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diff --git a/src/pcm/ChannelsConverter.hxx b/src/pcm/ChannelsConverter.hxx
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+/*
+ * Copyright (C) 2003-2013 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.
+ */
+
+#ifndef MPD_PCM_CHANNELS_CONVERTER_HXX
+#define MPD_PCM_CHANNELS_CONVERTER_HXX
+
+#include "check.h"
+#include "AudioFormat.hxx"
+#include "PcmBuffer.hxx"
+
+#ifndef NDEBUG
+#include <assert.h>
+#endif
+
+class Error;
+template<typename T> struct ConstBuffer;
+
+/**
+ * A class that converts samples from one format to another.
+ */
+class PcmChannelsConverter {
+ SampleFormat format;
+ unsigned src_channels, dest_channels;
+
+ PcmBuffer buffer;
+
+public:
+#ifndef NDEBUG
+ PcmChannelsConverter()
+ :format(SampleFormat::UNDEFINED) {}
+
+ ~PcmChannelsConverter() {
+ assert(format == SampleFormat::UNDEFINED);
+ }
+#endif
+
+ /**
+ * Opens the object, prepare for Convert().
+ *
+ * @param format the sample format
+ * @param src_channels the number of source channels
+ * @param dest_channels the number of destination channels
+ * @param error location to store the error
+ * @return true on success
+ */
+ bool Open(SampleFormat format,
+ unsigned src_channels, unsigned dest_channels,
+ Error &error);
+
+ /**
+ * Closes the object. After that, you may call Open() again.
+ */
+ void Close();
+
+ /**
+ * Convert a block of PCM data.
+ *
+ * @param src the input buffer
+ * @param error location to store the error
+ * @return the destination buffer on success,
+ * ConstBuffer::Null() on error
+ */
+ gcc_pure
+ ConstBuffer<void> Convert(ConstBuffer<void> src, Error &error);
+};
+
+#endif