FFmpeg  4.3.8
xcbgrab.c
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1 /*
2  * XCB input grabber
3  * Copyright (C) 2014 Luca Barbato <lu_zero@gentoo.org>
4  *
5  * This file is part of FFmpeg.
6  *
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.
11  *
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.
16  *
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
20  */
21 
22 #include "config.h"
23 
24 #include <stdlib.h>
25 #include <xcb/xcb.h>
26 
27 #if CONFIG_LIBXCB_XFIXES
28 #include <xcb/xfixes.h>
29 #endif
30 
31 #if CONFIG_LIBXCB_SHM
32 #include <sys/shm.h>
33 #include <xcb/shm.h>
34 #endif
35 
36 #if CONFIG_LIBXCB_SHAPE
37 #include <xcb/shape.h>
38 #endif
39 
40 #include "libavutil/internal.h"
41 #include "libavutil/mathematics.h"
42 #include "libavutil/opt.h"
43 #include "libavutil/parseutils.h"
44 #include "libavutil/time.h"
45 
46 #include "libavformat/avformat.h"
47 #include "libavformat/internal.h"
48 
49 typedef struct XCBGrabContext {
50  const AVClass *class;
51 
52  xcb_connection_t *conn;
53  xcb_screen_t *screen;
54  xcb_window_t window;
55 #if CONFIG_LIBXCB_SHM
56  AVBufferPool *shm_pool;
57 #endif
61 
62  int x, y;
63  int width, height;
65  int bpp;
66 
71  int centered;
72 
73  const char *framerate;
74 
75  int has_shm;
77 
78 #define FOLLOW_CENTER -1
79 
80 #define OFFSET(x) offsetof(XCBGrabContext, x)
81 #define D AV_OPT_FLAG_DECODING_PARAM
82 static const AVOption options[] = {
83  { "x", "Initial x coordinate.", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D },
84  { "y", "Initial y coordinate.", OFFSET(y), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D },
85  { "grab_x", "Initial x coordinate.", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D },
86  { "grab_y", "Initial y coordinate.", OFFSET(y), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D },
87  { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL }, 0, 0, D },
88  { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "ntsc" }, 0, 0, D },
89  { "draw_mouse", "Draw the mouse pointer.", OFFSET(draw_mouse), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, D },
90  { "follow_mouse", "Move the grabbing region when the mouse pointer reaches within specified amount of pixels to the edge of region.",
91  OFFSET(follow_mouse), AV_OPT_TYPE_INT, { .i64 = 0 }, FOLLOW_CENTER, INT_MAX, D, "follow_mouse" },
92  { "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" },
93  { "show_region", "Show the grabbing region.", OFFSET(show_region), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, D },
94  { "region_border", "Set the region border thickness.", OFFSET(region_border), AV_OPT_TYPE_INT, { .i64 = 3 }, 1, 128, D },
95  { NULL },
96 };
97 
98 static const AVClass xcbgrab_class = {
99  .class_name = "xcbgrab indev",
100  .item_name = av_default_item_name,
101  .option = options,
102  .version = LIBAVUTIL_VERSION_INT,
104 };
105 
107  xcb_query_pointer_reply_t *p,
108  xcb_get_geometry_reply_t *geo)
109 {
110  XCBGrabContext *c = s->priv_data;
111  int x = c->x, y = c->y;
