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/*
* libexplain - a library of system-call-specific strerror replacements
* Copyright (C) 2011, 2013 Peter Miller
*
* 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/int32_t.h>
#include <libexplain/buffer/pointer.h>
#include <libexplain/buffer/v4l2_input.h>
#include <libexplain/buffer/v4l2_input_capabilities.h>
#include <libexplain/buffer/v4l2_input_status.h>
#include <libexplain/buffer/v4l2_input_type.h>
#include <libexplain/buffer/v4l2_std_id.h>
#include <libexplain/is_efault.h>
#include <libexplain/sizeof.h>
#ifdef HAVE_LINUX_VIDEODEV2_H
void
explain_buffer_v4l2_input(explain_string_buffer_t *sb,
const struct v4l2_input *data, int extra)
{
if (explain_is_efault_pointer(data, sizeof(*data)))
{
explain_buffer_pointer(sb, data);
return;
}
explain_string_buffer_puts(sb, "{ index = ");
explain_buffer_uint32_t(sb, data->index);
if (extra)
{
explain_string_buffer_puts(sb, ", name = ");
explain_string_buffer_putsu_quoted_n(sb, data->name,
sizeof(data->name));
explain_string_buffer_puts(sb, ", type = ");
explain_buffer_v4l2_input_type(sb, data->type);
explain_string_buffer_puts(sb, ", audioset = ");
explain_buffer_uint32_t(sb, data->audioset); /* FIXME: bitfield */
explain_string_buffer_puts(sb, ", tuner = ");
explain_buffer_uint32_t(sb, data->tuner); /* name? */
explain_string_buffer_puts(sb, ", std = ");
explain_buffer_v4l2_std_id(sb, data->std);
explain_string_buffer_puts(sb, ", status = ");
explain_buffer_v4l2_input_status(sb, data->status);
#ifdef V4L2_IN_CAP_PRESETS
if (data->capabilities)
{
explain_string_buffer_puts(sb, ", capabilities = ");
explain_buffer_v4l2_input_capabilities(sb, data->capabilities);
}
#endif
if (!explain_uint32_array_all_zero(data->reserved,
SIZEOF(data->reserved)))
{
explain_string_buffer_puts(sb, ", reserved = ");
explain_buffer_uint32_array(sb, data->reserved,
SIZEOF(data->reserved));
}
}
explain_string_buffer_puts(sb, " }");
}
void
explain_buffer_v4l2_input_index(explain_string_buffer_t *sb, int value,
int fildes)
{
struct v4l2_input in;
explain_buffer_uint32_t(sb, value);
memset(&in, 0, sizeof(in));
in.index = value;
if (ioctl(fildes, VIDIOC_ENUMINPUT, &in) >= 0)
{
explain_string_buffer_putc(sb, ' ');
explain_string_buffer_putsu_quoted_n(sb, in.name, sizeof(in.name));
}
}
void
explain_buffer_v4l2_input_index_ptr(explain_string_buffer_t *sb,
const int *data, int fildes)
{
if (explain_is_efault_pointer(data, sizeof(*data)))
{
explain_buffer_pointer(sb, data);
return;
}
explain_string_buffer_puts(sb, "{ ");
explain_buffer_v4l2_input_index(sb, *data, fildes);
explain_string_buffer_puts(sb, " }");
}
int
explain_v4l2_input_get_ninputs(int fildes)
{
int lo = 0;
int hi = 200;
for (;;)
{
int mid = (lo + hi) / 2;
struct v4l2_input qry;
memset(&qry, 0, sizeof(qry));
qry.index = mid;
if (ioctl(fildes, VIDIOC_ENUMINPUT, &qry) >= 0)
{
if (hi <= 0 && lo <= 0)
return -1;
/* mid < ninputs */
lo = mid + 1;
if (lo > hi)
return lo;
}
else if (errno != EINVAL)
{
return -1;
}
else
{
if (hi <= 0 && lo <= 0)
return -1;
/* mid >= ninputs */
hi = mid - 1;
if (lo >= hi)
return lo;
}
}
}
#endif
/* vim: set ts=8 sw=4 et : */
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