1 files changed, 161 insertions, 0 deletions
diff --git a/src/mixer/MixerControl.cxx b/src/mixer/MixerControl.cxx
new file mode 100644
index 000000000..bdf6fcc2b
--- /dev/null
+++ b/src/mixer/MixerControl.cxx
@@ -0,0 +1,161 @@
+/*
+ * 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(const struct mixer_plugin *plugin, void *ao,
+	  const config_param &param,
+	  Error &error)
+{
+	Mixer *mixer;
+
+	assert(plugin != nullptr);
+
+	mixer = plugin->init(ao, param, error);
+
+	assert(mixer == nullptr || mixer->IsPlugin(*plugin));
+
+	return mixer;
+}
+
+void
+mixer_free(Mixer *mixer)
+{
+	assert(mixer != nullptr);
+	assert(mixer->plugin != nullptr);
+
+	/* mixers with the "global" flag set might still be open at
+	   this point (see mixer_auto_close()) */
+	mixer_close(mixer);
+
+	mixer->plugin->finish(mixer);
+}
+
+bool
+mixer_open(Mixer *mixer, Error &error)
+{
+	bool success;
+
+	assert(mixer != nullptr);
+	assert(mixer->plugin != nullptr);
+
+	const ScopeLock protect(mixer->mutex);
+
+	if (mixer->open)
+		success = true;
+	else if (mixer->plugin->open == nullptr)
+		success = mixer->open = true;
+	else
+		success = mixer->open = mixer->plugin->open(mixer, error);
+
+	mixer->failed = !success;
+
+	return success;
+}
+
+static void
+mixer_close_internal(Mixer *mixer)
+{
+	assert(mixer != nullptr);
+	assert(mixer->plugin != nullptr);
+	assert(mixer->open);
+
+	if (mixer->plugin->close != nullptr)
+		mixer->plugin->close(mixer);
+
+	mixer->open = false;
+}
+
+void
+mixer_close(Mixer *mixer)
+{
+	assert(mixer != nullptr);
+	assert(mixer->plugin != 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->plugin->get_volume(mixer, 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->plugin->set_volume(mixer, volume, error);
+}