Fix common misspellings
[opus.git] / silk / fixed / find_pitch_lags_FIX.c
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 "main_FIX.h"
33 #include "tuning_parameters.h"
34
35 /* Find pitch lags */
36 void silk_find_pitch_lags_FIX(
37     silk_encoder_state_FIX          *psEnc,                                 /* I/O  encoder state                                                               */
38     silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  encoder control                                                             */
39     opus_int16                      res[],                                  /* O    residual                                                                    */
40     const opus_int16                x[]                                     /* I    Speech signal                                                               */
41 )
42 {
43     opus_int   buf_len, i, scale;
44     opus_int32 thrhld_Q15, res_nrg;
45     const opus_int16 *x_buf, *x_buf_ptr;
46     opus_int16 Wsig[      FIND_PITCH_LPC_WIN_MAX ], *Wsig_ptr;
47     opus_int32 auto_corr[ MAX_FIND_PITCH_LPC_ORDER + 1 ];
48     opus_int16 rc_Q15[    MAX_FIND_PITCH_LPC_ORDER ];
49     opus_int32 A_Q24[     MAX_FIND_PITCH_LPC_ORDER ];
50     opus_int16 A_Q12[     MAX_FIND_PITCH_LPC_ORDER ];
51
52     /******************************************/
53     /* Set up buffer lengths etc based on Fs  */
54     /******************************************/
55     buf_len = psEnc->sCmn.la_pitch + psEnc->sCmn.frame_length + psEnc->sCmn.ltp_mem_length;
56
57     /* Safety check */
58     silk_assert( buf_len >= psEnc->sCmn.pitch_LPC_win_length );
59
60     x_buf = x - psEnc->sCmn.ltp_mem_length;
61
62     /*************************************/
63     /* Estimate LPC AR coefficients      */
64     /*************************************/
65
66     /* Calculate windowed signal */
67
68     /* First LA_LTP samples */
69     x_buf_ptr = x_buf + buf_len - psEnc->sCmn.pitch_LPC_win_length;
70     Wsig_ptr  = Wsig;
71     silk_apply_sine_window( Wsig_ptr, x_buf_ptr, 1, psEnc->sCmn.la_pitch );
72
73     /* Middle un - windowed samples */
74     Wsig_ptr  += psEnc->sCmn.la_pitch;
75     x_buf_ptr += psEnc->sCmn.la_pitch;
76     silk_memcpy( Wsig_ptr, x_buf_ptr, ( psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 ) ) * sizeof( opus_int16 ) );
77
78     /* Last LA_LTP samples */
79     Wsig_ptr  += psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 );
80     x_buf_ptr += psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 );
81     silk_apply_sine_window( Wsig_ptr, x_buf_ptr, 2, psEnc->sCmn.la_pitch );
82
83     /* Calculate autocorrelation sequence */
84     silk_autocorr( auto_corr, &scale, Wsig, psEnc->sCmn.pitch_LPC_win_length, psEnc->sCmn.pitchEstimationLPCOrder + 1 );
85
86     /* Add white noise, as fraction of energy */
87     auto_corr[ 0 ] = silk_SMLAWB( auto_corr[ 0 ], auto_corr[ 0 ], SILK_FIX_CONST( FIND_PITCH_WHITE_NOISE_FRACTION, 16 ) ) + 1;
88
89     /* Calculate the reflection coefficients using schur */
90     res_nrg = silk_schur( rc_Q15, auto_corr, psEnc->sCmn.pitchEstimationLPCOrder );
91
92     /* Prediction gain */
93     psEncCtrl->predGain_Q16 = silk_DIV32_varQ( auto_corr[ 0 ], silk_max_int( res_nrg, 1 ), 16 );
94
95     /* Convert reflection coefficients to prediction coefficients */
96     silk_k2a( A_Q24, rc_Q15, psEnc->sCmn.pitchEstimationLPCOrder );
97
98     /* Convert From 32 bit Q24 to 16 bit Q12 coefs */
99     for( i = 0; i < psEnc->sCmn.pitchEstimationLPCOrder; i++ ) {
100         A_Q12[ i ] = (opus_int16)silk_SAT16( silk_RSHIFT( A_Q24[ i ], 12 ) );
101     }
102
103     /* Do BWE */
104     silk_bwexpander( A_Q12, psEnc->sCmn.pitchEstimationLPCOrder, SILK_FIX_CONST( FIND_PITCH_BANDWITH_EXPANSION, 16 ) );
105
106     /*****************************************/
107     /* LPC analysis filtering                */
108     /*****************************************/
109     silk_LPC_analysis_filter( res, x_buf, A_Q12, buf_len, psEnc->sCmn.pitchEstimationLPCOrder );
110
111     if( psEnc->sCmn.indices.signalType != TYPE_NO_VOICE_ACTIVITY && psEnc->sCmn.first_frame_after_reset == 0 ) {
112         /* Threshold for pitch estimator */
113         thrhld_Q15 = SILK_FIX_CONST( 0.6, 15 );
114         thrhld_Q15 = silk_SMLABB( thrhld_Q15, SILK_FIX_CONST( -0.004, 15 ), psEnc->sCmn.pitchEstimationLPCOrder );
115         thrhld_Q15 = silk_SMLABB( thrhld_Q15, SILK_FIX_CONST( -0.1,   7  ), psEnc->sCmn.speech_activity_Q8 );
116         thrhld_Q15 = silk_SMLABB( thrhld_Q15, SILK_FIX_CONST( -0.15,  15 ), silk_RSHIFT( psEnc->sCmn.prevSignalType, 1 ) );
117         thrhld_Q15 = silk_SMLAWB( thrhld_Q15, SILK_FIX_CONST( -0.1,   16 ), psEnc->sCmn.input_tilt_Q15 );
118         thrhld_Q15 = silk_SAT16(  thrhld_Q15 );
119
120         /*****************************************/
121         /* Call pitch estimator                  */
122         /*****************************************/
123         if( silk_pitch_analysis_core( res, psEncCtrl->pitchL, &psEnc->sCmn.indices.lagIndex, &psEnc->sCmn.indices.contourIndex,
124                 &psEnc->LTPCorr_Q15, psEnc->sCmn.prevLag, psEnc->sCmn.pitchEstimationThreshold_Q16,
125                 (opus_int16)thrhld_Q15, psEnc->sCmn.fs_kHz, psEnc->sCmn.pitchEstimationComplexity, psEnc->sCmn.nb_subfr ) == 0 )
126         {
127             psEnc->sCmn.indices.signalType = TYPE_VOICED;
128         } else {
129             psEnc->sCmn.indices.signalType = TYPE_UNVOICED;
130         }
131     } else {
132         silk_memset( psEncCtrl->pitchL, 0, sizeof( psEncCtrl->pitchL ) );
133         psEnc->sCmn.indices.lagIndex = 0;
134         psEnc->sCmn.indices.contourIndex = 0;
135         psEnc->LTPCorr_Q15 = 0;
136     }
137 }