cst_lbc.h

语音编解码算法G.723.1的C语言算法原代码

/*
**
** File:        "cst_lbc.h"
**
** Description:  This file contains global definition of the SG15
**    LBC Coder for 6.3/5.3 kbps.
**
*/


/*
    ITU-T G.723 Speech Coder   ANSI-C Source Code     Version 4.1
    copyright (c) 1995, AudioCodes, DSP Group, France Telecom,
    Universite de Sherbrooke.  All rights reserved.
*/

#define  False 0
#define  True  1

/* Definition of the working mode */
enum  Wmode { Both, Cod, Dec } ;

/* Coder rate */
enum  Crate    { Rate63, Rate53 } ;

/* Coder global constants */
#define  Frame       240
#define  LpcFrame    180
#define  SubFrames   4
#define  SubFrLen    (Frame/SubFrames)

/* LPC constants */
#define  LpcOrder          10
#define  RidgeFact         10
#define  CosineTableSize   512
#define  PreCoef           (Word16) 0xc000            /* -0.25*2 */

#define  LspPrd0           12288
#define  LspPrd1           23552

#define  LspQntBands       3
#define  LspCbSize         256
#define  LspCbBits         8

/* LTP constants */
#define  PitchMin          18
#define  PitchMax          (PitchMin+127)
#define  PwConst           (Word16) 0x2800
#define  PwRange            3
#define  ClPitchOrd        5
#define  Pstep             1
#define NbFilt085           85
#define NbFilt170           170

/* MP-MLQ constants */
#define  Sgrid             2
#define  MaxPulseNum       6
#define  MlqSteps       2

/* acelp constants */
#define SubFrLen2    (SubFrLen +4)
#define DIM_RR   416
#define NB_POS   8
#define STEP     8
#define MSIZE    64
#define threshold  16384  /* 0.5 = 16384 in Q15 */
#define max_time   120

/* Gain constant */
#define  NumOfGainLev      24

/* FER constant */
#define  ErrMaxNum         3

/* Taming constants */
#define NbFilt085_min       51
#define NbFilt170_min       93
#define SizErr              5
#define Err0                (Word32)4  /* scaling factor */
#define ThreshErr           0x40000000L
#define DEC                 (30 - 7)

/*
   Used structures
*/
typedef  struct   {
   /* High pass variables */
   Word16   HpfZdl   ;
   Word32   HpfPdl   ;

   /* Sine wave detector */
   Word16   SinDet   ;

   /* Lsp previous vector */
   Word16   PrevLsp[LpcOrder] ;

   /* All pitch operation buffers */
   Word16   PrevWgt[PitchMax] ;
   Word16   PrevErr[PitchMax] ;
   Word16   PrevExc[PitchMax] ;

   /* Required memory for the delay */
   Word16   PrevDat[LpcFrame-SubFrLen] ;

   /* Used delay lines */
   Word16   WghtFirDl[LpcOrder] ;
   Word16   WghtIirDl[LpcOrder] ;
   Word16   RingFirDl[LpcOrder] ;
   Word16   RingIirDl[LpcOrder] ;

   /* Taming procedure errors */
   Word32 Err[SizErr];

   } CODSTATDEF  ;

typedef  struct   {
   Word16   Ecount ;
   Word16   InterGain ;
   Word16   InterIndx ;
   Word16   Rseed ;
   Word16   Park  ;
   Word16   Gain  ;
   /* Lsp previous vector */
   Word16   PrevLsp[LpcOrder] ;

   /* All pitch operation buffers */
   Word16   PrevExc[PitchMax] ;

   /* Used delay lines */
   Word16   SyntIirDl[LpcOrder] ;
   Word16   PostFirDl[LpcOrder] ;
   Word16   PostIirDl[LpcOrder] ;

   } DECSTATDEF  ;

   /* subframe coded parameters */
typedef  struct   {
   Word16   AcLg  ;
   Word16   AcGn  ;
   Word16   Mamp  ;
   Word16   Grid  ;
   Word16   Tran  ;
   Word16   Pamp  ;
   Word32   Ppos  ;
   } SFSDEF ;

   /* frame coded parameters */
typedef  struct   {
   Word16   Crc   ;
   Word32   LspId ;
   Word16   Olp[SubFrames/2] ;
   SFSDEF   Sfs[SubFrames] ;
   } LINEDEF ;

   /* harmonic noise shaping filter parameters */
typedef  struct   {
   Word16   Indx  ;
   Word16   Gain  ;
   } PWDEF  ;

   /* pitch postfilter parameters */
typedef  struct   {
   Word16   Indx  ;
   Word16   Gain  ;
   Word16   ScGn  ;
   } PFDEF  ;

   /* best excitation vector parameters for the high rate */
typedef  struct {
   Word32   MaxErr   ;
   Word16   GridId   ;
   Word16   MampId   ;
   Word16   UseTrn   ;
   Word16   Ploc[MaxPulseNum] ;
   Word16   Pamp[MaxPulseNum] ;
   } BESTDEF ;