112  int w = c->width, h = c->height, f = c->follow_mouse;
113  int p_x, p_y;
114 
115  if (!p || !geo)
116  return AVERROR(EIO);
117 
118  p_x = p->win_x;
119  p_y = p->win_y;
120 
121  if (f == FOLLOW_CENTER) {
122  x = p_x - w / 2;
123  y = p_y - h / 2;
124  } else {
125  int left = x + f;
126  int right = x + w - f;
127  int top = y + f;
128  int bottom = y + h - f;
129  if (p_x > right) {
130  x += p_x - right;
131  } else if (p_x < left) {
132  x -= left - p_x;
133  }
134  if (p_y > bottom) {
135  y += p_y - bottom;
136  } else if (p_y < top) {
137  y -= top - p_y;
138  }
139  }
140 
141  c->x = FFMIN(FFMAX(0, x), geo->width - w);
142  c->y = FFMIN(FFMAX(0, y), geo->height - h);
143 
144  return 0;
145 }
146 
147 static void xcbgrab_image_reply_free(void *opaque, uint8_t *data)
148 {
149  free(opaque);
150 }
151 
153 {
154  XCBGrabContext *c = s->priv_data;
155  xcb_get_image_cookie_t iq;
156  xcb_get_image_reply_t *img;
157  xcb_drawable_t drawable = c->screen->root;
158  xcb_generic_error_t *e = NULL;
159  uint8_t *data;
160  int length;
161 
162  iq = xcb_get_image(c->conn, XCB_IMAGE_FORMAT_Z_PIXMAP, drawable,
163  c->x, c->y, c->width, c->height, ~0);
164 
165  img = xcb_get_image_reply(c->conn, iq, &e);
166 
167  if (e) {
168  av_log(s, AV_LOG_ERROR,
169  "Cannot get the image data "
170  "event_error: response_type:%u error_code:%u "
171  "sequence:%u resource_id:%u minor_code:%u major_code:%u.\n",
172  e->response_type, e->error_code,
173  e->sequence, e->resource_id, e->minor_code, e->major_code);
174  free(e);
175  return AVERROR(EACCES);
176  }
177 
178  if (!img)
179  return AVERROR(EAGAIN);
180 
181  data = xcb_get_image_data(img);
182  length = xcb_get_image_data_length(img);
183 
184  av_init_packet(pkt);
185 
186  pkt->buf = av_buffer_create(data, length, xcbgrab_image_reply_free, img, 0);
187  if (!pkt->buf) {
188  free(img);
189  return AVERROR(ENOMEM);
190  }
191 
192  pkt->data = data;
193  pkt->size = length;
194 
195  return 0;
196 }
197 
199 {
200  XCBGrabContext *c = s->priv_data;
201  int64_t curtime, delay;
202 
203  c->time_frame += c->frame_duration;
204 
205  for (;;) {
206  curtime = av_gettime();
207  delay = c->time_frame - curtime;
208  if (delay <= 0)
209  break;
210  av_usleep(delay);
211  }
212 
213  return curtime;
214 }
215 
216 #if CONFIG_LIBXCB_SHM
217 static int check_shm(xcb_connection_t *conn)
218 {
219  xcb_shm_query_version_cookie_t cookie = xcb_shm_query_version(conn);
220  xcb_shm_query_version_reply_t *reply;
221 
222  reply = xcb_shm_query_version_reply(conn, cookie, NULL);
223  if (reply) {
224  free(reply);
225  return 1;
226  }
227 
228  return 0;
229 }
230 
231 static void free_shm_buffer(void *opaque, uint8_t *data)
232 {
233  shmdt(data);
234 }
235 
236 static AVBufferRef *allocate_shm_buffer(void *opaque, int size)
237 {
238  xcb_connection_t *conn = opaque;
239  xcb_shm_seg_t segment;
240  AVBufferRef *ref;
241  uint8_t *data;
242  int id;
243 
244  id = shmget(IPC_PRIVATE, size, IPC_CREAT | 0777);
245  if (id == -1)
246  return NULL;
247 
248  segment = xcb_generate_id(conn);
