ld8e.h

E729国际标准的语音编码

/* Version 1.1    Last modified: February 1998 */

/*--------------------------------------------------------------*
 * LD8E.H                                                       *
 * ~~~~~~                                                       *
 * Function prototypes and constants use in G.729E              *
 *                                                              *
 *--------------------------------------------------------------*/

/*--------------------------------------------------------------------------*
 *       Codec constant parameters (coder, decoder, and postfilter)         *
 *--------------------------------------------------------------------------*/
 /* bitstream paramaters */
#define PRM_SIZE_E_fwd  18       /* Size of vector of analysis parameters.    */
#define PRM_SIZE_E_bwd  16       /* Size of vector of analysis parameters.    */
#define PRM_SIZE_E      18       /* Size of vector of analysis parameters.    */

#define SERIAL_SIZE_E (116+4)  /* Bits/frame + bfi+ number of speech bits
                                             + bit de mode + protection */

/* backward LPC analysis parameters */
#define M_BWD       30         /* Order of Backward LP filter.              */
#define M_BWDP1     (M_BWD+1)  /* Order of Backward LP filter + 1           */
#define NRP         35
#define MEM_SYN_BWD     M_BWD + NRP
#define N1              M_BWD + L_FRAME
#define L_ANA_BWD       L_FRAME + MEM_SYN_BWD
#define L_ANA_BWD_M1    L_ANA_BWD - 1
#define W_FACT  10368
#define GAMMA_BWD 32113

/* short term pst parameters :                                              */
#define GAMMA1_PST_E  22938      /* denominator weighting factor   (Q15)      */
#define GAMMA2_PST_E  21300      /* numerator  weighting factor (Q15)         */
#define LONG_H_ST_E   32        /* impulse response length                   */
#define GAMMA_HARM_E 8192
#define GAMMA_HARM 16384

/* ACELP codebooks parameters */
#define NB_TRACK  5
#define Q15_1_5   6554

/*--------------------------------------------------------------------------*
 * Main coder and decoder functions                                         *
 *--------------------------------------------------------------------------*/
void Init_Coder_ld8e(void);

void Coder_ld8e(
  Word16 ana[],     /* (o)     : analysis parameters                        */
  Word16 rate           /* input   : rate selector/frame  =0 8kbps,= 1 11.8 kbps*/
);

void Init_Decod_ld8e(void);

void Decod_ld8e(
  Word16 parm[],   /* (i)     : vector of synthesis parameters
                                  parm[0] = bad frame indicator (bfi)      */
  Word16 rate,          /* input   : rate selector/frame  =0 8kbps,= 1 11.8 kbps*/
  Word16 voicing,  /* (i)     : voicing decision from previous frame       */
  Word16 synth[],  /* (o)     : synthesized speech                         */
  Word16  A_t[],    /* (o)     : decoded LP filter for 2 subframes          */
  Word16 *T0_first, /* (o)     : decoded pitch lag in first subframe        */
  Word16 *stationnary,  /* output:  stationnarity indicator */
  Word16 *m_pst         /* output:  LPC order */
);

/*--------------------------------------------------------------------------*
 * protypes of functions  similar to G729                                   *
 * differences :                                                            *
 * list of arguments modified                                               *
 * local static variables and arrays are now passed as parameters           *
 * LPC order formerly constant is now passed as variable parameter          *
 * some temporary variables are now passed to the calling routine           *
 *--------------------------------------------------------------------------*/

/*--------------------------------------------------------------------------*
 * LPC analysis and filtering                                               *
 *--------------------------------------------------------------------------*/
void Levinsone(
  Word16 m,        /* (i)    : LPC order                         */
  Word16 Rh[],      /* (i)     : Rh[m+1] autocorrelation coefficients (msb) */
  Word16 Rl[],      /* (i)     : Rl[m+1] autocorrelation coefficients (lsb) */
  Word16 A[],       /* (o) Q12 : A[m]    LPC coefficients  (m = 10)         */
  Word16 rc[],       /* (o) Q15 : rc[M]   Reflection coefficients.           */
  Word16 old_A[], /* (i/o) Q12 : last stable filter LPC coefficients  */
  Word16 old_rc[] /* (i/o) Q15 : last stable filter Reflection coefficients.         */
);

void Residue(
  Word16 m,        /* (i)    : LPC order                         */
  Word16 a[],    /* (i) Q12 : prediction coefficients                     */
  Word16 x[],    /* (i)     : speech (values x[-m..-1] are needed         */
  Word16 y[],    /* (o)     : residual signal                             */
  Word16 lg      /* (i)     : size of filtering                           */
);
void Syn_filte(
  Word16 m,        /* (i)    : LPC order                         */
  Word16 a[],     /* (i) Q12 : a[m+1] prediction coefficients   (m=10)  */
  Word16 x[],     /* (i)     : input signal                             */
  Word16 y[],     /* (o)     : output signal                            */
  Word16 lg,      /* (i)     : size of filtering                        */
  Word16 mem[],   /* (i/o)   : memory associated with this filtering.   */
  Word16 update   /* (i)     : 0=no update, 1=update of memory.         */
);

/*--------------------------------------------------------------------------*
 * LSP VQ functions.                                                        *
 *--------------------------------------------------------------------------*/
void Qua_lspe(
  Word16 lsp[],     /* (i) Q15 : Unquantized LSP                            */
  Word16 lsp_q[],   /* (o) Q15 : Quantized LSP                              */
  Word16 ana[],      /* (o)     : indexes                                    */
  Word16 freq_prev[MA_NP][M],    /* (i) Q13 : previous LSP MA vector        */
  Word16 freq_cur[]   /* (o) Q13 : current LSP MA vector        */
);
void Lsp_encw_resete(
  Word16 freq_prev[MA_NP][M]    /* (i) Q13 : previous LSP MA vector        */
);
void Lsp_qua_cse(
  Word16 flsp_in[M],    /* (i) Q13 : Original LSP parameters    */
  Word16 lspq_out[M],   /* (o) Q13 : Quantized LSP parameters   */
  Word16 *code,         /* (o)     : codes of the selected LSP  */
  Word16 freq_prev[MA_NP][M],    /* (i) Q13 : previous LSP MA vector        */
  Word16 freq_cur[]     /* (o) Q13 : current LSP MA vector        */
);
void Lsp_get_quante(
  Word16 lspcb1[][M],      /* (i) Q13 : first stage LSP codebook      */
  Word16 lspcb2[][M],      /* (i) Q13 : Second stage LSP codebook     */
  Word16 code0,               /* (i)     : selected code of first stage  */
  Word16 code1,               /* (i)     : selected code of second stage */
  Word16 code2,               /* (i)     : selected code of second stage */
  Word16 fg[][M],          /* (i) Q15 : MA prediction coef.           */
  Word16 freq_prev[][M],   /* (i) Q13 : previous LSP vector           */
  Word16 lspq[],              /* (o) Q13 : quantized LSP parameters      */
  Word16 fg_sum[],             /* (i) Q15 : present MA prediction coef.   */
  Word16 freq_cur[]             /* (i) Q15 : present MA prediction coef.   */
);
void Relspwede(
  Word16 lsp[],                     /* (i) Q13 : unquantized LSP parameters */
  Word16 wegt[],                    /* (i) norm: weighting coefficients     */
  Word16 lspq[],                    /* (o) Q13 : quantized LSP parameters   */
  Word16 lspcb1[][M],            /* (i) Q13 : first stage LSP codebook   */