FFmpeg  4.4
gdigrab.c
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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 
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
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 
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
188 {
189  if (gdigrab->region_hwnd)
190  DestroyWindow(gdigrab->region_hwnd);
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
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
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) {
252  "Can't find window '%s', aborting.\n", name);
253  ret = AVERROR(EIO);
254  goto error;
255  }
256  if (gdigrab->show_region) {
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 {
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  horzres = GetDeviceCaps(source_hdc, HORZRES);
281  vertres = GetDeviceCaps(source_hdc, VERTRES);
282  desktophorzres = GetDeviceCaps(source_hdc, DESKTOPHORZRES);
283  desktopvertres = GetDeviceCaps(source_hdc, DESKTOPVERTRES);
284 
285  if (hwnd) {
286  GetClientRect(hwnd, &virtual_rect);
287  /* window -- get the right height and width for scaling DPI */
288  virtual_rect.left = virtual_rect.left * desktophorzres / horzres;
289  virtual_rect.right = virtual_rect.right * desktophorzres / horzres;
290  virtual_rect.top = virtual_rect.top * desktopvertres / vertres;
291  virtual_rect.bottom = virtual_rect.bottom * desktopvertres / vertres;
292  } else {
293  /* desktop -- get the right height and width for scaling DPI */
294  virtual_rect.left = GetSystemMetrics(SM_XVIRTUALSCREEN);
295  virtual_rect.top = GetSystemMetrics(SM_YVIRTUALSCREEN);
296  virtual_rect.right = (virtual_rect.left + GetSystemMetrics(SM_CXVIRTUALSCREEN)) * desktophorzres / horzres;
297  virtual_rect.bottom = (virtual_rect.top + GetSystemMetrics(SM_CYVIRTUALSCREEN)) * desktopvertres / vertres;
298  }
299 
300  /* If no width or height set, use full screen/window area */
301  if (!gdigrab->width || !gdigrab->height) {
302  clip_rect.left = virtual_rect.left;
303  clip_rect.top = virtual_rect.top;
304  clip_rect.right = virtual_rect.right;
305  clip_rect.bottom = virtual_rect.bottom;
306  } else {
307  clip_rect.left = gdigrab->offset_x;
308  clip_rect.top = gdigrab->offset_y;
309  clip_rect.right = gdigrab->width + gdigrab->offset_x;
310  clip_rect.bottom = gdigrab->height + gdigrab->offset_y;
311  }
312 
313  if (clip_rect.left < virtual_rect.left ||
314  clip_rect.top < virtual_rect.top ||
315  clip_rect.right > virtual_rect.right ||
316  clip_rect.bottom > virtual_rect.bottom) {
318  "Capture area (%li,%li),(%li,%li) extends outside window area (%li,%li),(%li,%li)",
319  clip_rect.left, clip_rect.top,
320  clip_rect.right, clip_rect.bottom,
321  virtual_rect.left, virtual_rect.top,
322  virtual_rect.right, virtual_rect.bottom);
323  ret = AVERROR(EIO);
324  goto error;
325  }
326 
327 
328  if (name) {
330  "Found window %s, capturing %lix%lix%i at (%li,%li)\n",
331  name,
332  clip_rect.right - clip_rect.left,
333  clip_rect.bottom - clip_rect.top,
334  bpp, clip_rect.left, clip_rect.top);
335  } else {
337  "Capturing whole desktop as %lix%lix%i at (%li,%li)\n",
338  clip_rect.right - clip_rect.left,
339  clip_rect.bottom - clip_rect.top,
340  bpp, clip_rect.left, clip_rect.top);
341  }
342 
