617a4fd2d2
Remember if a mixer object is open or closed. Don't call open() again if it is already open. This guarantees that the mixer plugin is always called in a consistent state, and we will be able to remove lots of checks from the implementations. To support mixers which are automatically opened even if the audio output is still closed (to set the volume before playback starts), this patch also adds the "global" flag to the mixer_plugin struct. Both ALSA and OSS set this flag, while PULSE does not.
63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
/*
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* Copyright (C) 2003-2009 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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/** \file
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*
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* Functions which manipulate a #mixer object.
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*/
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#ifndef MPD_MIXER_CONTROL_H
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#define MPD_MIXER_CONTROL_H
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#include <stdbool.h>
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struct mixer;
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struct mixer_plugin;
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struct config_param;
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void
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mixer_disable_all(void);
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struct mixer *
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mixer_new(const struct mixer_plugin *plugin, const struct config_param *param);
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void
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mixer_free(struct mixer *mixer);
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bool
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mixer_open(struct mixer *mixer);
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void
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mixer_close(struct mixer *mixer);
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/**
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* Close the mixer unless the plugin's "global" flag is set. This is
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* called when the #audio_output is closed.
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*/
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void
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mixer_auto_close(struct mixer *mixer);
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int
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mixer_get_volume(struct mixer *mixer);
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bool
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mixer_set_volume(struct mixer *mixer, unsigned volume);
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#endif
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