3 * Copyright (C) 2014 Luca Barbato <lu_zero@gentoo.org>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 #if CONFIG_LIBXCB_XFIXES
29 #include <xcb/xfixes.h>
37 #if CONFIG_LIBXCB_SHAPE
38 #include <xcb/shape.h>
41 #include "libavutil/internal.h"
42 #include "libavutil/mathematics.h"
43 #include "libavutil/opt.h"
44 #include "libavutil/parseutils.h"
45 #include "libavutil/time.h"
47 #include "libavformat/avformat.h"
48 #include "libavformat/internal.h"
50 typedef struct XCBGrabContext {
53 xcb_connection_t *conn;
57 AVBufferPool *shm_pool;
61 int64_t frame_duration;
63 xcb_window_t window_id;
76 const char *framerate;
81 #define FOLLOW_CENTER -1
83 #define OFFSET(x) offsetof(XCBGrabContext, x)
84 #define D AV_OPT_FLAG_DECODING_PARAM
85 static const AVOption options[] = {
86 { "window_id", "Window to capture.", OFFSET(window_id), AV_OPT_TYPE_INT, { .i64 = XCB_NONE }, 0, UINT32_MAX, D },
87 { "x", "Initial x coordinate.", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D },
88 { "y", "Initial y coordinate.", OFFSET(y), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D },
89 { "grab_x", "Initial x coordinate.", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D },
90 { "grab_y", "Initial y coordinate.", OFFSET(y), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D },
91 { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL }, 0, 0, D },
92 { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "ntsc" }, 0, 0, D },
93 { "draw_mouse", "Draw the mouse pointer.", OFFSET(draw_mouse), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, D },
94 { "follow_mouse", "Move the grabbing region when the mouse pointer reaches within specified amount of pixels to the edge of region.",
95 OFFSET(follow_mouse), AV_OPT_TYPE_INT, { .i64 = 0 }, FOLLOW_CENTER, INT_MAX, D, "follow_mouse" },
96 { "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" },
97 { "show_region", "Show the grabbing region.", OFFSET(show_region), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, D },
98 { "region_border", "Set the region border thickness.", OFFSET(region_border), AV_OPT_TYPE_INT, { .i64 = 3 }, 1, 128, D },
99 { "select_region", "Select the grabbing region graphically using the pointer.", OFFSET(select_region), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, D },
103 static const AVClass xcbgrab_class = {
104 .class_name = "xcbgrab indev",
105 .item_name = av_default_item_name,
107 .version = LIBAVUTIL_VERSION_INT,
108 .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
111 static int xcbgrab_reposition(AVFormatContext *s,
112 xcb_query_pointer_reply_t *p,
113 xcb_get_geometry_reply_t *geo)
115 XCBGrabContext *c = s->priv_data;
116 int x = c->x, y = c->y;
117 int w = c->width, h = c->height, f = c->follow_mouse;
126 if (f == FOLLOW_CENTER) {
131 int right = x + w - f;
133 int bottom = y + h - f;
136 } else if (p_x < left) {
141 } else if (p_y < top) {
146 c->x = FFMIN(FFMAX(0, x), geo->width - w);
147 c->y = FFMIN(FFMAX(0, y), geo->height - h);
152 static void xcbgrab_image_reply_free(void *opaque, uint8_t *data)
157 static int xcbgrab_frame(AVFormatContext *s, AVPacket *pkt)
159 XCBGrabContext *c = s->priv_data;
160 xcb_get_image_cookie_t iq;
161 xcb_get_image_reply_t *img;
162 xcb_drawable_t drawable = c->window_id;
163 xcb_generic_error_t *e = NULL;
167 iq = xcb_get_image(c->conn, XCB_IMAGE_FORMAT_Z_PIXMAP, drawable,
168 c->x, c->y, c->width, c->height, ~0);
170 img = xcb_get_image_reply(c->conn, iq, &e);
173 av_log(s, AV_LOG_ERROR,
174 "Cannot get the image data "
175 "event_error: response_type:%u error_code:%u "
