?? ld8a.h
字號(hào):
/*
ITU-T G.729A Speech Coder ANSI-C Source Code
Version 1.1 Last modified: September 1996
Copyright (c) 1996,
AT&T, France Telecom, NTT, Universite de Sherbrooke
All rights reserved.
*/
/*---------------------------------------------------------------*
* LD8A.H *
* ~~~~~~ *
* Function prototypes and constants use for G.729A 8kb/s coder. *
* *
*---------------------------------------------------------------*/
/*--------------------------------------------------------------------------*
* Codec constant parameters (coder, decoder, and postfilter) *
*--------------------------------------------------------------------------*/
#define L_TOTAL 240 /* Total size of speech buffer. */
#define L_WINDOW 240 /* Window size in LP analysis. */
#define L_NEXT 40 /* Lookahead in LP analysis. */
#define L_FRAME 80 /* Frame size. */
#define L_SUBFR 40 /* Subframe size. */
#define M 10 /* Order of LP filter. */
#define MP1 (M+1) /* Order of LP filter + 1 */
#define PIT_MIN 20 /* Minimum pitch lag. */
#define PIT_MAX 143 /* Maximum pitch lag. */
#define L_INTERPOL (10+1) /* Length of filter for interpolation. */
#define GAMMA1 24576 /* Bandwitdh factor = 0.75 in Q15 */
#define PRM_SIZE 11 /* Size of vector of analysis parameters. */
#define SERIAL_SIZE (80+2) /* bfi+ number of speech bits */
#define SHARPMAX 13017 /* Maximum value of pitch sharpening 0.8 Q14 */
#define SHARPMIN 3277 /* Minimum value of pitch sharpening 0.2 Q14 */
/*-------------------------------*
* Mathematic functions. *
*-------------------------------*/
Word32 Inv_sqrt( /* (o) Q30 : output value (range: 0<=val<1) */
Word32 L_x /* (i) Q0 : input value (range: 0<=val<=7fffffff) */
);
void Log2(
Word32 L_x, /* (i) Q0 : input value */
Word16 *exponent, /* (o) Q0 : Integer part of Log2. (range: 0<=val<=30) */
Word16 *fraction /* (o) Q15: Fractionnal part of Log2. (range: 0<=val<1) */
);
Word32 Pow2( /* (o) Q0 : result (range: 0<=val<=0x7fffffff) */
Word16 exponent, /* (i) Q0 : Integer part. (range: 0<=val<=30) */
Word16 fraction /* (i) Q15 : Fractionnal part. (range: 0.0<=val<1.0) */
);
/*-------------------------------*
* Pre and post-process. *
*-------------------------------*/
void Init_Pre_Process(void);
void Init_Post_Process(void);
void Pre_Process(
Word16 signal[], /* Input/output signal */
Word16 lg /* Length of signal */
);
void Post_Process(
Word16 signal[], /* Input/output signal */
Word16 lg /* Length of signal */
);
/*----------------------------------*
* Main coder and decoder functions *
*----------------------------------*/
void Init_Coder_ld8a(void);
void Coder_ld8a(
Word16 ana[] /* output : Analysis parameters */
);
void Init_Decod_ld8a(void);
void Decod_ld8a(
Word16 parm[], /* (i) : vector of synthesis parameters
parm[0] = bad frame indicator (bfi) */
Word16 synth[], /* (o) : synthesis speech */
Word16 A_t[], /* (o) : decoded LP filter in 2 subframes */
Word16 *T2 /* (o) : decoded pitch lag in 2 subframes */
);
/*-------------------------------*
* LPC analysis and filtering. *
*-------------------------------*/
void Autocorr(
Word16 x[], /* (i) : Input signal */
Word16 m, /* (i) : LPC order */
Word16 r_h[], /* (o) : Autocorrelations (msb) */
Word16 r_l[] /* (o) : Autocorrelations (lsb) */
);
void Lag_window(
Word16 m, /* (i) : LPC order */
Word16 r_h[], /* (i/o) : Autocorrelations (msb) */
