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bf88547489
If xoverlay is available, v4l2sink should create a window for the overlay to display in. The window automatically tries to make itself as large as possible. This works well on a small screen, but perhaps should first attempt to use the size of the video that is played (no scaling).
360 lines
9.5 KiB
C
360 lines
9.5 KiB
C
/* GStreamer
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*
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* Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
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* 2006 Edgard Lima <edgard.lima@indt.org.br>
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*
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* gstv4l2xoverlay.c: X-based overlay interface implementation for V4L2
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include <gst/gst.h>
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#include <X11/X.h>
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#include <X11/Xlib.h>
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#include <X11/extensions/Xv.h>
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#include <X11/extensions/Xvlib.h>
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#include <sys/stat.h>
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#include "gstv4l2xoverlay.h"
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#include "gstv4l2object.h"
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#include "v4l2_calls.h"
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#include "gst/gst-i18n-plugin.h"
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struct _GstV4l2Xv
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{
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Display *dpy;
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gint port, idle_id, event_id;
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GMutex *mutex;
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};
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GST_DEBUG_CATEGORY_STATIC (v4l2xv_debug);
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#define GST_CAT_DEFAULT v4l2xv_debug
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void
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gst_v4l2_xoverlay_interface_init (GstXOverlayClass * klass)
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{
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GST_DEBUG_CATEGORY_INIT (v4l2xv_debug, "v4l2xv", 0,
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"V4L2 XOverlay interface debugging");
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}
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static void
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gst_v4l2_xoverlay_open (GstV4l2Object * v4l2object)
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{
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struct stat s;
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GstV4l2Xv *v4l2xv;
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const gchar *name = g_getenv ("DISPLAY");
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unsigned int ver, rel, req, ev, err, anum;
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int i, id = 0, first_id = 0, min;
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XvAdaptorInfo *ai;
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Display *dpy;
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/* we need a display, obviously */
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if (!name || !(dpy = XOpenDisplay (name))) {
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GST_WARNING_OBJECT (v4l2object->element,
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"No $DISPLAY set or failed to open - no overlay");
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return;
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}
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/* First let's check that XVideo extension is available */
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if (!XQueryExtension (dpy, "XVideo", &i, &i, &i)) {
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GST_WARNING_OBJECT (v4l2object->element,
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"Xv extension not available - no overlay");
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XCloseDisplay (dpy);
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return;
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}
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/* find port that belongs to this device */
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if (XvQueryExtension (dpy, &ver, &rel, &req, &ev, &err) != Success) {
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GST_WARNING_OBJECT (v4l2object->element,
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"Xv extension not supported - no overlay");
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XCloseDisplay (dpy);
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return;
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}
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if (XvQueryAdaptors (dpy, DefaultRootWindow (dpy), &anum, &ai) != Success) {
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GST_WARNING_OBJECT (v4l2object->element, "Failed to query Xv adaptors");
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XCloseDisplay (dpy);
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return;
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}
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if (fstat (v4l2object->video_fd, &s) < 0) {
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GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
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(_("Cannot identify device '%s'."), v4l2object->videodev),
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GST_ERROR_SYSTEM);
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XCloseDisplay (dpy);
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return;
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}
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min = s.st_rdev & 0xff;
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for (i = 0; i < anum; i++) {
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GST_DEBUG_OBJECT (v4l2object->element, "found adapter: %s", ai[i].name);
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if (!strcmp (ai[i].name, "video4linux2") ||
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!strcmp (ai[i].name, "video4linux")) {
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if (first_id == 0)
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first_id = ai[i].base_id;
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GST_DEBUG_OBJECT (v4l2object->element,
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"first_id=%d, base_id=%lu, min=%d", first_id, ai[i].base_id, min);
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/* hmm... */
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if (first_id != 0 && ai[i].base_id == first_id + min)
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id = ai[i].base_id;
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}
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}
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XvFreeAdaptorInfo (ai);
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if (id == 0) {
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GST_WARNING_OBJECT (v4l2object->element,
