALSE, ex);
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// Create a window with no owner; use WC_DIALOG instead of writing a custom
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// window class
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hwnd = CreateWindowEx(ex, WC_DIALOG, NULL, style, rect.left, rect.top,
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rect.right - rect.left, rect.bottom - rect.top,
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NULL, NULL, NULL, NULL);
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if (!hwnd) {
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WIN32_API_ERROR("Could not create region display window");
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goto error;
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}
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// Set the window shape to only include the border area
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GetClientRect(hwnd, &rect);
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region = CreateRectRgn(0, 0,
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rect.right - rect.left, rect.bottom - rect.top);
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region_interior = CreateRectRgn(REGION_WND_BORDER, REGION_WND_BORDER,
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rect.right - rect.left - REGION_WND_BORDER,
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rect.bottom - rect.top - REGION_WND_BORDER);
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CombineRgn(region, region, region_interior, RGN_DIFF);
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if (!SetWindowRgn(hwnd, region, FALSE)) {
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WIN32_API_ERROR("Could not set window region");
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goto error;
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}
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// The "region" memory is now owned by the window
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region = NULL;
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DeleteObject(region_interior);
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SetWindowLongPtr(hwnd, GWLP_WNDPROC, (LONG_PTR) gdigrab_region_wnd_proc);
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ShowWindow(hwnd, SW_SHOW);
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gdigrab->region_hwnd = hwnd;
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return 0;
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error:
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if (region)
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DeleteObject(region);
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if (region_interior)
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DeleteObject(region_interior);
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if (hwnd)
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DestroyWindow(hwnd);
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return 1;
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}
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/**
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* Cleanup/free the region outline window.
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*
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* @param s1 The format context.
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* @param gdigrab gdigrab context.
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*/
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static void
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gdigrab_region_wnd_destroy(AVFormatContext *s1, struct gdigrab *gdigrab)
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{
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if (gdigrab->region_hwnd)
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DestroyWindow(gdigrab->region_hwnd);
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gdigrab->region_hwnd = NULL;
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}
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/**
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* Process the Windows message queue.
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*
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* This is important to prevent Windows from thinking the window has become
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* unresponsive. As well, things like WM_PAINT (to actually draw the window
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* contents) are handled from the message queue context.
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*
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* @param s1 The format context.
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* @param gdigrab gdigrab context.
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*/
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static void
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gdigrab_region_wnd_update(AVFormatContext *s1, struct gdigrab *gdigrab)
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{
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HWND hwnd = gdigrab->region_hwnd;
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MSG msg;
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while (PeekMessage(&msg, hwnd, 0, 0, PM_REMOVE)) {
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DispatchMessage(&msg);
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}