176 "sequence:%u resource_id:%u minor_code:%u major_code:%u.\n",
177 e->response_type, e->error_code,
178 e->sequence, e->resource_id, e->minor_code, e->major_code);
180 return AVERROR(EACCES);
184 return AVERROR(EAGAIN);
186 data = xcb_get_image_data(img);
187 length = xcb_get_image_data_length(img);
191 pkt->buf = av_buffer_create(data, length, xcbgrab_image_reply_free, img, 0);
194 return AVERROR(ENOMEM);
203 static int64_t wait_frame(AVFormatContext *s, AVPacket *pkt)
205 XCBGrabContext *c = s->priv_data;
206 int64_t curtime, delay;
208 c->time_frame += c->frame_duration;
211 curtime = av_gettime_relative();
212 delay = c->time_frame - curtime;
221 #if CONFIG_LIBXCB_SHM
222 static int check_shm(xcb_connection_t *conn)
224 xcb_shm_query_version_cookie_t cookie = xcb_shm_query_version(conn);
225 xcb_shm_query_version_reply_t *reply;
227 reply = xcb_shm_query_version_reply(conn, cookie, NULL);
236 static void free_shm_buffer(void *opaque, uint8_t *data)
241 static AVBufferRef *allocate_shm_buffer(void *opaque, buffer_size_t size)
243 xcb_connection_t *conn = opaque;
244 xcb_shm_seg_t segment;
249 id = shmget(IPC_PRIVATE, size, IPC_CREAT | 0777);
253 segment = xcb_generate_id(conn);
254 xcb_shm_attach(conn, segment, id, 0);
255 data = shmat(id, NULL, 0);
256 shmctl(id, IPC_RMID, 0);
257 if ((intptr_t)data == -1 || !data)
260 ref = av_buffer_create(data, size, free_shm_buffer, (void *)(ptrdiff_t)segment, 0);
267 static int xcbgrab_frame_shm(AVFormatContext *s, AVPacket *pkt)
269 XCBGrabContext *c = s->priv_data;
270 xcb_shm_get_image_cookie_t iq;
271 xcb_shm_get_image_reply_t *img;
272 xcb_drawable_t drawable = c->window_id;
273 xcb_generic_error_t *e = NULL;
275 xcb_shm_seg_t segment;
277 buf = av_buffer_pool_get(c->shm_pool);
279 av_log(s, AV_LOG_ERROR, "Could not get shared memory buffer.\n");
280 return AVERROR(ENOMEM);
282 segment = (xcb_shm_seg_t)av_buffer_pool_buffer_get_opaque(buf);
284 iq = xcb_shm_get_image(c->conn, drawable,
285 c->x, c->y, c->width, c->height, ~0,
286 XCB_IMAGE_FORMAT_Z_PIXMAP, segment, 0);
287 img = xcb_shm_get_image_reply(c->conn, iq, &e);
292 av_log(s, AV_LOG_ERROR,
293 "Cannot get the image data "
294 "event_error: response_type:%u error_code:%u "
295 "sequence:%u resource_id:%u minor_code:%u major_code:%u.\n",
296 e->response_type, e->error_code,
297 e->sequence, e->resource_id, e->minor_code, e->major_code);
300 av_buffer_unref(&buf);
301 return AVERROR(EACCES);
309 pkt->data = buf->data;
310 pkt->size = c->frame_size;
314 #endif /* CONFIG_LIBXCB_SHM */
316 #if CONFIG_LIBXCB_XFIXES
317 static int check_xfixes(xcb_connection_t *conn)
319 xcb_xfixes_query_version_cookie_t cookie;
320 xcb_xfixes_query_version_reply_t *reply;
322 cookie = xcb_xfixes_query_version(conn, XCB_XFIXES_MAJOR_VERSION,
323 XCB_XFIXES_MINOR_VERSION);
324 reply = xcb_xfixes_query_version_reply(conn, cookie, NULL);
333 #define BLEND(target, source, alpha) \
334 (target) + ((source) * (255 - (alpha)) + 255 / 2) / 255
336 static void xcbgrab_draw_mouse(AVFormatContext *s, AVPacket *pkt,
337 xcb_query_pointer_reply_t *p,
338 xcb_get_geometry_reply_t *geo,
339 int win_x, int win_y)
341 XCBGrabContext *gr = s->priv_data;
343 uint8_t *image = pkt->data;
344 int stride = gr->bpp / 8;
345 xcb_xfixes_get_cursor_image_cookie_t cc;
346 xcb_xfixes_get_cursor_image_reply_t *ci;
347 int cx, cy, x, y, w, h, c_off, i_off;
349 cc = xcb_xfixes_get_cursor_image(gr->conn);
350 ci = xcb_xfixes_get_cursor_image_reply(gr->conn, cc, NULL);
354 cursor = xcb_xfixes_get_cursor_image_cursor_image(ci);
358 cx = ci->x - ci->xhot;
359 cy = ci->y - ci->yhot;
361 x = FFMAX(cx, win_x + gr->x);
