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/* 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);
/* overlay */
gboolean gst_v4l2_set_display (GstV4l2Element *v4l2element);
gboolean gst_v4l2_set_window (GstElement *element,
gint x, gint y,
gint w, gint h,
struct v4l2_clip *clips,
gint num_clips);
gboolean gst_v4l2_enable_overlay (GstV4l2Element *v4l2element,
gboolean enable);
#endif /* __V4L2_CALLS_H__ */
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