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}
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/**
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* Initializes the gdi grab device demuxer (public device demuxer API).
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*
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* @param s1 Context from avformat core
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* @return AVERROR_IO error, 0 success
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*/
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static int
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gdigrab_read_header(AVFormatContext *s1)
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{
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struct gdigrab *gdigrab = s1->priv_data;
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HWND hwnd;
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HDC source_hdc = NULL;
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HDC dest_hdc = NULL;
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BITMAPINFO bmi;
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HBITMAP hbmp = NULL;
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void *buffer = NULL;
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const char *filename = s1->filename;
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const char *name = NULL;
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AVStream *st = NULL;
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int bpp;
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RECT virtual_rect;
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RECT clip_rect;
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BITMAP bmp;
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int ret;
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if (!strncmp(filename, "title=", 6)) {
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name = filename + 6;
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hwnd = FindWindow(NULL, name);
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if (!hwnd) {
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av_log(s1, AV_LOG_ERROR,
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"Can't find window '%s', aborting.\n", name);
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ret = AVERROR(EIO);
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goto error;
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}
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if (gdigrab->show_region) {
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av_log(s1, AV_LOG_WARNING,
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"Can't show region when grabbing a window.\n");
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gdigrab->show_region = 0;
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}
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} else if (!strcmp(filename, "desktop")) {
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hwnd = NULL;
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} else {
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av_log(s1, AV_LOG_ERROR,
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"Please use \"desktop\" or \"title=<windowname>\" to specify your target.\n");
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ret = AVERROR(EIO);
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goto error;
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}
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if (hwnd) {
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GetClientRect(hwnd, &virtual_rect);
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} else {
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virtual_rect.left = GetSystemMetrics(SM_XVIRTUALSCREEN);
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virtual_rect.top = GetSystemMetrics(SM_YVIRTUALSCREEN);
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virtual_rect.right = virtual_rect.left + GetSystemMetrics(SM_CXVIRTUALSCREEN);
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virtual_rect.bottom = virtual_rect.top + GetSystemMetrics(SM_CYVIRTUALSCREEN);
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}
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/* If no width or height set, use full screen/window area */
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if (!gdigrab->width || !gdigrab->height) {
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clip_rect.left = virtual_rect.left;
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clip_rect.top = virtual_rect.top;
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clip_rect.right = virtual_rect.right;
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clip_rect.bottom = virtual_rect.bottom;
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} else {
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clip_rect.left = gdigrab->offset_x;
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clip_rect.top = gdigrab->offset_y;
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clip_rect.right = gdigrab->width + gdigrab->offset_x;
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clip_rect.bottom = gdigrab->height + gdigrab->offset_y;
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}
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if (clip_rect.left < virtual_rect.left ||
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clip_rect.top < virtual_rect.top ||
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clip_rect.right > virtual_rect.right ||
