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media/libopus/silk/float/find_pitch_lags_FLP.c@b8a032363ba2 (annotated)

media/libopus/silk/float/find_pitch_lags_FLP.c

Thu, 22 Jan 2015 13:21:57 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Thu, 22 Jan 2015 13:21:57 +0100
branch
TOR_BUG_9701
changeset 15
b8a032363ba2
permissions
-rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

michael@0 1 /***********************************************************************
michael@0 2 Copyright (c) 2006-2011, Skype Limited. All rights reserved.
michael@0 3 Redistribution and use in source and binary forms, with or without
michael@0 4 modification, are permitted provided that the following conditions
michael@0 5 are met:
michael@0 6 - Redistributions of source code must retain the above copyright notice,
michael@0 7 this list of conditions and the following disclaimer.
michael@0 8 - Redistributions in binary form must reproduce the above copyright
michael@0 9 notice, this list of conditions and the following disclaimer in the
michael@0 10 documentation and/or other materials provided with the distribution.
michael@0 11 - Neither the name of Internet Society, IETF or IETF Trust, nor the
michael@0 12 names of specific contributors, may be used to endorse or promote
michael@0 13 products derived from this software without specific prior written
michael@0 14 permission.
michael@0 15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
michael@0 16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
michael@0 17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
michael@0 18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
michael@0 19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
michael@0 20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
michael@0 21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
michael@0 22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
michael@0 23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
michael@0 24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
michael@0 25 POSSIBILITY OF SUCH DAMAGE.
michael@0 26 ***********************************************************************/
michael@0 27
michael@0 28 #ifdef HAVE_CONFIG_H
michael@0 29 #include "config.h"
michael@0 30 #endif
michael@0 31
michael@0 32 #include <stdlib.h>
michael@0 33 #include "main_FLP.h"
michael@0 34 #include "tuning_parameters.h"
michael@0 35
michael@0 36 void silk_find_pitch_lags_FLP(
michael@0 37 silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
michael@0 38 silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
michael@0 39 silk_float res[], /* O Residual */
michael@0 40 const silk_float x[], /* I Speech signal */
michael@0 41 int arch /* I Run-time architecture */
michael@0 42 )
michael@0 43 {
michael@0 44 opus_int buf_len;
michael@0 45 silk_float thrhld, res_nrg;
michael@0 46 const silk_float *x_buf_ptr, *x_buf;
michael@0 47 silk_float auto_corr[ MAX_FIND_PITCH_LPC_ORDER + 1 ];
michael@0 48 silk_float A[ MAX_FIND_PITCH_LPC_ORDER ];
michael@0 49 silk_float refl_coef[ MAX_FIND_PITCH_LPC_ORDER ];
michael@0 50 silk_float Wsig[ FIND_PITCH_LPC_WIN_MAX ];
michael@0 51 silk_float *Wsig_ptr;
michael@0 52
michael@0 53 /******************************************/
michael@0 54 /* Set up buffer lengths etc based on Fs */
michael@0 55 /******************************************/
michael@0 56 buf_len = psEnc->sCmn.la_pitch + psEnc->sCmn.frame_length + psEnc->sCmn.ltp_mem_length;
michael@0 57
michael@0 58 /* Safety check */
michael@0 59 silk_assert( buf_len >= psEnc->sCmn.pitch_LPC_win_length );
michael@0 60
michael@0 61 x_buf = x - psEnc->sCmn.ltp_mem_length;
michael@0 62
michael@0 63 /******************************************/
michael@0 64 /* Estimate LPC AR coeficients */
