456 lines
14 KiB
C
456 lines
14 KiB
C
/*
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* X11 video grab interface
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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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* Libav 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 Libav; 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 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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* 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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* @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 = AVMEDIA_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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* 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 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 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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/* 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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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
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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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* Close 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 ff_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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