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>

1 files changed, 5 insertions, 0 deletions

diff --git a/configure b/configure
index 848dc7e1e6..46452ee443 100755
--- a/configure
+++ b/configure
@@ -2349,6 +2349,9 @@ dv1394_indev_deps="dv1394"
 dv1394_indev_select="dv_demuxer"
 fbdev_indev_deps="linux_fb_h"
 fbdev_outdev_deps="linux_fb_h"
+gdigrab_indev_deps="CreateDIBSection"
+gdigrab_indev_extralibs="-lgdi32"
+gdigrab_indev_select="bmp_decoder"
 iec61883_indev_deps="libiec61883"
 jack_indev_deps="jack_jack_h sem_timedwait"
 lavfi_indev_deps="avfilter"
@@ -4741,6 +4744,8 @@ require Xext X11/extensions/XShm.h XShmCreateImage -lXext &&
 require Xfixes X11/extensions/Xfixes.h XFixesGetCursorImage -lXfixes &&
 { enabled xlib || die "ERROR: Xlib not found"; }
 
+check_func_headers "windows.h" CreateDIBSection "$gdigrab_indev_extralibs"
+
 enabled vaapi &&
     check_lib va/va.h vaInitialize -lva ||
     disable vaapi