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diff --git a/engine/voice_codecs/speex/source/libspeex/nb_celp.h b/engine/voice_codecs/speex/source/libspeex/nb_celp.h
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+/* Copyright (C) 2002 Jean-Marc Valin */
+/**
+    @file nb_celp.h
+    @brief Narrowband CELP encoder/decoder
+*/
+/*
+   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 NB_CELP_H
+#define NB_CELP_H
+
+#include "modes.h"
+#include "speex_bits.h"
+#include "speex_callbacks.h"
+#include "vbr.h"
+#include "filters.h"
+
+/**Structure representing the full state of the narrowband encoder*/
+typedef struct EncState {
+   SpeexMode *mode;       /**< Mode corresponding to the state */
+   int    first;          /**< Is this the first frame? */
+   int    frameSize;      /**< Size of frames */
+   int    subframeSize;   /**< Size of sub-frames */
+   int    nbSubframes;    /**< Number of sub-frames */
+   int    windowSize;     /**< Analysis (LPC) window length */
+   int    lpcSize;        /**< LPC order */
+   int    bufSize;        /**< Buffer size */
+   int    min_pitch;      /**< Minimum pitch value allowed */
+   int    max_pitch;      /**< Maximum pitch value allowed */
+
+   int    safe_pitch;     /**< Don't use too large values for pitch (in case we lose a packet) */
+   int    bounded_pitch;  /**< Next frame should not rely on previous frames for pitch */
+   int    ol_pitch;       /**< Open-loop pitch */
+   int    ol_voiced;      /**< Open-loop voiced/non-voiced decision */
+   int   *pitch;
+   float  gamma1;         /**< Perceptual filter: A(z/gamma1) */
+   float  gamma2;         /**< Perceptual filter: A(z/gamma2) */
+   float  lag_factor;     /**< Lag windowing Gaussian width */
+   float  lpc_floor;      /**< Noise floor multiplier for A[0] in LPC analysis*/
+   float  preemph;        /**< Pre-emphasis: P(z) = 1 - a*z^-1*/
+   float  pre_mem;        /**< 1-element memory for pre-emphasis */
+   float  pre_mem2;       /**< 1-element memory for pre-emphasis */
+   char  *stack;          /**< Pseudo-stack allocation for temporary memory */
+   float *inBuf;          /**< Input buffer (original signal) */
+   float *frame;          /**< Start of original frame */
+   float *excBuf;         /**< Excitation buffer */
+   float *exc;            /**< Start of excitation frame */
+   float *exc2Buf;        /**< "Pitch enhanced" excitation */
+   float *exc2;           /**< "Pitch enhanced" excitation */
+   float *swBuf;          /**< Weighted signal buffer */
+   float *sw;             /**< Start of weighted signal frame */
+   float *innov;          /**< Innovation for the frame */
+   float *window;         /**< Temporary (Hanning) window */
+   float *buf2;           /**< 2nd temporary buffer */
+   float *autocorr;       /**< auto-correlation */
+   float *lagWindow;      /**< Window applied to auto-correlation */
+   float *lpc;            /**< LPCs for current frame */
+   float *lsp;            /**< LSPs for current frame */
+   float *qlsp;           /**< Quantized LSPs for current frame */
+   float *old_lsp;        /**< LSPs for previous frame */
+   float *old_qlsp;       /**< Quantized LSPs for previous frame */
+   float *interp_lsp;     /**< Interpolated LSPs */
+   float *interp_qlsp;    /**< Interpolated quantized LSPs */
+   float *interp_lpc;     /**< Interpolated LPCs */
+   float *interp_qlpc;    /**< Interpolated quantized LPCs */
+   float *bw_lpc1;        /**< LPCs after bandwidth expansion by gamma1 for perceptual weighting*/
+   float *bw_lpc2;        /**< LPCs after bandwidth expansion by gamma2 for perceptual weighting*/
+   float *rc;             /**< Reflection coefficients */
+   float *mem_sp;         /**< Filter memory for signal synthesis */
+   float *mem_sw;         /**< Filter memory for perceptually-weighted signal */
+   float *mem_sw_whole;   /**< Filter memory for perceptually-weighted signal (whole frame)*/
+   float *mem_exc;        /**< Filter memory for excitation (whole frame) */
+   float *pi_gain;        /**< Gain of LPC filter at theta=pi (fe/2) */
+
+   VBRState *vbr;         /**< State of the VBR data */
+   float  vbr_quality;    /**< Quality setting for VBR encoding */
