godot/drivers/speex/sb_celp.h

/* Copyright (C) 2002-2006 Jean-Marc Valin */
/**
   @file sb_celp.h
   @brief Sub-band CELP mode used for wideband encoding
*/
/*
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   are met:
   
   - Redistributions of source code must retain the above copyright
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   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
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   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,
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   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