| 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 "libavformat/avformat.h" |
| 41 | #include "libavformat/internal.h" |
| 42 | |
| 43 | #include "libavutil/mathematics.h" |
| 44 | #include "libavutil/opt.h" |
| 45 | #include "libavutil/parseutils.h" |
| 46 | #include "libavutil/time.h" |
| 47 | |
| 48 | typedef struct XCBGrabContext { |
| 49 | const AVClass *class; |
| 50 | |
| 51 | xcb_connection_t *conn; |
| 52 | xcb_screen_t *screen; |
| 53 | xcb_window_t window; |
| 54 | #if CONFIG_LIBXCB_SHM |
| 55 | xcb_shm_seg_t segment; |
| 56 | #endif |
| 57 | |
| 58 | int64_t time_frame; |
| 59 | AVRational time_base; |
| 60 | |
| 61 | int x, y; |
| 62 | int width, height; |
| 63 | int frame_size; |
| 64 | int bpp; |
| 65 | |
| 66 | int draw_mouse; |
| 67 | int follow_mouse; |
| 68 | int show_region; |
| 69 | int region_border; |
| 70 | int centered; |
| 71 | |
| 72 | const char *video_size; |
| 73 | const char *framerate; |
| 74 | |
| 75 | int has_shm; |
| 76 | } XCBGrabContext; |
| 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 | { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = "vga" }, 0, 0, D }, |
| 86 | { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "ntsc" }, 0, 0, D }, |
| 87 | { "draw_mouse", "Draw the mouse pointer.", OFFSET(draw_mouse), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, D }, |
| 88 | { "follow_mouse", "Move the grabbing region when the mouse pointer reaches within specified amount of pixels to the edge of region.", |
| 89 | OFFSET(follow_mouse), AV_OPT_TYPE_INT, { .i64 = 0 }, FOLLOW_CENTER, INT_MAX, D, "follow_mouse" }, |
| 90 | { "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" }, |
| 91 | { "show_region", "Show the grabbing region.", OFFSET(show_region), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, D }, |
| 92 | { "region_border", "Set the region border thickness.", OFFSET(region_border), AV_OPT_TYPE_INT, { .i64 = 3 }, 1, 128, D }, |
| 93 | { NULL }, |
| 94 | }; |
| 95 | |
| 96 | static const AVClass xcbgrab_class = { |
| 97 | .class_name = "xcbgrab indev", |
| 98 | .item_name = av_default_item_name, |
| 99 | .option = options, |
| 100 | .version = LIBAVUTIL_VERSION_INT, |
| 101 | .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT, |
| 102 | }; |
| 103 | |
| 104 | static int xcbgrab_reposition(AVFormatContext *s, |
| 105 | xcb_query_pointer_reply_t *p, |
| 106 | xcb_get_geometry_reply_t *geo) |
| 107 | { |
| 108 | XCBGrabContext *c = s->priv_data; |
| 109 | int x = c->x, y = c->y, p_x = p->win_x, p_y = p->win_y; |
| 110 | int w = c->width, h = c->height, f = c->follow_mouse; |
| 111 | |
| 112 | if (!p || !geo) |
| 113 | return AVERROR(EIO); |
| 114 | |
| 115 | if (f == FOLLOW_CENTER) { |
| 116 | x = p_x - w / 2; |
| 117 | y = p_y - h / 2; |
| 118 | } else { |
| 119 | int left = x + f; |
| 120 | int right = x + w - f; |
| 121 | int top = y + f; |