362 y = FFMAX(cy, win_y + gr->y);
364 w = FFMIN(cx + ci->width, win_x + gr->x + gr->width) - x;
365 h = FFMIN(cy + ci->height, win_y + gr->y + gr->height) - y;
368 i_off = x - gr->x - win_x;
370 cursor += (y - cy) * ci->width;
371 image += (y - gr->y - win_y) * gr->width * stride;
373 for (y = 0; y < h; y++) {
375 image += i_off * stride;
376 for (x = 0; x < w; x++, cursor++, image += stride) {
380 g = (*cursor >> 8) & 0xff;
381 b = (*cursor >> 16) & 0xff;
382 a = (*cursor >> 24) & 0xff;
392 image[0] = BLEND(r, image[0], a);
393 image[1] = BLEND(g, image[1], a);
394 image[2] = BLEND(b, image[2], a);
398 cursor += ci->width - w - c_off;
399 image += (gr->width - w - i_off) * stride;
404 #endif /* CONFIG_LIBXCB_XFIXES */
406 static void xcbgrab_update_region(AVFormatContext *s, int win_x, int win_y)
408 XCBGrabContext *c = s->priv_data;
409 const uint32_t args[] = { win_x + c->x - c->region_border,
410 win_y + c->y - c->region_border };
412 xcb_configure_window(c->conn,
414 XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y,
418 static int xcbgrab_read_packet(AVFormatContext *s, AVPacket *pkt)
420 XCBGrabContext *c = s->priv_data;
421 xcb_query_pointer_cookie_t pc;
422 xcb_get_geometry_cookie_t gc;
423 xcb_translate_coordinates_cookie_t tc;
424 xcb_query_pointer_reply_t *p = NULL;
425 xcb_get_geometry_reply_t *geo = NULL;
426 xcb_translate_coordinates_reply_t *translate = NULL;
429 int win_x = 0, win_y = 0;
434 if (c->follow_mouse || c->draw_mouse) {
435 pc = xcb_query_pointer(c->conn, c->window_id);
436 gc = xcb_get_geometry(c->conn, c->window_id);
437 p = xcb_query_pointer_reply(c->conn, pc, NULL);
439 av_log(s, AV_LOG_ERROR, "Failed to query xcb pointer\n");
440 return AVERROR_EXTERNAL;
442 geo = xcb_get_geometry_reply(c->conn, gc, NULL);
444 av_log(s, AV_LOG_ERROR, "Failed to get xcb geometry\n");
446 return AVERROR_EXTERNAL;
449 if (c->window_id != c->screen->root) {
450 tc = xcb_translate_coordinates(c->conn, c->window_id, c->screen->root, 0, 0);
451 translate = xcb_translate_coordinates_reply(c->conn, tc, NULL);
455 av_log(s, AV_LOG_ERROR, "Failed to translate xcb geometry\n");
456 return AVERROR_EXTERNAL;
458 win_x = translate->dst_x;
459 win_y = translate->dst_y;
463 if (c->follow_mouse && p->same_screen)
464 xcbgrab_reposition(s, p, geo);
467 xcbgrab_update_region(s, win_x, win_y);
469 #if CONFIG_LIBXCB_SHM
470 if (c->has_shm && xcbgrab_frame_shm(s, pkt) < 0) {
471 av_log(s, AV_LOG_WARNING, "Continuing without shared memory.\n");
476 ret = xcbgrab_frame(s, pkt);
477 pkt->dts = pkt->pts = pts;
478 pkt->duration = c->frame_duration;
480 #if CONFIG_LIBXCB_XFIXES
481 if (ret >= 0 && c->draw_mouse && p->same_screen)
482 xcbgrab_draw_mouse(s, pkt, p, geo, win_x, win_y);
491 static av_cold int xcbgrab_read_close(AVFormatContext *s)
493 XCBGrabContext *ctx = s->priv_data;
495 #if CONFIG_LIBXCB_SHM
496 av_buffer_pool_uninit(&ctx->shm_pool);
499 xcb_disconnect(ctx->conn);
504 static xcb_screen_t *get_screen(const xcb_setup_t *setup, int screen_num)
506 xcb_screen_iterator_t it = xcb_setup_roots_iterator(setup);
507 xcb_screen_t *screen = NULL;
509 for (; it.rem > 0; xcb_screen_next (&it)) {
521 static int pixfmt_from_pixmap_format(AVFormatContext *s, int depth,
522 int *pix_fmt, int *bpp)
524 XCBGrabContext *c = s->priv_data;
525 const xcb_setup_t *setup = xcb_get_setup(c->conn);
526 const xcb_format_t *fmt = xcb_setup_pixmap_formats(setup);
527 int length = xcb_setup_pixmap_formats_length(setup);
532 if (fmt->depth == depth) {
535 if (fmt->bits_per_pixel == 32)
536 *pix_fmt = setup->image_byte_order == XCB_IMAGE_ORDER_LSB_FIRST ?
