gstreamer/sys/v4l2/v4l2-overlay_calls.c

145 lines
4.1 KiB
C
Raw Normal View History

/* 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,
const gchar *display)
{
gchar *buff;
DEBUG("trying to set overlay to '%s'", display);
/* start v4l-conf */
buff = g_strdup_printf("v4l-conf -q -c %s -d %s",
v4l2element->device?v4l2element->device:"/dev/video", display);
switch (system(buff)) {
case -1:
gst_element_error(GST_ELEMENT(v4l2element),
"Could not start v4l-conf: %s", g_strerror(errno));
g_free(buff);
return FALSE;
case 0:
break;
default:
gst_element_error(GST_ELEMENT(v4l2element),
"v4l-conf failed to run correctly: %s", g_strerror(errno));
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(GST_ELEMENT(v4l2element),
"Failed to set the video window on device %s: %s",
v4l2element->device, 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(GST_ELEMENT(v4l2element),
"Failed to %s overlay display for device %s: %s",
enable?"enable":"disable", v4l2element->device, g_strerror(errno));
return FALSE;
}
return TRUE;
}