| 122 | int bottom = y + h + f; |
| 123 | if (p_x > right) { |
| 124 | x += p_x - right; |
| 125 | } else if (p_x < left) { |
| 126 | x -= left - p_x; |
| 127 | } |
| 128 | if (p_y > bottom) { |
| 129 | y += p_y - bottom; |
| 130 | } else if (p_y < top) { |
| 131 | y -= top - p_y; |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | c->x = FFMIN(FFMAX(0, x), geo->width - w); |
| 136 | c->y = FFMIN(FFMAX(0, y), geo->height - h); |
| 137 | |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | static int xcbgrab_frame(AVFormatContext *s, AVPacket *pkt) |
| 142 | { |
| 143 | XCBGrabContext *c = s->priv_data; |
| 144 | xcb_get_image_cookie_t iq; |
| 145 | xcb_get_image_reply_t *img; |
| 146 | xcb_drawable_t drawable = c->screen->root; |
| 147 | uint8_t *data; |
| 148 | int length, ret; |
| 149 | |
| 150 | iq = xcb_get_image(c->conn, XCB_IMAGE_FORMAT_Z_PIXMAP, drawable, |
| 151 | c->x, c->y, c->width, c->height, ~0); |
| 152 | |
| 153 | img = xcb_get_image_reply(c->conn, iq, NULL); |
| 154 | if (!img) |
| 155 | return AVERROR(EAGAIN); |
| 156 | |
| 157 | data = xcb_get_image_data(img); |
| 158 | length = xcb_get_image_data_length(img); |
| 159 | |
| 160 | ret = av_new_packet(pkt, length); |
| 161 | |
| 162 | if (!ret) |
| 163 | memcpy(pkt->data, data, length); |
| 164 | |
| 165 | free(img); |
| 166 | |
| 167 | return ret; |
| 168 | } |
| 169 | |
| 170 | static void wait_frame(AVFormatContext *s, AVPacket *pkt) |
| 171 | { |
| 172 | XCBGrabContext *c = s->priv_data; |
| 173 | int64_t curtime, delay; |
| 174 | int64_t frame_time = av_rescale_q(1, c->time_base, AV_TIME_BASE_Q); |
| 175 | |
| 176 | c->time_frame += frame_time; |
| 177 | |
| 178 | for (;;) { |
| 179 | curtime = av_gettime(); |
| 180 | delay = c->time_frame - curtime; |
| 181 | if (delay <= 0) |
| 182 | break; |
| 183 | av_usleep(delay); |
| 184 | } |
| 185 | |
| 186 | pkt->pts = curtime; |
| 187 | } |
| 188 | |
| 189 | #if CONFIG_LIBXCB_SHM |
| 190 | static int check_shm(xcb_connection_t *conn) |
| 191 | { |
| 192 | xcb_shm_query_version_cookie_t cookie = xcb_shm_query_version(conn); |
| 193 | xcb_shm_query_version_reply_t *reply; |
| 194 | |
| 195 | reply = xcb_shm_query_version_reply(conn, cookie, NULL); |
| 196 | if (reply) { |
| 197 | free(reply); |
| 198 | return 1; |
| 199 | } |
| 200 | |
| 201 | return 0; |
| 202 | } |
| 203 | |
| 204 | static void dealloc_shm(void *unused, uint8_t *data) |
| 205 | { |
| 206 | shmdt(data); |
| 207 | } |
| 208 | |
| 209 | static int xcbgrab_frame_shm(AVFormatContext *s, AVPacket *pkt) |
| 210 | { |
| 211 | XCBGrabContext *c = s->priv_data; |
| 212 | xcb_shm_get_image_cookie_t iq; |
| 213 | xcb_shm_get_image_reply_t *img; |
| 214 | xcb_drawable_t drawable = c->screen->root; |
| 215 | uint8_t *data; |
| 216 | int size = c->frame_size + FF_INPUT_BUFFER_PADDING_SIZE; |
| 217 | int id = shmget(IPC_PRIVATE, size, IPC_CREAT | 0777); |