michael@0 65 /******************************************/
michael@0 66
michael@0 67 /* Calculate windowed signal */
michael@0 68
michael@0 69 /* First LA_LTP samples */
michael@0 70 x_buf_ptr = x_buf + buf_len - psEnc->sCmn.pitch_LPC_win_length;
michael@0 71 Wsig_ptr = Wsig;
michael@0 72 silk_apply_sine_window_FLP( Wsig_ptr, x_buf_ptr, 1, psEnc->sCmn.la_pitch );
michael@0 73
michael@0 74 /* Middle non-windowed samples */
michael@0 75 Wsig_ptr += psEnc->sCmn.la_pitch;
michael@0 76 x_buf_ptr += psEnc->sCmn.la_pitch;
michael@0 77 silk_memcpy( Wsig_ptr, x_buf_ptr, ( psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 ) ) * sizeof( silk_float ) );
michael@0 78
michael@0 79 /* Last LA_LTP samples */
michael@0 80 Wsig_ptr += psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 );
michael@0 81 x_buf_ptr += psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 );
michael@0 82 silk_apply_sine_window_FLP( Wsig_ptr, x_buf_ptr, 2, psEnc->sCmn.la_pitch );
michael@0 83
michael@0 84 /* Calculate autocorrelation sequence */
michael@0 85 silk_autocorrelation_FLP( auto_corr, Wsig, psEnc->sCmn.pitch_LPC_win_length, psEnc->sCmn.pitchEstimationLPCOrder + 1 );
michael@0 86
michael@0 87 /* Add white noise, as a fraction of the energy */
michael@0 88 auto_corr[ 0 ] += auto_corr[ 0 ] * FIND_PITCH_WHITE_NOISE_FRACTION + 1;
michael@0 89
michael@0 90 /* Calculate the reflection coefficients using Schur */
michael@0 91 res_nrg = silk_schur_FLP( refl_coef, auto_corr, psEnc->sCmn.pitchEstimationLPCOrder );
michael@0 92
michael@0 93 /* Prediction gain */
michael@0 94 psEncCtrl->predGain = auto_corr[ 0 ] / silk_max_float( res_nrg, 1.0f );
michael@0 95
michael@0 96 /* Convert reflection coefficients to prediction coefficients */
michael@0 97 silk_k2a_FLP( A, refl_coef, psEnc->sCmn.pitchEstimationLPCOrder );
michael@0 98
michael@0 99 /* Bandwidth expansion */
michael@0 100 silk_bwexpander_FLP( A, psEnc->sCmn.pitchEstimationLPCOrder, FIND_PITCH_BANDWIDTH_EXPANSION );
michael@0 101
michael@0 102 /*****************************************/
michael@0 103 /* LPC analysis filtering */
michael@0 104 /*****************************************/
michael@0 105 silk_LPC_analysis_filter_FLP( res, A, x_buf, buf_len, psEnc->sCmn.pitchEstimationLPCOrder );
michael@0 106
michael@0 107 if( psEnc->sCmn.indices.signalType != TYPE_NO_VOICE_ACTIVITY && psEnc->sCmn.first_frame_after_reset == 0 ) {
michael@0 108 /* Threshold for pitch estimator */
michael@0 109 thrhld = 0.6f;
michael@0 110 thrhld -= 0.004f * psEnc->sCmn.pitchEstimationLPCOrder;
michael@0 111 thrhld -= 0.1f * psEnc->sCmn.speech_activity_Q8 * ( 1.0f / 256.0f );
michael@0 112 thrhld -= 0.15f * (psEnc->sCmn.prevSignalType >> 1);
michael@0 113 thrhld -= 0.1f * psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f );
michael@0 114
michael@0 115 /*****************************************/
michael@0 116 /* Call Pitch estimator */
michael@0 117 /*****************************************/
michael@0 118 if( silk_pitch_analysis_core_FLP( res, psEncCtrl->pitchL, &psEnc->sCmn.indices.lagIndex,
michael@0 119 &psEnc->sCmn.indices.contourIndex, &psEnc->LTPCorr, psEnc->sCmn.prevLag, psEnc->sCmn.pitchEstimationThreshold_Q16 / 65536.0f,
michael@0 120 thrhld, psEnc->sCmn.fs_kHz, psEnc->sCmn.pitchEstimationComplexity, psEnc->sCmn.nb_subfr, arch ) == 0 )
michael@0 121 {
michael@0 122 psEnc->sCmn.indices.signalType = TYPE_VOICED;
michael@0 123 } else {
michael@0 124 psEnc->sCmn.indices.signalType = TYPE_UNVOICED;
michael@0 125 }
michael@0 126 } else {
michael@0 127 silk_memset( psEncCtrl->pitchL, 0, sizeof( psEncCtrl->pitchL ) );
michael@0 128 psEnc->sCmn.indices.lagIndex = 0;
michael@0 129 psEnc->sCmn.indices.contourIndex = 0;
michael@0 130 psEnc->LTPCorr = 0;
michael@0 131 }
michael@0 132 }

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