FFmpeg: libavdevice/gdigrab.c Source File

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libavdevice

gdigrab.c

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1 /*

2 * GDI video grab interface

3 *

4 * This file is part of FFmpeg.

5 *

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 */

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 */

31 #include "config.h"

32 #include "libavformat/internal.h"

33 #include "libavutil/opt.h"

34 #include "libavutil/time.h"

35 #include <windows.h>

37 /**

38 * GDI Device Demuxer context

39 */

40 struct gdigrab {

41 const AVClass *class; /**< Class for private options */

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 */

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) */

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 */

64 HWND region_hwnd; /**< Handle of the region border window */

66 int cursor_error_printed;

67 };

69 #define WIN32_API_ERROR(str) \

70 av_log(s1, AV_LOG_ERROR, str " (error %li)\n", GetLastError())

72 #define REGION_WND_BORDER 3

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;

92 switch (msg) {

93 case WM_PAINT:

94 hdc = BeginPaint(hwnd, &ps);

96 GetClientRect(hwnd, &rect);

97 FrameRect(hdc, &rect, GetStockObject(BLACK_BRUSH));

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->url;

234 const char *name = NULL;

235 AVStream *st = NULL;

236

237 int bpp;

238 int horzres;

239 int vertres;

240 int desktophorzres;

241 int desktopvertres;

242 RECT virtual_rect;

243 RECT clip_rect;

244 BITMAP bmp;

245 int ret;

246

247 if (!strncmp(filename, "title=", 6)) {

248 name = filename + 6;

249 hwnd = FindWindow(NULL, name);

250 if (!hwnd) {

251 av_log(s1, AV_LOG_ERROR,

252 "Can't find window '%s', aborting.\n", name);

253 ret = AVERROR(EIO);

254 goto error;

255 }

256 if (gdigrab->show_region) {

257 av_log(s1, AV_LOG_WARNING,

258 "Can't show region when grabbing a window.\n");

259 gdigrab->show_region = 0;

260 }

261 } else if (!strcmp(filename, "desktop")) {

262 hwnd = NULL;

263 } else {

264 av_log(s1, AV_LOG_ERROR,

265 "Please use \"desktop\" or \"title=<windowname>\" to specify your target.\n");

266 ret = AVERROR(EIO);

267 goto error;

268 }

269

270 /* This will get the device context for the selected window, or if

271 * none, the primary screen */

272 source_hdc = GetDC(hwnd);

273 if (!source_hdc) {

274 WIN32_API_ERROR("Couldn't get window device context");

275 ret = AVERROR(EIO);

276 goto error;

277 }

278 bpp = GetDeviceCaps(source_hdc, BITSPIXEL);

279

280 if (hwnd) {

281 GetClientRect(hwnd, &virtual_rect);

282 } else {

283 /* desktop -- get the right height and width for scaling DPI */

284 horzres = GetDeviceCaps(source_hdc, HORZRES);

285 vertres = GetDeviceCaps(source_hdc, VERTRES);

286 desktophorzres = GetDeviceCaps(source_hdc, DESKTOPHORZRES);

287 desktopvertres = GetDeviceCaps(source_hdc, DESKTOPVERTRES);

288 virtual_rect.left = GetSystemMetrics(SM_XVIRTUALSCREEN);

289 virtual_rect.top = GetSystemMetrics(SM_YVIRTUALSCREEN);

290 virtual_rect.right = (virtual_rect.left + GetSystemMetrics(SM_CXVIRTUALSCREEN)) * desktophorzres / horzres;

291 virtual_rect.bottom = (virtual_rect.top + GetSystemMetrics(SM_CYVIRTUALSCREEN)) * desktopvertres / vertres;

292 }

293

294 /* If no width or height set, use full screen/window area */

295 if (!gdigrab->width || !gdigrab->height) {

296 clip_rect.left = virtual_rect.left;

297 clip_rect.top = virtual_rect.top;

298 clip_rect.right = virtual_rect.right;

299 clip_rect.bottom = virtual_rect.bottom;

300 } else {

301 clip_rect.left = gdigrab->offset_x;

302 clip_rect.top = gdigrab->offset_y;

