[FFmpeg-cvslog] Remove the legacy X11 screen grabber
Diego Biurrun
git at videolan.org
Wed Mar 15 23:14:42 EET 2017
ffmpeg | branch: master | Diego Biurrun <diego at biurrun.de> | Wed Jul 27 11:25:19 2016 +0200| [4fef648d10bf3bcfd4b8fa5755c1128966a2427c] | committer: Diego Biurrun
Remove the legacy X11 screen grabber
The XCB screen grabber is a drop-in replacement and not under GPL.
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4fef648d10bf3bcfd4b8fa5755c1128966a2427c
---
Changelog | 1 +
LICENSE | 1 -
configure | 13 +-
libavdevice/Makefile | 1 -
libavdevice/alldevices.c | 1 -
libavdevice/avdevice.h | 2 +-
libavdevice/x11grab.c | 647 -----------------------------------------------
7 files changed, 4 insertions(+), 662 deletions(-)
diff --git a/Changelog b/Changelog
index d3201b3..0d04f47 100644
--- a/Changelog
+++ b/Changelog
@@ -61,6 +61,7 @@ version <next>:
- Duck TrueMotion 2.0 Real Time decoder
- Intel QSV video scaling and deinterlacing filter
- OpenH264 decoder wrapper
+- Removed the legacy X11 screen grabber, use XCB instead
version 11:
diff --git a/LICENSE b/LICENSE
index 1eae4e7..a2de35c 100644
--- a/LICENSE
+++ b/LICENSE
@@ -13,7 +13,6 @@ configure to activate them. In this case, Libav's license changes to GPL v2+.
Specifically, the GPL parts of Libav are
-- the X11 grabber in libavdevice/x11grab.c
- the texi2pod.pl tool
- the following filters in libavfilter:
- vf_blackframe.c
diff --git a/configure b/configure
index e366dad..45f5256 100755
--- a/configure
+++ b/configure
@@ -227,7 +227,6 @@ External library support:
--enable-libxcb-xfixes X11 mouse rendering [auto]
--enable-libxvid MPEG-4 ASP video encoding
--enable-openssl crypto
- --enable-x11grab X11 grabbing through xlib (legacy, use xcb instead)
--enable-zlib compression [autodetect]
The following libraries provide various hardware acceleration features:
@@ -1242,7 +1241,6 @@ EXTERNAL_LIBRARY_GPL_LIST="
libx265
libxavs
libxvid
- x11grab
"
EXTERNAL_LIBRARY_NONFREE_LIST="
@@ -2369,7 +2367,6 @@ sndio_outdev_deps="sndio_h"
v4l2_indev_deps_any="linux_videodev2_h sys_videoio_h"
vfwcap_indev_deps="capCreateCaptureWindow vfwcap_defines"
vfwcap_indev_extralibs="-lavicap32"
-x11grab_indev_deps="x11grab"
x11grab_xcb_indev_deps="libxcb"
# protocols
@@ -4752,10 +4749,10 @@ fi
check_lib X11/Xlib.h XOpenDisplay -lX11 && enable xlib
-if enabled libxcb || enabled x11grab && ! disabled libxcb; then
+if enabled libxcb; then
check_pkg_config xcb-shape xcb/shape.h xcb_shape_rectangles || {
enabled libxcb && die "ERROR: libxcb not found";
- } && disable x11grab && enable libxcb
+ } && enable libxcb
disabled libxcb_shm ||
check_pkg_config xcb-shm xcb/shm.h xcb_shm_attach || {
@@ -4771,12 +4768,6 @@ if enabled libxcb || enabled x11grab && ! disabled libxcb; then
add_extralibs "$xcb_event_libs $xcb_shm_libs $xcb_xfixes_libs"
fi
-if enabled x11grab; then
- enabled xlib || die "ERROR: Xlib not found"
- require Xext X11/extensions/XShm.h XShmCreateImage -lXext
- require Xfixes X11/extensions/Xfixes.h XFixesGetCursorImage -lXfixes
-fi
-
enabled vaapi &&
check_code cc "va/va.h" "vaCreateSurfaces(0, 0, 0, 0, 0, 0, 0, 0)" ||
disable vaapi
diff --git a/libavdevice/Makefile b/libavdevice/Makefile
