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