/* * X11 video grab interface * * This file is part of FFmpeg. * * FFmpeg integration: * Copyright (C) 2006 Clemens Fruhwirth * Edouard Gomez * * 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 x11grab.c * X11 frame device demuxer by Clemens Fruhwirth * and Edouard Gomez . */ #include "avformat.h" #include #include #include #include #include #define _LINUX_TIME_H 1 #include #include #include #include #include #include #include #include #include /** * X11 Device Demuxer context */ typedef struct x11_grab_s { 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 */ } x11_grab_t; /** * Initializes the x11 grab device demuxer (public device demuxer API). * * @param s1 Context from avformat core * @param ap Parameters from avformat core * @return
    *
  • ENOMEM no memory left
  • *
  • AVERROR_IO other failure case
  • *
  • 0 success
  • *
*/ static int x11grab_read_header(AVFormatContext *s1, AVFormatParameters *ap) { x11_grab_t *x11grab = s1->priv_data; Display *dpy; AVStream *st = NULL; int input_pixfmt; XImage *image; int x_off = 0; int y_off = 0; int use_shm; dpy = XOpenDisplay(NULL); if(!dpy) { av_free(st); return AVERROR_IO; } sscanf(ap->device, "x11:%d,%d", &x_off, &y_off); av_log(s1, AV_LOG_INFO, "device: %s -> x: %d y: %d width: %d height: %d\n", ap->device, x_off, y_off, ap->width, ap->height); if (!ap || ap->width <= 0 || ap->height <= 0 || ap->time_base.den <= 0) { av_log(s1, AV_LOG_ERROR, "AVParameters don't have any video size. Use -s.\n"); return AVERROR_IO; } st = av_new_stream(s1, 0); if (!st) { return -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 -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_IO; } } 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 pallete\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_IO; } 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_IO; } 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_IO; } #endif input_pixfmt = PIX_FMT_RGBA32; 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 = CODEC_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; } /** * Get pointer coordinates from X11. * * @param x Integer where horizontal coordinate will be returned * @param y Integer where vertical coordinate will be returned * @param dpy X11 display from where pointer coordinates are retrieved * @param s1 Context used for logging errors if necessary */ static void get_pointer_coordinates(int *x, int *y, Display *dpy, AVFormatContext *s1) { Window mrootwindow, childwindow; int dummy; mrootwindow = DefaultRootWindow(dpy); if (XQueryPointer(dpy, mrootwindow, &mrootwindow, &childwindow, x, y, &dummy, &dummy, (unsigned int*)&dummy)) { } else { av_log(s1, AV_LOG_INFO, "couldn't find mouse pointer\n"); *x = -1; *y = -1; } } /** * Mouse painting helper function that applies an 'and' and 'or' mask pair to * '*dst' pixel. It actually draws a mouse pointer pixel to grabbed frame. * * @param dst Destination pixel * @param and Part of the mask that must be applied using a bitwise 'and' * operator * @param or Part of the mask that must be applied using a bitwise 'or' * operator * @param bits_per_pixel Bits per pixel used in the grabbed image */ static void inline apply_masks(uint8_t *dst, int and, int or, int bits_per_pixel) { switch (bits_per_pixel) { case 32: *(uint32_t*)dst = (*(uint32_t*)dst & and) | or; break; case 16: *(uint16_t*)dst = (*(uint16_t*)dst & and) | or; break; case 8: *dst = !!or; break; } } /** * Paints a mouse pointer in an X11 image. * * @param image Image where to paint the mouse pointer * @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, x11_grab_t *s, int x, int y) { /* 16x20x1bpp bitmap for the black channel of the mouse pointer */ static const uint16_t const mousePointerBlack[] = { 0x0000, 0x0003, 0x0005, 0x0009, 0x0011, 0x0021, 0x0041, 0x0081, 0x0101, 0x0201, 0x03c1, 0x0049, 0x0095, 0x0093, 0x0120, 0x0120, 0x0240, 0x0240, 0x0380, 0x0000 }; /* 16x20x1bpp bitmap for the white channel of the mouse pointer */ static const uint16_t const mousePointerWhite[] = { 0x0000, 0x0000, 0x0002, 0x0006, 0x000e, 0x001e, 0x003e, 0x007e, 0x00fe, 0x01fe, 0x003e, 0x0036, 0x0062, 0x0060, 0x00c0, 0x00c0, 0x0180, 0x0180, 0x0000, 0x0000 }; int x_off = s->x_off; int y_off = s->y_off; int width = s->width; int height = s->height; if ( x - x_off >= 0 && x < width + x_off && y - y_off >= 0 && y < height + y_off) { uint8_t *im_data = (uint8_t*)image->data; int bytes_per_pixel; int line; int masks; /* Select correct masks and pixel size */ if (image->bits_per_pixel == 8) { masks = 1; } else { masks = (image->red_mask|image->green_mask|image->blue_mask); } bytes_per_pixel = image->bits_per_pixel>>3; /* Shift to right line */ im_data += image->bytes_per_line * (y - y_off); /* Shift to right pixel in the line */ im_data += bytes_per_pixel * (x - x_off); /* Draw the cursor - proper loop */ for (line = 0; line < FFMIN(20, (y_off + height) - y); line++) { uint8_t *cursor = im_data; int column; uint16_t bm_b; uint16_t bm_w; bm_b = mousePointerBlack[line]; bm_w = mousePointerWhite[line]; for (column = 0; column < FFMIN(16, (x_off + width) - x); column++) { apply_masks(cursor, ~(masks*(bm_b&1)), masks*(bm_w&1), image->bits_per_pixel); cursor += bytes_per_pixel; bm_b >>= 1; bm_w >>= 1; } im_data += image->bytes_per_line; } } } /** * 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) { x11_grab_t *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_t_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_t_C(-1000000) * av_q2d(s->time_base)) { s->time_frame += int64_t_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_IO; } 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"); } } { int pointer_x, pointer_y; get_pointer_coordinates(&pointer_x, &pointer_y, dpy, s1); paint_mouse_pointer(image, s, pointer_x, pointer_y); } /* 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) { x11_grab_t *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", "X11grab", sizeof(x11_grab_t), NULL, x11grab_read_header, x11grab_read_packet, x11grab_read_close, .flags = AVFMT_NOFILE, };