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annotate src/opus-1.3/silk/fixed/find_pitch_lags_FIX.c @ 76:f3731af47c4b

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No, that isn't going to end well. Back it out.
author Chris Cannam
date Sat, 16 Feb 2019 18:32:35 +0000
parents 7aeed7906520
children
rev   line source
Chris@69 1 /***********************************************************************
Chris@69 2 Copyright (c) 2006-2011, Skype Limited. All rights reserved.
Chris@69 3 Redistribution and use in source and binary forms, with or without
Chris@69 4 modification, are permitted provided that the following conditions
Chris@69 5 are met:
Chris@69 6 - Redistributions of source code must retain the above copyright notice,
Chris@69 7 this list of conditions and the following disclaimer.
Chris@69 8 - Redistributions in binary form must reproduce the above copyright
Chris@69 9 notice, this list of conditions and the following disclaimer in the
Chris@69 10 documentation and/or other materials provided with the distribution.
Chris@69 11 - Neither the name of Internet Society, IETF or IETF Trust, nor the
Chris@69 12 names of specific contributors, may be used to endorse or promote
Chris@69 13 products derived from this software without specific prior written
Chris@69 14 permission.
Chris@69 15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
Chris@69 16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
Chris@69 17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
Chris@69 18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
Chris@69 19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
Chris@69 20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
Chris@69 21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
Chris@69 22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
Chris@69 23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
Chris@69 24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
Chris@69 25 POSSIBILITY OF SUCH DAMAGE.
Chris@69 26 ***********************************************************************/
Chris@69 27
Chris@69 28 #ifdef HAVE_CONFIG_H
Chris@69 29 #include "config.h"
Chris@69 30 #endif
Chris@69 31
Chris@69 32 #include "main_FIX.h"
Chris@69 33 #include "stack_alloc.h"
Chris@69 34 #include "tuning_parameters.h"
Chris@69 35
Chris@69 36 /* Find pitch lags */
Chris@69 37 void silk_find_pitch_lags_FIX(
Chris@69 38 silk_encoder_state_FIX *psEnc, /* I/O encoder state */
Chris@69 39 silk_encoder_control_FIX *psEncCtrl, /* I/O encoder control */
Chris@69 40 opus_int16 res[], /* O residual */
Chris@69 41 const opus_int16 x[], /* I Speech signal */
Chris@69 42 int arch /* I Run-time architecture */
Chris@69 43 )
Chris@69 44 {
Chris@69 45 opus_int buf_len, i, scale;
Chris@69 46 opus_int32 thrhld_Q13, res_nrg;
Chris@69 47 const opus_int16 *x_ptr;
Chris@69 48 VARDECL( opus_int16, Wsig );
Chris@69 49 opus_int16 *Wsig_ptr;
Chris@69 50 opus_int32 auto_corr[ MAX_FIND_PITCH_LPC_ORDER + 1 ];
Chris@69 51 opus_int16 rc_Q15[ MAX_FIND_PITCH_LPC_ORDER ];
Chris@69 52 opus_int32 A_Q24[ MAX_FIND_PITCH_LPC_ORDER ];
Chris@69 53 opus_int16 A_Q12[ MAX_FIND_PITCH_LPC_ORDER ];
Chris@69 54 SAVE_STACK;
Chris@69 55
Chris@69 56 /******************************************/
Chris@69 57 /* Set up buffer lengths etc based on Fs */
Chris@69 58 /******************************************/
Chris@69 59 buf_len = psEnc->sCmn.la_pitch + psEnc->sCmn.frame_length + psEnc->sCmn.ltp_mem_length;
Chris@69 60
Chris@69 61 /* Safety check */
Chris@69 62 celt_assert( buf_len >= psEnc->sCmn.pitch_LPC_win_length );
Chris@69 63
Chris@69 64 /*************************************/
Chris@69 65 /* Estimate LPC AR coefficients */
Chris@69 66 /*************************************/
Chris@69 67
Chris@69 68 /* Calculate windowed signal */
Chris@69 69
Chris@69 70 ALLOC( Wsig, psEnc->sCmn.pitch_LPC_win_length, opus_int16 );
Chris@69 71
Chris@69 72 /* First LA_LTP samples */
Chris@69 73 x_ptr = x + buf_len - psEnc->sCmn.pitch_LPC_win_length;
Chris@69 74 Wsig_ptr = Wsig;
