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121 lines
5.8 KiB
C
121 lines
5.8 KiB
C
/* G-Streamer generic V4L2 element - generic V4L2 calls handling
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* Copyright (C) 2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __V4L2_CALLS_H__
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#define __V4L2_CALLS_H__
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#include "gstv4l2element.h"
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#include "gst/gst-i18n-plugin.h"
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/* simple check whether the device is open */
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#define GST_V4L2_IS_OPEN(element) \
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(element->video_fd > 0)
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/* check whether the device is 'active' */
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#define GST_V4L2_IS_ACTIVE(element) \
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(element->buffer != NULL)
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#define GST_V4L2_IS_OVERLAY(element) \
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(element->vcap.capabilities & V4L2_CAP_VIDEO_OVERLAY)
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/* checks whether the current v4lelement has already been open()'ed or not */
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#define GST_V4L2_CHECK_OPEN(element) \
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if (!GST_V4L2_IS_OPEN(element)) \
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{ \
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GST_ELEMENT_ERROR (element, RESOURCE, TOO_LAZY, \
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(_("Device is not open.")), (NULL)); \
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return FALSE; \
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}
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/* checks whether the current v4lelement is close()'ed or whether it is still open */
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#define GST_V4L2_CHECK_NOT_OPEN(element) \
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if (GST_V4L2_IS_OPEN(element)) \
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{ \
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GST_ELEMENT_ERROR (element, RESOURCE, TOO_LAZY, \
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(_("Device is open.")), (NULL)); \
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return FALSE; \
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}
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/* checks whether the current v4lelement does video overlay */
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#define GST_V4L2_CHECK_OVERLAY(element) \
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if (!GST_V4L2_IS_OVERLAY(element)) \
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{ \
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GST_ELEMENT_ERROR (element, RESOURCE, TOO_LAZY, \
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(NULL), ("Device cannot handle overlay")); \
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return FALSE; \
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}
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/* checks whether we're in capture mode or not */
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#define GST_V4L2_CHECK_ACTIVE(element) \
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if (!GST_V4L2_IS_ACTIVE(element)) \
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{ \
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GST_ELEMENT_ERROR (element, RESOURCE, SETTINGS, \
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(NULL), ("Device is not in streaming mode")); \
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return FALSE; \
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}
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/* checks whether we're out of capture mode or not */
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#define GST_V4L2_CHECK_NOT_ACTIVE(element) \
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if (GST_V4L2_IS_ACTIVE(element)) \
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{ \
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GST_ELEMENT_ERROR (element, RESOURCE, SETTINGS, \
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(NULL), ("Device is in streaming mode")); \
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return FALSE; \
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}
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/* open/close the device */
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gboolean gst_v4l2_open (GstV4l2Element *v4l2element);
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gboolean gst_v4l2_close (GstV4l2Element *v4l2element);
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/* norm/input/output */
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gboolean gst_v4l2_get_norm (GstV4l2Element *v4l2element,
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v4l2_std_id *norm);
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gboolean gst_v4l2_set_norm (GstV4l2Element *v4l2element,
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v4l2_std_id norm);
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gboolean gst_v4l2_get_input (GstV4l2Element *v4l2element,
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gint *input);
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gboolean gst_v4l2_set_input (GstV4l2Element *v4l2element,
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gint input);
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gboolean gst_v4l2_get_output (GstV4l2Element *v4l2element,
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gint *output);
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gboolean gst_v4l2_set_output (GstV4l2Element *v4l2element,
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gint output);
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/* frequency control */
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gboolean gst_v4l2_get_frequency (GstV4l2Element *v4l2element,
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gint tunernum,
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gulong *frequency);
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gboolean gst_v4l2_set_frequency (GstV4l2Element *v4l2element,
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gint tunernum,
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gulong frequency);
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gboolean gst_v4l2_signal_strength (GstV4l2Element *v4l2element,
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gint tunernum,
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gulong *signal);
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/* attribute control */
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gboolean gst_v4l2_get_attribute (GstV4l2Element *v4l2element,
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int attribute,
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int *value);
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gboolean gst_v4l2_set_attribute (GstV4l2Element *v4l2element,
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int attribute,
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const int value);
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#endif /* __V4L2_CALLS_H__ */
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