649 lines
22 KiB
C
649 lines
22 KiB
C
/*
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* X11 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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* FFmpeg integration:
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* Copyright (C) 2006 Clemens Fruhwirth <clemens@endorphin.org>
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* Edouard Gomez <ed.gomez@free.fr>
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*
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* This file contains code from grab.c:
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* Copyright (c) 2000-2001 Fabrice Bellard
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*
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* This file contains code from the xvidcap project:
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* Copyright (C) 1997-1998 Rasca, Berlin
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* 2003-2004 Karl H. Beckers, Frankfurt
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*
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* FFmpeg is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* 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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* X11 frame device demuxer
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* @author Clemens Fruhwirth <clemens@endorphin.org>
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* @author Edouard Gomez <ed.gomez@free.fr>
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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/log.h"
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#include "libavutil/opt.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/time.h"
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#include <time.h>
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#include <X11/cursorfont.h>
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#include <X11/X.h>
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#include <X11/Xlib.h>
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#include <X11/Xlibint.h>
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#include <X11/Xproto.h>
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#include <X11/Xutil.h>
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#include <sys/shm.h>
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#include <X11/extensions/shape.h>
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#include <X11/extensions/XShm.h>
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#include <X11/extensions/Xfixes.h>
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#include "avdevice.h"
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/**
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* X11 Device Demuxer context
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*/
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struct x11grab {
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const AVClass *class; /**< Class for private options. */
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int frame_size; /**< Size in bytes of a grabbed frame */
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AVRational time_base; /**< Time base */
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int64_t time_frame; /**< Current time */
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int width; /**< Width of the grab frame */
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int height; /**< Height of the grab frame */
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int x_off; /**< Horizontal top-left corner coordinate */
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int y_off; /**< Vertical top-left corner coordinate */
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Display *dpy; /**< X11 display from which x11grab grabs frames */
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XImage *image; /**< X11 image holding the grab */
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int use_shm; /**< !0 when using XShm extension */
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XShmSegmentInfo shminfo; /**< When using XShm, keeps track of XShm infos */
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int draw_mouse; /**< Set by a private option. */
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int follow_mouse; /**< Set by a private option. */
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int show_region; /**< set by a private option. */
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AVRational framerate; /**< Set by a private option. */
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int palette_changed;
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uint32_t palette[256];
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Cursor c;
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Window region_win; /**< This is used by show_region option. */
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};
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#define REGION_WIN_BORDER 3
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/**
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* Draw grabbing region window
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*
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* @param s x11grab context
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*/
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static void
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x11grab_draw_region_win(struct x11grab *s)
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{
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Display *dpy = s->dpy;
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int screen;
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Window win = s->region_win;
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GC gc;
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screen = DefaultScreen(dpy);
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gc = XCreateGC(dpy, win, 0, 0);
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XSetForeground(dpy, gc, WhitePixel(dpy, screen));
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XSetBackground(dpy, gc, BlackPixel(dpy, screen));
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XSetLineAttributes(dpy, gc, REGION_WIN_BORDER, LineDoubleDash, 0, 0);
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XDrawRectangle(dpy, win, gc,
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1, 1,
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(s->width + REGION_WIN_BORDER * 2) - 1 * 2 - 1,
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(s->height + REGION_WIN_BORDER * 2) - 1 * 2 - 1);
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XFreeGC(dpy, gc);
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}
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/**
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* Initialize grabbing region window
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*
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* @param s x11grab context
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*/
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static void
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x11grab_region_win_init(struct x11grab *s)
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{
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Display *dpy = s->dpy;
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int screen;
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XSetWindowAttributes attribs;
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XRectangle rect;
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screen = DefaultScreen(dpy);
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attribs.override_redirect = True;
