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/* GStreamer
*
* Copyright (C) 2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
* 2006 Edgard Lima <edgard.lima@indt.org.br>
*
* v4l2_calls.h - generic V4L2 calls handling
*
* 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 "gstv4l2object.h"
#ifdef HAVE_LIBV4L2
# include <libv4l2.h>
#else
# include <sys/ioctl.h>
# include <linux/videodev.h>
# include <linux/videodev2.h>
# define v4l2_fd_open(fd, flags) (fd)
# define v4l2_close close
# define v4l2_dup dup
# define v4l2_ioctl ioctl
# define v4l2_read read
# define v4l2_mmap mmap
# define v4l2_munmap munmap
#endif
/* simple check whether the device is open */
#define GST_V4L2_IS_OPEN(v4l2object) \
(v4l2object->video_fd > 0)
/* check whether the device is 'active' */
#define GST_V4L2_IS_ACTIVE(v4l2object) \
(v4l2object->buffer != NULL)
#define GST_V4L2_IS_OVERLAY(v4l2object) \
(v4l2object->vcap.capabilities & V4L2_CAP_VIDEO_OVERLAY)
/* checks whether the current v4lv4l2object has already been open()'ed or not */
#define GST_V4L2_CHECK_OPEN(v4l2object) \
if (!GST_V4L2_IS_OPEN(v4l2object)) \
{ \
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, \
(_("Device is not open.")), (NULL)); \
return FALSE; \
}
/* checks whether the current v4lv4l2object is close()'ed or whether it is still open */
#define GST_V4L2_CHECK_NOT_OPEN(v4l2object) \
if (GST_V4L2_IS_OPEN(v4l2object)) \
{ \
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, \
(_("Device is open.")), (NULL)); \
return FALSE; \
}
/* checks whether the current v4lv4l2object does video overlay */
#define GST_V4L2_CHECK_OVERLAY(v4l2object) \
if (!GST_V4L2_IS_OVERLAY(v4l2object)) \
{ \
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, \
(NULL), ("Device cannot handle overlay")); \
return FALSE; \
}
/* checks whether we're in capture mode or not */
#define GST_V4L2_CHECK_ACTIVE(v4l2object) \
if (!GST_V4L2_IS_ACTIVE(v4l2object)) \
{ \
GST_ELEMENT_ERROR (v4l2object->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(v4l2object) \
if (GST_V4L2_IS_ACTIVE(v4l2object)) \
{ \
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, \
(NULL), ("Device is in streaming mode")); \
return FALSE; \
}
/* open/close the device */
gboolean gst_v4l2_open (GstV4l2Object *v4l2object);
gboolean gst_v4l2_close (GstV4l2Object *v4l2object);
/* norm/input/output */
gboolean gst_v4l2_get_norm (GstV4l2Object *v4l2object,
v4l2_std_id *norm);
gboolean gst_v4l2_set_norm (GstV4l2Object *v4l2object,
v4l2_std_id norm);
gboolean gst_v4l2_get_input (GstV4l2Object * v4l2object,
gint * input);
gboolean gst_v4l2_set_input (GstV4l2Object * v4l2object,
gint input);
#if 0 /* output not handled by now */
gboolean gst_v4l2_get_output (GstV4l2Object *v4l2object,
gint *output);
gboolean gst_v4l2_set_output (GstV4l2Object *v4l2object,
gint output);
#endif /* #if 0 - output not handled by now */
/* frequency control */
gboolean gst_v4l2_get_frequency (GstV4l2Object *v4l2object,
gint tunernum,
gulong *frequency);
gboolean gst_v4l2_set_frequency (GstV4l2Object *v4l2object,
gint tunernum,
gulong frequency);
gboolean gst_v4l2_signal_strength (GstV4l2Object *v4l2object,
gint tunernum,
gulong *signal);
/* attribute control */
gboolean gst_v4l2_get_attribute (GstV4l2Object *v4l2object,
int attribute,
int *value);
gboolean gst_v4l2_set_attribute (GstV4l2Object *v4l2object,
int attribute,
const int value);
gboolean gst_v4l2_get_capabilities (GstV4l2Object * v4l2object);
/* note: in case this is a build with TTIF logging, we can optimize slightly
* and avoid the gst_caps_to_string() in case logging isn't enabled by using
* the TTIF_TRACE_ARG_PROCESSOR feature of ttif_trace_fprintf():
*/
#ifdef GST_LOG_OVER_TTIF
# define LOG_CAPS(obj, caps) G_STMT_START { \
if (caps) { \
static TTIF_TRACE_ARG_PROCESSOR proc = { \
.convert = (char (*)(void *))gst_caps_to_string, \
.free = (void (*)(char *))g_free \
}; \
GST_DEBUG_OBJECT (obj, "%s: %qs", #caps, &proc, (caps)); \
} else { \
GST_DEBUG_OBJECT (obj, "null"); \
} \
} G_STMT_END
#else
# define LOG_CAPS(obj, caps) G_STMT_START { \
if (caps) { \
gchar *capstr = gst_caps_to_string (caps); \
GST_DEBUG_OBJECT (obj, "%s: %s", #caps, capstr); \
g_free (capstr); \
} else { \
GST_DEBUG_OBJECT (obj, "null"); \
} \
} G_STMT_END
#endif
/* note: the omapzoom kernel v4l2 display driver deviates from the v4l2 API
* spec in a few areas. For example, we must always have one buffer with
* the driver before STREAMON until after STREAMOFF. And some interfaces,
* such as rotation (and mirroring?) are different.
*
* this is only a temporary hack, as we should switch to the new driver soon
*/
#define OMAPZOOM
#endif /* __V4L2_CALLS_H__ */
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