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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
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11 - Neither the name of Internet Society, IETF or IETF Trust, nor the
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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
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18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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26 ***********************************************************************/
27
28 //#ifdef HAVE_CONFIG_H
29 #include "opus__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 celt_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