| /* |
| * GDI video grab interface |
| * |
| * This file is part of FFmpeg. |
| * |
| * Copyright (C) 2013 Calvin Walton <calvin.walton@kepstin.ca> |
| * Copyright (C) 2007-2010 Christophe Gisquet <word1.word2@gmail.com> |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public License |
| * as published by the Free Software Foundation; either version 2.1 |
| * of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * GDI frame device demuxer |
| * @author Calvin Walton <calvin.walton@kepstin.ca> |
| * @author Christophe Gisquet <word1.word2@gmail.com> |
| */ |
| |
| #include "config.h" |
| #include "libavformat/internal.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/time.h" |
| #include <windows.h> |
| |
| /** |
| * GDI Device Demuxer context |
| */ |
| struct gdigrab { |
| const AVClass *class; /**< Class for private options */ |
| |
| int frame_size; /**< Size in bytes of the frame pixel data */ |
| int header_size; /**< Size in bytes of the DIB header */ |
| AVRational time_base; /**< Time base */ |
| int64_t time_frame; /**< Current time */ |
| |
| int draw_mouse; /**< Draw mouse cursor (private option) */ |
| int show_region; /**< Draw border (private option) */ |
| AVRational framerate; /**< Capture framerate (private option) */ |
| int width; /**< Width of the grab frame (private option) */ |
| int height; /**< Height of the grab frame (private option) */ |
| int offset_x; /**< Capture x offset (private option) */ |
| int offset_y; /**< Capture y offset (private option) */ |
| |
| HWND hwnd; /**< Handle of the window for the grab */ |
| HDC source_hdc; /**< Source device context */ |
| HDC dest_hdc; /**< Destination, source-compatible DC */ |
| BITMAPINFO bmi; /**< Information describing DIB format */ |
| HBITMAP hbmp; /**< Information on the bitmap captured */ |
| void *buffer; /**< The buffer containing the bitmap image data */ |
| RECT clip_rect; /**< The subarea of the screen or window to clip */ |
| |
| HWND region_hwnd; /**< Handle of the region border window */ |
| |
| int cursor_error_printed; |
| }; |
| |
| #define WIN32_API_ERROR(str) \ |
| av_log(s1, AV_LOG_ERROR, str " (error %li)\n", GetLastError()) |
| |
| #define REGION_WND_BORDER 3 |
| |
| /** |
| * Callback to handle Windows messages for the region outline window. |
| * |
| * In particular, this handles painting the frame rectangle. |
| * |
| * @param hwnd The region outline window handle. |
| * @param msg The Windows message. |
| * @param wparam First Windows message parameter. |
| * @param lparam Second Windows message parameter. |
| * @return 0 success, !0 failure |
| */ |
| static LRESULT CALLBACK |
| gdigrab_region_wnd_proc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam) |
| { |
| PAINTSTRUCT ps; |
| HDC hdc; |
| RECT rect; |
| |
| switch (msg) { |
| case WM_PAINT: |
| hdc = BeginPaint(hwnd, &ps); |
| |
| GetClientRect(hwnd, &rect); |
| FrameRect(hdc, &rect, GetStockObject(BLACK_BRUSH)); |
| |
| rect.left++; rect.top++; rect.right--; rect.bottom--; |
| FrameRect(hdc, &rect, GetStockObject(WHITE_BRUSH)); |
| |
| rect.left++; rect.top++; rect.right--; rect.bottom--; |
| FrameRect(hdc, &rect, GetStockObject(BLACK_BRUSH)); |
| |
| EndPaint(hwnd, &ps); |
| break; |
