1885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/*********************************************************************** 2885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgCopyright (c) 2006-2011, Skype Limited. All rights reserved. 3885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgRedistribution and use in source and binary forms, with or without 4885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgmodification, are permitted provided that the following conditions 5885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgare met: 6885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org- Redistributions of source code must retain the above copyright notice, 7885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgthis list of conditions and the following disclaimer. 8885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org- Redistributions in binary form must reproduce the above copyright 9885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgnotice, this list of conditions and the following disclaimer in the 10885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgdocumentation and/or other materials provided with the distribution. 11e3ea049fcaee2247e45f0ce793d4313babb4ef69tlegrand@chromium.org- Neither the name of Internet Society, IETF or IETF Trust, nor the 12885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgnames of specific contributors, may be used to endorse or promote 13885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgproducts derived from this software without specific prior written 14885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgpermission. 15e3ea049fcaee2247e45f0ce793d4313babb4ef69tlegrand@chromium.orgTHIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 16885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgAND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgIMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 19885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgLIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgCONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgSUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgINTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgCONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgPOSSIBILITY OF SUCH DAMAGE. 26885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org***********************************************************************/ 27885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 28885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#ifndef SILK_SIGPROC_FLP_H 29885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#define SILK_SIGPROC_FLP_H 30885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 31885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#include "SigProc_FIX.h" 32885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#include "float_cast.h" 33885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#include <math.h> 34885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 35885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#ifdef __cplusplus 36885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgextern "C" 37885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org{ 38885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#endif 39885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 40885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/********************************************************************/ 41885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* SIGNAL PROCESSING FUNCTIONS */ 42885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/********************************************************************/ 43885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 44885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* Chirp (bw expand) LP AR filter */ 45885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgvoid silk_bwexpander_FLP( 46885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_float *ar, /* I/O AR filter to be expanded (without leading 1) */ 47885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const opus_int d, /* I length of ar */ 48885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const silk_float chirp /* I chirp factor (typically in range (0..1) ) */ 49885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org); 50885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 51885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* compute inverse of LPC prediction gain, and */ 52885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* test if LPC coefficients are stable (all poles within unit circle) */ 53885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* this code is based on silk_FLP_a2k() */ 54885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgsilk_float silk_LPC_inverse_pred_gain_FLP( /* O return inverse prediction gain, energy domain */ 55885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const silk_float *A, /* I prediction coefficients [order] */ 56885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int32 order /* I prediction order */ 57885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org); 58885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 59885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgsilk_float silk_schur_FLP( /* O returns residual energy */ 60885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_float refl_coef[], /* O reflection coefficients (length order) */ 61885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const silk_float auto_corr[], /* I autocorrelation sequence (length order+1) */ 62885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int order /* I order */ 63885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org); 64885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 65885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgvoid silk_k2a_FLP( 66885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_float *A, /* O prediction coefficients [order] */ 67885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const silk_float *rc, /* I reflection coefficients [order] */ 68885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int32 order /* I prediction order */ 69885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org); 70885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 71885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* Solve the normal equations using the Levinson-Durbin recursion */ 72885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgsilk_float silk_levinsondurbin_FLP( /* O prediction error energy */ 73885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_float A[], /* O prediction coefficients [order] */ 74885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const silk_float corr[], /* I input auto-correlations [order + 1] */ 75885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const opus_int order /* I prediction order */ 76885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org); 77885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 78885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* compute autocorrelation */ 79885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgvoid silk_autocorrelation_FLP( 80885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_float *results, /* O result (length correlationCount) */ 81885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const silk_float *inputData, /* I input data to correlate */ 82885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int inputDataSize, /* I length of input */ 83885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int correlationCount /* I number of correlation taps to compute */ 84885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org); 85885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 86885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgopus_int silk_pitch_analysis_core_FLP( /* O Voicing estimate: 0 voiced, 1 unvoiced */ 87885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const silk_float *frame, /* I Signal of length PE_FRAME_LENGTH_MS*Fs_kHz */ 88885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int *pitch_out, /* O Pitch lag values [nb_subfr] */ 89885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int16 *lagIndex, /* O Lag Index */ 90885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int8 *contourIndex, /* O Pitch contour Index */ 91885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_float *LTPCorr, /* I/O Normalized correlation; input: value from previous frame */ 92885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int prevLag, /* I Last lag of previous frame; set to zero is unvoiced */ 93885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const silk_float search_thres1, /* I First stage threshold for lag candidates 0 - 1 */ 94885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const silk_float search_thres2, /* I Final threshold for lag candidates 0 - 1 */ 95885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const opus_int Fs_kHz, /* I sample frequency (kHz) */ 96885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const opus_int complexity, /* I Complexity setting, 0-2, where 2 is highest */ 