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440 lines
14 KiB
440 lines
14 KiB
/* |
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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 libavdevice/x11grab.c |
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* X11 frame device demuxer by Clemens Fruhwirth <clemens@endorphin.org> |
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* and Edouard Gomez <ed.gomez@free.fr>. |
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*/ |
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#define _XOPEN_SOURCE 600 |
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#include "config.h" |
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#include "libavformat/avformat.h" |
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#include <time.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/XShm.h> |
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#include <X11/extensions/Xfixes.h> |
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/** |
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* X11 Device Demuxer context |
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*/ |
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struct x11_grab |
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{ |
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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 height; /**< Height of the grab frame */ |
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int width; /**< Width 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 nomouse; |
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}; |
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/** |
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* Initializes 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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* @param ap Parameters 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, AVFormatParameters *ap) |
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{ |
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struct x11_grab *x11grab = s1->priv_data; |
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Display *dpy; |
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AVStream *st = NULL; |
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enum PixelFormat 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 use_shm; |
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char *param, *offset; |
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param = av_strdup(s1->filename); |
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offset = strchr(param, '+'); |
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if (offset) { |
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sscanf(offset, "%d,%d", &x_off, &y_off); |
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x11grab->nomouse= strstr(offset, "nomouse"); |
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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", s1->filename, param, x_off, y_off, ap->width, ap->height); |
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dpy = XOpenDisplay(param); |
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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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return AVERROR(EIO); |
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} |
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if (ap->width <= 0 || ap->height <= 0 || ap->time_base.den <= 0) { |
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av_log(s1, AV_LOG_ERROR, "AVParameters don't have video size and/or rate. Use -s and -r.\n"); |
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return AVERROR(EIO); |
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} |
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st = av_new_stream(s1, 0); |
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if (!st) { |
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return AVERROR(ENOMEM); |
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} |
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av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */ |
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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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ap->width, ap->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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return AVERROR(ENOMEM); |
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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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return AVERROR(EIO); |
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} |
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} else { |
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image = XGetImage(dpy, RootWindow(dpy, DefaultScreen(dpy)), |
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x_off,y_off, |
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ap->width,ap->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 = PIX_FMT_PAL8; |
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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 = 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 = 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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return AVERROR(EIO); |
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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 = 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 = 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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return AVERROR(EIO); |
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} |
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break; |
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case 32: |
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#if 0 |
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GetColorInfo (image, &c_info); |
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if ( c_info.alpha_mask == 0xff000000 && image->green_mask == 0x0000ff00) { |
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/* byte order is relevant here, not endianness |
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* endianness is handled by avcodec, but atm no such thing |
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* as having ABGR, instead of ARGB in a word. Since we |
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* need this for Solaris/SPARC, but need to do the conversion |
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* for every frame we do it outside of this loop, cf. below |
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* this matches both ARGB32 and ABGR32 */ |
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input_pixfmt = PIX_FMT_ARGB32; |
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} else { |
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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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return AVERROR(EIO); |
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} |
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#endif |
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input_pixfmt = PIX_FMT_RGB32; |
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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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return -1; |
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} |
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x11grab->frame_size = ap->width * ap->height * image->bits_per_pixel/8; |
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x11grab->dpy = dpy; |
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x11grab->width = ap->width; |
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x11grab->height = ap->height; |
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x11grab->time_base = ap->time_base; |
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x11grab->time_frame = av_gettime() / av_q2d(ap->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 = CODEC_TYPE_VIDEO; |
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st->codec->codec_id = CODEC_ID_RAWVIDEO; |
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st->codec->width = ap->width; |
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st->codec->height = ap->height; |
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st->codec->pix_fmt = input_pixfmt; |
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st->codec->time_base = ap->time_base; |
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st->codec->bit_rate = x11grab->frame_size * 1/av_q2d(ap->time_base) * 8; |
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return 0; |
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} |