537 AV_PIX_FMT_BGR0 : AV_PIX_FMT_0RGB;
540 if (fmt->bits_per_pixel == 32)
541 *pix_fmt = setup->image_byte_order == XCB_IMAGE_ORDER_LSB_FIRST ?
542 AV_PIX_FMT_BGR0 : AV_PIX_FMT_0RGB;
543 else if (fmt->bits_per_pixel == 24)
544 *pix_fmt = setup->image_byte_order == XCB_IMAGE_ORDER_LSB_FIRST ?
545 AV_PIX_FMT_BGR24 : AV_PIX_FMT_RGB24;
548 if (fmt->bits_per_pixel == 16)
549 *pix_fmt = setup->image_byte_order == XCB_IMAGE_ORDER_LSB_FIRST ?
550 AV_PIX_FMT_RGB565LE : AV_PIX_FMT_RGB565BE;
553 if (fmt->bits_per_pixel == 16)
554 *pix_fmt = setup->image_byte_order == XCB_IMAGE_ORDER_LSB_FIRST ?
555 AV_PIX_FMT_RGB555LE : AV_PIX_FMT_RGB555BE;
558 if (fmt->bits_per_pixel == 8)
559 *pix_fmt = AV_PIX_FMT_RGB8;
565 *bpp = fmt->bits_per_pixel;
571 avpriv_report_missing_feature(s, "Mapping this pixmap format");
573 return AVERROR_PATCHWELCOME;
576 static int create_stream(AVFormatContext *s)
578 XCBGrabContext *c = s->priv_data;
579 AVStream *st = avformat_new_stream(s, NULL);
580 xcb_get_geometry_cookie_t gc;
581 xcb_get_geometry_reply_t *geo;
582 int64_t frame_size_bits;
586 return AVERROR(ENOMEM);
588 ret = av_parse_video_rate(&st->avg_frame_rate, c->framerate);
592 avpriv_set_pts_info(st, 64, 1, 1000000);
594 gc = xcb_get_geometry(c->conn, c->window_id);
595 geo = xcb_get_geometry_reply(c->conn, gc, NULL);
597 av_log(s, AV_LOG_ERROR, "Can't find window '0x%x', aborting.\n", c->window_id);
598 return AVERROR_EXTERNAL;
601 if (!c->width || !c->height) {
602 c->width = geo->width;
603 c->height = geo->height;
606 if (c->x + c->width > geo->width ||
607 c->y + c->height > geo->height) {
608 av_log(s, AV_LOG_ERROR,
609 "Capture area %dx%d at position %d.%d "
610 "outside the screen size %dx%d\n",
613 geo->width, geo->height);
615 return AVERROR(EINVAL);
618 c->time_base = (AVRational){ st->avg_frame_rate.den,
619 st->avg_frame_rate.num };
620 c->frame_duration = av_rescale_q(1, c->time_base, AV_TIME_BASE_Q);
621 c->time_frame = av_gettime_relative();
623 ret = pixfmt_from_pixmap_format(s, geo->depth, &st->codecpar->format, &c->bpp);
628 frame_size_bits = (int64_t)c->width * c->height * c->bpp;
629 if (frame_size_bits / 8 + AV_INPUT_BUFFER_PADDING_SIZE > INT_MAX) {
630 av_log(s, AV_LOG_ERROR, "Captured area is too large\n");
631 return AVERROR_PATCHWELCOME;
633 c->frame_size = frame_size_bits / 8;
635 #if CONFIG_LIBXCB_SHM
636 c->shm_pool = av_buffer_pool_init2(c->frame_size + AV_INPUT_BUFFER_PADDING_SIZE,
637 c->conn, allocate_shm_buffer, NULL);
639 return AVERROR(ENOMEM);
642 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
643 st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
644 st->codecpar->width = c->width;
645 st->codecpar->height = c->height;
646 st->codecpar->bit_rate = av_rescale(frame_size_bits, st->avg_frame_rate.num, st->avg_frame_rate.den);
651 static void draw_rectangle(AVFormatContext *s)
653 XCBGrabContext *c = s->priv_data;
654 xcb_gcontext_t gc = xcb_generate_id(c->conn);
655 uint32_t mask = XCB_GC_FOREGROUND |
660 uint32_t values[] = { c->screen->black_pixel,
