ld8e.h

E729国际标准的语音编码

  Word16 lspcb2[][M],            /* (i) Q13 : Second stage LSP codebook  */
  Word16 fg[MODE][MA_NP][M],     /* (i) Q15 : MA prediction coefficients */
  Word16 freq_prev[MA_NP][M],    /* (i) Q13 : previous LSP vector        */
  Word16 fg_sum[MODE][M],        /* (i) Q15 : present MA prediction coef.*/
  Word16 fg_sum_inv[MODE][M],    /* (i) Q12 : inverse coef.              */
  Word16 code_ana[],                 /* (o)     : codes of the selected LSP  */
  Word16 freq_cur[]             /* (o) Q13 : current LSP MA vector        */
);

void D_lspe(
  Word16 prm[],          /* (i)     : indexes of the selected LSP */
  Word16 lsp_q[],        /* (o) Q15 : Quantized LSP parameters    */
  Word16 erase,           /* (i)     : frame erase information     */
  Word16 freq_prev[MA_NP][M],    /* (i/o) Q13 : previous LSP MA vector        */
  Word16 prev_lsp[],            /* (i/o) Q13 : previous LSP vector        */
  Word16 *prev_ma               /* (i/o) previous MA prediction coef.*/
);
void Lsp_decw_resete(
  Word16 freq_prev[MA_NP][M],    /* (o) Q13 : previous LSP MA vector        */
  Word16 prev_lsp[],            /* (o) Q13 : previous LSP vector        */
  Word16 *prev_ma               /* previous MA prediction coef.*/
);
void Lsp_iqua_cse(
 Word16 prm[],          /* (i)     : indexes of the selected LSP */
 Word16 lsp_q[],        /* (o) Q13 : Quantized LSP parameters    */
 Word16 erase,           /* (i)     : frame erase information     */
  Word16 freq_prev[MA_NP][M],    /* (i/o) Q13 : previous LSP MA vector        */
  Word16 prev_lsp[],            /* (i/o) Q13 : previous LSP vector        */
  Word16 *prev_ma               /* (i/o) previous MA prediction coef.*/
);
/*--------------------------------------------------------------------------*
 * Postfilter functions                                                     *
 *--------------------------------------------------------------------------*/
void Poste(
  Word16 t0,        /* (i) : 1st subframe delay given by coder              */
  Word16 *signal_ptr, /* (i) : input signal (pointer to current subframe    */
  Word16  *coeff,    /* (i) : LPC coefficients for current subframe          */
  Word16 *sig_out,  /* (o) : postfiltered output                            */
  Word16 *vo,        /* (o) : voicing decision 0 = uv,  > 0 delay            */
  Word16 gamma1,            /* input: short term postfilt. den. weighting factor*/
  Word16 gamma2,            /* input: short term postfilt. num. weighting factor*/
  Word16 gamma_harm,        /* input: long term postfilter weighting factor*/
  Word16  long_h_st,    /* input: impulse response length*/
  Word16 m_pst          /* input:  LPC order */
);
/*--------------------------------------------------------------------------*
 * protypes of functions  containing G729 source code + specific G729E code *
 *--------------------------------------------------------------------------*/

/*--------------------------------------------------------------------------*
 * gain VQ functions.                                                       *
 *--------------------------------------------------------------------------*/
void Dec_gaine(
   Word16 index,        /* (i)     :Index of quantization.         */
   Word16 code[],       /* (i) Q13 :Innovative vector.             */
   Word16 L_subfr,      /* (i)     :Subframe length.               */
   Word16 bfi,          /* (i)     :Bad frame indicator            */
   Word16 *gain_pit,    /* (o) Q14 :Pitch gain.                    */
   Word16 *gain_cod,     /* (o) Q1  :Code gain.                     */
   Word16 rate,             /* input   : rate selector/frame  =0 8kbps,= 1 11.8 kbps*/
   Word16 gain_pit_mem,
   Word16 gain_cod_mem,
   Word16  *c_muting,
   int      count_bfi,
   int      stationnary
);

