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+/* Copyright (C) 2002-2006 Jean-Marc Valin */
+/**
+   @file sb_celp.h
+   @brief Sub-band CELP mode used for wideband encoding
+*/
+/*
+   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 SB_CELP_H
+#define SB_CELP_H
+
+#include "modes.h"
+#include <speex/speex_bits.h>
+#include "nb_celp.h"
+
+/**Structure representing the full state of the sub-band encoder*/
+typedef struct SBEncState {
+   const SpeexMode *mode;         /**< Pointer to the mode (containing for vtable info) */
+   void *st_low;                  /**< State of the low-band (narrowband) encoder */
+   int    full_frame_size;        /**< Length of full-band frames*/
+   int    frame_size;             /**< Length of high-band frames*/
+   int    subframeSize;           /**< Length of high-band sub-frames*/
+   int    nbSubframes;            /**< Number of high-band sub-frames*/
+   int    windowSize;             /**< Length of high-band LPC window*/
+   int    lpcSize;                /**< Order of high-band LPC analysis */
+   int    first;                  /**< First frame? */
+   spx_word16_t  lpc_floor;       /**< Controls LPC analysis noise floor */
+   spx_word16_t  gamma1;          /**< Perceptual weighting coef 1 */
+   spx_word16_t  gamma2;          /**< Perceptual weighting coef 2 */
+
+   char  *stack;                  /**< Temporary allocation stack */
+   spx_word16_t *high;               /**< High-band signal (buffer) */
+   spx_word16_t *h0_mem, *h1_mem;
+
+   const spx_word16_t *window;    /**< LPC analysis window */
+   const spx_word16_t *lagWindow;       /**< Auto-correlation window */
+   spx_lsp_t *old_lsp;            /**< LSPs of previous frame */
+   spx_lsp_t *old_qlsp;           /**< Quantized LSPs of previous frame */
+   spx_coef_t *interp_qlpc;       /**< Interpolated quantized LPCs for current sub-frame */
+
+   spx_mem_t *mem_sp;             /**< Synthesis signal memory */
+   spx_mem_t *mem_sp2;
+   spx_mem_t *mem_sw;             /**< Perceptual signal memory */
+   spx_word32_t *pi_gain;
+   spx_word16_t *exc_rms;
+   spx_word16_t *innov_rms_save;         /**< If non-NULL, innovation is copied here */
+
+#ifndef DISABLE_VBR
+   float  vbr_quality;            /**< Quality setting for VBR encoding */
+   int    vbr_enabled;            /**< 1 for enabling VBR, 0 otherwise */
+   spx_int32_t vbr_max;           /**< Max bit-rate allowed in VBR mode (total) */
+   spx_int32_t vbr_max_high;      /**< Max bit-rate allowed in VBR mode for the high-band */
+   spx_int32_t abr_enabled;       /**< ABR setting (in bps), 0 if off */
+   float  abr_drift;
+   float  abr_drift2;
+   float  abr_count;
+   int    vad_enabled;            /**< 1 for enabling VAD, 0 otherwise */
+   float  relative_quality;
+#endif /* #ifndef DISABLE_VBR */
+   
+   int    encode_submode;
+   const SpeexSubmode * const *submodes;
+   int    submodeID;
+   int    submodeSelect;
+   int    complexity;
+   spx_int32_t sampling_rate;
+
+} SBEncState;
+
+
+/**Structure representing the full state of the sub-band decoder*/
+typedef struct SBDecState {
+   const SpeexMode *mode;            /**< Pointer to the mode (containing for vtable info) */
+   void *st_low;               /**< State of the low-band (narrowband) encoder */
+   int    full_frame_size;
+   int    frame_size;
+   int    subframeSize;
+   int    nbSubframes;
+   int    lpcSize;
+   int    first;
+   spx_int32_t sampling_rate;
+   int    lpc_enh_enabled;
+
+   char  *stack;
+   spx_word16_t *g0_mem, *g1_mem;
+
+   spx_word16_t *excBuf;
+   spx_lsp_t *old_qlsp;
+   spx_coef_t *interp_qlpc;
+
+   spx_mem_t *mem_sp;
+   spx_word32_t *pi_gain;
+   spx_word16_t *exc_rms;
+   spx_word16_t *innov_save;      /** If non-NULL, innovation is copied here */
+   
+   spx_word16_t last_ener;
+   spx_int32_t seed;
+
+   int    encode_submode;
+   const SpeexSubmode * const *submodes;
+   int    submodeID;
+} SBDecState;
+
+
+/**Initializes encoder state*/
+void *sb_encoder_init(const SpeexMode *m);
+
+/**De-allocates encoder state resources*/
+void sb_encoder_destroy(void *state);
+
+/**Encodes one frame*/
+int sb_encode(void *state, void *in, SpeexBits *bits);
+
+
+/**Initializes decoder state*/
+void *sb_decoder_init(const SpeexMode *m);
+
+/**De-allocates decoder state resources*/
+void sb_decoder_destroy(void *state);
+
+/**Decodes one frame*/
+int sb_decode(void *state, SpeexBits *bits, void *out);
+
+int sb_encoder_ctl(void *state, int request, void *ptr);
+
+int sb_decoder_ctl(void *state, int request, void *ptr);
+
+#endif