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clip_rect.bottom > virtual_rect.bottom) {
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av_log(s1, AV_LOG_ERROR,
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"Capture area (%li,%li),(%li,%li) extends outside window area (%li,%li),(%li,%li)",
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clip_rect.left, clip_rect.top,
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clip_rect.right, clip_rect.bottom,
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virtual_rect.left, virtual_rect.top,
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virtual_rect.right, virtual_rect.bottom);
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ret = AVERROR(EIO);
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goto error;
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}
|
||||
|
||||
/* This will get the device context for the selected window, or if
|
||||
* none, the primary screen */
|
||||
source_hdc = GetDC(hwnd);
|
||||
if (!source_hdc) {
|
||||
WIN32_API_ERROR("Couldn't get window device context");
|
||||
ret = AVERROR(EIO);
|
||||
goto error;
|
||||
}
|
||||
bpp = GetDeviceCaps(source_hdc, BITSPIXEL);
|
||||
|
||||
if (name) {
|
||||
av_log(s1, AV_LOG_INFO,
|
||||
"Found window %s, capturing %lix%lix%i at (%li,%li)\n",
|
||||
name,
|
||||
clip_rect.right - clip_rect.left,
|
||||
clip_rect.bottom - clip_rect.top,
|
||||
bpp, clip_rect.left, clip_rect.top);
|
||||
} else {
|
||||
av_log(s1, AV_LOG_INFO,
|
||||
"Capturing whole desktop as %lix%lix%i at (%li,%li)\n",
|
||||
clip_rect.right - clip_rect.left,
|
||||
clip_rect.bottom - clip_rect.top,
|
||||
bpp, clip_rect.left, clip_rect.top);
|
||||
}
|
||||
|
||||
if (clip_rect.right - clip_rect.left <= 0 ||
|
||||
clip_rect.bottom - clip_rect.top <= 0 || bpp%8) {
|
||||
av_log(s1, AV_LOG_ERROR, "Invalid properties, aborting\n");
|
||||
ret = AVERROR(EIO);
|
||||
goto error;
|
||||
}
|
||||
|
||||
dest_hdc = CreateCompatibleDC(source_hdc);
|
||||
if (!dest_hdc) {
|
||||
WIN32_API_ERROR("Screen DC CreateCompatibleDC");
|
||||
ret = AVERROR(EIO);
|
||||
goto error;
|
||||
}
|
||||
|
||||
/* Create a DIB and select it into the dest_hdc */
|
||||
bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
|
||||
bmi.bmiHeader.biWidth = clip_rect.right - clip_rect.left;
|
||||
bmi.bmiHeader.biHeight = -(clip_rect.bottom - clip_rect.top);
|
||||
bmi.bmiHeader.biPlanes = 1;
|
||||
bmi.bmiHeader.biBitCount = bpp;
|
||||
bmi.bmiHeader.biCompression = BI_RGB;
|
||||
bmi.bmiHeader.biSizeImage = 0;
|
||||
bmi.bmiHeader.biXPelsPerMeter = 0;
|
||||
bmi.bmiHeader.biYPelsPerMeter = 0;
|
||||
bmi.bmiHeader.biClrUsed = 0;
|
||||
bmi.bmiHeader.biClrImportant = 0;
|
||||
hbmp = CreateDIBSection(dest_hdc, &bmi, DIB_RGB_COLORS,
|
||||
&buffer, NULL, 0);
|
||||
if (!hbmp) {
|
||||
WIN32_API_ERROR("Creating DIB Section");
|
||||
ret = AVERROR(EIO);
|
||||
goto error;
|
||||
}
|
||||
|
||||
if (!SelectObject(dest_hdc, hbmp)) {
|
||||
WIN32_API_ERROR("SelectObject");
|
||||
ret = AVERROR(EIO);
|
||||
goto error;
|
||||
}
|
||||
|
||||
/* Get info from the bitmap */
|
||||
GetObject(hbmp, sizeof(BITMAP), &bmp);
|
||||
|
||||
st = avformat_new_stream(s1, NULL);
|
||||
if (!st) {
|
||||
ret = AVERROR(ENOMEM);
|
||||
goto error;
|
||||
}
|
||||
avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
|
||||
|
||||
gdigrab->frame_size = bmp.bmWidthBytes * bmp.bmHeight * bmp.bmPlanes;
|
||||
gdigrab->header_size = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) +
|
||||
(bpp <= 8 ? (1 << bpp) : 0) * sizeof(RGBQUAD) /* palette size */;
|
||||
gdigrab->time_base = av_inv_q(gdigrab->framerate);
|
||||
gdigrab->time_frame = av_gettime() / av_q2d(gdigrab->time_base);
|
||||
|
||||
gdigrab->hwnd = hwnd;
|
||||
gdigrab->source_hdc = source_hdc;
|
||||
gdigrab->dest_hdc = dest_hdc;
|
||||
gdigrab->hbmp = hbmp;
|
||||
gdigrab->bmi = bmi;
|
||||
gdigrab->buffer = buffer;
|
||||
gdigrab->clip_rect = clip_rect;
|
||||
|
||||
gdigrab->cursor_error_printed = 0;
|
||||
|
||||
if (gdigrab->show_region) {
|
||||
if (gdigrab_region_wnd_init(s1, gdigrab)) {
|
||||
ret = AVERROR(EIO);
|
||||
goto error;
|
||||
}
|
||||
}
|
||||
|
||||
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
|
||||
st->codec->codec_id = AV_CODEC_ID_BMP;
|
||||
st->codec->time_base = gdigrab->time_base;
|
||||
st->codec->bit_rate = (gdigrab->header_size + gdigrab->frame_size) * 1/av_q2d(gdigrab->time_base) * 8;
|
||||
|
||||
return 0;
|
||||
|
||||
error:
|
||||
if (source_hdc)
|
||||
ReleaseDC(hwnd, source_hdc);
|
||||
if (dest_hdc)
|
||||
DeleteDC(dest_hdc);
|
||||
if (hbmp)
|
||||
DeleteObject(hbmp);
|
||||
if (source_hdc)
|
||||
DeleteDC(source_hdc);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* Paints a mouse pointer in a Win32 image.
|
||||
*
|
||||
* @param s1 Context of the log information
|
||||
* @param s Current grad structure
|
||||
*/
|
||||
static void paint_mouse_pointer(AVFormatContext *s1, struct gdigrab *gdigrab)
|
||||
{
|
||||
CURSORINFO ci = {0};
|
||||
|
||||
#define CURSOR_ERROR(str) \
|
||||
if (!gdigrab->cursor_error_printed) { \
|
||||
WIN32_API_ERROR(str); \
|
||||
gdigrab->cursor_error_printed = 1; \
|
||||
}
|
||||
|
||||
ci.cbSize = sizeof(ci);
|
||||
|
||||
if (GetCursorInfo(&ci)) {
|
||||
HCURSOR icon = CopyCursor(ci.hCursor);
|
||||
ICONINFO info;
|
||||
POINT pos;
|
||||
RECT clip_rect = gdigrab->clip_rect;
|
||||
HWND hwnd = gdigrab->hwnd;
|
||||
|
||||
if (ci.flags != CURSOR_SHOWING)
|
||||
return;
|
||||
|
||||
if (!icon) {
|
||||
/* Use the standard arrow cursor as a fallback.
