83 lines
2.1 KiB
C++
83 lines
2.1 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 "NullMixerListener.hxx"
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#include "mixer/MixerControl.hxx"
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#include "mixer/MixerList.hxx"
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#include "filter/FilterRegistry.hxx"
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#include "pcm/Volume.hxx"
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#include "Main.hxx"
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#include "event/Loop.hxx"
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#include "config/Block.hxx"
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#include "util/PrintException.hxx"
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#include <assert.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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const FilterPlugin *
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filter_plugin_by_name(gcc_unused const char *name) noexcept
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{
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assert(false);
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return NULL;
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}
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int main(int argc, gcc_unused char **argv)
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try {
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int volume;
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if (argc != 2) {
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fprintf(stderr, "Usage: read_mixer PLUGIN\n");
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return EXIT_FAILURE;
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}
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EventLoop event_loop;
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NullMixerListener mixer_listener;
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Mixer *mixer = mixer_new(event_loop, alsa_mixer_plugin,
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/* ugly dangerous dummy pointer to
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make the compiler happy; this
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works with most mixers, because
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they don't need the AudioOutput */
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*(AudioOutput *)0x1,
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mixer_listener,
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ConfigBlock());
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mixer_open(mixer);
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volume = mixer_get_volume(mixer);
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mixer_close(mixer);
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mixer_free(mixer);
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assert(volume >= -1 && volume <= 100);
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if (volume < 0) {
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fprintf(stderr, "failed to read volume\n");
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return EXIT_FAILURE;
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}
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printf("%d\n", volume);
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return 0;
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} catch (...) {
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PrintException(std::current_exception());
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return EXIT_FAILURE;
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}
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