| 1 | /* |
| 2 | * GDI video grab interface |
| 3 | * |
| 4 | * This file is part of FFmpeg. |
| 5 | * |
| 6 | * Copyright (C) 2013 Calvin Walton <calvin.walton@kepstin.ca> |
| 7 | * Copyright (C) 2007-2010 Christophe Gisquet <word1.word2@gmail.com> |
| 8 | * |
| 9 | * FFmpeg is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU Lesser General Public License |
| 11 | * as published by the Free Software Foundation; either version 2.1 |
| 12 | * of the License, or (at your option) any later version. |
| 13 | * |
| 14 | * FFmpeg is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU Lesser General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Lesser General Public |
| 20 | * License along with FFmpeg; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 22 | */ |
| 23 | |
| 24 | /** |
| 25 | * @file |
| 26 | * GDI frame device demuxer |
| 27 | * @author Calvin Walton <calvin.walton@kepstin.ca> |
| 28 | * @author Christophe Gisquet <word1.word2@gmail.com> |
| 29 | */ |
| 30 | |
| 31 | #include "config.h" |
| 32 | #include "libavformat/internal.h" |
| 33 | #include "libavutil/opt.h" |
| 34 | #include "libavutil/time.h" |
| 35 | #include <windows.h> |
| 36 | |
| 37 | /** |
| 38 | * GDI Device Demuxer context |
| 39 | */ |
| 40 | struct gdigrab { |
| 41 | const AVClass *class; /**< Class for private options */ |
| 42 | |
| 43 | int frame_size; /**< Size in bytes of the frame pixel data */ |
| 44 | int header_size; /**< Size in bytes of the DIB header */ |
| 45 | AVRational time_base; /**< Time base */ |
| 46 | int64_t time_frame; /**< Current time */ |
| 47 | |
| 48 | int draw_mouse; /**< Draw mouse cursor (private option) */ |
| 49 | int show_region; /**< Draw border (private option) */ |
| 50 | AVRational framerate; /**< Capture framerate (private option) */ |
| 51 | int width; /**< Width of the grab frame (private option) */ |
| 52 | int height; /**< Height of the grab frame (private option) */ |
| 53 | int offset_x; /**< Capture x offset (private option) */ |
| 54 | int offset_y; /**< Capture y offset (private option) */ |
| 55 | |
| 56 | HWND hwnd; /**< Handle of the window for the grab */ |
| 57 | HDC source_hdc; /**< Source device context */ |
| 58 | HDC dest_hdc; /**< Destination, source-compatible DC */ |
| 59 | BITMAPINFO bmi; /**< Information describing DIB format */ |
| 60 | HBITMAP hbmp; /**< Information on the bitmap captured */ |
| 61 | void *buffer; /**< The buffer containing the bitmap image data */ |
| 62 | RECT clip_rect; /**< The subarea of the screen or window to clip */ |
| 63 | |
| 64 | HWND region_hwnd; /**< Handle of the region border window */ |
| 65 | |
| 66 | int cursor_error_printed; |
| 67 | }; |
| 68 | |
| 69 | #define WIN32_API_ERROR(str) \ |
| 70 | av_log(s1, AV_LOG_ERROR, str " (error %li)\n", GetLastError()) |
| 71 | |
| 72 | #define REGION_WND_BORDER 3 |
| 73 | |
| 74 | /** |
