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-rw-r--r--src/mixer/plugins/NullMixerPlugin.cxx67
1 files changed, 67 insertions, 0 deletions
diff --git a/src/mixer/plugins/NullMixerPlugin.cxx b/src/mixer/plugins/NullMixerPlugin.cxx
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index 000000000..d846a6be1
--- /dev/null
+++ b/src/mixer/plugins/NullMixerPlugin.cxx
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2003-2015 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 "config.h"
+#include "mixer/MixerInternal.hxx"
+
+class NullMixer final : public Mixer {
+ /**
+ * The current volume in percent (0..100).
+ */
+ unsigned volume;
+
+public:
+ NullMixer(MixerListener &_listener)
+ :Mixer(null_mixer_plugin, _listener),
+ volume(100)
+ {
+ }
+
+ /* virtual methods from class Mixer */
+ bool Open(gcc_unused Error &error) override {
+ return true;
+ }
+
+ void Close() override {
+ }
+
+ int GetVolume(gcc_unused Error &error) override {
+ return volume;
+ }
+
+ bool SetVolume(unsigned _volume, gcc_unused Error &error) override {
+ volume = _volume;
+ return true;
+ }
+};
+
+static Mixer *
+null_mixer_init(gcc_unused EventLoop &event_loop,
+ gcc_unused AudioOutput &ao,
+ MixerListener &listener,
+ gcc_unused const ConfigBlock &block,
+ gcc_unused Error &error)
+{
+ return new NullMixer(listener);
+}
+
+const MixerPlugin null_mixer_plugin = {
+ null_mixer_init,
+ true,
+};