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s->region_win = XCreateWindow(dpy, RootWindow(dpy, screen),
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s->x_off - REGION_WIN_BORDER,
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s->y_off - REGION_WIN_BORDER,
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s->width + REGION_WIN_BORDER * 2,
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s->height + REGION_WIN_BORDER * 2,
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0, CopyFromParent,
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InputOutput, CopyFromParent,
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CWOverrideRedirect, &attribs);
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rect.x = 0;
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rect.y = 0;
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rect.width = s->width;
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rect.height = s->height;
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XShapeCombineRectangles(dpy, s->region_win,
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ShapeBounding, REGION_WIN_BORDER, REGION_WIN_BORDER,
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&rect, 1, ShapeSubtract, 0);
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XMapWindow(dpy, s->region_win);
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XSelectInput(dpy, s->region_win, ExposureMask | StructureNotifyMask);
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x11grab_draw_region_win(s);
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}
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/**
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* Initialize the x11 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 <ul>
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* <li>AVERROR(ENOMEM) no memory left</li>
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* <li>AVERROR(EIO) other failure case</li>
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* <li>0 success</li>
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* </ul>
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*/
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static int
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x11grab_read_header(AVFormatContext *s1)
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{
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struct x11grab *x11grab = s1->priv_data;
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Display *dpy;
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AVStream *st = NULL;
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enum AVPixelFormat input_pixfmt;
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XImage *image;
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int x_off = 0;
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int y_off = 0;
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int screen;
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int use_shm;
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char *dpyname, *offset;
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int ret = 0;
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Colormap color_map;
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XColor color[256];
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int i;
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dpyname = av_strdup(s1->filename);
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if (!dpyname)
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goto out;
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offset = strchr(dpyname, '+');
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if (offset) {
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sscanf(offset, "%d,%d", &x_off, &y_off);
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if (strstr(offset, "nomouse")) {
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av_log(s1, AV_LOG_WARNING,
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"'nomouse' specification in argument is deprecated: "
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"use 'draw_mouse' option with value 0 instead\n");
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x11grab->draw_mouse = 0;
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}
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*offset= 0;
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}
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av_log(s1, AV_LOG_INFO, "device: %s -> display: %s x: %d y: %d width: %d height: %d\n",
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s1->filename, dpyname, x_off, y_off, x11grab->width, x11grab->height);
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dpy = XOpenDisplay(dpyname);
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av_freep(&dpyname);
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if(!dpy) {
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av_log(s1, AV_LOG_ERROR, "Could not open X display.\n");
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ret = AVERROR(EIO);
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goto out;
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}
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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 out;
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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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screen = DefaultScreen(dpy);
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if (x11grab->follow_mouse) {
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int screen_w, screen_h;
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Window w;
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screen_w = DisplayWidth(dpy, screen);
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screen_h = DisplayHeight(dpy, screen);
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XQueryPointer(dpy, RootWindow(dpy, screen), &w, &w, &x_off, &y_off, &ret, &ret, &ret);
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x_off -= x11grab->width / 2;
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y_off -= x11grab->height / 2;
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x_off = FFMIN(FFMAX(x_off, 0), screen_w - x11grab->width);
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y_off = FFMIN(FFMAX(y_off, 0), screen_h - x11grab->height);
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av_log(s1, AV_LOG_INFO, "followmouse is enabled, resetting grabbing region to x: %d y: %d\n", x_off, y_off);
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}
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use_shm = XShmQueryExtension(dpy);
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av_log(s1, AV_LOG_INFO, "shared memory extension%s found\n", use_shm ? "" : " not");
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if(use_shm) {
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int scr = XDefaultScreen(dpy);
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image = XShmCreateImage(dpy,
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DefaultVisual(dpy, scr),
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DefaultDepth(dpy, scr),
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ZPixmap,
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NULL,
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&x11grab->shminfo,
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x11grab->width, x11grab->height);
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x11grab->shminfo.shmid = shmget(IPC_PRIVATE,
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image->bytes_per_line * image->height,
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IPC_CREAT|0777);
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if (x11grab->shminfo.shmid == -1) {
