Example commands:
./ffmpeg -f x11grab -s cif -r 25 -i :0.0+10,20;showregion /tmp/out.mpg
./ffmpeg -f x11grab -s cif -r 25 -i ':0.0;followmouse;showregion'
/tmp/out.mpg
First one would draw a box around the grabbing region, second one, the
box will follow the mouse.
I use dashed lines because pure white or black lines sometimes are
hard to see, especially with webpages, which mostly with white
background.
Yu-Jie Lin
From a5e014ba768302395082251ee1cb947a0b61310e Mon Sep 17 00:00:00 2001
From: Yu-Jie Lin <[email protected]>
Date: Sat, 30 Jul 2011 19:13:43 +0800
Subject: [PATCH 2/2] x11grab: add showregion option.
Draw the current grabbing region for indication..
Signed-off-by: Yu-Jie Lin <[email protected]>
---
doc/ffmpeg.texi | 17 ++++++++
doc/indevs.texi | 14 ++++++-
libavdevice/x11grab.c | 102 +++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 132 insertions(+), 1 deletions(-)
diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi
index 9b3728b..f3a25eb 100644
--- a/doc/ffmpeg.texi
+++ b/doc/ffmpeg.texi
@@ -919,6 +919,23 @@ ffmpeg -f x11grab -s cif -r 25 -i ':0.0;followmouse=100' /tmp/out.mpg
variable. Grabbing region follows the mouse pointer, but only when mouse
pointer reaches within 100 pixels to the edge of grabbing region.
+@example
+ffmpeg -f x11grab -s cif -r 25 -i :0.0+10,20;showregion /tmp/out.mpg
+@end example
+
+0.0 is display.screen number of your X11 server, same as the DISPLAY environment
+variable. 10 is the x-offset and 20 the y-offset for the grabbing, also a
+grabbing region will be indicated on screen.
+
+@example
+ffmpeg -f x11grab -s cif -r 25 -i ':0.0;followmouse;showregion' /tmp/out.mpg
+@end example
+
+0.0 is display.screen number of your X11 server, same as the DISPLAY environment
+variable. Grabbing region follows the mouse pointer and a grabbing region
+will be indicated on screen.
+
+
@section Video and Audio file format conversion
Any supported file format and protocol can serve as input to ffmpeg:
diff --git a/doc/indevs.texi b/doc/indevs.texi
index 3876807..269f546 100644
--- a/doc/indevs.texi
+++ b/doc/indevs.texi
@@ -227,7 +227,7 @@ This device allows to capture a region of an X11 display.
The filename passed as input has the syntax:
@example
[@var{hostname}]:@var{display_number}.@var{screen_number}[+@var{x_offset},@var{y_offset}]
-[;followmouse[=@var{follow_mouse}]]
+[;followmouse[=@var{follow_mouse}]][;showregion]
@end example
@var{hostname}:@var{display_number}.@var{screen_number} specifies the
@@ -265,4 +265,16 @@ ffmpeg -f x11grab -r 25 -s cif -i ':0.0;followmouse' out.mpg
ffmpeg -f x11grab -r 25 -s cif -i ':0.0;followmouse=100' out.mpg
@end example
+If "showregion" is specified, then the grabbing region will be indicated on
+screen. With this option, it's easy to know what is being grabbed if only grab
+a portion of the screen.
+
+For example:
+@example
+ffmpeg -f x11grab -r 25 -s cif -i ':0.0+10,20;showregion' out.mpg
+
+# With followmouse
+ffmpeg -f x11grab -r 25 -s cif -i ':0.0;followmouse;showregion' out.mpg
+@end example
+
@c man end INPUT DEVICES
diff --git a/libavdevice/x11grab.c b/libavdevice/x11grab.c
index c04c198..326acf7 100644
--- a/libavdevice/x11grab.c
+++ b/libavdevice/x11grab.c
@@ -47,6 +47,7 @@
#include <X11/Xproto.h>
#include <X11/Xutil.h>
#include <sys/shm.h>
+#include <X11/extensions/shape.h>
#include <X11/extensions/XShm.h>
#include <X11/extensions/Xfixes.h>
@@ -72,9 +73,73 @@ struct x11_grab
XShmSegmentInfo shminfo; /**< When using XShm, keeps track of XShm infos */
int draw_mouse; /**< Set by a private option. */
int follow_mouse; /**< Set by a private option. */
+ int show_region; /**< set by a private option. */
+ Window region_win; /**< set by a private option. */
char *framerate; /**< Set by a private option. */
};
+#define REGION_WIN_BORDER 3
+/**
+ * Draw grabbing region window
+ *
+ * @param s x11_grab context
+ */
+static void
+x11grab_draw_region_win(struct x11_grab *s)
+{
+ Display *dpy = s->dpy;
+ int screen;
+ Window win = s->region_win;
+ GC gc;
+
+ screen = DefaultScreen(dpy);
+ gc = XCreateGC(dpy, win, 0, 0);
+ XSetForeground(dpy, gc, WhitePixel(dpy, screen));
+ XSetBackground(dpy, gc, BlackPixel(dpy, screen));
+ XSetLineAttributes(dpy, gc, 3, LineDoubleDash, 0, 0);
+ XDrawRectangle(dpy, win, gc,
+ 1, 1,
+ s->width + REGION_WIN_BORDER * 2 - 1 * 2 - 1,
+ s->height + REGION_WIN_BORDER * 2 - 1 * 2 - 1);
+ XFreeGC(dpy, gc);
+}
+
+/**
+ * Initialize grabbing region window
+ *
+ * @param s x11_grab context
+ */
+static void
+x11grab_region_win_init(struct x11_grab *s)
+{
+ Display *dpy = s->dpy;
+ int screen;
+ XSetWindowAttributes attribs;
+ XRectangle rect;
+
+ screen = DefaultScreen(dpy);
+ attribs.override_redirect = True;
+ s->region_win = XCreateWindow(
+ dpy, RootWindow(dpy, screen),
+ s->x_off - REGION_WIN_BORDER,
+ s->y_off - REGION_WIN_BORDER,
+ s->width + REGION_WIN_BORDER * 2,
+ s->height + REGION_WIN_BORDER * 2,
+ 0, CopyFromParent,
+ InputOutput, CopyFromParent,
+ CWOverrideRedirect, &attribs);
+ rect.x = 0;
+ rect.y = 0;
+ rect.width = s->width;
+ rect.height = s->height;
+ XShapeCombineRectangles(dpy, s->region_win,
+ ShapeBounding, REGION_WIN_BORDER, REGION_WIN_BORDER,
+ &rect, 1, ShapeSubtract, 0);
+ XMapWindow(dpy, s->region_win);
+ XSelectInput(dpy, s->region_win, ExposureMask | StructureNotifyMask);
+ x11grab_draw_region_win(s);
+}
+
/**
* Initialize the x11 grab device demuxer (public device demuxer API).