303 clip_rect.right = gdigrab->width + gdigrab->offset_x;

304 clip_rect.bottom = gdigrab->height + gdigrab->offset_y;

305 }

306

307 if (clip_rect.left < virtual_rect.left ||

308 clip_rect.top < virtual_rect.top ||

309 clip_rect.right > virtual_rect.right ||

310 clip_rect.bottom > virtual_rect.bottom) {

311 av_log(s1, AV_LOG_ERROR,

312 "Capture area (%li,%li),(%li,%li) extends outside window area (%li,%li),(%li,%li)",

313 clip_rect.left, clip_rect.top,

314 clip_rect.right, clip_rect.bottom,

315 virtual_rect.left, virtual_rect.top,

316 virtual_rect.right, virtual_rect.bottom);

317 ret = AVERROR(EIO);

318 goto error;

319 }

320

321

322 if (name) {

323 av_log(s1, AV_LOG_INFO,

324 "Found window %s, capturing %lix%lix%i at (%li,%li)\n",

325 name,

326 clip_rect.right - clip_rect.left,

327 clip_rect.bottom - clip_rect.top,

328 bpp, clip_rect.left, clip_rect.top);

329 } else {

330 av_log(s1, AV_LOG_INFO,

331 "Capturing whole desktop as %lix%lix%i at (%li,%li)\n",

332 clip_rect.right - clip_rect.left,

333 clip_rect.bottom - clip_rect.top,

334 bpp, clip_rect.left, clip_rect.top);

335 }

336

337 if (clip_rect.right - clip_rect.left <= 0 ||

338 clip_rect.bottom - clip_rect.top <= 0 || bpp%8) {

339 av_log(s1, AV_LOG_ERROR, "Invalid properties, aborting\n");

340 ret = AVERROR(EIO);

341 goto error;

342 }

343

344 dest_hdc = CreateCompatibleDC(source_hdc);

345 if (!dest_hdc) {

346 WIN32_API_ERROR("Screen DC CreateCompatibleDC");

347 ret = AVERROR(EIO);

348 goto error;

349 }

350

351 /* Create a DIB and select it into the dest_hdc */

352 bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);

353 bmi.bmiHeader.biWidth = clip_rect.right - clip_rect.left;

354 bmi.bmiHeader.biHeight = -(clip_rect.bottom - clip_rect.top);

355 bmi.bmiHeader.biPlanes = 1;

356 bmi.bmiHeader.biBitCount = bpp;

357 bmi.bmiHeader.biCompression = BI_RGB;

358 bmi.bmiHeader.biSizeImage = 0;

359 bmi.bmiHeader.biXPelsPerMeter = 0;

360 bmi.bmiHeader.biYPelsPerMeter = 0;

361 bmi.bmiHeader.biClrUsed = 0;

362 bmi.bmiHeader.biClrImportant = 0;

363 hbmp = CreateDIBSection(dest_hdc, &bmi, DIB_RGB_COLORS,

364 &buffer, NULL, 0);

365 if (!hbmp) {

366 WIN32_API_ERROR("Creating DIB Section");

367 ret = AVERROR(EIO);

368 goto error;

369 }

370

371 if (!SelectObject(dest_hdc, hbmp)) {

372 WIN32_API_ERROR("SelectObject");

373 ret = AVERROR(EIO);

374 goto error;

375 }

376

377 /* Get info from the bitmap */

378 GetObject(hbmp, sizeof(BITMAP), &bmp);

379

380 st = avformat_new_stream(s1, NULL);

381 if (!st) {

382 ret = AVERROR(ENOMEM);

383 goto error;

384 }

385 avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */

386

387 gdigrab->frame_size = bmp.bmWidthBytes * bmp.bmHeight * bmp.bmPlanes;

388 gdigrab->header_size = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) +

389 (bpp <= 8 ? (1 << bpp) : 0) * sizeof(RGBQUAD) /* palette size */;

390 gdigrab->time_base = av_inv_q(gdigrab->framerate);

391 gdigrab->time_frame = av_gettime() / av_q2d(gdigrab->time_base);

392

393 gdigrab->hwnd = hwnd;