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av_log(s1, AV_LOG_ERROR, "Fatal: Can't get shared memory!\n");
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ret = AVERROR(ENOMEM);
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goto out;
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}
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x11grab->shminfo.shmaddr = image->data = shmat(x11grab->shminfo.shmid, 0, 0);
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x11grab->shminfo.readOnly = False;
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if (!XShmAttach(dpy, &x11grab->shminfo)) {
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av_log(s1, AV_LOG_ERROR, "Fatal: Failed to attach shared memory!\n");
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/* needs some better error subroutine :) */
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ret = AVERROR(EIO);
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goto out;
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}
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} else {
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image = XGetImage(dpy, RootWindow(dpy, screen),
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x_off,y_off,
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x11grab->width, x11grab->height,
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AllPlanes, ZPixmap);
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}
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switch (image->bits_per_pixel) {
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case 8:
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av_log (s1, AV_LOG_DEBUG, "8 bit palette\n");
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input_pixfmt = AV_PIX_FMT_PAL8;
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color_map = DefaultColormap(dpy, screen);
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for (i = 0; i < 256; ++i)
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color[i].pixel = i;
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XQueryColors(dpy, color_map, color, 256);
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for (i = 0; i < 256; ++i)
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x11grab->palette[i] = (color[i].red & 0xFF00) << 8 |
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(color[i].green & 0xFF00) |
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(color[i].blue & 0xFF00) >> 8;
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x11grab->palette_changed = 1;
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break;
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case 16:
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if ( image->red_mask == 0xf800 &&
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image->green_mask == 0x07e0 &&
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image->blue_mask == 0x001f ) {
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av_log (s1, AV_LOG_DEBUG, "16 bit RGB565\n");
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input_pixfmt = AV_PIX_FMT_RGB565;
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} else if (image->red_mask == 0x7c00 &&
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image->green_mask == 0x03e0 &&
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image->blue_mask == 0x001f ) {
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av_log(s1, AV_LOG_DEBUG, "16 bit RGB555\n");
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input_pixfmt = AV_PIX_FMT_RGB555;
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} else {
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av_log(s1, AV_LOG_ERROR, "RGB ordering at image depth %i not supported ... aborting\n", image->bits_per_pixel);
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av_log(s1, AV_LOG_ERROR, "color masks: r 0x%.6lx g 0x%.6lx b 0x%.6lx\n", image->red_mask, image->green_mask, image->blue_mask);
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ret = AVERROR(EIO);
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goto out;
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}
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break;
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case 24:
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if ( image->red_mask == 0xff0000 &&
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image->green_mask == 0x00ff00 &&
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image->blue_mask == 0x0000ff ) {
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input_pixfmt = AV_PIX_FMT_BGR24;
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} else if ( image->red_mask == 0x0000ff &&
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image->green_mask == 0x00ff00 &&
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image->blue_mask == 0xff0000 ) {
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input_pixfmt = AV_PIX_FMT_RGB24;
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} else {
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av_log(s1, AV_LOG_ERROR,"rgb ordering at image depth %i not supported ... aborting\n", image->bits_per_pixel);
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av_log(s1, AV_LOG_ERROR, "color masks: r 0x%.6lx g 0x%.6lx b 0x%.6lx\n", image->red_mask, image->green_mask, image->blue_mask);
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ret = AVERROR(EIO);
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goto out;
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}
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break;
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case 32:
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input_pixfmt = AV_PIX_FMT_0RGB32;
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break;
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default:
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av_log(s1, AV_LOG_ERROR, "image depth %i not supported ... aborting\n", image->bits_per_pixel);
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ret = AVERROR(EINVAL);
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goto out;
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}
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x11grab->frame_size = x11grab->width * x11grab->height * image->bits_per_pixel/8;
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x11grab->dpy = dpy;
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x11grab->time_base = av_inv_q(x11grab->framerate);
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x11grab->time_frame = av_gettime() / av_q2d(x11grab->time_base);
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x11grab->x_off = x_off;
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x11grab->y_off = y_off;
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x11grab->image = image;
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x11grab->use_shm = use_shm;
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
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st->codec->width = x11grab->width;
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st->codec->height = x11grab->height;
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st->codec->pix_fmt = input_pixfmt;
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st->codec->time_base = x11grab->time_base;
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st->codec->bit_rate = x11grab->frame_size * 1/av_q2d(x11grab->time_base) * 8;
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out:
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av_free(dpyname);
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return ret;
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}
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/**
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* Paint a mouse pointer in an X11 image.
