gstreamer/sys/v4l2/v4l2_calls.h
Ronald S. Bultje 862d28a1b7 Some interface implementations for video4linux/video4linux2 plugins: a Tuner interface, with which one can select inp...
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!
2003-10-10 12:47:42 +00:00

130 lines
4.8 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"
/* simple check whether the device is open */
#define GST_V4L2_IS_OPEN(v4l2element) \
(v4l2element->video_fd > 0)
/* check whether the device is 'active' */
#define GST_V4L2_IS_ACTIVE(v4l2element) \
(v4l2element->buffer != NULL)
#define GST_V4L2_IS_OVERLAY(v4l2element) \
(v4l2element->vcap.capabilities & V4L2_CAP_VIDEO_OVERLAY)
/* checks whether the current v4lelement has already been open()'ed or not */
#define GST_V4L2_CHECK_OPEN(v4l2element) \
if (!GST_V4L2_IS_OPEN(v4l2element)) \
{ \
gst_element_error(GST_ELEMENT(v4l2element), \
"Device is not open"); \
return FALSE; \
}
/* checks whether the current v4lelement is close()'ed or whether it is still open */
#define GST_V4L2_CHECK_NOT_OPEN(v4l2element) \
if (GST_V4L2_IS_OPEN(v4l2element)) \
{ \
gst_element_error(GST_ELEMENT(v4l2element), \
"Device is open"); \
return FALSE; \
}
/* checks whether the current v4lelement does video overlay */
#define GST_V4L2_CHECK_OVERLAY(v4l2element) \
if (!GST_V4L2_IS_OVERLAY(v4l2element)) \
{ \
gst_element_error(GST_ELEMENT(v4l2element), \
"Device doesn't do overlay"); \
return FALSE; \
}
/* checks whether we're in capture mode or not */
#define GST_V4L2_CHECK_ACTIVE(v4l2element) \
if (!GST_V4L2_IS_ACTIVE(v4l2element)) \
{ \
gst_element_error(GST_ELEMENT(v4l2element), \
"Device is not in streaming mode"); \
return FALSE; \
}
/* checks whether we're out of capture mode or not */
#define GST_V4L2_CHECK_NOT_ACTIVE(v4l2element) \
if (GST_V4L2_IS_ACTIVE(v4l2element)) \
{ \
gst_element_error(GST_ELEMENT(v4l2element), \
"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__ */