3 * Copyright (C) 2006 Zaheer Merali <zaheerabbas at merali dot org>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
22 * SECTION:element-ximagesrc
25 * This element captures your X Display and creates raw RGB video. It uses
26 * the XDamage extension if available to only capture areas of the screen that
27 * have changed since the last frame. It uses the XFixes extension if
28 * available to also capture your mouse pointer. By default it will fixate to
29 * 25 frames per second.
31 * ## Example pipelines
33 * gst-launch-1.0 ximagesrc ! video/x-raw,framerate=5/1 ! videoconvert ! theoraenc ! oggmux ! filesink location=desktop.ogg
34 * ]| Encodes your X display to an Ogg theora video at 5 frames per second.
41 #include "gstximagesrc.h"
47 #include <X11/Xutil.h>
50 #include <gst/gst-i18n-plugin.h>
51 #include <gst/video/video.h>
53 #include "gst/glib-compat-private.h"
55 GST_DEBUG_CATEGORY_STATIC (gst_debug_ximage_src);
56 #define GST_CAT_DEFAULT gst_debug_ximage_src
58 static GstStaticPadTemplate t =
59 GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
60 GST_STATIC_CAPS ("video/x-raw, "
61 "framerate = (fraction) [ 0, MAX ], "
62 "width = (int) [ 1, MAX ], " "height = (int) [ 1, MAX ], "
63 "pixel-aspect-ratio = (fraction) [ 0, MAX ]"));
80 #define gst_ximage_src_parent_class parent_class
81 G_DEFINE_TYPE (GstXImageSrc, gst_ximage_src, GST_TYPE_PUSH_SRC);
83 static GstCaps *gst_ximage_src_fixate (GstBaseSrc * bsrc, GstCaps * caps);
84 static void gst_ximage_src_clear_bufpool (GstXImageSrc * ximagesrc);
86 /* Called when a buffer is returned from the pipeline */
88 gst_ximage_src_return_buf (GstXImageSrc * ximagesrc, GstBuffer * ximage)
90 GstMetaXImage *meta = GST_META_XIMAGE_GET (ximage);
91 /* True will make dispose free the buffer, while false will keep it */
94 /* If our geometry changed we can't reuse that image. */
95 if ((meta->width != ximagesrc->width) || (meta->height != ximagesrc->height)) {
96 GST_DEBUG_OBJECT (ximagesrc,
97 "destroy image %p as its size changed %dx%d vs current %dx%d",
98 ximage, meta->width, meta->height, ximagesrc->width, ximagesrc->height);
99 g_mutex_lock (&ximagesrc->x_lock);
100 gst_ximageutil_ximage_destroy (ximagesrc->xcontext, ximage);
101 g_mutex_unlock (&ximagesrc->x_lock);
103 /* In that case we can reuse the image and add it to our image pool. */
104 GST_LOG_OBJECT (ximagesrc, "recycling image %p in pool", ximage);
105 /* need to increment the refcount again to recycle */
106 gst_buffer_ref (ximage);
107 g_mutex_lock (&ximagesrc->pool_lock);
108 GST_BUFFER_FLAGS (GST_BUFFER (ximage)) = 0; /* clear out any flags from the previous use */
109 ximagesrc->buffer_pool = g_slist_prepend (ximagesrc->buffer_pool, ximage);
110 g_mutex_unlock (&ximagesrc->pool_lock);
118 gst_ximage_src_find_window (GstXImageSrc * src, Window root, const char *name)
121 Window window = 0, root_return, parent_return;
122 unsigned int nchildren;
126 status = XFetchName (src->xcontext->disp, root, &tmpname);
127 if (status && !strcmp (name, tmpname))
131 XQueryTree (src->xcontext->disp, root, &root_return, &parent_return,
132 &children, &nchildren);
133 if (!status || !children)
136 for (n = 0; n < nchildren; ++n) {
137 window = gst_ximage_src_find_window (src, children[n], name);
147 gst_ximage_src_open_display (GstXImageSrc * s, const gchar * name)
149 g_return_val_if_fail (GST_IS_XIMAGE_SRC (s), FALSE);
151 if (s->xcontext != NULL)
154 g_mutex_lock (&s->x_lock);
155 s->xcontext = ximageutil_xcontext_get (GST_ELEMENT (s), name);
156 if (s->xcontext == NULL) {
157 g_mutex_unlock (&s->x_lock);
158 GST_ELEMENT_ERROR (s, RESOURCE, OPEN_READ,
159 ("Could not open X display for reading"),
160 ("NULL returned from getting xcontext"));
163 s->width = s->xcontext->width;
164 s->height = s->xcontext->height;
166 s->xwindow = s->xcontext->root;
167 if (s->xid != 0 || s->xname) {
169 XWindowAttributes attrs;
173 Bool coord_translated;
176 status = XGetWindowAttributes (s->xcontext->disp, s->xid, &attrs);
178 GST_DEBUG_OBJECT (s, "Found window XID %" G_GUINT64_FORMAT, s->xid);
182 GST_WARNING_OBJECT (s, "Failed to get window %" G_GUINT64_FORMAT
183 " attributes", s->xid);
188 GST_DEBUG_OBJECT (s, "Looking for window %s", s->xname);
189 window = gst_ximage_src_find_window (s, s->xcontext->root, s->xname);
191 GST_DEBUG_OBJECT (s, "Found window named %s, ", s->xname);
192 status = XGetWindowAttributes (s->xcontext->disp, window, &attrs);
197 GST_WARNING_OBJECT (s, "Failed to get window attributes for "