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*
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* @param image image to paint the mouse pointer to
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* @param s context used to retrieve original grabbing rectangle
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* coordinates
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*/
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static void
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paint_mouse_pointer(XImage *image, struct x11grab *s)
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{
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int x_off = s->x_off;
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int y_off = s->y_off;
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int width = s->width;
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int height = s->height;
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Display *dpy = s->dpy;
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XFixesCursorImage *xcim;
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int x, y;
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int line, column;
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int to_line, to_column;
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int pixstride = image->bits_per_pixel >> 3;
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/* Warning: in its insanity, xlib provides unsigned image data through a
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* char* pointer, so we have to make it uint8_t to make things not break.
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* Anyone who performs further investigation of the xlib API likely risks
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* permanent brain damage. */
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uint8_t *pix = image->data;
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Window w;
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XSetWindowAttributes attr;
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/* Code doesn't currently support 16-bit or PAL8 */
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if (image->bits_per_pixel != 24 && image->bits_per_pixel != 32)
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return;
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if(!s->c)
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s->c = XCreateFontCursor(dpy, XC_left_ptr);
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w = DefaultRootWindow(dpy);
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attr.cursor = s->c;
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XChangeWindowAttributes(dpy, w, CWCursor, &attr);
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xcim = XFixesGetCursorImage(dpy);
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x = xcim->x - xcim->xhot;
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y = xcim->y - xcim->yhot;
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to_line = FFMIN((y + xcim->height), (height + y_off));
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to_column = FFMIN((x + xcim->width), (width + x_off));
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for (line = FFMAX(y, y_off); line < to_line; line++) {
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for (column = FFMAX(x, x_off); column < to_column; column++) {
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int xcim_addr = (line - y) * xcim->width + column - x;
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int image_addr = ((line - y_off) * width + column - x_off) * pixstride;
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int r = (uint8_t)(xcim->pixels[xcim_addr] >> 0);
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int g = (uint8_t)(xcim->pixels[xcim_addr] >> 8);
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int b = (uint8_t)(xcim->pixels[xcim_addr] >> 16);
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int a = (uint8_t)(xcim->pixels[xcim_addr] >> 24);
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if (a == 255) {
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pix[image_addr+0] = r;
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pix[image_addr+1] = g;
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pix[image_addr+2] = b;
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} else if (a) {
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/* pixel values from XFixesGetCursorImage come premultiplied by alpha */
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pix[image_addr+0] = r + (pix[image_addr+0]*(255-a) + 255/2) / 255;
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pix[image_addr+1] = g + (pix[image_addr+1]*(255-a) + 255/2) / 255;
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pix[image_addr+2] = b + (pix[image_addr+2]*(255-a) + 255/2) / 255;
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}
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}
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}
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XFree(xcim);
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xcim = NULL;
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}
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/**
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* Read new data in the image structure.
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*
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* @param dpy X11 display to grab from
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* @param d
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* @param image Image where the grab will be put
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* @param x Top-Left grabbing rectangle horizontal coordinate
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* @param y Top-Left grabbing rectangle vertical coordinate
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* @return 0 if error, !0 if successful
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*/
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static int
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xget_zpixmap(Display *dpy, Drawable d, XImage *image, int x, int y)
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{
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xGetImageReply rep;
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xGetImageReq *req;
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long nbytes;
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if (!image) {
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return 0;
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}
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LockDisplay(dpy);
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GetReq(GetImage, req);
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/* First set up the standard stuff in the request */
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req->drawable = d;
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req->x = x;
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req->y = y;
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req->width = image->width;
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req->height = image->height;
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req->planeMask = (unsigned int)AllPlanes;
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req->format = ZPixmap;
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if (!_XReply(dpy, (xReply *)&rep, 0, xFalse) || !rep.length) {
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UnlockDisplay(dpy);
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SyncHandle();
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return 0;
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}
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nbytes = (long)rep.length << 2;
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_XReadPad(dpy, image->data, nbytes);
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UnlockDisplay(dpy);
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SyncHandle();
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return 1;
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}
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/**
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* Grab a frame from x11 (public device demuxer API).
