Imported Debian version 2.5.0~trusty1.1
[deb_ffmpeg.git] / ffmpeg / libavdevice / gdigrab.c
CommitLineData
2ba45a60
DM
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 */
40struct 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 */
85static LRESULT CALLBACK
86gdigrab_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 */
120static int
121gdigrab_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
170error:
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 */
186static void
187gdigrab_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 */
204static void
205gdigrab_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 */
221static int
222gdigrab_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
407error:
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 */
425static 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
485icon_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 */
504static 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 */
588static 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
609static 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
619static 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 */
627AVInputFormat 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};