xcbgrab: XCB-based screen capture
Matches the x11grab screen capture by features.
This commit is contained in:
Luca Barbato
parent
ed6dad3737
commit
a6674d2e77
@ -5,6 +5,7 @@ version <next>:
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- aliases and defaults for Ogg subtypes (opus, spx)
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- HEVC/H.265 RTP payload format (draft v6) packetizer and depacketizer
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- avplay now exits by default at the end of playback
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- XCB-based screen-grabber
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version 11:
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39
configure
vendored
39
configure
vendored
@ -210,10 +210,13 @@ External library support:
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--enable-libx264 enable H.264 encoding via x264 [no]
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--enable-libx265 enable HEVC encoding via x265 [no]
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--enable-libxavs enable AVS encoding via xavs [no]
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--enable-libxcb enable X11 grabbing using XCB [no]
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--enable-libxcb-shm enable X11 grabbing shm communication [auto]
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--enable-libxcb-xfixes enable X11 grabbing mouse rendering [auto]
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--enable-libxvid enable Xvid encoding via xvidcore,
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native MPEG-4/Xvid encoder exists [no]
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--enable-openssl enable openssl [no]
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--enable-x11grab enable X11 grabbing [no]
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--enable-x11grab enable X11 grabbing (legacy) [no]
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--enable-zlib enable zlib [autodetect]
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Toolchain options:
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@ -1170,6 +1173,9 @@ EXTERNAL_LIBRARY_LIST="
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libx264
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libx265
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libxavs
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libxcb
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libxcb_shm
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libxcb_xfixes
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libxvid
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openssl
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x11grab
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@ -2102,7 +2108,8 @@ sndio_outdev_deps="sndio_h"
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v4l2_indev_deps_any="linux_videodev2_h sys_videoio_h"
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vfwcap_indev_deps="capCreateCaptureWindow vfwcap_defines"
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vfwcap_indev_extralibs="-lavicap32"
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x11grab_indev_deps="x11grab XShmCreateImage"
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x11grab_indev_deps="x11grab"
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x11grab_xcb_indev_deps="libxcb"
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# protocols
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ffrtmpcrypt_protocol_deps="!librtmp_protocol"
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@ -4273,10 +4280,30 @@ fi
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check_lib X11/Xlib.h XOpenDisplay -lX11 && enable xlib
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enabled x11grab &&
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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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if enabled libxcb || enabled x11grab && ! disabled libxcb; then
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check_pkg_config xcb-event xcb/xcb.h xcb_connect || {
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enabled libxcb && die "ERROR: libxcb not found";
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} && disable x11grab && enable libxcb
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disabled libxcb_shm ||
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check_pkg_config xcb-shm xcb/shm.h xcb_shm_attach || {
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enabled libxcb_shm && die "ERROR: libxcb_shm not found";
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} && check_header sys/shm.h && enable libxcb_shm
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disabled libxcb_xfixes ||
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check_pkg_config xcb-xfixes xcb/xfixes.h xcb_xfixes_get_cursor_image || {
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enabled libxcb_xfixes && die "ERROR: libxcb_xfixes not found";
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} && enable libxcb_xfixes
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add_cflags "$xcb_event_cflags $xcb_shm_cflags $xcb_xfixes_cflags"
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add_extralibs "$xcb_event_libs $xcb_shm_libs $xcb_xfixes_libs"
