gstreamer/sys/v4l/v4l-overlay_calls.c

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/* G-Streamer generic V4L element - generic V4L overlay handling
* Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
*
* 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 <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <string.h>
#include <errno.h>
#include "v4l_calls.h"
#define DEBUG(format, args...) \
GST_DEBUG_OBJECT (\
GST_ELEMENT(v4lelement), \
"V4L-overlay: " format, ##args)
/******************************************************
* gst_v4l_set_overlay():
* calls v4l-conf
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_set_overlay (GstV4lElement * v4lelement)
{
gchar *buff;
if (v4lelement->display)
g_free (v4lelement->display);
v4lelement->display = g_strdup (g_getenv ("DISPLAY"));
DEBUG ("setting display to '%s'", v4lelement->display);
GST_V4L_CHECK_NOT_OPEN (v4lelement);
if (!v4lelement->display || v4lelement->display[0] != ':')
return FALSE;
/* start v4l-conf */
buff = g_strdup_printf ("v4l-conf -q -c %s -d %s 2> /dev/null",
v4lelement->videodev, v4lelement->display);
switch (system (buff)) {
case -1:
GST_ELEMENT_ERROR (v4lelement, RESOURCE, FAILED,
(_("Could not start v4l-conf.")), GST_ERROR_SYSTEM);
g_free (buff);
return FALSE;
case 0:
break;
default:
GST_ELEMENT_ERROR (v4lelement, RESOURCE, FAILED,
(_("Executing v4l-conf failed.")), GST_ERROR_SYSTEM);
g_free (buff);
return FALSE;
}
g_free (buff);
return TRUE;
}
/******************************************************
* gst_v4l_set_window():
* sets the window where to display the video overlay
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_set_window (GstElement * element,
gint x, gint y, gint w, gint h, struct video_clip * clips, gint num_clips)
{
GstV4lElement *v4lelement = GST_V4LELEMENT (element);
struct video_window vwin;
DEBUG ("setting video window to position (x,y/wxh) = %d,%d/%dx%d",
x, y, w, h);
GST_V4L_CHECK_OPEN (v4lelement);
GST_V4L_CHECK_OVERLAY (v4lelement);
vwin.x = x;
vwin.y = y;
vwin.width = w;
vwin.height = h;
vwin.flags = 0;
if (clips && !(v4lelement->vcap.type & VID_TYPE_CLIPPING)) {
DEBUG ("Device \'%s\' doesn't do clipping",
v4lelement->videodev ? v4lelement->videodev : "/dev/video");
vwin.clips = 0;
} else {
vwin.clips = clips;
vwin.clipcount = num_clips;
}
if (ioctl (v4lelement->video_fd, VIDIOCSWIN, &vwin) < 0) {
GST_ELEMENT_ERROR (v4lelement, RESOURCE, TOO_LAZY, (NULL),
("Failed to set the video window: %s", g_strerror (errno)));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l_enable_overlay():
* enables/disables actual video overlay display
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_enable_overlay (GstV4lElement * v4lelement, gboolean enable)
{
gint doit = enable ? 1 : 0;
DEBUG ("%s overlay", enable ? "enabling" : "disabling");
GST_V4L_CHECK_OPEN (v4lelement);
GST_V4L_CHECK_OVERLAY (v4lelement);
if (ioctl (v4lelement->video_fd, VIDIOCCAPTURE, &doit) < 0) {
GST_ELEMENT_ERROR (v4lelement, RESOURCE, TOO_LAZY, (NULL),
("Failed to %s overlay display: %s",
enable ? "enable" : "disable", g_strerror (errno)));
return FALSE;
}
return TRUE;
}