249  xcb_shm_attach(conn, segment, id, 0);
250  data = shmat(id, NULL, 0);
251  shmctl(id, IPC_RMID, 0);
252  if ((intptr_t)data == -1 || !data)
253  return NULL;
254 
255  ref = av_buffer_create(data, size, free_shm_buffer, (void *)(ptrdiff_t)segment, 0);
256  if (!ref)
257  shmdt(data);
258 
259  return ref;
260 }
261 
262 static int xcbgrab_frame_shm(AVFormatContext *s, AVPacket *pkt)
263 {
264  XCBGrabContext *c = s->priv_data;
265  xcb_shm_get_image_cookie_t iq;
266  xcb_shm_get_image_reply_t *img;
267  xcb_drawable_t drawable = c->screen->root;
268  xcb_generic_error_t *e = NULL;
269  AVBufferRef *buf;
270  xcb_shm_seg_t segment;
271 
272  buf = av_buffer_pool_get(c->shm_pool);
273  if (!buf) {
274  av_log(s, AV_LOG_ERROR, "Could not get shared memory buffer.\n");
275  return AVERROR(ENOMEM);
276  }
277  segment = (xcb_shm_seg_t)av_buffer_pool_buffer_get_opaque(buf);
278 
279  iq = xcb_shm_get_image(c->conn, drawable,
280  c->x, c->y, c->width, c->height, ~0,
281  XCB_IMAGE_FORMAT_Z_PIXMAP, segment, 0);
282  img = xcb_shm_get_image_reply(c->conn, iq, &e);
283 
284  xcb_flush(c->conn);
285 
286  if (e) {
287  av_log(s, AV_LOG_ERROR,
288  "Cannot get the image data "
289  "event_error: response_type:%u error_code:%u "
290  "sequence:%u resource_id:%u minor_code:%u major_code:%u.\n",
291  e->response_type, e->error_code,
292  e->sequence, e->resource_id, e->minor_code, e->major_code);
293 
294  free(e);
295  av_buffer_unref(&buf);
296  return AVERROR(EACCES);
297  }
298 
299  free(img);
300 
301  av_init_packet(pkt);
302 
303  pkt->buf = buf;
304  pkt->data = buf->data;
305  pkt->size = c->frame_size;
306 
307  return 0;
308 }
309 #endif /* CONFIG_LIBXCB_SHM */
310 
311 #if CONFIG_LIBXCB_XFIXES
312 static int check_xfixes(xcb_connection_t *conn)
313 {
314  xcb_xfixes_query_version_cookie_t cookie;
315  xcb_xfixes_query_version_reply_t *reply;
316 
317  cookie = xcb_xfixes_query_version(conn, XCB_XFIXES_MAJOR_VERSION,
318  XCB_XFIXES_MINOR_VERSION);
319  reply = xcb_xfixes_query_version_reply(conn, cookie, NULL);
320 
321  if (reply) {
322  free(reply);
323  return 1;
324  }
325  return 0;
326 }
327 
328 #define BLEND(target, source, alpha) \
329  (target) + ((source) * (255 - (alpha)) + 255 / 2) / 255
330 
331 static void xcbgrab_draw_mouse(AVFormatContext *s, AVPacket *pkt,
332  xcb_query_pointer_reply_t *p,
333  xcb_get_geometry_reply_t *geo)
334 {
335  XCBGrabContext *gr = s->priv_data;
336  uint32_t *cursor;
337  uint8_t *image = pkt->data;
338  int stride = gr->bpp / 8;
339  xcb_xfixes_get_cursor_image_cookie_t cc;
340  xcb_xfixes_get_cursor_image_reply_t *ci;
341  int cx, cy, x, y, w, h, c_off, i_off;
342 
343  cc = xcb_xfixes_get_cursor_image(gr->conn);
344  ci = xcb_xfixes_get_cursor_image_reply(gr->conn, cc, NULL);
345  if (!ci)
346  return;
347 
348  cursor = xcb_xfixes_get_cursor_image_cursor_image(ci);
349  if (!cursor)
350  return;
351 
352  cx = ci->x - ci->xhot;
353  cy = ci->y - ci->yhot;
354 
355  x = FFMAX(cx, gr->x);
356  y = FFMAX(cy, gr->y);
357 
358  w = FFMIN(cx + ci->width, gr->x + gr->width) - x;
