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/* GStreamer
*
* Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
* 2006 Edgard Lima <edgard.lima@indt.org.br>
*
* gstv4l2xoverlay.c: X-based overlay interface implementation for V4L2
*
* 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 <string.h>
#include <gst/gst.h>
#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/extensions/Xv.h>
#include <X11/extensions/Xvlib.h>
#include <sys/stat.h>
#include "gstv4l2xoverlay.h"
#include "gstv4l2object.h"
#include "v4l2_calls.h"
struct _GstV4l2Xv
{
Display *dpy;
gint port, idle_id;
GMutex *mutex;
};
GST_DEBUG_CATEGORY_STATIC (v4l2xv_debug);
#define GST_CAT_DEFAULT v4l2xv_debug
void
gst_v4l2_xoverlay_interface_init (GstXOverlayClass * klass)
{
GST_DEBUG_CATEGORY_INIT (v4l2xv_debug, "v4l2xv", 0,
"V4L2 XOverlay interface debugging");
}
static void
gst_v4l2_xoverlay_open (GstV4l2Object * v4l2object)
{
struct stat s;
GstV4l2Xv *v4l2xv;
const gchar *name = g_getenv ("DISPLAY");
unsigned int ver, rel, req, ev, err, anum;
int i, id = 0, first_id = 0, min;
XvAdaptorInfo *ai;
Display *dpy;
/* we need a display, obviously */
if (!name || !(dpy = XOpenDisplay (name))) {
GST_WARNING_OBJECT (v4l2object->element,
"No $DISPLAY set or failed to open - no overlay");
return;
}
/* First let's check that XVideo extension is available */
if (!XQueryExtension (dpy, "XVideo", &i, &i, &i)) {
GST_WARNING_OBJECT (v4l2object->element,
"Xv extension not available - no overlay");
XCloseDisplay (dpy);
return;
}
/* find port that belongs to this device */
if (XvQueryExtension (dpy, &ver, &rel, &req, &ev, &err) != Success) {
GST_WARNING_OBJECT (v4l2object->element,
"Xv extension not supported - no overlay");
XCloseDisplay (dpy);
return;
}
if (XvQueryAdaptors (dpy, DefaultRootWindow (dpy), &anum, &ai) != Success) {
GST_WARNING_OBJECT (v4l2object->element, "Failed to query Xv adaptors");
XCloseDisplay (dpy);
return;
}
if (fstat (v4l2object->video_fd, &s) < 0) {
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
(_("Cannot identify device '%s'."), v4l2object->videodev),
GST_ERROR_SYSTEM);
XCloseDisplay (dpy);
return;
}
min = s.st_rdev & 0xff;
for (i = 0; i < anum; i++) {
if (!strcmp (ai[i].name, "video4linux2")) {
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_OBJECT (v4l2object->element,
"Did not find XvPortID for device - no overlay");
XCloseDisplay (dpy);
return;
}
v4l2xv = g_new0 (GstV4l2Xv, 1);
v4l2xv->dpy = dpy;
v4l2xv->port = id;
v4l2xv->mutex = g_mutex_new ();
v4l2xv->idle_id = 0;
v4l2object->xv = v4l2xv;
if (v4l2object->xwindow_id) {
gst_v4l2_xoverlay_set_xwindow_id (v4l2object, v4l2object->xwindow_id);
}
}
static void
gst_v4l2_xoverlay_close (GstV4l2Object * v4l2object)
{
GstV4l2Xv *v4l2xv = v4l2object->xv;
if (!v4l2object->xv)
return;
if (v4l2object->xwindow_id) {
gst_v4l2_xoverlay_set_xwindow_id (v4l2object, 0);
}
XCloseDisplay (v4l2xv->dpy);
g_mutex_free (v4l2xv->mutex);
if (v4l2xv->idle_id)
g_source_remove (v4l2xv->idle_id);
g_free (v4l2xv);
v4l2object->xv = NULL;
}
void
gst_v4l2_xoverlay_start (GstV4l2Object * v4l2object)
{
if (v4l2object->xwindow_id) {
gst_v4l2_xoverlay_open (v4l2object);
}
}
void
gst_v4l2_xoverlay_stop (GstV4l2Object * v4l2object)
{
gst_v4l2_xoverlay_close (v4l2object);
}
static gboolean
idle_refresh (gpointer data)
{
GstV4l2Object *v4l2object = GST_V4L2_OBJECT (data);
GstV4l2Xv *v4l2xv = v4l2object->xv;
XWindowAttributes attr;
if (v4l2xv) {
g_mutex_lock (v4l2xv->mutex);
XGetWindowAttributes (v4l2xv->dpy, v4l2object->xwindow_id, &attr);
XvPutVideo (v4l2xv->dpy, v4l2xv->port, v4l2object->xwindow_id,
DefaultGC (v4l2xv->dpy, DefaultScreen (v4l2xv->dpy)),
0, 0, attr.width, attr.height, 0, 0, attr.width, attr.height);
v4l2xv->idle_id = 0;
g_mutex_unlock (v4l2xv->mutex);
}
/* once */
return FALSE;
}
void
gst_v4l2_xoverlay_set_xwindow_id (GstV4l2Object * v4l2object, XID xwindow_id)
{
GstV4l2Xv *v4l2xv;
XWindowAttributes attr;
gboolean change = (v4l2object->xwindow_id != xwindow_id);
GST_LOG_OBJECT (v4l2object->element, "Setting XID to %lx",
(gulong) xwindow_id);
if (!v4l2object->xv && GST_V4L2_IS_OPEN (v4l2object))
gst_v4l2_xoverlay_open (v4l2object);
v4l2xv = v4l2object->xv;
if (v4l2xv)
g_mutex_lock (v4l2xv->mutex);
if (change) {
if (v4l2object->xwindow_id && v4l2xv) {
GST_DEBUG_OBJECT (v4l2object->element,
"Deactivating old port %lx", v4l2object->xwindow_id);
XvSelectPortNotify (v4l2xv->dpy, v4l2xv->port, 0);
XvSelectVideoNotify (v4l2xv->dpy, v4l2object->xwindow_id, 0);
XvStopVideo (v4l2xv->dpy, v4l2xv->port, v4l2object->xwindow_id);
}
v4l2object->xwindow_id = xwindow_id;
}
if (!v4l2xv || xwindow_id == 0) {
if (v4l2xv)
g_mutex_unlock (v4l2xv->mutex);
return;
}
if (change) {
GST_DEBUG_OBJECT (v4l2object->element, "Activating new port %lx",
xwindow_id);
/* draw */
XvSelectPortNotify (v4l2xv->dpy, v4l2xv->port, 1);
XvSelectVideoNotify (v4l2xv->dpy, v4l2object->xwindow_id, 1);
}
XGetWindowAttributes (v4l2xv->dpy, v4l2object->xwindow_id, &attr);
XvPutVideo (v4l2xv->dpy, v4l2xv->port, v4l2object->xwindow_id,
DefaultGC (v4l2xv->dpy, DefaultScreen (v4l2xv->dpy)),
0, 0, attr.width, attr.height, 0, 0, attr.width, attr.height);
if (v4l2xv->idle_id)
g_source_remove (v4l2xv->idle_id);
v4l2xv->idle_id = g_idle_add (idle_refresh, v4l2object);
g_mutex_unlock (v4l2xv->mutex);
}
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