| default: |
| return DefWindowProc(hwnd, msg, wparam, lparam); |
| } |
| return 0; |
| } |
| |
| /** |
| * Initialize the region outline window. |
| * |
| * @param s1 The format context. |
| * @param gdigrab gdigrab context. |
| * @return 0 success, !0 failure |
| */ |
| static int |
| gdigrab_region_wnd_init(AVFormatContext *s1, struct gdigrab *gdigrab) |
| { |
| HWND hwnd; |
| RECT rect = gdigrab->clip_rect; |
| HRGN region = NULL; |
| HRGN region_interior = NULL; |
| |
| DWORD style = WS_POPUP | WS_VISIBLE; |
| DWORD ex = WS_EX_TOOLWINDOW | WS_EX_TOPMOST | WS_EX_TRANSPARENT; |
| |
| rect.left -= REGION_WND_BORDER; rect.top -= REGION_WND_BORDER; |
| rect.right += REGION_WND_BORDER; rect.bottom += REGION_WND_BORDER; |
| |
| AdjustWindowRectEx(&rect, style, FALSE, ex); |
| |
| // Create a window with no owner; use WC_DIALOG instead of writing a custom |
| // window class |
| hwnd = CreateWindowEx(ex, WC_DIALOG, NULL, style, rect.left, rect.top, |
| rect.right - rect.left, rect.bottom - rect.top, |
| NULL, NULL, NULL, NULL); |
| if (!hwnd) { |
| WIN32_API_ERROR("Could not create region display window"); |
| goto error; |
| } |
| |
| // Set the window shape to only include the border area |
| GetClientRect(hwnd, &rect); |
| region = CreateRectRgn(0, 0, |
| rect.right - rect.left, rect.bottom - rect.top); |
| region_interior = CreateRectRgn(REGION_WND_BORDER, REGION_WND_BORDER, |
| rect.right - rect.left - REGION_WND_BORDER, |
| rect.bottom - rect.top - REGION_WND_BORDER); |
| CombineRgn(region, region, region_interior, RGN_DIFF); |
| if (!SetWindowRgn(hwnd, region, FALSE)) { |
| WIN32_API_ERROR("Could not set window region"); |
| goto error; |
| } |
| // The "region" memory is now owned by the window |
| region = NULL; |
| DeleteObject(region_interior); |
| |
| SetWindowLongPtr(hwnd, GWLP_WNDPROC, (LONG_PTR) gdigrab_region_wnd_proc); |
| |
| ShowWindow(hwnd, SW_SHOW); |
| |
| gdigrab->region_hwnd = hwnd; |
| |
| return 0; |
| |
| error: |
| if (region) |
| DeleteObject(region); |
| if (region_interior) |
| DeleteObject(region_interior); |
| if (hwnd) |
| DestroyWindow(hwnd); |
| return 1; |
| } |
| |
| /** |
| * Cleanup/free the region outline window. |
| * |
| * @param s1 The format context. |
| * @param gdigrab gdigrab context. |
| */ |
| static void |
| gdigrab_region_wnd_destroy(AVFormatContext *s1, struct gdigrab *gdigrab) |
| { |
| if (gdigrab->region_hwnd) |
| DestroyWindow(gdigrab->region_hwnd); |
| gdigrab->region_hwnd = NULL; |
| } |
| |
| /** |
| * Process the Windows message queue. |
| * |
| * This is important to prevent Windows from thinking the window has become |
| * unresponsive. As well, things like WM_PAINT (to actually draw the window |
| * contents) are handled from the message queue context. |
| * |
| * @param s1 The format context. |
| * @param gdigrab gdigrab context. |
| */ |
| static void |
| gdigrab_region_wnd_update(AVFormatContext *s1, struct gdigrab *gdigrab) |
| { |
| HWND hwnd = gdigrab->region_hwnd; |
| MSG msg; |
| |
| while (PeekMessage(&msg, hwnd, 0, 0, PM_REMOVE)) { |
| DispatchMessage(&msg); |
| } |
| } |
| |
| /** |
| * Initializes the gdi grab device demuxer (public device demuxer API). |
| * |
| * @param s1 Context from avformat core |