| 75 | * Callback to handle Windows messages for the region outline window. |
| 76 | * |
| 77 | * In particular, this handles painting the frame rectangle. |
| 78 | * |
| 79 | * @param hwnd The region outline window handle. |
| 80 | * @param msg The Windows message. |
| 81 | * @param wparam First Windows message parameter. |
| 82 | * @param lparam Second Windows message parameter. |
| 83 | * @return 0 success, !0 failure |
| 84 | */ |
| 85 | static LRESULT CALLBACK |
| 86 | gdigrab_region_wnd_proc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam) |
| 87 | { |
| 88 | PAINTSTRUCT ps; |
| 89 | HDC hdc; |
| 90 | RECT rect; |
| 91 | |
| 92 | switch (msg) { |
| 93 | case WM_PAINT: |
| 94 | hdc = BeginPaint(hwnd, &ps); |
| 95 | |
| 96 | GetClientRect(hwnd, &rect); |
| 97 | FrameRect(hdc, &rect, GetStockObject(BLACK_BRUSH)); |
| 98 | |
| 99 | rect.left++; rect.top++; rect.right--; rect.bottom--; |
| 100 | FrameRect(hdc, &rect, GetStockObject(WHITE_BRUSH)); |
| 101 | |
| 102 | rect.left++; rect.top++; rect.right--; rect.bottom--; |
| 103 | FrameRect(hdc, &rect, GetStockObject(BLACK_BRUSH)); |
| 104 | |
| 105 | EndPaint(hwnd, &ps); |
| 106 | break; |
| 107 | default: |
| 108 | return DefWindowProc(hwnd, msg, wparam, lparam); |
| 109 | } |
| 110 | return 0; |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * Initialize the region outline window. |
| 115 | * |
| 116 | * @param s1 The format context. |
| 117 | * @param gdigrab gdigrab context. |
| 118 | * @return 0 success, !0 failure |
| 119 | */ |
| 120 | static int |
| 121 | gdigrab_region_wnd_init(AVFormatContext *s1, struct gdigrab *gdigrab) |
| 122 | { |
| 123 | HWND hwnd; |
| 124 | RECT rect = gdigrab->clip_rect; |
| 125 | HRGN region = NULL; |
| 126 | HRGN region_interior = NULL; |
| 127 | |
| 128 | DWORD style = WS_POPUP | WS_VISIBLE; |
| 129 | DWORD ex = WS_EX_TOOLWINDOW | WS_EX_TOPMOST | WS_EX_TRANSPARENT; |
| 130 | |
| 131 | rect.left -= REGION_WND_BORDER; rect.top -= REGION_WND_BORDER; |
| 132 | rect.right += REGION_WND_BORDER; rect.bottom += REGION_WND_BORDER; |
| 133 | |
| 134 | AdjustWindowRectEx(&rect, style, FALSE, ex); |
| 135 | |
| 136 | // Create a window with no owner; use WC_DIALOG instead of writing a custom |
| 137 | // window class |
| 138 | hwnd = CreateWindowEx(ex, WC_DIALOG, NULL, style, rect.left, rect.top, |
| 139 | rect.right - rect.left, rect.bottom - rect.top, |
| 140 | NULL, NULL, NULL, NULL); |
| 141 | if (!hwnd) { |
| 142 | WIN32_API_ERROR("Could not create region display window"); |
| 143 | goto error; |
| 144 | } |
| 145 | |
| 146 | // Set the window shape to only include the border area |
| 147 | GetClientRect(hwnd, &rect); |
| 148 | region = CreateRectRgn(0, 0, |
| 149 | rect.right - rect.left, rect.bottom - rect.top); |
| 150 | region_interior = CreateRectRgn(REGION_WND_BORDER, REGION_WND_BORDER, |
| 151 | rect.right - rect.left - REGION_WND_BORDER, |
