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/* G-Streamer generic V4L element - generic V4L calls handling
* 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"
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/* simple check whether the device is open */
#define GST_V4L_IS_OPEN(v4lelement) \
(v4lelement->video_fd > 0)
/* check whether the device is 'active' */
#define GST_V4L_IS_ACTIVE(v4lelement) \
(v4lelement->buffer != NULL)
#define GST_V4L_IS_OVERLAY(v4lelement) \
(v4lelement->vcap.type & VID_TYPE_OVERLAY)
/* checks whether the current v4lelement has already been open()'ed or not */
#define GST_V4L_CHECK_OPEN(v4lelement) \
if (v4lelement->video_fd <= 0) \
{ \
gst_element_error(GST_ELEMENT(v4lelement), \
"Device is not open"); \
return FALSE; \
}
/* checks whether the current v4lelement is close()'ed or whether it is still open */
#define GST_V4L_CHECK_NOT_OPEN(v4lelement) \
if (v4lelement->video_fd != -1) \
{ \
gst_element_error(GST_ELEMENT(v4lelement), \
"Device is open"); \
return FALSE; \
}
/* checks whether the current v4lelement does video overlay */
#define GST_V4L_CHECK_OVERLAY(v4lelement) \
if (!(v4lelement->vcap.type & VID_TYPE_OVERLAY)) \
{ \
gst_element_error(GST_ELEMENT(v4lelement), \
"Device doesn't do overlay"); \
return FALSE; \
}
/* checks whether we're in capture mode or not */
#define GST_V4L_CHECK_ACTIVE(v4lelement) \
if (v4lelement->buffer == NULL) \
{ \
gst_element_error(GST_ELEMENT(v4lelement), \
"Device is not in streaming mode"); \
return FALSE; \
}
/* checks whether we're out of capture mode or not */
#define GST_V4L_CHECK_NOT_ACTIVE(v4lelement) \
if (v4lelement->buffer != NULL) \
{ \
gst_element_error(GST_ELEMENT(v4lelement), \
"Device is in streaming mode"); \
return FALSE; \
}
typedef enum {
V4L_PICTURE_HUE,
V4L_PICTURE_BRIGHTNESS,
V4L_PICTURE_CONTRAST,
V4L_PICTURE_SATURATION,
} GstV4lPictureType;
extern char *picture_name[];
typedef enum {
V4L_AUDIO_VOLUME,
V4L_AUDIO_MUTE,
V4L_AUDIO_MODE, /* stereo, mono, ... (see videodev.h) */
} GstV4lAudioType;
extern char *audio_name[];
extern char *norm_name[];
/* 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}) */
gint gst_v4l_get_num_chans (GstV4lElement *v4lelement);
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_has_tuner (GstV4lElement *v4lelement);
gboolean gst_v4l_get_signal (GstV4lElement *v4lelement, guint *signal);
gboolean gst_v4l_get_frequency (GstV4lElement *v4lelement, gulong *frequency);
gboolean gst_v4l_set_frequency (GstV4lElement *v4lelement, 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_has_audio (GstV4lElement *v4lelement);
gboolean gst_v4l_get_audio (GstV4lElement *v4lelement, GstV4lAudioType type, gint *value);
gboolean gst_v4l_set_audio (GstV4lElement *v4lelement, GstV4lAudioType type, gint value);
/* overlay */
gboolean gst_v4l_set_overlay (GstV4lElement *v4lelement, gchar *display);
gboolean gst_v4l_set_window (GstV4lElement *v4lelement, gint x, gint y,
gint w, gint h,
struct video_clip *clips, gint num_clips);
gboolean gst_v4l_enable_overlay (GstV4lElement *v4lelement, gboolean enable);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __V4L_CALLS_H__ */
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