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2 Copyright (c) 2006-2011, Skype Limited. All rights reserved.
3 Redistribution and use in source and binary forms, with or without
4 modification, are permitted provided that the following conditions
5 are met:
6 - Redistributions of source code must retain the above copyright notice,
7 this list of conditions and the following disclaimer.
8 - Redistributions in binary form must reproduce the above copyright
9 notice, this list of conditions and the following disclaimer in the
10 documentation and/or other materials provided with the distribution.
11 - Neither the name of Internet Society, IETF or IETF Trust, nor the
12 names of specific contributors, may be used to endorse or promote
13 products derived from this software without specific prior written
14 permission.
15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 POSSIBILITY OF SUCH DAMAGE.
26 ***********************************************************************/
27
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31
32 #include <stdlib.h>
33 #include "main_FLP.h"
34 #include "tuning_parameters.h"
35
silk_find_pitch_lags_FLP(silk_encoder_state_FLP * psEnc,silk_encoder_control_FLP * psEncCtrl,silk_float res[],const silk_float x[],int arch)36 void silk_find_pitch_lags_FLP(
37 silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
38 silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
39 silk_float res[], /* O Residual */
40 const silk_float x[], /* I Speech signal */
41 int arch /* I Run-time architecture */
42 )
43 {
44 opus_int buf_len;
45 silk_float thrhld, res_nrg;
46 const silk_float *x_buf_ptr, *x_buf;
47 silk_float auto_corr[ MAX_FIND_PITCH_LPC_ORDER + 1 ];
48 silk_float A[ MAX_FIND_PITCH_LPC_ORDER ];
49 silk_float refl_coef[ MAX_FIND_PITCH_LPC_ORDER ];
50 silk_float Wsig[ FIND_PITCH_LPC_WIN_MAX ];
51 silk_float *Wsig_ptr;
52
53 /******************************************/
54 /* Set up buffer lengths etc based on Fs */
55 /******************************************/
56 buf_len = psEnc->sCmn.la_pitch + psEnc->sCmn.frame_length + psEnc->sCmn.ltp_mem_length;
57
58 /* Safety check */
59 silk_assert( buf_len >= psEnc->sCmn.pitch_LPC_win_length );
60
61 x_buf = x - psEnc->sCmn.ltp_mem_length;
62
63 /******************************************/
64 /* Estimate LPC AR coeficients */
65 /******************************************/
66
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