ld8a.h

具有浮点指令的g.729语音压缩编码

 FLOAT mem[],   /* in/out: filter memory                    */
 int update_m   /* input : 0 = no memory update, 1 = update */
);

void convolve(
 FLOAT x[],             /* input : input vector x[0:l]                     */
 FLOAT h[],             /* input : impulse response or second input h[0:l] */
 FLOAT y[],             /* output: x convolved with h , y[0:l]             */
 int l                  /* input : dimension of all vectors                */
);

/*-------------------------------------------------------------*
 * Prototypes of pitch functions                               *
 *-------------------------------------------------------------*/

int pitch_ol_fast(  /* output: open loop pitch lag                        */
   FLOAT signal[],  /* input : signal used to compute the open loop pitch */
                    /*     signal[-pit_max] to signal[-1] should be known */
   int L_frame      /* input : length of frame to compute pitch           */
);

int pitch_fr3_fast(     /* output: integer part of pitch period */
 FLOAT exc[],           /* input : excitation buffer            */
 FLOAT xn[],            /* input : target vector                */
 FLOAT h[],             /* input : impulse response.            */
 int L_subfr,           /* input : Length of subframe           */
 int t0_min,            /* input : minimum value in the searched range */
 int t0_max,            /* input : maximum value in the searched range */
 int i_subfr,           /* input : indicator for first subframe        */
 int *pit_frac          /* output: chosen fraction                     */
);

FLOAT g_pitch(FLOAT xn[], FLOAT y1[], FLOAT g_coeff[], int l);

int enc_lag3(     /* output: Return index of encoding */
  int T0,         /* input : Pitch delay              */
  int T0_frac,    /* input : Fractional pitch delay   */
  int *T0_min,    /* in/out: Minimum search delay     */
  int *T0_max,    /* in/out: Maximum search delay     */
  int pit_min,    /* input : Minimum pitch delay      */
  int pit_max,    /* input : Maximum pitch delay      */
  int pit_flag    /* input : Flag for 1st subframe    */
);

void dec_lag3(     /* Decode the pitch lag                   */
  int index,       /* input : received pitch index           */
  int pit_min,     /* input : minimum pitch lag              */
  int pit_max,     /* input : maximum pitch lag              */
  int i_subfr,     /* input : subframe flag                  */
  int *T0,         /* output: integer part of pitch lag      */
  int *T0_frac     /* output: fractional part of pitch lag   */
);

void pred_lt_3(       /* Compute adaptive codebook                       */
 FLOAT exc[],         /* in/out: excitation vector, exc[0:l_sub-1] = out */
 int t0,              /* input : pitch lag                               */
 int frac,            /* input : Fraction of pitch lag (-1, 0, 1)  / 3   */
 int l_sub            /* input : length of subframe.                     */
);

int parity_pitch(int pitch_i);

int check_parity_pitch(int pitch_i, int parity);

void cor_h_x(
     FLOAT h[],         /* (i) :Impulse response of filters      */
     FLOAT X[],         /* (i) :Target vector                    */
     FLOAT D[]          /* (o) :Correlations between h[] and D[] */
);

/*-----------------------*
 * Innovative codebook.  *
 *-----------------------*/

int ACELP_code_A(       /* (o) :index of pulses positions    */
  FLOAT x[],            /* (i) :Target vector                */
  FLOAT h[],            /* (i) :Inpulse response of filters  */
  int T0,               /* (i) :Pitch lag                    */
  FLOAT pitch_sharp,    /* (i) :Last quantized pitch gain    */
  FLOAT code[],         /* (o) :Innovative codebook          */
  FLOAT y[],            /* (o) :Filtered innovative codebook */
  int *sign             /* (o) :Signs of 4 pulses            */
);

void  decod_ACELP(int signs, int positions, FLOAT cod[]);