|
||||
* You'll probably only hit this in Wine, which can't fetch
|
||||
* the current system cursor. */
|
||||
icon = CopyCursor(LoadCursor(NULL, IDC_ARROW));
|
||||
}
|
||||
|
||||
if (!GetIconInfo(icon, &info)) {
|
||||
CURSOR_ERROR("Could not get icon info");
|
||||
goto icon_error;
|
||||
}
|
||||
|
||||
pos.x = ci.ptScreenPos.x - clip_rect.left - info.xHotspot;
|
||||
pos.y = ci.ptScreenPos.y - clip_rect.top - info.yHotspot;
|
||||
|
||||
if (hwnd) {
|
||||
RECT rect;
|
||||
|
||||
if (GetWindowRect(hwnd, &rect)) {
|
||||
pos.x -= rect.left;
|
||||
pos.y -= rect.top;
|
||||
} else {
|
||||
CURSOR_ERROR("Couldn't get window rectangle");
|
||||
goto icon_error;
|
||||
}
|
||||
}
|
||||
|
||||
av_log(s1, AV_LOG_DEBUG, "Cursor pos (%li,%li) -> (%li,%li)\n",
|
||||
ci.ptScreenPos.x, ci.ptScreenPos.y, pos.x, pos.y);
|
||||
|
||||
if (pos.x >= 0 && pos.x <= clip_rect.right - clip_rect.left &&
|
||||
pos.y >= 0 && pos.y <= clip_rect.bottom - clip_rect.top) {
|
||||
if (!DrawIcon(gdigrab->dest_hdc, pos.x, pos.y, icon))
|
||||
CURSOR_ERROR("Couldn't draw icon");
|
||||
}
|
||||
|
||||
icon_error:
|
||||
if (icon)
|
||||
DestroyCursor(icon);
|
||||
} else {
|
||||
CURSOR_ERROR("Couldn't get cursor info");
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Grabs a frame from gdi (public device demuxer API).
|
||||
*
|
||||
* @param s1 Context from avformat core
|
||||
* @param pkt Packet holding the grabbed frame
|
||||
* @return frame size in bytes
|
||||
*/
|
||||
static int gdigrab_read_packet(AVFormatContext *s1, AVPacket *pkt)
|
||||
{
|
||||
struct gdigrab *gdigrab = s1->priv_data;
|
||||
|
||||
HDC dest_hdc = gdigrab->dest_hdc;
|
||||
HDC source_hdc = gdigrab->source_hdc;
|
||||
RECT clip_rect = gdigrab->clip_rect;
|
||||
AVRational time_base = gdigrab->time_base;
|
||||
int64_t time_frame = gdigrab->time_frame;
|
||||
|
||||
BITMAPFILEHEADER bfh;
|
||||
int file_size = gdigrab->header_size + gdigrab->frame_size;
|
||||
|
||||
int64_t curtime, delay;
|
||||
|
||||
/* Calculate the time of the next frame */
|
||||
time_frame += INT64_C(1000000);
|
||||
|
||||
/* Run Window message processing queue */
|
||||
if (gdigrab->show_region)
|
||||
gdigrab_region_wnd_update(s1, gdigrab);
|
||||
|
||||
/* wait based on the frame rate */
|
||||
for (;;) {
|
||||
curtime = av_gettime();
|
||||
delay = time_frame * av_q2d(time_base) - curtime;
|
||||
if (delay <= 0) {
|
||||
if (delay < INT64_C(-1000000) * av_q2d(time_base)) {
|
||||
time_frame += INT64_C(1000000);
|
||||
}
|
||||
break;
|
||||
}
|
||||
if (s1->flags & AVFMT_FLAG_NONBLOCK) {
|
||||
return AVERROR(EAGAIN);
|
||||
} else {
|
||||
av_usleep(delay);
|
||||
}
|
||||
}
|
||||
|
||||
if (av_new_packet(pkt, file_size) < 0)
|
||||
return AVERROR(ENOMEM);
|
||||
pkt->pts = curtime;
|
||||
|
||||
/* Blit screen grab */
|
||||