661 c->screen->white_pixel,
663 XCB_LINE_STYLE_DOUBLE_DASH,
664 XCB_FILL_STYLE_SOLID };
665 xcb_rectangle_t r = { 1, 1,
666 c->width + c->region_border * 2 - 3,
667 c->height + c->region_border * 2 - 3 };
669 xcb_create_gc(c->conn, gc, c->window, mask, values);
671 xcb_poly_rectangle(c->conn, c->window, gc, 1, &r);
674 static void setup_window(AVFormatContext *s)
676 XCBGrabContext *c = s->priv_data;
677 uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
678 uint32_t values[] = { 1,
679 XCB_EVENT_MASK_EXPOSURE |
680 XCB_EVENT_MASK_STRUCTURE_NOTIFY };
681 av_unused xcb_rectangle_t rect = { 0, 0, c->width, c->height };
683 c->window = xcb_generate_id(c->conn);
685 xcb_create_window(c->conn, XCB_COPY_FROM_PARENT,
688 c->x - c->region_border,
689 c->y - c->region_border,
690 c->width + c->region_border * 2,
691 c->height + c->region_border * 2,
693 XCB_WINDOW_CLASS_INPUT_OUTPUT,
694 XCB_COPY_FROM_PARENT,
697 #if CONFIG_LIBXCB_SHAPE
698 xcb_shape_rectangles(c->conn, XCB_SHAPE_SO_SUBTRACT,
699 XCB_SHAPE_SK_BOUNDING, XCB_CLIP_ORDERING_UNSORTED,
701 c->region_border, c->region_border,
705 xcb_map_window(c->conn, c->window);
710 #define CROSSHAIR_CURSOR 34
712 static xcb_rectangle_t rectangle_from_corners(xcb_point_t *corner_a,
713 xcb_point_t *corner_b)
715 xcb_rectangle_t rectangle;
716 rectangle.x = FFMIN(corner_a->x, corner_b->x);
717 rectangle.y = FFMIN(corner_a->y, corner_b->y);
718 rectangle.width = FFABS(corner_a->x - corner_b->x);
719 rectangle.height = FFABS(corner_a->y - corner_b->y);
723 static int select_region(AVFormatContext *s)
725 XCBGrabContext *c = s->priv_data;
726 xcb_connection_t *conn = c->conn;
727 xcb_screen_t *screen = c->screen;
729 int ret = 0, done = 0, was_pressed = 0;
731 xcb_font_t cursor_font;
732 xcb_point_t press_position;
733 xcb_generic_event_t *event;
734 xcb_rectangle_t rectangle = { 0 };
735 xcb_grab_pointer_reply_t *reply;
736 xcb_grab_pointer_cookie_t cookie;
738 xcb_window_t root_window = screen->root;
739 xcb_gcontext_t gc = xcb_generate_id(conn);
740 uint32_t mask = XCB_GC_FUNCTION | XCB_GC_SUBWINDOW_MODE;
741 uint32_t values[] = { XCB_GX_INVERT, XCB_SUBWINDOW_MODE_INCLUDE_INFERIORS };
742 xcb_create_gc(conn, gc, root_window, mask, values);
744 cursor_font = xcb_generate_id(conn);
745 xcb_open_font(conn, cursor_font, strlen("cursor"), "cursor");
746 cursor = xcb_generate_id(conn);
747 xcb_create_glyph_cursor(conn, cursor, cursor_font, cursor_font,
748 CROSSHAIR_CURSOR, CROSSHAIR_CURSOR + 1, 0, 0, 0,
749 0xFFFF, 0xFFFF, 0xFFFF);
750 cookie = xcb_grab_pointer(conn, 0, root_window,
751 XCB_EVENT_MASK_BUTTON_PRESS |
752 XCB_EVENT_MASK_BUTTON_RELEASE |
753 XCB_EVENT_MASK_BUTTON_MOTION,
754 XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC,
755 root_window, cursor, XCB_CURRENT_TIME);
756 reply = xcb_grab_pointer_reply(conn, cookie, NULL);
757 if (!reply || reply->status != XCB_GRAB_STATUS_SUCCESS) {
758 av_log(s, AV_LOG_ERROR,
759 "Failed to select region. Could not grab pointer.\n");
