/* GStreamer * * gstv4lxoverlay.c: X-based overlay interface implementation for V4L * * Copyright (C) 2003 Ronald Bultje * * 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. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include #include #include #include #include #include "gstv4lxoverlay.h" #include "gstv4lelement.h" #include "v4l_calls.h" GST_DEBUG_CATEGORY_STATIC (v4lxv_debug); #define GST_CAT_DEFAULT v4lxv_debug struct _GstV4lXv { Display *dpy; gint port, idle_id; GMutex *mutex; }; static void gst_v4l_xoverlay_set_xwindow_id (GstXOverlay * overlay, XID xwindow_id); void gst_v4l_xoverlay_interface_init (GstXOverlayClass * klass) { /* default virtual functions */ klass->set_xwindow_id = gst_v4l_xoverlay_set_xwindow_id; GST_DEBUG_CATEGORY_INIT (v4lxv_debug, "v4lxv", 0, "V4L XOverlay interface debugging"); } void gst_v4l_xoverlay_open (GstV4lElement * v4lelement) { struct stat s; GstV4lXv *v4lxv; const gchar *name = g_getenv ("DISPLAY"); int ver, rel, req, ev, err, anum, i, id = 0, first_id = 0, min; XvAdaptorInfo *ai; Display *dpy; /* we need a display, obviously */ if (!name || !(dpy = XOpenDisplay (name))) { GST_WARNING ("No $DISPLAY set or failed to open - no overlay"); return; } /* find port that belongs to this device */ if (XvQueryExtension (dpy, &ver, &rel, &req, &ev, &err) != Success) { GST_WARNING ("Xv extension not supported - no overlay"); XCloseDisplay (dpy); return; } if (XvQueryAdaptors (dpy, DefaultRootWindow (dpy), &anum, &ai) != Success) { GST_WARNING ("Failed to query Xv adaptors"); XCloseDisplay (dpy); return; } if (fstat (v4lelement->video_fd, &s) < 0) { GST_ERROR ("Failed to stat() file descriptor: %s", g_strerror (errno)); XCloseDisplay (dpy); return; } min = s.st_rdev & 0xff; for (i = 0; i < anum; i++) { if (!strcmp (ai[i].name, "video4linux")) { if (first_id == 0) first_id = ai[i].base_id; /* hmm... */ if (first_id != 0 && ai[i].base_id == first_id + min) id = ai[i].base_id; } } XvFreeAdaptorInfo (ai); if (id == 0) { GST_WARNING ("Did not find XvPortID for device - no overlay"); XCloseDisplay (dpy); return; } v4lxv = g_new0 (GstV4lXv, 1); v4lxv->dpy = dpy; v4lxv->port = id; v4lxv->mutex = g_mutex_new (); v4lxv->idle_id = 0; v4lelement->xv = v4lxv; if (v4lelement->xwindow_id) { gst_v4l_xoverlay_set_xwindow_id (GST_X_OVERLAY (v4lelement), v4lelement->xwindow_id); } } void gst_v4l_xoverlay_close (GstV4lElement * v4lelement) { GstV4lXv *v4lxv = v4lelement->xv; if (!v4lelement->xv) return; if (v4lelement->xwindow_id) { gst_v4l_xoverlay_set_xwindow_id (GST_X_OVERLAY (v4lelement), 0); } XCloseDisplay (v4lxv->dpy); g_mutex_free (v4lxv->mutex); if (v4lxv->idle_id) g_source_remove (v4lxv->idle_id); g_free (v4lxv); v4lelement->xv = NULL; } static gboolean idle_refresh (gpointer data) { GstV4lElement *v4lelement = GST_V4LELEMENT (data); GstV4lXv *v4lxv = v4lelement->xv; XWindowAttributes attr; if (v4lxv) { g_mutex_lock (v4lxv->mutex); XGetWindowAttributes (v4lxv->dpy, v4lelement->xwindow_id, &attr); XvPutVideo (v4lxv->dpy, v4lxv->port, v4lelement->xwindow_id, DefaultGC (v4lxv->dpy, DefaultScreen (v4lxv->dpy)), 0, 0, attr.width, attr.height, 0, 0, attr.width, attr.height); v4lxv->idle_id = 0; g_mutex_unlock (v4lxv->mutex); } /* once */ return FALSE; } static void gst_v4l_xoverlay_set_xwindow_id (GstXOverlay * overlay, XID xwindow_id) { GstV4lElement *v4lelement = GST_V4LELEMENT (overlay); GstV4lXv *v4lxv = v4lelement->xv; XWindowAttributes attr; gboolean change = (v4lelement->xwindow_id != xwindow_id); GST_LOG_OBJECT (v4lelement, "Changing port to %lx", xwindow_id); if (v4lxv) g_mutex_lock (v4lxv->mutex); if (change) { if (v4lelement->xwindow_id && v4lxv) { GST_DEBUG_OBJECT (v4lelement, "Disabling port %lx", v4lelement->xwindow_id); XvSelectPortNotify (v4lxv->dpy, v4lxv->port, 0); XvSelectVideoNotify (v4lxv->dpy, v4lelement->xwindow_id, 0); XvStopVideo (v4lxv->dpy, v4lxv->port, v4lelement->xwindow_id); } v4lelement->xwindow_id = xwindow_id; } if (!v4lxv || xwindow_id == 0) { if (v4lxv) g_mutex_unlock (v4lxv->mutex); return; } if (change) { GST_DEBUG_OBJECT (v4lelement, "Enabling port %lx", xwindow_id); /* draw */ XvSelectPortNotify (v4lxv->dpy, v4lxv->port, 1); XvSelectVideoNotify (v4lxv->dpy, v4lelement->xwindow_id, 1); } XGetWindowAttributes (v4lxv->dpy, v4lelement->xwindow_id, &attr); XvPutVideo (v4lxv->dpy, v4lxv->port, v4lelement->xwindow_id, DefaultGC (v4lxv->dpy, DefaultScreen (v4lxv->dpy)), 0, 0, attr.width, attr.height, 0, 0, attr.width, attr.height); if (v4lxv->idle_id) g_source_remove (v4lxv->idle_id); v4lxv->idle_id = g_idle_add (idle_refresh, v4lelement); g_mutex_unlock (v4lxv->mutex); }