394 gdigrab->source_hdc = source_hdc;

395 gdigrab->dest_hdc = dest_hdc;

396 gdigrab->hbmp = hbmp;

397 gdigrab->bmi = bmi;

398 gdigrab->buffer = buffer;

399 gdigrab->clip_rect = clip_rect;

400

401 gdigrab->cursor_error_printed = 0;

402

403 if (gdigrab->show_region) {

404 if (gdigrab_region_wnd_init(s1, gdigrab)) {

405 ret = AVERROR(EIO);

406 goto error;

407 }

408 }

409

410 st->avg_frame_rate = av_inv_q(gdigrab->time_base);

411

412 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;

413 st->codecpar->codec_id = AV_CODEC_ID_BMP;

414 st->codecpar->bit_rate = (gdigrab->header_size + gdigrab->frame_size) * 1/av_q2d(gdigrab->time_base) * 8;

415

416 return 0;

417

418 error:

419 if (source_hdc)

420 ReleaseDC(hwnd, source_hdc);

421 if (dest_hdc)

422 DeleteDC(dest_hdc);

423 if (hbmp)

424 DeleteObject(hbmp);

425 if (source_hdc)

426 DeleteDC(source_hdc);

427 return ret;

428 }

429

430 /**

431 * Paints a mouse pointer in a Win32 image.

432 *

433 * @param s1 Context of the log information

434 * @param s Current grad structure

435 */

436 static void paint_mouse_pointer(AVFormatContext *s1, struct gdigrab *gdigrab)

437 {

438 CURSORINFO ci = {0};

439

440 #define CURSOR_ERROR(str) \

441 if (!gdigrab->cursor_error_printed) { \

442 WIN32_API_ERROR(str); \

443 gdigrab->cursor_error_printed = 1; \

444 }

445

446 ci.cbSize = sizeof(ci);

447

448 if (GetCursorInfo(&ci)) {

449 HCURSOR icon = CopyCursor(ci.hCursor);

450 ICONINFO info;

451 POINT pos;

452 RECT clip_rect = gdigrab->clip_rect;

453 HWND hwnd = gdigrab->hwnd;

454 int horzres = GetDeviceCaps(gdigrab->source_hdc, HORZRES);

455 int vertres = GetDeviceCaps(gdigrab->source_hdc, VERTRES);

456 int desktophorzres = GetDeviceCaps(gdigrab->source_hdc, DESKTOPHORZRES);

457 int desktopvertres = GetDeviceCaps(gdigrab->source_hdc, DESKTOPVERTRES);

458 info.hbmMask = NULL;

459 info.hbmColor = NULL;

460

461 if (ci.flags != CURSOR_SHOWING)

462 return;

463

464 if (!icon) {

465 /* Use the standard arrow cursor as a fallback.

466 * You'll probably only hit this in Wine, which can't fetch

467 * the current system cursor. */

468 icon = CopyCursor(LoadCursor(NULL, IDC_ARROW));

469 }

470

471 if (!GetIconInfo(icon, &info)) {

472 CURSOR_ERROR("Could not get icon info");

473 goto icon_error;

474 }

475

476 pos.x = ci.ptScreenPos.x - clip_rect.left - info.xHotspot;

477 pos.y = ci.ptScreenPos.y - clip_rect.top - info.yHotspot;

478

479 if (hwnd) {

480 RECT rect;

481

482 if (GetWindowRect(hwnd, &rect)) {

483 pos.x -= rect.left;

484 pos.y -= rect.top;

485 } else {

486 CURSOR_ERROR("Couldn't get window rectangle");

487 goto icon_error;

488 }

489 }

490

491 //that would keep the correct location of mouse with hidpi screens

492 pos.x = pos.x * desktophorzres / horzres;

493 pos.y = pos.y * desktopvertres / vertres;

494

495 av_log(s1, AV_LOG_DEBUG, "Cursor pos (%li,%li) -> (%li,%li)\n",

496 ci.ptScreenPos.x, ci.ptScreenPos.y, pos.x, pos.y);

