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->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 };

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