libavdevice/x11grab.c - third_party/ffmpeg - Git at Google

 /*
  * X11 video grab interface
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg integration:
  * Copyright (C) 2006 Clemens Fruhwirth <clemens@endorphin.org>
  *                    Edouard Gomez <ed.gomez@free.fr>
  *
  * This file contains code from grab.c:
  * Copyright (c) 2000-2001 Fabrice Bellard
  *
  * This file contains code from the xvidcap project:
  * Copyright (C) 1997-1998 Rasca, Berlin
  *               2003-2004 Karl H. Beckers, Frankfurt
  *
  * FFmpeg is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */

 /**
  * @file
  * X11 frame device demuxer by Clemens Fruhwirth <clemens@endorphin.org>
  * and Edouard Gomez <ed.gomez@free.fr>.
  */

 #define _XOPEN_SOURCE 600

 #include "config.h"
 #include "libavformat/avformat.h"
 #include <time.h>
 #include <X11/X.h>
 #include <X11/Xlib.h>
 #include <X11/Xlibint.h>
 #include <X11/Xproto.h>
 #include <X11/Xutil.h>
 #include <sys/shm.h>
 #include <X11/extensions/XShm.h>
 #include <X11/extensions/Xfixes.h>

 /**
  * X11 Device Demuxer context
  */
 struct x11_grab
 {
     int frame_size;          /**< Size in bytes of a grabbed frame */
     AVRational time_base;    /**< Time base */
     int64_t time_frame;      /**< Current time */

     int height;              /**< Height of the grab frame */
     int width;               /**< Width of the grab frame */
     int x_off;               /**< Horizontal top-left corner coordinate */
     int y_off;               /**< Vertical top-left corner coordinate */

     Display *dpy;            /**< X11 display from which x11grab grabs frames */
     XImage *image;           /**< X11 image holding the grab */
     int use_shm;             /**< !0 when using XShm extension */
     XShmSegmentInfo shminfo; /**< When using XShm, keeps track of XShm infos */
     int nomouse;
 };

 /**
  * Initializes the x11 grab device demuxer (public device demuxer API).
  *
  * @param s1 Context from avformat core
  * @param ap Parameters from avformat core
  * @return <ul>
  *          <li>AVERROR(ENOMEM) no memory left</li>
  *          <li>AVERROR(EIO) other failure case</li>
  *          <li>0 success</li>
  *         </ul>
  */
 static int
 x11grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
 {
     struct x11_grab *x11grab = s1->priv_data;
     Display *dpy;
     AVStream *st = NULL;
     enum PixelFormat input_pixfmt;
     XImage *image;
     int x_off = 0;
     int y_off = 0;
     int use_shm;
     char *param, *offset;

     param = av_strdup(s1->filename);
     offset = strchr(param, '+');
     if (offset) {
         sscanf(offset, "%d,%d", &x_off, &y_off);
         x11grab->nomouse= strstr(offset, "nomouse");
         *offset= 0;
     }

     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);

     dpy = XOpenDisplay(param);
     if(!dpy) {
         av_log(s1, AV_LOG_ERROR, "Could not open X display.\n");
         return AVERROR(EIO);
     }

     if (ap->width <= 0 || ap->height <= 0 || ap->time_base.den <= 0) {
         av_log(s1, AV_LOG_ERROR, "AVParameters don't have video size and/or rate. Use -s and -r.\n");
         return AVERROR(EIO);
     }

     st = av_new_stream(s1, 0);
     if (!st) {
         return AVERROR(ENOMEM);
     }
     av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */

     use_shm = XShmQueryExtension(dpy);
     av_log(s1, AV_LOG_INFO, "shared memory extension %s found\n", use_shm ? "" : "not");

     if(use_shm) {
         int scr = XDefaultScreen(dpy);
         image = XShmCreateImage(dpy,
                                 DefaultVisual(dpy, scr),
                                 DefaultDepth(dpy, scr),
                                 ZPixmap,
                                 NULL,
                                 &x11grab->shminfo,
                                 ap->width, ap->height);
         x11grab->shminfo.shmid = shmget(IPC_PRIVATE,
                                         image->bytes_per_line * image->height,
                                         IPC_CREAT|0777);
         if (x11grab->shminfo.shmid == -1) {
             av_log(s1, AV_LOG_ERROR, "Fatal: Can't get shared memory!\n");
             return AVERROR(ENOMEM);
         }
         x11grab->shminfo.shmaddr = image->data = shmat(x11grab->shminfo.shmid, 0, 0);
         x11grab->shminfo.readOnly = False;