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*
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|
* @param s1 Context from avformat core
|
|
* @param pkt Packet holding the brabbed frame
|
|
* @return frame size in bytes
|
|
*/
|
|
static int
|
|
x11grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
|
|
{
|
|
struct x11grab *s = s1->priv_data;
|
|
Display *dpy = s->dpy;
|
|
XImage *image = s->image;
|
|
int x_off = s->x_off;
|
|
int y_off = s->y_off;
|
|
|
|
int screen;
|
|
Window root;
|
|
int follow_mouse = s->follow_mouse;
|
|
|
|
int64_t curtime, delay;
|
|
struct timespec ts;
|
|
|
|
/* Calculate the time of the next frame */
|
|
s->time_frame += INT64_C(1000000);
|
|
|
|
/* wait based on the frame rate */
|
|
for(;;) {
|
|
curtime = av_gettime();
|
|
delay = s->time_frame * av_q2d(s->time_base) - curtime;
|
|
if (delay <= 0) {
|
|
if (delay < INT64_C(-1000000) * av_q2d(s->time_base)) {
|
|
s->time_frame += INT64_C(1000000);
|
|
}
|
|
break;
|
|
}
|
|
ts.tv_sec = delay / 1000000;
|
|
ts.tv_nsec = (delay % 1000000) * 1000;
|
|
nanosleep(&ts, NULL);
|
|
}
|
|
|
|
av_init_packet(pkt);
|
|
pkt->data = image->data;
|
|
pkt->size = s->frame_size;
|
|
pkt->pts = curtime;
|
|
if (s->palette_changed) {
|
|
uint8_t *pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE,
|
|
AVPALETTE_SIZE);
|
|
if (!pal) {
|
|
av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");
|
|
} else {
|
|
memcpy(pal, s->palette, AVPALETTE_SIZE);
|
|
s->palette_changed = 0;
|
|
}
|
|
}
|
|
|
|
screen = DefaultScreen(dpy);
|
|
root = RootWindow(dpy, screen);
|
|
if (follow_mouse) {
|
|
int screen_w, screen_h;
|
|
int pointer_x, pointer_y, _;
|
|
Window w;
|
|
|
|
screen_w = DisplayWidth(dpy, screen);
|
|
screen_h = DisplayHeight(dpy, screen);
|
|
XQueryPointer(dpy, root, &w, &w, &pointer_x, &pointer_y, &_, &_, &_);
|
|
if (follow_mouse == -1) {
|
|
// follow the mouse, put it at center of grabbing region
|
|
x_off += pointer_x - s->width / 2 - x_off;
|
|
y_off += pointer_y - s->height / 2 - y_off;
|
|
} else {
|
|
// follow the mouse, but only move the grabbing region when mouse
|
|
// reaches within certain pixels to the edge.
|
|
if (pointer_x > x_off + s->width - follow_mouse) {
|
|
x_off += pointer_x - (x_off + s->width - follow_mouse);
|
|
} else if (pointer_x < x_off + follow_mouse)
|
|
x_off -= (x_off + follow_mouse) - pointer_x;
|
|
if (pointer_y > y_off + s->height - follow_mouse) {
|
|
y_off += pointer_y - (y_off + s->height - follow_mouse);
|
|
} else if (pointer_y < y_off + follow_mouse)
|
|
y_off -= (y_off + follow_mouse) - pointer_y;
|
|
}
|
|
// adjust grabbing region position if it goes out of screen.
|
|
s->x_off = x_off = FFMIN(FFMAX(x_off, 0), screen_w - s->width);
|
|
s->y_off = y_off = FFMIN(FFMAX(y_off, 0), screen_h - s->height);
|
|
|
|
if (s->show_region && s->region_win)
|
|
XMoveWindow(dpy, s->region_win,
|
|
s->x_off - REGION_WIN_BORDER,
|
|
s->y_off - REGION_WIN_BORDER);
|
|
}
|
|
|
|
if (s->show_region) {
|
|
if (s->region_win) {
|
|
XEvent evt;
|
|
// clean up the events, and do the initinal draw or redraw.