343  if (clip_rect.right - clip_rect.left <= 0 ||
344  clip_rect.bottom - clip_rect.top <= 0 || bpp%8) {
345  av_log(s1, AV_LOG_ERROR, "Invalid properties, aborting\n");
346  ret = AVERROR(EIO);
347  goto error;
348  }
349 
350  dest_hdc = CreateCompatibleDC(source_hdc);
351  if (!dest_hdc) {
352  WIN32_API_ERROR("Screen DC CreateCompatibleDC");
353  ret = AVERROR(EIO);
354  goto error;
355  }
356 
357  /* Create a DIB and select it into the dest_hdc */
358  bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
359  bmi.bmiHeader.biWidth = clip_rect.right - clip_rect.left;
360  bmi.bmiHeader.biHeight = -(clip_rect.bottom - clip_rect.top);
361  bmi.bmiHeader.biPlanes = 1;
362  bmi.bmiHeader.biBitCount = bpp;
363  bmi.bmiHeader.biCompression = BI_RGB;
364  bmi.bmiHeader.biSizeImage = 0;
365  bmi.bmiHeader.biXPelsPerMeter = 0;
366  bmi.bmiHeader.biYPelsPerMeter = 0;
367  bmi.bmiHeader.biClrUsed = 0;
368  bmi.bmiHeader.biClrImportant = 0;
369  hbmp = CreateDIBSection(dest_hdc, &bmi, DIB_RGB_COLORS,
370  &buffer, NULL, 0);
371  if (!hbmp) {
372  WIN32_API_ERROR("Creating DIB Section");
373  ret = AVERROR(EIO);
374  goto error;
375  }
376 
377  if (!SelectObject(dest_hdc, hbmp)) {
378  WIN32_API_ERROR("SelectObject");
379  ret = AVERROR(EIO);
380  goto error;
381  }
382 
383  /* Get info from the bitmap */
384  GetObject(hbmp, sizeof(BITMAP), &bmp);
385 
386  st = avformat_new_stream(s1, NULL);
387  if (!st) {
388  ret = AVERROR(ENOMEM);
389  goto error;
390  }
391  avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
392 
393  gdigrab->frame_size = bmp.bmWidthBytes * bmp.bmHeight * bmp.bmPlanes;
394  gdigrab->header_size = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) +
395  (bpp <= 8 ? (1 << bpp) : 0) * sizeof(RGBQUAD) /* palette size */;
398 
399  gdigrab->hwnd = hwnd;
402  gdigrab->hbmp = hbmp;
403  gdigrab->bmi = bmi;
404  gdigrab->buffer = buffer;
406 
408 
409  if (gdigrab->show_region) {
411  ret = AVERROR(EIO);
412  goto error;
413  }
414  }
415 
417 
421 
422  return 0;
423 
424 error:
425  if (source_hdc)
426  ReleaseDC(hwnd, source_hdc);
427  if (dest_hdc)
428  DeleteDC(dest_hdc);
429  if (hbmp)
430  DeleteObject(hbmp);
431  if (source_hdc)
432  DeleteDC(source_hdc);
433  return ret;
434 }
435 
436 /**
437  * Paints a mouse pointer in a Win32 image.
438  *
439  * @param s1 Context of the log information
440  * @param s Current grad structure
441  */
443 {
444  CURSORINFO ci = {0};
445 
446 #define CURSOR_ERROR(str) \
447  if (!gdigrab->cursor_error_printed) { \
448  WIN32_API_ERROR(str); \
449  gdigrab->cursor_error_printed = 1; \
450  }
451 
452  ci.cbSize = sizeof(ci);
453 
454  if (GetCursorInfo(&ci)) {
455  HCURSOR icon = CopyCursor(ci.hCursor);
456  ICONINFO info;
457  POINT pos;
458  RECT clip_rect = gdigrab->clip_rect;
459  HWND hwnd = gdigrab->hwnd;
460  int horzres = GetDeviceCaps(gdigrab->source_hdc, HORZRES);
461  int vertres = GetDeviceCaps(gdigrab->source_hdc, VERTRES);
462  int desktophorzres = GetDeviceCaps(gdigrab->source_hdc, DESKTOPHORZRES);
463  int desktopvertres = GetDeviceCaps(gdigrab->source_hdc, DESKTOPVERTRES);
464  info.hbmMask = NULL;
465  info.hbmColor = NULL;
466 
467  if (ci.flags != CURSOR_SHOWING)
468  return;
469 
470  if (!icon) {
471  /* Use the standard arrow cursor as a fallback.