index b3b53da..a4c96ef 100644
--- a/libavdevice/Makefile
+++ b/libavdevice/Makefile
@@ -23,7 +23,6 @@ OBJS-$(CONFIG_SNDIO_INDEV) += sndio_dec.o sndio.o
OBJS-$(CONFIG_SNDIO_OUTDEV) += sndio_enc.o sndio.o
OBJS-$(CONFIG_V4L2_INDEV) += v4l2.o
OBJS-$(CONFIG_VFWCAP_INDEV) += vfwcap.o
-OBJS-$(CONFIG_X11GRAB_INDEV) += x11grab.o
OBJS-$(CONFIG_X11GRAB_XCB_INDEV) += xcbgrab.o
# external libraries
diff --git a/libavdevice/alldevices.c b/libavdevice/alldevices.c
index 8439b5b..8541dba 100644
--- a/libavdevice/alldevices.c
+++ b/libavdevice/alldevices.c
@@ -58,7 +58,6 @@ void avdevice_register_all(void)
REGISTER_INOUTDEV(SNDIO, sndio);
REGISTER_INDEV (V4L2, v4l2);
REGISTER_INDEV (VFWCAP, vfwcap);
- REGISTER_INDEV (X11GRAB, x11grab);
REGISTER_INDEV (X11GRAB_XCB, x11grab_xcb);
/* external libraries */
diff --git a/libavdevice/avdevice.h b/libavdevice/avdevice.h
index 39166a5..824ac52 100644
--- a/libavdevice/avdevice.h
+++ b/libavdevice/avdevice.h
@@ -36,7 +36,7 @@
* (de)muxers in libavdevice are of the AVFMT_NOFILE type (they use their own
* I/O functions). The filename passed to avformat_open_input() often does not
* refer to an actually existing file, but has some special device-specific
- * meaning - e.g. for x11grab it is the display name.
+ * meaning - e.g. for x11grab_xcb it is the display name.
*
* To use libavdevice, simply call avdevice_register_all() to register all
* compiled muxers and demuxers. They all use standard libavformat API.
diff --git a/libavdevice/x11grab.c b/libavdevice/x11grab.c
deleted file mode 100644
index 60e2560..0000000
--- a/libavdevice/x11grab.c
+++ /dev/null
@@ -1,647 +0,0 @@
-/*
- * X11 video grab interface
- *
- * This file is part of Libav.
- *
- * Libav integration:
- * Copyright (C) 2006 Clemens Fruhwirth <clemens at endorphin.org>
- * Edouard Gomez <ed.gomez at free.fr>
- *
- * This file contains code from grab.c:
- * Copyright (c) 2000-2001 Fabrice Bellard
- *
- * This file contains code from the xvidcap project:
- * Copyright (C) 1997-1998 Rasca, Berlin
- * 2003-2004 Karl H. Beckers, Frankfurt
- *
- * Libav is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * Libav is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Libav; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/**
- * @file
- * X11 frame device demuxer
- * @author Clemens Fruhwirth <clemens at endorphin.org>
- * @author Edouard Gomez <ed.gomez at free.fr>
- */
-
-#include "config.h"
-
-#include <time.h>
-#include <sys/shm.h>
-
-#include <X11/X.h>
-#include <X11/Xlib.h>
-#include <X11/Xlibint.h>
-#include <X11/Xproto.h>
-#include <X11/Xutil.h>
-
-#include <X11/extensions/shape.h>
-#include <X11/extensions/Xfixes.h>
-#include <X11/extensions/XShm.h>
-
-#include "libavutil/internal.h"
-#include "libavutil/log.h"
-#include "libavutil/opt.h"
-#include "libavutil/parseutils.h"
-#include "libavutil/time.h"
-
-#include "libavformat/avformat.h"
-#include "libavformat/internal.h"
-
-/** X11 device demuxer context */
-typedef struct X11GrabContext {
- const AVClass *class; /**< Class for private options. */
- int frame_size; /**< Size in bytes of a grabbed frame */
- AVRational time_base; /**< Time base */
