@@ -5,6 +5,7 @@ version <next>:

 - aliases and defaults for Ogg subtypes (opus, spx)

 - HEVC/H.265 RTP payload format (draft v6) packetizer and depacketizer

 - avplay now exits by default at the end of playback

+- XCB-based screen-grabber

 version 11:

@@ -210,10 +210,13 @@ External library support:

   --enable-libx264         enable H.264 encoding via x264 [no]

   --enable-libx265         enable HEVC encoding via x265 [no]

   --enable-libxavs         enable AVS encoding via xavs [no]

+  --enable-libxcb          enable X11 grabbing using XCB [no]

+  --enable-libxcb-shm      enable X11 grabbing shm communication [auto]

+  --enable-libxcb-xfixes   enable X11 grabbing mouse rendering [auto]

   --enable-libxvid         enable Xvid encoding via xvidcore,

                            native MPEG-4/Xvid encoder exists [no]

   --enable-openssl         enable openssl [no]

-  --enable-x11grab         enable X11 grabbing [no]

+  --enable-x11grab         enable X11 grabbing (legacy) [no]

   --enable-zlib            enable zlib [autodetect]

 Toolchain options:

@@ -1170,6 +1173,9 @@ EXTERNAL_LIBRARY_LIST="

     libx264

     libx265

     libxavs

+    libxcb

+    libxcb_shm

+    libxcb_xfixes

     libxvid

     openssl

     x11grab

@@ -2102,7 +2108,8 @@ 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 XShmCreateImage"

+x11grab_indev_deps="x11grab"

+x11grab_xcb_indev_deps="libxcb"

 # protocols

 ffrtmpcrypt_protocol_deps="!librtmp_protocol"

@@ -4273,10 +4280,30 @@ fi

 check_lib X11/Xlib.h XOpenDisplay -lX11 && enable xlib

-enabled x11grab                                           &&

-require Xext X11/extensions/XShm.h XShmCreateImage -lXext &&

-require Xfixes X11/extensions/Xfixes.h XFixesGetCursorImage -lXfixes &&

-{ enabled xlib || die "ERROR: Xlib not found"; }

+if enabled libxcb || enabled x11grab && ! disabled libxcb; then

+    check_pkg_config xcb-event xcb/xcb.h xcb_connect || {

+        enabled libxcb && die "ERROR: libxcb not found";

+    } && disable x11grab && enable libxcb

+

+    disabled libxcb_shm ||

+        check_pkg_config xcb-shm xcb/shm.h xcb_shm_attach || {

+            enabled libxcb_shm && die "ERROR: libxcb_shm not found";

+        } && check_header sys/shm.h && enable libxcb_shm

+

+    disabled libxcb_xfixes ||

+        check_pkg_config xcb-xfixes xcb/xfixes.h xcb_xfixes_get_cursor_image || {

+            enabled libxcb_xfixes && die "ERROR: libxcb_xfixes not found";

+        } && enable libxcb_xfixes

+

+    add_cflags "$xcb_event_cflags $xcb_shm_cflags $xcb_xfixes_cflags"

+    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 vdpau &&

     check_cpp_condition vdpau/vdpau.h "defined VDP_DECODER_PROFILE_MPEG4_PART2_ASP" ||

@@ -22,7 +22,8 @@ OBJS-$(CONFIG_SNDIO_INDEV)               += sndio_common.o sndio_dec.o

 OBJS-$(CONFIG_SNDIO_OUTDEV)              += sndio_common.o sndio_enc.o

 OBJS-$(CONFIG_V4L2_INDEV)                += v4l2.o

 OBJS-$(CONFIG_VFWCAP_INDEV)              += vfwcap.o

-OBJS-$(CONFIG_X11GRAB_INDEV)             += x11grab.o

+OBJS-$(CONFIG_X11GRAB_XLIB_INDEV)        += x11grab.o

+OBJS-$(CONFIG_X11GRAB_XCB_INDEV)         += xcbgrab.o

 # external libraries

 OBJS-$(CONFIG_LIBCDIO_INDEV)             += libcdio.o

@@ -58,6 +58,7 @@ void avdevice_register_all(void)

