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;
100 av_log(s1, AV_LOG_ERROR, "AVParameters don't specify any device. Use -vd.\n");
104 param = strchr(ap->device, ':');
110 param = av_strdup(param);
111 offset = strchr(param, '+');
113 sscanf(offset, "%d,%d", &x_off, &y_off);
117 av_log(s1, AV_LOG_INFO, "device: %s -> display: %s x: %d y: %d width: %d height: %d\n", ap->device, param, x_off, y_off, ap->width, ap->height);
119 dpy = XOpenDisplay(param);
121 av_log(s1, AV_LOG_ERROR, "Could not open X display.\n");
125 if (!ap || ap->width <= 0 || ap->height <= 0 || ap->time_base.den <= 0) {
126 av_log(s1, AV_LOG_ERROR, "AVParameters don't have any video size. Use -s.\n");
130 st = av_new_stream(s1, 0);
134 av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
136 use_shm = XShmQueryExtension(dpy);
137 av_log(s1, AV_LOG_INFO, "shared memory extension %s found\n", use_shm ? "" : "not");
140 int scr = XDefaultScreen(dpy);
141 image = XShmCreateImage(dpy,
142 DefaultVisual(dpy, scr),
143 DefaultDepth(dpy, scr),
147 ap->width, ap->height);
148 x11grab->shminfo.shmid = shmget(IPC_PRIVATE,
149 image->bytes_per_line * image->height,
151 if (x11grab->shminfo.shmid == -1) {
152 av_log(s1, AV_LOG_ERROR, "Fatal: Can't get shared memory!\n");
155 x11grab->shminfo.shmaddr = image->data = shmat(x11grab->shminfo.shmid, 0, 0);
156 x11grab->shminfo.readOnly = False;
158 if (!XShmAttach(dpy, &x11grab->shminfo)) {
159 av_log(s1, AV_LOG_ERROR, "Fatal: Failed to attach shared memory!\n");
160 /* needs some better error subroutine :) */
164 image = XGetImage(dpy, RootWindow(dpy, DefaultScreen(dpy)),
166 ap->width,ap->height,
170 switch (image->bits_per_pixel) {
172 av_log (s1, AV_LOG_DEBUG, "8 bit palette\n");
173 input_pixfmt = PIX_FMT_PAL8;
176 if ( image->red_mask == 0xf800 &&
177 image->green_mask == 0x07e0 &&
178 image->blue_mask == 0x001f ) {
179 av_log (s1, AV_LOG_DEBUG, "16 bit RGB565\n");
180 input_pixfmt = PIX_FMT_RGB565;
181 } else if (image->red_mask == 0x7c00 &&
182 image->green_mask == 0x03e0 &&
183 image->blue_mask == 0x001f ) {
184 av_log(s1, AV_LOG_DEBUG, "16 bit RGB555\n");
185 input_pixfmt = PIX_FMT_RGB555;
187 av_log(s1, AV_LOG_ERROR, "RGB ordering at image depth %i not supported ... aborting\n", image->bits_per_pixel);
188 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);
193 if ( image->red_mask == 0xff0000 &&
194 image->green_mask == 0x00ff00 &&
195 image->blue_mask == 0x0000ff ) {
196 input_pixfmt = PIX_FMT_BGR24;
197 } else if ( image->red_mask == 0x0000ff &&
198 image->green_mask == 0x00ff00 &&
199 image->blue_mask == 0xff0000 ) {
200 input_pixfmt = PIX_FMT_RGB24;
202 av_log(s1, AV_LOG_ERROR,"rgb ordering at image depth %i not supported ... aborting\n", image->bits_per_pixel);
203 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);
209 GetColorInfo (image, &c_info);
210 if ( c_info.alpha_mask == 0xff000000 && image->green_mask == 0x0000ff00) {
211 /* byte order is relevant here, not endianness
212 * endianness is handled by avcodec, but atm no such thing
213 * as having ABGR, instead of ARGB in a word. Since we
214 * need this for Solaris/SPARC, but need to do the conversion
215 * for every frame we do it outside of this loop, cf. below
216 * this matches both ARGB32 and ABGR32 */
217 input_pixfmt = PIX_FMT_ARGB32;
219 av_log(s1, AV_LOG_ERROR,"image depth %i not supported ... aborting\n", image->bits_per_pixel);
223 input_pixfmt = PIX_FMT_RGBA32;
226 av_log(s1, AV_LOG_ERROR, "image depth %i not supported ... aborting\n", image->bits_per_pixel);
230 x11grab->frame_size = ap->width * ap->height * image->bits_per_pixel/8;
232 x11grab->width = ap->width;
233 x11grab->height = ap->height;
234 x11grab->time_base = ap->time_base;
235 x11grab->time_frame = av_gettime() / av_q2d(ap->time_base);
236 x11grab->x_off = x_off;
237 x11grab->y_off = y_off;
238 x11grab->image = image;
239 x11grab->use_shm = use_shm;
241 st->codec->codec_type = CODEC_TYPE_VIDEO;
242 st->codec->codec_id = CODEC_ID_RAWVIDEO;
243 st->codec->width = ap->width;
244 st->codec->height = ap->height;
245 st->codec->pix_fmt = input_pixfmt;
246 st->codec->time_base = ap->time_base;
247 st->codec->bit_rate = x11grab->frame_size * 1/av_q2d(ap->time_base) * 8;
253 * Get pointer coordinates from X11.