*
@@ -115,6 +180,8 @@ x11grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
x11grab->follow_mouse = -1;
sscanf(offset, ";followmouse=%d", &x11grab->follow_mouse);
}
+ x11grab->region_win = 0;
+ x11grab->show_region = !!strstr(param, ";showregion");
/* trim dpyname to only [hostname]:<display_number>.<screen_number> */
if (offset = strpbrk(param, "+;"))
*offset = 0;
@@ -165,6 +232,19 @@ x11grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
av_log(s1, AV_LOG_INFO, "followmouse is enabled, resetting grabbing region to x: %d y: %d\n", x_off, y_off);
}
+ screen = DefaultScreen(dpy);
+ screen_w = DisplayWidth(dpy, screen);
+ screen_h = DisplayHeight(dpy, screen);
+
+ if (x11grab->follow_mouse) {
+ XQueryPointer(dpy, RootWindow(dpy, screen), &w, &w, &x_off, &y_off, &ret, &ret, &ret);
+ x_off -= x11grab->width >> 1;
+ y_off -= x11grab->height >> 1;
+ x_off = FFMIN(FFMAX(x_off, 0), screen_w - x11grab->width);
+ y_off = FFMIN(FFMAX(y_off, 0), screen_h - x11grab->height);
+ av_log(s1, AV_LOG_INFO, "followmouse is enabled, resetting grabbing region to x: %d y: %d\n", x_off, y_off);
+ }
+
use_shm = XShmQueryExtension(dpy);
av_log(s1, AV_LOG_INFO, "shared memory extension %s found\n", use_shm ? "" : "not");
@@ -404,6 +484,7 @@ x11grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
int screen_h;
int x, y, _;
int follow_mouse = s->follow_mouse;
+ XEvent evt;
int64_t curtime, delay;
struct timespec ts;
@@ -458,6 +539,22 @@ x11grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
// adjust grabbing region position if it goes out of screen.
s->x_off = x_off = FFMIN(FFMAX(x_off, 0), screen_w - s->width);
s->y_off = y_off = FFMIN(FFMAX(y_off, 0), screen_h - s->height);
+
+ if (s->show_region && s->region_win)
+ XMoveWindow(dpy, s->region_win,
+ s->x_off - REGION_WIN_BORDER,
+ s->y_off - REGION_WIN_BORDER);
+ }
+
+ if (s->show_region) {
+ if (s->region_win) {
+ // clean up the events, and do the initinal draw or redraw.
+ for (evt.type = NoEventMask; XCheckMaskEvent(dpy, ExposureMask | StructureNotifyMask, &evt); );
+ if (evt.type)
+ x11grab_draw_region_win(s);
+ } else {
+ x11grab_region_win_init(s);
+ }
}
if(s->use_shm) {
@@ -501,6 +598,10 @@ x11grab_read_close(AVFormatContext *s1)
x11grab->image = NULL;
}
+ if (x11grab->region_win) {
+ XDestroyWindow(x11grab->dpy, x11grab->region_win);
+ }
+
/* Free X11 display */
XCloseDisplay(x11grab->dpy);
return 0;
@@ -513,6 +614,7 @@ static const AVOption options[] = {
{ "framerate", "", OFFSET(framerate), FF_OPT_TYPE_STRING, {.str = "ntsc"}, 0, 0, DEC },
{ "draw_mouse", "Draw the mouse pointer.", OFFSET(draw_mouse), FF_OPT_TYPE_INT, { 1 }, 0, 1, DEC },
{ "follow_mouse", "Follow the mouse pointer.", OFFSET(follow_mouse), FF_OPT_TYPE_INT, { 0 }, -1, INT_MAX, DEC },
+ { "show_region", "Show the grabbing region.", OFFSET(show_region), FF_OPT_TYPE_INT, { 0 }, 0, 1, DEC },
{ NULL },
};
--
1.7.3.4
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