| * @return AVERROR_IO error, 0 success |
| */ |
| static int |
| gdigrab_read_header(AVFormatContext *s1) |
| { |
| struct gdigrab *gdigrab = s1->priv_data; |
| |
| HWND hwnd; |
| HDC source_hdc = NULL; |
| HDC dest_hdc = NULL; |
| BITMAPINFO bmi; |
| HBITMAP hbmp = NULL; |
| void *buffer = NULL; |
| |
| const char *filename = s1->filename; |
| const char *name = NULL; |
| AVStream *st = NULL; |
| |
| int bpp; |
| int vertres; |
| int desktopvertres; |
| RECT virtual_rect; |
| RECT clip_rect; |
| BITMAP bmp; |
| int ret; |
| |
| if (!strncmp(filename, "title=", 6)) { |
| name = filename + 6; |
| hwnd = FindWindow(NULL, name); |
| if (!hwnd) { |
| av_log(s1, AV_LOG_ERROR, |
| "Can't find window '%s', aborting.\n", name); |
| ret = AVERROR(EIO); |
| goto error; |
| } |
| if (gdigrab->show_region) { |
| av_log(s1, AV_LOG_WARNING, |
| "Can't show region when grabbing a window.\n"); |
| gdigrab->show_region = 0; |
| } |
| } else if (!strcmp(filename, "desktop")) { |
| hwnd = NULL; |
| } else { |
| av_log(s1, AV_LOG_ERROR, |
| "Please use \"desktop\" or \"title=<windowname>\" to specify your target.\n"); |
| ret = AVERROR(EIO); |
| goto error; |
| } |
| |
| /* This will get the device context for the selected window, or if |
| * none, the primary screen */ |
| source_hdc = GetDC(hwnd); |
| if (!source_hdc) { |
| WIN32_API_ERROR("Couldn't get window device context"); |
| ret = AVERROR(EIO); |
| goto error; |
| } |
| bpp = GetDeviceCaps(source_hdc, BITSPIXEL); |
| |
| if (hwnd) { |
| GetClientRect(hwnd, &virtual_rect); |
| } else { |
| /* desktop -- get the right height and width for scaling DPI */ |
| vertres = GetDeviceCaps(source_hdc, VERTRES); |
| desktopvertres = GetDeviceCaps(source_hdc, DESKTOPVERTRES); |
| virtual_rect.left = GetSystemMetrics(SM_XVIRTUALSCREEN); |
| virtual_rect.top = GetSystemMetrics(SM_YVIRTUALSCREEN); |
| virtual_rect.right = (virtual_rect.left + GetSystemMetrics(SM_CXVIRTUALSCREEN)) * desktopvertres / vertres; |
| virtual_rect.bottom = (virtual_rect.top + GetSystemMetrics(SM_CYVIRTUALSCREEN)) * desktopvertres / vertres; |
| } |
| |
| /* If no width or height set, use full screen/window area */ |
| if (!gdigrab->width || !gdigrab->height) { |
| clip_rect.left = virtual_rect.left; |
| clip_rect.top = virtual_rect.top; |
| clip_rect.right = virtual_rect.right; |
| clip_rect.bottom = virtual_rect.bottom; |
| } else { |
| clip_rect.left = gdigrab->offset_x; |
| clip_rect.top = gdigrab->offset_y; |
| clip_rect.right = gdigrab->width + gdigrab->offset_x; |
| clip_rect.bottom = gdigrab->height + gdigrab->offset_y; |
| } |
| |
| if (clip_rect.left < virtual_rect.left || |
| clip_rect.top < virtual_rect.top || |
| clip_rect.right > virtual_rect.right || |
| clip_rect.bottom > virtual_rect.bottom) { |
| av_log(s1, AV_LOG_ERROR, |
| "Capture area (%li,%li),(%li,%li) extends outside window area (%li,%li),(%li,%li)", |
| clip_rect.left, clip_rect.top, |
| clip_rect.right, clip_rect.bottom, |
| virtual_rect.left, virtual_rect.top, |
| virtual_rect.right, virtual_rect.bottom); |
| ret = AVERROR(EIO); |
| goto error; |
| } |
| |
| |
| if (name) { |
| av_log(s1, AV_LOG_INFO, |
| "Found window %s, capturing %lix%lix%i at (%li,%li)\n", |
| name, |
