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diff --git a/src/PcmFormat.hxx b/src/PcmFormat.hxx
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+++ b/src/PcmFormat.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_FORMAT_HXX
+#define MPD_PCM_FORMAT_HXX
+
+#include "audio_format.h"
+
+#include <stdint.h>
+#include <stddef.h>
+
+struct pcm_buffer;
+class PcmDither;
+
+/**
+ * Converts PCM samples to 16 bit.  If the source format is 24 bit,
+ * then dithering is applied.
+ *
+ * @param buffer a pcm_buffer object
+ * @param dither a pcm_dither object for 24-to-16 conversion
+ * @param bits the number of in the source buffer
+ * @param src the source PCM buffer
+ * @param src_size the size of #src in bytes
+ * @param dest_size_r returns the number of bytes of the destination buffer
+ * @return the destination buffer
+ */
+const int16_t *
+pcm_convert_to_16(struct pcm_buffer *buffer, PcmDither &dither,
+		  enum sample_format src_format, const void *src,
+		  size_t src_size, size_t *dest_size_r);
+
+/**
+ * Converts PCM samples to 24 bit (32 bit alignment).
+ *
+ * @param buffer a pcm_buffer object
+ * @param bits the number of in the source buffer
+ * @param src the source PCM buffer
+ * @param src_size the size of #src in bytes
+ * @param dest_size_r returns the number of bytes of the destination buffer
+ * @return the destination buffer
+ */
+const int32_t *
+pcm_convert_to_24(struct pcm_buffer *buffer,
+		  enum sample_format src_format, const void *src,
+		  size_t src_size, size_t *dest_size_r);
+
+/**
+ * Converts PCM samples to 32 bit.
+ *
+ * @param buffer a pcm_buffer object
+ * @param bits the number of in the source buffer
+ * @param src the source PCM buffer
+ * @param src_size the size of #src in bytes
+ * @param dest_size_r returns the number of bytes of the destination buffer
+ * @return the destination buffer
+ */
+const int32_t *
+pcm_convert_to_32(struct pcm_buffer *buffer,
+		  enum sample_format src_format, const void *src,
+		  size_t src_size, size_t *dest_size_r);
+
+/**
+ * Converts PCM samples to 32 bit floating point.
+ *
+ * @param buffer a pcm_buffer object
+ * @param bits the number of in the source buffer
+ * @param src the source PCM buffer
+ * @param src_size the size of #src in bytes
+ * @param dest_size_r returns the number of bytes of the destination buffer
+ * @return the destination buffer
+ */
+const float *
+pcm_convert_to_float(struct pcm_buffer *buffer,
+		     enum sample_format src_format, const void *src,
+		     size_t src_size, size_t *dest_size_r);
+
+#endif