| 218 | xcb_generic_error_t *e = NULL; |
| 219 | |
| 220 | if (id == -1) { |
| 221 | char errbuf[1024]; |
| 222 | int err = AVERROR(errno); |
| 223 | av_strerror(err, errbuf, sizeof(errbuf)); |
| 224 | av_log(s, AV_LOG_ERROR, "Cannot get %d bytes of shared memory: %s.\n", |
| 225 | size, errbuf); |
| 226 | return err; |
| 227 | } |
| 228 | |
| 229 | xcb_shm_attach(c->conn, c->segment, id, 0); |
| 230 | |
| 231 | iq = xcb_shm_get_image(c->conn, drawable, |
| 232 | c->x, c->y, c->width, c->height, ~0, |
| 233 | XCB_IMAGE_FORMAT_Z_PIXMAP, c->segment, 0); |
| 234 | |
| 235 | xcb_shm_detach(c->conn, c->segment); |
| 236 | |
| 237 | img = xcb_shm_get_image_reply(c->conn, iq, &e); |
| 238 | |
| 239 | xcb_flush(c->conn); |
| 240 | |
| 241 | if (e) { |
| 242 | av_log(s, AV_LOG_ERROR, |
| 243 | "Cannot get the image data " |
| 244 | "event_error: response_type:%u error_code:%u " |
| 245 | "sequence:%u resource_id:%u minor_code:%u major_code:%u.\n", |
| 246 | e->response_type, e->error_code, |
| 247 | e->sequence, e->resource_id, e->minor_code, e->major_code); |
| 248 | |
| 249 | shmctl(id, IPC_RMID, 0); |
| 250 | return AVERROR(EACCES); |
| 251 | } |
| 252 | |
| 253 | free(img); |
| 254 | |
| 255 | data = shmat(id, NULL, 0); |
| 256 | shmctl(id, IPC_RMID, 0); |
| 257 | |
| 258 | if ((intptr_t)data == -1) |
| 259 | return AVERROR(errno); |
| 260 | |
| 261 | pkt->buf = av_buffer_create(data, size, dealloc_shm, NULL, 0); |
| 262 | if (!pkt->buf) { |
| 263 | shmdt(data); |
| 264 | return AVERROR(ENOMEM); |
| 265 | } |
| 266 | |
| 267 | pkt->data = pkt->buf->data; |
| 268 | pkt->size = c->frame_size; |
| 269 | |
| 270 | return 0; |
| 271 | } |
| 272 | #endif /* CONFIG_LIBXCB_SHM */ |
| 273 | |
| 274 | #if CONFIG_LIBXCB_XFIXES |
| 275 | static int check_xfixes(xcb_connection_t *conn) |
| 276 | { |
| 277 | xcb_xfixes_query_version_cookie_t cookie; |
| 278 | xcb_xfixes_query_version_reply_t *reply; |
| 279 | |
| 280 | cookie = xcb_xfixes_query_version(conn, XCB_XFIXES_MAJOR_VERSION, |
| 281 | XCB_XFIXES_MINOR_VERSION); |
| 282 | reply = xcb_xfixes_query_version_reply(conn, cookie, NULL); |
| 283 | |
| 284 | if (reply) { |
| 285 | free(reply); |
| 286 | return 1; |
| 287 | } |
| 288 | return 0; |
| 289 | } |
| 290 | |
| 291 | #define BLEND(target, source, alpha) \ |
| 292 | (target) + ((source) * (255 - (alpha)) + 255 / 2) / 255 |
| 293 | |
| 294 | static void xcbgrab_draw_mouse(AVFormatContext *s, AVPacket *pkt, |
| 295 | xcb_query_pointer_reply_t *p, |
| 296 | xcb_get_geometry_reply_t *geo) |
| 297 | { |
| 298 | XCBGrabContext *gr = s->priv_data; |
| 299 | uint32_t *cursor; |
| 300 | uint8_t *image = pkt->data; |
| 301 | int stride = gr->bpp / 8; |
| 302 | xcb_xfixes_get_cursor_image_cookie_t cc; |
| 303 | xcb_xfixes_get_cursor_image_reply_t *ci; |
| 304 | int cx, cy, x, y, w, h, c_off, i_off; |
| 305 | |
| 306 | cc = xcb_xfixes_get_cursor_image(gr->conn); |