|
|
for (evt.type = NoEventMask; XCheckMaskEvent(dpy, ExposureMask | StructureNotifyMask, &evt); );
|
|
if (evt.type)
|
|
x11grab_draw_region_win(s);
|
|
} else {
|
|
x11grab_region_win_init(s);
|
|
}
|
|
}
|
|
|
|
if(s->use_shm) {
|
|
if (!XShmGetImage(dpy, root, image, x_off, y_off, AllPlanes)) {
|
|
av_log (s1, AV_LOG_INFO, "XShmGetImage() failed\n");
|
|
}
|
|
} else {
|
|
if (!xget_zpixmap(dpy, root, image, x_off, y_off)) {
|
|
av_log (s1, AV_LOG_INFO, "XGetZPixmap() failed\n");
|
|
}
|
|
}
|
|
|
|
if (s->draw_mouse) {
|
|
paint_mouse_pointer(image, s);
|
|
}
|
|
|
|
return s->frame_size;
|
|
}
|
|
|
|
/**
|
|
* Close x11 frame grabber (public device demuxer API).
|
|
*
|
|
* @param s1 Context from avformat core
|
|
* @return 0 success, !0 failure
|
|
*/
|
|
static int
|
|
x11grab_read_close(AVFormatContext *s1)
|
|
{
|
|
struct x11grab *x11grab = s1->priv_data;
|
|
|
|
/* Detach cleanly from shared mem */
|
|
if (x11grab->use_shm) {
|
|
XShmDetach(x11grab->dpy, &x11grab->shminfo);
|
|
shmdt(x11grab->shminfo.shmaddr);
|
|
shmctl(x11grab->shminfo.shmid, IPC_RMID, NULL);
|
|
}
|
|
|
|
/* Destroy X11 image */
|
|
if (x11grab->image) {
|
|
XDestroyImage(x11grab->image);
|
|
x11grab->image = NULL;
|
|
}
|
|
|
|
if (x11grab->region_win) {
|
|
XDestroyWindow(x11grab->dpy, x11grab->region_win);
|
|
}
|
|
|
|
/* Free X11 display */
|
|
XCloseDisplay(x11grab->dpy);
|
|
return 0;
|
|
}
|
|
|
|
#define OFFSET(x) offsetof(struct x11grab, 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 },
|
|
|
|
{ "follow_mouse", "move the grabbing region when the mouse pointer reaches within specified amount of pixels to the edge of region",
|
|
OFFSET(follow_mouse), AV_OPT_TYPE_INT, {.i64 = 0}, -1, INT_MAX, DEC, "follow_mouse" },
|
|
{ "centered", "keep the mouse pointer at the center of grabbing region when following",
|
|
0, AV_OPT_TYPE_CONST, {.i64 = -1}, INT_MIN, INT_MAX, DEC, "follow_mouse" },
|
|
|
|
{ "framerate", "set video frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "ntsc"}, 0, 0, DEC },
|
|
{ "show_region", "show the grabbing region", OFFSET(show_region), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC },
|
|
{ "video_size", "set video frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = "vga"}, 0, 0, DEC },
|
|
{ NULL },
|
|
};
|
|
|
|
static const AVClass x11_class = {
|
|
.class_name = "X11grab indev",
|
|
.item_name = av_default_item_name,
|
|
.option = options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
/** x11 grabber device demuxer declaration */
|
|
AVInputFormat ff_x11grab_demuxer = {
|
|
.name = "x11grab",
|
|
.long_name = NULL_IF_CONFIG_SMALL("X11grab"),
|
|
.priv_data_size = sizeof(struct x11grab),
|
|
.read_header = x11grab_read_header,
|
|
.read_packet = x11grab_read_packet,
|
|
.read_close = x11grab_read_close,
|
|
.flags = AVFMT_NOFILE,
|
|
.priv_class = &x11_class,
|
|
};
|