/* * Copyright 2003-2022 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 "NullMixerListener.hxx" #include "mixer/Control.hxx" #include "mixer/plugins/AlsaMixerPlugin.hxx" #include "filter/Registry.hxx" #include "event/Loop.hxx" #include "config/Block.hxx" #include "util/PrintException.hxx" #include #include const FilterPlugin * filter_plugin_by_name([[maybe_unused]] const char *name) noexcept { assert(false); return nullptr; } int main(int argc, [[maybe_unused]] char **argv) try { int volume; if (argc != 2) { fprintf(stderr, "Usage: read_mixer PLUGIN\n"); return EXIT_FAILURE; } EventLoop event_loop; NullMixerListener mixer_listener; Mixer *mixer = mixer_new(event_loop, alsa_mixer_plugin, /* ugly dangerous dummy pointer to make the compiler happy; this works with most mixers, because they don't need the AudioOutput */ *(AudioOutput *)0x1, mixer_listener, ConfigBlock()); mixer_open(*mixer); volume = mixer_get_volume(*mixer); mixer_close(*mixer); mixer_free(mixer); assert(volume >= -1 && volume <= 100); if (volume < 0) { fprintf(stderr, "failed to read volume\n"); return EXIT_FAILURE; } printf("%d\n", volume); return 0; } catch (...) { PrintException(std::current_exception()); return EXIT_FAILURE; }