- int64_t time_frame; /**< Current time */
-
- char *video_size; /**< String describing video size, set by a private option. */
- int height; /**< Height of the grab frame */
- int width; /**< Width of the grab frame */
- int x_off; /**< Horizontal top-left corner coordinate */
- int y_off; /**< Vertical top-left corner coordinate */
-
- Display *dpy; /**< X11 display from which x11grab grabs frames */
- XImage *image; /**< X11 image holding the grab */
- int use_shm; /**< !0 when using XShm extension */
- XShmSegmentInfo shminfo; /**< When using XShm, keeps track of XShm info */
- int draw_mouse; /**< Set by a private option. */
- int follow_mouse; /**< Set by a private option. */
- int show_region; /**< set by a private option. */
- char *framerate; /**< Set by a private option. */
-
- Window region_win; /**< This is used by show_region option. */
-} X11GrabContext;
-
-#define REGION_WIN_BORDER 3
-
-/**
- * Draw grabbing region window
- *
- * @param s x11grab context
- */
-static void x11grab_draw_region_win(X11GrabContext *s)
-{
- Display *dpy = s->dpy;
- Window win = s->region_win;
- int screen = DefaultScreen(dpy);
- GC gc = XCreateGC(dpy, win, 0, 0);
-
- XSetForeground(dpy, gc, WhitePixel(dpy, screen));
- XSetBackground(dpy, gc, BlackPixel(dpy, screen));
- XSetLineAttributes(dpy, gc, REGION_WIN_BORDER, 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 x11grab context
- */
-static void x11grab_region_win_init(X11GrabContext *s)
-{
- Display *dpy = s->dpy;
- XRectangle rect;
- XSetWindowAttributes attribs = { .override_redirect = True };
- int screen = DefaultScreen(dpy);
-
- 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);
-}
-
-static int setup_shm(AVFormatContext *s, Display *dpy, XImage **image)
-{
- X11GrabContext *g = s->priv_data;
- int scr = XDefaultScreen(dpy);
- XImage *img = XShmCreateImage(dpy, DefaultVisual(dpy, scr),
- DefaultDepth(dpy, scr), ZPixmap, NULL,
- &g->shminfo, g->width, g->height);
-
- g->shminfo.shmid = shmget(IPC_PRIVATE, img->bytes_per_line * img->height,
- IPC_CREAT | 0777);
-
- if (g->shminfo.shmid == -1) {
- av_log(s, AV_LOG_ERROR, "Cannot get shared memory!\n");
- return AVERROR(ENOMEM);
- }
-
- g->shminfo.shmaddr = img->data = shmat(g->shminfo.shmid, 0, 0);
- g->shminfo.readOnly = False;
-
- if (!XShmAttach(dpy, &g->shminfo)) {
- av_log(s, AV_LOG_ERROR, "Failed to attach shared memory!\n");
- /* needs some better error subroutine :) */
- return AVERROR(EIO);
- }
-
- *image = img;
- return 0;
-}
-
-static int setup_mouse(Display *dpy, int screen)
-{
- int ev_ret, ev_err;
-
- if (XFixesQueryExtension(dpy, &ev_ret, &ev_err)) {
- Window root = RootWindow(dpy, screen);
- XFixesSelectCursorInput(dpy, root, XFixesDisplayCursorNotifyMask);
- return 0;
- }
-
- return AVERROR(ENOSYS);
-}
-
-static int pixfmt_from_image(AVFormatContext *s, XImage *image, int *pix_fmt)
-{
- av_log(s, AV_LOG_DEBUG,
- "Image r 0x%.6lx g 0x%.6lx b 0x%.6lx and depth %i\n",
- image->red_mask,
- image->green_mask,
- image->blue_mask,
- image->bits_per_pixel);
-
- switch (image->bits_per_pixel) {
- case 8:
- *pix_fmt = AV_PIX_FMT_PAL8;
- break;
- case 16:
- if (image->red_mask == 0xf800 &&
