mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-24 17:20:36 +00:00
aa94247770
Original commit message from CVS: Some interface implementations for video4linux/video4linux2 plugins: * a Tuner interface, with which one can select inputs and stations. Audio work is underway here, but unfinished. * A Xoverlay interface with which one can do simple overlay. Similar to the API of the v4l/Xv XFree86 extension. Widget implementation for GTK-2.0 coming up in the sandbox. * Colorbalance - for adapting colors (brightness, contrast, etc.) - pretty basic and maybe somewhat overdesigned. But it'll do for now. Apart from these interfaces, there's also a loadable library 'xwindowlistener' that listenes to X for the movement of a window and the overlap of other windows. This is partly copied from xawtv (and thus partly GPL :(), but it's needed for the xoverlay interface implementation in the v4l/v4l2 elements. Lastly, some small changes to remove redundant properties from the v4l/v4l2 elements since these can be done much simpler. Comments appreciated!
149 lines
4.2 KiB
C
149 lines
4.2 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(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;
|
|
}
|