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/* GStreamer
*
* v4l_calls.h: header for generic V4L calls
*
* Copyright (C) 2001-2002 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 __V4L_CALLS_H__
#define __V4L_CALLS_H__
#include "gstv4lelement.h"
#include "gst/gst-i18n-plugin.h"
G_BEGIN_DECLS
/* simple check whether the device is open */
#define GST_V4L_IS_OPEN(element) \
(GST_V4LELEMENT (element)->video_fd > 0)
/* check whether the device is 'active' */
#define GST_V4L_IS_ACTIVE(element) \
(GST_V4LELEMENT (element)->buffer != NULL)
#define GST_V4L_IS_OVERLAY(element) \
(GST_V4LELEMENT (element)->vcap.type & VID_TYPE_OVERLAY)
/* checks whether the current v4lelement has already been open()'ed or not */
#define GST_V4L_CHECK_OPEN(element) \
if (!GST_V4L_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_V4L_CHECK_NOT_OPEN(element) \
if (GST_V4L_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_V4L_CHECK_OVERLAY(element) \
if (!(element->vcap.type & VID_TYPE_OVERLAY)) \
{ \
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_V4L_CHECK_ACTIVE(element) \
if (!GST_V4L_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_V4L_CHECK_NOT_ACTIVE(element) \
if (GST_V4L_IS_ACTIVE (element)) \
{ \
GST_ELEMENT_ERROR (element, RESOURCE, SETTINGS, \
(NULL), ("Device is in streaming mode")); \
return FALSE; \
}
typedef enum {
V4L_PICTURE_HUE = 0,
V4L_PICTURE_BRIGHTNESS,
V4L_PICTURE_CONTRAST,
V4L_PICTURE_SATURATION,
} GstV4lPictureType;
typedef enum {
V4L_AUDIO_VOLUME = 0,
V4L_AUDIO_MUTE,
V4L_AUDIO_MODE, /* stereo, mono, ... (see videodev.h) */
} GstV4lAudioType;
/* open/close the device */
gboolean gst_v4l_open (GstV4lElement *v4lelement);
gboolean gst_v4l_close (GstV4lElement *v4lelement);
/* norm control (norm = VIDEO_MODE_{PAL|NTSC|SECAM|AUTO}) */
gboolean gst_v4l_get_chan_norm (GstV4lElement *v4lelement,
gint *channel,
gint *norm);
gboolean gst_v4l_set_chan_norm (GstV4lElement *v4lelement,
gint channel,
gint norm);
GList *gst_v4l_get_chan_names (GstV4lElement *v4lelement);
/* frequency control */
gboolean gst_v4l_get_signal (GstV4lElement *v4lelement,
gint tunernum,
guint *signal);
gboolean gst_v4l_get_frequency (GstV4lElement *v4lelement,
gint tunernum,
gulong *frequency);
gboolean gst_v4l_set_frequency (GstV4lElement *v4lelement,
gint tunernum,
gulong frequency);
/* picture control */
gboolean gst_v4l_get_picture (GstV4lElement *v4lelement,
GstV4lPictureType type,
gint *value);
gboolean gst_v4l_set_picture (GstV4lElement *v4lelement,
GstV4lPictureType type,
gint value);
/* audio control */
gboolean gst_v4l_get_audio (GstV4lElement *v4lelement,
gint audionum,
GstV4lAudioType type,
gint *value);
gboolean gst_v4l_set_audio (GstV4lElement *v4lelement,
gint audionum,
GstV4lAudioType type,
gint value);
/* functions that v4lsrc needs */
gboolean gst_v4l_set_window_properties (GstV4lElement * v4lelement);
gboolean gst_v4l_get_capabilities (GstV4lElement * v4lelement);
G_END_DECLS
#endif /* __V4L_CALLS_H__ */
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