?? ld8k.h
字號(hào):
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 THRESHPIT 27853 /* Threshold to favor small pitch 0.85 Q15 */
#define UP_SAMP 3 /* upsampling factor for fractional pitch */
#define L_INTER4 4 /* length/2 for interpolation filter */
#define FIR_SIZE_ANA (UP_SAMP*L_INTER4+1)
#define L_INTER10 10 /* length/2 for interpolation filter */
#define FIR_SIZE_SYN (UP_SAMP*L_INTER10+1)
/*--------------------------------------------------------------------------*
* Pitch functions. *
*--------------------------------------------------------------------------*/
Word16 Pitch_ol( /* (o) : open loop pitch lag */
Word16 signal[], /* (i) : signal used to compute the open loop pitch */
/* signal[-pit_max] to signal[-1] should be known */
Word16 pit_min, /* (i) : minimum pitch lag */
Word16 pit_max, /* (i) : maximum pitch lag */
Word16 L_frame /* (i) : length of frame to compute pitch */
);
Word16 Pitch_fr3( /* (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( /* (o) : Return index of encoding */
Word16 T0, /* (i) : Pitch delay */
Word16 T0_frac, /* (i) : Fractional pitch delay */
Word16 *T0_min, /* (i/o) : Minimum search delay */
Word16 *T0_max, /* (i/o) : Maximum search delay */
Word16 pit_min, /* (i) : Minimum pitch delay */
Word16 pit_max, /* (i) : Maximum pitch delay */
Word16 pit_flag /* (i) : Flag for 1st subframe */
);
void Dec_lag3( /* (o) : return integer pitch lag */
Word16 index, /* (i) : received pitch index */
Word16 pit_min, /* (i) : minimum pitch lag */
Word16 pit_max, /* (i) : maximum pitch lag */
Word16 i_subfr, /* (i) : subframe flag */
Word16 *T0, /* (o) : integer part of pitch lag */
Word16 *T0_frac /* (o) : 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[], /* (i/o) : excitation buffer */
Word16 T0, /* (i) : integer pitch lag */
Word16 frac, /* (i) : fraction of lag */
Word16 L_subfr /* (i) : subframe size */
);
Word16 Parity_Pitch( /* (o) : parity bit (XOR of 6 MSB bits) */
Word16 pitch_index /* (i) : index for which parity to compute */
);
Word16 Check_Parity_Pitch( /* (o) : 0 = no error, 1= error */
Word16 pitch_index, /* (i) : index of parameter */
Word16 parity /* (i) : parity bit */
);
/*--------------------------------------------------------------------------*
* fixed codebook excitation. *
*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*
* FCB constant parameters *
*--------------------------------------------------------------------------*/
#define DIM_RR 616 /* size of correlation matrix */
#define NB_POS 8 /* */
#define STEP 5 /* spacing for individual pulse */
#define MSIZE 64
#define THRESHFCB 13107 /* 0.4 in Q15 */
#define MAX_TIME 75 /* maximum number of iterations */
/*--------------------------------------------------------------------------*
* FCB functions. *
*--------------------------------------------------------------------------*/
Word16 ACELP_Codebook( /* (o) : index of pulses positions */
Word16 x[], /* (i) : Target vector */
Word16 h[], /* (i) Q12 : Impulse response of filters */
Word16 T0, /* (i) : Pitch lag */
Word16 pitch_sharp,/* (i) Q14: Last quantized pitch gain */
Word16 i_subfr, /* (i) : Indicator of 1st subframe, */
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 quantizer 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) /* number of entries in first stage */
#define NC1 (1<<NC1_B) /* number of entries in second stage */
#define L_LIMIT 40 /* minimum lsf value Q13:0.005 */
#define M_LIMIT 25681 /* maximum lsf value Q13:3.135 */
#define GAP1 10 /* bandwidth expansion factor Q13 */
#define GAP2 5 /* bandwidth expansion factor Q13 */
#define GAP3 321 /* bandwidth expansion factor Q13 */
#define GRID_POINTS 60 /* search grid */
#define PI04 ((Word16)1029) /* Q13 pi*0.04 */
#define PI92 ((Word16)23677) /* Q13 pi*0.92 */
#define CONST10 ((Word16)10*(1<<11)) /* Q11 10.0 */
#define CONST12 ((Word16)19661) /* Q14 1.2 */
/*--------------------------------------------------------------------------*
* LSP VQ functions. *
*--------------------------------------------------------------------------*/
void Lsf_lsp2(
Word16 lsf[], /* (i) Q13 : lsf[m] (range: 0.0<=val<PI) */
Word16 lsp[], /* (o) Q15 : lsp[m] (range: -1<=val<1) */
Word16 m /* (i) : LPC order */
);
void Lsp_lsf2(
Word16 lsp[], /* (i) Q15 : lsp[m] (range: -1<=val<1) */
Word16 lsf[], /* (o) Q13 : lsf[m] (range: 0.0<=val<PI) */
Word16 m /* (i) : LPC order */
);
void Qua_lsp(
Word16 lsp[], /* (i) Q15 : Unquantized LSP */
Word16 lsp_q[], /* (o) Q15 : Quantized LSP */
Word16 ana[] /* (o) : indexes */
);
void Get_wegt(
Word16 flsp[], /* (i) Q13 : */
Word16 wegt[] /* (o) Q11 : normalized */
);
void Lsp_encw_reset( void);
void Lsp_qua_cs(
Word16 flsp_in[M], /* Q13 */
Word16 lspq_out[M], /* Q13 */
Word16 *code
);
void Lsp_expand_1(
Word16 buf[], /* Q13 */
Word16 gap /* Q13 */
);
void Lsp_expand_2(
Word16 buf[], /* Q13 */
Word16 gap /* Q13 */
);
void Lsp_expand_1_2(
Word16 buf[], /* Q13 */
Word16 gap /* Q13 */
);
void Lsp_get_quant(
Word16 lspcb1[][M], /* Q13 */
Word16 lspcb2[][M], /* Q13 */
Word16 code0,
Word16 code1,
Word16 code2,
Word16 fg[][M], /* Q15 */
Word16 freq_prev[][M], /* Q13 */
Word16 lspq[], /* Q13 */
Word16 fg_sum[] /* Q15 */
);
void Lsp_get_tdist(
Word16 wegt[], /* normalized */
Word16 buf[], /* Q13 */
Word32 *L_tdist, /* Q27 */
Word16 rbuf[], /* Q13 */
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