| 152 | rect.bottom - rect.top - REGION_WND_BORDER); |
| 153 | CombineRgn(region, region, region_interior, RGN_DIFF); |
| 154 | if (!SetWindowRgn(hwnd, region, FALSE)) { |
| 155 | WIN32_API_ERROR("Could not set window region"); |
| 156 | goto error; |
| 157 | } |
| 158 | // The "region" memory is now owned by the window |
| 159 | region = NULL; |
| 160 | DeleteObject(region_interior); |
| 161 | |
| 162 | SetWindowLongPtr(hwnd, GWLP_WNDPROC, (LONG_PTR) gdigrab_region_wnd_proc); |
| 163 | |
| 164 | ShowWindow(hwnd, SW_SHOW); |
| 165 | |
| 166 | gdigrab->region_hwnd = hwnd; |
| 167 | |
| 168 | return 0; |
| 169 | |
| 170 | error: |
| 171 | if (region) |
| 172 | DeleteObject(region); |
| 173 | if (region_interior) |
| 174 | DeleteObject(region_interior); |
| 175 | if (hwnd) |
| 176 | DestroyWindow(hwnd); |
| 177 | return 1; |
| 178 | } |
| 179 | |
| 180 | /** |
| 181 | * Cleanup/free the region outline window. |
| 182 | * |
| 183 | * @param s1 The format context. |
| 184 | * @param gdigrab gdigrab context. |
| 185 | */ |
| 186 | static void |
| 187 | gdigrab_region_wnd_destroy(AVFormatContext *s1, struct gdigrab *gdigrab) |
| 188 | { |
| 189 | if (gdigrab->region_hwnd) |
| 190 | DestroyWindow(gdigrab->region_hwnd); |
| 191 | gdigrab->region_hwnd = NULL; |
| 192 | } |
| 193 | |
| 194 | /** |
| 195 | * Process the Windows message queue. |
| 196 | * |
| 197 | * This is important to prevent Windows from thinking the window has become |
| 198 | * unresponsive. As well, things like WM_PAINT (to actually draw the window |
| 199 | * contents) are handled from the message queue context. |
| 200 | * |
| 201 | * @param s1 The format context. |
| 202 | * @param gdigrab gdigrab context. |
| 203 | */ |
| 204 | static void |
| 205 | gdigrab_region_wnd_update(AVFormatContext *s1, struct gdigrab *gdigrab) |
| 206 | { |
| 207 | HWND hwnd = gdigrab->region_hwnd; |
| 208 | MSG msg; |
| 209 | |
| 210 | while (PeekMessage(&msg, hwnd, 0, 0, PM_REMOVE)) { |
| 211 | DispatchMessage(&msg); |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | /** |
| 216 | * Initializes the gdi grab device demuxer (public device demuxer API). |
| 217 | * |
| 218 | * @param s1 Context from avformat core |
| 219 | * @return AVERROR_IO error, 0 success |
| 220 | */ |
| 221 | static int |
| 222 | gdigrab_read_header(AVFormatContext *s1) |
| 223 | { |
| 224 | struct gdigrab *gdigrab = s1->priv_data; |
| 225 | |
| 226 | HWND hwnd; |
| 227 | HDC source_hdc = NULL; |
| 228 | HDC dest_hdc = NULL; |
| 229 | BITMAPINFO bmi; |
| 230 | HBITMAP hbmp = NULL; |
| 231 | void *buffer = NULL; |
| 232 | |
| 233 | const char *filename = s1->filename; |
| 234 | const char *name = NULL; |
| 235 | AVStream *st = NULL; |
| 236 | |
| 237 | int bpp; |
| 238 | RECT virtual_rect; |
| 239 | RECT clip_rect; |
| 240 | BITMAP bmp; |
| 241 | int ret; |
| 242 | |
| 243 | if (!strncmp(filename, "title=", 6)) { |