/*--------------------------------------------------------------------------*
 * Bitstream functions                                                      *
 *--------------------------------------------------------------------------*/
void bits2prm_ld8e(
    Word16 bits[],  /* I   serial bits (nb_bits)                          */
    Word16 prm[],   /* O   output: decoded parameters (11 parameters)     */
    Word16 rate             /* input   : rate selector/frame  =0 8kbps,= 1 11.8 kbps*/
);


void  prm2bits_ld8e(
  Word16 prm[],           /* input : encoded parameters  (PRM_SIZE parameters)  */
  Word16 bits[],          /* output: serial bits (SERIAL_SIZE ) bits[0] = bfi
                                    bits[1] = nbbits */
  Word16 rate           /* input   : rate selector/frame  =0 8kbps,= 1 11.8 kbps*/
);

/*--------------------------------------------------------------------------*
 * functions  specific to G729E                                             *
 *--------------------------------------------------------------------------*/
/* backward LPC analysis and switch forward/backward */
void autocorr_hyb_window(
    Word16  *x,         /* Input speech signal  */
    Word32  *r_bwd,        /* (out)    Autocorrelations    */
    Word32 *rexp        /* (in/out) */
);
void Lag_window_bwd(Word32 *r_bwd, Word16 *r_h_bwd, Word16 *r_l_bwd);
void Int_bwd(Word16 *a_bwd, Word16 *prev_filter, Word16 *C_int );

void set_lpc_mode(Word16 *signal_ptr, Word16 *a_fwd, Word16 *a_bwd,
  Word16 *bwd, Word16 *lspnew, Word16 *lspold, Word16 rate,
  Word16 *high_stat, Word16 prev_mode, Word16 *prev_filter, Word16 *C_int,
  Word16 *glob_stat, Word16 *stat_bwd, Word16 *val_stat_bwd);
Word16 ener_dB(Word16 *synth, Word16 L);
void tst_bwd_dominant(Word16 *high_stat, Word16 mode);

void perc_vare (
  Word16 *gamma1,   /* Bandwidth expansion parameter */
  Word16 *gamma2,   /* Bandwidth expansion parameter */
  Word16  high_stat /* high_stat indication (see file bwfw.c) */
);

/*--------------------------------------------------------------------------*
 * G729E fixed (ACELP) codebook excitation.                                               *
 *--------------------------------------------------------------------------*/

void ACELP_12i40_44bits(
  Word16 x[],    /* (i) Q0 : target vector                                 */
  Word16 cn[],   /* (i) Q0 : residual after long term prediction           */
  Word16 H[],    /* (i) Q12: impulse response of weighted synthesis filter */
  Word16 code[], /* (o) Q12: algebraic (fixed) codebook excitation         */
  Word16 y[],    /* (o) Q11: filtered fixed codebook excitation            */
  Word16 indx[]  /* (o)    : index 5 words: 13,10,7,7,7 = 44 bits          */
);
void ACELP_10i40_35bits(
  Word16 x[],    /* (i) Q0 : target vector                                 */
  Word16 cn[],   /* (i) Q0 : residual after long term prediction           */
  Word16 H[],    /* (i) Q12: impulse response of weighted synthesis filter */
  Word16 code[], /* (o) Q12: algebraic (fixed) codebook excitation         */
  Word16 y[],    /* (o) Q11: filtered fixed codebook excitation            */
  Word16 indx[]  /* (o)    : index 5 words: 7,7,7,7,7 = 35 bits            */
);
void Dec_ACELP_12i40_44bits(
  Word16 *index,  /* (i)     : 5 words index (positions & sign)      */
  Word16 cod[]    /* (o) Q13 : algebraic (fixed) codebook excitation */
);
void Dec_ACELP_10i40_35bits(
  Word16 *index,  /* (i)     : 5 words index (positions & sign)      */
  Word16 cod[]    /* (o) Q13 : algebraic (fixed) codebook excitation */
);
/* pitch tracking routine */
void track_pit(Word16 *T0, Word16 *T0_frac, Word16 *prev_pitch,
        Word16 *stat_pitch, Word16 *pitch_sta,  Word16 *frac_sta);