472  * You'll probably only hit this in Wine, which can't fetch
473  * the current system cursor. */
474  icon = CopyCursor(LoadCursor(NULL, IDC_ARROW));
475  }
476 
477  if (!GetIconInfo(icon, &info)) {
478  CURSOR_ERROR("Could not get icon info");
479  goto icon_error;
480  }
481 
482  if (hwnd) {
483  RECT rect;
484 
485  if (GetWindowRect(hwnd, &rect)) {
486  pos.x = ci.ptScreenPos.x - clip_rect.left - info.xHotspot - rect.left;
487  pos.y = ci.ptScreenPos.y - clip_rect.top - info.yHotspot - rect.top;
488 
489  //that would keep the correct location of mouse with hidpi screens
490  pos.x = pos.x * desktophorzres / horzres;
491  pos.y = pos.y * desktopvertres / vertres;
492  } else {
493  CURSOR_ERROR("Couldn't get window rectangle");
494  goto icon_error;
495  }
496  } else {
497  //that would keep the correct location of mouse with hidpi screens
498  pos.x = ci.ptScreenPos.x * desktophorzres / horzres - clip_rect.left - info.xHotspot;
499  pos.y = ci.ptScreenPos.y * desktopvertres / vertres - clip_rect.top - info.yHotspot;
500  }
501 
502  av_log(s1, AV_LOG_DEBUG, "Cursor pos (%li,%li) -> (%li,%li)\n",
503  ci.ptScreenPos.x, ci.ptScreenPos.y, pos.x, pos.y);
504 
505  if (pos.x >= 0 && pos.x <= clip_rect.right - clip_rect.left &&
506  pos.y >= 0 && pos.y <= clip_rect.bottom - clip_rect.top) {
507  if (!DrawIcon(gdigrab->dest_hdc, pos.x, pos.y, icon))
508  CURSOR_ERROR("Couldn't draw icon");
509  }
510 
511 icon_error:
512  if (info.hbmMask)
513  DeleteObject(info.hbmMask);
514  if (info.hbmColor)
515  DeleteObject(info.hbmColor);
516  if (icon)
517  DestroyCursor(icon);
518  } else {
519  CURSOR_ERROR("Couldn't get cursor info");
520  }
521 }
522 
523 /**
524  * Grabs a frame from gdi (public device demuxer API).
525  *
526  * @param s1 Context from avformat core
527  * @param pkt Packet holding the grabbed frame
528  * @return frame size in bytes
529  */
531 {
532  struct gdigrab *gdigrab = s1->priv_data;
533 
534  HDC dest_hdc = gdigrab->dest_hdc;
536  RECT clip_rect = gdigrab->clip_rect;
538  int64_t time_frame = gdigrab->time_frame;
539 
540  BITMAPFILEHEADER bfh;
541  int file_size = gdigrab->header_size + gdigrab->frame_size;
542 
543  int64_t curtime, delay;
544 
545  /* Calculate the time of the next frame */
546  time_frame += INT64_C(1000000);
547 
548  /* Run Window message processing queue */
549  if (gdigrab->show_region)
551 
552  /* wait based on the frame rate */
553  for (;;) {
554  curtime = av_gettime_relative();
555  delay = time_frame * av_q2d(time_base) - curtime;
556  if (delay <= 0) {
557  if (delay < INT64_C(-1000000) * av_q2d(time_base)) {
558  time_frame += INT64_C(1000000);
559  }
560  break;
561  }
562  if (s1->flags & AVFMT_FLAG_NONBLOCK) {
563  return AVERROR(EAGAIN);
564  } else {
565  av_usleep(delay);
566  }
567  }
568 
569  if (av_new_packet(pkt, file_size) < 0)
570  return AVERROR(ENOMEM);
571  pkt->pts = av_gettime();
572 
573  /* Blit screen grab */
574  if (!BitBlt(dest_hdc, 0, 0,
575  clip_rect.right - clip_rect.left,
576  clip_rect.bottom - clip_rect.top,
577  source_hdc,
578  clip_rect.left, clip_rect.top, SRCCOPY | CAPTUREBLT)) {
579  WIN32_API_ERROR("Failed to capture image");
580  return AVERROR(EIO);
581  }
582  if (gdigrab->draw_mouse)
584 
585  /* Copy bits to packet data */
586 
587  bfh.bfType = 0x4d42; /* "BM" in little-endian */
588  bfh.bfSize = file_size;
589  bfh.bfReserved1 = 0;
590  bfh.bfReserved2 = 0;
591  bfh.bfOffBits = gdigrab->header_size;
592 
593  memcpy(pkt->data, &bfh, sizeof(bfh));
594 
595  memcpy(pkt->data + sizeof(bfh), &gdigrab->bmi.bmiHeader, sizeof(gdigrab->bmi.bmiHeader));
596 
597  if (gdigrab->bmi.bmiHeader.biBitCount <= 8)
598  GetDIBColorTable(dest_hdc, 0, 1 << gdigrab->bmi.bmiHeader.biBitCount,
599  (RGBQUAD *) (pkt->data + sizeof(bfh) + sizeof(gdigrab->bmi.bmiHeader)));
600 
602 
604 
606 }
607 
608 /**
609  * Closes gdi frame grabber (public device demuxer API).