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fi
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if enabled x11grab; then
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enabled xlib || die "ERROR: Xlib not found"
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require Xext X11/extensions/XShm.h XShmCreateImage -lXext
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require Xfixes X11/extensions/Xfixes.h XFixesGetCursorImage -lXfixes
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fi
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enabled vdpau &&
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check_cpp_condition vdpau/vdpau.h "defined VDP_DECODER_PROFILE_MPEG4_PART2_ASP" ||
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@ -22,7 +22,8 @@ OBJS-$(CONFIG_SNDIO_INDEV) += sndio_common.o sndio_dec.o
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OBJS-$(CONFIG_SNDIO_OUTDEV) += sndio_common.o sndio_enc.o
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OBJS-$(CONFIG_V4L2_INDEV) += v4l2.o
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OBJS-$(CONFIG_VFWCAP_INDEV) += vfwcap.o
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OBJS-$(CONFIG_X11GRAB_INDEV) += x11grab.o
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OBJS-$(CONFIG_X11GRAB_XLIB_INDEV) += x11grab.o
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OBJS-$(CONFIG_X11GRAB_XCB_INDEV) += xcbgrab.o
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# external libraries
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OBJS-$(CONFIG_LIBCDIO_INDEV) += libcdio.o
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@ -58,6 +58,7 @@ void avdevice_register_all(void)
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REGISTER_INDEV (V4L2, v4l2);
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REGISTER_INDEV (VFWCAP, vfwcap);
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REGISTER_INDEV (X11GRAB, x11grab);
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REGISTER_INDEV (X11GRAB_XCB, x11grab_xcb);
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/* external libraries */
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REGISTER_INDEV (LIBCDIO, libcdio);
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@ -28,7 +28,7 @@
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#include "libavutil/version.h"
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#define LIBAVDEVICE_VERSION_MAJOR 55
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#define LIBAVDEVICE_VERSION_MINOR 0
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#define LIBAVDEVICE_VERSION_MINOR 1
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#define LIBAVDEVICE_VERSION_MICRO 0
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#define LIBAVDEVICE_VERSION_INT AV_VERSION_INT(LIBAVDEVICE_VERSION_MAJOR, \
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655
libavdevice/xcbgrab.c
Normal file
655
libavdevice/xcbgrab.c
Normal file
@ -0,0 +1,655 @@
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/*
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* XCB input grabber
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* Copyright (C) 2014 Luca Barbato <lu_zero@gentoo.org>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav 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 GNU
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* 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 Libav; 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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#include "config.h"
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#include <stdlib.h>
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#include <xcb/xcb.h>
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#if CONFIG_LIBXCB_XFIXES
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#include <xcb/xfixes.h>
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#endif
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#if CONFIG_LIBXCB_SHM
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#include <sys/shm.h>
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#include <xcb/shm.h>
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#endif
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#include "libavformat/avformat.h"
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#include "libavformat/internal.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/opt.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/time.h"
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typedef struct XCBGrabContext {
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const AVClass *class;
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xcb_connection_t *conn;
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xcb_screen_t *screen;
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xcb_window_t window;
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xcb_shm_seg_t segment;
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int64_t time_frame;
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AVRational time_base;
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int x, y;
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int width, height;
