2 * X11 video grab interface
4 * This file is part of FFmpeg.
7 * Copyright (C) 2006 Clemens Fruhwirth <clemens@endorphin.org>
8 * Edouard Gomez <ed.gomez@free.fr>
10 * This file contains code from grab.c:
11 * Copyright (c) 2000-2001 Fabrice Bellard
13 * This file contains code from the xvidcap project:
14 * Copyright (C) 1997-1998 Rasca, Berlin
15 * 2003-2004 Karl H. Beckers, Frankfurt
17 * FFmpeg is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation; either version 2 of the License, or
20 * (at your option) any later version.
22 * FFmpeg is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
27 * You should have received a copy of the GNU General Public License along
28 * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
29 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
34 * X11 frame device demuxer by Clemens Fruhwirth <clemens@endorphin.org>
35 * and Edouard Gomez <ed.gomez@free.fr>.
41 #include <sys/ioctl.h>
44 #define _LINUX_TIME_H 1
48 #include <X11/Xlibint.h>
49 #include <X11/Xproto.h>
50 #include <X11/Xutil.h>
53 #include <X11/extensions/XShm.h>
56 * X11 Device Demuxer context
58 typedef struct x11_grab_s
60 int frame_size; /**< Size in bytes of a grabbed frame */
61 AVRational time_base; /**< Time base */
62 int64_t time_frame; /**< Current time */
64 int height; /**< Height of the grab frame */
65 int width; /**< Width of the grab frame */
66 int x_off; /**< Horizontal top-left corner coordinate */
67 int y_off; /**< Vertical top-left corner coordinate */
69 Display *dpy; /**< X11 display from which x11grab grabs frames */
70 XImage *image; /**< X11 image holding the grab */
71 int use_shm; /**< !0 when using XShm extension */
72 XShmSegmentInfo shminfo; /**< When using XShm, keeps track of XShm infos */
76 * Initializes the x11 grab device demuxer (public device demuxer API).
78 * @param s1 Context from avformat core
79 * @param ap Parameters from avformat core
81 * <li>ENOMEM no memory left</li>
82 * <li>AVERROR_IO other failure case</li>
87 x11grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
89 x11_grab_t *x11grab = s1->priv_data;
98 dpy = XOpenDisplay(NULL);
104 sscanf(ap->device, "x11:%d,%d", &x_off, &y_off);
105 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);
107 if (!ap || ap->width <= 0 || ap->height <= 0 || ap->time_base.den <= 0) {
108 av_log(s1, AV_LOG_ERROR, "AVParameters don't have any video size. Use -s.\n");
112 st = av_new_stream(s1, 0);
116 av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
118 use_shm = XShmQueryExtension(dpy);
119 av_log(s1, AV_LOG_INFO, "shared memory extension %s found\n", use_shm ? "" : "not");
122 int scr = XDefaultScreen(dpy);
123 image = XShmCreateImage(dpy,
124 DefaultVisual(dpy, scr),
125 DefaultDepth(dpy, scr),
129 ap->width, ap->height);
130 x11grab->shminfo.shmid = shmget(IPC_PRIVATE,
131 image->bytes_per_line * image->height,
133 if (x11grab->shminfo.shmid == -1) {
134 av_log(s1, AV_LOG_ERROR, "Fatal: Can't get shared memory!\n");
137 x11grab->shminfo.shmaddr = image->data = shmat(x11grab->shminfo.shmid, 0, 0);
138 x11grab->shminfo.readOnly = False;
140 if (!XShmAttach(dpy, &x11grab->shminfo)) {
141 av_log(s1, AV_LOG_ERROR, "Fatal: Failed to attach shared memory!\n");
142 /* needs some better error subroutine :) */
146 image = XGetImage(dpy, RootWindow(dpy, DefaultScreen(dpy)),
148 ap->width,ap->height,
152 switch (image->bits_per_pixel) {
154 av_log (s1, AV_LOG_DEBUG, "8 bit pallete\n");
155 input_pixfmt = PIX_FMT_PAL8;
158 if ( image->red_mask == 0xf800 &&
159 image->green_mask == 0x07e0 &&
160 image->blue_mask == 0x001f ) {
161 av_log (s1, AV_LOG_DEBUG, "16 bit RGB565\n");