497

498 if (pos.x >= 0 && pos.x <= clip_rect.right - clip_rect.left &&

499 pos.y >= 0 && pos.y <= clip_rect.bottom - clip_rect.top) {

500 if (!DrawIcon(gdigrab->dest_hdc, pos.x, pos.y, icon))

501 CURSOR_ERROR("Couldn't draw icon");

502 }

503

504 icon_error:

505 if (info.hbmMask)

506 DeleteObject(info.hbmMask);

507 if (info.hbmColor)

508 DeleteObject(info.hbmColor);

509 if (icon)

510 DestroyCursor(icon);

511 } else {

512 CURSOR_ERROR("Couldn't get cursor info");

513 }

514 }

515

516 /**

517 * Grabs a frame from gdi (public device demuxer API).

518 *

519 * @param s1 Context from avformat core

520 * @param pkt Packet holding the grabbed frame

521 * @return frame size in bytes

522 */

523 static int gdigrab_read_packet(AVFormatContext *s1, AVPacket *pkt)

524 {

525 struct gdigrab *gdigrab = s1->priv_data;

526

527 HDC dest_hdc = gdigrab->dest_hdc;

528 HDC source_hdc = gdigrab->source_hdc;

529 RECT clip_rect = gdigrab->clip_rect;

530 AVRational time_base = gdigrab->time_base;

531 int64_t time_frame = gdigrab->time_frame;

532

533 BITMAPFILEHEADER bfh;

534 int file_size = gdigrab->header_size + gdigrab->frame_size;

535

536 int64_t curtime, delay;

537

538 /* Calculate the time of the next frame */

539 time_frame += INT64_C(1000000);

540

541 /* Run Window message processing queue */

542 if (gdigrab->show_region)

543 gdigrab_region_wnd_update(s1, gdigrab);

544

545 /* wait based on the frame rate */

546 for (;;) {

547 curtime = av_gettime();

548 delay = time_frame * av_q2d(time_base) - curtime;

549 if (delay <= 0) {

550 if (delay < INT64_C(-1000000) * av_q2d(time_base)) {

551 time_frame += INT64_C(1000000);

552 }

553 break;

554 }

555 if (s1->flags & AVFMT_FLAG_NONBLOCK) {

556 return AVERROR(EAGAIN);

557 } else {

558 av_usleep(delay);

559 }

560 }

561

562 if (av_new_packet(pkt, file_size) < 0)

563 return AVERROR(ENOMEM);

564 pkt->pts = curtime;

565

566 /* Blit screen grab */

567 if (!BitBlt(dest_hdc, 0, 0,

568 clip_rect.right - clip_rect.left,

569 clip_rect.bottom - clip_rect.top,

570 source_hdc,

571 clip_rect.left, clip_rect.top, SRCCOPY | CAPTUREBLT)) {

572 WIN32_API_ERROR("Failed to capture image");

573 return AVERROR(EIO);

574 }

575 if (gdigrab->draw_mouse)

576 paint_mouse_pointer(s1, gdigrab);

577

578 /* Copy bits to packet data */

579

580 bfh.bfType = 0x4d42; /* "BM" in little-endian */

581 bfh.bfSize = file_size;

582 bfh.bfReserved1 = 0;

583 bfh.bfReserved2 = 0;

584 bfh.bfOffBits = gdigrab->header_size;

585

586 memcpy(pkt->data, &bfh, sizeof(bfh));

587

588 memcpy(pkt->data + sizeof(bfh), &gdigrab->bmi.bmiHeader, sizeof(gdigrab->bmi.bmiHeader));

589

590 if (gdigrab->bmi.bmiHeader.biBitCount <= 8)

591 GetDIBColorTable(dest_hdc, 0, 1 << gdigrab->bmi.bmiHeader.biBitCount,

592 (RGBQUAD *) (pkt->data + sizeof(bfh) + sizeof(gdigrab->bmi.bmiHeader)));

593

594 memcpy(pkt->data + gdigrab->header_size, gdigrab->buffer, gdigrab->frame_size);

595

596 gdigrab->time_frame = time_frame;

597

598 return gdigrab->header_size + gdigrab->frame_size;

599 }

600

601 /**

602 * Closes gdi frame grabber (public device demuxer API).

