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diff --git a/media/pocketsphinx/src/ngram_search_fwdtree.h b/media/pocketsphinx/src/ngram_search_fwdtree.h
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+/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/* ====================================================================
+ * Copyright (c) 2008 Carnegie Mellon University.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * This work was supported in part by funding from the Defense Advanced 
+ * Research Projects Agency and the National Science Foundation of the 
+ * United States of America, and the CMU Sphinx Speech Consortium.
+ *
+ * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND 
+ * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
+ * NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * ====================================================================
+ *
+ */
+
+/**
+ * @file ngram_search_fwdtree.h Lexicon tree based Viterbi search.
+ */
+
+#ifndef __NGRAM_SEARCH_FWDTREE_H__
+#define __NGRAM_SEARCH_FWDTREE_H__
+
+/* SphinxBase headers. */
+
+/* Local headers. */
+#include "ngram_search.h"
+
+/**
+ * Initialize N-Gram search for fwdtree decoding.
+ */
+void ngram_fwdtree_init(ngram_search_t *ngs);
+
+/**
+ * Release memory associated with fwdtree decoding.
+ */
+void ngram_fwdtree_deinit(ngram_search_t *ngs);
+
+/**
+ * Rebuild search structures for updated language models.
+ */
+int ngram_fwdtree_reinit(ngram_search_t *ngs);
+
+/**
+ * Start fwdtree decoding for an utterance.
+ */
+void ngram_fwdtree_start(ngram_search_t *ngs);
+
+/**
+ * Search one frame forward in an utterance.
+ *
+ * @return Number of frames searched (either 0 or 1).
+ */
+int ngram_fwdtree_search(ngram_search_t *ngs, int frame_idx);
+
+/**
+ * Finish fwdtree decoding for an utterance.
+ */
+void ngram_fwdtree_finish(ngram_search_t *ngs);
+
+
+#endif /* __NGRAM_SEARCH_FWDTREE_H__ */