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/* G-Streamer generic V4L2 element - generic V4L2 overlay handling
* Copyright (C) 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 <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 "v4l2_calls.h"
#define DEBUG(format, args...) \
GST_DEBUG_OBJECT (\
GST_ELEMENT(v4l2element), \
"V4L2-overlay: " format, ##args)
/******************************************************
* gst_v4l2_set_display():
* calls v4l-conf
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_set_display (GstV4l2Element * v4l2element)
{
gchar *buff;
if (v4l2element->display)
g_free (v4l2element->display);
v4l2element->display = g_strdup (g_getenv ("DISPLAY"));
DEBUG ("trying to set overlay to '%s'", v4l2element->display);
/* start v4l-conf */
buff = g_strdup_printf ("v4l-conf -q -c %s -d %s",
v4l2element->device, v4l2element->display);
switch (system (buff)) {
case -1:
GST_ELEMENT_ERROR (v4l2element, RESOURCE, FAILED,
(_("Could not start v4l-conf.")), GST_ERROR_SYSTEM);
g_free (buff);
return FALSE;
case 0:
break;
default:
GST_ELEMENT_ERROR (v4l2element, RESOURCE, FAILED,
(_("Executing v4l-conf failed.")), GST_ERROR_SYSTEM);
g_free (buff);
return FALSE;
}
g_free (buff);
return TRUE;
}
/******************************************************
* gst_v4l2_set_window():
* sets the window where to display the video overlay
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_set_window (GstElement * element,
gint x, gint y, gint w, gint h, struct v4l2_clip * clips, gint num_clips)
{
struct v4l2_format fmt;
GstV4l2Element *v4l2element = GST_V4L2ELEMENT (element);
DEBUG ("trying to set video window to %dx%d,%d,%d", x, y, w, h);
GST_V4L2_CHECK_OVERLAY (v4l2element);
GST_V4L2_CHECK_OPEN (v4l2element);
fmt.type = V4L2_CAP_VIDEO_OVERLAY;
fmt.fmt.win.clipcount = 0;
fmt.fmt.win.w.left = x;
fmt.fmt.win.w.top = y;
fmt.fmt.win.w.width = w;
fmt.fmt.win.w.height = h;
fmt.fmt.win.clips = clips;
fmt.fmt.win.clipcount = num_clips;
fmt.fmt.win.bitmap = NULL;
if (ioctl (v4l2element->video_fd, VIDIOC_S_FMT, &fmt) < 0) {
GST_ELEMENT_ERROR (v4l2element, RESOURCE, TOO_LAZY, (NULL),
("Failed to set the video window: %s", g_strerror (errno)));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l_set_overlay():
* enables/disables actual video overlay display
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_enable_overlay (GstV4l2Element * v4l2element, gboolean enable)
{
gint doit = enable ? 1 : 0;
DEBUG ("trying to %s overlay display", enable ? "enable" : "disable");
GST_V4L2_CHECK_OPEN (v4l2element);
GST_V4L2_CHECK_OVERLAY (v4l2element);
if (ioctl (v4l2element->video_fd, VIDIOC_OVERLAY, &doit) < 0) {
GST_ELEMENT_ERROR (v4l2element, RESOURCE, TOO_LAZY, (NULL),
("Failed to %s overlay display: %s",
enable ? "enable" : "disable", g_strerror (errno)));
return FALSE;
}
return TRUE;
}
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