| 307 | ci = xcb_xfixes_get_cursor_image_reply(gr->conn, cc, NULL); |
| 308 | if (!ci) |
| 309 | return; |
| 310 | |
| 311 | cursor = xcb_xfixes_get_cursor_image_cursor_image(ci); |
| 312 | if (!cursor) |
| 313 | return; |
| 314 | |
| 315 | cx = ci->x - ci->xhot; |
| 316 | cy = ci->y - ci->yhot; |
| 317 | |
| 318 | x = FFMAX(cx, gr->x); |
| 319 | y = FFMAX(cy, gr->y); |
| 320 | |
| 321 | w = FFMIN(cx + ci->width, gr->x + gr->width) - x; |
| 322 | h = FFMIN(cy + ci->height, gr->y + gr->height) - y; |
| 323 | |
| 324 | c_off = x - cx; |
| 325 | i_off = x - gr->x; |
| 326 | |
| 327 | cursor += (y - cy) * ci->width; |
| 328 | image += (y - gr->y) * gr->width * stride; |
| 329 | |
| 330 | for (y = 0; y < h; y++) { |
| 331 | cursor += c_off; |
| 332 | image += i_off * stride; |
| 333 | for (x = 0; x < w; x++, cursor++, image += stride) { |
| 334 | int r, g, b, a; |
| 335 | |
| 336 | r = *cursor & 0xff; |
| 337 | g = (*cursor >> 8) & 0xff; |
| 338 | b = (*cursor >> 16) & 0xff; |
| 339 | a = (*cursor >> 24) & 0xff; |
| 340 | |
| 341 | if (!a) |
| 342 | continue; |
| 343 | |
| 344 | if (a == 255) { |
| 345 | image[0] = r; |
| 346 | image[1] = g; |
| 347 | image[2] = b; |
| 348 | } else { |
| 349 | image[0] = BLEND(r, image[0], a); |
| 350 | image[1] = BLEND(g, image[1], a); |
| 351 | image[2] = BLEND(b, image[2], a); |
| 352 | } |
| 353 | |
| 354 | } |
| 355 | cursor += ci->width - w - c_off; |
| 356 | image += (gr->width - w - i_off) * stride; |
| 357 | } |
| 358 | |
| 359 | free(ci); |
| 360 | } |
| 361 | #endif /* CONFIG_LIBXCB_XFIXES */ |
| 362 | |
| 363 | static void xcbgrab_update_region(AVFormatContext *s) |
| 364 | { |
| 365 | XCBGrabContext *c = s->priv_data; |
| 366 | const uint32_t args[] = { c->x - c->region_border, |
| 367 | c->y - c->region_border }; |
| 368 | |
| 369 | xcb_configure_window(c->conn, |
| 370 | c->window, |
| 371 | XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y, |
| 372 | args); |
| 373 | } |
| 374 | |
| 375 | static int xcbgrab_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 376 | { |
| 377 | XCBGrabContext *c = s->priv_data; |
| 378 | xcb_query_pointer_cookie_t pc; |
| 379 | xcb_get_geometry_cookie_t gc; |
| 380 | xcb_query_pointer_reply_t *p = NULL; |
| 381 | xcb_get_geometry_reply_t *geo = NULL; |
| 382 | int ret = 0; |
| 383 | |
| 384 | wait_frame(s, pkt); |
| 385 | |
| 386 | if (c->follow_mouse || c->draw_mouse) { |
| 387 | pc = xcb_query_pointer(c->conn, c->screen->root); |
| 388 | gc = xcb_get_geometry(c->conn, c->screen->root); |
| 389 | p = xcb_query_pointer_reply(c->conn, pc, NULL); |
| 390 | geo = xcb_get_geometry_reply(c->conn, gc, NULL); |
| 391 | } |
| 392 | |
| 393 | if (c->follow_mouse && p->same_screen) |
| 394 | xcbgrab_reposition(s, p, geo); |
| 395 | |
| 396 | if (c->show_region) |
| 397 | xcbgrab_update_region(s); |
| 398 | |