359  h = FFMIN(cy + ci->height, gr->y + gr->height) - y;
360 
361  c_off = x - cx;
362  i_off = x - gr->x;
363 
364  cursor += (y - cy) * ci->width;
365  image += (y - gr->y) * gr->width * stride;
366 
367  for (y = 0; y < h; y++) {
368  cursor += c_off;
369  image += i_off * stride;
370  for (x = 0; x < w; x++, cursor++, image += stride) {
371  int r, g, b, a;
372 
373  r = *cursor & 0xff;
374  g = (*cursor >> 8) & 0xff;
375  b = (*cursor >> 16) & 0xff;
376  a = (*cursor >> 24) & 0xff;
377 
378  if (!a)
379  continue;
380 
381  if (a == 255) {
382  image[0] = r;
383  image[1] = g;
384  image[2] = b;
385  } else {
386  image[0] = BLEND(r, image[0], a);
387  image[1] = BLEND(g, image[1], a);
388  image[2] = BLEND(b, image[2], a);
389  }
390 
391  }
392  cursor += ci->width - w - c_off;
393  image += (gr->width - w - i_off) * stride;
394  }
395 
396  free(ci);
397 }
398 #endif /* CONFIG_LIBXCB_XFIXES */
399 
401 {
402  XCBGrabContext *c = s->priv_data;
403  const uint32_t args[] = { c->x - c->region_border,
404  c->y - c->region_border };
405 
406  xcb_configure_window(c->conn,
407  c->window,
408  XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y,
409  args);
410 }
411 
413 {
414  XCBGrabContext *c = s->priv_data;
415  xcb_query_pointer_cookie_t pc;
416  xcb_get_geometry_cookie_t gc;
417  xcb_query_pointer_reply_t *p = NULL;
418  xcb_get_geometry_reply_t *geo = NULL;
419  int ret = 0;
420  int64_t pts;
421 
422  pts = wait_frame(s, pkt);
423 
424  if (c->follow_mouse || c->draw_mouse) {
425  pc = xcb_query_pointer(c->conn, c->screen->root);
426  gc = xcb_get_geometry(c->conn, c->screen->root);
427  p = xcb_query_pointer_reply(c->conn, pc, NULL);
428  geo = xcb_get_geometry_reply(c->conn, gc, NULL);
429  }
430 
431  if (c->follow_mouse && p->same_screen)
432  xcbgrab_reposition(s, p, geo);
433 
434  if (c->show_region)
436 
437 #if CONFIG_LIBXCB_SHM
438  if (c->has_shm && xcbgrab_frame_shm(s, pkt) < 0) {
439  av_log(s, AV_LOG_WARNING, "Continuing without shared memory.\n");
440  c->has_shm = 0;
441  }
442 #endif
443  if (!c->has_shm)
444  ret = xcbgrab_frame(s, pkt);
445  pkt->dts = pkt->pts = pts;
446  pkt->duration = c->frame_duration;
447 
448 #if CONFIG_LIBXCB_XFIXES
449  if (ret >= 0 && c->draw_mouse && p->same_screen)
450  xcbgrab_draw_mouse(s, pkt, p, geo);
451 #endif
452 
453  free(p);
454  free(geo);
455 
456  return ret;
457 }
458 
460 {
462 
463 #if CONFIG_LIBXCB_SHM
464  av_buffer_pool_uninit(&ctx->shm_pool);
465 #endif
466 
467  xcb_disconnect(ctx->conn);
468 
469  return 0;
470 }
471 
472 static xcb_screen_t *get_screen(const xcb_setup_t *setup, int screen_num)
473 {
474  xcb_screen_iterator_t it = xcb_setup_roots_iterator(setup);
475  xcb_screen_t *screen = NULL;
476 
477  for (; it.rem > 0; xcb_screen_next (&it)) {
478  if (!screen_num) {
479  screen = it.data;
480  break;
481  }
482 
483  screen_num--;
484  }
485 
486  return screen;
487 }
488 
490  int *pix_fmt, int *bpp)
491 {
492  XCBGrabContext *c = s->priv_data;
493  const xcb_setup_t *setup = xcb_get_setup(c->conn);
494  const xcb_format_t *fmt = xcb_setup_pixmap_formats(setup);