| 244 | name = filename + 6; |
| 245 | hwnd = FindWindow(NULL, name); |
| 246 | if (!hwnd) { |
| 247 | av_log(s1, AV_LOG_ERROR, |
| 248 | "Can't find window '%s', aborting.\n", name); |
| 249 | ret = AVERROR(EIO); |
| 250 | goto error; |
| 251 | } |
| 252 | if (gdigrab->show_region) { |
| 253 | av_log(s1, AV_LOG_WARNING, |
| 254 | "Can't show region when grabbing a window.\n"); |
| 255 | gdigrab->show_region = 0; |
| 256 | } |
| 257 | } else if (!strcmp(filename, "desktop")) { |
| 258 | hwnd = NULL; |
| 259 | } else { |
| 260 | av_log(s1, AV_LOG_ERROR, |
| 261 | "Please use \"desktop\" or \"title=<windowname>\" to specify your target.\n"); |
| 262 | ret = AVERROR(EIO); |
| 263 | goto error; |
| 264 | } |
| 265 | |
| 266 | if (hwnd) { |
| 267 | GetClientRect(hwnd, &virtual_rect); |
| 268 | } else { |
| 269 | virtual_rect.left = GetSystemMetrics(SM_XVIRTUALSCREEN); |
| 270 | virtual_rect.top = GetSystemMetrics(SM_YVIRTUALSCREEN); |
| 271 | virtual_rect.right = virtual_rect.left + GetSystemMetrics(SM_CXVIRTUALSCREEN); |
| 272 | virtual_rect.bottom = virtual_rect.top + GetSystemMetrics(SM_CYVIRTUALSCREEN); |
| 273 | } |
| 274 | |
| 275 | /* If no width or height set, use full screen/window area */ |
| 276 | if (!gdigrab->width || !gdigrab->height) { |
| 277 | clip_rect.left = virtual_rect.left; |
| 278 | clip_rect.top = virtual_rect.top; |
| 279 | clip_rect.right = virtual_rect.right; |
| 280 | clip_rect.bottom = virtual_rect.bottom; |
| 281 | } else { |
| 282 | clip_rect.left = gdigrab->offset_x; |
| 283 | clip_rect.top = gdigrab->offset_y; |
| 284 | clip_rect.right = gdigrab->width + gdigrab->offset_x; |
| 285 | clip_rect.bottom = gdigrab->height + gdigrab->offset_y; |
| 286 | } |
| 287 | |
| 288 | if (clip_rect.left < virtual_rect.left || |
| 289 | clip_rect.top < virtual_rect.top || |
| 290 | clip_rect.right > virtual_rect.right || |
| 291 | clip_rect.bottom > virtual_rect.bottom) { |
| 292 | av_log(s1, AV_LOG_ERROR, |
| 293 | "Capture area (%li,%li),(%li,%li) extends outside window area (%li,%li),(%li,%li)", |
| 294 | clip_rect.left, clip_rect.top, |
| 295 | clip_rect.right, clip_rect.bottom, |
| 296 | virtual_rect.left, virtual_rect.top, |
| 297 | virtual_rect.right, virtual_rect.bottom); |
| 298 | ret = AVERROR(EIO); |
| 299 | goto error; |
| 300 | } |
| 301 | |
| 302 | /* This will get the device context for the selected window, or if |
| 303 | * none, the primary screen */ |
| 304 | source_hdc = GetDC(hwnd); |
| 305 | if (!source_hdc) { |
| 306 | WIN32_API_ERROR("Couldn't get window device context"); |
| 307 | ret = AVERROR(EIO); |
| 308 | goto error; |
| 309 | } |
| 310 | bpp = GetDeviceCaps(source_hdc, BITSPIXEL); |
| 311 | |
| 312 | if (name) { |
| 313 | av_log(s1, AV_LOG_INFO, |
| 314 | "Found window %s, capturing %lix%lix%i at (%li,%li)\n", |
| 315 | name, |
| 316 | clip_rect.right - clip_rect.left, |
