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diff --git a/engine/voice_codecs/speex/source/libspeex/speex_stereo.h b/engine/voice_codecs/speex/source/libspeex/speex_stereo.h
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+/* Copyright (C) 2002 Jean-Marc Valin*/
+/**
+   @file speex_stereo.h
+   @brief Describes the handling for intensity stereo
+*/
+/*
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+   
+   - Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+   
+   - 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.
+   
+   - Neither the name of the Xiph.org Foundation nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+   
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+   ``AS IS'' AND ANY EXPRESS 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 THE FOUNDATION OR
+   CONTRIBUTORS 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.
+*/
+
+#ifndef STEREO_H
+#define STEREO_H
+
+#include "speex_bits.h"
+
+/** State used for decoding (intensity) stereo information */
+typedef struct SpeexStereoState {
+   float balance;      /**< Left/right balance info */
+   float e_ratio;      /**< Ratio of energies: E(left+right)/[E(left)+E(right)]  */
+   float smooth_left;  /**< Smoothed left channel gain */
+   float smooth_right; /**< Smoothed right channel gain */
+   float reserved1;    /**< Reserved for future use */
+   float reserved2;    /**< Reserved for future use */
+} SpeexStereoState;
+
+/** Initialization value for a stereo state */
+#define SPEEX_STEREO_STATE_INIT {1,.5,1,1}
+
+/** Transforms a stereo frame into a mono frame and stores intensity stereo info in 'bits' */
+void speex_encode_stereo(float *data, int frame_size, SpeexBits *bits);
+
+/** Transforms a mono frame into a stereo frame using intensity stereo info */
+void speex_decode_stereo(float *data, int frame_size, SpeexStereoState *stereo);
+
+/** Callback handler for intensity stereo info */
+int speex_std_stereo_request_handler(SpeexBits *bits, void *state, void *data);
+
+#endif