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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/videodev.h>
#include <libexplain/ac/string.h>
#include <libexplain/ac/sys/ioctl.h>
#include <libexplain/buffer/int.h>
#include <libexplain/buffer/int16_t.h>
#include <libexplain/buffer/video_audio.h>
#include <libexplain/buffer/video_audio_flags.h>
#include <libexplain/buffer/video_audio_mode.h>
#include <libexplain/buffer/pointer.h>
#include <libexplain/is_efault.h>
#ifdef VIDIOCGAUDIO
void
explain_buffer_video_audio(explain_string_buffer_t *sb,
const struct video_audio *data, int extra)
{
if (explain_is_efault_pointer(data, sizeof(*data)))
{
explain_buffer_pointer(sb, data);
return;
}
explain_string_buffer_puts(sb, "{ audio = ");
explain_buffer_int(sb, data->audio);
if (extra)
{
if (data->flags & VIDEO_AUDIO_VOLUME)
{
explain_string_buffer_puts(sb, ", volume = ");
explain_buffer_uint16_t(sb, data->volume);
}
if (data->flags & VIDEO_AUDIO_BASS)
{
explain_string_buffer_puts(sb, ", bass = ");
explain_buffer_uint16_t(sb, data->bass);
}
if (data->flags & VIDEO_AUDIO_TREBLE)
{
explain_string_buffer_puts(sb, ", trebble = ");
explain_buffer_uint16_t(sb, data->treble);
}
explain_string_buffer_puts(sb, ", flags = ");
explain_buffer_video_audio_flags(sb, data->flags);
explain_string_buffer_puts(sb, ", name = ");
explain_string_buffer_puts_quoted_n(sb, data->name, sizeof(data->name));
explain_string_buffer_puts(sb, ", mode = ");
explain_buffer_video_audio_mode(sb, data->mode);
if (data->flags & VIDEO_AUDIO_BALANCE)
{
explain_string_buffer_puts(sb, ", balance = ");
explain_buffer_uint16_t(sb, data->balance);
}
if (data->flags & VIDEO_AUDIO_VOLUME)
{
explain_string_buffer_puts(sb, ", step = ");
explain_buffer_uint16_t(sb, data->step);
}
}
explain_string_buffer_puts(sb, " }");
}
int
explain_video_audio_get_n(int fildes)
{
int lo = 0;
int hi = 200;
for (;;)
{
int mid = (lo + hi) / 2;
struct video_audio qry;
memset(&qry, 0, sizeof(qry));
qry.audio = mid;
if (ioctl(fildes, VIDIOCGAUDIO, &qry) >= 0)
{
if (hi <= 0 && lo <= 0)
return -1;
/* mid < naudios */
lo = mid + 1;
if (lo > hi)
return lo;
}
else if (errno != EINVAL)
{
return -1;
}
else
{
if (hi <= 0 && lo <= 0)
return -1;
/* mid >= naudios */
hi = mid - 1;
if (lo >= hi)
return lo;
}
}
}
#endif
/* vim: set ts=8 sw=4 et : */
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