- image->green_mask == 0x07e0 &&
- image->blue_mask == 0x001f) {
- *pix_fmt = AV_PIX_FMT_RGB565;
- } else if (image->red_mask == 0x7c00 &&
- image->green_mask == 0x03e0 &&
- image->blue_mask == 0x001f) {
- *pix_fmt = AV_PIX_FMT_RGB555;
- }
- break;
- case 24:
- if (image->red_mask == 0xff0000 &&
- image->green_mask == 0x00ff00 &&
- image->blue_mask == 0x0000ff) {
- *pix_fmt = AV_PIX_FMT_BGR24;
- } else if (image->red_mask == 0x0000ff &&
- image->green_mask == 0x00ff00 &&
- image->blue_mask == 0xff0000) {
- *pix_fmt = AV_PIX_FMT_RGB24;
- }
- break;
- case 32:
- *pix_fmt = AV_PIX_FMT_RGB32;
- break;
- default:
- av_log(s, AV_LOG_ERROR,
- "XImages with RGB mask 0x%.6lx 0x%.6lx 0x%.6lx and depth %i "
- "are currently not supported.\n",
- image->red_mask,
- image->green_mask,
- image->blue_mask,
- image->bits_per_pixel);
-
- return AVERROR_PATCHWELCOME;
- }
-
- return 0;
-}
-
-/**
- * Initialize the x11 grab device demuxer (public device demuxer API).
- *
- * @param s1 Context from avformat core
- * @return <ul>
- * <li>AVERROR(ENOMEM) no memory left</li>
- * <li>AVERROR(EIO) other failure case</li>
- * <li>0 success</li>
- * </ul>
- */
-static int x11grab_read_header(AVFormatContext *s1)
-{
- X11GrabContext *x11grab = s1->priv_data;
- Display *dpy;
- AVStream *st = NULL;
- XImage *image;
- int x_off = 0, y_off = 0, ret = 0, screen, use_shm;
- char *param, *offset;
- AVRational framerate;
-
- param = av_strdup(s1->filename);
- if (!param)
- goto out;
-
- offset = strchr(param, '+');
- if (offset) {
- sscanf(offset, "%d,%d", &x_off, &y_off);
- x11grab->draw_mouse = !strstr(offset, "nomouse");
- *offset = 0;
- }
-
- ret = av_parse_video_size(&x11grab->width, &x11grab->height,
- x11grab->video_size);
- if (ret < 0) {
- av_log(s1, AV_LOG_ERROR, "Couldn't parse video size.\n");
- goto out;
- }
-
- ret = av_parse_video_rate(&framerate, x11grab->framerate);
- if (ret < 0) {
- av_log(s1, AV_LOG_ERROR, "Could not parse framerate: %s.\n",
- x11grab->framerate);
- goto out;
- }
- av_log(s1, AV_LOG_INFO,
- "device: %s -> display: %s x: %d y: %d width: %d height: %d\n",
- s1->filename, param, x_off, y_off, x11grab->width, x11grab->height);
-
- dpy = XOpenDisplay(param);
- if (!dpy) {
- av_log(s1, AV_LOG_ERROR, "Could not open X display.\n");
- ret = AVERROR(EIO);
- goto out;
- }
-
- st = avformat_new_stream(s1, NULL);
- if (!st) {
- ret = AVERROR(ENOMEM);
- goto out;
- }
- avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
-
- screen = DefaultScreen(dpy);
-
- if (x11grab->follow_mouse) {
- int screen_w, screen_h;
- Window w;
-
- screen_w = DisplayWidth(dpy, screen);
- screen_h = DisplayHeight(dpy, screen);
- XQueryPointer(dpy, RootWindow(dpy, screen), &w, &w, &x_off, &y_off,
- &ret, &ret, &ret);
- x_off -= x11grab->width / 2;
- y_off -= x11grab->height / 2;
- 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 %sfound\n", use_shm ? "" : "not ");
-
- if (use_shm && setup_shm(s1, dpy, &image) < 0) {
- av_log(s1, AV_LOG_WARNING, "Falling back to XGetImage\n");
- use_shm = 0;
- }
-
- if (!use_shm) {
- image = XGetImage(dpy, RootWindow(dpy, screen),
- x_off, y_off,
- x11grab->width, x11grab->height,
- AllPlanes, ZPixmap);
- }
