@@ -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:

@@ -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

@@ -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

@@ -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

@@ -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 */

@@ -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.

deleted file mode 100644

@@ -1,647 +0,0 @@

-/*

- * X11 video grab interface

- *

- * This file is part of Libav.

- *

- * Libav integration:

- * Copyright (C) 2006 Clemens Fruhwirth <clemens@endorphin.org>

- *                    Edouard Gomez <ed.gomez@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@endorphin.org>

- * @author Edouard Gomez <ed.gomez@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,

-};