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int frame_size;
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int bpp;
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int draw_mouse;
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int follow_mouse;
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int show_region;
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int region_border;
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int centered;
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const char *video_size;
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const char *framerate;
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int has_shm;
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} XCBGrabContext;
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#define FOLLOW_CENTER -1
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#define OFFSET(x) offsetof(XCBGrabContext, x)
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#define D AV_OPT_FLAG_DECODING_PARAM
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static const AVOption options[] = {
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{ "x", "Initial x coordinate.", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D },
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{ "y", "Initial y coordinate.", OFFSET(y), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D },
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{ "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = "vga" }, 0, 0, D },
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{ "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "ntsc" }, 0, 0, D },
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{ "draw_mouse", "Draw the mouse pointer.", OFFSET(draw_mouse), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, D },
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{ "follow_mouse", "Move the grabbing region when the mouse pointer reaches within specified amount of pixels to the edge of region.",
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OFFSET(follow_mouse), AV_OPT_TYPE_INT, { .i64 = 0 }, FOLLOW_CENTER, INT_MAX, D, "follow_mouse" },
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{ "centered", "Keep the mouse pointer at the center of grabbing region when following.", 0, AV_OPT_TYPE_CONST, { .i64 = -1 }, INT_MIN, INT_MAX, D, "follow_mouse" },
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{ "show_region", "Show the grabbing region.", OFFSET(show_region), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, D },
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{ "region_border", "Set the region border thickness.", OFFSET(region_border), AV_OPT_TYPE_INT, { .i64 = 3 }, 1, 128, D },
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{ NULL },
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};
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static const AVClass xcbgrab_class = {
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.class_name = "xcbgrab indev",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static int xcbgrab_reposition(AVFormatContext *s,
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xcb_query_pointer_reply_t *p,
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xcb_get_geometry_reply_t *geo)
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{
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XCBGrabContext *c = s->priv_data;
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int x = c->x, y = c->y, p_x = p->win_x, p_y = p->win_y;
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int w = c->width, h = c->height, f = c->follow_mouse;
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if (!p || !geo)
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return AVERROR(EIO);
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if (f == FOLLOW_CENTER) {
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x = p_x - w / 2;
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y = p_y - h / 2;
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} else {
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int left = x + f;
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int right = x + w - f;
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int top = y + f;
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int bottom = y + h + f;
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if (p_x > right) {
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x += p_x - right;
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} else if (p_x < left) {
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x -= left - p_x;
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}
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if (p_y > bottom) {
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y += p_y - bottom;
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} else if (p_y < top) {
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y -= top - p_y;
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}
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}
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c->x = FFMIN(FFMAX(0, x), geo->width - w);
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c->y = FFMIN(FFMAX(0, y), geo->height - h);
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return 0;