-
- if (x11grab->draw_mouse && setup_mouse(dpy, screen) < 0) {
- av_log(s1, AV_LOG_WARNING,
- "XFixes not available, cannot draw the mouse cursor\n");
- x11grab->draw_mouse = 0;
- }
-
- x11grab->frame_size = x11grab->width * x11grab->height * image->bits_per_pixel / 8;
- x11grab->dpy = dpy;
- x11grab->time_base = (AVRational) { framerate.den, framerate.num };
- x11grab->time_frame = av_gettime() / av_q2d(x11grab->time_base);
- x11grab->x_off = x_off;
- x11grab->y_off = y_off;
- x11grab->image = image;
- x11grab->use_shm = use_shm;
-
- ret = pixfmt_from_image(s1, image, &st->codecpar->format);
- if (ret < 0)
- goto out;
-
- st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
- st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
- st->codecpar->width = x11grab->width;
- st->codecpar->height = x11grab->height;
- st->codecpar->bit_rate = x11grab->frame_size * 1 / av_q2d(x11grab->time_base) * 8;
-
- st->avg_frame_rate = av_inv_q(x11grab->time_base);
-
-out:
- av_free(param);
- return ret;
-}
-
-/**
- * Paint a mouse pointer in an X11 image.
- *
- * @param image image to paint the mouse pointer to
- * @param s context used to retrieve original grabbing rectangle
- * coordinates
- */
-static void paint_mouse_pointer(XImage *image, X11GrabContext *s)
-{
- int x_off = s->x_off;
- int y_off = s->y_off;
- int width = s->width;
- int height = s->height;
- Display *dpy = s->dpy;
- XFixesCursorImage *xcim;
- int x, y;
- int line, column;
- int to_line, to_column;
- int pixstride = image->bits_per_pixel >> 3;
- /* Warning: in its insanity, xlib provides unsigned image data through a
- * char* pointer, so we have to make it uint8_t to make things not break.
- * Anyone who performs further investigation of the xlib API likely risks
- * permanent brain damage. */
- uint8_t *pix = image->data;
-
- /* Code doesn't currently support 16-bit or PAL8 */
- if (image->bits_per_pixel != 24 && image->bits_per_pixel != 32)
- return;
-
- xcim = XFixesGetCursorImage(dpy);
- if (!xcim)
- return;
-
- x = xcim->x - xcim->xhot;
- y = xcim->y - xcim->yhot;
-
- to_line = FFMIN((y + xcim->height), (height + y_off));
- to_column = FFMIN((x + xcim->width), (width + x_off));
-
- for (line = FFMAX(y, y_off); line < to_line; line++) {
- for (column = FFMAX(x, x_off); column < to_column; column++) {
- int xcim_addr = (line - y) * xcim->width + column - x;
- int image_addr = ((line - y_off) * width + column - x_off) * pixstride;
- int r = (uint8_t)(xcim->pixels[xcim_addr] >> 0);
- int g = (uint8_t)(xcim->pixels[xcim_addr] >> 8);
- int b = (uint8_t)(xcim->pixels[xcim_addr] >> 16);
- int a = (uint8_t)(xcim->pixels[xcim_addr] >> 24);
-
- if (a == 255) {
- pix[image_addr + 0] = r;
- pix[image_addr + 1] = g;
- pix[image_addr + 2] = b;
- } else if (a) {
- /* pixel values from XFixesGetCursorImage come premultiplied by alpha */
- pix[image_addr + 0] = r + (pix[image_addr + 0] * (255 - a) + 255 / 2) / 255;
- pix[image_addr + 1] = g + (pix[image_addr + 1] * (255 - a) + 255 / 2) / 255;
- pix[image_addr + 2] = b + (pix[image_addr + 2] * (255 - a) + 255 / 2) / 255;
- }
- }
- }
-
- XFree(xcim);
- xcim = NULL;
-}
-
-/**
- * Read new data in the image structure.
