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diff --git a/lib/rbcodec/dsp/dsp_sample_io.h b/lib/rbcodec/dsp/dsp_sample_io.h
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+++ b/lib/rbcodec/dsp/dsp_sample_io.h
@@ -0,0 +1,62 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2012 Michael Sevakis
+ *
+ * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#ifndef DSP_SAMPLE_IO_H
+#define DSP_SAMPLE_IO_H
+
+/* 16-bit samples are scaled based on these constants. The shift should be
+ * no more than 15.
+ */
+#define WORD_SHIFT      12
+#define WORD_FRACBITS   27
+#define NATIVE_DEPTH    16
+
+#define SAMPLE_BUF_COUNT 128 /* Per channel, per DSP */
+
+struct sample_io_data;
+
+/* DSP initial buffer input function call prototype */
+typedef void (*sample_input_fn_type)(struct sample_io_data *this,
+                                     struct dsp_buffer **buf_p);
+
+/* DSP final buffer output function call prototype */
+typedef void (*sample_output_fn_type)(struct sample_io_data *this,
+                                      struct dsp_buffer *src,
+                                      struct dsp_buffer *dst);
+
+/* This becomes part of the DSP aggregate */
+struct sample_io_data
+{
+    int outcount;                /* 00h: Output count */
+    struct sample_format format; /* General format info */
+    int sample_depth; /* Codec-specified sample depth */           
+    int stereo_mode;  /* Codec-specified input format */
+    sample_input_fn_type input_samples[2]; /* input functions */
+    struct dsp_buffer sample_buf; /* Buffer descriptor for converted samples */
+    int32_t sample_buf_arr[2][SAMPLE_BUF_COUNT]; /* Internal format */
+    sample_output_fn_type output_samples[2]; /* Final output functions */
+};
+
+/* Sample IO watches the format setting from the codec */
+void dsp_sample_io_configure(struct sample_io_data *this,
+                             unsigned int setting,
+                             intptr_t value);
+
+#endif /* DSP_SAMPLE_IO_H */