198 "window named %s", s->xname);
203 GST_INFO_OBJECT (s, "Using root window");
204 goto use_root_window;
207 g_assert (s->xwindow != 0);
208 s->width = attrs.width;
209 s->height = attrs.height;
211 coord_translated = XTranslateCoordinates (s->xcontext->disp, s->xwindow,
212 s->xcontext->root, 0, 0, &x, &y, &child);
213 if (coord_translated) {
221 GST_INFO_OBJECT (s, "Using default window size of %dx%d at location %d,%d",
222 s->width, s->height, s->x, s->y);
227 /* check if xfixes supported */
231 if (XFixesQueryExtension (s->xcontext->disp, &s->fixes_event_base,
233 s->have_xfixes = TRUE;
234 GST_DEBUG_OBJECT (s, "X Server supports XFixes");
237 GST_DEBUG_OBJECT (s, "X Server does not support XFixes");
242 /* check if xdamage is supported */
245 long evmask = NoEventMask;
247 s->have_xdamage = FALSE;
249 s->damage_copy_gc = None;
250 s->damage_region = None;
252 if (XDamageQueryExtension (s->xcontext->disp, &s->damage_event_base,
255 XDamageCreate (s->xcontext->disp, s->xwindow, XDamageReportNonEmpty);
256 if (s->damage != None) {
257 s->damage_region = XFixesCreateRegion (s->xcontext->disp, NULL, 0);
258 if (s->damage_region != None) {
261 GST_DEBUG_OBJECT (s, "Using XDamage extension");
262 values.subwindow_mode = IncludeInferiors;
263 s->damage_copy_gc = XCreateGC (s->xcontext->disp,
264 s->xwindow, GCSubwindowMode, &values);
265 XSelectInput (s->xcontext->disp, s->xwindow, evmask);
267 s->have_xdamage = TRUE;
269 XDamageDestroy (s->xcontext->disp, s->damage);
273 GST_DEBUG_OBJECT (s, "Could not attach to XDamage");
275 GST_DEBUG_OBJECT (s, "X Server does not have XDamage extension");
281 g_mutex_unlock (&s->x_lock);
283 if (s->xcontext == NULL)
290 gst_ximage_src_start (GstBaseSrc * basesrc)
292 GstXImageSrc *s = GST_XIMAGE_SRC (basesrc);
294 s->last_frame_no = -1;
297 gst_buffer_unref (GST_BUFFER_CAST (s->last_ximage));
298 s->last_ximage = NULL;
300 return gst_ximage_src_open_display (s, s->display_name);
304 gst_ximage_src_stop (GstBaseSrc * basesrc)
306 GstXImageSrc *src = GST_XIMAGE_SRC (basesrc);
309 if (src->last_ximage)
310 gst_buffer_unref (GST_BUFFER_CAST (src->last_ximage));
311 src->last_ximage = NULL;
314 gst_ximage_src_clear_bufpool (src);
317 if (src->cursor_image)
318 XFree (src->cursor_image);
319 src->cursor_image = NULL;
323 g_mutex_lock (&src->x_lock);
326 if (src->damage_copy_gc != None) {
327 XFreeGC (src->xcontext->disp, src->damage_copy_gc);
328 src->damage_copy_gc = None;
330 if (src->damage_region != None) {
331 XFixesDestroyRegion (src->xcontext->disp, src->damage_region);
332 src->damage_region = None;
334 if (src->damage != None) {
335 XDamageDestroy (src->xcontext->disp, src->damage);
340 ximageutil_xcontext_clear (src->xcontext);
341 src->xcontext = NULL;
342 g_mutex_unlock (&src->x_lock);
349 gst_ximage_src_unlock (GstBaseSrc * basesrc)
351 GstXImageSrc *src = GST_XIMAGE_SRC (basesrc);
353 /* Awaken the create() func if it's waiting on the clock */
354 GST_OBJECT_LOCK (src);
356 GST_DEBUG_OBJECT (src, "Waking up waiting clock");
357 gst_clock_id_unschedule (src->clock_id);
359 GST_OBJECT_UNLOCK (src);
365 gst_ximage_src_recalc (GstXImageSrc * src)
370 /* Maybe later we can check the display hasn't changed size */
371 /* We could use XQueryPointer to get only the current window. */
377 gst_ximage_is_pointer_in_region (GstXImageSrc * src)
379 Window window_returned;
382 unsigned int mask_return;
385 on_window = XQueryPointer (src->xcontext->disp, src->xwindow,
386 &window_returned, &window_returned, &root_x, &root_y, &win_x, &win_y,
389 return (on_window && (win_x >= src->startx) && (win_y >= src->starty) &&
390 (win_x < src->endx) && (win_y < src->endy));
396 composite_pixel (GstXContext * xcontext, guchar * dest, guchar * src)
404 gint r_shift, r_max, r_shift_out;
405 gint g_shift, g_max, g_shift_out;
406 gint b_shift, b_max, b_shift_out;
408 switch (xcontext->bpp) {
413 color = GUINT16_FROM_LE (*(guint16 *) (dest));
416 color = GUINT32_FROM_LE (*(guint32 *) (dest));
419 /* Should not reach here */
420 g_return_if_reached ();
423 /* possible optimisation:
424 * move the code that finds shift and max in the _link function */
425 for (r_shift = 0; !(xcontext->visual->red_mask & (1 << r_shift)); r_shift++);
426 for (g_shift = 0; !(xcontext->visual->green_mask & (1 << g_shift));
428 for (b_shift = 0; !(xcontext->visual->blue_mask & (1 << b_shift)); b_shift++);
430 for (r_shift_out = 0; !(xcontext->visual->red_mask & (1 << r_shift_out));