610  *
611  * @param s1 Context from avformat core
612  * @return 0 success, !0 failure
613  */
615 {
616  struct gdigrab *s = s1->priv_data;
617 
618  if (s->show_region)
620 
621  if (s->source_hdc)
622  ReleaseDC(s->hwnd, s->source_hdc);
623  if (s->dest_hdc)
624  DeleteDC(s->dest_hdc);
625  if (s->hbmp)
626  DeleteObject(s->hbmp);
627  if (s->source_hdc)
628  DeleteDC(s->source_hdc);
629 
630  return 0;
631 }
632 
633 #define OFFSET(x) offsetof(struct gdigrab, x)
634 #define DEC AV_OPT_FLAG_DECODING_PARAM
635 static const AVOption options[] = {
636  { "draw_mouse", "draw the mouse pointer", OFFSET(draw_mouse), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, DEC },
637  { "show_region", "draw border around capture area", OFFSET(show_region), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC },
638  { "framerate", "set video frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "ntsc"}, 0, INT_MAX, DEC },
639  { "video_size", "set video frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
640  { "offset_x", "capture area x offset", OFFSET(offset_x), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC },
641  { "offset_y", "capture area y offset", OFFSET(offset_y), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC },
642  { NULL },
643 };
644 
645 static const AVClass gdigrab_class = {
646  .class_name = "GDIgrab indev",
647  .item_name = av_default_item_name,
648  .option = options,
649  .version = LIBAVUTIL_VERSION_INT,
651 };
652 
653 /** gdi grabber device demuxer declaration */
655  .name = "gdigrab",
656  .long_name = NULL_IF_CONFIG_SMALL("GDI API Windows frame grabber"),
657  .priv_data_size = sizeof(struct gdigrab),
659  .read_packet = gdigrab_read_packet,
660  .read_close = gdigrab_read_close,
661  .flags = AVFMT_NOFILE,
662  .priv_class = &gdigrab_class,
663 };
#define AVFMT_FLAG_NONBLOCK
Do not block when reading packets from input.
Definition: avformat.h:1366
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:458
#define s(width, name)
Definition: cbs_vp9.c:257
#define NULL
Definition: coverity.c:32
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
static int gdigrab_read_close(AVFormatContext *s1)
Closes gdi frame grabber (public device demuxer API).
Definition: gdigrab.c:614
static void gdigrab_region_wnd_destroy(AVFormatContext *s1, struct gdigrab *gdigrab)
Cleanup/free the region outline window.
Definition: gdigrab.c:187
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
#define REGION_WND_BORDER
Definition: gdigrab.c:72
static const AVOption options[]
Definition: gdigrab.c:635
#define CURSOR_ERROR(str)
#define WIN32_API_ERROR(str)
Definition: gdigrab.c:69
static int gdigrab_read_packet(AVFormatContext *s1, AVPacket *pkt)
Grabs a frame from gdi (public device demuxer API).
Definition: gdigrab.c:530
static int gdigrab_read_header(AVFormatContext *s1)
Initializes the gdi grab device demuxer (public device demuxer API).
Definition: gdigrab.c:222
static void paint_mouse_pointer(AVFormatContext *s1, struct gdigrab *gdigrab)
Paints a mouse pointer in a Win32 image.