if (!BitBlt(dest_hdc, 0, 0,
|
||||
clip_rect.right - clip_rect.left,
|
||||
clip_rect.bottom - clip_rect.top,
|
||||
source_hdc,
|
||||
clip_rect.left, clip_rect.top, SRCCOPY | CAPTUREBLT)) {
|
||||
WIN32_API_ERROR("Failed to capture image");
|
||||
return AVERROR(EIO);
|
||||
}
|
||||
if (gdigrab->draw_mouse)
|
||||
paint_mouse_pointer(s1, gdigrab);
|
||||
|
||||
/* Copy bits to packet data */
|
||||
|
||||
bfh.bfType = 0x4d42; /* "BM" in little-endian */
|
||||
bfh.bfSize = file_size;
|
||||
bfh.bfReserved1 = 0;
|
||||
bfh.bfReserved2 = 0;
|
||||
bfh.bfOffBits = gdigrab->header_size;
|
||||
|
||||
memcpy(pkt->data, &bfh, sizeof(bfh));
|
||||
|
||||
memcpy(pkt->data + sizeof(bfh), &gdigrab->bmi.bmiHeader, sizeof(gdigrab->bmi.bmiHeader));
|
||||
|
||||
if (gdigrab->bmi.bmiHeader.biBitCount <= 8)
|
||||
GetDIBColorTable(dest_hdc, 0, 1 << gdigrab->bmi.bmiHeader.biBitCount,
|
||||
(RGBQUAD *) (pkt->data + sizeof(bfh) + sizeof(gdigrab->bmi.bmiHeader)));
|
||||
|
||||
memcpy(pkt->data + gdigrab->header_size, gdigrab->buffer, gdigrab->frame_size);
|
||||
|
||||
gdigrab->time_frame = time_frame;
|
||||
|
||||
return gdigrab->header_size + gdigrab->frame_size;
|
||||
}
|
||||
|
||||
/**
|
||||
* Closes gdi frame grabber (public device demuxer API).
|
||||
*
|
||||
* @param s1 Context from avformat core
|
||||
* @return 0 success, !0 failure
|
||||
*/
|
||||
static int gdigrab_read_close(AVFormatContext *s1)
|
||||
{
|
||||
struct gdigrab *s = s1->priv_data;
|
||||
|
||||
if (s->show_region)
|
||||
gdigrab_region_wnd_destroy(s1, s);
|
||||
|
||||
if (s->source_hdc)
|
||||
ReleaseDC(s->hwnd, s->source_hdc);
|
||||
if (s->dest_hdc)
|
||||
DeleteDC(s->dest_hdc);
|
||||
if (s->hbmp)
|
||||
DeleteObject(s->hbmp);
|
||||
if (s->source_hdc)
|
||||
DeleteDC(s->source_hdc);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#define OFFSET(x) offsetof(struct gdigrab, x)
|
||||
#define DEC AV_OPT_FLAG_DECODING_PARAM
|
||||
static const AVOption options[] = {
|
||||
{ "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, 0, 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 },
|
||||
};
|
||||
|
||||
static const AVClass gdigrab_class = {
|
||||
.class_name = "GDIgrab indev",
|
||||
.item_name = av_default_item_name,
|
||||
.option = options,
|
||||
.version = LIBAVUTIL_VERSION_INT,
|
||||
};
|
||||
|
||||
/** gdi grabber device demuxer declaration */
|
||||
AVInputFormat ff_gdigrab_demuxer = {
|
||||
.name = "gdigrab",
|
||||
.long_name = NULL_IF_CONFIG_SMALL("GDI API Windows frame grabber"),
|
||||
.priv_data_size = sizeof(struct gdigrab),
|
||||
.read_header = gdigrab_read_header,
|
||||
.read_packet = gdigrab_read_packet,
|
||||
.read_close = gdigrab_read_close,
|
||||
.flags = AVFMT_NOFILE,
|
||||
.priv_class = &gdigrab_class,
|
||||
};
|
Loading…
Reference in New Issue
Block a user