         if (!XShmAttach(dpy, &x11grab->shminfo)) {
             av_log(s1, AV_LOG_ERROR, "Fatal: Failed to attach shared memory!\n");
             /* needs some better error subroutine :) */
             return AVERROR(EIO);
         }
     } else {
         image = XGetImage(dpy, RootWindow(dpy, DefaultScreen(dpy)),
                           x_off,y_off,
                           ap->width,ap->height,
                           AllPlanes, ZPixmap);
     }

     switch (image->bits_per_pixel) {
     case 8:
         av_log (s1, AV_LOG_DEBUG, "8 bit palette\n");
         input_pixfmt = PIX_FMT_PAL8;
         break;
     case 16:
         if (       image->red_mask   == 0xf800 &&
                    image->green_mask == 0x07e0 &&
                    image->blue_mask  == 0x001f ) {
             av_log (s1, AV_LOG_DEBUG, "16 bit RGB565\n");
             input_pixfmt = PIX_FMT_RGB565;
         } else if (image->red_mask   == 0x7c00 &&
                    image->green_mask == 0x03e0 &&
                    image->blue_mask  == 0x001f ) {
             av_log(s1, AV_LOG_DEBUG, "16 bit RGB555\n");
             input_pixfmt = PIX_FMT_RGB555;
         } else {
             av_log(s1, AV_LOG_ERROR, "RGB ordering at image depth %i not supported ... aborting\n", image->bits_per_pixel);
             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);
             return AVERROR(EIO);
         }
         break;
     case 24:
         if (        image->red_mask   == 0xff0000 &&
                     image->green_mask == 0x00ff00 &&
                     image->blue_mask  == 0x0000ff ) {
             input_pixfmt = PIX_FMT_BGR24;
         } else if ( image->red_mask   == 0x0000ff &&
                     image->green_mask == 0x00ff00 &&
                     image->blue_mask  == 0xff0000 ) {
             input_pixfmt = PIX_FMT_RGB24;
         } else {
             av_log(s1, AV_LOG_ERROR,"rgb ordering at image depth %i not supported ... aborting\n", image->bits_per_pixel);
             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);
             return AVERROR(EIO);
         }
         break;
     case 32:
 #if 0
         GetColorInfo (image, &c_info);
         if ( c_info.alpha_mask == 0xff000000 && image->green_mask == 0x0000ff00) {
             /* byte order is relevant here, not endianness
              * endianness is handled by avcodec, but atm no such thing
              * as having ABGR, instead of ARGB in a word. Since we
              * need this for Solaris/SPARC, but need to do the conversion
              * for every frame we do it outside of this loop, cf. below
              * this matches both ARGB32 and ABGR32 */
             input_pixfmt = PIX_FMT_ARGB32;
         }  else {
             av_log(s1, AV_LOG_ERROR,"image depth %i not supported ... aborting\n", image->bits_per_pixel);
             return AVERROR(EIO);
         }
 #endif
         input_pixfmt = PIX_FMT_RGB32;
         break;
     default:
         av_log(s1, AV_LOG_ERROR, "image depth %i not supported ... aborting\n", image->bits_per_pixel);
         return -1;
     }

     x11grab->frame_size = ap->width * ap->height * image->bits_per_pixel/8;
     x11grab->dpy = dpy;
     x11grab->width = ap->width;
     x11grab->height = ap->height;
     x11grab->time_base  = ap->time_base;
     x11grab->time_frame = av_gettime() / av_q2d(ap->time_base);
     x11grab->x_off = x_off;
     x11grab->y_off = y_off;
     x11grab->image = image;
     x11grab->use_shm = use_shm;

