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diff --git a/src/MixerPlugin.hxx b/src/MixerPlugin.hxx
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-/*
- * Copyright (C) 2003-2013 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.
- */
-
-/** \file
- *
- * This header declares the mixer_plugin class. It should not be
- * included directly; use MixerInternal.hxx instead in mixer
- * implementations.
- */
-
-#ifndef MPD_MIXER_PLUGIN_HXX
-#define MPD_MIXER_PLUGIN_HXX
-
-struct config_param;
-class Mixer;
-class Error;
-
-struct mixer_plugin {
- /**
- * Alocates and configures a mixer device.
- *
- * @param ao the pointer returned by audio_output_plugin.init
- * @param param the configuration section
- * @param error_r location to store the error occurring, or
- * nullptr to ignore errors
- * @return a mixer object, or nullptr on error
- */
- Mixer *(*init)(void *ao, const config_param &param,
- Error &error);
-
- /**
- * Finish and free mixer data
- */
- void (*finish)(Mixer *data);
-
- /**
- * Open mixer device
- *
- * @param error_r location to store the error occurring, or
- * nullptr to ignore errors
- * @return true on success, false on error
- */
- bool (*open)(Mixer *data, Error &error);
-
- /**
- * Close mixer device
- */
- void (*close)(Mixer *data);
-
- /**
- * Reads the current volume.
- *
- * @param error_r location to store the error occurring, or
- * nullptr to ignore errors
- * @return the current volume (0..100 including) or -1 if
- * unavailable or on error (error set, mixer will be closed)
- */
- int (*get_volume)(Mixer *mixer, Error &error);
-
- /**
- * Sets the volume.
- *
- * @param error_r location to store the error occurring, or
- * nullptr to ignore errors
- * @param volume the new volume (0..100 including)
- * @return true on success, false on error
- */
- bool (*set_volume)(Mixer *mixer, unsigned volume,
- Error &error);
-
- /**
- * If true, then the mixer is automatically opened, even if
- * its audio output is not open. If false, then the mixer is
- * disabled as long as its audio output is closed.
- */
- bool global;
-};
-
-#endif