432 for (g_shift_out = 0; !(xcontext->visual->green_mask & (1 << g_shift_out));
434 for (b_shift_out = 0; !(xcontext->visual->blue_mask & (1 << b_shift_out));
438 r_max = (xcontext->visual->red_mask >> r_shift);
439 b_max = (xcontext->visual->blue_mask >> b_shift);
440 g_max = (xcontext->visual->green_mask >> g_shift);
442 #define RGBXXX_R(x) (((x)>>r_shift) & (r_max))
443 #define RGBXXX_G(x) (((x)>>g_shift) & (g_max))
444 #define RGBXXX_B(x) (((x)>>b_shift) & (b_max))
446 dr = (RGBXXX_R (color) * 255) / r_max;
447 dg = (RGBXXX_G (color) * 255) / g_max;
448 db = (RGBXXX_B (color) * 255) / b_max;
450 dr = (r * a + (0xff - a) * dr) / 0xff;
451 dg = (g * a + (0xff - a) * dg) / 0xff;
452 db = (b * a + (0xff - a) * db) / 0xff;
454 color = (((dr * r_max) / 255) << r_shift_out) +
455 (((dg * g_max) / 255) << g_shift_out) +
456 (((db * b_max) / 255) << b_shift_out);
458 switch (xcontext->bpp) {
463 *(guint16 *) (dest) = color;
466 *(guint32 *) (dest) = color;
469 g_warning ("bpp %d not supported\n", xcontext->bpp);
476 copy_buffer (GstBuffer * dest, GstBuffer * src)
480 gst_buffer_map (src, &map, GST_MAP_READ);
481 gst_buffer_fill (dest, 0, map.data, map.size);
482 gst_buffer_unmap (src, &map);
486 /* Retrieve an XImageSrcBuffer, preferably from our
487 * pool of existing images and populate it from the window */
489 gst_ximage_src_ximage_get (GstXImageSrc * ximagesrc)
491 GstBuffer *ximage = NULL;
494 g_mutex_lock (&ximagesrc->pool_lock);
495 while (ximagesrc->buffer_pool != NULL) {
496 ximage = ximagesrc->buffer_pool->data;
498 meta = GST_META_XIMAGE_GET (ximage);
500 ximagesrc->buffer_pool = g_slist_delete_link (ximagesrc->buffer_pool,
501 ximagesrc->buffer_pool);
503 if ((meta->width == ximagesrc->width) ||
504 (meta->height == ximagesrc->height))
507 gst_ximage_buffer_free (ximage);
510 g_mutex_unlock (&ximagesrc->pool_lock);
512 if (ximage == NULL) {
513 GST_DEBUG_OBJECT (ximagesrc, "creating image (%dx%d)",
514 ximagesrc->width, ximagesrc->height);
516 g_mutex_lock (&ximagesrc->x_lock);
517 ximage = gst_ximageutil_ximage_new (ximagesrc->xcontext,
518 GST_ELEMENT (ximagesrc), ximagesrc->width, ximagesrc->height,
519 (BufferReturnFunc) (gst_ximage_src_return_buf));
520 if (ximage == NULL) {
521 GST_ELEMENT_ERROR (ximagesrc, RESOURCE, WRITE, (NULL),
522 ("could not create a %dx%d ximage", ximagesrc->width,
524 g_mutex_unlock (&ximagesrc->x_lock);
528 g_mutex_unlock (&ximagesrc->x_lock);
531 g_return_val_if_fail (GST_IS_XIMAGE_SRC (ximagesrc), NULL);
533 meta = GST_META_XIMAGE_GET (ximage);
536 if (ximagesrc->have_xdamage && ximagesrc->use_damage &&
537 ximagesrc->last_ximage != NULL) {
539 gboolean have_damage = FALSE;
541 /* have_frame is TRUE when either the entire screen has been
542 * grabbed or when the last image has been copied */
543 gboolean have_frame = FALSE;
545 GST_DEBUG_OBJECT (ximagesrc, "Retrieving screen using XDamage");
548 XDamageNotifyEvent *damage_ev = (XDamageNotifyEvent *) (&ev);
550 if (XCheckTypedEvent (ximagesrc->xcontext->disp,
551 ximagesrc->damage_event_base + XDamageNotify, &ev) &&
552 damage_ev->level == XDamageReportNonEmpty) {
554 XDamageSubtract (ximagesrc->xcontext->disp, ximagesrc->damage, None,
555 ximagesrc->damage_region);
558 } while (XPending (ximagesrc->xcontext->disp));
564 /* Now copy out all of the damaged rectangles. */
566 XFixesFetchRegion (ximagesrc->xcontext->disp,
567 ximagesrc->damage_region, &nrects);
572 GST_LOG_OBJECT (ximagesrc,
573 "Copying from last frame ximage->size: %" G_GSIZE_FORMAT,
574 gst_buffer_get_size (ximage));
575 copy_buffer (ximage, ximagesrc->last_ximage);
578 for (i = 0; i < nrects; i++) {
579 GST_LOG_OBJECT (ximagesrc,
580 "Damaged sub-region @ %d,%d size %dx%d reported",
581 rects[i].x, rects[i].y, rects[i].width, rects[i].height);
583 /* if we only want a small area, clip this damage region to
585 if (ximagesrc->endx > ximagesrc->startx &&
586 ximagesrc->endy > ximagesrc->starty) {
587 /* see if damage area intersects */
588 if (rects[i].x + rects[i].width - 1 < ximagesrc->startx ||
589 rects[i].x > ximagesrc->endx) {
591 } else if (rects[i].y + rects[i].height - 1 < ximagesrc->starty ||
592 rects[i].y > ximagesrc->endy) {
595 /* find intersect region */
596 int startx, starty, width, height;
598 startx = (rects[i].x < ximagesrc->startx) ? ximagesrc->startx :
600 starty = (rects[i].y < ximagesrc->starty) ? ximagesrc->starty :
602 width = (rects[i].x + rects[i].width - 1 < ximagesrc->endx) ?