     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
     st->codec->codec_id = CODEC_ID_RAWVIDEO;
     st->codec->width = ap->width;
     st->codec->height = ap->height;
     st->codec->pix_fmt = input_pixfmt;
     st->codec->time_base = ap->time_base;
     st->codec->bit_rate = x11grab->frame_size * 1/av_q2d(ap->time_base) * 8;

     return 0;
 }

 /**
  * Paints a mouse pointer in an X11 image.
  *
  * @param image image to paint the mouse pointer to
  * @param s context used to retrieve original grabbing rectangle
  *          coordinates
  * @param x Mouse pointer coordinate
  * @param y Mouse pointer coordinate
  */
 static void
 paint_mouse_pointer(XImage *image, struct x11_grab *s)
 {
     int x_off = s->x_off;
     int y_off = s->y_off;
     int width = s->width;
     int height = s->height;
     Display *dpy = s->dpy;
     XFixesCursorImage *xcim;
     int x, y;
     int line, column;
     int to_line, to_column;
     int image_addr, xcim_addr;

     xcim = XFixesGetCursorImage(dpy);;

     x = xcim->x - xcim->xhot;
     y = xcim->y - xcim->yhot;

     to_line = FFMIN((y + xcim->height), (height + y_off));
     to_column = FFMIN((x + xcim->width), (width + x_off));

     for (line = FFMAX(y, y_off); line < to_line; line++) {
         for (column = FFMAX(x, x_off); column < to_column; column++) {
             xcim_addr = (line - y) * xcim->width + column - x;

             if ((unsigned char)(xcim->pixels[xcim_addr] >> 24) != 0) { // skip fully transparent pixel
                 image_addr = ((line - y_off) * width + column - x_off) * 4;

                 image->data[image_addr] = (unsigned char)(xcim->pixels[xcim_addr] >> 0);
                 image->data[image_addr+1] = (unsigned char)(xcim->pixels[xcim_addr] >> 8);
                 image->data[image_addr+2] = (unsigned char)(xcim->pixels[xcim_addr] >> 16);
             }
         }
     }

     XFree(xcim);
     xcim = NULL;
 }


 /**
  * Reads new data in the image structure.
  *
  * @param dpy X11 display to grab from
  * @param d
  * @param image Image where the grab will be put
  * @param x Top-Left grabbing rectangle horizontal coordinate
  * @param y Top-Left grabbing rectangle vertical coordinate
  * @return 0 if error, !0 if successful
  */
 static int
 xget_zpixmap(Display *dpy, Drawable d, XImage *image, int x, int y)
 {
     xGetImageReply rep;
     xGetImageReq *req;
     long nbytes;

     if (!image) {
         return 0;
     }

     LockDisplay(dpy);
     GetReq(GetImage, req);

     /* First set up the standard stuff in the request */
     req->drawable = d;
     req->x = x;
     req->y = y;
     req->width = image->width;
     req->height = image->height;
     req->planeMask = (unsigned int)AllPlanes;
     req->format = ZPixmap;

     if (!_XReply(dpy, (xReply *)&rep, 0, xFalse) || !rep.length) {
         UnlockDisplay(dpy);
         SyncHandle();
         return 0;
     }

     nbytes = (long)rep.length << 2;
     _XReadPad(dpy, image->data, nbytes);

     UnlockDisplay(dpy);
     SyncHandle();
     return 1;
 }

 /**
  * Grabs a frame from x11 (public device demuxer API).
  *
  * @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 x11_grab *s = s1->priv_data;
     Display *dpy = s->dpy;
     XImage *image = s->image;
     int x_off = s->x_off;
     int y_off = s->y_off;

     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);
     }

     if (av_new_packet(pkt, s->frame_size) < 0) {
         return AVERROR(EIO);
     }

     pkt->pts = curtime;

     if(s->use_shm) {
         if (!XShmGetImage(dpy, RootWindow(dpy, DefaultScreen(dpy)), image, x_off, y_off, AllPlanes)) {
             av_log (s1, AV_LOG_INFO, "XShmGetImage() failed\n");
         }
     } else {
         if (!xget_zpixmap(dpy, RootWindow(dpy, DefaultScreen(dpy)), image, x_off, y_off)) {
             av_log (s1, AV_LOG_INFO, "XGetZPixmap() failed\n");
         }
     }

     if(!s->nomouse){
         paint_mouse_pointer(image, s);
     }


     /* XXX: avoid memcpy */
     memcpy(pkt->data, image->data, s->frame_size);
     return s->frame_size;
 }

 /**
  * Closes 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 x11_grab *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;
     }

