71f0ed8b74
This eliminates some overhead, because the compiler doesn't need to consider these functions throwing.
125 lines
3.0 KiB
C++
125 lines
3.0 KiB
C++
/*
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* Copyright 2003-2017 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "Volume.hxx"
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#include "output/MultipleOutputs.hxx"
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#include "Idle.hxx"
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#include "util/StringCompare.hxx"
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#include "util/Domain.hxx"
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#include "system/PeriodClock.hxx"
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#include "fs/io/BufferedOutputStream.hxx"
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#include "Log.hxx"
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#include <assert.h>
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#include <stdlib.h>
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#define SW_VOLUME_STATE "sw_volume: "
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static constexpr Domain volume_domain("volume");
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static unsigned volume_software_set = 100;
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/** the cached hardware mixer value; invalid if negative */
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static int last_hardware_volume = -1;
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/** the age of #last_hardware_volume */
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static PeriodClock hardware_volume_clock;
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void
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InvalidateHardwareVolume() noexcept
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{
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/* flush the hardware volume cache */
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last_hardware_volume = -1;
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}
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int
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volume_level_get(const MultipleOutputs &outputs) noexcept
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{
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if (last_hardware_volume >= 0 &&
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!hardware_volume_clock.CheckUpdate(std::chrono::seconds(1)))
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/* throttle access to hardware mixers */
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return last_hardware_volume;
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last_hardware_volume = outputs.GetVolume();
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return last_hardware_volume;
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}
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static bool
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software_volume_change(MultipleOutputs &outputs, unsigned volume)
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{
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assert(volume <= 100);
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volume_software_set = volume;
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outputs.SetSoftwareVolume(volume);
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return true;
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}
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static bool
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hardware_volume_change(MultipleOutputs &outputs, unsigned volume)
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{
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/* reset the cache */
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last_hardware_volume = -1;
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return outputs.SetVolume(volume);
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}
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bool
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volume_level_change(MultipleOutputs &outputs, unsigned volume)
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{
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assert(volume <= 100);
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volume_software_set = volume;
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idle_add(IDLE_MIXER);
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return hardware_volume_change(outputs, volume);
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}
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bool
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read_sw_volume_state(const char *line, MultipleOutputs &outputs)
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{
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char *end = nullptr;
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long int sv;
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line = StringAfterPrefix(line, SW_VOLUME_STATE);
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if (line == nullptr)
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return false;
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sv = strtol(line, &end, 10);
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if (*end == 0 && sv >= 0 && sv <= 100)
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software_volume_change(outputs, sv);
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else
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FormatWarning(volume_domain,
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"Can't parse software volume: %s", line);
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return true;
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}
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void
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save_sw_volume_state(BufferedOutputStream &os)
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{
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os.Format(SW_VOLUME_STATE "%u\n", volume_software_set);
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}
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unsigned
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sw_volume_state_get_hash() noexcept
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{
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return volume_software_set;
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}
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