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}
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static int xcbgrab_frame(AVFormatContext *s, AVPacket *pkt)
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{
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XCBGrabContext *c = s->priv_data;
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xcb_get_image_cookie_t iq;
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xcb_get_image_reply_t *img;
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xcb_drawable_t drawable = c->screen->root;
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uint8_t *data;
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int length, ret;
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iq = xcb_get_image(c->conn, XCB_IMAGE_FORMAT_Z_PIXMAP, drawable,
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c->x, c->y, c->width, c->height, ~0);
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img = xcb_get_image_reply(c->conn, iq, NULL);
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if (!img)
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return AVERROR(EAGAIN);
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data = xcb_get_image_data(img);
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length = xcb_get_image_data_length(img);
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ret = av_new_packet(pkt, length);
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if (!ret)
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memcpy(pkt->data, data, length);
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free(img);
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return ret;
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}
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static void wait_frame(AVFormatContext *s, AVPacket *pkt)
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{
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XCBGrabContext *c = s->priv_data;
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int64_t curtime, delay;
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int64_t frame_time = av_rescale_q(1, c->time_base, AV_TIME_BASE_Q);
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c->time_frame += frame_time;
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for (;;) {
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curtime = av_gettime();
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delay = c->time_frame - curtime;
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if (delay <= 0)
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break;
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av_usleep(delay);
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}
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pkt->pts = curtime;
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}
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#if CONFIG_LIBXCB_SHM
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static int check_shm(xcb_connection_t *conn)
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{
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xcb_shm_query_version_cookie_t cookie = xcb_shm_query_version(conn);
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xcb_shm_query_version_reply_t *reply;
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reply = xcb_shm_query_version_reply(conn, cookie, NULL);
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if (reply) {
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free(reply);
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return 1;
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}
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return 0;
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}
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static void dealloc_shm(void *unused, uint8_t *data)
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{
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shmdt(data);
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}
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static int xcbgrab_frame_shm(AVFormatContext *s, AVPacket *pkt)
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{
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XCBGrabContext *c = s->priv_data;
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xcb_shm_get_image_cookie_t iq;
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xcb_shm_get_image_reply_t *img;
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xcb_drawable_t drawable = c->screen->root;
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uint8_t *data;
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int size = c->frame_size + FF_INPUT_BUFFER_PADDING_SIZE;
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int id = shmget(IPC_PRIVATE, size, IPC_CREAT | 0777);
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xcb_generic_error_t *e = NULL;
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if (id == -1) {
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char errbuf[1024];
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int err = AVERROR(errno);
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av_strerror(err, errbuf, sizeof(errbuf));