Word16 r_l[] /* (i/o) : Autocorrelations (lsb) */
);
void Levinson(
Word16 Rh[], /* (i) : Rh[m+1] Vector of autocorrelations (msb) */
Word16 Rl[], /* (i) : Rl[m+1] Vector of autocorrelations (lsb) */
Word16 A[], /* (o) Q12 : A[m] LPC coefficients (m = 10) */
Word16 rc[] /* (o) Q15 : rc[M] Relection coefficients. */
);
void Az_lsp(
Word16 a[], /* (i) Q12 : predictor coefficients */
Word16 lsp[], /* (o) Q15 : line spectral pairs */
Word16 old_lsp[] /* (i) : old lsp[] (in case not found 10 roots) */
);
void Lsp_Az(
Word16 lsp[], /* (i) Q15 : line spectral frequencies */
Word16 a[] /* (o) Q12 : predictor coefficients (order = 10) */
);
void Lsf_lsp(
Word16 lsf[], /* (i) Q15 : lsf[m] normalized (range: 0.0<=val<=0.5) */
Word16 lsp[], /* (o) Q15 : lsp[m] (range: -1<=val<1) */
Word16 m /* (i) : LPC order */
);
void Lsp_lsf(
Word16 lsp[], /* (i) Q15 : lsp[m] (range: -1<=val<1) */
Word16 lsf[], /* (o) Q15 : lsf[m] normalized (range: 0.0<=val<=0.5) */
Word16 m /* (i) : LPC order */
);
void Int_qlpc(
Word16 lsp_old[], /* input : LSP vector of past frame */
Word16 lsp_new[], /* input : LSP vector of present frame */
Word16 Az[] /* output: interpolated Az() for the 2 subframes */
);
void Weight_Az(
Word16 a[], /* (i) Q12 : a[m+1] LPC coefficients */
Word16 gamma, /* (i) Q15 : Spectral expansion factor. */
Word16 m, /* (i) : LPC order. */
Word16 ap[] /* (o) Q12 : Spectral expanded LPC coefficients */
);
void Residu(
Word16 a[], /* (i) Q12 : prediction coefficients */
Word16 x[], /* (i) : speech (values x[-m..-1] are needed (m=10) */
Word16 y[], /* (o) : residual signal */
Word16 lg /* (i) : size of filtering */
);
void Syn_filt(
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. */
);
void Convolve(
Word16 x[], /* (i) : input vector */
Word16 h[], /* (i) Q12 : impulse response */
Word16 y[], /* (o) : output vector */
Word16 L /* (i) : vector size */
);
/*--------------------------------------------------------------------------*
* LTP constant parameters *
*--------------------------------------------------------------------------*/
#define UP_SAMP 3
#define L_INTER10 10
#define FIR_SIZE_SYN (UP_SAMP*L_INTER10+1)
/*-----------------------*
* Pitch functions. *
*-----------------------*/
Word16 Pitch_ol_fast( /* output: open loop pitch lag */
Word16 signal[], /* input : signal used to compute the open loop pitch */
/* signal[-pit_max] to signal[-1] should be known */
Word16 pit_max, /* input : maximum pitch lag */
Word16 L_frame /* input : length of frame to compute pitch */
);
Word16 Pitch_fr3_fast(/* (o) : pitch period. */
Word16 exc[], /* (i) : excitation buffer */
Word16 xn[], /* (i) : target vector */
Word16 h[], /* (i) Q12 : impulse response of filters. */
Word16 L_subfr, /* (i) : Length of subframe */
Word16 t0_min, /* (i) : minimum value in the searched range. */
Word16 t0_max, /* (i) : maximum value in the searched range. */
Word16 i_subfr, /* (i) : indicator for first subframe. */
Word16 *pit_frac /* (o) : chosen fraction. */
);
Word16 G_pitch( /* (o) Q14 : Gain of pitch lag saturated to 1.2 */
Word16 xn[], /* (i) : Pitch target. */
Word16 y1[], /* (i) : Filtered adaptive codebook. */
Word16 g_coeff[], /* (i) : Correlations need for gain quantization. */
Word16 L_subfr /* (i) : Length of subframe. */
);
Word16 Enc_lag3( /* output: Return index of encoding */