973c3902f0ac13428394f14f78f0fab05ef3468d69tlegrand@google.com const opus_int nb_subfr, /* I Number of 5 ms subframes */ 983c3902f0ac13428394f14f78f0fab05ef3468d69tlegrand@google.com int arch /* I Run-time architecture */ 99885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org); 100885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 101885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgvoid silk_insertion_sort_decreasing_FLP( 102885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_float *a, /* I/O Unsorted / Sorted vector */ 103885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int *idx, /* O Index vector for the sorted elements */ 104885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const opus_int L, /* I Vector length */ 105885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const opus_int K /* I Number of correctly sorted positions */ 106885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org); 107885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 108885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* Compute reflection coefficients from input signal */ 109885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgsilk_float silk_burg_modified_FLP( /* O returns residual energy */ 110885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_float A[], /* O prediction coefficients (length order) */ 111885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const silk_float x[], /* I input signal, length: nb_subfr*(D+L_sub) */ 112885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const silk_float minInvGain, /* I minimum inverse prediction gain */ 1136b6bee25314cfac02cc555cddedb9680c63a26d6sergeyu@chromium.org const opus_int subfr_length, /* I input signal subframe length (incl. D preceding samples) */ 114885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const opus_int nb_subfr, /* I number of subframes stacked in x */ 115885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const opus_int D /* I order */ 116885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org); 117885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 118885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* multiply a vector by a constant */ 119885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgvoid silk_scale_vector_FLP( 120885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_float *data1, 121885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_float gain, 122885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int dataSize 123885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org); 124885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 125885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* copy and multiply a vector by a constant */ 126885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgvoid silk_scale_copy_vector_FLP( 127885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_float *data_out, 128885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const silk_float *data_in, 129885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_float gain, 130885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int dataSize 131885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org); 132885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 133885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* inner product of two silk_float arrays, with result as double */ 134885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgdouble silk_inner_product_FLP( 135885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const silk_float *data1, 136885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const silk_float *data2, 137885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int dataSize 138885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org); 139885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 140885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* sum of squares of a silk_float array, with result as double */ 141885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgdouble silk_energy_FLP( 142885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const silk_float *data, 143885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int dataSize 144885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org); 145885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 146885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/********************************************************************/ 147885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* MACROS */ 148885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/********************************************************************/ 149885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 150885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#define PI (3.1415926536f) 151885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 152885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#define silk_min_float( a, b ) (((a) < (b)) ? (a) : (b)) 153885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#define silk_max_float( a, b ) (((a) > (b)) ? (a) : (b)) 154885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#define silk_abs_float( a ) ((silk_float)fabs(a)) 155885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 156885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* sigmoid function */ 1573c3902f0ac13428394f14f78f0fab05ef3468d69tlegrand@google.comstatic OPUS_INLINE silk_float silk_sigmoid( silk_float x ) 158885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org{ 159885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org return (silk_float)(1.0 / (1.0 + exp(-x))); 160885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org} 161885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 162885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* floating-point to integer conversion (rounding) */ 1633c3902f0ac13428394f14f78f0fab05ef3468d69tlegrand@google.comstatic OPUS_INLINE opus_int32 silk_float2int( silk_float x ) 164885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org{ 165885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org return (opus_int32)float2int( x ); 166885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org} 167885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 168885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* floating-point to integer conversion (rounding) */ 1693c3902f0ac13428394f14f78f0fab05ef3468d69tlegrand@google.comstatic OPUS_INLINE void silk_float2short_array( 170885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int16 *out, 171885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const silk_float *in, 172885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int32 length 173885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org) 174885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org{ 175885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int32 k; 176885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org for( k = length - 1; k >= 0; k-- ) { 177885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org out[k] = silk_SAT16( (opus_int32)float2int( in[k] ) ); 178885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } 179885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org} 180885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 181885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* integer to floating-point conversion */ 1823c3902f0ac13428394f14f78f0fab05ef3468d69tlegrand@google.comstatic OPUS_INLINE void silk_short2float_array( 183885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_float *out, 184885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const opus_int16 *in, 185885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int32 length 186885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org) 187885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org{ 188885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int32 k; 189885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org for( k = length - 1; k >= 0; k-- ) { 190885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org out[k] = (silk_float)in[k]; 191885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } 192885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org} 193885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 194885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* using log2() helps the fixed-point conversion */ 1953c3902f0ac13428394f14f78f0fab05ef3468d69tlegrand@google.comstatic OPUS_INLINE silk_float silk_log2( double x ) 196885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org{ 197885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org return ( silk_float )( 3.32192809488736 * log10( x ) ); 198885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org} 199885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 200885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#ifdef __cplusplus 201885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org} 202885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#endif 203885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 204885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#endif /* SILK_SIGPROC_FLP_H */ 205