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/*
* Copyright 2003-2019 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "Volume.hxx"
#include "output/MultipleOutputs.hxx"
#include "Idle.hxx"
#include "util/StringCompare.hxx"
#include "util/Domain.hxx"
#include "system/PeriodClock.hxx"
#include "fs/io/BufferedOutputStream.hxx"
#include "Log.hxx"
#include <assert.h>
#include <stdlib.h>
#define SW_VOLUME_STATE "sw_volume: "
static constexpr Domain volume_domain("volume");
static unsigned volume_software_set = 100;
/** the cached hardware mixer value; invalid if negative */
static int last_hardware_volume = -1;
/** the age of #last_hardware_volume */
static PeriodClock hardware_volume_clock;
void
InvalidateHardwareVolume() noexcept
{
/* flush the hardware volume cache */
last_hardware_volume = -1;
}
int
volume_level_get(const MultipleOutputs &outputs) noexcept
{
if (last_hardware_volume >= 0 &&
!hardware_volume_clock.CheckUpdate(std::chrono::seconds(1)))
/* throttle access to hardware mixers */
return last_hardware_volume;
last_hardware_volume = outputs.GetVolume();
return last_hardware_volume;
}
static bool
software_volume_change(MultipleOutputs &outputs, unsigned volume)
{
assert(volume <= 100);
volume_software_set = volume;
outputs.SetSoftwareVolume(volume);
return true;
}
static bool
hardware_volume_change(MultipleOutputs &outputs, unsigned volume)
{
/* reset the cache */
last_hardware_volume = -1;
return outputs.SetVolume(volume);
}
bool
volume_level_change(MultipleOutputs &outputs, unsigned volume)
{
assert(volume <= 100);
volume_software_set = volume;
idle_add(IDLE_MIXER);
return hardware_volume_change(outputs, volume);
}
bool
read_sw_volume_state(const char *line, MultipleOutputs &outputs)
{
char *end = nullptr;
long int sv;
line = StringAfterPrefix(line, SW_VOLUME_STATE);
if (line == nullptr)
return false;
sv = strtol(line, &end, 10);
if (*end == 0 && sv >= 0 && sv <= 100)
software_volume_change(outputs, sv);
else
FormatWarning(volume_domain,
"Can't parse software volume: %s", line);
return true;
}
void
save_sw_volume_state(BufferedOutputStream &os)
{
os.Format(SW_VOLUME_STATE "%u\n", volume_software_set);
}
unsigned
sw_volume_state_get_hash() noexcept
{
return volume_software_set;
}
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