| 317 | clip_rect.bottom - clip_rect.top, |
| 318 | bpp, clip_rect.left, clip_rect.top); |
| 319 | } else { |
| 320 | av_log(s1, AV_LOG_INFO, |
| 321 | "Capturing whole desktop as %lix%lix%i at (%li,%li)\n", |
| 322 | clip_rect.right - clip_rect.left, |
| 323 | clip_rect.bottom - clip_rect.top, |
| 324 | bpp, clip_rect.left, clip_rect.top); |
| 325 | } |
| 326 | |
| 327 | if (clip_rect.right - clip_rect.left <= 0 || |
| 328 | clip_rect.bottom - clip_rect.top <= 0 || bpp%8) { |
| 329 | av_log(s1, AV_LOG_ERROR, "Invalid properties, aborting\n"); |
| 330 | ret = AVERROR(EIO); |
| 331 | goto error; |
| 332 | } |
| 333 | |
| 334 | dest_hdc = CreateCompatibleDC(source_hdc); |
| 335 | if (!dest_hdc) { |
| 336 | WIN32_API_ERROR("Screen DC CreateCompatibleDC"); |
| 337 | ret = AVERROR(EIO); |
| 338 | goto error; |
| 339 | } |
| 340 | |
| 341 | /* Create a DIB and select it into the dest_hdc */ |
| 342 | bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER); |
| 343 | bmi.bmiHeader.biWidth = clip_rect.right - clip_rect.left; |
| 344 | bmi.bmiHeader.biHeight = -(clip_rect.bottom - clip_rect.top); |
| 345 | bmi.bmiHeader.biPlanes = 1; |
| 346 | bmi.bmiHeader.biBitCount = bpp; |
| 347 | bmi.bmiHeader.biCompression = BI_RGB; |
| 348 | bmi.bmiHeader.biSizeImage = 0; |
| 349 | bmi.bmiHeader.biXPelsPerMeter = 0; |
| 350 | bmi.bmiHeader.biYPelsPerMeter = 0; |
| 351 | bmi.bmiHeader.biClrUsed = 0; |
| 352 | bmi.bmiHeader.biClrImportant = 0; |
| 353 | hbmp = CreateDIBSection(dest_hdc, &bmi, DIB_RGB_COLORS, |
| 354 | &buffer, NULL, 0); |
| 355 | if (!hbmp) { |
| 356 | WIN32_API_ERROR("Creating DIB Section"); |
| 357 | ret = AVERROR(EIO); |
| 358 | goto error; |
| 359 | } |
| 360 | |
| 361 | if (!SelectObject(dest_hdc, hbmp)) { |
| 362 | WIN32_API_ERROR("SelectObject"); |
| 363 | ret = AVERROR(EIO); |
| 364 | goto error; |
| 365 | } |
| 366 | |
| 367 | /* Get info from the bitmap */ |
| 368 | GetObject(hbmp, sizeof(BITMAP), &bmp); |
| 369 | |
| 370 | st = avformat_new_stream(s1, NULL); |
| 371 | if (!st) { |
| 372 | ret = AVERROR(ENOMEM); |
| 373 | goto error; |
| 374 | } |
| 375 | avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */ |
| 376 | |
| 377 | gdigrab->frame_size = bmp.bmWidthBytes * bmp.bmHeight * bmp.bmPlanes; |
| 378 | gdigrab->header_size = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + |
| 379 | (bpp <= 8 ? (1 << bpp) : 0) * sizeof(RGBQUAD) /* palette size */; |
| 380 | gdigrab->time_base = av_inv_q(gdigrab->framerate); |
| 381 | gdigrab->time_frame = av_gettime() / av_q2d(gdigrab->time_base); |
| 382 | |
| 383 | gdigrab->hwnd = hwnd; |
| 384 | gdigrab->source_hdc = source_hdc; |
| 385 | gdigrab->dest_hdc = dest_hdc; |
| 386 | gdigrab->hbmp = hbmp; |
| 387 | gdigrab->bmi = bmi; |
| 388 | gdigrab->buffer = buffer; |
| 389 | gdigrab->clip_rect = clip_rect; |
| 390 | |
| 391 | gdigrab->cursor_error_printed = 0; |
| 392 | |
| 393 | if (gdigrab->show_region) { |