495  int length = xcb_setup_pixmap_formats_length(setup);
496 
497  *pix_fmt = 0;
498 
499  while (length--) {
500  if (fmt->depth == depth) {
501  switch (depth) {
502  case 32:
503  if (fmt->bits_per_pixel == 32)
504  *pix_fmt = AV_PIX_FMT_0RGB;
505  break;
506  case 24:
507  if (fmt->bits_per_pixel == 32)
508  *pix_fmt = AV_PIX_FMT_0RGB32;
509  else if (fmt->bits_per_pixel == 24)
510  *pix_fmt = AV_PIX_FMT_RGB24;
511  break;
512  case 16:
513  if (fmt->bits_per_pixel == 16)
514  *pix_fmt = AV_PIX_FMT_RGB565;
515  break;
516  case 15:
517  if (fmt->bits_per_pixel == 16)
518  *pix_fmt = AV_PIX_FMT_RGB555;
519  break;
520  case 8:
521  if (fmt->bits_per_pixel == 8)
522  *pix_fmt = AV_PIX_FMT_RGB8;
523  break;
524  }
525  }
526 
527  if (*pix_fmt) {
528  *bpp = fmt->bits_per_pixel;
529  return 0;
530  }
531 
532  fmt++;
533  }
534  avpriv_report_missing_feature(s, "Mapping this pixmap format");
535 
536  return AVERROR_PATCHWELCOME;
537 }
538 
540 {
541  XCBGrabContext *c = s->priv_data;
543  xcb_get_geometry_cookie_t gc;
544  xcb_get_geometry_reply_t *geo;
545  int64_t frame_size_bits;
546  int ret;
547 
548  if (!st)
549  return AVERROR(ENOMEM);
550 
552  if (ret < 0)
553  return ret;
554 
555  avpriv_set_pts_info(st, 64, 1, 1000000);
556 
557  gc = xcb_get_geometry(c->conn, c->screen->root);
558  geo = xcb_get_geometry_reply(c->conn, gc, NULL);
559  if (!geo)
560  return AVERROR_EXTERNAL;
561 
562  if (!c->width || !c->height) {
563  c->width = geo->width;
564  c->height = geo->height;
565  }
566 
567  if (c->x + c->width > geo->width ||
568  c->y + c->height > geo->height) {
569  av_log(s, AV_LOG_ERROR,
570  "Capture area %dx%d at position %d.%d "
571  "outside the screen size %dx%d\n",
572  c->width, c->height,
573  c->x, c->y,
574  geo->width, geo->height);
575  free(geo);
576  return AVERROR(EINVAL);
577  }
578 
580  st->avg_frame_rate.num };
582  c->time_frame = av_gettime();
583 
584  ret = pixfmt_from_pixmap_format(s, geo->depth, &st->codecpar->format, &c->bpp);
585  free(geo);
586  if (ret < 0)
587  return ret;
588 
589  frame_size_bits = (int64_t)c->width * c->height * c->bpp;
590  if (frame_size_bits / 8 + AV_INPUT_BUFFER_PADDING_SIZE > INT_MAX) {
591  av_log(s, AV_LOG_ERROR, "Captured area is too large\n");
592  return AVERROR_PATCHWELCOME;
593  }
594  c->frame_size = frame_size_bits / 8;
595 
596 #if CONFIG_LIBXCB_SHM
598  c->conn, allocate_shm_buffer, NULL);
599  if (!c->shm_pool)
600  return AVERROR(ENOMEM);
601 #endif
602 
605  st->codecpar->width = c->width;
606  st->codecpar->height = c->height;
607  st->codecpar->bit_rate = av_rescale(frame_size_bits, st->avg_frame_rate.num, st->avg_frame_rate.den);
608 
609  return ret;
610 }
611 
613 {
614  XCBGrabContext *c = s->priv_data;
615  xcb_gcontext_t gc = xcb_generate_id(c->conn);
616  uint32_t mask = XCB_GC_FOREGROUND |
617  XCB_GC_BACKGROUND |
618  XCB_GC_LINE_WIDTH |
619  XCB_GC_LINE_STYLE |
620  XCB_GC_FILL_STYLE;
621  uint32_t values[] = { c->screen->black_pixel,
622  c->screen->white_pixel,
623  c->region_border,
