/* GStreamer * * Copyright (C) 2006 Zaheer Merali * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /** * SECTION:element-ximagesrc * * This element captures your X Display and creates raw RGB video. It uses * the XDamage extension if available to only capture areas of the screen that * have changed since the last frame. It uses the XFixes extension if * available to also capture your mouse pointer. By default it will fixate to * 25 frames per second. * * * Example pipelines * |[ * gst-launch ximagesrc ! video/x-raw-rgb,framerate=5/1 ! ffmpegcolorspace ! theoraenc ! oggmux ! filesink location=desktop.ogg * ]| Encodes your X display to an Ogg theora video at 5 frames per second. * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "gstximagesrc.h" #include #include #include #include #include #include GST_DEBUG_CATEGORY_STATIC (gst_debug_ximage_src); #define GST_CAT_DEFAULT gst_debug_ximage_src /* elementfactory information */ static const GstElementDetails ximagesrc_details = GST_ELEMENT_DETAILS ("Ximage video source", "Source/Video", "Creates a screenshot video stream", "Lutz Mueller , " "Jan Schmidt , " "Zaheer Merali "); static GstStaticPadTemplate t = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-raw-rgb, " "framerate = (fraction) [ 0, MAX ], " "width = (int) [ 1, MAX ], " "height = (int) [ 1, MAX ], " "pixel-aspect-ratio = (fraction) [ 0, MAX ]")); enum { PROP_0, PROP_DISPLAY_NAME, PROP_SCREEN_NUM, PROP_SHOW_POINTER, PROP_USE_DAMAGE, PROP_STARTX, PROP_STARTY, PROP_ENDX, PROP_ENDY }; GST_BOILERPLATE (GstXImageSrc, gst_ximage_src, GstPushSrc, GST_TYPE_PUSH_SRC); static void gst_ximage_src_fixate (GstPad * pad, GstCaps * caps); static void gst_ximage_src_clear_bufpool (GstXImageSrc * ximagesrc); /* Called when a buffer is returned from the pipeline */ static void gst_ximage_src_return_buf (GstXImageSrc * ximagesrc, GstXImageSrcBuffer * ximage) { /* If our geometry changed we can't reuse that image. */ if ((ximage->width != ximagesrc->width) || (ximage->height != ximagesrc->height)) { GST_DEBUG_OBJECT (ximagesrc, "destroy image %p as its size changed %dx%d vs current %dx%d", ximage, ximage->width, ximage->height, ximagesrc->width, ximagesrc->height); g_mutex_lock (ximagesrc->x_lock); gst_ximageutil_ximage_destroy (ximagesrc->xcontext, ximage); g_mutex_unlock (ximagesrc->x_lock); } else { /* In that case we can reuse the image and add it to our image pool. */ GST_LOG_OBJECT (ximagesrc, "recycling image %p in pool", ximage); /* need to increment the refcount again to recycle */ gst_buffer_ref (GST_BUFFER (ximage)); g_mutex_lock (ximagesrc->pool_lock); ximagesrc->buffer_pool = g_slist_prepend (ximagesrc->buffer_pool, ximage); g_mutex_unlock (ximagesrc->pool_lock); } } static gboolean gst_ximage_src_open_display (GstXImageSrc * s, const gchar * name) { g_return_val_if_fail (GST_IS_XIMAGE_SRC (s), FALSE); if (s->xcontext != NULL) return TRUE; g_mutex_lock (s->x_lock); s->xcontext = ximageutil_xcontext_get (GST_ELEMENT (s), name); if (s->xcontext == NULL) { g_mutex_unlock (s->x_lock); GST_ELEMENT_ERROR (s, RESOURCE, OPEN_READ, ("Could not open X display for reading"), ("NULL returned from getting xcontext")); return FALSE; } s->width = s->xcontext->width; s->height = s->xcontext->height; /* Always capture root window, for now */ s->xwindow = s->xcontext->root; #ifdef HAVE_XFIXES /* check if xfixes supported */ { int error_base; if (XFixesQueryExtension (s->xcontext->disp, &s->fixes_event_base, &error_base)) { s->have_xfixes = TRUE; GST_DEBUG_OBJECT (s, "X Server supports XFixes"); } else { GST_DEBUG_OBJECT (s, "X Server does not support XFixes"); } } #ifdef HAVE_XDAMAGE /* check if xdamage is supported */ { int error_base; long evmask = NoEventMask; s->have_xdamage = FALSE; s->damage = None; s->damage_copy_gc = None; s->damage_region = None; if (XDamageQueryExtension (s->xcontext->disp, &s->damage_event_base, &error_base)) { s->damage = XDamageCreate (s->xcontext->disp, s->xwindow, XDamageReportNonEmpty); if (s->damage != None) { s->damage_region = XFixesCreateRegion (s->xcontext->disp, NULL, 0); if (s->damage_region != None) { XGCValues values; GST_DEBUG_OBJECT (s, "Using XDamage extension"); values.subwindow_mode = IncludeInferiors; s->damage_copy_gc = XCreateGC (s->xcontext->disp, s->xwindow, GCSubwindowMode, &values); XSelectInput (s->xcontext->disp, s->xwindow, evmask); s->have_xdamage = TRUE; } else { XDamageDestroy (s->xcontext->disp, s->damage); s->damage = None; } } else GST_DEBUG_OBJECT (s, "Could not attach to XDamage"); } else { GST_DEBUG_OBJECT (s, "X Server does not have XDamage extension"); } } #endif #endif g_mutex_unlock (s->x_lock); if (s->xcontext == NULL) return FALSE; return TRUE; } static gboolean gst_ximage_src_start (GstBaseSrc * basesrc) { GstXImageSrc *s = GST_XIMAGE_SRC (basesrc); s->last_frame_no = -1; #ifdef HAVE_XDAMAGE if (s->last_ximage) gst_buffer_unref (GST_BUFFER_CAST (s->last_ximage)); s->last_ximage = NULL; #endif return gst_ximage_src_open_display (s, s->display_name); } static gboolean gst_ximage_src_stop (GstBaseSrc * basesrc) { GstXImageSrc *src = GST_XIMAGE_SRC (basesrc); #ifdef HAVE_XDAMAGE if (src->last_ximage) gst_buffer_unref (GST_BUFFER_CAST (src->last_ximage)); src->last_ximage = NULL; #endif gst_ximage_src_clear_bufpool (src); #ifdef HAVE_XFIXES if (src->cursor_image) XFree (src->cursor_image); src->cursor_image = NULL; #endif if (src->xcontext) { g_mutex_lock (src->x_lock); #ifdef HAVE_XDAMAGE if (src->damage_copy_gc != None) { XFreeGC (src->xcontext->disp, src->damage_copy_gc); src->damage_copy_gc = None; } if (src->damage_region != None) { XFixesDestroyRegion (src->xcontext->disp, src->damage_region); src->damage_region = None; } if (src->damage != None) { XDamageDestroy (src->xcontext->disp, src->damage); src->damage = None; } #endif ximageutil_xcontext_clear (src->xcontext); src->xcontext = NULL; g_mutex_unlock (src->x_lock); } return TRUE; } static gboolean gst_ximage_src_unlock (GstBaseSrc * basesrc) { GstXImageSrc *src = GST_XIMAGE_SRC (basesrc); /* Awaken the create() func if it's waiting on the clock */ GST_OBJECT_LOCK (src); if (src->clock_id) { GST_DEBUG_OBJECT (src, "Waking up waiting clock"); gst_clock_id_unschedule (src->clock_id); } GST_OBJECT_UNLOCK (src); return TRUE; } static gboolean gst_ximage_src_recalc (GstXImageSrc * src) { if (!src->xcontext) return FALSE; /* Maybe later we can check the display hasn't changed size */ /* We could use XQueryPointer to get only the current window. */ return TRUE; } #ifdef HAVE_XFIXES static void composite_pixel (GstXContext * xcontext, guchar * dest, guchar * src) { guint8 r = src[2]; guint8 g = src[1]; guint8 b = src[0]; guint8 a = src[3]; guint8 dr, dg, db; guint32 color; gint r_shift, r_max, r_shift_out; gint g_shift, g_max, g_shift_out; gint b_shift, b_max, b_shift_out; switch (xcontext->bpp) { case 8: color = *dest; break; case 16: color = GUINT16_FROM_LE (*(guint16 *) (dest)); break; case 32: color = GUINT32_FROM_LE (*(guint32 *) (dest)); break; default: /* Should not reach here */ g_return_if_reached (); } /* possible optimisation: * move the code that finds shift and max in the _link function */ for (r_shift = 0; !(xcontext->visual->red_mask & (1 << r_shift)); r_shift++); for (g_shift = 0; !(xcontext->visual->green_mask & (1 << g_shift)); g_shift++); for (b_shift = 0; !(xcontext->visual->blue_mask & (1 << b_shift)); b_shift++); for (r_shift_out = 0; !(xcontext->visual->red_mask & (1 << r_shift_out)); r_shift_out++); for (g_shift_out = 0; !(xcontext->visual->green_mask & (1 << g_shift_out)); g_shift_out++); for (b_shift_out = 0; !