| 394 | if (gdigrab_region_wnd_init(s1, gdigrab)) { |
| 395 | ret = AVERROR(EIO); |
| 396 | goto error; |
| 397 | } |
| 398 | } |
| 399 | |
| 400 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 401 | st->codec->codec_id = AV_CODEC_ID_BMP; |
| 402 | st->codec->time_base = gdigrab->time_base; |
| 403 | st->codec->bit_rate = (gdigrab->header_size + gdigrab->frame_size) * 1/av_q2d(gdigrab->time_base) * 8; |
| 404 | |
| 405 | return 0; |
| 406 | |
| 407 | error: |
| 408 | if (source_hdc) |
| 409 | ReleaseDC(hwnd, source_hdc); |
| 410 | if (dest_hdc) |
| 411 | DeleteDC(dest_hdc); |
| 412 | if (hbmp) |
| 413 | DeleteObject(hbmp); |
| 414 | if (source_hdc) |
| 415 | DeleteDC(source_hdc); |
| 416 | return ret; |
| 417 | } |
| 418 | |
| 419 | /** |
| 420 | * Paints a mouse pointer in a Win32 image. |
| 421 | * |
| 422 | * @param s1 Context of the log information |
| 423 | * @param s Current grad structure |
| 424 | */ |
| 425 | static void paint_mouse_pointer(AVFormatContext *s1, struct gdigrab *gdigrab) |
| 426 | { |
| 427 | CURSORINFO ci = {0}; |
| 428 | |
| 429 | #define CURSOR_ERROR(str) \ |
| 430 | if (!gdigrab->cursor_error_printed) { \ |
| 431 | WIN32_API_ERROR(str); \ |
| 432 | gdigrab->cursor_error_printed = 1; \ |
| 433 | } |
| 434 | |
| 435 | ci.cbSize = sizeof(ci); |
| 436 | |
| 437 | if (GetCursorInfo(&ci)) { |
| 438 | HCURSOR icon = CopyCursor(ci.hCursor); |
| 439 | ICONINFO info; |
| 440 | POINT pos; |
| 441 | RECT clip_rect = gdigrab->clip_rect; |
| 442 | HWND hwnd = gdigrab->hwnd; |
| 443 | info.hbmMask = NULL; |
| 444 | info.hbmColor = NULL; |
| 445 | |
| 446 | if (ci.flags != CURSOR_SHOWING) |
| 447 | return; |
| 448 | |
| 449 | if (!icon) { |
| 450 | /* Use the standard arrow cursor as a fallback. |
| 451 | * You'll probably only hit this in Wine, which can't fetch |
| 452 | * the current system cursor. */ |
| 453 | icon = CopyCursor(LoadCursor(NULL, IDC_ARROW)); |
| 454 | } |
| 455 | |
| 456 | if (!GetIconInfo(icon, &info)) { |
| 457 | CURSOR_ERROR("Could not get icon info"); |
| 458 | goto icon_error; |
| 459 | } |
| 460 | |
| 461 | pos.x = ci.ptScreenPos.x - clip_rect.left - info.xHotspot; |
| 462 | pos.y = ci.ptScreenPos.y - clip_rect.top - info.yHotspot; |
| 463 | |
| 464 | if (hwnd) { |
| 465 | RECT rect; |
| 466 | |
| 467 | if (GetWindowRect(hwnd, &rect)) { |
| 468 | pos.x -= rect.left; |
| 469 | pos.y -= rect.top; |
| 470 | } else { |
| 471 | CURSOR_ERROR("Couldn't get window rectangle"); |
| 472 | goto icon_error; |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | av_log(s1, AV_LOG_DEBUG, "Cursor pos (%li,%li) -> (%li,%li)\n", |
| 477 | ci.ptScreenPos.x, ci.ptScreenPos.y, pos.x, pos.y); |
| 478 | |
| 479 | if (pos.x >= 0 && pos.x <= clip_rect.right - clip_rect.left && |
| 480 | pos.y >= 0 && pos.y <= clip_rect.bottom - clip_rect.top) { |
| 481 | if (!DrawIcon(gdigrab->dest_hdc, pos.x, pos.y, icon)) |