Word16 T0, /* input : Pitch delay */
Word16 T0_frac, /* input : Fractional pitch delay */
Word16 *T0_min, /* in/out: Minimum search delay */
Word16 *T0_max, /* in/out: Maximum search delay */
Word16 pit_min, /* input : Minimum pitch delay */
Word16 pit_max, /* input : Maximum pitch delay */
Word16 pit_flag /* input : Flag for 1st subframe */
);
void Dec_lag3( /* output: return integer pitch lag */
Word16 index, /* input : received pitch index */
Word16 pit_min, /* input : minimum pitch lag */
Word16 pit_max, /* input : maximum pitch lag */
Word16 i_subfr, /* input : subframe flag */
Word16 *T0, /* output: integer part of pitch lag */
Word16 *T0_frac /* output: fractional part of pitch lag */
);
Word16 Interpol_3( /* (o) : interpolated value */
Word16 *x, /* (i) : input vector */
Word16 frac /* (i) : fraction */
);
void Pred_lt_3(
Word16 exc[], /* in/out: excitation buffer */
Word16 T0, /* input : integer pitch lag */
Word16 frac, /* input : fraction of lag */
Word16 L_subfr /* input : subframe size */
);
Word16 Parity_Pitch( /* output: parity bit (XOR of 6 MSB bits) */
Word16 pitch_index /* input : index for which parity to compute */
);
Word16 Check_Parity_Pitch( /* output: 0 = no error, 1= error */
Word16 pitch_index, /* input : index of parameter */
Word16 parity /* input : parity bit */
);
void Cor_h_X(
Word16 h[], /* (i) Q12 :Impulse response of filters */
Word16 X[], /* (i) :Target vector */
Word16 D[] /* (o) :Correlations between h[] and D[] */
/* Normalized to 13 bits */
);
/*-----------------------*
* Innovative codebook. *
*-----------------------*/
#define DIM_RR 616 /* size of correlation matrix */
#define NB_POS 8 /* Number of positions for each pulse */
#define STEP 5 /* Step betweem position of the same pulse. */
#define MSIZE 64 /* Size of vectors for cross-correlation between 2 pulses*/
/* The following constants are Q15 fractions.
These fractions is used to keep maximum precision on "alp" sum */
#define _1_2 (Word16)(16384)
#define _1_4 (Word16)( 8192)
#define _1_8 (Word16)( 4096)
#define _1_16 (Word16)( 2048)
Word16 ACELP_Code_A( /* (o) :index of pulses positions */
Word16 x[], /* (i) :Target vector */
Word16 h[], /* (i) Q12 :Inpulse response of filters */
Word16 T0, /* (i) :Pitch lag */
Word16 pitch_sharp, /* (i) Q14 :Last quantized pitch gain */
Word16 code[], /* (o) Q13 :Innovative codebook */
Word16 y[], /* (o) Q12 :Filtered innovative codebook */
Word16 *sign /* (o) :Signs of 4 pulses */
);
void Decod_ACELP(
Word16 sign, /* (i) : signs of 4 pulses. */
Word16 index, /* (i) : Positions of the 4 pulses. */
Word16 cod[] /* (o) Q13 : algebraic (fixed) codebook excitation */
);
/*--------------------------------------------------------------------------*
* LSP constant parameters *
*--------------------------------------------------------------------------*/
#define NC 5 /* NC = M/2 */
#define MA_NP 4 /* MA prediction order for LSP */
#define MODE 2 /* number of modes for MA prediction */
#define NC0_B 7 /* number of first stage bits */
#define NC1_B 5 /* number of second stage bits */
#define NC0 (1<<NC0_B)
#define NC1 (1<<NC1_B)
#define L_LIMIT 40 /* Q13:0.005 */
#define M_LIMIT 25681 /* Q13:3.135 */
#define GAP1 10 /* Q13 */
#define GAP2 5 /* Q13 */
#define GAP3 321 /* Q13 */
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