255 * @param x Integer where horizontal coordinate will be returned
256 * @param y Integer where vertical coordinate will be returned
257 * @param dpy X11 display from where pointer coordinates are retrieved
258 * @param s1 Context used for logging errors if necessary
261 get_pointer_coordinates(int *x, int *y, Display *dpy, AVFormatContext *s1)
263 Window mrootwindow, childwindow;
266 mrootwindow = DefaultRootWindow(dpy);
268 if (XQueryPointer(dpy, mrootwindow, &mrootwindow, &childwindow,
269 x, y, &dummy, &dummy, (unsigned int*)&dummy)) {
271 av_log(s1, AV_LOG_INFO, "couldn't find mouse pointer\n");
278 * Mouse painting helper function that applies an 'and' and 'or' mask pair to
279 * '*dst' pixel. It actually draws a mouse pointer pixel to grabbed frame.
281 * @param dst Destination pixel
282 * @param and Part of the mask that must be applied using a bitwise 'and'
284 * @param or Part of the mask that must be applied using a bitwise 'or'
286 * @param bits_per_pixel Bits per pixel used in the grabbed image
289 apply_masks(uint8_t *dst, int and, int or, int bits_per_pixel)
291 switch (bits_per_pixel) {
293 *(uint32_t*)dst = (*(uint32_t*)dst & and) | or;
296 *(uint16_t*)dst = (*(uint16_t*)dst & and) | or;
305 * Paints a mouse pointer in an X11 image.
307 * @param image Image where to paint the mouse pointer
308 * @param s context used to retrieve original grabbing rectangle
310 * @param x Mouse pointer coordinate
311 * @param y Mouse pointer coordinate
314 paint_mouse_pointer(XImage *image, x11_grab_t *s, int x, int y)
316 /* 16x20x1bpp bitmap for the black channel of the mouse pointer */
317 static const uint16_t const mousePointerBlack[] =
319 0x0000, 0x0003, 0x0005, 0x0009, 0x0011,
320 0x0021, 0x0041, 0x0081, 0x0101, 0x0201,
321 0x03c1, 0x0049, 0x0095, 0x0093, 0x0120,
322 0x0120, 0x0240, 0x0240, 0x0380, 0x0000
325 /* 16x20x1bpp bitmap for the white channel of the mouse pointer */
326 static const uint16_t const mousePointerWhite[] =
328 0x0000, 0x0000, 0x0002, 0x0006, 0x000e,
329 0x001e, 0x003e, 0x007e, 0x00fe, 0x01fe,
330 0x003e, 0x0036, 0x0062, 0x0060, 0x00c0,
331 0x00c0, 0x0180, 0x0180, 0x0000, 0x0000
334 int x_off = s->x_off;
335 int y_off = s->y_off;
336 int width = s->width;
337 int height = s->height;
339 if ( x - x_off >= 0 && x < width + x_off
340 && y - y_off >= 0 && y < height + y_off) {
341 uint8_t *im_data = (uint8_t*)image->data;
346 /* Select correct masks and pixel size */
347 if (image->bits_per_pixel == 8) {
350 masks = (image->red_mask|image->green_mask|image->blue_mask);
352 bytes_per_pixel = image->bits_per_pixel>>3;
354 /* Shift to right line */
355 im_data += image->bytes_per_line * (y - y_off);
356 /* Shift to right pixel in the line */
357 im_data += bytes_per_pixel * (x - x_off);
359 /* Draw the cursor - proper loop */
360 for (line = 0; line < FFMIN(20, (y_off + height) - y); line++) {
361 uint8_t *cursor = im_data;
366 bm_b = mousePointerBlack[line];
367 bm_w = mousePointerWhite[line];
369 for (column = 0; column < FFMIN(16, (x_off + width) - x); column++) {
370 apply_masks(cursor, ~(masks*(bm_b&1)), masks*(bm_w&1),
371 image->bits_per_pixel);
372 cursor += bytes_per_pixel;
376 im_data += image->bytes_per_line;
383 * Reads new data in the image structure.