(xcontext->visual->blue_mask & (1 << b_shift_out)); b_shift_out++); r_max = (xcontext->visual->red_mask >> r_shift); b_max = (xcontext->visual->blue_mask >> b_shift); g_max = (xcontext->visual->green_mask >> g_shift); #define RGBXXX_R(x) (((x)>>r_shift) & (r_max)) #define RGBXXX_G(x) (((x)>>g_shift) & (g_max)) #define RGBXXX_B(x) (((x)>>b_shift) & (b_max)) dr = (RGBXXX_R (color) * 255) / r_max; dg = (RGBXXX_G (color) * 255) / g_max; db = (RGBXXX_B (color) * 255) / b_max; dr = (r * a + (0xff - a) * dr) / 0xff; dg = (g * a + (0xff - a) * dg) / 0xff; db = (b * a + (0xff - a) * db) / 0xff; color = (((dr * r_max) / 255) << r_shift_out) + (((dg * g_max) / 255) << g_shift_out) + (((db * b_max) / 255) << b_shift_out); switch (xcontext->bpp) { case 8: *dest = color; break; case 16: *(guint16 *) (dest) = color; break; case 32: *(guint32 *) (dest) = color; break; default: g_warning ("bpp %d not supported\n", xcontext->bpp); } } #endif /* Retrieve an XImageSrcBuffer, preferably from our * pool of existing images and populate it from the window */ static GstXImageSrcBuffer * gst_ximage_src_ximage_get (GstXImageSrc * ximagesrc) { GstXImageSrcBuffer *ximage = NULL; g_mutex_lock (ximagesrc->pool_lock); while (ximagesrc->buffer_pool != NULL) { ximage = ximagesrc->buffer_pool->data; if ((ximage->width != ximagesrc->width) || (ximage->height != ximagesrc->height)) { gst_ximage_buffer_free (ximage); } ximagesrc->buffer_pool = g_slist_delete_link (ximagesrc->buffer_pool, ximagesrc->buffer_pool); } g_mutex_unlock (ximagesrc->pool_lock); if (ximage == NULL) { GstXContext *xcontext; GstCaps *caps = NULL; GST_DEBUG_OBJECT (ximagesrc, "creating image (%dx%d)", ximagesrc->width, ximagesrc->height); g_mutex_lock (ximagesrc->x_lock); ximage = gst_ximageutil_ximage_new (ximagesrc->xcontext, GST_ELEMENT (ximagesrc), ximagesrc->width, ximagesrc->height, (BufferReturnFunc) (gst_ximage_src_return_buf)); if (ximage == NULL) { GST_ELEMENT_ERROR (ximagesrc, RESOURCE, WRITE, (NULL), ("could not create a %dx%d ximage", ximage->width, ximage->height)); g_mutex_unlock (ximagesrc->x_lock); return NULL; } xcontext = ximagesrc->xcontext; caps = gst_caps_new_simple ("video/x-raw-rgb", "bpp", G_TYPE_INT, xcontext->bpp, "depth", G_TYPE_INT, xcontext->depth, "endianness", G_TYPE_INT, xcontext->endianness, "red_mask", G_TYPE_INT, xcontext->r_mask_output, "green_mask", G_TYPE_INT, xcontext->g_mask_output, "blue_mask", G_TYPE_INT, xcontext->b_mask_output, "width", G_TYPE_INT, ximagesrc->width, "height", G_TYPE_INT, ximagesrc->height, "framerate", GST_TYPE_FRACTION, ximagesrc->fps_n, ximagesrc->fps_d, "pixel-aspect-ratio", GST_TYPE_FRACTION, gst_value_get_fraction_numerator (xcontext->par), gst_value_get_fraction_denominator (xcontext->par), NULL); gst_buffer_set_caps (GST_BUFFER (ximage), caps); g_mutex_unlock (ximagesrc->x_lock); gst_caps_unref (caps); } g_return_val_if_fail (GST_IS_XIMAGE_SRC (ximagesrc), NULL); #ifdef HAVE_XDAMAGE if (ximagesrc->have_xdamage && ximagesrc->use_damage && ximagesrc->last_ximage != NULL) { XEvent ev; /* have_frame is TRUE when either the entire screen has been * grabbed or when the last image has been copied */ gboolean have_frame = FALSE; GST_DEBUG_OBJECT (ximagesrc, "Retrieving screen using XDamage"); do { XNextEvent (ximagesrc->xcontext->disp, &ev); if (ev.type == ximagesrc->damage_event_base + XDamageNotify) { XserverRegion parts; XRectangle *rects; int nrects; parts = XFixesCreateRegion (ximagesrc->xcontext->disp, 0, 0); XDamageSubtract (ximagesrc->xcontext->disp, ximagesrc->damage, None, parts); /* Now copy out all of the damaged rectangles. */ rects = XFixesFetchRegion (ximagesrc->xcontext->disp, parts, &nrects); if (rects != NULL) { int i; if (!have_frame) { GST_LOG_OBJECT (ximagesrc, "Copying from last frame ximage->size: %d", GST_BUFFER_SIZE (GST_BUFFER (ximage))); memcpy (GST_BUFFER_DATA (GST_BUFFER (ximage)), GST_BUFFER_DATA (GST_BUFFER (ximagesrc->last_ximage)), GST_BUFFER_SIZE (GST_BUFFER (ximage))); have_frame = TRUE; } for (i = 0; i < nrects; i++) { GST_LOG_OBJECT (ximagesrc, "Damaged sub-region @ %d,%d size %dx%d reported", rects[i].x, rects[i].y, rects[i].width, rects[i].height); /* if we only want a small area, clip this damage region to * area we want */ if (ximagesrc->endx > ximagesrc->startx && ximagesrc->endy > ximagesrc->starty) { /* see if damage area intersects */ if (rects[i].x + rects[i].width < ximagesrc->startx || rects[i].x > ximagesrc->endx) { /* trivial reject */ } else if (rects[i].y + rects[i].height < ximagesrc->starty || rects[i].y > ximagesrc->endy) { /* trivial reject */ } else { /* find intersect region */ int startx, starty, width, height; startx = (rects[i].x < ximagesrc->startx) ? ximagesrc->startx : rects[i].x; starty = (rects[i].y < ximagesrc->starty) ? ximagesrc->starty : rects[i].y; width = (rects[i].x + rects[i].width < ximagesrc->endx) ? rects[i].x + rects[i].width - startx : ximagesrc->endx - startx; height = (rects[i].y + rects[i].height < ximagesrc->endy) ? rects[i].y + rects[i].height - starty : ximagesrc->endy - starty; GST_LOG_OBJECT (ximagesrc, "Retrieving damaged sub-region @ %d,%d size %dx%d as intersect region", startx, starty, width, height); XGetSubImage (ximagesrc->xcontext->disp, ximagesrc->xwindow, startx, starty, width, height, AllPlanes, ZPixmap, ximage->ximage, startx - ximagesrc->startx, starty - ximagesrc->starty); } } else { GST_LOG_OBJECT (ximagesrc, "Retrieving damaged sub-region @ %d,%d size %dx%d", rects[i].x, rects[i].y, rects[i].width, rects[i].height); XGetSubImage (ximagesrc->xcontext->disp, ximagesrc->xwindow, rects[i].x, rects[i].y, rects[i].width, rects[i].height, AllPlanes, ZPixmap, ximage->ximage, rects[i].x, rects[i].y); } } free (rects); } } } while (XPending (ximagesrc->xcontext->disp)); if (!have_frame) { GST_LOG_OBJECT (ximagesrc, "Copying from last frame ximage->size: %d", GST_BUFFER_SIZE (GST_BUFFER (ximage))); memcpy (GST_BUFFER_DATA (GST_BUFFER (ximage)), GST_BUFFER_DATA (GST_BUFFER (ximagesrc->last_ximage)), GST_BUFFER_SIZE (GST_BUFFER (ximage))); } #ifdef HAVE_XFIXES /* re-get area where last mouse pointer was but only if in our clipping * bounds */ if (ximagesrc->cursor_image) { gint x, y, width, height; x = ximagesrc->cursor_image->x - ximagesrc->cursor_image->xhot; y = ximagesrc->cursor_image->y - ximagesrc->cursor_image->yhot; width = ximagesrc->cursor_image->width; height = ximagesrc->cursor_image->height; /* bounds checking */ if (x < 0) x = 0; if (y < 0) y = 0; if (x + width > ximagesrc->xcontext->width) width = ximagesrc->xcontext->width - x; if (y + height > ximagesrc->xcontext->height) height = ximagesrc->xcontext->height - y; g_assert (x >= 0); g_assert (y >= 0); GST_DEBUG_OBJECT (ximagesrc, "Cursor was at (%d,%d) width: %d, height: %d and our range is: (%d,%d) - (%d,%d)", x, y, width, height, ximagesrc->startx, ximagesrc->starty, ximagesrc->endx, ximagesrc->endy); /* only get where cursor last was, if it is in our range */ if (ximagesrc->endx > ximagesrc->startx && ximagesrc->endy > ximagesrc->starty) { /* check bounds */ if (x + width < ximagesrc->startx || x > ximagesrc->endx) { /* trivial reject */ } else if (y + height < ximagesrc->starty || y > ximagesrc->endy) { /* trivial reject */ } else { /* find intersect region */ int startx, starty, iwidth, iheight; startx = (x < ximagesrc->startx) ? ximagesrc->startx : x; starty = (y < ximagesrc->starty) ? ximagesrc->starty : y; iwidth = (x + width < ximagesrc->endx) ? x + width - startx : ximagesrc->endx - startx; iheight = (y + height < ximagesrc->endy) ? y + height - starty : ximagesrc->endy - starty; GST_DEBUG_OBJECT (ximagesrc, "Removing cursor from %d,%d", x, y); XGetSubImage (ximagesrc->xcontext->disp, ximagesrc->xwindow, startx, starty, iwidth, iheight, AllPlanes, ZPixmap, ximage->ximage, startx - ximagesrc->startx, starty - ximagesrc->starty); } } else { GST_DEBUG_OBJECT (ximagesrc, "Removing cursor from %d,%d", x, y); XGetSubImage (ximagesrc->xcontext->disp, ximagesrc->xwindow, x, y, width, height, AllPlanes, ZPixmap, ximage->ximage, x, y); } } #endif } else { #endif #ifdef HAVE_XSHM if (ximagesrc->xcontext->use_xshm) { GST_DEBUG_OBJECT (ximagesrc, "Retrieving screen using XShm"); XShmGetImage (ximagesrc->xcontext->disp, ximagesrc->xwindow, ximage->ximage, ximagesrc->startx, ximagesrc->starty, AllPlanes); } else #endif /* HAVE_XSHM */ { GST_DEBUG_OBJECT (ximagesrc, "Retrieving screen using XGetImage"); ximage->ximage = XGetImage (ximagesrc->xcontext->disp, ximagesrc->xwindow, ximagesrc->startx, ximagesrc->starty, ximagesrc->width, ximagesrc->height, AllPlanes, ZPixmap); } #ifdef HAVE_XDAMAGE } #endif #ifdef HAVE_XFIXES if (ximagesrc->show_pointer && ximagesrc->have_xfixes) { GST_DEBUG_OBJECT (ximagesrc, "Using XFixes to draw cursor"); /* get cursor */ if (ximagesrc->cursor_image) XFree (ximagesrc->cursor_image); ximagesrc->cursor_image = XFixesGetCursorImage (ximagesrc->xcontext->disp); if (ximagesrc->cursor_image != NULL) { int cx, cy, i, j, count; int startx, starty, iwidth, iheight; gboolean cursor_in_image = TRUE; cx = ximagesrc->cursor_image->x - ximagesrc->cursor_image->xhot; if (cx < 0) cx = 0; cy = ximagesrc->cursor_image->y - ximagesrc->cursor_image->yhot; if (cy < 0) cy = 0; count = ximagesrc->cursor_image->width * ximagesrc->cursor_image->height; /* only get where cursor last was, if it is in our range */ if (ximagesrc->endx > ximagesrc->startx && ximagesrc->endy > ximagesrc->starty) { /* check bounds */ if (cx + ximagesrc->cursor_image->width < ximagesrc->startx || cx > ximagesrc->endx) { /* trivial reject */ cursor_in_image = FALSE; } else if (cy + ximagesrc->cursor_image->height < ximagesrc->starty || cy > ximagesrc->endy) { /* trivial reject */ cursor_in_image = FALSE; } else { /* find intersect region */ startx = (cx < ximagesrc->startx) ? ximagesrc->startx : cx; starty = (cy < ximagesrc->starty) ? ximagesrc->starty : cy; iwidth = (cx + ximagesrc->cursor_image->width < ximagesrc->endx) ? cx + ximagesrc->cursor_image->width - startx : ximagesrc->endx - startx; iheight = (cy + ximagesrc->cursor_image->height < ximagesrc->endy) ? cy + ximagesrc->cursor_image->height - starty : ximagesrc->endy - starty; } } else { startx = cx; starty = cy; iwidth = ximagesrc->cursor_image->width; iheight = ximagesrc->cursor_image->height; } if (cursor_in_image) { GST_DEBUG_OBJECT (ximagesrc, "Cursor is in image so trying to draw it"); for (i = 0; i < count; i++) ximagesrc->cursor_image->pixels[i] = GUINT_TO_LE (ximagesrc->cursor_image->pixels[i]); /* copy those pixels across */ for (j = starty; j < starty + iheight && j < ximagesrc->starty + ximagesrc->height; j++) { for (i = startx; i < startx + iwidth && i < ximagesrc->startx + ximagesrc->width; i++) { guint8 *src, *dest; src = (guint8 *) & (ximagesrc->cursor_image->pixels[((j - cy) * ximagesrc->cursor_image->width + (i - cx))]); dest = (guint8 *) & (ximage->ximage->data[((j - ximagesrc->starty) * ximagesrc->width + (i - ximagesrc->startx)) * (ximagesrc->xcontext->bpp / 8)]); composite_pixel (ximagesrc->xcontext, (guint8 *) dest, (guint8 *) src); } } } } } #endif #ifdef HAVE_XDAMAGE if (ximagesrc->have_xdamage && ximagesrc->use_damage) { /* need to ref ximage to put in last_ximage */ gst_buffer_ref (GST_BUFFER (ximage)); if (ximagesrc->last_ximage) { gst_buffer_unref (GST_BUFFER (ximagesrc->last_ximage)); } ximagesrc->last_ximage = ximage; GST_LOG_OBJECT (ximagesrc, "reffing current buffer for last_ximage"); } #endif return ximage; } static GstFlowReturn gst_ximage_src_create (GstPushSrc * bs, GstBuffer ** buf) { GstXImageSrc *s = GST_XIMAGE_SRC (bs); GstXImageSrcBuffer *image; GstClockTime base_time; GstClockTime next_capture_ts; GstClockTime dur; gint64 