     REGISTER_INDEV   (V4L2,             v4l2);

     REGISTER_INDEV   (VFWCAP,           vfwcap);

     REGISTER_INDEV   (X11GRAB,          x11grab);

+    REGISTER_INDEV   (X11GRAB_XCB,      x11grab_xcb);

     /* external libraries */

     REGISTER_INDEV   (LIBCDIO,          libcdio);

@@ -28,7 +28,7 @@

 #include "libavutil/version.h"

 #define LIBAVDEVICE_VERSION_MAJOR 55

-#define LIBAVDEVICE_VERSION_MINOR  0

+#define LIBAVDEVICE_VERSION_MINOR  1

 #define LIBAVDEVICE_VERSION_MICRO  0

 #define LIBAVDEVICE_VERSION_INT AV_VERSION_INT(LIBAVDEVICE_VERSION_MAJOR, \

new file mode 100644

@@ -0,0 +1,655 @@

+/*

+ * XCB input grabber

+ * Copyright (C) 2014 Luca Barbato <lu_zero@gentoo.org>

+ *

+ * This file is part of Libav.

+ *

+ * Libav is free software; you can redistribute it and/or

+ * modify it under the terms of the GNU Lesser General Public

+ * License as published by the Free Software Foundation; either

+ * version 2.1 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

+ * Lesser General Public License for more details.

+ *

+ * You should have received a copy of the GNU Lesser 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

+ */

+

+#include "config.h"

+

+#include <stdlib.h>

+#include <xcb/xcb.h>

+

+#if CONFIG_LIBXCB_XFIXES

+#include <xcb/xfixes.h>

+#endif

+

+#if CONFIG_LIBXCB_SHM

+#include <sys/shm.h>

+#include <xcb/shm.h>

+#endif

+

+#include "libavformat/avformat.h"

+#include "libavformat/internal.h"

+

+#include "libavutil/mathematics.h"

+#include "libavutil/opt.h"

+#include "libavutil/parseutils.h"

+#include "libavutil/time.h"

+

+typedef struct XCBGrabContext {

+    const AVClass *class;

+

+    xcb_connection_t *conn;

+    xcb_screen_t *screen;

+    xcb_window_t window;

+    xcb_shm_seg_t segment;

+

+    int64_t time_frame;

+    AVRational time_base;

+

+    int x, y;

+    int width, height;

+    int frame_size;

+    int bpp;

+

+    int draw_mouse;

+    int follow_mouse;

+    int show_region;

+    int region_border;

+    int centered;

+

+    const char *video_size;

+    const char *framerate;

+

+    int has_shm;

+} XCBGrabContext;

+

+#define FOLLOW_CENTER -1

+

+#define OFFSET(x) offsetof(XCBGrabContext, x)

+#define D AV_OPT_FLAG_DECODING_PARAM

+static const AVOption options[] = {

+    { "x", "Initial x coordinate.", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D },

+    { "y", "Initial y coordinate.", OFFSET(y), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D },

+    { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = "vga" }, 0, 0, D },

+    { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "ntsc" }, 0, 0, D },

+    { "draw_mouse", "Draw the mouse pointer.", OFFSET(draw_mouse), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, D },

+    { "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 },  FOLLOW_CENTER, INT_MAX, D, "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, D, "follow_mouse" },

+    { "show_region", "Show the grabbing region.", OFFSET(show_region), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, D },

+    { "region_border", "Set the region border thickness.", OFFSET(region_border), AV_OPT_TYPE_INT, { .i64 = 3 }, 1, 128, D },

+    { NULL },

+};

+

+static const AVClass xcbgrab_class = {

+    .class_name = "xcbgrab indev",

+    .item_name  = av_default_item_name,

+    .option     = options,

+    .version    = LIBAVUTIL_VERSION_INT,

+};