/*-----------------------------------------------------------*
 * Prototypes of LSP VQ functions                            *
 *-----------------------------------------------------------*/
void qua_lsp(
  FLOAT lsp[],       /* (i) : Unquantized LSP            */
  FLOAT lsp_q[],     /* (o) : Quantized LSP              */
  int ana[]          /* (o) : indexes                    */
);

void lsp_encw_reset(void);

void lsp_expand_1( FLOAT buf[], FLOAT c);

void lsp_expand_2( FLOAT buf[], FLOAT c);

void lsp_expand_1_2( FLOAT buf[], FLOAT c);

void lsp_get_quant(
  FLOAT lspcb1[][M],
  FLOAT lspcb2[][M],
  int code0,
  int code1,
  int code2,
  FLOAT fg[][M],
  FLOAT freq_prev[][M],
  FLOAT lspq[],
  FLOAT fg_sum[]
);

void d_lsp(
int index[],           /* input : indexes                 */
FLOAT lsp_new[],       /* output: decoded lsp             */
int bfi                /* input : frame erase information */
);

void lsp_decw_reset(void);

void lsp_prev_extract(
  FLOAT lsp[M],
  FLOAT lsp_ele[M],
  FLOAT fg[MA_NP][M],
  FLOAT freq_prev[MA_NP][M],
  FLOAT fg_sum_inv[M]
);

void lsp_prev_update(
  FLOAT lsp_ele[M],
  FLOAT freq_prev[MA_NP][M]
);

/*--------------------------------------------------------------------------*
 * gain VQ functions.                                                       *
 *--------------------------------------------------------------------------*/
int qua_gain(FLOAT code[], FLOAT *coeff, int lcode, FLOAT *gain_pit,
        FLOAT *gain_code, int tameflag   );

void  dec_gain(int indice, FLOAT code[], int lcode, int bfi, FLOAT *gain_pit,
               FLOAT *gain_code);

void gain_predict(
  FLOAT past_qua_en[],  /* input :Past quantized energies       */
  FLOAT code[],         /* input: Innovative vector.            */
  int l_subfr,          /* input : Subframe length.             */
  FLOAT *gcode0         /* output : Predicted codebook gain     */
);

void gain_update(
  FLOAT past_qua_en[], /* input/output :Past quantized energies  */
  FLOAT g_code         /* input        : quantized gain          */
);

void gain_update_erasure(FLOAT *past_qua_en);

void  corr_xy2(FLOAT xn[], FLOAT y1[], FLOAT y2[], FLOAT g_coeff[]);

/*-----------------------*
 * Bitstream function    *
 *-----------------------*/
void  prm2bits_ld8k(int prm[], INT16 bits[]);

void  bits2prm_ld8k(INT16 bits[], int prm[]);

/*-----------------------------------------------------------*
 * Prototypes for the post filtering                         *
 *-----------------------------------------------------------*/

void init_post_filter(void);

void post_filter(
  FLOAT *syn,     /* in/out: synthesis speech (postfiltered is output)    */
  FLOAT *a_t,     /* input : interpolated LPC parameters in all subframes */
  int *T          /* input : decoded pitch lags in all subframes          */
);

/*------------------------------------------------------------*
 * prototypes for taming procedure.                           *
 *------------------------------------------------------------*/

void   init_exc_err(void);

void   update_exc_err(FLOAT gain_pit, int t0);

int test_err(int t0, int t0_frac);

/*-----------------------------------------------------------*
 * Prototypes for auxiliary functions                        *
 *-----------------------------------------------------------*/

void set_zero(
  FLOAT  x[],           /* (o)  : vector to clear  */
  int L                 /* (i)  : length of vector */
);

void copy(
  FLOAT  x[],           /* (i)  : input vector   */
  FLOAT  y[],           /* (o)  : output vector  */
  int L                 /* (i)  : vector length  */
);
INT16 random_g729(void);

void fwrite16(
 FLOAT *data,           /* input: inputdata            */
 int length,            /* input: length of data array */
 FILE *fp               /* input: file pointer         */
);