162 input_pixfmt = PIX_FMT_RGB565;
163 } else if (image->red_mask == 0x7c00 &&
164 image->green_mask == 0x03e0 &&
165 image->blue_mask == 0x001f ) {
166 av_log(s1, AV_LOG_DEBUG, "16 bit RGB555\n");
167 input_pixfmt = PIX_FMT_RGB555;
169 av_log(s1, AV_LOG_ERROR, "RGB ordering at image depth %i not supported ... aborting\n", image->bits_per_pixel);
170 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);
175 if ( image->red_mask == 0xff0000 &&
176 image->green_mask == 0x00ff00 &&
177 image->blue_mask == 0x0000ff ) {
178 input_pixfmt = PIX_FMT_BGR24;
179 } else if ( image->red_mask == 0x0000ff &&
180 image->green_mask == 0x00ff00 &&
181 image->blue_mask == 0xff0000 ) {
182 input_pixfmt = PIX_FMT_RGB24;
184 av_log(s1, AV_LOG_ERROR,"rgb ordering at image depth %i not supported ... aborting\n", image->bits_per_pixel);
185 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);
191 GetColorInfo (image, &c_info);
192 if ( c_info.alpha_mask == 0xff000000 && image->green_mask == 0x0000ff00) {
193 /* byte order is relevant here, not endianness
194 * endianness is handled by avcodec, but atm no such thing
195 * as having ABGR, instead of ARGB in a word. Since we
196 * need this for Solaris/SPARC, but need to do the conversion
197 * for every frame we do it outside of this loop, cf. below
198 * this matches both ARGB32 and ABGR32 */
199 input_pixfmt = PIX_FMT_ARGB32;
201 av_log(s1, AV_LOG_ERROR,"image depth %i not supported ... aborting\n", image->bits_per_pixel);
205 input_pixfmt = PIX_FMT_RGBA32;
208 av_log(s1, AV_LOG_ERROR, "image depth %i not supported ... aborting\n", image->bits_per_pixel);
212 x11grab->frame_size = ap->width * ap->height * image->bits_per_pixel/8;
214 x11grab->width = ap->width;
215 x11grab->height = ap->height;
216 x11grab->time_base = ap->time_base;
217 x11grab->time_frame = av_gettime() / av_q2d(ap->time_base);
218 x11grab->x_off = x_off;
219 x11grab->y_off = y_off;
220 x11grab->image = image;
221 x11grab->use_shm = use_shm;
223 st->codec->codec_type = CODEC_TYPE_VIDEO;
224 st->codec->codec_id = CODEC_ID_RAWVIDEO;
225 st->codec->width = ap->width;
226 st->codec->height = ap->height;
227 st->codec->pix_fmt = input_pixfmt;
228 st->codec->time_base = ap->time_base;
229 st->codec->bit_rate = x11grab->frame_size * 1/av_q2d(ap->time_base) * 8;
235 * Get pointer coordinates from X11.
237 * @param x Integer where horizontal coordinate will be returned
238 * @param y Integer where vertical coordinate will be returned
239 * @param dpy X11 display from where pointer coordinates are retrieved
240 * @param s1 Context used for logging errors if necessary
243 get_pointer_coordinates(int *x, int *y, Display *dpy, AVFormatContext *s1)
245 Window mrootwindow, childwindow;
248 mrootwindow = DefaultRootWindow(dpy);
250 if (XQueryPointer(dpy, mrootwindow, &mrootwindow, &childwindow,
251 x, y, &dummy, &dummy, (unsigned int*)&dummy)) {
253 av_log(s1, AV_LOG_INFO, "couldn't find mouse pointer\n");
260 * Mouse painting helper function that applies an 'and' and 'or' mask pair to
261 * '*dst' pixel. It actually draws a mouse pointer pixel to grabbed frame.
263 * @param dst Destination pixel
264 * @param and Part of the mask that must be applied using a bitwise 'and'
266 * @param or Part of the mask that must be applied using a bitwise 'or'
268 * @param bits_per_pixel Bits per pixel used in the grabbed image
271 apply_masks(uint8_t *dst, int and, int or, int bits_per_pixel)
273 switch (bits_per_pixel) {
275 *(uint32_t*)dst = (*(uint32_t*)dst & and) | or;
278 *(uint16_t*)dst = (*(uint16_t*)dst & and) | or;
287 * Paints a mouse pointer in an X11 image.