624  XCB_LINE_STYLE_DOUBLE_DASH,
625  XCB_FILL_STYLE_SOLID };
626  xcb_rectangle_t r = { 1, 1,
627  c->width + c->region_border * 2 - 3,
628  c->height + c->region_border * 2 - 3 };
629 
630  xcb_create_gc(c->conn, gc, c->window, mask, values);
631 
632  xcb_poly_rectangle(c->conn, c->window, gc, 1, &r);
633 }
634 
636 {
637  XCBGrabContext *c = s->priv_data;
638  uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
639  uint32_t values[] = { 1,
640  XCB_EVENT_MASK_EXPOSURE |
641  XCB_EVENT_MASK_STRUCTURE_NOTIFY };
642  av_unused xcb_rectangle_t rect = { 0, 0, c->width, c->height };
643 
644  c->window = xcb_generate_id(c->conn);
645 
646  xcb_create_window(c->conn, XCB_COPY_FROM_PARENT,
647  c->window,
648  c->screen->root,
649  c->x - c->region_border,
650  c->y - c->region_border,
651  c->width + c->region_border * 2,
652  c->height + c->region_border * 2,
653  0,
654  XCB_WINDOW_CLASS_INPUT_OUTPUT,
655  XCB_COPY_FROM_PARENT,
656  mask, values);
657 
658 #if CONFIG_LIBXCB_SHAPE
659  xcb_shape_rectangles(c->conn, XCB_SHAPE_SO_SUBTRACT,
660  XCB_SHAPE_SK_BOUNDING, XCB_CLIP_ORDERING_UNSORTED,
661  c->window,
663  1, &rect);
664 #endif
665 
666  xcb_map_window(c->conn, c->window);
667 
668  draw_rectangle(s);
669 }
670 
672 {
673  XCBGrabContext *c = s->priv_data;
674  int screen_num, ret;
675  const xcb_setup_t *setup;
676  char *display_name = av_strdup(s->url);
677 
678  if (!display_name)
679  return AVERROR(ENOMEM);
680 
681  if (!sscanf(s->url, "%[^+]+%d,%d", display_name, &c->x, &c->y)) {
682  *display_name = 0;
683  if(sscanf(s->url, "+%d,%d", &c->x, &c->y) != 2) {
684  if (*s->url)
685  av_log(s, AV_LOG_WARNING, "Ambigous URL: %s\n", s->url);
686  }
687  }
688 
689  c->conn = xcb_connect(display_name[0] ? display_name : NULL, &screen_num);
690  av_freep(&display_name);
691 
692  if ((ret = xcb_connection_has_error(c->conn))) {
693  av_log(s, AV_LOG_ERROR, "Cannot open display %s, error %d.\n",
694  s->url[0] ? s->url : "default", ret);
695  return AVERROR(EIO);
696  }
697 
698  setup = xcb_get_setup(c->conn);
699 
700  c->screen = get_screen(setup, screen_num);
701  if (!c->screen) {
702  av_log(s, AV_LOG_ERROR, "The screen %d does not exist.\n",
703  screen_num);
705  return AVERROR(EIO);
706  }
707 
708  ret = create_stream(s);
709 
710  if (ret < 0) {
712  return ret;
713  }
714 
715 #if CONFIG_LIBXCB_SHM
716  c->has_shm = check_shm(c->conn);
717 #endif
718 
719 #if CONFIG_LIBXCB_XFIXES
720  if (c->draw_mouse) {
721  if (!(c->draw_mouse = check_xfixes(c->conn))) {
723  "XFixes not available, cannot draw the mouse.\n");
724  }
725  if (c->bpp < 24) {
726  avpriv_report_missing_feature(s, "%d bits per pixel screen",
727  c->bpp);
728  c->draw_mouse = 0;
729  }
730  }
731 #endif
732 
733  if (c->show_region)
734  setup_window(s);
735 
736  return 0;
737 }
738 
740  .name = "x11grab",
741  .long_name = NULL_IF_CONFIG_SMALL("X11 screen capture, using XCB"),
742  .priv_data_size = sizeof(XCBGrabContext),
746  .flags = AVFMT_NOFILE,
747  .priv_class = &xcbgrab_class,
748 };
static xcb_screen_t * get_screen(const xcb_setup_t *setup, int screen_num)