603 rects[i].x + rects[i].width - startx :
604 ximagesrc->endx - startx + 1;
605 height = (rects[i].y + rects[i].height - 1 < ximagesrc->endy) ?
606 rects[i].y + rects[i].height - starty : ximagesrc->endy -
609 GST_LOG_OBJECT (ximagesrc,
610 "Retrieving damaged sub-region @ %d,%d size %dx%d as intersect region",
611 startx, starty, width, height);
612 XGetSubImage (ximagesrc->xcontext->disp, ximagesrc->xwindow,
613 startx, starty, width, height, AllPlanes, ZPixmap,
614 meta->ximage, startx - ximagesrc->startx,
615 starty - ximagesrc->starty);
619 GST_LOG_OBJECT (ximagesrc,
620 "Retrieving damaged sub-region @ %d,%d size %dx%d",
621 rects[i].x, rects[i].y, rects[i].width, rects[i].height);
623 XGetSubImage (ximagesrc->xcontext->disp, ximagesrc->xwindow,
624 rects[i].x, rects[i].y,
625 rects[i].width, rects[i].height,
626 AllPlanes, ZPixmap, meta->ximage, rects[i].x, rects[i].y);
633 GST_LOG_OBJECT (ximagesrc,
634 "Copying from last frame ximage->size: %" G_GSIZE_FORMAT,
635 gst_buffer_get_size (ximage));
636 copy_buffer (ximage, ximagesrc->last_ximage);
639 /* re-get area where last mouse pointer was but only if in our clipping
641 if (ximagesrc->cursor_image) {
642 gint x, y, width, height;
644 x = ximagesrc->cursor_image->x - ximagesrc->cursor_image->xhot -
646 y = ximagesrc->cursor_image->y - ximagesrc->cursor_image->yhot -
648 width = ximagesrc->cursor_image->width;
649 height = ximagesrc->cursor_image->height;
651 /* bounds checking */
656 if (x + width > ximagesrc->xcontext->width)
657 width = ximagesrc->xcontext->width - x;
658 if (y + height > ximagesrc->xcontext->height)
659 height = ximagesrc->xcontext->height - y;
662 GST_DEBUG_OBJECT (ximagesrc,
663 "Cursor was at (%d,%d) width: %d, height: %d and our range is: (%d,%d) - (%d,%d)",
664 x, y, width, height, ximagesrc->startx, ximagesrc->starty,
665 ximagesrc->endx, ximagesrc->endy);
666 /* only get where cursor last was, if it is in our range */
667 if (ximagesrc->endx > ximagesrc->startx &&
668 ximagesrc->endy > ximagesrc->starty) {
670 if (x + width < ximagesrc->startx || x > ximagesrc->endx) {
672 } else if (y + height < ximagesrc->starty || y > ximagesrc->endy) {
675 /* find intersect region */
676 int startx, starty, iwidth, iheight;
678 startx = (x < ximagesrc->startx) ? ximagesrc->startx : x;
679 starty = (y < ximagesrc->starty) ? ximagesrc->starty : y;
680 iwidth = (x + width < ximagesrc->endx) ?
681 x + width - startx : ximagesrc->endx - startx;
682 iheight = (y + height < ximagesrc->endy) ?