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av_log(s, AV_LOG_ERROR, "Cannot get %d bytes of shared memory: %s.\n",
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size, errbuf);
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return err;
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}
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xcb_shm_attach(c->conn, c->segment, id, 0);
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iq = xcb_shm_get_image(c->conn, drawable,
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c->x, c->y, c->width, c->height, ~0,
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XCB_IMAGE_FORMAT_Z_PIXMAP, c->segment, 0);
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xcb_shm_detach(c->conn, c->segment);
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img = xcb_shm_get_image_reply(c->conn, iq, &e);
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xcb_flush(c->conn);
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if (e) {
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av_log(s, AV_LOG_ERROR,
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"Cannot get the image data "
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"event_error: response_type:%u error_code:%u "
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"sequence:%u resource_id:%u minor_code:%u major_code:%u.\n",
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e->response_type, e->error_code,
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e->sequence, e->resource_id, e->minor_code, e->major_code);
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shmctl(id, IPC_RMID, 0);
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return AVERROR(EACCES);
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}
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free(img);
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data = shmat(id, NULL, 0);
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shmctl(id, IPC_RMID, 0);
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if ((intptr_t)data == -1)
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return AVERROR(errno);
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pkt->buf = av_buffer_create(data, size, dealloc_shm, NULL, 0);
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if (!pkt->buf) {
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shmdt(data);
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return AVERROR(ENOMEM);
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}
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pkt->data = pkt->buf->data;
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pkt->size = c->frame_size;
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return 0;
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}
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#endif /* CONFIG_LIBXCB_SHM */
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#if CONFIG_LIBXCB_XFIXES
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static int check_xfixes(xcb_connection_t *conn)
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{
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xcb_xfixes_query_version_cookie_t cookie;
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xcb_xfixes_query_version_reply_t *reply;
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cookie = xcb_xfixes_query_version(conn, XCB_XFIXES_MAJOR_VERSION,
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XCB_XFIXES_MINOR_VERSION);
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reply = xcb_xfixes_query_version_reply(conn, cookie, NULL);
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if (reply) {
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free(reply);
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return 1;
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}
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return 0;
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}
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#define BLEND(target, source, alpha) \
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(target) + ((source) * (255 - (alpha)) + 255 / 2) / 255
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static void xcbgrab_draw_mouse(AVFormatContext *s, AVPacket *pkt,
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xcb_query_pointer_reply_t *p,
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xcb_get_geometry_reply_t *geo)
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{
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XCBGrabContext *gr = s->priv_data;
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uint32_t *cursor;
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uint8_t *image = pkt->data;
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int stride = gr->bpp / 8;
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xcb_xfixes_get_cursor_image_cookie_t cc;
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xcb_xfixes_get_cursor_image_reply_t *ci;
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int cx, cy, x, y, w, h, c_off, i_off;
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cc = xcb_xfixes_get_cursor_image(gr->conn);
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ci = xcb_xfixes_get_cursor_image_reply(gr->conn, cc, NULL);
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if (!ci)
