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***********************************************************************/ | |
#ifndef _SKP_SILK_SIGPROC_FLP_H_ | |
#define _SKP_SILK_SIGPROC_FLP_H_ | |
#include "SKP_Silk_SigProc_FIX.h" | |
#include "float_cast.h" | |
#include <math.h> | |
#ifdef __cplusplus | |
extern "C" | |
{ | |
#endif | |
/********************************************************************/ | |
/* SIGNAL PROCESSING FUNCTIONS */ | |
/********************************************************************/ | |
/* Chirp (bw expand) LP AR filter */ | |
void SKP_Silk_bwexpander_FLP( | |
SKP_float *ar, /* io AR filter to be expanded (without leading 1) */ | |
const SKP_int d, /* i length of ar */ | |
const SKP_float chirp /* i chirp factor (typically in range (0..1) ) */ | |
); | |
/* compute inverse of LPC prediction gain, and */ | |
/* test if LPC coefficients are stable (all poles within unit circle) */ | |
/* this code is based on SKP_Silk_FLP_a2k() */ | |
SKP_int SKP_Silk_LPC_inverse_pred_gain_FLP( /* O: returns 1 if unstable, otherwise 0 */ | |
SKP_float *invGain, /* O: inverse prediction gain, energy domain */ | |
const SKP_float *A, /* I: prediction coefficients [order] */ | |
SKP_int32 order /* I: prediction order */ | |
); | |
SKP_float SKP_Silk_schur_FLP( /* O returns residual energy */ | |
SKP_float refl_coef[], /* O reflection coefficients (length order) */ | |
const SKP_float auto_corr[], /* I autocorrelation sequence (length order+1) */ | |
SKP_int order /* I order */ | |
); | |
void SKP_Silk_k2a_FLP( | |
SKP_float *A, /* O: prediction coefficients [order] */ | |
const SKP_float *rc, /* I: reflection coefficients [order] */ | |
SKP_int32 order /* I: prediction order */ | |
); | |
/* Solve the normal equations using the Levinson-Durbin recursion */ | |
SKP_float SKP_Silk_levinsondurbin_FLP( /* O prediction error energy */ | |
SKP_float A[], /* O prediction coefficients [order] */ | |
const SKP_float corr[], /* I input auto-correlations [order + 1] */ | |
const SKP_int order /* I prediction order */ | |
); | |
/* compute autocorrelation */ | |
void SKP_Silk_autocorrelation_FLP( | |
SKP_float *results, /* o result (length correlationCount) */ | |
const SKP_float *inputData, /* i input data to correlate */ | |
SKP_int inputDataSize, /* i length of input */ | |
SKP_int correlationCount /* i number of correlation taps to compute */ | |
); | |
/* Pitch estimator */ | |
#define SigProc_PE_MIN_COMPLEX 0 | |
#define SigProc_PE_MID_COMPLEX 1 | |
#define SigProc_PE_MAX_COMPLEX 2 | |
SKP_int SKP_Silk_pitch_analysis_core_FLP( /* O voicing estimate: 0 voiced, 1 unvoiced */ | |
const SKP_float *signal, /* I signal of length PE_FRAME_LENGTH_MS*Fs_kHz */ | |
SKP_int *pitch_out, /* O 4 pitch lag values */ | |
SKP_int16 *lagIndex, /* O lag Index */ | |
SKP_int8 *contourIndex, /* O pitch contour Index */ | |
SKP_float *LTPCorr, /* I/O normalized correlation; input: value from previous frame */ | |
SKP_int prevLag, /* I last lag of previous frame; set to zero is unvoiced */ | |
const SKP_float search_thres1, /* I first stage threshold for lag candidates 0 - 1 */ | |
const SKP_float search_thres2, /* I final threshold for lag candidates 0 - 1 */ | |
const SKP_int Fs_kHz, /* I sample frequency (kHz) */ | |
const SKP_int complexity, /* I Complexity setting, 0-2, where 2 is highest */ | |