683 y + height - starty : ximagesrc->endy - starty;
684 GST_DEBUG_OBJECT (ximagesrc, "Removing cursor from %d,%d", x, y);
685 XGetSubImage (ximagesrc->xcontext->disp, ximagesrc->xwindow,
686 startx, starty, iwidth, iheight, AllPlanes, ZPixmap,
687 meta->ximage, startx - ximagesrc->startx,
688 starty - ximagesrc->starty);
692 GST_DEBUG_OBJECT (ximagesrc, "Removing cursor from %d,%d", x, y);
693 XGetSubImage (ximagesrc->xcontext->disp, ximagesrc->xwindow,
694 x, y, width, height, AllPlanes, ZPixmap, meta->ximage, x, y);
704 if (ximagesrc->xcontext->use_xshm) {
705 GST_DEBUG_OBJECT (ximagesrc, "Retrieving screen using XShm");
706 XShmGetImage (ximagesrc->xcontext->disp, ximagesrc->xwindow,
707 meta->ximage, ximagesrc->startx, ximagesrc->starty, AllPlanes);
710 #endif /* HAVE_XSHM */
712 GST_DEBUG_OBJECT (ximagesrc, "Retrieving screen using XGetImage");
713 if (ximagesrc->remote) {
714 XGetSubImage (ximagesrc->xcontext->disp, ximagesrc->xwindow,
715 ximagesrc->startx, ximagesrc->starty, ximagesrc->width,
716 ximagesrc->height, AllPlanes, ZPixmap, meta->ximage, 0, 0);
719 XGetImage (ximagesrc->xcontext->disp, ximagesrc->xwindow,
720 ximagesrc->startx, ximagesrc->starty, ximagesrc->width,
721 ximagesrc->height, AllPlanes, ZPixmap);
729 if (ximagesrc->show_pointer && ximagesrc->have_xfixes
730 && gst_ximage_is_pointer_in_region (ximagesrc)) {
732 GST_DEBUG_OBJECT (ximagesrc, "Using XFixes to draw cursor");
734 if (ximagesrc->cursor_image)
735 XFree (ximagesrc->cursor_image);
736 ximagesrc->cursor_image = XFixesGetCursorImage (ximagesrc->xcontext->disp);
737 if (ximagesrc->cursor_image != NULL) {
738 int cx, cy, i, j, count;
739 int startx, starty, iwidth, iheight;
740 gboolean cursor_in_image = TRUE;
742 cx = ximagesrc->cursor_image->x - ximagesrc->cursor_image->xhot -
744 cy = ximagesrc->cursor_image->y - ximagesrc->cursor_image->yhot -
746 count = ximagesrc->cursor_image->width * ximagesrc->cursor_image->height;
748 /* only get where cursor last was, if it is in our range */
749 if (ximagesrc->endx > ximagesrc->startx &&
750 ximagesrc->endy > ximagesrc->starty) {
752 if (cx + ximagesrc->cursor_image->width < (int) ximagesrc->startx ||
753 cx > (int) ximagesrc->endx) {
755 cursor_in_image = FALSE;
756 } else if (cy + ximagesrc->cursor_image->height <
757 (int) ximagesrc->starty || cy > (int) ximagesrc->endy) {
759 cursor_in_image = FALSE;
761 /* find intersect region */
763 startx = (cx < (int) ximagesrc->startx) ? ximagesrc->startx : cx;
764 starty = (cy < (int) ximagesrc->starty) ? ximagesrc->starty : cy;
765 iwidth = (cx + ximagesrc->cursor_image->width < ximagesrc->endx) ?
766 cx + ximagesrc->cursor_image->width - startx :
767 ximagesrc->endx - startx;
769 (cy + ximagesrc->cursor_image->height <
770 ximagesrc->endy) ? cy + ximagesrc->cursor_image->height -
771 starty : ximagesrc->endy - starty;
776 iwidth = ximagesrc->cursor_image->width;
777 iheight = ximagesrc->cursor_image->height;
780 if (cursor_in_image) {
781 GST_DEBUG_OBJECT (ximagesrc, "Cursor is in image so trying to draw it");
782 for (i = 0; i < count; i++)
783 ximagesrc->cursor_image->pixels[i] =
784 GUINT_TO_LE (ximagesrc->cursor_image->pixels[i]);
785 /* copy those pixels across */
788 && j < ximagesrc->starty + ximagesrc->height; j++) {
791 && i < ximagesrc->startx + ximagesrc->width; i++) {
795 (guint8 *) & (ximagesrc->cursor_image->pixels[((j -
796 cy) * ximagesrc->cursor_image->width + (i - cx))]);
798 (guint8 *) & (meta->ximage->data[((j -
799 ximagesrc->starty) * ximagesrc->width + (i -
800 ximagesrc->startx)) *
801 (ximagesrc->xcontext->bpp / 8)]);
803 composite_pixel (ximagesrc->xcontext, (guint8 *) dest,
812 if (ximagesrc->have_xdamage && ximagesrc->use_damage) {
813 /* need to ref ximage to put in last_ximage */
814 gst_buffer_ref (ximage);
815 if (ximagesrc->last_ximage) {
816 gst_buffer_unref (ximagesrc->last_ximage);
818 ximagesrc->last_ximage = ximage;
819 GST_LOG_OBJECT (ximagesrc, "reffing current buffer for last_ximage");
826 gst_ximage_src_create (GstPushSrc * bs, GstBuffer ** buf)
828 GstXImageSrc *s = GST_XIMAGE_SRC (bs);
830 GstClockTime base_time;
831 GstClockTime next_capture_ts;
833 gint64 next_frame_no;
835 if (!gst_ximage_src_recalc (s)) {
836 GST_ELEMENT_ERROR (s, RESOURCE, FAILED,
837 (_("Changing resolution at runtime is not yet supported.")), (NULL));
838 return GST_FLOW_ERROR;
841 if (s->fps_n <= 0 || s->fps_d <= 0)
842 return GST_FLOW_NOT_NEGOTIATED; /* FPS must be > 0 */