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return;
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cursor = xcb_xfixes_get_cursor_image_cursor_image(ci);
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if (!cursor)
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return;
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cx = ci->x - ci->xhot;
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cy = ci->y - ci->yhot;
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x = FFMAX(cx, gr->x);
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y = FFMAX(cy, gr->y);
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w = FFMIN(cx + ci->width, gr->x + gr->width) - x;
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h = FFMIN(cy + ci->height, gr->y + gr->height) - y;
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c_off = x - cx;
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i_off = x - gr->x;
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cursor += (y - cy) * ci->width;
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image += (y - gr->y) * gr->width * stride;
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||||
|
||||
for (y = 0; y < h; y++) {
|
||||
cursor += c_off;
|
||||
image += i_off * stride;
|
||||
for (x = 0; x < w; x++, cursor++, image += stride) {
|
||||
int r, g, b, a;
|
||||
|
||||
r = *cursor & 0xff;
|
||||
g = (*cursor >> 8) & 0xff;
|
||||
b = (*cursor >> 16) & 0xff;
|
||||
a = (*cursor >> 24) & 0xff;
|
||||
|
||||
if (!a)
|
||||
continue;
|
||||
|
||||
if (a == 255) {
|
||||
image[0] = r;
|
||||
image[1] = g;
|
||||
image[2] = b;
|
||||
} else {
|
||||
image[0] = BLEND(r, image[0], a);
|
||||
image[1] = BLEND(g, image[1], a);
|
||||
image[2] = BLEND(b, image[2], a);
|
||||
}
|
||||
|
||||
}
|
||||
cursor += ci->width - w - c_off;
|
||||
image += (gr->width - w - i_off) * stride;
|
||||
}
|
||||
|
||||
free(ci);
|
||||
}
|
||||
#endif /* CONFIG_LIBXCB_XFIXES */
|
||||
|
||||
static void xcbgrab_update_region(AVFormatContext *s)
|
||||
{
|
||||
XCBGrabContext *c = s->priv_data;
|
||||
const uint32_t args[] = { c->x - c->region_border,
|
||||
c->y - c->region_border };
|
||||
|
||||
xcb_configure_window(c->conn,
|
||||
c->window,
|
||||
XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y,
|
||||
args);
|
||||
}
|
||||
|
||||
static int xcbgrab_read_packet(AVFormatContext *s, AVPacket *pkt)
|
||||
{
|
||||
XCBGrabContext *c = s->priv_data;
|
||||
xcb_query_pointer_cookie_t pc;
|
||||
xcb_get_geometry_cookie_t gc;
|
||||
xcb_query_pointer_reply_t *p = NULL;
|
||||
xcb_get_geometry_reply_t *geo = NULL;
|
||||
int ret = 0;
|
||||
|
||||
wait_frame(s, pkt);
|
||||
|
||||
if (c->follow_mouse || c->draw_mouse) {
|
||||
pc = xcb_query_pointer(c->conn, c->screen->root);
|
||||
gc = xcb_get_geometry(c->conn, c->screen->root);
|
||||
p = xcb_query_pointer_reply(c->conn, pc, NULL);
|
||||
geo = xcb_get_geometry_reply(c->conn, gc, NULL);
|
||||
}
|
||||
|
||||
if (c->follow_mouse && p->same_screen)
|
||||
xcbgrab_reposition(s, p, geo);
|
||||
|
||||
if (c->show_region)
|
||||
xcbgrab_update_region(s);
|
||||
|
||||
#if CONFIG_LIBXCB_SHM
|
||||
if (c->has_shm && xcbgrab_frame_shm(s, pkt) < 0)
|
||||
c->has_shm = 0;
|
||||
#endif
|
||||
if (!c->has_shm)
|
||||
ret = xcbgrab_frame(s, pkt);
|
||||
|
||||
#if CONFIG_LIBXCB_XFIXES
|
||||
if (c->draw_mouse && p->same_screen)
|
||||
xcbgrab_draw_mouse(s, pkt, p, geo);
|
||||
#endif
|
||||
|
||||
free(p);
|
||||
free(geo);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static av_cold int xcbgrab_read_close(AVFormatContext *s)
|
||||
{
|
||||
XCBGrabContext *ctx = s->priv_data;
|
||||
|
||||
xcb_disconnect(ctx->conn);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static xcb_screen_t *get_screen(const xcb_setup_t *setup, int screen_num)
|
||||
{
|
||||
xcb_screen_iterator_t it = xcb_setup_roots_iterator(setup);
|
||||
xcb_screen_t *screen = NULL;
|
||||
|
||||
for (; it.rem > 0; xcb_screen_next (&it)) {
|
||||
if (!screen_num) {
|
||||
screen = it.data;
|
||||
break;
|
||||
}
|
||||
|
||||
screen_num--;
|
||||
}
|
||||
|
||||
return screen;
|
||||
}
|
||||
|
||||
static int pixfmt_from_pixmap_format(AVFormatContext *s, int depth,
|
||||
int *pix_fmt)
|
||||
{
|
||||
XCBGrabContext *c = s->priv_data;
|
||||
const xcb_setup_t *setup = xcb_get_setup(c->conn);
|
||||
const xcb_format_t *fmt = xcb_setup_pixmap_formats(setup);
|
||||
int length = xcb_setup_pixmap_formats_length(setup);
|
||||
|
||||
*pix_fmt = 0;
|
||||
|
||||
while (length--) {
|
||||
if (fmt->depth == depth) {
|
||||
switch (depth) {
|
||||
case 32:
|
||||
if (fmt->bits_per_pixel == 32)
|
||||
*pix_fmt = AV_PIX_FMT_ARGB;
|
||||
break;
|
||||
case 24:
|
||||
if (fmt->bits_per_pixel == 32)
|
||||
*pix_fmt = AV_PIX_FMT_RGB32;
|
||||
else if (fmt->bits_per_pixel == 24)
|
||||
*pix_fmt = AV_PIX_FMT_RGB24;
|
||||
break;
|
||||
case 16:
|
||||
if (fmt->bits_per_pixel == 16)
|
||||
*pix_fmt = AV_PIX_FMT_RGB565;
|
||||
break;
|
||||
case 15:
|
||||
if (fmt->bits_per_pixel == 16)
|
||||
*pix_fmt = AV_PIX_FMT_RGB555;
|
||||
break;
|
||||
case 8:
|
||||
if (fmt->bits_per_pixel == 8)
|
||||
*pix_fmt = AV_PIX_FMT_RGB8;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (*pix_fmt) {
|
||||
c->bpp = fmt->bits_per_pixel;
|
||||
c->frame_size = c->width * c->height * fmt->bits_per_pixel / 8;
|
||||