603 *

604 * @param s1 Context from avformat core

605 * @return 0 success, !0 failure

606 */

607 static int gdigrab_read_close(AVFormatContext *s1)

608 {

609 struct gdigrab *s = s1->priv_data;

610

611 if (s->show_region)

612 gdigrab_region_wnd_destroy(s1, s);

613

614 if (s->source_hdc)

615 ReleaseDC(s->hwnd, s->source_hdc);

616 if (s->dest_hdc)

617 DeleteDC(s->dest_hdc);

618 if (s->hbmp)

619 DeleteObject(s->hbmp);

620 if (s->source_hdc)

621 DeleteDC(s->source_hdc);

622

623 return 0;

624 }

625

626 #define OFFSET(x) offsetof(struct gdigrab, x)

627 #define DEC AV_OPT_FLAG_DECODING_PARAM

628 static const AVOption options[] = {

629 { "draw_mouse", "draw the mouse pointer", OFFSET(draw_mouse), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, DEC },

630 { "show_region", "draw border around capture area", OFFSET(show_region), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC },

631 { "framerate", "set video frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "ntsc"}, 0, INT_MAX, DEC },

632 { "video_size", "set video frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },

633 { "offset_x", "capture area x offset", OFFSET(offset_x), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC },

634 { "offset_y", "capture area y offset", OFFSET(offset_y), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC },

635 { NULL },

636 };

637

638 static const AVClass gdigrab_class = {

639 .class_name = "GDIgrab indev",

640 .item_name = av_default_item_name,

641 .option = options,

642 .version = LIBAVUTIL_VERSION_INT,

643 };

644

645 /** gdi grabber device demuxer declaration */

646 AVInputFormat ff_gdigrab_demuxer = {

647 .name = "gdigrab",

648 .long_name = NULL_IF_CONFIG_SMALL("GDI API Windows frame grabber"),

649 .priv_data_size = sizeof(struct gdigrab),

650 .read_header = gdigrab_read_header,

651 .read_packet = gdigrab_read_packet,

652 .read_close = gdigrab_read_close,

653 .flags = AVFMT_NOFILE,

654 .priv_class = &gdigrab_class,

655 };

gdigrab_read_packet

static int gdigrab_read_packet(AVFormatContext *s1, AVPacket *pkt)

Grabs a frame from gdi (public device demuxer API).

Definition: gdigrab.c:523

OFFSET

#define OFFSET(x)

Definition: gdigrab.c:626

NULL

#define NULL

Definition: coverity.c:32

const char * s

Definition: avisynth_c.h:768

gdigrab::show_region

int show_region

Draw border (private option)

Definition: gdigrab.c:49

AVOption

AVOption.

Definition: opt.h:246

AV_LOG_WARNING

#define AV_LOG_WARNING

Something somehow does not look correct.

Definition: log.h:182

LIBAVUTIL_VERSION_INT

#define LIBAVUTIL_VERSION_INT

Definition: version.h:85

options

static const AVOption options[]

Definition: gdigrab.c:628

avpriv_set_pts_info

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:4820

AV_OPT_TYPE_INT

Definition: opt.h:223

AVCodecParameters::codec_id

enum AVCodecID codec_id

Specific type of the encoded data (the codec used).

Definition: avcodec.h:3884

av_default_item_name

const char * av_default_item_name(void *ptr)

Return the context name.

Definition: log.c:191

gdigrab::frame_size

int frame_size

Size in bytes of the frame pixel data.

Definition: gdigrab.c:43

time.h

gdigrab::bmi

BITMAPINFO bmi

Information describing DIB format.

Definition: gdigrab.c:59

av_usleep

int av_usleep(unsigned usec)

Sleep for a period of time.

Definition: time.c:84

gdigrab::region_hwnd

HWND region_hwnd

Handle of the region border window.

Definition: gdigrab.c:64

AVInputFormat

Definition: avformat.h:642

pkt

static AVPacket pkt

Definition: demuxing_decoding.c:54

gdigrab_read_close

static int gdigrab_read_close(AVFormatContext *s1)

Closes gdi frame grabber (public device demuxer API).

