Line data Source code
1 : /***********************************************************************
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
22 : INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 :
36 0 : 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 0 : buf_len = psEnc->sCmn.la_pitch + psEnc->sCmn.frame_length + psEnc->sCmn.ltp_mem_length;
57 :
58 : /* Safety check */
59 0 : silk_assert( buf_len >= psEnc->sCmn.pitch_LPC_win_length );
60 :
61 0 : 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 0 : x_buf_ptr = x_buf + buf_len - psEnc->sCmn.pitch_LPC_win_length;
71 0 : Wsig_ptr = Wsig;
72 0 : silk_apply_sine_window_FLP( Wsig_ptr, x_buf_ptr, 1, psEnc->sCmn.la_pitch );
73 :
74 : /* Middle non-windowed samples */
75 0 : Wsig_ptr += psEnc->sCmn.la_pitch;
76 0 : x_buf_ptr += psEnc->sCmn.la_pitch;
77 0 : 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 0 : Wsig_ptr += psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 );
81 0 : x_buf_ptr += psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 );
82 0 : silk_apply_sine_window_FLP( Wsig_ptr, x_buf_ptr, 2, psEnc->sCmn.la_pitch );
83 :
84 : /* Calculate autocorrelation sequence */
85 0 : 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 0 : auto_corr[ 0 ] += auto_corr[ 0 ] * FIND_PITCH_WHITE_NOISE_FRACTION + 1;
89 :
90 : /* Calculate the reflection coefficients using Schur */
91 0 : res_nrg = silk_schur_FLP( refl_coef, auto_corr, psEnc->sCmn.pitchEstimationLPCOrder );
92 :
93 : /* Prediction gain */
94 0 : psEncCtrl->predGain = auto_corr[ 0 ] / silk_max_float( res_nrg, 1.0f );
95 :
96 : /* Convert reflection coefficients to prediction coefficients */
97 0 : silk_k2a_FLP( A, refl_coef, psEnc->sCmn.pitchEstimationLPCOrder );
98 :
99 : /* Bandwidth expansion */
100 0 : silk_bwexpander_FLP( A, psEnc->sCmn.pitchEstimationLPCOrder, FIND_PITCH_BANDWIDTH_EXPANSION );
101 :
102 : /*****************************************/
103 : /* LPC analysis filtering */
104 : /*****************************************/
105 0 : silk_LPC_analysis_filter_FLP( res, A, x_buf, buf_len, psEnc->sCmn.pitchEstimationLPCOrder );
106 :
107 0 : if( psEnc->sCmn.indices.signalType != TYPE_NO_VOICE_ACTIVITY && psEnc->sCmn.first_frame_after_reset == 0 ) {
108 : /* Threshold for pitch estimator */
109 0 : thrhld = 0.6f;
110 0 : thrhld -= 0.004f * psEnc->sCmn.pitchEstimationLPCOrder;
111 0 : thrhld -= 0.1f * psEnc->sCmn.speech_activity_Q8 * ( 1.0f / 256.0f );
112 0 : thrhld -= 0.15f * (psEnc->sCmn.prevSignalType >> 1);
113 0 : thrhld -= 0.1f * psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f );
114 :
115 : /*****************************************/
116 : /* Call Pitch estimator */
117 : /*****************************************/
118 0 : if( silk_pitch_analysis_core_FLP( res, psEncCtrl->pitchL, &psEnc->sCmn.indices.lagIndex,
119 0 : &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 0 : psEnc->sCmn.indices.signalType = TYPE_VOICED;
123 : } else {
124 0 : psEnc->sCmn.indices.signalType = TYPE_UNVOICED;
125 : }
126 : } else {
127 0 : silk_memset( psEncCtrl->pitchL, 0, sizeof( psEncCtrl->pitchL ) );
128 0 : psEnc->sCmn.indices.lagIndex = 0;
129 0 : psEnc->sCmn.indices.contourIndex = 0;
130 0 : psEnc->LTPCorr = 0;
131 : }
132 0 : }
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