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"Did not find XvPortID for device - no overlay");
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XCloseDisplay (dpy);
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return;
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}
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v4l2xv = g_new0 (GstV4l2Xv, 1);
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v4l2xv->dpy = dpy;
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v4l2xv->port = id;
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v4l2xv->mutex = g_mutex_new ();
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v4l2xv->idle_id = 0;
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v4l2xv->event_id = 0;
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v4l2object->xv = v4l2xv;
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if (v4l2object->xwindow_id) {
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gst_v4l2_xoverlay_set_window_handle (v4l2object, v4l2object->xwindow_id);
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}
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}
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static void
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gst_v4l2_xoverlay_close (GstV4l2Object * v4l2object)
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{
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GstV4l2Xv *v4l2xv = v4l2object->xv;
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if (!v4l2object->xv)
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return;
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if (v4l2object->xwindow_id) {
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gst_v4l2_xoverlay_set_window_handle (v4l2object, 0);
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}
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XCloseDisplay (v4l2xv->dpy);
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g_mutex_free (v4l2xv->mutex);
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if (v4l2xv->idle_id)
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g_source_remove (v4l2xv->idle_id);
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if (v4l2xv->event_id)
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g_source_remove (v4l2xv->event_id);
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g_free (v4l2xv);
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v4l2object->xv = NULL;
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}
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void
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gst_v4l2_xoverlay_start (GstV4l2Object * v4l2object)
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{
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if (v4l2object->xwindow_id) {
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gst_v4l2_xoverlay_open (v4l2object);
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}
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}
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void
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gst_v4l2_xoverlay_stop (GstV4l2Object * v4l2object)
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{
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gst_v4l2_xoverlay_close (v4l2object);
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}
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static void
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update_geometry (GstV4l2Object * v4l2object)
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{
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GstV4l2Xv *v4l2xv = v4l2object->xv;
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XWindowAttributes attr;
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XGetWindowAttributes (v4l2xv->dpy, v4l2object->xwindow_id, &attr);
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XvPutVideo (v4l2xv->dpy, v4l2xv->port, v4l2object->xwindow_id,
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DefaultGC (v4l2xv->dpy, DefaultScreen (v4l2xv->dpy)),
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0, 0, attr.width, attr.height, 0, 0, attr.width, attr.height);
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}
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static gboolean
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idle_refresh (gpointer data)
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{
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GstV4l2Object *v4l2object = GST_V4L2_OBJECT (data);
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GstV4l2Xv *v4l2xv = v4l2object->xv;
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GST_LOG_OBJECT (v4l2object->element, "idle refresh");
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if (v4l2xv) {
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g_mutex_lock (v4l2xv->mutex);
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update_geometry (v4l2object);
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v4l2xv->idle_id = 0;
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g_mutex_unlock (v4l2xv->mutex);
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}
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/* once */
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return FALSE;
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}
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static gboolean
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event_refresh (gpointer data)
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{
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GstV4l2Object *v4l2object = GST_V4L2_OBJECT (data);
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GstV4l2Xv *v4l2xv = v4l2object->xv;
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GST_LOG_OBJECT (v4l2object->element, "event refresh");
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if (v4l2xv) {
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XEvent e;
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g_mutex_lock (v4l2xv->mutex);
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/* Handle ConfigureNotify */
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while (XCheckWindowEvent (v4l2xv->dpy, v4l2object->xwindow_id,
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StructureNotifyMask, &e)) {
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switch (e.type) {
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case ConfigureNotify:
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update_geometry (v4l2object);
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break;
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default:
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break;
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}
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}
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g_mutex_unlock (v4l2xv->mutex);
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}
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/* repeat */
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return TRUE;
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}
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void
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gst_v4l2_xoverlay_set_window_handle (GstV4l2Object * v4l2object, guintptr id)
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{
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GstV4l2Xv *v4l2xv;
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XID xwindow_id = id;