+   float  relative_quality; /**< Relative quality that will be needed by VBR */
+   int    vbr_enabled;    /**< 1 for enabling VBR, 0 otherwise */
+   int    vad_enabled;    /**< 1 for enabling VAD, 0 otherwise */
+   int    dtx_enabled;    /**< 1 for enabling DTX, 0 otherwise */
+   int    dtx_count;      /**< Number of consecutive DTX frames */
+   int    abr_enabled;    /**< ABR setting (in bps), 0 if off */
+   float  abr_drift;
+   float  abr_drift2;
+   float  abr_count;
+   int    complexity;     /**< Complexity setting (0-10 from least complex to most complex) */
+   int    sampling_rate;
+
+   SpeexSubmode **submodes; /**< Sub-mode data */
+   int    submodeID;      /**< Activated sub-mode */
+   int    submodeSelect;  /**< Mode chosen by the user (may differ from submodeID if VAD is on) */
+} EncState;
+
+/**Structure representing the full state of the narrowband decoder*/
+typedef struct DecState {
+   SpeexMode *mode;       /**< Mode corresponding to the state */
+   int    first;          /**< Is this the first frame? */
+   int    count_lost;     /**< Was the last frame lost? */
+   int    frameSize;      /**< Size of frames */
+   int    subframeSize;   /**< Size of sub-frames */
+   int    nbSubframes;    /**< Number of sub-frames */
+   int    windowSize;     /**< Analysis (LPC) window length */
+   int    lpcSize;        /**< LPC order */
+   int    bufSize;        /**< Buffer size */
+   int    min_pitch;      /**< Minimum pitch value allowed */
+   int    max_pitch;      /**< Maximum pitch value allowed */
+   int    sampling_rate;
+   float  last_ol_gain;   /**< Open-loop gain for previous frame */
+
+
+   float  gamma1;         /**< Perceptual filter: A(z/gamma1) */
+   float  gamma2;         /**< Perceptual filter: A(z/gamma2) */
+   float  preemph;        /**< Pre-emphasis: P(z) = 1 - a*z^-1*/
+   float  pre_mem;        /**< 1-element memory for pre-emphasis */
+   char  *stack;          /**< Pseudo-stack allocation for temporary memory */
+   float *inBuf;          /**< Input buffer (original signal) */
+   float *frame;          /**< Start of original frame */
+   float *excBuf;         /**< Excitation buffer */
+   float *exc;            /**< Start of excitation frame */
+   float *innov;          /**< Innovation for the frame */
+   float *qlsp;           /**< Quantized LSPs for current frame */
+   float *old_qlsp;       /**< Quantized LSPs for previous frame */
+   float *interp_qlsp;    /**< Interpolated quantized LSPs */
+   float *interp_qlpc;    /**< Interpolated quantized LPCs */
+   float *mem_sp;         /**< Filter memory for synthesis signal */
+   float *pi_gain;        /**< Gain of LPC filter at theta=pi (fe/2) */
+   int    last_pitch;     /**< Pitch of last correctly decoded frame */
+   float  last_pitch_gain; /**< Pitch gain of last correctly decoded frame */
+   float  pitch_gain_buf[3];  /**< Pitch gain of last decoded frames */
+   int    pitch_gain_buf_idx; /**< Tail of the buffer */
+
+   SpeexSubmode **submodes; /**< Sub-mode data */
+   int    submodeID;      /**< Activated sub-mode */
+   int    lpc_enh_enabled; /**< 1 when LPC enhancer is on, 0 otherwise */
+   CombFilterMem *comb_mem;
+   SpeexCallback speex_callbacks[SPEEX_MAX_CALLBACKS];
+
+   SpeexCallback user_callback;
+
+   /*Vocoder data*/
+   float  voc_m1;
+   float  voc_m2;
+   float  voc_mean;
+   int    voc_offset;
+
+   int    dtx_enabled;
+} DecState;
+
+/** Initializes encoder state*/
+void *nb_encoder_init(SpeexMode *m);
+
+/** De-allocates encoder state resources*/
+void nb_encoder_destroy(void *state);
+
+/** Encodes one frame*/
+int nb_encode(void *state, float *in, SpeexBits *bits);
+
+
+/** Initializes decoder state*/
+void *nb_decoder_init(SpeexMode *m);
+
+/** De-allocates decoder state resources*/
+void nb_decoder_destroy(void *state);
+
+/** Decodes one frame*/
+int nb_decode(void *state, SpeexBits *bits, float *out);
+
+/** ioctl-like function for controlling a narrowband encoder */
+int nb_encoder_ctl(void *state, int request, void *ptr);
+
+/** ioctl-like function for controlling a narrowband decoder */
+int nb_decoder_ctl(void *state, int request, void *ptr);
+
+
+#endif