| 482 | CURSOR_ERROR("Couldn't draw icon"); |
| 483 | } |
| 484 | |
| 485 | icon_error: |
| 486 | if (info.hbmMask) |
| 487 | DeleteObject(info.hbmMask); |
| 488 | if (info.hbmColor) |
| 489 | DeleteObject(info.hbmColor); |
| 490 | if (icon) |
| 491 | DestroyCursor(icon); |
| 492 | } else { |
| 493 | CURSOR_ERROR("Couldn't get cursor info"); |
| 494 | } |
| 495 | } |
| 496 | |
| 497 | /** |
| 498 | * Grabs a frame from gdi (public device demuxer API). |
| 499 | * |
| 500 | * @param s1 Context from avformat core |
| 501 | * @param pkt Packet holding the grabbed frame |
| 502 | * @return frame size in bytes |
| 503 | */ |
| 504 | static int gdigrab_read_packet(AVFormatContext *s1, AVPacket *pkt) |
| 505 | { |
| 506 | struct gdigrab *gdigrab = s1->priv_data; |
| 507 | |
| 508 | HDC dest_hdc = gdigrab->dest_hdc; |
| 509 | HDC source_hdc = gdigrab->source_hdc; |
| 510 | RECT clip_rect = gdigrab->clip_rect; |
| 511 | AVRational time_base = gdigrab->time_base; |
| 512 | int64_t time_frame = gdigrab->time_frame; |
| 513 | |
| 514 | BITMAPFILEHEADER bfh; |
| 515 | int file_size = gdigrab->header_size + gdigrab->frame_size; |
| 516 | |
| 517 | int64_t curtime, delay; |
| 518 | |
| 519 | /* Calculate the time of the next frame */ |
| 520 | time_frame += INT64_C(1000000); |
| 521 | |
| 522 | /* Run Window message processing queue */ |
| 523 | if (gdigrab->show_region) |
| 524 | gdigrab_region_wnd_update(s1, gdigrab); |
| 525 | |
| 526 | /* wait based on the frame rate */ |
| 527 | for (;;) { |
| 528 | curtime = av_gettime(); |
| 529 | delay = time_frame * av_q2d(time_base) - curtime; |
| 530 | if (delay <= 0) { |
| 531 | if (delay < INT64_C(-1000000) * av_q2d(time_base)) { |
| 532 | time_frame += INT64_C(1000000); |
| 533 | } |
| 534 | break; |
| 535 | } |
| 536 | if (s1->flags & AVFMT_FLAG_NONBLOCK) { |
| 537 | return AVERROR(EAGAIN); |
| 538 | } else { |
| 539 | av_usleep(delay); |
| 540 | } |
| 541 | } |
| 542 | |
| 543 | if (av_new_packet(pkt, file_size) < 0) |
| 544 | return AVERROR(ENOMEM); |
| 545 | pkt->pts = curtime; |
| 546 | |
| 547 | /* Blit screen grab */ |
| 548 | if (!BitBlt(dest_hdc, 0, 0, |
| 549 | clip_rect.right - clip_rect.left, |
| 550 | clip_rect.bottom - clip_rect.top, |
| 551 | source_hdc, |
| 552 | clip_rect.left, clip_rect.top, SRCCOPY | CAPTUREBLT)) { |
| 553 | WIN32_API_ERROR("Failed to capture image"); |
| 554 | return AVERROR(EIO); |
| 555 | } |
| 556 | if (gdigrab->draw_mouse) |
| 557 | paint_mouse_pointer(s1, gdigrab); |
| 558 | |
| 559 | /* Copy bits to packet data */ |
| 560 | |
| 561 | bfh.bfType = 0x4d42; /* "BM" in little-endian */ |
| 562 | bfh.bfSize = file_size; |
| 563 | bfh.bfReserved1 = 0; |
| 564 | bfh.bfReserved2 = 0; |
| 565 | bfh.bfOffBits = gdigrab->header_size; |
| 566 | |
| 567 | memcpy(pkt->data, &bfh, sizeof(bfh)); |
| 568 | |