| clip_rect.right - clip_rect.left, |
| clip_rect.bottom - clip_rect.top, |
| bpp, clip_rect.left, clip_rect.top); |
| } else { |
| av_log(s1, AV_LOG_INFO, |
| "Capturing whole desktop as %lix%lix%i at (%li,%li)\n", |
| clip_rect.right - clip_rect.left, |
| clip_rect.bottom - clip_rect.top, |
| bpp, clip_rect.left, clip_rect.top); |
| } |
| |
| if (clip_rect.right - clip_rect.left <= 0 || |
| clip_rect.bottom - clip_rect.top <= 0 || bpp%8) { |
| av_log(s1, AV_LOG_ERROR, "Invalid properties, aborting\n"); |
| ret = AVERROR(EIO); |
| goto error; |
| } |
| |
| dest_hdc = CreateCompatibleDC(source_hdc); |
| if (!dest_hdc) { |
| WIN32_API_ERROR("Screen DC CreateCompatibleDC"); |
| ret = AVERROR(EIO); |
| goto error; |
| } |
| |
| /* Create a DIB and select it into the dest_hdc */ |
| bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER); |
| bmi.bmiHeader.biWidth = clip_rect.right - clip_rect.left; |
| bmi.bmiHeader.biHeight = -(clip_rect.bottom - clip_rect.top); |
| bmi.bmiHeader.biPlanes = 1; |
| bmi.bmiHeader.biBitCount = bpp; |
| bmi.bmiHeader.biCompression = BI_RGB; |
| bmi.bmiHeader.biSizeImage = 0; |
| bmi.bmiHeader.biXPelsPerMeter = 0; |
| bmi.bmiHeader.biYPelsPerMeter = 0; |
| bmi.bmiHeader.biClrUsed = 0; |
| bmi.bmiHeader.biClrImportant = 0; |
| hbmp = CreateDIBSection(dest_hdc, &bmi, DIB_RGB_COLORS, |
| &buffer, NULL, 0); |
| if (!hbmp) { |
| WIN32_API_ERROR("Creating DIB Section"); |
| ret = AVERROR(EIO); |
| goto error; |
| } |
| |
| if (!SelectObject(dest_hdc, hbmp)) { |
| WIN32_API_ERROR("SelectObject"); |
| ret = AVERROR(EIO); |
| goto error; |
| } |
| |
| /* Get info from the bitmap */ |
| GetObject(hbmp, sizeof(BITMAP), &bmp); |
| |
| st = avformat_new_stream(s1, NULL); |
| if (!st) { |
| ret = AVERROR(ENOMEM); |
| goto error; |
| } |
| avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */ |
| |
| gdigrab->frame_size = bmp.bmWidthBytes * bmp.bmHeight * bmp.bmPlanes; |
| gdigrab->header_size = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + |
| (bpp <= 8 ? (1 << bpp) : 0) * sizeof(RGBQUAD) /* palette size */; |
| gdigrab->time_base = av_inv_q(gdigrab->framerate); |
| gdigrab->time_frame = av_gettime() / av_q2d(gdigrab->time_base); |
| |
| gdigrab->hwnd = hwnd; |
| gdigrab->source_hdc = source_hdc; |
| gdigrab->dest_hdc = dest_hdc; |
| gdigrab->hbmp = hbmp; |
| gdigrab->bmi = bmi; |
| gdigrab->buffer = buffer; |
| gdigrab->clip_rect = clip_rect; |
| |
| gdigrab->cursor_error_printed = 0; |
| |
| if (gdigrab->show_region) { |
| if (gdigrab_region_wnd_init(s1, gdigrab)) { |
| ret = AVERROR(EIO); |
| goto error; |
| } |
| } |
| |
| st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| st->codec->codec_id = AV_CODEC_ID_BMP; |
| st->codec->time_base = gdigrab->time_base; |
| st->codec->bit_rate = (gdigrab->header_size + gdigrab->frame_size) * 1/av_q2d(gdigrab->time_base) * 8; |
| |
| return 0; |
| |
| error: |
| if (source_hdc) |
| ReleaseDC(hwnd, source_hdc); |
| if (dest_hdc) |
| DeleteDC(dest_hdc); |
| if (hbmp) |
| DeleteObject(hbmp); |
| if (source_hdc) |
| DeleteDC(source_hdc); |
| return ret; |
| } |
| |
| /** |
| * Paints a mouse pointer in a Win32 image. |
| * |
| * @param s1 Context of the log information |
| * @param s Current grad structure |