| 399 | #if CONFIG_LIBXCB_SHM |
| 400 | if (c->has_shm && xcbgrab_frame_shm(s, pkt) < 0) |
| 401 | c->has_shm = 0; |
| 402 | #endif |
| 403 | if (!c->has_shm) |
| 404 | ret = xcbgrab_frame(s, pkt); |
| 405 | |
| 406 | #if CONFIG_LIBXCB_XFIXES |
| 407 | if (c->draw_mouse && p->same_screen) |
| 408 | xcbgrab_draw_mouse(s, pkt, p, geo); |
| 409 | #endif |
| 410 | |
| 411 | free(p); |
| 412 | free(geo); |
| 413 | |
| 414 | return ret; |
| 415 | } |
| 416 | |
| 417 | static av_cold int xcbgrab_read_close(AVFormatContext *s) |
| 418 | { |
| 419 | XCBGrabContext *ctx = s->priv_data; |
| 420 | |
| 421 | xcb_disconnect(ctx->conn); |
| 422 | |
| 423 | return 0; |
| 424 | } |
| 425 | |
| 426 | static xcb_screen_t *get_screen(const xcb_setup_t *setup, int screen_num) |
| 427 | { |
| 428 | xcb_screen_iterator_t it = xcb_setup_roots_iterator(setup); |
| 429 | xcb_screen_t *screen = NULL; |
| 430 | |
| 431 | for (; it.rem > 0; xcb_screen_next (&it)) { |
| 432 | if (!screen_num) { |
| 433 | screen = it.data; |
| 434 | break; |
| 435 | } |
| 436 | |
| 437 | screen_num--; |
| 438 | } |
| 439 | |
| 440 | return screen; |
| 441 | } |
| 442 | |
| 443 | static int pixfmt_from_pixmap_format(AVFormatContext *s, int depth, |
| 444 | int *pix_fmt) |
| 445 | { |
| 446 | XCBGrabContext *c = s->priv_data; |
| 447 | const xcb_setup_t *setup = xcb_get_setup(c->conn); |
| 448 | const xcb_format_t *fmt = xcb_setup_pixmap_formats(setup); |
| 449 | int length = xcb_setup_pixmap_formats_length(setup); |
| 450 | |
| 451 | *pix_fmt = 0; |
| 452 | |
| 453 | while (length--) { |
| 454 | if (fmt->depth == depth) { |
| 455 | switch (depth) { |
| 456 | case 32: |
| 457 | if (fmt->bits_per_pixel == 32) |
| 458 | *pix_fmt = AV_PIX_FMT_ARGB; |
| 459 | break; |
| 460 | case 24: |
| 461 | if (fmt->bits_per_pixel == 32) |
| 462 | *pix_fmt = AV_PIX_FMT_RGB32; |
| 463 | else if (fmt->bits_per_pixel == 24) |
| 464 | *pix_fmt = AV_PIX_FMT_RGB24; |
| 465 | break; |
| 466 | case 16: |
| 467 | if (fmt->bits_per_pixel == 16) |
| 468 | *pix_fmt = AV_PIX_FMT_RGB565; |
| 469 | break; |
| 470 | case 15: |
| 471 | if (fmt->bits_per_pixel == 16) |
| 472 | *pix_fmt = AV_PIX_FMT_RGB555; |
| 473 | break; |
| 474 | case 8: |
| 475 | if (fmt->bits_per_pixel == 8) |
| 476 | *pix_fmt = AV_PIX_FMT_RGB8; |
| 477 | break; |
| 478 | } |
| 479 | } |
| 480 | |
| 481 | if (*pix_fmt) { |
| 482 | c->bpp = fmt->bits_per_pixel; |
| 483 | c->frame_size = c->width * c->height * fmt->bits_per_pixel / 8; |
| 484 | return 0; |
| 485 | } |
| 486 | |
| 487 | fmt++; |
| 488 | } |
| 489 | av_log(s, AV_LOG_ERROR, "Pixmap format not mappable.\n"); |
| 490 | |
| 491 | return AVERROR_PATCHWELCOME; |
| 492 | } |
| 493 | |
| 494 | static int create_stream(AVFormatContext *s) |
| 495 | { |
| 496 | XCBGrabContext *c = s->priv_data; |
| 497 | AVStream *st = avformat_new_stream(s, NULL); |
| 498 | xcb_get_geometry_cookie_t gc; |