844 /* Now, we might need to wait for the next multiple of the fps
845 * before capturing */
848 if (GST_ELEMENT_CLOCK (s) == NULL) {
849 GST_OBJECT_UNLOCK (s);
850 GST_ELEMENT_ERROR (s, RESOURCE, FAILED,
851 (_("Cannot operate without a clock")), (NULL));
852 return GST_FLOW_ERROR;
855 base_time = GST_ELEMENT_CAST (s)->base_time;
856 next_capture_ts = gst_clock_get_time (GST_ELEMENT_CLOCK (s));
857 next_capture_ts -= base_time;
859 /* Figure out which 'frame number' position we're at, based on the cur time
861 next_frame_no = gst_util_uint64_scale (next_capture_ts,
862 s->fps_n, GST_SECOND * s->fps_d);
863 if (next_frame_no == s->last_frame_no) {
867 /* Need to wait for the next frame */
870 /* Figure out what the next frame time is */
871 next_capture_ts = gst_util_uint64_scale (next_frame_no,
872 s->fps_d * GST_SECOND, s->fps_n);
874 id = gst_clock_new_single_shot_id (GST_ELEMENT_CLOCK (s),
875 next_capture_ts + base_time);
878 /* release the object lock while waiting */
879 GST_OBJECT_UNLOCK (s);
881 GST_DEBUG_OBJECT (s, "Waiting for next frame time %" G_GUINT64_FORMAT,
883 ret = gst_clock_id_wait (id, NULL);
886 gst_clock_id_unref (id);
888 if (ret == GST_CLOCK_UNSCHEDULED) {
889 /* Got woken up by the unlock function */
890 GST_OBJECT_UNLOCK (s);
891 return GST_FLOW_FLUSHING;
893 /* Duration is a complete 1/fps frame duration */
894 dur = gst_util_uint64_scale_int (GST_SECOND, s->fps_d, s->fps_n);
896 GstClockTime next_frame_ts;
898 GST_DEBUG_OBJECT (s, "No need to wait for next frame time %"
899 G_GUINT64_FORMAT " next frame = %" G_GINT64_FORMAT " prev = %"
900 G_GINT64_FORMAT, next_capture_ts, next_frame_no, s->last_frame_no);
901 next_frame_ts = gst_util_uint64_scale (next_frame_no + 1,
902 s->fps_d * GST_SECOND, s->fps_n);
903 /* Frame duration is from now until the next expected capture time */
904 dur = next_frame_ts - next_capture_ts;
906 s->last_frame_no = next_frame_no;
907 GST_OBJECT_UNLOCK (s);
909 image = gst_ximage_src_ximage_get (s);
911 return GST_FLOW_ERROR;
914 GST_BUFFER_DTS (*buf) = GST_CLOCK_TIME_NONE;
915 GST_BUFFER_PTS (*buf) = next_capture_ts;
916 GST_BUFFER_DURATION (*buf) = dur;
922 gst_ximage_src_set_property (GObject * object, guint prop_id,
923 const GValue * value, GParamSpec * pspec)
925 GstXImageSrc *src = GST_XIMAGE_SRC (object);
928 case PROP_DISPLAY_NAME:
930 g_free (src->display_name);
931 src->display_name = g_value_dup_string (value);
933 case PROP_SHOW_POINTER:
934 src->show_pointer = g_value_get_boolean (value);
936 case PROP_USE_DAMAGE:
937 src->use_damage = g_value_get_boolean (value);
940 src->startx = g_value_get_uint (value);
943 src->starty = g_value_get_uint (value);
946 src->endx = g_value_get_uint (value);
949 src->endy = g_value_get_uint (value);
952 src->remote = g_value_get_boolean (value);
955 if (src->xcontext != NULL) {
956 g_warning ("ximagesrc window ID must be set before opening display");
959 src->xid = g_value_get_uint64 (value);
962 if (src->xcontext != NULL) {
963 g_warning ("ximagesrc window name must be set before opening display");
967 src->xname = g_value_dup_string (value);
975 gst_ximage_src_get_property (GObject * object, guint prop_id,
976 GValue * value, GParamSpec * pspec)
978 GstXImageSrc *src = GST_XIMAGE_SRC (object);
981 case PROP_DISPLAY_NAME:
983 g_value_set_string (value, DisplayString (src->xcontext->disp));
985 g_value_set_string (value, src->display_name);
988 case PROP_SHOW_POINTER:
989 g_value_set_boolean (value, src->show_pointer);
991 case PROP_USE_DAMAGE:
992 g_value_set_boolean (value, src->use_damage);
995 g_value_set_uint (value, src->startx);
998 g_value_set_uint (value, src->starty);
1001 g_value_set_uint (value, src->endx);
1004 g_value_set_uint (value, src->endy);
1007 g_value_set_boolean (value, src->remote);
1010 g_value_set_uint64 (value, src->xid);
1013 g_value_set_string (value, src->xname);
1016 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1022 gst_ximage_src_clear_bufpool (GstXImageSrc * ximagesrc)
1024 g_mutex_lock (&ximagesrc->pool_lock);
1025 while (ximagesrc->buffer_pool != NULL) {
1026 GstBuffer *ximage = ximagesrc->buffer_pool->data;
1028 gst_ximage_buffer_free (ximage);
1030 ximagesrc->buffer_pool = g_slist_delete_link (ximagesrc->buffer_pool,
1031 ximagesrc->buffer_pool);
1033 g_mutex_unlock (&ximagesrc->pool_lock);
1037 gst_ximage_src_dispose (GObject * object)
1039 /* Drop references in the buffer_pool */
1040 gst_ximage_src_clear_bufpool (GST_XIMAGE_SRC (object));
