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/*
* libexplain - a library of system-call-specific strerror replacements
* Copyright (C) 2011 Peter Miller
* Written by Peter Miller <pmiller@opensource.org.au>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at your
* option) any later version.
*
* This program 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libexplain/ac/errno.h>
#include <libexplain/ac/linux/videodev2.h>
#include <libexplain/ac/string.h>
#include <libexplain/ac/sys/ioctl.h>
#include <libexplain/buffer/einval.h>
#include <libexplain/buffer/enotsup.h>
#include <libexplain/buffer/is_the_null_pointer.h>
#include <libexplain/buffer/v4l2_streamparm.h>
#include <libexplain/iocontrol/generic.h>
#include <libexplain/iocontrol/vidioc_g_parm.h>
#include <libexplain/is_efault.h>
#ifdef VIDIOC_G_PARM
static void
print_data(const explain_iocontrol_t *p, explain_string_buffer_t *sb,
int errnum, int fildes, int request, const void *data)
{
(void)p;
(void)errnum;
(void)fildes;
(void)request;
explain_buffer_v4l2_streamparm(sb, data, 0);
}
static void
print_explanation(const explain_iocontrol_t *p, explain_string_buffer_t *sb,
int errnum, int fildes, int request, const void *data)
{
switch (errnum)
{
case EINVAL:
if (!data)
{
explain_buffer_is_the_null_pointer(sb, "data");
return;
}
{
const struct v4l2_streamparm *arg;
struct v4l2_format fmt;
arg = data;
if (explain_is_efault_pointer(arg, sizeof(*arg)))
goto generic;
memset(&fmt, 0, sizeof(fmt));
fmt.type = arg->type;
if (ioctl(fildes, VIDIOC_G_FMT, &fmt) >= 0)
{
/* supported buf type, still wrong */
switch (arg->type)
{
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
case V4L2_BUF_TYPE_VIDEO_OVERLAY:
case V4L2_BUF_TYPE_VBI_CAPTURE:
case V4L2_BUF_TYPE_VBI_OUTPUT:
case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
case V4L2_BUF_TYPE_PRIVATE:
#ifdef V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE
case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
#endif
#ifdef V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE
case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
#endif
explain_buffer_enotsup_device(sb, "data->type");
return;
default:
explain_buffer_einval_vague(sb, "data->type");
return;
}
}
else
{
/* not a supported buf type, still wrong */
switch (arg->type)
{
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
goto generic;
case V4L2_BUF_TYPE_VIDEO_OVERLAY:
case V4L2_BUF_TYPE_VBI_CAPTURE:
case V4L2_BUF_TYPE_VBI_OUTPUT:
case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
case V4L2_BUF_TYPE_PRIVATE:
#ifdef V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE
case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
#endif
#ifdef V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE
case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
#endif
explain_buffer_enotsup_device(sb, "data->type");
return;
default:
explain_buffer_einval_vague(sb, "data->type");
return;
}
}
}
/* No idea */
goto generic;
default:
generic:
explain_iocontrol_generic_print_explanation
(
p,
sb,
errnum,
fildes,
request,
data
);
break;
}
}
static void
print_data_returned(const explain_iocontrol_t *p, explain_string_buffer_t *sb,
int errnum, int fildes, int request, const void *data)
{
(void)p;
(void)errnum;
(void)fildes;
(void)request;
explain_buffer_v4l2_streamparm(sb, data, 1);
}
const explain_iocontrol_t explain_iocontrol_vidioc_g_parm =
{
"VIDIOC_G_PARM", /* name */
VIDIOC_G_PARM, /* value */
0, /* disambiguate */
0, /* print_name */
print_data,
print_explanation,
print_data_returned,
sizeof(struct v4l2_streamparm), /* data_size */
"struct v4l2_streamparm *", /* data_type */
0, /* flags */
__FILE__,
__LINE__,
};
#else /* ndef VIDIOC_G_PARM */
const explain_iocontrol_t explain_iocontrol_vidioc_g_parm =
{
0, /* name */
0, /* value */
0, /* disambiguate */
0, /* print_name */
0, /* print_data */
0, /* print_explanation */
0, /* print_data_returned */
0, /* data_size */
0, /* data_type */
0, /* flags */
__FILE__,
__LINE__,
};
#endif /* VIDIOC_G_PARM */
/* vim: set ts=8 sw=4 et : */
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