Definition: gdigrab.c:607

gdigrab_region_wnd_destroy

static void gdigrab_region_wnd_destroy(AVFormatContext *s1, struct gdigrab *gdigrab)

Cleanup/free the region outline window.

Definition: gdigrab.c:187

AVFormatContext

Format I/O context.

Definition: avformat.h:1342

AVClass::class_name

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

AVFMT_FLAG_NONBLOCK

#define AVFMT_FLAG_NONBLOCK

Do not block when reading packets from input.

Definition: avformat.h:1476

config.h

opt.h

AVOptions.

avformat_new_stream

AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)

Add a new stream to a media file.

Definition: utils.c:4450

gdigrab::clip_rect

RECT clip_rect

The subarea of the screen or window to clip.

Definition: gdigrab.c:62

gdigrab_region_wnd_proc

static LRESULT CALLBACK gdigrab_region_wnd_proc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)

Callback to handle Windows messages for the region outline window.

Definition: gdigrab.c:86

AVFormatContext::flags

int flags

Flags modifying the (de)muxer behaviour.

Definition: avformat.h:1473

AVPacket::data

uint8_t * data

Definition: avcodec.h:1430

av_q2d

static double av_q2d(AVRational a)

Convert an AVRational to a double.

Definition: rational.h:104

ff_gdigrab_demuxer

AVInputFormat ff_gdigrab_demuxer

gdi grabber device demuxer declaration

Definition: gdigrab.c:646

HWND

HANDLE HWND

Definition: basicDataTypeConversions.h:22

av_log

#define av_log(a,...)

Definition: tableprint_vlc.h:28

AVCodecParameters::bit_rate

int64_t bit_rate

The average bitrate of the encoded data (in bits per second).

Definition: avcodec.h:3913

DEC

#define DEC

Definition: gdigrab.c:627

av_new_packet

int av_new_packet(AVPacket *pkt, int size)

Allocate the payload of a packet and initialize its fields with default values.

Definition: avpacket.c:86

AV_LOG_ERROR

#define AV_LOG_ERROR

Something went wrong and cannot losslessly be recovered.

Definition: log.h:176

AVERROR

#define AVERROR(e)

Definition: error.h:43

FALSE

#define FALSE

Definition: windows2linux.h:37

gdigrab_read_header

static int gdigrab_read_header(AVFormatContext *s1)

Initializes the gdi grab device demuxer (public device demuxer API).

Definition: gdigrab.c:222

NULL_IF_CONFIG_SMALL

#define NULL_IF_CONFIG_SMALL(x)

Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...

Definition: internal.h:186

AVFormatContext::url

char * url

input or output URL.

Definition: avformat.h:1438

gdigrab::hbmp

HBITMAP hbmp

Information on the bitmap captured.

Definition: gdigrab.c:60

AV_CODEC_ID_BMP

Definition: avcodec.h:296

AV_LOG_DEBUG

#define AV_LOG_DEBUG

Stuff which is only useful for libav* developers.

Definition: log.h:197

AVCodecParameters::codec_type

enum AVMediaType codec_type

General type of the encoded data.

Definition: avcodec.h:3880

width

uint16_t width

Definition: gdv.c:47

gdigrab::framerate

AVRational framerate

Capture framerate (private option)

Definition: gdigrab.c:50

internal.h

AVStream::avg_frame_rate

AVRational avg_frame_rate

Average framerate.

Definition: avformat.h:946

gdigrab::time_frame

int64_t time_frame

Current time.

Definition: gdigrab.c:46

paint_mouse_pointer

static void paint_mouse_pointer(AVFormatContext *s1, struct gdigrab *gdigrab)

Paints a mouse pointer in a Win32 image.

Definition: gdigrab.c:436

gdigrab_class

static const AVClass gdigrab_class

Definition: gdigrab.c:638

gdigrab::height

int height

Height of the grab frame (private option)

Definition: gdigrab.c:52

gdigrab::time_base

AVRational time_base

Time base.

Definition: gdigrab.c:45

gdigrab::header_size

int header_size

Size in bytes of the DIB header.