289 * @param image Image where to paint the mouse pointer
290 * @param s context used to retrieve original grabbing rectangle
292 * @param x Mouse pointer coordinate
293 * @param y Mouse pointer coordinate
296 paint_mouse_pointer(XImage *image, x11_grab_t *s, int x, int y)
298 /* 16x20x1bpp bitmap for the black channel of the mouse pointer */
299 static const uint16_t const mousePointerBlack[] =
301 0x0000, 0x0003, 0x0005, 0x0009, 0x0011,
302 0x0021, 0x0041, 0x0081, 0x0101, 0x0201,
303 0x03c1, 0x0049, 0x0095, 0x0093, 0x0120,
304 0x0120, 0x0240, 0x0240, 0x0380, 0x0000
307 /* 16x20x1bpp bitmap for the white channel of the mouse pointer */
308 static const uint16_t const mousePointerWhite[] =
310 0x0000, 0x0000, 0x0002, 0x0006, 0x000e,
311 0x001e, 0x003e, 0x007e, 0x00fe, 0x01fe,
312 0x003e, 0x0036, 0x0062, 0x0060, 0x00c0,
313 0x00c0, 0x0180, 0x0180, 0x0000, 0x0000
316 int x_off = s->x_off;
317 int y_off = s->y_off;
318 int width = s->width;
319 int height = s->height;
321 if ( x - x_off >= 0 && x < width + x_off
322 && y - y_off >= 0 && y < height + y_off) {
323 uint8_t *im_data = (uint8_t*)image->data;
328 /* Select correct masks and pixel size */
329 if (image->bits_per_pixel == 8) {
332 masks = (image->red_mask|image->green_mask|image->blue_mask);
334 bytes_per_pixel = image->bits_per_pixel>>3;
336 /* Shift to right line */
337 im_data += image->bytes_per_line * (y - y_off);
338 /* Shift to right pixel in the line */
339 im_data += bytes_per_pixel * (x - x_off);
341 /* Draw the cursor - proper loop */
342 for (line = 0; line < FFMIN(20, (y_off + height) - y); line++) {
343 uint8_t *cursor = im_data;
348 bm_b = mousePointerBlack[line];
349 bm_w = mousePointerWhite[line];
351 for (column = 0; column < FFMIN(16, (x_off + width) - x); column++) {
352 apply_masks(cursor, ~(masks*(bm_b&1)), masks*(bm_w&1),
353 image->bits_per_pixel);
354 cursor += bytes_per_pixel;
358 im_data += image->bytes_per_line;
365 * Reads new data in the image structure.
367 * @param dpy X11 display to grab from
369 * @param image Image where the grab will be put
370 * @param x Top-Left grabbing rectangle horizontal coordinate
371 * @param y Top-Left grabbing rectangle vertical coordinate
372 * @return 0 if error, !0 if successful
375 xget_zpixmap(Display *dpy, Drawable d, XImage *image, int x, int y)
386 GetReq(GetImage, req);
388 /* First set up the standard stuff in the request */
392 req->width = image->width;
393 req->height = image->height;
394 req->planeMask = (unsigned int)AllPlanes;
395 req->format = ZPixmap;
397 if (!_XReply(dpy, (xReply *)&rep, 0, xFalse) || !rep.length) {
403 nbytes = (long)rep.length << 2;
404 _XReadPad(dpy, image->data, nbytes);
412 * Grabs a frame from x11 (public device demuxer API).
414 * @param s1 Context from avformat core
415 * @param pkt Packet holding the brabbed frame
416 * @return frame size in bytes
419 x11grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
421 x11_grab_t *s = s1->priv_data;
422 Display *dpy = s->dpy;
423 XImage *image = s->image;
424 int x_off = s->x_off;
425 int y_off = s->y_off;
427 int64_t curtime, delay;
430 /* Calculate the time of the next frame */
431 s->time_frame += int64_t_C(1000000);
433 /* wait based on the frame rate */
435 curtime = av_gettime();
436 delay = s->time_frame * av_q2d(s->time_base) - curtime;
438 if (delay < int64_t_C(-1000000) * av_q2d(s->time_base)) {
439 s->time_frame += int64_t_C(1000000);
443 ts.tv_sec = delay / 1000000;
444 ts.tv_nsec = (delay % 1000000) * 1000;
445 nanosleep(&ts, NULL);
448 if (av_new_packet(pkt, s->frame_size) < 0) {
455 if (!XShmGetImage(dpy, RootWindow(dpy, DefaultScreen(dpy)), image, x_off, y_off, AllPlanes)) {
456 av_log (s1, AV_LOG_INFO, "XShmGetImage() failed\n");
459 if (!xget_zpixmap(dpy, RootWindow(dpy, DefaultScreen(dpy)), image, x_off, y_off)) {
460 av_log (s1, AV_LOG_INFO, "XGetZPixmap() failed\n");
465 int pointer_x, pointer_y;
466 get_pointer_coordinates(&pointer_x, &pointer_y, dpy, s1);
467 paint_mouse_pointer(image, s, pointer_x, pointer_y);
471 /* XXX: avoid memcpy */
472 memcpy(pkt->data, image->data, s->frame_size);
473 return s->frame_size;
477 * Closes x11 frame grabber (public device demuxer API).
479 * @param s1 Context from avformat core
480 * @return 0 success, !0 failure
483 x11grab_read_close(AVFormatContext *s1)
485 x11_grab_t *x11grab = s1->priv_data;
487 /* Detach cleanly from shared mem */
488 if (x11grab->use_shm) {
489 XShmDetach(x11grab->dpy, &x11grab->shminfo);
490 shmdt(x11grab->shminfo.shmaddr);
491 shmctl(x11grab->shminfo.shmid, IPC_RMID, NULL);
494 /* Destroy X11 image */
495 if (x11grab->image) {
496 XDestroyImage(x11grab->image);
497 x11grab->image = NULL;
500 /* Free X11 display */
501 XCloseDisplay(x11grab->dpy);
505 /** x11 grabber device demuxer declaration */
506 AVInputFormat x11_grab_device_demuxer =
515 .flags = AVFMT_NOFILE,