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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 
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