766 xcb_grab_server(conn);
768 while (!done && (event = xcb_wait_for_event(conn))) {
769 switch (event->response_type & ~0x80) {
770 case XCB_BUTTON_PRESS: {
771 xcb_button_press_event_t *press = (xcb_button_press_event_t *)event;
772 press_position = (xcb_point_t){ press->event_x, press->event_y };
773 rectangle.x = press_position.x;
774 rectangle.y = press_position.y;
775 xcb_poly_rectangle(conn, root_window, gc, 1, &rectangle);
779 case XCB_MOTION_NOTIFY: {
781 xcb_motion_notify_event_t *motion =
782 (xcb_motion_notify_event_t *)event;
783 xcb_point_t cursor_position = { motion->event_x, motion->event_y };
784 xcb_poly_rectangle(conn, root_window, gc, 1, &rectangle);
785 rectangle = rectangle_from_corners(&press_position, &cursor_position);
786 xcb_poly_rectangle(conn, root_window, gc, 1, &rectangle);
790 case XCB_BUTTON_RELEASE: {
791 xcb_poly_rectangle(conn, root_window, gc, 1, &rectangle);
801 c->width = rectangle.width;
802 c->height = rectangle.height;
803 if (c->width && c->height) {
810 xcb_ungrab_server(conn);
811 xcb_ungrab_pointer(conn, XCB_CURRENT_TIME);
815 xcb_free_cursor(conn, cursor);
816 xcb_close_font(conn, cursor_font);
817 xcb_free_gc(conn, gc);
821 static av_cold int xcbgrab_read_header(AVFormatContext *s)
823 XCBGrabContext *c = s->priv_data;
825 const xcb_setup_t *setup;
826 char *display_name = av_strdup(s->url);
829 return AVERROR(ENOMEM);
831 if (!sscanf(s->url, "%[^+]+%d,%d", display_name, &c->x, &c->y)) {
833 sscanf(s->url, "+%d,%d", &c->x, &c->y);
836 c->conn = xcb_connect(display_name[0] ? display_name : NULL, &screen_num);
837 av_freep(&display_name);
839 if ((ret = xcb_connection_has_error(c->conn))) {
840 av_log(s, AV_LOG_ERROR, "Cannot open display %s, error %d.\n",
841 s->url[0] ? s->url : "default", ret);
845 setup = xcb_get_setup(c->conn);
847 c->screen = get_screen(setup, screen_num);
849 av_log(s, AV_LOG_ERROR, "The screen %d does not exist.\n",
851 xcbgrab_read_close(s);
855 if (c->window_id == XCB_NONE)
856 c->window_id = c->screen->root;
858 if (c->select_region) {
859 av_log(s, AV_LOG_WARNING, "select_region ignored with window_id.\n");
860 c->select_region = 0;
862 if (c->follow_mouse) {
863 av_log(s, AV_LOG_WARNING, "follow_mouse ignored with window_id.\n");
868 if (c->select_region) {
869 ret = select_region(s);
871 xcbgrab_read_close(s);
876 ret = create_stream(s);
879 xcbgrab_read_close(s);
883 #if CONFIG_LIBXCB_SHM
884 c->has_shm = check_shm(c->conn);
887 #if CONFIG_LIBXCB_XFIXES
889 if (!(c->draw_mouse = check_xfixes(c->conn))) {
890 av_log(s, AV_LOG_WARNING,
891 "XFixes not available, cannot draw the mouse.\n");
894 avpriv_report_missing_feature(s, "%d bits per pixel screen",
907 AVInputFormat ff_xcbgrab_demuxer = {
909 .long_name = NULL_IF_CONFIG_SMALL("X11 screen capture, using XCB"),
910 .priv_data_size = sizeof(XCBGrabContext),
911 .read_header = xcbgrab_read_header,
912 .read_packet = xcbgrab_read_packet,
913 .read_close = xcbgrab_read_close,
914 .flags = AVFMT_NOFILE,
915 .priv_class = &xcbgrab_class,