1 files changed, 33 insertions, 0 deletions
diff --git a/src/PcmPrng.hxx b/src/PcmPrng.hxx
new file mode 100644
index 000000000..0c823250d
--- /dev/null
+++ b/src/PcmPrng.hxx
@@ -0,0 +1,33 @@
+/*
+ * 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_PRNG_HXX
+#define MPD_PCM_PRNG_HXX
+
+/**
+ * A very simple linear congruential PRNG.  It's good enough for PCM
+ * dithering.
+ */
+static unsigned long
+pcm_prng(unsigned long state)
+{
+	return (state * 0x0019660dL + 0x3c6ef35fL) & 0xffffffffL;
+}
+
+#endif