Definition: gdigrab.c:442
static const AVClass gdigrab_class
Definition: gdigrab.c:645
#define OFFSET(x)
Definition: gdigrab.c:633
static void gdigrab_region_wnd_update(AVFormatContext *s1, struct gdigrab *gdigrab)
Process the Windows message queue.
Definition: gdigrab.c:205
AVInputFormat ff_gdigrab_demuxer
gdi grabber device demuxer declaration
Definition: gdigrab.c:654
static int gdigrab_region_wnd_init(AVFormatContext *s1, struct gdigrab *gdigrab)
Initialize the region outline window.
Definition: gdigrab.c:121
#define DEC
Definition: gdigrab.c:634
@ AV_OPT_TYPE_IMAGE_SIZE
offset must point to two consecutive integers
Definition: opt.h:235
@ AV_OPT_TYPE_VIDEO_RATE
offset must point to AVRational
Definition: opt.h:238
@ AV_OPT_TYPE_INT
Definition: opt.h:225
@ AV_CODEC_ID_BMP
Definition: codec_id.h:127
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:99
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4505
#define AVERROR(e)
Definition: error.h:43
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
#define AV_LOG_INFO
Standard information.
Definition: log.h:205
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
static double av_q2d(AVRational a)
Convert an AVRational to a double.
Definition: rational.h:104
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
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:4941
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
@ AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT
Definition: log.h:42
AVOptions.
const char * name
Definition: qsvenc.c:46
#define s1
Definition: regdef.h:38
static char buffer[20]
Definition: seek.c:32
unsigned int pos
Definition: spdifenc.c:412
Describe the class of an AVClass context structure.
Definition: log.h:67
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
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
Format I/O context.
Definition: avformat.h:1232
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
AVOption.
Definition: opt.h:248
This structure stores compressed data.
Definition: packet.h:346
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:362
uint8_t * data
Definition: packet.h:369
Rational number (pair of numerator and denominator).
Definition: rational.h:58
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:946
GDI Device Demuxer context.
Definition: gdigrab.c:40
HDC dest_hdc
Destination, source-compatible DC.
Definition: gdigrab.c:58
int height
Height of the grab frame (private option)
Definition: gdigrab.c:52
int show_region
Draw border (private option)
Definition: gdigrab.c:49
HWND hwnd
Handle of the window for the grab.
Definition: gdigrab.c:56
int frame_size
Size in bytes of the frame pixel data.
Definition: gdigrab.c:43
int offset_y
Capture y offset (private option)
Definition: gdigrab.c:54
HBITMAP hbmp
Information on the bitmap captured.
Definition: gdigrab.c:60
AVRational time_base
Time base.
Definition: gdigrab.c:45
int width
Width of the grab frame (private option)
Definition: gdigrab.c:51
RECT clip_rect
The subarea of the screen or window to clip.
Definition: gdigrab.c:62
AVRational framerate
Capture framerate (private option)
Definition: gdigrab.c:50
HWND region_hwnd
Handle of the region border window.
Definition: gdigrab.c:64
HDC source_hdc
Source device context.
Definition: gdigrab.c:57
int offset_x
Capture x offset (private option)
Definition: gdigrab.c:53
void * buffer
The buffer containing the bitmap image data.
Definition: gdigrab.c:61
int64_t time_frame
Current time.
Definition: gdigrab.c:46
BITMAPINFO bmi
Information describing DIB format.
Definition: gdigrab.c:59
int draw_mouse
Draw mouse cursor (private option)
Definition: gdigrab.c:48
int cursor_error_printed
Definition: gdigrab.c:66
int header_size
Size in bytes of the DIB header.
Definition: gdigrab.c:44
Definition: f_ebur128.c:91
#define av_log(a,...)
static void error(const char *err)
int framerate
Definition: h264_levels.c:65
AVPacket * pkt
Definition: movenc.c:59
#define width
int av_usleep(unsigned usec)
Sleep for a period of time.
Definition: time.c:84
int64_t av_gettime_relative(void)
Get the current time in microseconds since some unspecified starting point.
Definition: time.c:56
int64_t av_gettime(void)
Get the current time in microseconds.
Definition: time.c:39