1 files changed, 103 insertions, 0 deletions
diff --git a/src/filter/plugins/VolumeFilterPlugin.cxx b/src/filter/plugins/VolumeFilterPlugin.cxx
new file mode 100644
index 000000000..7b6ccc51e
--- /dev/null
+++ b/src/filter/plugins/VolumeFilterPlugin.cxx
@@ -0,0 +1,103 @@
+/*
+ * 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 "VolumeFilterPlugin.hxx"
+#include "filter/FilterPlugin.hxx"
+#include "filter/FilterInternal.hxx"
+#include "filter/FilterRegistry.hxx"
+#include "pcm/Volume.hxx"
+#include "AudioFormat.hxx"
+#include "util/ConstBuffer.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+
+#include <assert.h>
+#include <string.h>
+
+class VolumeFilter final : public Filter {
+	PcmVolume pv;
+
+public:
+	unsigned GetVolume() const {
+		return pv.GetVolume();
+	}
+
+	void SetVolume(unsigned _volume) {
+		pv.SetVolume(_volume);
+	}
+
+	virtual AudioFormat Open(AudioFormat &af, Error &error) override;
+	virtual void Close();
+	virtual ConstBuffer<void> FilterPCM(ConstBuffer<void> src,
+					    Error &error) override;
+};
+
+static constexpr Domain volume_domain("pcm_volume");
+
+static Filter *
+volume_filter_init(gcc_unused const config_param &param,
+		   gcc_unused Error &error)
+{
+	return new VolumeFilter();
+}
+
+AudioFormat
+VolumeFilter::Open(AudioFormat &audio_format, Error &error)
+{
+	if (!pv.Open(audio_format.format, error))
+		return AudioFormat::Undefined();
+
+	return audio_format;
+}
+
+void
+VolumeFilter::Close()
+{
+	pv.Close();
+}
+
+ConstBuffer<void>
+VolumeFilter::FilterPCM(ConstBuffer<void> src, gcc_unused Error &error)
+{
+	return pv.Apply(src);
+}
+
+const struct filter_plugin volume_filter_plugin = {
+	"volume",
+	volume_filter_init,
+};
+
+unsigned
+volume_filter_get(const Filter *_filter)
+{
+	const VolumeFilter *filter =
+		(const VolumeFilter *)_filter;
+
+	return filter->GetVolume();
+}
+
+void
+volume_filter_set(Filter *_filter, unsigned volume)
+{
+	VolumeFilter *filter = (VolumeFilter *)_filter;
+
+	filter->SetVolume(volume);
+}
+