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gboolean change = (v4l2object->xwindow_id != xwindow_id);
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GST_LOG_OBJECT (v4l2object->element, "Setting XID to %lx",
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(gulong) xwindow_id);
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if (!v4l2object->xv && GST_V4L2_IS_OPEN (v4l2object))
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gst_v4l2_xoverlay_open (v4l2object);
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v4l2xv = v4l2object->xv;
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if (v4l2xv)
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g_mutex_lock (v4l2xv->mutex);
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if (change) {
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if (v4l2object->xwindow_id && v4l2xv) {
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GST_DEBUG_OBJECT (v4l2object->element,
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"Deactivating old port %lx", v4l2object->xwindow_id);
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XvSelectPortNotify (v4l2xv->dpy, v4l2xv->port, 0);
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XvSelectVideoNotify (v4l2xv->dpy, v4l2object->xwindow_id, 0);
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XvStopVideo (v4l2xv->dpy, v4l2xv->port, v4l2object->xwindow_id);
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}
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v4l2object->xwindow_id = xwindow_id;
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}
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if (!v4l2xv || xwindow_id == 0) {
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if (v4l2xv)
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g_mutex_unlock (v4l2xv->mutex);
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return;
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}
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if (change) {
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GST_DEBUG_OBJECT (v4l2object->element, "Activating new port %lx",
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xwindow_id);
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/* draw */
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XvSelectPortNotify (v4l2xv->dpy, v4l2xv->port, 1);
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XvSelectVideoNotify (v4l2xv->dpy, v4l2object->xwindow_id, 1);
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}
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update_geometry (v4l2object);
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if (v4l2xv->idle_id)
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g_source_remove (v4l2xv->idle_id);
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v4l2xv->idle_id = g_idle_add (idle_refresh, v4l2object);
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g_mutex_unlock (v4l2xv->mutex);
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}
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/**
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* gst_v4l2_xoverlay_prepare_xwindow_id:
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* @param v4l2object
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* @param required TRUE if display is required (ie. TRUE for v4l2sink, but
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* FALSE for any other element with optional overlay capabilities)
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*/
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void
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gst_v4l2_xoverlay_prepare_xwindow_id (GstV4l2Object * v4l2object,
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gboolean required)
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{
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if (!GST_V4L2_IS_OVERLAY (v4l2object))
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return;
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gst_x_overlay_prepare_xwindow_id (GST_X_OVERLAY (v4l2object->element));
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if (required && !v4l2object->xwindow_id) {
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GstV4l2Xv *v4l2xv;
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Window win;
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int width, height;
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if (!v4l2object->xv && GST_V4L2_IS_OPEN (v4l2object))
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gst_v4l2_xoverlay_open (v4l2object);
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v4l2xv = v4l2object->xv;
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/* if xoverlay is not supported, just bail */
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if (!v4l2xv)
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return;
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/* xoverlay is supported, but we don't have a window.. so create one */
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GST_DEBUG_OBJECT (v4l2object->element, "creating window");
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g_mutex_lock (v4l2xv->mutex);
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width = XDisplayWidth (v4l2xv->dpy, DefaultScreen (v4l2xv->dpy));
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height = XDisplayHeight (v4l2xv->dpy, DefaultScreen (v4l2xv->dpy));
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GST_DEBUG_OBJECT (v4l2object->element, "dpy=%p", v4l2xv->dpy);
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win = XCreateSimpleWindow (v4l2xv->dpy,
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DefaultRootWindow (v4l2xv->dpy),
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0, 0, width, height, 0, 0,
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XBlackPixel (v4l2xv->dpy, DefaultScreen (v4l2xv->dpy)));
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GST_DEBUG_OBJECT (v4l2object->element, "win=%lu", win);
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/* @todo add mouse events for all windows, and button events for self
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* created windows, and hook up to navigation interface.. note that at
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* least some of the events we want to handle regardless of whether it
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* is a self created window or not.. such as mouse/button events in
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* order to implement navigation interface?
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*/
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XSelectInput (v4l2xv->dpy, win, ExposureMask | StructureNotifyMask);
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v4l2xv->event_id = g_timeout_add (45, event_refresh, v4l2object);
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XMapRaised (v4l2xv->dpy, win);
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XSync (v4l2xv->dpy, FALSE);
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g_mutex_unlock (v4l2xv->mutex);
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GST_DEBUG_OBJECT (v4l2object->element, "got window");
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gst_v4l2_xoverlay_set_window_handle (v4l2object, win);
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}
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}
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