gstreamer/subprojects/gst-plugins-good/sys/v4l2/v4l2-utils.h

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/*
* Copyright (C) 2014 Collabora Ltd.
* Author: Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef __V4L2_UTILS_H__
#define __V4L2_UTILS_H__
#include <gst/gst.h>
G_BEGIN_DECLS
#define GST_V4L2_ERROR_INIT { NULL, NULL }
#define GST_V4L2_ERROR(v4l2err,domain,code,msg,dbg) \
{\
if (v4l2err) { \
gchar *_msg = _gst_element_error_printf msg; \
v4l2err->error = g_error_new_literal (GST_##domain##_ERROR, \
GST_##domain##_ERROR_##code, _msg); \
g_free (_msg); \
v4l2err->dbg_message = _gst_element_error_printf dbg; \
v4l2err->file = __FILE__; \
v4l2err->func = GST_FUNCTION; \
v4l2err->line = __LINE__; \
} \
}
/**
* GST_V4L2_IS_M2M:
* @_dcaps: The device capabilities
*
* Checks if the device caps represent an M2M device. Note that modern M2M
* devices uses V4L2_CAP_VIDEO_M2M* flag, but legacy uses to set both CAPTURE
* and OUTPUT flags instead.
*
* Returns: %TRUE if this is a M2M device.
*/
#define GST_V4L2_IS_M2M(_dcaps) \
(((_dcaps) & (V4L2_CAP_VIDEO_M2M | V4L2_CAP_VIDEO_M2M_MPLANE)) ||\
(((_dcaps) & \
(V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_CAPTURE_MPLANE)) && \
((_dcaps) & \
(V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_VIDEO_OUTPUT_MPLANE))))
typedef struct _GstV4l2Iterator GstV4l2Iterator;
typedef struct _GstV4l2Error GstV4l2Error;
struct _GstV4l2Iterator
{
const gchar *device_path;
const gchar *device_name;
const gchar *sys_path;
};
struct _GstV4l2Error
{
GError *error;
gchar *dbg_message;
const gchar *file;
const gchar *func;
gint line;
};
GstV4l2Iterator * gst_v4l2_iterator_new (void);
gboolean gst_v4l2_iterator_next (GstV4l2Iterator *it);
void gst_v4l2_iterator_free (GstV4l2Iterator *it);
const gchar * gst_v4l2_iterator_get_device_path (GstV4l2Iterator *it);
const gchar * gst_v4l2_iterator_get_device_name (GstV4l2Iterator *it);
const gchar * gst_v4l2_iterator_get_sys_path (GstV4l2Iterator *it);
void gst_v4l2_clear_error (GstV4l2Error *error);
void gst_v4l2_error (gpointer element, GstV4l2Error *error);
G_END_DECLS
#endif /* __V4L2_UTILS_H__ */