Definition: xcbgrab.c:472
AVInputFormat ff_xcbgrab_demuxer
Definition: xcbgrab.c:739
#define NULL
Definition: coverity.c:32
xcb_connection_t * conn
Definition: xcbgrab.c:52
void * av_buffer_pool_buffer_get_opaque(AVBufferRef *ref)
Query the original opaque parameter of an allocated buffer in the pool.
Definition: buffer.c:368
static enum AVPixelFormat pix_fmt
static av_cold int xcbgrab_read_header(AVFormatContext *s)
Definition: xcbgrab.c:671
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it...
Definition: buffer.c:125
int size
int av_parse_video_rate(AVRational *rate, const char *arg)
Parse str and store the detected values in *rate.
Definition: parseutils.c:179
static int create_stream(AVFormatContext *s)
Definition: xcbgrab.c:539
AVOption.
Definition: opt.h:246
static void xcbgrab_update_region(AVFormatContext *s)
Definition: xcbgrab.c:400
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:68
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4948
const char * g
Definition: vf_curves.c:115
static void draw_rectangle(AVFormatContext *s)
Definition: xcbgrab.c:612
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int num
Numerator.
Definition: rational.h:59
int size
Definition: packet.h:356
const char * b
Definition: vf_curves.c:116
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
xcb_window_t window
Definition: xcbgrab.c:54
int av_usleep(unsigned usec)
Sleep for a period of time.
Definition: time.c:84
static AVPacket pkt
int stride
Definition: mace.c:144
int centered
Definition: xcbgrab.c:71
Format I/O context.
Definition: avformat.h:1351
#define img
int frame_size
Definition: xcbgrab.c:64
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
uint8_t
#define av_cold
Definition: attributes.h:88
int width
Video only.
Definition: codec_par.h:126
AVOptions.
#define f(width, name)
Definition: cbs_vp9.c:255
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:373
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4526
static const AVClass xcbgrab_class
Definition: xcbgrab.c:98
xcb_screen_t * screen
Definition: xcbgrab.c:53
static int pixfmt_from_pixmap_format(AVFormatContext *s, int depth, int *pix_fmt, int *bpp)
Definition: xcbgrab.c:489
const char data[16]
Definition: mxf.c:91
uint8_t * data
Definition: packet.h:355
static int xcbgrab_frame(AVFormatContext *s, AVPacket *pkt)
Definition: xcbgrab.c:152
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
#define av_log(a,...)
The buffer pool.
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
AVRational time_base
Definition: xcbgrab.c:59
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static const uint16_t mask[17]
Definition: lzw.c:38
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:188
char * url
input or output URL.
Definition: avformat.h:1447
const char * r
Definition: vf_curves.c:114
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: packet.h:338
AVBufferRef * av_buffer_create(uint8_t *data, int size, void(*free)(void *opaque, uint8_t *data), void *opaque, int flags)
Create an AVBuffer from an existing array.
