ref: d84fa9fd6eb96202f5721ae3ce6410d1cbb19f96
dir: /silk/float/SigProc_FLP.h/
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#ifndef _SILK_SIGPROC_FLP_H_
#define _SILK_SIGPROC_FLP_H_
#include "SigProc_FIX.h"
#include <math.h>
#ifdef __cplusplus
extern "C"
{
#endif
/********************************************************************/
/* SIGNAL PROCESSING FUNCTIONS */
/********************************************************************/
/* Chirp (bw expand) LP AR filter */
void silk_bwexpander_FLP(
silk_float *ar, /* io AR filter to be expanded (without leading 1) */
const opus_int d, /* i length of ar */
const silk_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 silk_FLP_a2k() */
opus_int silk_LPC_inverse_pred_gain_FLP( /* O: returns 1 if unstable, otherwise 0 */
silk_float *invGain, /* O: inverse prediction gain, energy domain */
const silk_float *A, /* I: prediction coefficients [order] */
opus_int32 order /* I: prediction order */
);
silk_float silk_schur_FLP( /* O returns residual energy */
silk_float refl_coef[], /* O reflection coefficients (length order) */
const silk_float auto_corr[], /* I autocorrelation sequence (length order+1) */
opus_int order /* I order */
);
void silk_k2a_FLP(
silk_float *A, /* O: prediction coefficients [order] */
const silk_float *rc, /* I: reflection coefficients [order] */
opus_int32 order /* I: prediction order */
);
/* Solve the normal equations using the Levinson-Durbin recursion */
silk_float silk_levinsondurbin_FLP( /* O prediction error energy */
silk_float A[], /* O prediction coefficients [order] */
const silk_float corr[], /* I input auto-correlations [order + 1] */
const opus_int order /* I prediction order */
);
/* compute autocorrelation */
void silk_autocorrelation_FLP(
silk_float *results, /* o result (length correlationCount) */
const silk_float *inputData, /* i input data to correlate */
opus_int inputDataSize, /* i length of input */
opus_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
opus_int silk_pitch_analysis_core_FLP( /* O voicing estimate: 0 voiced, 1 unvoiced */
const silk_float *signal, /* I signal of length PE_FRAME_LENGTH_MS*Fs_kHz */
opus_int *pitch_out, /* O 4 pitch lag values */
opus_int16 *lagIndex, /* O lag Index */
opus_int8 *contourIndex, /* O pitch contour Index */
silk_float *LTPCorr, /* I/O normalized correlation; input: value from previous frame */
opus_int prevLag, /* I last lag of previous frame; set to zero is unvoiced */
const silk_float search_thres1, /* I first stage threshold for lag candidates 0 - 1 */
const silk_float search_thres2, /* I final threshold for lag candidates 0 - 1 */
const opus_int Fs_kHz, /* I sample frequency (kHz) */
const opus_int complexity, /* I Complexity setting, 0-2, where 2 is highest */
const opus_int nb_subfr /* I number of 5 ms subframes */
);
#define PI (3.1415926536f)
void silk_insertion_sort_decreasing_FLP(
silk_float *a, /* I/O: Unsorted / Sorted vector */
opus_int *idx, /* O: Index vector for the sorted elements */
const opus_int L, /* I: Vector length */
const opus_int K /* I: Number of correctly sorted positions */
);
/* Compute reflection coefficients from input signal */
silk_float silk_burg_modified_FLP( /* O returns residual energy */
silk_float A[], /* O prediction coefficients (length order) */
const silk_float x[], /* I input signal, length: nb_subfr*(D+L_sub) */
const opus_int subfr_length, /* I input signal subframe length (including D preceeding samples) */
const opus_int nb_subfr, /* I number of subframes stacked in x */
const silk_float WhiteNoiseFrac, /* I fraction added to zero-lag autocorrelation */
const opus_int D /* I order */
);
/* multiply a vector by a constant */
void silk_scale_vector_FLP(
silk_float *data1,
silk_float gain,
opus_int dataSize
);
/* copy and multiply a vector by a constant */
void silk_scale_copy_vector_FLP(
silk_float *data_out,
const silk_float *data_in,
silk_float gain,
opus_int dataSize
);
/* inner product of two silk_float arrays, with result as double */
double silk_inner_product_FLP(
const silk_float *data1,
const silk_float *data2,
opus_int dataSize
);
/* sum of squares of a silk_float array, with result as double */
double silk_energy_FLP(
const silk_float *data,
opus_int dataSize
);
/********************************************************************/
/* MACROS */
/********************************************************************/
#define silk_min_float(a, b) (((a) < (b)) ? (a) : (b))
#define silk_max_float(a, b) (((a) > (b)) ? (a) : (b))
#define silk_abs_float(a) ((silk_float)fabs(a))
#define silk_LIMIT_float( a, limit1, limit2) ((limit1) > (limit2) ? ((a) > (limit1) ? (limit1) : ((a) < (limit2) ? (limit2) : (a))) \
: ((a) > (limit2) ? (limit2) : ((a) < (limit1) ? (limit1) : (a))))
/* sigmoid function */
static inline silk_float silk_sigmoid(silk_float x)
{
return (silk_float)(1.0 / (1.0 + exp(-x)));
}
/* floating-point to integer conversion (rounding) */
static inline opus_int32 silk_float2int(double x)
{
#ifdef _WIN32
double t = x + 6755399441055744.0;
return *((opus_int32 *)( &t ));
#else
return (opus_int32)( ( x > 0 ) ? x + 0.5 : x - 0.5 );
#endif
}
/* floating-point to integer conversion (rounding) */
static inline void silk_float2short_array(
opus_int16 *out,
const silk_float *in,
opus_int32 length
)
{
opus_int32 k;
for (k = length-1; k >= 0; k--) {
#ifdef _WIN32
double t = in[k] + 6755399441055744.0;
out[k] = (opus_int16)silk_SAT16(*(( opus_int32 * )( &t )));
#else
double x = in[k];
out[k] = (opus_int16)silk_SAT16( ( x > 0 ) ? x + 0.5 : x - 0.5 );
#endif
}
}
/* integer to floating-point conversion */
static inline void silk_short2float_array(
silk_float *out,
const opus_int16 *in,
opus_int32 length
)
{
opus_int32 k;
for (k = length-1; k >= 0; k--) {
out[k] = (silk_float)in[k];
}
}
/* using log2() helps the fixed-point conversion */
static inline silk_float silk_log2( double x ) { return ( silk_float )( 3.32192809488736 * log10( x ) ); }
#ifdef __cplusplus
}
#endif
#endif