1042 G_OBJECT_CLASS (parent_class)->dispose (object);
1046 gst_ximage_src_finalize (GObject * object)
1048 GstXImageSrc *src = GST_XIMAGE_SRC (object);
1051 ximageutil_xcontext_clear (src->xcontext);
1053 g_free (src->xname);
1054 g_mutex_clear (&src->pool_lock);
1055 g_mutex_clear (&src->x_lock);
1057 G_OBJECT_CLASS (parent_class)->finalize (object);
1061 gst_ximage_src_get_caps (GstBaseSrc * bs, GstCaps * filter)
1063 GstXImageSrc *s = GST_XIMAGE_SRC (bs);
1064 GstXContext *xcontext;
1066 GstVideoFormat format;
1069 if ((!s->xcontext) && (!gst_ximage_src_open_display (s, s->display_name)))
1070 return gst_pad_get_pad_template_caps (GST_BASE_SRC (s)->srcpad);
1072 if (!gst_ximage_src_recalc (s))
1073 return gst_pad_get_pad_template_caps (GST_BASE_SRC (s)->srcpad);
1075 xcontext = s->xcontext;
1076 width = s->xcontext->width;
1077 height = s->xcontext->height;
1078 if (s->xwindow != 0) {
1079 XWindowAttributes attrs;
1080 int status = XGetWindowAttributes (s->xcontext->disp, s->xwindow, &attrs);
1082 width = attrs.width;
1083 height = attrs.height;
1087 /* property comments say 0 means right/bottom, means we can't capture
1088 the top left pixel alone */
1090 s->endx = width - 1;
1092 s->endy = height - 1;
1094 if (s->endx >= s->startx && s->endy >= s->starty) {
1095 /* this means user has put in values */
1096 if (s->startx < xcontext->width && s->endx < xcontext->width &&
1097 s->starty < xcontext->height && s->endy < xcontext->height) {
1098 /* values are fine */
1099 s->width = width = s->endx - s->startx + 1;
1100 s->height = height = s->endy - s->starty + 1;
1103 ("User put in co-ordinates overshooting the X resolution, setting to full screen");
1106 s->endx = width - 1;
1107 s->endy = height - 1;
1110 GST_WARNING ("User put in bogus co-ordinates, setting to full screen");
1113 s->endx = width - 1;
1114 s->endy = height - 1;
1116 GST_DEBUG ("width = %d, height=%d", width, height);
1118 /* extrapolate alpha mask */
1119 if (xcontext->depth == 32) {
1120 alpha_mask = ~(xcontext->r_mask_output
1121 | xcontext->g_mask_output | xcontext->b_mask_output);
1127 gst_video_format_from_masks (xcontext->depth, xcontext->bpp,
1128 xcontext->endianness, xcontext->r_mask_output,
1129 xcontext->g_mask_output, xcontext->b_mask_output, alpha_mask);
1131 return gst_caps_new_simple ("video/x-raw",
1132 "format", G_TYPE_STRING, gst_video_format_to_string (format),
1133 "width", G_TYPE_INT, width,
1134 "height", G_TYPE_INT, height,
1135 "framerate", GST_TYPE_FRACTION_RANGE, 1, G_MAXINT, G_MAXINT, 1,
1136 "pixel-aspect-ratio", GST_TYPE_FRACTION, xcontext->par_n,
1137 xcontext->par_d, NULL);
1141 gst_ximage_src_set_caps (GstBaseSrc * bs, GstCaps * caps)
1143 GstXImageSrc *s = GST_XIMAGE_SRC (bs);
1144 GstStructure *structure;
1145 const GValue *new_fps;
1147 /* If not yet opened, disallow setcaps until later */
1151 /* The only thing that can change is the framerate downstream wants */
1152 structure = gst_caps_get_structure (caps, 0);
1153 new_fps = gst_structure_get_value (structure, "framerate");
1157 /* Store this FPS for use when generating buffers */
1158 s->fps_n = gst_value_get_fraction_numerator (new_fps);
1159 s->fps_d = gst_value_get_fraction_denominator (new_fps);
1161 GST_DEBUG_OBJECT (s, "peer wants %d/%d fps", s->fps_n, s->fps_d);
1167 gst_ximage_src_fixate (GstBaseSrc * bsrc, GstCaps * caps)
1170 GstStructure *structure;
1172 caps = gst_caps_make_writable (caps);
1174 for (i = 0; i < gst_caps_get_size (caps); ++i) {
1175 structure = gst_caps_get_structure (caps, i);
1177 gst_structure_fixate_field_nearest_fraction (structure, "framerate", 25, 1);
1179 caps = GST_BASE_SRC_CLASS (parent_class)->fixate (bsrc, caps);
1185 gst_ximage_src_class_init (GstXImageSrcClass * klass)
1187 GObjectClass *gc = G_OBJECT_CLASS (klass);
1188 GstElementClass *ec = GST_ELEMENT_CLASS (klass);
1189 GstBaseSrcClass *bc = GST_BASE_SRC_CLASS (klass);
1190 GstPushSrcClass *push_class = GST_PUSH_SRC_CLASS (klass);
1192 gc->set_property = gst_ximage_src_set_property;
1193 gc->get_property = gst_ximage_src_get_property;
1194 gc->dispose = gst_ximage_src_dispose;
1195 gc->finalize = gst_ximage_src_finalize;
1197 g_object_class_install_property (gc, PROP_DISPLAY_NAME,
1198 g_param_spec_string ("display-name", "Display", "X Display Name",
1199 NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
1200 g_object_class_install_property (gc, PROP_SHOW_POINTER,