Definition: buffer.c:29
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:949
#define FFMAX(a, b)
Definition: common.h:94
Definition: hls.c:68
common internal API header
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
Definition: mathematics.c:129
#define FFMIN(a, b)
Definition: common.h:96
static const AVOption options[]
Definition: xcbgrab.c:82
const char * framerate
Definition: xcbgrab.c:73
uint8_t w
Definition: llviddspenc.c:38
AVFormatContext * ctx
Definition: movenc.c:48
#define s(width, name)
Definition: cbs_vp9.c:257
AVBufferPool * av_buffer_pool_init2(int size, void *opaque, AVBufferRef *(*alloc)(void *opaque, int size), void(*pool_free)(void *opaque))
Allocate and initialize a buffer pool with a more complex allocator.
Definition: buffer.c:218
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:545
int64_t av_gettime(void)
Get the current time in microseconds.
Definition: time.c:39
Stream structure.
Definition: avformat.h:876
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
int64_t time_frame
Definition: xcbgrab.c:58
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:253
static int64_t wait_frame(AVFormatContext *s, AVPacket *pkt)
Definition: xcbgrab.c:198
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:260
long long int64_t
Definition: coverity.c:34
uint8_t * data
The data buffer.
Definition: buffer.h:89
int show_region
Definition: xcbgrab.c:69
Describe the class of an AVClass context structure.
Definition: log.h:67
Definition: f_ebur128.c:91
void av_buffer_pool_uninit(AVBufferPool **ppool)
Mark the pool as being available for freeing.
Definition: buffer.c:282
static int xcbgrab_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: xcbgrab.c:412
Rational number (pair of numerator and denominator).
Definition: rational.h:58
offset must point to two consecutive integers
Definition: opt.h:233
misc parsing utilities
static void xcbgrab_image_reply_free(void *opaque, uint8_t *data)
Definition: xcbgrab.c:147
#define OFFSET(x)
Definition: xcbgrab.c:80
static void setup_window(AVFormatContext *s)
Definition: xcbgrab.c:635
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
static int64_t pts
#define flags(name, subs,...)
Definition: cbs_av1.c:576
static int xcbgrab_reposition(AVFormatContext *s, xcb_query_pointer_reply_t *p, xcb_get_geometry_reply_t *geo)
Definition: xcbgrab.c:106
A reference to a data buffer.
Definition: buffer.h:81
Main libavformat public API header.
if(ret< 0)
Definition: vf_mcdeint.c:279
#define D
Definition: xcbgrab.c:81
static int ref[MAX_W *MAX_W]
Definition: jpeg2000dwt.c:107
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:458
static double c[64]
int region_border
Definition: xcbgrab.c:70
static av_cold int xcbgrab_read_close(AVFormatContext *s)
Definition: xcbgrab.c:459
packed RGB 3:3:2, 8bpp, (msb)2R 3G 3B(lsb)
Definition: pixfmt.h:86
#define AV_PIX_FMT_RGB555
Definition: pixfmt.h:385
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
Definition: avpacket.c:35
int den
Denominator.
Definition: rational.h:60
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:215
int follow_mouse
Definition: xcbgrab.c:68
void * priv_data
Format private data.
Definition: avformat.h:1379
int64_t frame_duration
Definition: xcbgrab.c:60
#define AV_PIX_FMT_RGB565
Definition: pixfmt.h:384
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: packet.h:354
int draw_mouse
Definition: xcbgrab.c:67
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:650
#define FOLLOW_CENTER
Definition: xcbgrab.c:78
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1023
AVBufferRef * av_buffer_pool_get(AVBufferPool *pool)
Allocate a new AVBuffer, reusing an old buffer from the pool when available.
Definition: buffer.c:343
packed RGB 8:8:8, 32bpp, XRGBXRGB... X=unused/undefined
Definition: pixfmt.h:237
enum AVCodecID id
#define AVERROR_EXTERNAL
Generic error in an external library.
Definition: error.h:57
This structure stores compressed data.
Definition: packet.h:332
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:348
#define av_unused
Definition: attributes.h:131
#define AV_PIX_FMT_0RGB32
Definition: pixfmt.h:374