mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-09 10:59:39 +00:00
121 lines
5.8 KiB
C
121 lines
5.8 KiB
C
/* G-Streamer generic V4L2 element - generic V4L2 calls 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.
|
|
*/
|
|
|
|
#ifndef __V4L2_CALLS_H__
|
|
#define __V4L2_CALLS_H__
|
|
|
|
#include "gstv4l2element.h"
|
|
#include "gst/gst-i18n-plugin.h"
|
|
|
|
|
|
/* simple check whether the device is open */
|
|
#define GST_V4L2_IS_OPEN(element) \
|
|
(element->video_fd > 0)
|
|
|
|
/* check whether the device is 'active' */
|
|
#define GST_V4L2_IS_ACTIVE(element) \
|
|
(element->buffer != NULL)
|
|
|
|
#define GST_V4L2_IS_OVERLAY(element) \
|
|
(element->vcap.capabilities & V4L2_CAP_VIDEO_OVERLAY)
|
|
|
|
/* checks whether the current v4lelement has already been open()'ed or not */
|
|
#define GST_V4L2_CHECK_OPEN(element) \
|
|
if (!GST_V4L2_IS_OPEN(element)) \
|
|
{ \
|
|
GST_ELEMENT_ERROR (element, RESOURCE, TOO_LAZY, \
|
|
(_("Device is not open.")), (NULL)); \
|
|
return FALSE; \
|
|
}
|
|
|
|
/* checks whether the current v4lelement is close()'ed or whether it is still open */
|
|
#define GST_V4L2_CHECK_NOT_OPEN(element) \
|
|
if (GST_V4L2_IS_OPEN(element)) \
|
|
{ \
|
|
GST_ELEMENT_ERROR (element, RESOURCE, TOO_LAZY, \
|
|
(_("Device is open.")), (NULL)); \
|
|
return FALSE; \
|
|
}
|
|
|
|
/* checks whether the current v4lelement does video overlay */
|
|
#define GST_V4L2_CHECK_OVERLAY(element) \
|
|
if (!GST_V4L2_IS_OVERLAY(element)) \
|
|
{ \
|
|
GST_ELEMENT_ERROR (element, RESOURCE, TOO_LAZY, \
|
|
(NULL), ("Device cannot handle overlay")); \
|
|
return FALSE; \
|
|
}
|
|
|
|
/* checks whether we're in capture mode or not */
|
|
#define GST_V4L2_CHECK_ACTIVE(element) \
|
|
if (!GST_V4L2_IS_ACTIVE(element)) \
|
|
{ \
|
|
GST_ELEMENT_ERROR (element, RESOURCE, SETTINGS, \
|
|
(NULL), ("Device is not in streaming mode")); \
|
|
return FALSE; \
|
|
}
|
|
|
|
/* checks whether we're out of capture mode or not */
|
|
#define GST_V4L2_CHECK_NOT_ACTIVE(element) \
|
|
if (GST_V4L2_IS_ACTIVE(element)) \
|
|
{ \
|
|
GST_ELEMENT_ERROR (element, RESOURCE, SETTINGS, \
|
|
(NULL), ("Device is in streaming mode")); \
|
|
return FALSE; \
|
|
}
|
|
|
|
|
|
/* open/close the device */
|
|
gboolean gst_v4l2_open (GstV4l2Element *v4l2element);
|
|
gboolean gst_v4l2_close (GstV4l2Element *v4l2element);
|
|
|
|
/* norm/input/output */
|
|
gboolean gst_v4l2_get_norm (GstV4l2Element *v4l2element,
|
|
v4l2_std_id *norm);
|
|
gboolean gst_v4l2_set_norm (GstV4l2Element *v4l2element,
|
|
v4l2_std_id norm);
|
|
gboolean gst_v4l2_get_input (GstV4l2Element *v4l2element,
|
|
gint *input);
|
|
gboolean gst_v4l2_set_input (GstV4l2Element *v4l2element,
|
|
gint input);
|
|
gboolean gst_v4l2_get_output (GstV4l2Element *v4l2element,
|
|
gint *output);
|
|
gboolean gst_v4l2_set_output (GstV4l2Element *v4l2element,
|
|
gint output);
|
|
|
|
/* frequency control */
|
|
gboolean gst_v4l2_get_frequency (GstV4l2Element *v4l2element,
|
|
gint tunernum,
|
|
gulong *frequency);
|
|
gboolean gst_v4l2_set_frequency (GstV4l2Element *v4l2element,
|
|
gint tunernum,
|
|
gulong frequency);
|
|
gboolean gst_v4l2_signal_strength (GstV4l2Element *v4l2element,
|
|
gint tunernum,
|
|
gulong *signal);
|
|
|
|
/* attribute control */
|
|
gboolean gst_v4l2_get_attribute (GstV4l2Element *v4l2element,
|
|
int attribute,
|
|
int *value);
|
|
gboolean gst_v4l2_set_attribute (GstV4l2Element *v4l2element,
|
|
int attribute,
|
|
const int value);
|
|
|
|
#endif /* __V4L2_CALLS_H__ */
|