const SKP_int nb_subfr /* I number of 5 ms subframes */ | |
); | |
#define PI (3.1415926536f) | |
void SKP_Silk_insertion_sort_decreasing_FLP( | |
SKP_float *a, /* I/O: Unsorted / Sorted vector */ | |
SKP_int *index, /* O: Index vector for the sorted elements */ | |
const SKP_int L, /* I: Vector length */ | |
const SKP_int K /* I: Number of correctly sorted positions */ | |
); | |
/* Compute reflection coefficients from input signal */ | |
SKP_float SKP_Silk_burg_modified_FLP( /* O returns residual energy */ | |
SKP_float A[], /* O prediction coefficients (length order) */ | |
const SKP_float x[], /* I input signal, length: nb_subfr*(D+L_sub) */ | |
const SKP_int subfr_length, /* I input signal subframe length (including D preceeding samples) */ | |
const SKP_int nb_subfr, /* I number of subframes stacked in x */ | |
const SKP_float WhiteNoiseFrac, /* I fraction added to zero-lag autocorrelation */ | |
const SKP_int D /* I order */ | |
); | |
/* multiply a vector by a constant */ | |
void SKP_Silk_scale_vector_FLP( | |
SKP_float *data1, | |
SKP_float gain, | |
SKP_int dataSize | |
); | |
/* copy and multiply a vector by a constant */ | |
void SKP_Silk_scale_copy_vector_FLP( | |
SKP_float *data_out, | |
const SKP_float *data_in, | |
SKP_float gain, | |
SKP_int dataSize | |
); | |
/* inner product of two SKP_float arrays, with result as double */ | |
double SKP_Silk_inner_product_FLP( | |
const SKP_float *data1, | |
const SKP_float *data2, | |
SKP_int dataSize | |
); | |
/* sum of squares of a SKP_float array, with result as double */ | |
double SKP_Silk_energy_FLP( | |
const SKP_float *data, | |
SKP_int dataSize | |
); | |
/********************************************************************/ | |
/* MACROS */ | |
/********************************************************************/ | |
#define SKP_min_float(a, b) (((a) < (b)) ? (a) : (b)) | |
#define SKP_max_float(a, b) (((a) > (b)) ? (a) : (b)) | |
#define SKP_abs_float(a) ((SKP_float)fabs(a)) | |
#define SKP_LIMIT_float( a, limit1, limit2) ((limit1) > (limit2) ? ((a) > (limit1) ? (limit1) : ((a) < (limit2) ? (limit2) : (a))) \ | |
: ((a) > (limit2) ? (limit2) : ((a) < (limit1) ? (limit1) : (a)))) | |
/* sigmoid function */ | |
SKP_INLINE SKP_float SKP_sigmoid(SKP_float x) | |
{ | |
return (SKP_float)(1.0 / (1.0 + exp(-x))); | |
} | |
/* floating-point to integer conversion (rounding) */ | |
#if 1 | |
/* use implementation in float_cast.h */ | |
#define SKP_float2int(x) float2int(x) | |
#else | |
SKP_INLINE SKP_int32 SKP_float2int(SKP_float x) | |
{ | |
double y = x; | |
return (SKP_int32)( ( y > 0 ) ? y + 0.5 : y - 0.5 ); | |
} | |
#endif | |
/* floating-point to integer conversion (rounding) */ | |
SKP_INLINE void SKP_float2short_array( | |
SKP_int16 *out, | |
const SKP_float *in, | |
SKP_int32 length | |
) | |
{ | |
SKP_int32 k; | |
for (k = length-1; k >= 0; k--) { | |
out[k] = (SKP_int16)SKP_SAT16( float2int( in[k] ) ); | |
} | |
} | |
/* integer to floating-point conversion */ | |
SKP_INLINE void SKP_short2float_array( | |
SKP_float *out, | |
const SKP_int16 *in, | |
SKP_int32 length | |
) | |
{ | |
SKP_int32 k; | |
for (k = length-1; k >= 0; k--) { | |
out[k] = (SKP_float)in[k]; | |
} | |
} | |
#define SKP_round(x) (SKP_float)((x)>=0 ? (SKP_int64)((x)+0.5) : (SKP_int64)((x)-0.5)) | |
#ifdef __cplusplus | |
} | |
#endif | |
#endif |