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-rw-r--r--src/mixer/MixerControl.cxx147
1 files changed, 147 insertions, 0 deletions
diff --git a/src/mixer/MixerControl.cxx b/src/mixer/MixerControl.cxx
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+++ b/src/mixer/MixerControl.cxx
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+/*
+ * Copyright (C) 2003-2014 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 "MixerControl.hxx"
+#include "MixerInternal.hxx"
+#include "util/Error.hxx"
+
+#include <assert.h>
+
+Mixer *
+mixer_new(EventLoop &event_loop,
+ const MixerPlugin &plugin, AudioOutput &ao,
+ MixerListener &listener,
+ const config_param &param,
+ Error &error)
+{
+ Mixer *mixer = plugin.init(event_loop, ao, listener, param, error);
+
+ assert(mixer == nullptr || mixer->IsPlugin(plugin));
+
+ return mixer;
+}
+
+void
+mixer_free(Mixer *mixer)
+{
+ assert(mixer != nullptr);
+
+ /* mixers with the "global" flag set might still be open at
+ this point (see mixer_auto_close()) */
+ mixer_close(mixer);
+
+ delete mixer;
+}
+
+bool
+mixer_open(Mixer *mixer, Error &error)
+{
+ bool success;
+
+ assert(mixer != nullptr);
+
+ const ScopeLock protect(mixer->mutex);
+
+ success = mixer->open || (mixer->open = mixer->Open(error));
+
+ mixer->failed = !success;
+
+ return success;
+}
+
+static void
+mixer_close_internal(Mixer *mixer)
+{
+ assert(mixer != nullptr);
+ assert(mixer->open);
+
+ mixer->Close();
+ mixer->open = false;
+}
+
+void
+mixer_close(Mixer *mixer)
+{
+ assert(mixer != nullptr);
+
+ const ScopeLock protect(mixer->mutex);
+
+ if (mixer->open)
+ mixer_close_internal(mixer);
+}
+
+void
+mixer_auto_close(Mixer *mixer)
+{
+ if (!mixer->plugin.global)
+ mixer_close(mixer);
+}
+
+/*
+ * Close the mixer due to failure. The mutex must be locked before
+ * calling this function.
+ */
+static void
+mixer_failed(Mixer *mixer)
+{
+ assert(mixer->open);
+
+ mixer_close_internal(mixer);
+
+ mixer->failed = true;
+}
+
+int
+mixer_get_volume(Mixer *mixer, Error &error)
+{
+ int volume;
+
+ assert(mixer != nullptr);
+
+ if (mixer->plugin.global && !mixer->failed &&
+ !mixer_open(mixer, error))
+ return -1;
+
+ const ScopeLock protect(mixer->mutex);
+
+ if (mixer->open) {
+ volume = mixer->GetVolume(error);
+ if (volume < 0 && error.IsDefined())
+ mixer_failed(mixer);
+ } else
+ volume = -1;
+
+ return volume;
+}
+
+bool
+mixer_set_volume(Mixer *mixer, unsigned volume, Error &error)
+{
+ assert(mixer != nullptr);
+ assert(volume <= 100);
+
+ if (mixer->plugin.global && !mixer->failed &&
+ !mixer_open(mixer, error))
+ return false;
+
+ const ScopeLock protect(mixer->mutex);
+
+ return mixer->open && mixer->SetVolume(volume, error);
+}