mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-24 17:20:36 +00:00
140 lines
4.1 KiB
C
140 lines
4.1 KiB
C
/* 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;
|
|
}
|