+

+static int xcbgrab_reposition(AVFormatContext *s,

+                              xcb_query_pointer_reply_t *p,

+                              xcb_get_geometry_reply_t *geo)

+{

+    XCBGrabContext *c = s->priv_data;

+    int x = c->x, y = c->y, p_x = p->win_x, p_y = p->win_y;

+    int w = c->width, h = c->height, f = c->follow_mouse;

+

+    if (!p || !geo)

+        return AVERROR(EIO);

+

+    if (f == FOLLOW_CENTER) {

+        x = p_x - w / 2;

+        y = p_y - h / 2;

+    } else {

+        int left   = x + f;

+        int right  = x + w - f;

+        int top    = y + f;

+        int bottom = y + h + f;

+        if (p_x > right) {

+            x += p_x - right;

+        } else if (p_x < left) {

+            x -= left - p_x;

+        }

+        if (p_y > bottom) {

+            y += p_y - bottom;

+        } else if (p_y < top) {

+            y -= top - p_y;

+        }

+    }

+

+    c->x = FFMIN(FFMAX(0, x), geo->width  - w);

+    c->y = FFMIN(FFMAX(0, y), geo->height - h);

+

+    return 0;

+}

+

+static int xcbgrab_frame(AVFormatContext *s, AVPacket *pkt)

+{

+    XCBGrabContext *c = s->priv_data;

+    xcb_get_image_cookie_t iq;

+    xcb_get_image_reply_t *img;

+    xcb_drawable_t drawable = c->screen->root;

+    uint8_t *data;

+    int length, ret;

+

+    iq  = xcb_get_image(c->conn, XCB_IMAGE_FORMAT_Z_PIXMAP, drawable,

+                        c->x, c->y, c->width, c->height, ~0);

+

+    img = xcb_get_image_reply(c->conn, iq, NULL);

+    if (!img)

+        return AVERROR(EAGAIN);

+

+    data   = xcb_get_image_data(img);

+    length = xcb_get_image_data_length(img);

+

+    ret = av_new_packet(pkt, length);

+

+    if (!ret)

+        memcpy(pkt->data, data, length);

+

+    free(img);

+

+    return ret;

+}

+

+static void wait_frame(AVFormatContext *s, AVPacket *pkt)

+{

+    XCBGrabContext *c = s->priv_data;

+    int64_t curtime, delay;

+    int64_t frame_time = av_rescale_q(1, c->time_base, AV_TIME_BASE_Q);

+

+    c->time_frame += frame_time;

+

+    for (;;) {

+        curtime = av_gettime();

+        delay   = c->time_frame - curtime;

+        if (delay <= 0)

+            break;

+        av_usleep(delay);

+    }

+

+    pkt->pts = curtime;

+}

+

+#if CONFIG_LIBXCB_SHM

+static int check_shm(xcb_connection_t *conn)

+{

+    xcb_shm_query_version_cookie_t cookie = xcb_shm_query_version(conn);

+    xcb_shm_query_version_reply_t *reply;

+

+    reply = xcb_shm_query_version_reply(conn, cookie, NULL);

+    if (reply) {

+        free(reply);

+        return 1;

+    }

+

+    return 0;

+}

+

+static void dealloc_shm(void *unused, uint8_t *data)

+{

+    shmdt(data);

+}

+

+static int xcbgrab_frame_shm(AVFormatContext *s, AVPacket *pkt)

+{

+    XCBGrabContext *c = s->priv_data;

+    xcb_shm_get_image_cookie_t iq;

+    xcb_shm_get_image_reply_t *img;

+    xcb_drawable_t drawable = c->screen->root;

+    uint8_t *data;

+    int size = c->frame_size + FF_INPUT_BUFFER_PADDING_SIZE;

+    int id   = shmget(IPC_PRIVATE, size, IPC_CREAT | 0777);

+    xcb_generic_error_t *e = NULL;

+

+    if (id == -1) {

+        char errbuf[1024];

+        int err = AVERROR(errno);

+        av_strerror(err, errbuf, sizeof(errbuf));