return 0;
|
||||
}
|
||||
|
||||
fmt++;
|
||||
}
|
||||
av_log(s, AV_LOG_ERROR, "Pixmap format not mappable.\n");
|
||||
|
||||
return AVERROR_PATCHWELCOME;
|
||||
}
|
||||
|
||||
static int create_stream(AVFormatContext *s)
|
||||
{
|
||||
XCBGrabContext *c = s->priv_data;
|
||||
AVStream *st = avformat_new_stream(s, NULL);
|
||||
const char *opts = strchr(s->filename, '+');
|
||||
xcb_get_geometry_cookie_t gc;
|
||||
xcb_get_geometry_reply_t *geo;
|
||||
int ret;
|
||||
|
||||
if (!st)
|
||||
return AVERROR(ENOMEM);
|
||||
|
||||
ret = av_parse_video_size(&c->width, &c->height, c->video_size);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = av_parse_video_rate(&st->avg_frame_rate, c->framerate);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
if (opts)
|
||||
sscanf(opts, "%d,%d", &c->x, &c->y);
|
||||
|
||||
avpriv_set_pts_info(st, 64, 1, 1000000);
|
||||
|
||||
gc = xcb_get_geometry(c->conn, c->screen->root);
|
||||
geo = xcb_get_geometry_reply(c->conn, gc, NULL);
|
||||
|
||||
c->width = FFMIN(geo->width, c->width);
|
||||
c->height = FFMIN(geo->height, c->height);
|
||||
c->time_base = (AVRational){ st->avg_frame_rate.den,
|
||||
st->avg_frame_rate.num };
|
||||
c->time_frame = av_gettime();
|
||||
|
||||
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
|
||||
st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
|
||||
st->codec->width = c->width;
|
||||
st->codec->height = c->height;
|
||||
st->codec->time_base = c->time_base;
|
||||
|
||||
ret = pixfmt_from_pixmap_format(s, geo->depth, &st->codec->pix_fmt);
|
||||
|
||||
free(geo);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void draw_rectangle(AVFormatContext *s)
|
||||
{
|
||||
XCBGrabContext *c = s->priv_data;
|
||||
xcb_gcontext_t gc = xcb_generate_id(c->conn);
|
||||
uint32_t mask = XCB_GC_FOREGROUND |
|
||||
XCB_GC_BACKGROUND |
|
||||
XCB_GC_LINE_WIDTH |
|
||||
XCB_GC_LINE_STYLE |
|
||||
XCB_GC_FILL_STYLE;
|
||||
uint32_t values[] = { c->screen->black_pixel,
|
||||
c->screen->white_pixel,
|
||||
c->region_border,
|
||||
XCB_LINE_STYLE_DOUBLE_DASH,
|
||||
XCB_FILL_STYLE_SOLID };
|
||||
xcb_rectangle_t r = { 1, 1,
|
||||
c->width + c->region_border * 2 - 3,
|
||||
c->height + c->region_border * 2 - 3 };
|
||||
|
||||
xcb_create_gc(c->conn, gc, c->window, mask, values);
|
||||
|
||||
xcb_poly_rectangle(c->conn, c->window, gc, 1, &r);
|
||||
}
|
||||
|
||||
static void setup_window(AVFormatContext *s)
|
||||
{
|
||||
XCBGrabContext *c = s->priv_data;
|
||||
uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
|
||||
uint32_t values[] = { 1,
|
||||
XCB_EVENT_MASK_EXPOSURE |
|
||||
XCB_EVENT_MASK_STRUCTURE_NOTIFY };
|
||||
xcb_rectangle_t rect = { c->x, c->y, c->width, c->height };
|
||||
|
||||
c->window = xcb_generate_id(c->conn);
|
||||
|
||||
xcb_create_window(c->conn, XCB_COPY_FROM_PARENT,
|
||||
c->window,
|
||||
c->screen->root,
|
||||
c->x - c->region_border,
|
||||
c->y - c->region_border,
|
||||
c->width + c->region_border * 2,
|
||||
c->height + c->region_border * 2,
|
||||
0,
|
||||
XCB_WINDOW_CLASS_INPUT_OUTPUT,
|
||||
XCB_COPY_FROM_PARENT,
|
||||
mask, values);
|
||||
|
||||
xcb_shape_rectangles(c->conn, XCB_SHAPE_SO_SUBTRACT,
|
||||
XCB_SHAPE_SK_BOUNDING, XCB_CLIP_ORDERING_UNSORTED,
|
||||
c->window,
|
||||
c->region_border, c->region_border,
|
||||
1, &rect);
|
||||
|
||||
xcb_map_window(c->conn, c->window);
|
||||
|
||||
draw_rectangle(s);
|
||||
}
|
||||
|
||||
static av_cold int xcbgrab_read_header(AVFormatContext *s)
|
||||
{
|
||||
XCBGrabContext *c = s->priv_data;
|
||||
int screen_num, ret;
|
||||
const xcb_setup_t *setup;
|
||||
|
||||
c->conn = xcb_connect(s->filename, &screen_num);
|
||||
if ((ret = xcb_connection_has_error(c->conn))) {
|
||||
av_log(s, AV_LOG_ERROR, "Cannot open display %s, error %d.\n",
|
||||
s->filename ? s->filename : "default", ret);
|
||||
return AVERROR(EIO);
|
||||
}
|
||||
setup = xcb_get_setup(c->conn);
|
||||
|
||||
c->screen = get_screen(setup, screen_num);
|
||||
if (!c->screen) {
|
||||
av_log(s, AV_LOG_ERROR, "The screen %d does not exist.\n",
|
||||
screen_num);
|
||||
xcbgrab_read_close(s);
|
||||
return AVERROR(EIO);
|
||||
}
|
||||
|
||||
c->segment = xcb_generate_id(c->conn);
|
||||
|
||||
ret = create_stream(s);
|
||||
|
||||
if (ret < 0) {
|
||||
xcbgrab_read_close(s);
|
||||
return ret;
|
||||
}
|
||||
|
||||
#if CONFIG_LIBXCB_SHM
|
||||
c->has_shm = check_shm(c->conn);
|
||||
#endif
|
||||
|
||||
#if CONFIG_LIBXCB_XFIXES
|
||||
if (c->draw_mouse) {
|
||||
if (!(c->draw_mouse = check_xfixes(c->conn))) {
|
||||
av_log(s, AV_LOG_WARNING,
|
||||
"XFixes not available, cannot draw the mouse.\n");
|
||||
}
|
||||
if (c->bpp < 24) {
|
||||
avpriv_report_missing_feature(s, "%d bits per pixel screen",
|
||||
c->bpp);
|
||||
c->draw_mouse = 0;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
if (c->show_region)
|
||||
setup_window(s);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
AVInputFormat ff_x11grab_xcb_demuxer = {
|
||||
.name = "x11grab",
|
||||
.long_name = NULL_IF_CONFIG_SMALL("X11 screen capture, using XCB"),
|
||||
.priv_data_size = sizeof(XCBGrabContext),
|
||||
.read_header = xcbgrab_read_header,
|
||||
.read_packet = xcbgrab_read_packet,
|
||||
.read_close = xcbgrab_read_close,
|
||||
.flags = AVFMT_NOFILE,
|
||||
.priv_class = &xcbgrab_class,
|
||||
};
|
||||
Loading…
Reference in New Issue
Block a user