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/** |
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* Paints 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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* @param x Mouse pointer coordinate |
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* @param y Mouse pointer coordinate |
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*/ |
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static void |
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paint_mouse_pointer(XImage *image, struct x11_grab *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 image_addr, xcim_addr; |
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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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xcim_addr = (line - y) * xcim->width + column - x; |
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if ((unsigned char)(xcim->pixels[xcim_addr] >> 24) != 0) { // skip fully transparent pixel |
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image_addr = ((line - y_off) * width + column - x_off) * 4; |
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image->data[image_addr] = (unsigned char)(xcim->pixels[xcim_addr] >> 0); |
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image->data[image_addr+1] = (unsigned char)(xcim->pixels[xcim_addr] >> 8); |
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image->data[image_addr+2] = (unsigned char)(xcim->pixels[xcim_addr] >> 16); |
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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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* Reads 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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* Grabs a frame from x11 (public device demuxer API). |
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* |
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* @param s1 Context from avformat core |
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* @param pkt Packet holding the brabbed frame |
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* @return frame size in bytes |
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*/ |
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static int |
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x11grab_read_packet(AVFormatContext *s1, AVPacket *pkt) |
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{ |
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struct x11_grab *s = s1->priv_data; |
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Display *dpy = s->dpy; |
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XImage *image = s->image; |
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int x_off = s->x_off; |
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int y_off = s->y_off; |
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int64_t curtime, delay; |
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struct timespec ts; |
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/* Calculate the time of the next frame */ |
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s->time_frame += INT64_C(1000000); |
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/* wait based on the frame rate */ |
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for(;;) { |
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curtime = av_gettime(); |
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delay = s->time_frame * av_q2d(s->time_base) - curtime; |
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if (delay <= 0) { |
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if (delay < INT64_C(-1000000) * av_q2d(s->time_base)) { |
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s->time_frame += INT64_C(1000000); |
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} |
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break; |
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} |
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ts.tv_sec = delay / 1000000; |
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ts.tv_nsec = (delay % 1000000) * 1000; |
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nanosleep(&ts, NULL); |
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} |
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if (av_new_packet(pkt, s->frame_size) < 0) { |
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return AVERROR(EIO); |
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} |
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pkt->pts = curtime; |
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if(s->use_shm) { |
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if (!XShmGetImage(dpy, RootWindow(dpy, DefaultScreen(dpy)), image, x_off, y_off, AllPlanes)) { |
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av_log (s1, AV_LOG_INFO, "XShmGetImage() failed\n"); |
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} |
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} else { |
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if (!xget_zpixmap(dpy, RootWindow(dpy, DefaultScreen(dpy)), image, x_off, y_off)) { |
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av_log (s1, AV_LOG_INFO, "XGetZPixmap() failed\n"); |
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} |
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} |
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if(!s->nomouse){ |
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paint_mouse_pointer(image, s); |
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} |
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/* XXX: avoid memcpy */ |
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memcpy(pkt->data, image->data, s->frame_size); |
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return s->frame_size; |
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} |
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/** |
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* Closes x11 frame grabber (public device demuxer API). |
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* |
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* @param s1 Context from avformat core |
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* @return 0 success, !0 failure |
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*/ |
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static int |
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x11grab_read_close(AVFormatContext *s1) |
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{ |
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struct x11_grab *x11grab = s1->priv_data; |
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/* Detach cleanly from shared mem */ |
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if (x11grab->use_shm) { |
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XShmDetach(x11grab->dpy, &x11grab->shminfo); |
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shmdt(x11grab->shminfo.shmaddr); |
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shmctl(x11grab->shminfo.shmid, IPC_RMID, NULL); |
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} |
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/* Destroy X11 image */ |
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if (x11grab->image) { |
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XDestroyImage(x11grab->image); |
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x11grab->image = NULL; |
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} |
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/* Free X11 display */ |
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XCloseDisplay(x11grab->dpy); |
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return 0; |
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} |
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/** x11 grabber device demuxer declaration */ |
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AVInputFormat x11_grab_device_demuxer = |
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{ |
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"x11grab", |
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NULL_IF_CONFIG_SMALL("X11grab"), |
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sizeof(struct x11_grab), |
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NULL, |
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x11grab_read_header, |
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x11grab_read_packet, |
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x11grab_read_close, |
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.flags = AVFMT_NOFILE, |
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};
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