     /* Free X11 display */
     XCloseDisplay(x11grab->dpy);
     return 0;
 }

 /** x11 grabber device demuxer declaration */
 AVInputFormat x11_grab_device_demuxer =
 {
     "x11grab",
     NULL_IF_CONFIG_SMALL("X11grab"),
     sizeof(struct x11_grab),
     NULL,
     x11grab_read_header,
     x11grab_read_packet,
     x11grab_read_close,
     .flags = AVFMT_NOFILE,
 };
	/*
	* X11 video grab interface
	*
	* This file is part of FFmpeg.
	*
	* FFmpeg integration:
	* Copyright (C) 2006 Clemens Fruhwirth <clemens@endorphin.org>
	* Edouard Gomez <ed.gomez@free.fr>
	*
	* This file contains code from grab.c:
	* Copyright (c) 2000-2001 Fabrice Bellard
	*
	* This file contains code from the xvidcap project:
	* Copyright (C) 1997-1998 Rasca, Berlin
	* 2003-2004 Karl H. Beckers, Frankfurt
	*
	* FFmpeg is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* FFmpeg is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with FFmpeg; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	/**
	* @file
	* X11 frame device demuxer by Clemens Fruhwirth <clemens@endorphin.org>
	* and Edouard Gomez <ed.gomez@free.fr>.
	*/

	#define _XOPEN_SOURCE 600

	#include "config.h"
	#include "libavformat/avformat.h"
	#include <time.h>
	#include <X11/X.h>
	#include <X11/Xlib.h>
	#include <X11/Xlibint.h>
	#include <X11/Xproto.h>
	#include <X11/Xutil.h>
	#include <sys/shm.h>
	#include <X11/extensions/XShm.h>
	#include <X11/extensions/Xfixes.h>

	/**
	* X11 Device Demuxer context
	*/
	struct x11_grab
	{
	int frame_size; /*< Size in bytes of a grabbed frame /
	AVRational time_base; /*< Time base /
	int64_t time_frame; /*< Current time /

	int height; /*< Height of the grab frame /
	int width; /*< Width of the grab frame /
	int x_off; /*< Horizontal top-left corner coordinate /
	int y_off; /*< Vertical top-left corner coordinate /

	Display dpy; /< X11 display from which x11grab grabs frames /
	XImage image; /< X11 image holding the grab /
	int use_shm; /*< !0 when using XShm extension /
	XShmSegmentInfo shminfo; /*< When using XShm, keeps track of XShm infos /
	int nomouse;
	};

	/**
	* Initializes the x11 grab device demuxer (public device demuxer API).
	*
	* @param s1 Context from avformat core
	* @param ap Parameters from avformat core
	* @return <ul>
	* <li>AVERROR(ENOMEM) no memory left</li>
	* <li>AVERROR(EIO) other failure case</li>
	* <li>0 success</li>
	* </ul>
	*/
	static int
	x11grab_read_header(AVFormatContext s1, AVFormatParameters ap)
	{
	struct x11_grab *x11grab = s1->priv_data;
	Display *dpy;
	AVStream *st = NULL;
	enum PixelFormat input_pixfmt;
	XImage *image;
	int x_off = 0;
	int y_off = 0;
	int use_shm;
	char param, offset;

	param = av_strdup(s1->filename);
	offset = strchr(param, '+');
	if (offset) {
	sscanf(offset, "%d,%d", &x_off, &y_off);
	x11grab->nomouse= strstr(offset, "nomouse");
	*offset= 0;
	}

	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);

	dpy = XOpenDisplay(param);
	if(!dpy) {
	av_log(s1, AV_LOG_ERROR, "Could not open X display.\n");
	return AVERROR(EIO);
	}

	if (ap->width <= 0 \|\| ap->height <= 0 \|\| ap->time_base.den <= 0) {
	av_log(s1, AV_LOG_ERROR, "AVParameters don't have video size and/or rate. Use -s and -r.\n");
	return AVERROR(EIO);
	}

	st = av_new_stream(s1, 0);
	if (!st) {
	return AVERROR(ENOMEM);
	}
	av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */

	use_shm = XShmQueryExtension(dpy);
	av_log(s1, AV_LOG_INFO, "shared memory extension %s found\n", use_shm ? "" : "not");

	if(use_shm) {
	int scr = XDefaultScreen(dpy);
	image = XShmCreateImage(dpy,
	DefaultVisual(dpy, scr),
	DefaultDepth(dpy, scr),
	ZPixmap,
	NULL,
	&x11grab->shminfo,
	ap->width, ap->height);
	x11grab->shminfo.shmid = shmget(IPC_PRIVATE,
	image->bytes_per_line * image->height,
	IPC_CREAT\|0777);
	if (x11grab->shminfo.shmid == -1) {
	av_log(s1, AV_LOG_ERROR, "Fatal: Can't get shared memory!\n");
	return AVERROR(ENOMEM);
	}
	x11grab->shminfo.shmaddr = image->data = shmat(x11grab->shminfo.shmid, 0, 0);
	x11grab->shminfo.readOnly = False;