385 * @param dpy X11 display to grab from
387 * @param image Image where the grab will be put
388 * @param x Top-Left grabbing rectangle horizontal coordinate
389 * @param y Top-Left grabbing rectangle vertical coordinate
390 * @return 0 if error, !0 if successful
393 xget_zpixmap(Display *dpy, Drawable d, XImage *image, int x, int y)
404 GetReq(GetImage, req);
406 /* First set up the standard stuff in the request */
410 req->width = image->width;
411 req->height = image->height;
412 req->planeMask = (unsigned int)AllPlanes;
413 req->format = ZPixmap;
415 if (!_XReply(dpy, (xReply *)&rep, 0, xFalse) || !rep.length) {
421 nbytes = (long)rep.length << 2;
422 _XReadPad(dpy, image->data, nbytes);
430 * Grabs a frame from x11 (public device demuxer API).
432 * @param s1 Context from avformat core
433 * @param pkt Packet holding the brabbed frame
434 * @return frame size in bytes
437 x11grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
439 x11_grab_t *s = s1->priv_data;
440 Display *dpy = s->dpy;
441 XImage *image = s->image;
442 int x_off = s->x_off;
443 int y_off = s->y_off;
445 int64_t curtime, delay;
448 /* Calculate the time of the next frame */
449 s->time_frame += INT64_C(1000000);
451 /* wait based on the frame rate */
453 curtime = av_gettime();
454 delay = s->time_frame * av_q2d(s->time_base) - curtime;
456 if (delay < INT64_C(-1000000) * av_q2d(s->time_base)) {
457 s->time_frame += INT64_C(1000000);
461 ts.tv_sec = delay / 1000000;
462 ts.tv_nsec = (delay % 1000000) * 1000;
463 nanosleep(&ts, NULL);
466 if (av_new_packet(pkt, s->frame_size) < 0) {
473 if (!XShmGetImage(dpy, RootWindow(dpy, DefaultScreen(dpy)), image, x_off, y_off, AllPlanes)) {
474 av_log (s1, AV_LOG_INFO, "XShmGetImage() failed\n");
477 if (!xget_zpixmap(dpy, RootWindow(dpy, DefaultScreen(dpy)), image, x_off, y_off)) {
478 av_log (s1, AV_LOG_INFO, "XGetZPixmap() failed\n");
483 int pointer_x, pointer_y;
484 get_pointer_coordinates(&pointer_x, &pointer_y, dpy, s1);
485 paint_mouse_pointer(image, s, pointer_x, pointer_y);
489 /* XXX: avoid memcpy */
490 memcpy(pkt->data, image->data, s->frame_size);
491 return s->frame_size;
495 * Closes x11 frame grabber (public device demuxer API).
497 * @param s1 Context from avformat core
498 * @return 0 success, !0 failure
501 x11grab_read_close(AVFormatContext *s1)
503 x11_grab_t *x11grab = s1->priv_data;
505 /* Detach cleanly from shared mem */
506 if (x11grab->use_shm) {
507 XShmDetach(x11grab->dpy, &x11grab->shminfo);
508 shmdt(x11grab->shminfo.shmaddr);
509 shmctl(x11grab->shminfo.shmid, IPC_RMID, NULL);
512 /* Destroy X11 image */
513 if (x11grab->image) {
514 XDestroyImage(x11grab->image);
515 x11grab->image = NULL;
518 /* Free X11 display */
519 XCloseDisplay(x11grab->dpy);
523 /** x11 grabber device demuxer declaration */
524 AVInputFormat x11_grab_device_demuxer =
533 .flags = AVFMT_NOFILE,