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ref: f9b1b3fec85aab07db668b697fa700a94d7f75aa
dir: /silk/float/silk_SigProc_FLP.h/

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#ifndef _SILK_SIGPROC_FLP_H_
#define _SILK_SIGPROC_FLP_H_

#include "silk_SigProc_FIX.h"
#include <math.h>

#ifdef  __cplusplus
extern "C"
{
#endif

/********************************************************************/
/*                    SIGNAL PROCESSING FUNCTIONS                   */
/********************************************************************/

/* Chirp (bw expand) LP AR filter */
void silk_bwexpander_FLP(
    SKP_float *ar,                     /* io   AR filter to be expanded (without leading 1)    */
    const opus_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 silk_FLP_a2k()                                    */
opus_int 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]           */
    opus_int32            order          /* I:   prediction order                          */
);

SKP_float 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)   */
    opus_int         order               /* I    order                                       */
);

void silk_k2a_FLP(
    SKP_float           *A,             /* O:    prediction coefficients [order]           */
    const SKP_float     *rc,            /* I:    reflection coefficients [order]           */
    opus_int32           order           /* I:    prediction order                          */
);

/* Solve the normal equations using the Levinson-Durbin recursion */
SKP_float 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 opus_int    order                /* I    prediction order                             */
);

/* compute autocorrelation */
void silk_autocorrelation_FLP(
    SKP_float *results,                 /* o    result (length correlationCount)            */
    const SKP_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 SKP_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                                            */
    SKP_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 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 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(
    SKP_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 */
SKP_float 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 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 SKP_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(
    SKP_float           *data1,
    SKP_float           gain,
    opus_int             dataSize
);

/* copy and multiply a vector by a constant */
void silk_scale_copy_vector_FLP(
    SKP_float           *data_out,
    const SKP_float     *data_in,
    SKP_float           gain,
    opus_int             dataSize
);

/* inner product of two SKP_float arrays, with result as double */
double silk_inner_product_FLP(
    const SKP_float     *data1,
    const SKP_float     *data2,
    opus_int             dataSize
);

/* sum of squares of a SKP_float array, with result as double */
double silk_energy_FLP(
    const SKP_float     *data,
    opus_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) */
SKP_INLINE opus_int32 SKP_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) */
SKP_INLINE void SKP_float2short_array(
    opus_int16       *out,
    const SKP_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)SKP_SAT16(*(( opus_int32 * )( &t )));
#else
        double x = in[k];
        out[k] = (opus_int16)SKP_SAT16( ( x > 0 ) ? x + 0.5 : x - 0.5 );
#endif
    }
}

/* integer to floating-point conversion */
SKP_INLINE void SKP_short2float_array(
    SKP_float       *out,
    const opus_int16 *in,
    opus_int32       length
)
{
    opus_int32 k;
    for (k = length-1; k >= 0; k--) {
        out[k] = (SKP_float)in[k];
    }
}

/* using log2() helps the fixed-point conversion */
SKP_INLINE SKP_float silk_log2( double x ) { return ( SKP_float )( 3.32192809488736 * log10( x ) ); }

#ifdef  __cplusplus
}
#endif

#endif