152 lines
2.9 KiB
C++
152 lines
2.9 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 "MixerControl.hxx"
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#include "MixerInternal.hxx"
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#include <assert.h>
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Mixer *
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mixer_new(EventLoop &event_loop,
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const MixerPlugin &plugin, AudioOutput &ao,
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MixerListener &listener,
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const ConfigBlock &block)
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{
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Mixer *mixer = plugin.init(event_loop, ao, listener, block);
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assert(mixer == nullptr || mixer->IsPlugin(plugin));
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return mixer;
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}
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void
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mixer_free(Mixer *mixer)
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{
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assert(mixer != nullptr);
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/* mixers with the "global" flag set might still be open at
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this point (see mixer_auto_close()) */
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mixer_close(mixer);
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delete mixer;
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}
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void
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mixer_open(Mixer *mixer)
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{
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assert(mixer != nullptr);
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const std::lock_guard<Mutex> protect(mixer->mutex);
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if (mixer->open)
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return;
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try {
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mixer->Open();
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mixer->open = true;
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mixer->failed = false;
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} catch (...) {
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mixer->failed = true;
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throw;
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}
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}
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static void
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mixer_close_internal(Mixer *mixer)
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{
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assert(mixer != nullptr);
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assert(mixer->open);
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mixer->Close();
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mixer->open = false;
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}
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void
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mixer_close(Mixer *mixer)
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{
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assert(mixer != nullptr);
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const std::lock_guard<Mutex> protect(mixer->mutex);
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if (mixer->open)
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mixer_close_internal(mixer);
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}
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void
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mixer_auto_close(Mixer *mixer)
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{
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if (!mixer->plugin.global)
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mixer_close(mixer);
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}
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/*
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* Close the mixer due to failure. The mutex must be locked before
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* calling this function.
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*/
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static void
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mixer_failed(Mixer *mixer)
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{
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assert(mixer->open);
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mixer_close_internal(mixer);
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mixer->failed = true;
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}
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int
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mixer_get_volume(Mixer *mixer)
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{
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int volume;
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assert(mixer != nullptr);
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if (mixer->plugin.global && !mixer->failed)
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mixer_open(mixer);
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const std::lock_guard<Mutex> protect(mixer->mutex);
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if (mixer->open) {
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try {
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volume = mixer->GetVolume();
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} catch (...) {
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mixer_failed(mixer);
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throw;
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}
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} else
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volume = -1;
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return volume;
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}
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void
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mixer_set_volume(Mixer *mixer, unsigned volume)
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{
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assert(mixer != nullptr);
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assert(volume <= 100);
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if (mixer->plugin.global && !mixer->failed)
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mixer_open(mixer);
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const std::lock_guard<Mutex> protect(mixer->mutex);
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if (mixer->open)
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mixer->SetVolume(volume);
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}
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