+        av_log(s, AV_LOG_ERROR, "Cannot get %d bytes of shared memory: %s.\n",

+               size, errbuf);

+        return err;

+    }

+

+    xcb_shm_attach(c->conn, c->segment, id, 0);

+

+    iq = xcb_shm_get_image(c->conn, drawable,

+                           c->x, c->y, c->width, c->height, ~0,

+                           XCB_IMAGE_FORMAT_Z_PIXMAP, c->segment, 0);

+

+    xcb_shm_detach(c->conn, c->segment);

+

+    img = xcb_shm_get_image_reply(c->conn, iq, &e);

+

+    xcb_flush(c->conn);

+

+    if (e) {

+        av_log(s, AV_LOG_ERROR,

+               "Cannot get the image data "

+               "event_error: response_type:%u error_code:%u "

+               "sequence:%u resource_id:%u minor_code:%u major_code:%u.\n",

+               e->response_type, e->error_code,

+               e->sequence, e->resource_id, e->minor_code, e->major_code);

+

+        shmctl(id, IPC_RMID, 0);

+        return AVERROR(EACCES);

+    }

+

+    free(img);

+

+    data = shmat(id, NULL, 0);

+    shmctl(id, IPC_RMID, 0);

+

+    if ((intptr_t)data == -1)

+        return AVERROR(errno);

+

+    pkt->buf = av_buffer_create(data, size, dealloc_shm, NULL, 0);

+    if (!pkt->buf) {

+        shmdt(data);

+        return AVERROR(ENOMEM);

+    }

+

+    pkt->data = pkt->buf->data;

+    pkt->size = c->frame_size;

+

+    return 0;

+}

+#endif /* CONFIG_LIBXCB_SHM */

+

+#if CONFIG_LIBXCB_XFIXES

+static int check_xfixes(xcb_connection_t *conn)

+{

+    xcb_xfixes_query_version_cookie_t cookie;

+    xcb_xfixes_query_version_reply_t *reply;

+

+    cookie = xcb_xfixes_query_version(conn, XCB_XFIXES_MAJOR_VERSION,

+                                      XCB_XFIXES_MINOR_VERSION);

+    reply  = xcb_xfixes_query_version_reply(conn, cookie, NULL);

+

+    if (reply) {

+        free(reply);

+        return 1;

+    }

+    return 0;

+}

+

+#define BLEND(target, source, alpha) \

+    (target) + ((source) * (255 - (alpha)) + 255 / 2) / 255

+

+static void xcbgrab_draw_mouse(AVFormatContext *s, AVPacket *pkt,

+                               xcb_query_pointer_reply_t *p,

+                               xcb_get_geometry_reply_t *geo)

+{

+    XCBGrabContext *gr = s->priv_data;

+    uint32_t *cursor;

+    uint8_t *image = pkt->data;

+    int stride     = gr->bpp / 8;

+    xcb_xfixes_get_cursor_image_cookie_t cc;

+    xcb_xfixes_get_cursor_image_reply_t *ci;

+    int cx, cy, x, y, w, h, c_off, i_off;

+

+    cc = xcb_xfixes_get_cursor_image(gr->conn);

+    ci = xcb_xfixes_get_cursor_image_reply(gr->conn, cc, NULL);

+    if (!ci)

+        return;

+

+    cursor = xcb_xfixes_get_cursor_image_cursor_image(ci);

+    if (!cursor)

+        return;

+

+    cx = ci->x - ci->xhot;

+    cy = ci->y - ci->yhot;

+

+    x = FFMAX(cx, gr->x);

+    y = FFMAX(cy, gr->y);

+

+    w = FFMIN(cx + ci->width,  gr->x + gr->width)  - x;

+    h = FFMIN(cy + ci->height, gr->y + gr->height) - y;

+

+    c_off = x - cx;

+    i_off = x - gr->x;

+

+    cursor += (y - cy) * ci->width;

+    image  += (y - gr->y) * gr->width * stride;

+

+    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,

+};