| */ |
| static void paint_mouse_pointer(AVFormatContext *s1, struct gdigrab *gdigrab) |
| { |
| CURSORINFO ci = {0}; |
| |
| #define CURSOR_ERROR(str) \ |
| if (!gdigrab->cursor_error_printed) { \ |
| WIN32_API_ERROR(str); \ |
| gdigrab->cursor_error_printed = 1; \ |
| } |
| |
| ci.cbSize = sizeof(ci); |
| |
| if (GetCursorInfo(&ci)) { |
| HCURSOR icon = CopyCursor(ci.hCursor); |
| ICONINFO info; |
| POINT pos; |
| RECT clip_rect = gdigrab->clip_rect; |
| HWND hwnd = gdigrab->hwnd; |
| info.hbmMask = NULL; |
| info.hbmColor = NULL; |
| |
| if (ci.flags != CURSOR_SHOWING) |
| return; |
| |
| if (!icon) { |
| /* Use the standard arrow cursor as a fallback. |
| * You'll probably only hit this in Wine, which can't fetch |
| * the current system cursor. */ |
| icon = CopyCursor(LoadCursor(NULL, IDC_ARROW)); |
| } |
| |
| if (!GetIconInfo(icon, &info)) { |
| CURSOR_ERROR("Could not get icon info"); |
| goto icon_error; |
| } |
| |
| pos.x = ci.ptScreenPos.x - clip_rect.left - info.xHotspot; |
| pos.y = ci.ptScreenPos.y - clip_rect.top - info.yHotspot; |
| |
| if (hwnd) { |
| RECT rect; |
| |
| if (GetWindowRect(hwnd, &rect)) { |
| pos.x -= rect.left; |
| pos.y -= rect.top; |
| } else { |
| CURSOR_ERROR("Couldn't get window rectangle"); |
| goto icon_error; |
| } |
| } |
| |
| av_log(s1, AV_LOG_DEBUG, "Cursor pos (%li,%li) -> (%li,%li)\n", |
| ci.ptScreenPos.x, ci.ptScreenPos.y, pos.x, pos.y); |
| |
| if (pos.x >= 0 && pos.x <= clip_rect.right - clip_rect.left && |
| pos.y >= 0 && pos.y <= clip_rect.bottom - clip_rect.top) { |
| if (!DrawIcon(gdigrab->dest_hdc, pos.x, pos.y, icon)) |
| CURSOR_ERROR("Couldn't draw icon"); |
| } |
| |
| icon_error: |
| if (info.hbmMask) |
| DeleteObject(info.hbmMask); |
| if (info.hbmColor) |
| DeleteObject(info.hbmColor); |
| if (icon) |
| DestroyCursor(icon); |
| } else { |
| CURSOR_ERROR("Couldn't get cursor info"); |
| } |
| } |
| |
| /** |
| * Grabs a frame from gdi (public device demuxer API). |
| * |
| * @param s1 Context from avformat core |
| * @param pkt Packet holding the grabbed frame |
| * @return frame size in bytes |
| */ |
| static int gdigrab_read_packet(AVFormatContext *s1, AVPacket *pkt) |
| { |
| struct gdigrab *gdigrab = s1->priv_data; |
| |
| HDC dest_hdc = gdigrab->dest_hdc; |
| HDC source_hdc = gdigrab->source_hdc; |
| RECT clip_rect = gdigrab->clip_rect; |
| AVRational time_base = gdigrab->time_base; |
| int64_t time_frame = gdigrab->time_frame; |
| |
| BITMAPFILEHEADER bfh; |
| int file_size = gdigrab->header_size + gdigrab->frame_size; |
| |
| int64_t curtime, delay; |
| |
| /* Calculate the time of the next frame */ |
| time_frame += INT64_C(1000000); |
| |
| /* Run Window message processing queue */ |
| if (gdigrab->show_region) |
| gdigrab_region_wnd_update(s1, gdigrab); |
| |
| /* wait based on the frame rate */ |
| for (;;) { |
| curtime = av_gettime(); |
| delay = time_frame * av_q2d(time_base) - curtime; |
| if (delay <= 0) { |
| if (delay < INT64_C(-1000000) * av_q2d(time_base)) { |
| time_frame += INT64_C(1000000); |
| } |
| break; |
| } |
| if (s1->flags & AVFMT_FLAG_NONBLOCK) { |
| return AVERROR(EAGAIN); |
| } else { |
| av_usleep(delay); |
| } |
| } |
| |
| if (av_new_packet(pkt, file_size) < 0) |