- *
- * @param dpy X11 display to grab from
- * @param d
- * @param image Image where the grab will be put
- * @param x Top-Left grabbing rectangle horizontal coordinate
- * @param y Top-Left grabbing rectangle vertical coordinate
- * @return 0 if error, !0 if successful
- */
-static int xget_zpixmap(Display *dpy, Drawable d, XImage *image, int x, int y)
-{
- xGetImageReply rep;
- xGetImageReq *req;
- long nbytes;
-
- if (!image)
- return 0;
-
- LockDisplay(dpy);
- GetReq(GetImage, req);
-
- /* First set up the standard stuff in the request */
- req->drawable = d;
- req->x = x;
- req->y = y;
- req->width = image->width;
- req->height = image->height;
- req->planeMask = (unsigned int)AllPlanes;
- req->format = ZPixmap;
-
- if (!_XReply(dpy, (xReply *)&rep, 0, xFalse) || !rep.length) {
- UnlockDisplay(dpy);
- SyncHandle();
- return 0;
- }
-
- nbytes = (long)rep.length << 2;
- _XReadPad(dpy, image->data, nbytes);
-
- UnlockDisplay(dpy);
- SyncHandle();
- return 1;
-}
-
-/**
- * Grab a frame from x11 (public device demuxer API).
- *
- * @param s1 Context from avformat core
- * @param pkt Packet holding the brabbed frame
- * @return frame size in bytes
- */
-static int x11grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
-{
- X11GrabContext *s = s1->priv_data;
- Display *dpy = s->dpy;
- XImage *image = s->image;
- int x_off = s->x_off;
- int y_off = s->y_off;
- int follow_mouse = s->follow_mouse;
- int screen, pointer_x, pointer_y, _, same_screen = 1;
- Window w, root;
- int64_t curtime, delay;
- struct timespec ts;
-
- /* Calculate the time of the next frame */
- s->time_frame += INT64_C(1000000);
-
- /* wait based on the frame rate */
- for (;;) {
- curtime = av_gettime();
- delay = s->time_frame * av_q2d(s->time_base) - curtime;
- if (delay <= 0) {
- if (delay < INT64_C(-1000000) * av_q2d(s->time_base))
- s->time_frame += INT64_C(1000000);
- break;
- }
- ts.tv_sec = delay / 1000000;
- ts.tv_nsec = (delay % 1000000) * 1000;
- nanosleep(&ts, NULL);
- }
-
- pkt->data = image->data;
- pkt->size = s->frame_size;
- pkt->pts = curtime;
-
- screen = DefaultScreen(dpy);
- root = RootWindow(dpy, screen);
-
- if (follow_mouse || s->draw_mouse)
- same_screen = XQueryPointer(dpy, root, &w, &w,
- &pointer_x, &pointer_y, &_, &_, &_);
-
- if (follow_mouse && same_screen) {
- int screen_w, screen_h;
-
- screen_w = DisplayWidth(dpy, screen);
- screen_h = DisplayHeight(dpy, screen);
- if (follow_mouse == -1) {
- // follow the mouse, put it at center of grabbing region
- x_off += pointer_x - s->width / 2 - x_off;
- y_off += pointer_y - s->height / 2 - y_off;
- } else {
- // follow the mouse, but only move the grabbing region when mouse
- // reaches within certain pixels to the edge.