| 499 | xcb_get_geometry_reply_t *geo; |
| 500 | int ret; |
| 501 | |
| 502 | if (!st) |
| 503 | return AVERROR(ENOMEM); |
| 504 | |
| 505 | ret = av_parse_video_size(&c->width, &c->height, c->video_size); |
| 506 | if (ret < 0) |
| 507 | return ret; |
| 508 | |
| 509 | ret = av_parse_video_rate(&st->avg_frame_rate, c->framerate); |
| 510 | if (ret < 0) |
| 511 | return ret; |
| 512 | |
| 513 | avpriv_set_pts_info(st, 64, 1, 1000000); |
| 514 | |
| 515 | gc = xcb_get_geometry(c->conn, c->screen->root); |
| 516 | geo = xcb_get_geometry_reply(c->conn, gc, NULL); |
| 517 | |
| 518 | c->width = FFMIN(geo->width, c->width); |
| 519 | c->height = FFMIN(geo->height, c->height); |
| 520 | c->time_base = (AVRational){ st->avg_frame_rate.den, |
| 521 | st->avg_frame_rate.num }; |
| 522 | c->time_frame = av_gettime(); |
| 523 | |
| 524 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 525 | st->codec->codec_id = AV_CODEC_ID_RAWVIDEO; |
| 526 | st->codec->width = c->width; |
| 527 | st->codec->height = c->height; |
| 528 | st->codec->time_base = c->time_base; |
| 529 | |
| 530 | ret = pixfmt_from_pixmap_format(s, geo->depth, &st->codec->pix_fmt); |
| 531 | |
| 532 | free(geo); |
| 533 | |
| 534 | return ret; |
| 535 | } |
| 536 | |
| 537 | static void draw_rectangle(AVFormatContext *s) |
| 538 | { |
| 539 | XCBGrabContext *c = s->priv_data; |
| 540 | xcb_gcontext_t gc = xcb_generate_id(c->conn); |
| 541 | uint32_t mask = XCB_GC_FOREGROUND | |
| 542 | XCB_GC_BACKGROUND | |
| 543 | XCB_GC_LINE_WIDTH | |
| 544 | XCB_GC_LINE_STYLE | |
| 545 | XCB_GC_FILL_STYLE; |
| 546 | uint32_t values[] = { c->screen->black_pixel, |
| 547 | c->screen->white_pixel, |
| 548 | c->region_border, |
| 549 | XCB_LINE_STYLE_DOUBLE_DASH, |
| 550 | XCB_FILL_STYLE_SOLID }; |
| 551 | xcb_rectangle_t r = { 1, 1, |
| 552 | c->width + c->region_border * 2 - 3, |
| 553 | c->height + c->region_border * 2 - 3 }; |
| 554 | |
| 555 | xcb_create_gc(c->conn, gc, c->window, mask, values); |
| 556 | |
| 557 | xcb_poly_rectangle(c->conn, c->window, gc, 1, &r); |
| 558 | } |
| 559 | |
| 560 | static void setup_window(AVFormatContext *s) |
| 561 | { |
| 562 | XCBGrabContext *c = s->priv_data; |
| 563 | uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK; |
| 564 | uint32_t values[] = { 1, |
| 565 | XCB_EVENT_MASK_EXPOSURE | |
| 566 | XCB_EVENT_MASK_STRUCTURE_NOTIFY }; |
| 567 | xcb_rectangle_t rect = { c->x, c->y, c->width, c->height }; |
| 568 | |
| 569 | c->window = xcb_generate_id(c->conn); |
| 570 | |
| 571 | xcb_create_window(c->conn, XCB_COPY_FROM_PARENT, |
| 572 | c->window, |
| 573 | c->screen->root, |
| 574 | c->x - c->region_border, |
| 575 | c->y - c->region_border, |
| 576 | c->width + c->region_border * 2, |
| 577 | c->height + c->region_border * 2, |
| 578 | 0, |
| 579 | XCB_WINDOW_CLASS_INPUT_OUTPUT, |
| 580 | XCB_COPY_FROM_PARENT, |
| 581 | mask, values); |
