mixer/Mixer*: drop the "Mixer" prefix from source files

src/mixer/Control.cxx

@@ -0,0 +1,132 @@
+/*
+ * Copyright 2003-2022 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 "Control.hxx"
+#include "Mixer.hxx"
+
+#include <cassert>
+
+Mixer *
+mixer_new(EventLoop &event_loop,
+	  const MixerPlugin &plugin, AudioOutput &ao,
+	  MixerListener &listener,
+	  const ConfigBlock &block)
+{
+	Mixer *mixer = plugin.init(event_loop, ao, listener, block);
+
+	assert(mixer == nullptr || mixer->IsPlugin(plugin));
+
+	return mixer;
+}
+
+void
+mixer_free(Mixer *mixer) noexcept
+{
+	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;
+}
+
+void
+mixer_open(Mixer &mixer)
+{
+	const std::scoped_lock<Mutex> protect(mixer.mutex);
+
+	if (mixer.open)
+		return;
+
+	try {
+		mixer.Open();
+		mixer.open = true;
+		mixer.failure = {};
+	} catch (...) {
+		mixer.failure = std::current_exception();
+		throw;
+	}
+}
+
+static void
+mixer_close_internal(Mixer &mixer) noexcept
+{
+	assert(mixer.open);
+
+	mixer.Close();
+	mixer.open = false;
+	mixer.failure = {};
+}
+
+void
+mixer_close(Mixer &mixer) noexcept
+{
+	const std::scoped_lock<Mutex> protect(mixer.mutex);
+
+	if (mixer.open)
+		mixer_close_internal(mixer);
+}
+
+void
+mixer_auto_close(Mixer &mixer) noexcept
+{
+	if (!mixer.IsGlobal())
+		mixer_close(mixer);
+}
+
+int
+mixer_get_volume(Mixer &mixer)
+{
+	int volume;
+
+	if (mixer.IsGlobal() && !mixer.failure)
+		mixer_open(mixer);
+
+	const std::scoped_lock<Mutex> protect(mixer.mutex);
+
+	if (mixer.open) {
+		try {
+			volume = mixer.GetVolume();
+		} catch (...) {
+			mixer_close_internal(mixer);
+			mixer.failure = std::current_exception();
+			throw;
+		}
+	} else
+		volume = -1;
+
+	return volume;
+}
+
+void
+mixer_set_volume(Mixer &mixer, unsigned volume)
+{
+	assert(volume <= 100);
+
+	if (mixer.IsGlobal() && !mixer.failure)
+		mixer_open(mixer);
+
+	const std::scoped_lock<Mutex> protect(mixer.mutex);
+
+	if (mixer.open)
+		mixer.SetVolume(volume);
+	else if (mixer.failure)
+		std::rethrow_exception(mixer.failure);
+}