| 569 | memcpy(pkt->data + sizeof(bfh), &gdigrab->bmi.bmiHeader, sizeof(gdigrab->bmi.bmiHeader)); |
| 570 | |
| 571 | if (gdigrab->bmi.bmiHeader.biBitCount <= 8) |
| 572 | GetDIBColorTable(dest_hdc, 0, 1 << gdigrab->bmi.bmiHeader.biBitCount, |
| 573 | (RGBQUAD *) (pkt->data + sizeof(bfh) + sizeof(gdigrab->bmi.bmiHeader))); |
| 574 | |
| 575 | memcpy(pkt->data + gdigrab->header_size, gdigrab->buffer, gdigrab->frame_size); |
| 576 | |
| 577 | gdigrab->time_frame = time_frame; |
| 578 | |
| 579 | return gdigrab->header_size + gdigrab->frame_size; |
| 580 | } |
| 581 | |
| 582 | /** |
| 583 | * Closes gdi frame grabber (public device demuxer API). |
| 584 | * |
| 585 | * @param s1 Context from avformat core |
| 586 | * @return 0 success, !0 failure |
| 587 | */ |
| 588 | static int gdigrab_read_close(AVFormatContext *s1) |
| 589 | { |
| 590 | struct gdigrab *s = s1->priv_data; |
| 591 | |
| 592 | if (s->show_region) |
| 593 | gdigrab_region_wnd_destroy(s1, s); |
| 594 | |
| 595 | if (s->source_hdc) |
| 596 | ReleaseDC(s->hwnd, s->source_hdc); |
| 597 | if (s->dest_hdc) |
| 598 | DeleteDC(s->dest_hdc); |
| 599 | if (s->hbmp) |
| 600 | DeleteObject(s->hbmp); |
| 601 | if (s->source_hdc) |
| 602 | DeleteDC(s->source_hdc); |
| 603 | |
| 604 | return 0; |
| 605 | } |
| 606 | |
| 607 | #define OFFSET(x) offsetof(struct gdigrab, x) |
| 608 | #define DEC AV_OPT_FLAG_DECODING_PARAM |
| 609 | static const AVOption options[] = { |
| 610 | { "draw_mouse", "draw the mouse pointer", OFFSET(draw_mouse), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, DEC }, |
| 611 | { "show_region", "draw border around capture area", OFFSET(show_region), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC }, |
| 612 | { "framerate", "set video frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "ntsc"}, 0, 0, DEC }, |
| 613 | { "video_size", "set video frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC }, |
| 614 | { "offset_x", "capture area x offset", OFFSET(offset_x), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC }, |
| 615 | { "offset_y", "capture area y offset", OFFSET(offset_y), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC }, |
| 616 | { NULL }, |
| 617 | }; |
| 618 | |
| 619 | static const AVClass gdigrab_class = { |
| 620 | .class_name = "GDIgrab indev", |
| 621 | .item_name = av_default_item_name, |
| 622 | .option = options, |
| 623 | .version = LIBAVUTIL_VERSION_INT, |
| 624 | }; |
| 625 | |
| 626 | /** gdi grabber device demuxer declaration */ |
| 627 | AVInputFormat ff_gdigrab_demuxer = { |
| 628 | .name = "gdigrab", |
| 629 | .long_name = NULL_IF_CONFIG_SMALL("GDI API Windows frame grabber"), |
| 630 | .priv_data_size = sizeof(struct gdigrab), |
| 631 | .read_header = gdigrab_read_header, |
| 632 | .read_packet = gdigrab_read_packet, |
| 633 | .read_close = gdigrab_read_close, |
| 634 | .flags = AVFMT_NOFILE, |
| 635 | .priv_class = &gdigrab_class, |
| 636 | }; |