next_frame_no; if (!gst_ximage_src_recalc (s)) { GST_ELEMENT_ERROR (s, RESOURCE, FAILED, (_("Changing resolution at runtime is not yet supported.")), (NULL)); return GST_FLOW_ERROR; } if (s->fps_n <= 0 || s->fps_d <= 0) return GST_FLOW_NOT_NEGOTIATED; /* FPS must be > 0 */ /* Now, we might need to wait for the next multiple of the fps * before capturing */ GST_OBJECT_LOCK (s); if (GST_ELEMENT_CLOCK (s) == NULL) { GST_OBJECT_UNLOCK (s); GST_ELEMENT_ERROR (s, RESOURCE, FAILED, (_("Cannot operate without a clock")), (NULL)); return GST_FLOW_ERROR; } base_time = GST_ELEMENT_CAST (s)->base_time; next_capture_ts = gst_clock_get_time (GST_ELEMENT_CLOCK (s)); next_capture_ts -= base_time; /* Figure out which 'frame number' position we're at, based on the cur time * and frame rate */ next_frame_no = gst_util_uint64_scale (next_capture_ts, s->fps_n, GST_SECOND * s->fps_d); if (next_frame_no == s->last_frame_no) { GstClockID id; GstClockReturn ret; /* Need to wait for the next frame */ next_frame_no += 1; /* Figure out what the next frame time is */ next_capture_ts = gst_util_uint64_scale (next_frame_no, s->fps_d * GST_SECOND, s->fps_n); id = gst_clock_new_single_shot_id (GST_ELEMENT_CLOCK (s), next_capture_ts + base_time); s->clock_id = id; /* release the object lock while waiting */ GST_OBJECT_UNLOCK (s); GST_DEBUG_OBJECT (s, "Waiting for next frame time %" G_GUINT64_FORMAT, next_capture_ts); ret = gst_clock_id_wait (id, NULL); GST_OBJECT_LOCK (s); gst_clock_id_unref (id); s->clock_id = NULL; if (ret == GST_CLOCK_UNSCHEDULED) { /* Got woken up by the unlock function */ GST_OBJECT_UNLOCK (s); return GST_FLOW_WRONG_STATE; } /* Duration is a complete 1/fps frame duration */ dur = gst_util_uint64_scale_int (GST_SECOND, s->fps_d, s->fps_n); } else { GstClockTime next_frame_ts; GST_DEBUG_OBJECT (s, "No need to wait for next frame time %" G_GUINT64_FORMAT " next frame = %" G_GINT64_FORMAT " prev = %" G_GINT64_FORMAT, next_capture_ts, next_frame_no, s->last_frame_no); next_frame_ts = gst_util_uint64_scale (next_frame_no + 1, s->fps_d * GST_SECOND, s->fps_n); /* Frame duration is from now until the next expected capture time */ dur = next_frame_ts - next_capture_ts; } s->last_frame_no = next_frame_no; GST_OBJECT_UNLOCK (s); image = gst_ximage_src_ximage_get (s); if (!image) return GST_FLOW_ERROR; *buf = GST_BUFFER (image); GST_BUFFER_TIMESTAMP (*buf) = next_capture_ts; GST_BUFFER_DURATION (*buf) = dur; return GST_FLOW_OK; } static void gst_ximage_src_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstXImageSrc *src = GST_XIMAGE_SRC (object); switch (prop_id) { case PROP_DISPLAY_NAME: g_free (src->display_name); src->display_name = g_strdup (g_value_get_string (value)); break; case PROP_SCREEN_NUM: src->screen_num = g_value_get_uint (value); break; case PROP_SHOW_POINTER: src->show_pointer = g_value_get_boolean (value); break; case PROP_USE_DAMAGE: src->use_damage = g_value_get_boolean (value); break; case PROP_STARTX: src->startx = g_value_get_uint (value); break; case PROP_STARTY: src->starty = g_value_get_uint (value); break; case PROP_ENDX: src->endx = g_value_get_uint (value); break; case PROP_ENDY: src->endy = g_value_get_uint (value); break; default: break; } } static void gst_ximage_src_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstXImageSrc *src = GST_XIMAGE_SRC (object); switch (prop_id) { case PROP_DISPLAY_NAME: if (src->xcontext) g_value_set_string (value, DisplayString (src->xcontext->disp)); else g_value_set_string (value, src->display_name); break; case PROP_SCREEN_NUM: g_value_set_uint (value, src->screen_num); break; case PROP_SHOW_POINTER: g_value_set_boolean (value, src->show_pointer); break; case PROP_USE_DAMAGE: g_value_set_boolean (value, src->use_damage); break; case PROP_STARTX: g_value_set_uint (value, src->startx); break; case PROP_STARTY: g_value_set_uint (value, src->starty); break; case PROP_ENDX: g_value_set_uint (value, src->endx); break; case PROP_ENDY: g_value_set_uint (value, src->endy); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_ximage_src_clear_bufpool (GstXImageSrc * ximagesrc) { g_mutex_lock (ximagesrc->pool_lock); while (ximagesrc->buffer_pool != NULL) { GstXImageSrcBuffer *ximage = ximagesrc->buffer_pool->data; gst_ximage_buffer_free (ximage); ximagesrc->buffer_pool = g_slist_delete_link (ximagesrc->buffer_pool, ximagesrc->buffer_pool); } g_mutex_unlock (ximagesrc->pool_lock); } static void gst_ximage_src_base_init (gpointer g_class) { GstElementClass *ec = GST_ELEMENT_CLASS (g_class); gst_element_class_set_details (ec, &ximagesrc_details); gst_element_class_add_pad_template (ec, gst_static_pad_template_get (&t)); } static void gst_ximage_src_dispose (GObject * object) { /* Drop references in the buffer_pool */ gst_ximage_src_clear_bufpool (GST_XIMAGE_SRC (object)); G_OBJECT_CLASS (parent_class)->dispose (object); } static void gst_ximage_src_finalize (GObject * object) { GstXImageSrc *src = GST_XIMAGE_SRC (object); if (src->xcontext) ximageutil_xcontext_clear (src->xcontext); g_mutex_free (src->pool_lock); g_mutex_free (src->x_lock); G_OBJECT_CLASS (parent_class)->finalize (object); } static GstCaps * gst_ximage_src_get_caps (GstBaseSrc * bs) { GstXImageSrc *s = GST_XIMAGE_SRC (bs); GstXContext *xcontext; gint width, height; if ((!s->xcontext) && (!gst_ximage_src_open_display (s, s->display_name))) return gst_caps_copy (gst_pad_get_pad_template_caps (GST_BASE_SRC (s)->srcpad)); if (!gst_ximage_src_recalc (s)) return gst_caps_copy (gst_pad_get_pad_template_caps (GST_BASE_SRC (s)->srcpad)); xcontext = s->xcontext; width = xcontext->width; height = xcontext->height; if (s->endx > s->startx && s->endy > s->starty) { /* this means user has put in values */ if (s->startx < xcontext->width && s->endx < xcontext->width && s->starty < xcontext->height && s->endy < xcontext->height) { /* values are fine */ s->width = width = s->endx - s->startx; s->height = height = s->endy - s->starty; } else { GST_WARNING ("User put in co-ordinates overshooting the X resolution, setting to full screen"); s->startx = 0; s->starty = 0; s->endx = 0; s->endy = 0; } } else { GST_WARNING ("User put in bogus co-ordinates, setting to full screen"); s->startx = 0; s->starty = 0; s->endx = 0; s->endy = 0; } GST_DEBUG ("width = %d, height=%d", width, height); return gst_caps_new_simple ("video/x-raw-rgb", "bpp", G_TYPE_INT, xcontext->bpp, "depth", G_TYPE_INT, xcontext->depth, "endianness", G_TYPE_INT, xcontext->endianness, "red_mask", G_TYPE_INT, xcontext->r_mask_output, "green_mask", G_TYPE_INT, xcontext->g_mask_output, "blue_mask", G_TYPE_INT, xcontext->b_mask_output, "width", G_TYPE_INT, width, "height", G_TYPE_INT, height, "framerate", GST_TYPE_FRACTION_RANGE, 1, G_MAXINT, G_MAXINT, 1, "pixel-aspect-ratio", GST_TYPE_FRACTION_RANGE, 1, G_MAXINT, G_MAXINT, 1, NULL); } static gboolean gst_ximage_src_set_caps (GstBaseSrc * bs, GstCaps * caps) { GstXImageSrc *s = GST_XIMAGE_SRC (bs); GstStructure *structure; const GValue *new_fps; /* If not yet opened, disallow setcaps until later */ if (!s->xcontext) return FALSE; /* The only thing that can change is the framerate downstream wants */ structure = gst_caps_get_structure (caps, 0); new_fps = gst_structure_get_value (structure, "framerate"); if (!new_fps) return FALSE; /* Store this FPS for use when generating buffers */ s->fps_n = gst_value_get_fraction_numerator (new_fps); s->fps_d = gst_value_get_fraction_denominator (new_fps); GST_DEBUG_OBJECT (s, "peer wants %d/%d fps", s->fps_n, s->fps_d); return TRUE; } static void gst_ximage_src_fixate (GstPad * pad, GstCaps * caps) { gint i; GstStructure *structure; for (i = 0; i < gst_caps_get_size (caps); ++i) { structure = gst_caps_get_structure (caps, i); gst_structure_fixate_field_nearest_fraction (structure, "framerate", 25, 1); } } static void gst_ximage_src_class_init (GstXImageSrcClass * klass) { GObjectClass *gc = G_OBJECT_CLASS (klass); GstBaseSrcClass *bc = GST_BASE_SRC_CLASS (klass); GstPushSrcClass *push_class = GST_PUSH_SRC_CLASS (klass); gc->set_property = gst_ximage_src_set_property; gc->get_property = gst_ximage_src_get_property; gc->dispose = gst_ximage_src_dispose; gc->finalize = gst_ximage_src_finalize; g_object_class_install_property (gc, PROP_DISPLAY_NAME, g_param_spec_string ("display-name", "Display", "X Display Name", NULL, G_PARAM_READWRITE)); g_object_class_install_property (gc, PROP_SCREEN_NUM, g_param_spec_uint ("screen-num", "Screen number", "X Screen Number", 0, G_MAXINT, 0, G_PARAM_READWRITE)); g_object_class_install_property (gc, PROP_SHOW_POINTER, g_param_spec_boolean ("show-pointer", "Show Mouse Pointer", "Show mouse pointer (if XFixes extension enabled)", TRUE, G_PARAM_READWRITE)); /** * GstXImageSrc:use-damage * * Use XDamage (if the XDamage extension is enabled) * * Since: 0.10.4 **/ g_object_class_install_property (gc, PROP_USE_DAMAGE, g_param_spec_boolean ("use-damage", "Use XDamage", "Use XDamage (if XDamage extension enabled)", TRUE, G_PARAM_READWRITE)); /** * GstXImageSrc:startx * * X coordinate of top left corner of area to be recorded * (0 for top left of screen) * * Since: 0.10.4 **/ g_object_class_install_property (gc, PROP_STARTX, g_param_spec_uint ("startx", "Start X co-ordinate", "X coordinate of top left corner of area to be recorded (0 for top left of screen)", 0, G_MAXINT, 0, G_PARAM_READWRITE)); /** * GstXImageSrc:starty * * Y coordinate of top left corner of area to be recorded * (0 for top left of screen) * * Since: 0.10.4 **/ g_object_class_install_property (gc, PROP_STARTY, g_param_spec_uint ("starty", "Start Y co-ordinate", "Y coordinate of top left corner of area to be recorded (0 for top left of screen)", 0, G_MAXINT, 0, G_PARAM_READWRITE)); /** * GstXImageSrc:endx * * X coordinate of bottom right corner of area to be recorded * (0 for bottom right of screen) * * Since: 0.10.4 **/ g_object_class_install_property (gc, PROP_ENDX, g_param_spec_uint ("endx", "End X", "X coordinate of bottom right corner of area to be recorded (0 for bottom right of screen)", 0, G_MAXINT, 0, G_PARAM_READWRITE)); /** * GstXImageSrc:endy * * Y coordinate of bottom right corner of area to be recorded * (0 for bottom right of screen) * * Since: 0.10.4 **/ g_object_class_install_property (gc, PROP_ENDY, g_param_spec_uint ("endy", "End Y", "Y coordinate of bottom right corner of area to be recorded (0 for bottom right of screen)", 0, G_MAXINT, 0, G_PARAM_READWRITE)); parent_class = g_type_class_peek_parent (klass); push_class->create = gst_ximage_src_create; bc->get_caps = gst_ximage_src_get_caps; bc->set_caps = gst_ximage_src_set_caps; bc->start = gst_ximage_src_start; bc->stop = gst_ximage_src_stop; bc->unlock = gst_ximage_src_unlock; } static void gst_ximage_src_init (GstXImageSrc * ximagesrc, GstXImageSrcClass * klass) { gst_base_src_set_live (GST_BASE_SRC (ximagesrc), TRUE); gst_pad_set_fixatecaps_function (GST_BASE_SRC_PAD (ximagesrc), gst_ximage_src_fixate); ximagesrc->pool_lock = g_mutex_new (); ximagesrc->x_lock = g_mutex_new (); ximagesrc->show_pointer = TRUE; ximagesrc->use_damage = TRUE; ximagesrc->startx = 0; ximagesrc->starty = 0; ximagesrc->endx = 0; ximagesrc->endy = 0; } static gboolean plugin_init (GstPlugin * plugin) { gboolean ret; GST_DEBUG_CATEGORY_INIT (gst_debug_ximage_src, "ximagesrc", 0, "ximagesrc element debug"); ret = gst_element_register (plugin, "ximagesrc", GST_RANK_NONE, GST_TYPE_XIMAGE_SRC); return ret; } GST_PLUGIN_DEFINE (GST_VERSION_MAJOR, GST_VERSION_MINOR, "ximagesrc", "X11 video input plugin using standard Xlib calls", plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);