- if (pointer_x > x_off + s->width - follow_mouse)
- x_off += pointer_x - (x_off + s->width - follow_mouse);
- else if (pointer_x < x_off + follow_mouse)
- x_off -= (x_off + follow_mouse) - pointer_x;
- if (pointer_y > y_off + s->height - follow_mouse)
- y_off += pointer_y - (y_off + s->height - follow_mouse);
- else if (pointer_y < y_off + follow_mouse)
- y_off -= (y_off + follow_mouse) - pointer_y;
- }
- // 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 && same_screen) {
- if (s->region_win) {
- XEvent evt = { .type = NoEventMask };
- // Clean up the events, and do the initial draw or redraw.
- while (XCheckMaskEvent(dpy, ExposureMask | StructureNotifyMask,
- &evt))
- ;
- if (evt.type)
- x11grab_draw_region_win(s);
- } else {
- x11grab_region_win_init(s);
- }
- }
-
- if (s->use_shm) {
- if (!XShmGetImage(dpy, root, image, x_off, y_off, AllPlanes))
- av_log(s1, AV_LOG_INFO, "XShmGetImage() failed\n");
- } else {
- if (!xget_zpixmap(dpy, root, image, x_off, y_off))
- av_log(s1, AV_LOG_INFO, "XGetZPixmap() failed\n");
- }
-
- if (s->draw_mouse && same_screen)
- paint_mouse_pointer(image, s);
-
- return s->frame_size;
-}
-
-/**
- * Close x11 frame grabber (public device demuxer API).
- *
- * @param s1 Context from avformat core
- * @return 0 success, !0 failure
- */
-static int x11grab_read_close(AVFormatContext *s1)
-{
- X11GrabContext *x11grab = s1->priv_data;
-
- /* Detach cleanly from shared mem */
- if (x11grab->use_shm) {
- XShmDetach(x11grab->dpy, &x11grab->shminfo);
- shmdt(x11grab->shminfo.shmaddr);
- shmctl(x11grab->shminfo.shmid, IPC_RMID, NULL);
- }
-
- /* Destroy X11 image */
- if (x11grab->image) {
- XDestroyImage(x11grab->image);
- x11grab->image = NULL;
- }
-
- if (x11grab->region_win)
- XDestroyWindow(x11grab->dpy, x11grab->region_win);
-
- /* Free X11 display */
- XCloseDisplay(x11grab->dpy);
- return 0;
-}
-
-#define OFFSET(x) offsetof(X11GrabContext, x)
-#define DEC AV_OPT_FLAG_DECODING_PARAM
-static const AVOption options[] = {
- { "grab_x", "Initial x coordinate.", OFFSET(x_off), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, DEC },
- { "grab_y", "Initial y coordinate.", OFFSET(y_off), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, DEC },
- { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = "vga"}, 0, 0, DEC },
- { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "ntsc"}, 0, 0, DEC },
- { "draw_mouse", "Draw the mouse pointer.", OFFSET(draw_mouse), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, DEC },
- { "follow_mouse", "Move the grabbing region when the mouse pointer reaches within specified amount of pixels to the edge of region.",
- OFFSET(follow_mouse), AV_OPT_TYPE_INT, { .i64 = 0 }, -1, INT_MAX, DEC, "follow_mouse" },
- { "centered", "Keep the mouse pointer at the center of grabbing region when following.", 0, AV_OPT_TYPE_CONST, { .i64 = -1 }, INT_MIN, INT_MAX, DEC, "follow_mouse" },
- { "show_region", "Show the grabbing region.", OFFSET(show_region), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, DEC },
- { NULL },
-};
-
-static const AVClass x11_class = {
- .class_name = "X11grab indev",
- .item_name = av_default_item_name,
- .option = options,
- .version = LIBAVUTIL_VERSION_INT,
-};
-
-/** x11 grabber device demuxer declaration */
-AVInputFormat ff_x11grab_demuxer = {
- .name = "x11grab",
- .long_name = NULL_IF_CONFIG_SMALL("X11grab"),
- .priv_data_size = sizeof(X11GrabContext),
- .read_header = x11grab_read_header,
- .read_packet = x11grab_read_packet,
- .read_close = x11grab_read_close,
- .flags = AVFMT_NOFILE,
- .priv_class = &x11_class,
-};
More information about the ffmpeg-cvslog
mailing list