16f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org/*********************************************************************** 26f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.orgCopyright (c) 2006-2011, Skype Limited. All rights reserved. 36f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.orgRedistribution and use in source and binary forms, with or without 46f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.orgmodification, are permitted provided that the following conditions 56f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.orgare met: 66f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org- Redistributions of source code must retain the above copyright notice, 76f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.orgthis list of conditions and the following disclaimer. 86f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org- Redistributions in binary form must reproduce the above copyright 96f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.orgnotice, this list of conditions and the following disclaimer in the 106f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.orgdocumentation and/or other materials provided with the distribution. 116f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org- Neither the name of Internet Society, IETF or IETF Trust, nor the 126f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.orgnames of specific contributors, may be used to endorse or promote 136f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.orgproducts derived from this software without specific prior written 146f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.orgpermission. 156f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.orgTHIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 166f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.orgAND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 176f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.orgIMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 186f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.orgARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 196f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.orgLIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 206f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.orgCONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 216f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.orgSUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 226f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.orgINTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 236f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.orgCONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 246f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.orgARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 256f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.orgPOSSIBILITY OF SUCH DAMAGE. 266f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org***********************************************************************/ 276f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org 286f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org#ifdef HAVE_CONFIG_H 296f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org#include "config.h" 306f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org#endif 316f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org 326f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org#include <stdlib.h> 336f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org#include "main_FLP.h" 346f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org#include "tuning_parameters.h" 356f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org 366f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.orgvoid silk_find_pitch_lags_FLP( 376f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ 386f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */ 396f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org silk_float res[], /* O Residual */ 406f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org const silk_float x[], /* I Speech signal */ 416f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org int arch /* I Run-time architecture */ 426f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org) 436f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org{ 446f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org opus_int buf_len; 456f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org silk_float thrhld, res_nrg; 466f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org const silk_float *x_buf_ptr, *x_buf; 476f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org silk_float auto_corr[ MAX_FIND_PITCH_LPC_ORDER + 1 ]; 486f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org silk_float A[ MAX_FIND_PITCH_LPC_ORDER ]; 496f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org silk_float refl_coef[ MAX_FIND_PITCH_LPC_ORDER ]; 506f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org silk_float Wsig[ FIND_PITCH_LPC_WIN_MAX ]; 516f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org silk_float *Wsig_ptr; 526f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org 536f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org /******************************************/ 546f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org /* Set up buffer lengths etc based on Fs */ 556f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org /******************************************/ 566f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org buf_len = psEnc->sCmn.la_pitch + psEnc->sCmn.frame_length + psEnc->sCmn.ltp_mem_length; 576f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org 586f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org /* Safety check */ 596f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org silk_assert( buf_len >= psEnc->sCmn.pitch_LPC_win_length ); 606f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org 616f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org x_buf = x - psEnc->sCmn.ltp_mem_length; 626f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org 636f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org /******************************************/ 646f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org /* Estimate LPC AR coeficients */ 656f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org /******************************************/ 666f31ac30b9092fd02a8c97e5216cf53f3e4fae4jshin@chromium.org 67 /* Calculate windowed signal */ 68 69 /* First LA_LTP samples */ 70 x_buf_ptr = x_buf + buf_len - psEnc->sCmn.pitch_LPC_win_length; 71 Wsig_ptr = Wsig; 72 silk_apply_sine_window_FLP( Wsig_ptr, x_buf_ptr, 1, psEnc->sCmn.la_pitch ); 73 74 /* Middle non-windowed samples */ 75 Wsig_ptr += psEnc->sCmn.la_pitch; 76 x_buf_ptr += psEnc->sCmn.la_pitch; 77 silk_memcpy( Wsig_ptr, x_buf_ptr, ( psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 ) ) * sizeof( silk_float ) ); 78 79 /* Last LA_LTP samples */ 80 Wsig_ptr += psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 ); 81 x_buf_ptr += psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 ); 82 silk_apply_sine_window_FLP( Wsig_ptr, x_buf_ptr, 2, psEnc->sCmn.la_pitch ); 83 84 /* Calculate autocorrelation sequence */ 85 silk_autocorrelation_FLP( auto_corr, Wsig, psEnc->sCmn.pitch_LPC_win_length, psEnc->sCmn.pitchEstimationLPCOrder + 1 ); 86 87 /* Add white noise, as a fraction of the energy */ 88 auto_corr[ 0 ] += auto_corr[ 0 ] * FIND_PITCH_WHITE_NOISE_FRACTION + 1; 89 90 /* Calculate the reflection coefficients using Schur */ 91 res_nrg = silk_schur_FLP( refl_coef, auto_corr, psEnc->sCmn.pitchEstimationLPCOrder ); 92 93 /* Prediction gain */ 94 psEncCtrl->predGain = auto_corr[ 0 ] / silk_max_float( res_nrg, 1.0f ); 95 96 /* Convert reflection coefficients to prediction coefficients */ 97 silk_k2a_FLP( A, refl_coef, psEnc->sCmn.pitchEstimationLPCOrder ); 98 99 /* Bandwidth expansion */ 100 silk_bwexpander_FLP( A, psEnc->sCmn.pitchEstimationLPCOrder, FIND_PITCH_BANDWIDTH_EXPANSION ); 101 102 /*****************************************/ 103 /* LPC analysis filtering */ 104 /*****************************************/ 105 silk_LPC_analysis_filter_FLP( res, A, x_buf, buf_len, psEnc->sCmn.pitchEstimationLPCOrder ); 106 107 if( psEnc->sCmn.indices.signalType != TYPE_NO_VOICE_ACTIVITY && psEnc->sCmn.first_frame_after_reset == 0 ) { 108 /* Threshold for pitch estimator */ 109 thrhld = 0.6f; 110 thrhld -= 0.004f * psEnc->sCmn.pitchEstimationLPCOrder; 111 thrhld -= 0.1f * psEnc->sCmn.speech_activity_Q8 * ( 1.0f / 256.0f ); 112 thrhld -= 0.15f * (psEnc->sCmn.prevSignalType >> 1); 113 thrhld -= 0.1f * psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f ); 114 115 /*****************************************/ 116 /* Call Pitch estimator */ 117 /*****************************************/ 118 if( silk_pitch_analysis_core_FLP( res, psEncCtrl->pitchL, &psEnc->sCmn.indices.lagIndex, 119 &psEnc->sCmn.indices.contourIndex, &psEnc->LTPCorr, psEnc->sCmn.prevLag, psEnc->sCmn.pitchEstimationThreshold_Q16 / 65536.0f, 120 thrhld, psEnc->sCmn.fs_kHz, psEnc->sCmn.pitchEstimationComplexity, psEnc->sCmn.nb_subfr, arch ) == 0 ) 121 { 122 psEnc->sCmn.indices.signalType = TYPE_VOICED; 123 } else { 124 psEnc->sCmn.indices.signalType = TYPE_UNVOICED; 125 } 126 } else { 127 silk_memset( psEncCtrl->pitchL, 0, sizeof( psEncCtrl->pitchL ) ); 128 psEnc->sCmn.indices.lagIndex = 0; 129 psEnc->sCmn.indices.contourIndex = 0; 130 psEnc->LTPCorr = 0; 131 } 132} 133