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Commit a6674d2e authored by Luca Barbato's avatar Luca Barbato
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xcbgrab: XCB-based screen capture 

Matches the x11grab screen capture by features.
parent ed6dad37
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Showing with 693 additions and 8 deletions
Changelog
View file @ a6674d2e
...@@ -5,6 +5,7 @@ version <next>: ...@@ -5,6 +5,7 @@ version <next>:
- aliases and defaults for Ogg subtypes (opus, spx) - aliases and defaults for Ogg subtypes (opus, spx)
- HEVC/H.265 RTP payload format (draft v6) packetizer and depacketizer - HEVC/H.265 RTP payload format (draft v6) packetizer and depacketizer
- avplay now exits by default at the end of playback - avplay now exits by default at the end of playback
- XCB-based screen-grabber
version 11: version 11:
......
configure
View file @ a6674d2e
...@@ -210,10 +210,13 @@ External library support: ...@@ -210,10 +210,13 @@ External library support:
--enable-libx264 enable H.264 encoding via x264 [no] --enable-libx264 enable H.264 encoding via x264 [no]
--enable-libx265 enable HEVC encoding via x265 [no] --enable-libx265 enable HEVC encoding via x265 [no]
--enable-libxavs enable AVS encoding via xavs [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, --enable-libxvid enable Xvid encoding via xvidcore,
native MPEG-4/Xvid encoder exists [no] native MPEG-4/Xvid encoder exists [no]
--enable-openssl enable openssl [no] --enable-openssl enable openssl [no]
--enable-x11grab enable X11 grabbing [no] --enable-x11grab enable X11 grabbing (legacy) [no]
--enable-zlib enable zlib [autodetect] --enable-zlib enable zlib [autodetect]
Toolchain options: Toolchain options:
...@@ -1170,6 +1173,9 @@ EXTERNAL_LIBRARY_LIST=" ...@@ -1170,6 +1173,9 @@ EXTERNAL_LIBRARY_LIST="
libx264 libx264
libx265 libx265
libxavs libxavs
libxcb
libxcb_shm
libxcb_xfixes
libxvid libxvid
openssl openssl
x11grab x11grab
...@@ -2102,7 +2108,8 @@ sndio_outdev_deps="sndio_h" ...@@ -2102,7 +2108,8 @@ sndio_outdev_deps="sndio_h"
v4l2_indev_deps_any="linux_videodev2_h sys_videoio_h" v4l2_indev_deps_any="linux_videodev2_h sys_videoio_h"
vfwcap_indev_deps="capCreateCaptureWindow vfwcap_defines" vfwcap_indev_deps="capCreateCaptureWindow vfwcap_defines"
vfwcap_indev_extralibs="-lavicap32" vfwcap_indev_extralibs="-lavicap32"
x11grab_indev_deps="x11grab XShmCreateImage" x11grab_indev_deps="x11grab"
x11grab_xcb_indev_deps="libxcb"
# protocols # protocols
ffrtmpcrypt_protocol_deps="!librtmp_protocol" ffrtmpcrypt_protocol_deps="!librtmp_protocol"
...@@ -4273,10 +4280,30 @@ fi ...@@ -4273,10 +4280,30 @@ fi
check_lib X11/Xlib.h XOpenDisplay -lX11 && enable xlib check_lib X11/Xlib.h XOpenDisplay -lX11 && enable xlib
enabled x11grab && if enabled libxcb || enabled x11grab && ! disabled libxcb; then
require Xext X11/extensions/XShm.h XShmCreateImage -lXext && check_pkg_config xcb-event xcb/xcb.h xcb_connect || {
require Xfixes X11/extensions/Xfixes.h XFixesGetCursorImage -lXfixes && enabled libxcb && die "ERROR: libxcb not found";
{ enabled xlib || die "ERROR: Xlib 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 $xcb_xfixes_libs"
fi
if enabled x11grab; then
enabled xlib || die "ERROR: Xlib not found"
require Xext X11/extensions/XShm.h XShmCreateImage -lXext
require Xfixes X11/extensions/Xfixes.h XFixesGetCursorImage -lXfixes
fi
enabled vdpau && enabled vdpau &&
check_cpp_condition vdpau/vdpau.h "defined VDP_DECODER_PROFILE_MPEG4_PART2_ASP" || check_cpp_condition vdpau/vdpau.h "defined VDP_DECODER_PROFILE_MPEG4_PART2_ASP" ||
......
libavdevice/Makefile
View file @ a6674d2e
...@@ -22,7 +22,8 @@ OBJS-$(CONFIG_SNDIO_INDEV) += sndio_common.o sndio_dec.o ...@@ -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-$(CONFIG_SNDIO_OUTDEV) += sndio_common.o sndio_enc.o
OBJS-$(CONFIG_V4L2_INDEV) += v4l2.o OBJS-$(CONFIG_V4L2_INDEV) += v4l2.o
OBJS-$(CONFIG_VFWCAP_INDEV) += vfwcap.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 # external libraries
OBJS-$(CONFIG_LIBCDIO_INDEV) += libcdio.o OBJS-$(CONFIG_LIBCDIO_INDEV) += libcdio.o
......
libavdevice/alldevices.c
View file @ a6674d2e
...@@ -58,6 +58,7 @@ void avdevice_register_all(void) ...@@ -58,6 +58,7 @@ void avdevice_register_all(void)
REGISTER_INDEV (V4L2, v4l2); REGISTER_INDEV (V4L2, v4l2);
REGISTER_INDEV (VFWCAP, vfwcap); REGISTER_INDEV (VFWCAP, vfwcap);
REGISTER_INDEV (X11GRAB, x11grab); REGISTER_INDEV (X11GRAB, x11grab);
REGISTER_INDEV (X11GRAB_XCB, x11grab_xcb);
/* external libraries */ /* external libraries */
REGISTER_INDEV (LIBCDIO, libcdio); REGISTER_INDEV (LIBCDIO, libcdio);
......
libavdevice/version.h
View file @ a6674d2e
...@@ -28,7 +28,7 @@ ...@@ -28,7 +28,7 @@
#include "libavutil/version.h" #include "libavutil/version.h"
#define LIBAVDEVICE_VERSION_MAJOR 55 #define LIBAVDEVICE_VERSION_MAJOR 55
#define LIBAVDEVICE_VERSION_MINOR 0 #define LIBAVDEVICE_VERSION_MINOR 1
#define LIBAVDEVICE_VERSION_MICRO 0 #define LIBAVDEVICE_VERSION_MICRO 0
#define LIBAVDEVICE_VERSION_INT AV_VERSION_INT(LIBAVDEVICE_VERSION_MAJOR, \ #define LIBAVDEVICE_VERSION_INT AV_VERSION_INT(LIBAVDEVICE_VERSION_MAJOR, \
......
libavdevice/xcbgrab.c 0 → 100644
View file @ a6674d2e
/*
* 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,
};
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