	if (!XShmAttach(dpy, &x11grab->shminfo)) {
	av_log(s1, AV_LOG_ERROR, "Fatal: Failed to attach shared memory!\n");
	/* needs some better error subroutine :) */
	return AVERROR(EIO);
	}
	} else {
	image = XGetImage(dpy, RootWindow(dpy, DefaultScreen(dpy)),
	x_off,y_off,
	ap->width,ap->height,
	AllPlanes, ZPixmap);
	}

	switch (image->bits_per_pixel) {
	case 8:
	av_log (s1, AV_LOG_DEBUG, "8 bit palette\n");
	input_pixfmt = PIX_FMT_PAL8;
	break;
	case 16:
	if ( image->red_mask == 0xf800 &&
	image->green_mask == 0x07e0 &&
	image->blue_mask == 0x001f ) {
	av_log (s1, AV_LOG_DEBUG, "16 bit RGB565\n");
	input_pixfmt = PIX_FMT_RGB565;
	} else if (image->red_mask == 0x7c00 &&
	image->green_mask == 0x03e0 &&
	image->blue_mask == 0x001f ) {
	av_log(s1, AV_LOG_DEBUG, "16 bit RGB555\n");
	input_pixfmt = PIX_FMT_RGB555;
	} else {
	av_log(s1, AV_LOG_ERROR, "RGB ordering at image depth %i not supported ... aborting\n", image->bits_per_pixel);
	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);
	return AVERROR(EIO);
	}
	break;
	case 24:
	if ( image->red_mask == 0xff0000 &&
	image->green_mask == 0x00ff00 &&
	image->blue_mask == 0x0000ff ) {
	input_pixfmt = PIX_FMT_BGR24;
	} else if ( image->red_mask == 0x0000ff &&
	image->green_mask == 0x00ff00 &&
	image->blue_mask == 0xff0000 ) {
	input_pixfmt = PIX_FMT_RGB24;
	} else {
	av_log(s1, AV_LOG_ERROR,"rgb ordering at image depth %i not supported ... aborting\n", image->bits_per_pixel);
	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);
	return AVERROR(EIO);
	}
	break;
	case 32:
	#if 0
	GetColorInfo (image, &c_info);
	if ( c_info.alpha_mask == 0xff000000 && image->green_mask == 0x0000ff00) {
	/* byte order is relevant here, not endianness
	* endianness is handled by avcodec, but atm no such thing
	* as having ABGR, instead of ARGB in a word. Since we
	* need this for Solaris/SPARC, but need to do the conversion
	* for every frame we do it outside of this loop, cf. below
	* this matches both ARGB32 and ABGR32 */
	input_pixfmt = PIX_FMT_ARGB32;
	} else {
	av_log(s1, AV_LOG_ERROR,"image depth %i not supported ... aborting\n", image->bits_per_pixel);
	return AVERROR(EIO);
	}
	#endif
	input_pixfmt = PIX_FMT_RGB32;
	break;
	default:
	av_log(s1, AV_LOG_ERROR, "image depth %i not supported ... aborting\n", image->bits_per_pixel);
	return -1;
	}

	x11grab->frame_size = ap->width * ap->height * image->bits_per_pixel/8;
	x11grab->dpy = dpy;
	x11grab->width = ap->width;
	x11grab->height = ap->height;
	x11grab->time_base = ap->time_base;
	x11grab->time_frame = av_gettime() / av_q2d(ap->time_base);
	x11grab->x_off = x_off;
	x11grab->y_off = y_off;
	x11grab->image = image;
	x11grab->use_shm = use_shm;

	st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
	st->codec->codec_id = CODEC_ID_RAWVIDEO;
	st->codec->width = ap->width;
	st->codec->height = ap->height;
	st->codec->pix_fmt = input_pixfmt;
	st->codec->time_base = ap->time_base;
	st->codec->bit_rate = x11grab->frame_size * 1/av_q2d(ap->time_base) * 8;