| return AVERROR(ENOMEM); |
| pkt->pts = curtime; |
| |
| /* Blit screen grab */ |
| if (!BitBlt(dest_hdc, 0, 0, |
| clip_rect.right - clip_rect.left, |
| clip_rect.bottom - clip_rect.top, |
| source_hdc, |
| clip_rect.left, clip_rect.top, SRCCOPY | CAPTUREBLT)) { |
| WIN32_API_ERROR("Failed to capture image"); |
| return AVERROR(EIO); |
| } |
| if (gdigrab->draw_mouse) |
| paint_mouse_pointer(s1, gdigrab); |
| |
| /* Copy bits to packet data */ |
| |
| bfh.bfType = 0x4d42; /* "BM" in little-endian */ |
| bfh.bfSize = file_size; |
| bfh.bfReserved1 = 0; |
| bfh.bfReserved2 = 0; |
| bfh.bfOffBits = gdigrab->header_size; |
| |
| memcpy(pkt->data, &bfh, sizeof(bfh)); |
| |
| memcpy(pkt->data + sizeof(bfh), &gdigrab->bmi.bmiHeader, sizeof(gdigrab->bmi.bmiHeader)); |
| |
| if (gdigrab->bmi.bmiHeader.biBitCount <= 8) |
| GetDIBColorTable(dest_hdc, 0, 1 << gdigrab->bmi.bmiHeader.biBitCount, |
| (RGBQUAD *) (pkt->data + sizeof(bfh) + sizeof(gdigrab->bmi.bmiHeader))); |
| |
| memcpy(pkt->data + gdigrab->header_size, gdigrab->buffer, gdigrab->frame_size); |
| |
| gdigrab->time_frame = time_frame; |
| |
| return gdigrab->header_size + gdigrab->frame_size; |
| } |
| |
| /** |
| * Closes gdi frame grabber (public device demuxer API). |
| * |
| * @param s1 Context from avformat core |
| * @return 0 success, !0 failure |
| */ |
| static int gdigrab_read_close(AVFormatContext *s1) |
| { |
| struct gdigrab *s = s1->priv_data; |
| |
| if (s->show_region) |
| gdigrab_region_wnd_destroy(s1, s); |
| |
| if (s->source_hdc) |
| ReleaseDC(s->hwnd, s->source_hdc); |
| if (s->dest_hdc) |
| DeleteDC(s->dest_hdc); |
| if (s->hbmp) |
| DeleteObject(s->hbmp); |
| if (s->source_hdc) |
| DeleteDC(s->source_hdc); |
| |
| return 0; |
| } |
| |
| #define OFFSET(x) offsetof(struct gdigrab, x) |
| #define DEC AV_OPT_FLAG_DECODING_PARAM |
| static const AVOption options[] = { |
| { "draw_mouse", "draw the mouse pointer", OFFSET(draw_mouse), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, DEC }, |
| { "show_region", "draw border around capture area", OFFSET(show_region), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC }, |
| { "framerate", "set video frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "ntsc"}, 0, 0, DEC }, |
| { "video_size", "set video frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC }, |
| { "offset_x", "capture area x offset", OFFSET(offset_x), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC }, |
| { "offset_y", "capture area y offset", OFFSET(offset_y), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC }, |
| { NULL }, |
| }; |
| |
| static const AVClass gdigrab_class = { |
| .class_name = "GDIgrab indev", |
| .item_name = av_default_item_name, |
| .option = options, |
| .version = LIBAVUTIL_VERSION_INT, |
| }; |
| |
| /** gdi grabber device demuxer declaration */ |
| AVInputFormat ff_gdigrab_demuxer = { |
| .name = "gdigrab", |
| .long_name = NULL_IF_CONFIG_SMALL("GDI API Windows frame grabber"), |
| .priv_data_size = sizeof(struct gdigrab), |
| .read_header = gdigrab_read_header, |
| .read_packet = gdigrab_read_packet, |
| .read_close = gdigrab_read_close, |
| .flags = AVFMT_NOFILE, |
| .priv_class = &gdigrab_class, |
| }; |
