1 files changed, 44 insertions, 0 deletions
diff --git a/src/pcm/PcmDither.hxx b/src/pcm/PcmDither.hxx
new file mode 100644
index 000000000..106382307
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+++ b/src/pcm/PcmDither.hxx
@@ -0,0 +1,44 @@
+/*
+ * 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_DITHER_HXX
+#define MPD_PCM_DITHER_HXX
+
+#include <stdint.h>
+
+class PcmDither {
+	int32_t error[3];
+	int32_t random;
+
+public:
+	constexpr PcmDither()
+		:error{0, 0, 0}, random(0) {}
+
+	void Dither24To16(int16_t *dest, const int32_t *src,
+			  const int32_t *src_end);
+
+	void Dither32To16(int16_t *dest, const int32_t *src,
+			  const int32_t *src_end);
+
+private:
+	int16_t Dither24To16(int_fast32_t sample);
+	int16_t Dither32To16(int_fast32_t sample);
+};
+
+#endif