Definition: gdigrab.c:44

LONG_PTR

int32_t * LONG_PTR

Definition: basicDataTypeConversions.h:58

gdigrab::dest_hdc

HDC dest_hdc

Destination, source-compatible DC.

Definition: gdigrab.c:58

REGION_WND_BORDER

#define REGION_WND_BORDER

Definition: gdigrab.c:72

gdigrab

GDI Device Demuxer context.

Definition: gdigrab.c:40

gdigrab::buffer

void * buffer

The buffer containing the bitmap image data.

Definition: gdigrab.c:61

WIN32_API_ERROR

#define WIN32_API_ERROR(str)

Definition: gdigrab.c:69

error

static void error(const char *err)

Definition: target_dec_fuzzer.c:59

av_gettime

int64_t av_gettime(void)

Get the current time in microseconds.

Definition: time.c:39

AVStream

Stream structure.

Definition: avformat.h:873

gdigrab::hwnd

HWND hwnd

Handle of the window for the grab.

Definition: gdigrab.c:56

AV_LOG_INFO

#define AV_LOG_INFO

Standard information.

Definition: log.h:187

gdigrab::cursor_error_printed

int cursor_error_printed

Definition: gdigrab.c:66

gdigrab::offset_y

int offset_y

Capture y offset (private option)

Definition: gdigrab.c:54

rect::x

int x

Definition: f_ebur128.c:91

AVClass

Describe the class of an AVClass context structure.

Definition: log.h:67

rect

Definition: f_ebur128.c:91

AVRational

Rational number (pair of numerator and denominator).

Definition: rational.h:58

gdigrab::source_hdc

HDC source_hdc

Source device context.

Definition: gdigrab.c:57

AV_OPT_TYPE_VIDEO_RATE

offset must point to AVRational

Definition: opt.h:236

#define s1

Definition: regdef.h:38

AV_OPT_TYPE_IMAGE_SIZE

offset must point to two consecutive integers

Definition: opt.h:233

DWORD

uint32_t DWORD

Definition: basicDataTypeConversions.h:51

av_inv_q

static av_always_inline AVRational av_inv_q(AVRational q)

Invert a rational.

Definition: rational.h:159

gdigrab::width

int width

Width of the grab frame (private option)

Definition: gdigrab.c:51

gdigrab::draw_mouse

int draw_mouse

Draw mouse cursor (private option)

Definition: gdigrab.c:48

AVFMT_NOFILE

#define AVFMT_NOFILE

Demuxer will use avio_open, no opened file should be provided by the caller.

Definition: avformat.h:465

HBITMAP

void * HBITMAP

Definition: basicDataTypeConversions.h:25

LRESULT

LONG_PTR LRESULT

Definition: basicDataTypeConversions.h:59

gdigrab_region_wnd_init

static int gdigrab_region_wnd_init(AVFormatContext *s1, struct gdigrab *gdigrab)

Initialize the region outline window.

Definition: gdigrab.c:121

AVFormatContext::priv_data

void * priv_data

Format private data.

Definition: avformat.h:1370

gdigrab::offset_x

int offset_x

Capture x offset (private option)

Definition: gdigrab.c:53

CURSOR_ERROR

#define CURSOR_ERROR(str)

UINT

unsigned int UINT

Definition: basicDataTypeConversions.h:49

AVInputFormat::name

const char * name

A comma separated list of short names for the format.

Definition: avformat.h:647

AVMEDIA_TYPE_VIDEO

Definition: avutil.h:201

AVStream::codecpar

AVCodecParameters * codecpar

Codec parameters associated with this stream.

Definition: avformat.h:1020

AVPacket

This structure stores compressed data.

Definition: avcodec.h:1407

AVPacket::pts

int64_t pts

Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...

Definition: avcodec.h:1423

buffer

GLuint buffer

Definition: opengl_enc.c:102

name

const char * name

Definition: opengl_enc.c:103

gdigrab_region_wnd_update

static void gdigrab_region_wnd_update(AVFormatContext *s1, struct gdigrab *gdigrab)

Process the Windows message queue.

Definition: gdigrab.c:205

HDC

void * HDC

Definition: basicDataTypeConversions.h:24

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