| 582 | |
| 583 | #if CONFIG_LIBXCB_SHAPE |
| 584 | xcb_shape_rectangles(c->conn, XCB_SHAPE_SO_SUBTRACT, |
| 585 | XCB_SHAPE_SK_BOUNDING, XCB_CLIP_ORDERING_UNSORTED, |
| 586 | c->window, |
| 587 | c->region_border, c->region_border, |
| 588 | 1, &rect); |
| 589 | #endif |
| 590 | |
| 591 | xcb_map_window(c->conn, c->window); |
| 592 | |
| 593 | draw_rectangle(s); |
| 594 | } |
| 595 | |
| 596 | static av_cold int xcbgrab_read_header(AVFormatContext *s) |
| 597 | { |
| 598 | XCBGrabContext *c = s->priv_data; |
| 599 | int screen_num, ret; |
| 600 | const xcb_setup_t *setup; |
| 601 | char *display_name = av_strdup(s->filename); |
| 602 | |
| 603 | if (!display_name) |
| 604 | return AVERROR(ENOMEM); |
| 605 | |
| 606 | if (!sscanf(s->filename, "%[^+]+%d,%d", display_name, &c->x, &c->y)) { |
| 607 | *display_name = 0; |
| 608 | sscanf(s->filename, "+%d,%d", &c->x, &c->y); |
| 609 | } |
| 610 | |
| 611 | c->conn = xcb_connect(display_name, &screen_num); |
| 612 | av_freep(&display_name); |
| 613 | if ((ret = xcb_connection_has_error(c->conn))) { |
| 614 | av_log(s, AV_LOG_ERROR, "Cannot open display %s, error %d.\n", |
| 615 | (*s->filename) ? s->filename : "default", ret); |
| 616 | return AVERROR(EIO); |
| 617 | } |
| 618 | setup = xcb_get_setup(c->conn); |
| 619 | |
| 620 | c->screen = get_screen(setup, screen_num); |
| 621 | if (!c->screen) { |
| 622 | av_log(s, AV_LOG_ERROR, "The screen %d does not exist.\n", |
| 623 | screen_num); |
| 624 | xcbgrab_read_close(s); |
| 625 | return AVERROR(EIO); |
| 626 | } |
| 627 | |
| 628 | #if CONFIG_LIBXCB_SHM |
| 629 | c->segment = xcb_generate_id(c->conn); |
| 630 | #endif |
| 631 | |
| 632 | ret = create_stream(s); |
| 633 | |
| 634 | if (ret < 0) { |
| 635 | xcbgrab_read_close(s); |
| 636 | return ret; |
| 637 | } |
| 638 | |
| 639 | #if CONFIG_LIBXCB_SHM |
| 640 | c->has_shm = check_shm(c->conn); |
| 641 | #endif |
| 642 | |
| 643 | #if CONFIG_LIBXCB_XFIXES |
| 644 | if (c->draw_mouse) { |
| 645 | if (!(c->draw_mouse = check_xfixes(c->conn))) { |
| 646 | av_log(s, AV_LOG_WARNING, |
| 647 | "XFixes not available, cannot draw the mouse.\n"); |
| 648 | } |
| 649 | if (c->bpp < 24) { |
| 650 | avpriv_report_missing_feature(s, "%d bits per pixel screen", |
| 651 | c->bpp); |
| 652 | c->draw_mouse = 0; |
| 653 | } |
| 654 | } |
| 655 | #endif |
| 656 | |
| 657 | if (c->show_region) |
| 658 | setup_window(s); |
| 659 | |
| 660 | return 0; |
| 661 | } |
| 662 | |
| 663 | AVInputFormat ff_x11grab_xcb_demuxer = { |
| 664 | .name = "x11grab", |
| 665 | .long_name = NULL_IF_CONFIG_SMALL("X11 screen capture, using XCB"), |
| 666 | .priv_data_size = sizeof(XCBGrabContext), |
| 667 | .read_header = xcbgrab_read_header, |
| 668 | .read_packet = xcbgrab_read_packet, |
| 669 | .read_close = xcbgrab_read_close, |
| 670 | .flags = AVFMT_NOFILE, |
| 671 | .priv_class = &xcbgrab_class, |
| 672 | }; |