Chris@69 75 silk_apply_sine_window( Wsig_ptr, x_ptr, 1, psEnc->sCmn.la_pitch );
Chris@69 76
Chris@69 77 /* Middle un - windowed samples */
Chris@69 78 Wsig_ptr += psEnc->sCmn.la_pitch;
Chris@69 79 x_ptr += psEnc->sCmn.la_pitch;
Chris@69 80 silk_memcpy( Wsig_ptr, x_ptr, ( psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 ) ) * sizeof( opus_int16 ) );
Chris@69 81
Chris@69 82 /* Last LA_LTP samples */
Chris@69 83 Wsig_ptr += psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 );
Chris@69 84 x_ptr += psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 );
Chris@69 85 silk_apply_sine_window( Wsig_ptr, x_ptr, 2, psEnc->sCmn.la_pitch );
Chris@69 86
Chris@69 87 /* Calculate autocorrelation sequence */
Chris@69 88 silk_autocorr( auto_corr, &scale, Wsig, psEnc->sCmn.pitch_LPC_win_length, psEnc->sCmn.pitchEstimationLPCOrder + 1, arch );
Chris@69 89
Chris@69 90 /* Add white noise, as fraction of energy */
Chris@69 91 auto_corr[ 0 ] = silk_SMLAWB( auto_corr[ 0 ], auto_corr[ 0 ], SILK_FIX_CONST( FIND_PITCH_WHITE_NOISE_FRACTION, 16 ) ) + 1;
Chris@69 92
Chris@69 93 /* Calculate the reflection coefficients using schur */
Chris@69 94 res_nrg = silk_schur( rc_Q15, auto_corr, psEnc->sCmn.pitchEstimationLPCOrder );
Chris@69 95
Chris@69 96 /* Prediction gain */
Chris@69 97 psEncCtrl->predGain_Q16 = silk_DIV32_varQ( auto_corr[ 0 ], silk_max_int( res_nrg, 1 ), 16 );
Chris@69 98
Chris@69 99 /* Convert reflection coefficients to prediction coefficients */
Chris@69 100 silk_k2a( A_Q24, rc_Q15, psEnc->sCmn.pitchEstimationLPCOrder );
Chris@69 101
Chris@69 102 /* Convert From 32 bit Q24 to 16 bit Q12 coefs */
Chris@69 103 for( i = 0; i < psEnc->sCmn.pitchEstimationLPCOrder; i++ ) {
Chris@69 104 A_Q12[ i ] = (opus_int16)silk_SAT16( silk_RSHIFT( A_Q24[ i ], 12 ) );
Chris@69 105 }
Chris@69 106
Chris@69 107 /* Do BWE */
Chris@69 108 silk_bwexpander( A_Q12, psEnc->sCmn.pitchEstimationLPCOrder, SILK_FIX_CONST( FIND_PITCH_BANDWIDTH_EXPANSION, 16 ) );
Chris@69 109
Chris@69 110 /*****************************************/
Chris@69 111 /* LPC analysis filtering */
Chris@69 112 /*****************************************/
Chris@69 113 silk_LPC_analysis_filter( res, x, A_Q12, buf_len, psEnc->sCmn.pitchEstimationLPCOrder, psEnc->sCmn.arch );
Chris@69 114
Chris@69 115 if( psEnc->sCmn.indices.signalType != TYPE_NO_VOICE_ACTIVITY && psEnc->sCmn.first_frame_after_reset == 0 ) {
Chris@69 116 /* Threshold for pitch estimator */
Chris@69 117 thrhld_Q13 = SILK_FIX_CONST( 0.6, 13 );
Chris@69 118 thrhld_Q13 = silk_SMLABB( thrhld_Q13, SILK_FIX_CONST( -0.004, 13 ), psEnc->sCmn.pitchEstimationLPCOrder );
Chris@69 119 thrhld_Q13 = silk_SMLAWB( thrhld_Q13, SILK_FIX_CONST( -0.1, 21 ), psEnc->sCmn.speech_activity_Q8 );
Chris@69 120 thrhld_Q13 = silk_SMLABB( thrhld_Q13, SILK_FIX_CONST( -0.15, 13 ), silk_RSHIFT( psEnc->sCmn.prevSignalType, 1 ) );
Chris@69 121 thrhld_Q13 = silk_SMLAWB( thrhld_Q13, SILK_FIX_CONST( -0.1, 14 ), psEnc->sCmn.input_tilt_Q15 );
Chris@69 122 thrhld_Q13 = silk_SAT16( thrhld_Q13 );
Chris@69 123
Chris@69 124 /*****************************************/
Chris@69 125 /* Call pitch estimator */
Chris@69 126 /*****************************************/
Chris@69 127 if( silk_pitch_analysis_core( res, psEncCtrl->pitchL, &psEnc->sCmn.indices.lagIndex, &psEnc->sCmn.indices.contourIndex,
Chris@69 128 &psEnc->LTPCorr_Q15, psEnc->sCmn.prevLag, psEnc->sCmn.pitchEstimationThreshold_Q16,
Chris@69 129 (opus_int)thrhld_Q13, psEnc->sCmn.fs_kHz, psEnc->sCmn.pitchEstimationComplexity, psEnc->sCmn.nb_subfr,
Chris@69 130 psEnc->sCmn.arch) == 0 )
Chris@69 131 {
Chris@69 132 psEnc->sCmn.indices.signalType = TYPE_VOICED;
Chris@69 133 } else {
Chris@69 134 psEnc->sCmn.indices.signalType = TYPE_UNVOICED;
Chris@69 135 }
Chris@69 136 } else {
Chris@69 137 silk_memset( psEncCtrl->pitchL, 0, sizeof( psEncCtrl->pitchL ) );
Chris@69 138 psEnc->sCmn.indices.lagIndex = 0;
Chris@69 139 psEnc->sCmn.indices.contourIndex = 0;
Chris@69 140 psEnc->LTPCorr_Q15 = 0;
Chris@69 141 }
Chris@69 142 RESTORE_STACK;
Chris@69 143 }