src/aml-v4l2-utils.h

/* GStreamer
 * Copyright (C) 2022 <xuesong.jiang@amlogic.com>
 *
 * 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 Street, Suite 500,
 * Boston, MA 02110-1335, USA.
 */

#ifndef __AML_V4L2_UTILS_H__
#define __AML_V4L2_UTILS_H__

#include <gst/gst.h>

G_BEGIN_DECLS

#define GST_AML_V4L2_ERROR_INIT \
    {                           \
        NULL, NULL              \
    }
#define GST_AML_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_AML_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_AML_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 _GstAmlV4l2Iterator GstAmlV4l2Iterator;
typedef struct _GstAmlV4l2Error GstAmlV4l2Error;

struct _GstAmlV4l2Iterator
{
    const gchar *device_path;
    const gchar *device_name;
    const gchar *sys_path;
};

struct _GstAmlV4l2Error
{
    GError *error;
    gchar *dbg_message;
    const gchar *file;
    const gchar *func;
    gint line;
};

GstAmlV4l2Iterator *gst_aml_v4l2_iterator_new(void);
gboolean gst_aml_v4l2_iterator_next(GstAmlV4l2Iterator *it);
void gst_aml_v4l2_iterator_free(GstAmlV4l2Iterator *it);

const gchar *gst_aml_v4l2_iterator_get_device_path(GstAmlV4l2Iterator *it);
const gchar *gst_aml_v4l2_iterator_get_device_name(GstAmlV4l2Iterator *it);
const gchar *gst_aml_v4l2_iterator_get_sys_path(GstAmlV4l2Iterator *it);

void gst_aml_v4l2_clear_error(GstAmlV4l2Error *error);
void gst_aml_v4l2_error(gpointer element, GstAmlV4l2Error *error);

G_END_DECLS

#endif /* __AML_V4L2_UTILS_H__ */