	return 0;
	}

	/**
	* Paints a mouse pointer in an X11 image.
	*
	* @param image image to paint the mouse pointer to
	* @param s context used to retrieve original grabbing rectangle
	* coordinates
	* @param x Mouse pointer coordinate
	* @param y Mouse pointer coordinate
	*/
	static void
	paint_mouse_pointer(XImage image, struct x11_grab s)
	{
	int x_off = s->x_off;
	int y_off = s->y_off;
	int width = s->width;
	int height = s->height;
	Display *dpy = s->dpy;
	XFixesCursorImage *xcim;
	int x, y;
	int line, column;
	int to_line, to_column;
	int image_addr, xcim_addr;

	xcim = XFixesGetCursorImage(dpy);;

	x = xcim->x - xcim->xhot;
	y = xcim->y - xcim->yhot;

	to_line = FFMIN((y + xcim->height), (height + y_off));
	to_column = FFMIN((x + xcim->width), (width + x_off));

	for (line = FFMAX(y, y_off); line < to_line; line++) {
	for (column = FFMAX(x, x_off); column < to_column; column++) {
	xcim_addr = (line - y) * xcim->width + column - x;

	if ((unsigned char)(xcim->pixels[xcim_addr] >> 24) != 0) { // skip fully transparent pixel
	image_addr = ((line - y_off) * width + column - x_off) * 4;

	image->data[image_addr] = (unsigned char)(xcim->pixels[xcim_addr] >> 0);
	image->data[image_addr+1] = (unsigned char)(xcim->pixels[xcim_addr] >> 8);
	image->data[image_addr+2] = (unsigned char)(xcim->pixels[xcim_addr] >> 16);
	}
	}
	}

	XFree(xcim);
	xcim = NULL;
	}


	/**
	* Reads new data in the image structure.
	*
	* @param dpy X11 display to grab from
	* @param d
	* @param image Image where the grab will be put
	* @param x Top-Left grabbing rectangle horizontal coordinate
	* @param y Top-Left grabbing rectangle vertical coordinate
	* @return 0 if error, !0 if successful
	*/
	static int
	xget_zpixmap(Display dpy, Drawable d, XImage image, int x, int y)
	{
	xGetImageReply rep;
	xGetImageReq *req;
	long nbytes;

	if (!image) {
	return 0;
	}

	LockDisplay(dpy);
	GetReq(GetImage, req);

	/* First set up the standard stuff in the request */
	req->drawable = d;
	req->x = x;
	req->y = y;
	req->width = image->width;
	req->height = image->height;
	req->planeMask = (unsigned int)AllPlanes;
	req->format = ZPixmap;

	if (!_XReply(dpy, (xReply *)&rep, 0, xFalse) \|\| !rep.length) {
	UnlockDisplay(dpy);
	SyncHandle();
	return 0;
	}

	nbytes = (long)rep.length << 2;
	_XReadPad(dpy, image->data, nbytes);

	UnlockDisplay(dpy);
	SyncHandle();
	return 1;
	}

	/**
	* Grabs a frame from x11 (public device demuxer API).
	*
	* @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 x11_grab *s = s1->priv_data;
	Display *dpy = s->dpy;
	XImage *image = s->image;
	int x_off = s->x_off;
	int y_off = s->y_off;

	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);
	}

	if (av_new_packet(pkt, s->frame_size) < 0) {
	return AVERROR(EIO);
	}

	pkt->pts = curtime;

	if(s->use_shm) {
	if (!XShmGetImage(dpy, RootWindow(dpy, DefaultScreen(dpy)), image, x_off, y_off, AllPlanes)) {
	av_log (s1, AV_LOG_INFO, "XShmGetImage() failed\n");
	}
	} else {
	if (!xget_zpixmap(dpy, RootWindow(dpy, DefaultScreen(dpy)), image, x_off, y_off)) {
	av_log (s1, AV_LOG_INFO, "XGetZPixmap() failed\n");
	}
	}

	if(!s->nomouse){
	paint_mouse_pointer(image, s);
	}


	/* XXX: avoid memcpy */
	memcpy(pkt->data, image->data, s->frame_size);
	return s->frame_size;
	}

	/**
	* Closes 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 x11_grab *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;
	}

	/* Free X11 display */
	XCloseDisplay(x11grab->dpy);
	return 0;
	}

	/** x11 grabber device demuxer declaration */
	AVInputFormat x11_grab_device_demuxer =
	{
	"x11grab",
	NULL_IF_CONFIG_SMALL("X11grab"),
	sizeof(struct x11_grab),
	NULL,
	x11grab_read_header,
	x11grab_read_packet,
	x11grab_read_close,
	.flags = AVFMT_NOFILE,
	};