1201 g_param_spec_boolean ("show-pointer", "Show Mouse Pointer",
1202 "Show mouse pointer (if XFixes extension enabled)", TRUE,
1203 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
1205 * GstXImageSrc:use-damage:
1207 * Use XDamage (if the XDamage extension is enabled)
1209 g_object_class_install_property (gc, PROP_USE_DAMAGE,
1210 g_param_spec_boolean ("use-damage", "Use XDamage",
1211 "Use XDamage (if XDamage extension enabled)", TRUE,
1212 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
1214 * GstXImageSrc:startx:
1216 * X coordinate of top left corner of area to be recorded
1217 * (0 for top left of screen)
1219 g_object_class_install_property (gc, PROP_STARTX,
1220 g_param_spec_uint ("startx", "Start X co-ordinate",
1221 "X coordinate of top left corner of area to be recorded (0 for top left of screen)",
1222 0, G_MAXINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
1224 * GstXImageSrc:starty:
1226 * Y coordinate of top left corner of area to be recorded
1227 * (0 for top left of screen)
1229 g_object_class_install_property (gc, PROP_STARTY,
1230 g_param_spec_uint ("starty", "Start Y co-ordinate",
1231 "Y coordinate of top left corner of area to be recorded (0 for top left of screen)",
1232 0, G_MAXINT, 0, G_PARAM_READWRITE));
1234 * GstXImageSrc:endx:
1236 * X coordinate of bottom right corner of area to be recorded
1237 * (0 for bottom right of screen)
1239 g_object_class_install_property (gc, PROP_ENDX,
1240 g_param_spec_uint ("endx", "End X",
1241 "X coordinate of bottom right corner of area to be recorded (0 for bottom right of screen)",
1242 0, G_MAXINT, 0, G_PARAM_READWRITE));
1244 * GstXImageSrc:endy:
1246 * Y coordinate of bottom right corner of area to be recorded
1247 * (0 for bottom right of screen)
1249 g_object_class_install_property (gc, PROP_ENDY,
1250 g_param_spec_uint ("endy", "End Y",
1251 "Y coordinate of bottom right corner of area to be recorded (0 for bottom right of screen)",
1252 0, G_MAXINT, 0, G_PARAM_READWRITE));
1255 * GstXImageSrc:remote:
1257 * Whether the X display is remote. The element will try to use alternate calls
1258 * known to work better with remote displays.
1260 g_object_class_install_property (gc, PROP_REMOTE,
1261 g_param_spec_boolean ("remote", "Remote display",
1262 "Whether the display is remote", FALSE,
1263 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
1267 * The XID of the window to capture. 0 for the root window (default).
1269 g_object_class_install_property (gc, PROP_XID,
1270 g_param_spec_uint64 ("xid", "Window XID",
1271 "Window XID to capture from", 0, G_MAXUINT64, 0,
1272 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
1274 * GstXImageSrc:xname:
1276 * The name of the window to capture, if any.
1278 g_object_class_install_property (gc, PROP_XNAME,
1279 g_param_spec_string ("xname", "Window name",
1280 "Window name to capture from", NULL,
1281 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
1283 gst_element_class_set_static_metadata (ec, "Ximage video source",
1285 "Creates a screenshot video stream",
1286 "Lutz Mueller <lutz@users.sourceforge.net>, "
1287 "Jan Schmidt <thaytan@mad.scientist.com>, "
1288 "Zaheer Merali <zaheerabbas at merali dot org>");
1289 gst_element_class_add_static_pad_template (ec, &t);
1291 bc->fixate = gst_ximage_src_fixate;
1292 bc->get_caps = gst_ximage_src_get_caps;
1293 bc->set_caps = gst_ximage_src_set_caps;
1294 bc->start = gst_ximage_src_start;
1295 bc->stop = gst_ximage_src_stop;
1296 bc->unlock = gst_ximage_src_unlock;
1297 push_class->create = gst_ximage_src_create;
1301 gst_ximage_src_init (GstXImageSrc * ximagesrc)
1303 gst_base_src_set_format (GST_BASE_SRC (ximagesrc), GST_FORMAT_TIME);
1304 gst_base_src_set_live (GST_BASE_SRC (ximagesrc), TRUE);
1306 g_mutex_init (&ximagesrc->pool_lock);
1307 g_mutex_init (&ximagesrc->x_lock);
1308 ximagesrc->show_pointer = TRUE;
1309 ximagesrc->use_damage = TRUE;
1310 ximagesrc->startx = 0;
1311 ximagesrc->starty = 0;
1312 ximagesrc->endx = 0;
1313 ximagesrc->endy = 0;
1314 ximagesrc->remote = FALSE;
1318 plugin_init (GstPlugin * plugin)
1322 GST_DEBUG_CATEGORY_INIT (gst_debug_ximage_src, "ximagesrc", 0,
1323 "ximagesrc element debug");
1325 ret = gst_element_register (plugin, "ximagesrc", GST_RANK_NONE,
1326 GST_TYPE_XIMAGE_SRC);
1331 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
1334 "X11 video input plugin using standard Xlib calls",
1335 plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);