b8440a8247a31ce4cf768f6f148dd4a9e75f3533
[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
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10 documentation and/or other materials provided with the distribution.
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12 names of specific contributors, may be used to endorse or promote
13 products derived from this software without specific prior written
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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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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 "stack_alloc.h"
34 #include "tuning_parameters.h"
35
36 /* Find pitch lags */
37 void silk_find_pitch_lags_FIX(
38     silk_encoder_state_FIX          *psEnc,                                 /* I/O  encoder state                                                               */
39     silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  encoder control                                                             */
40     opus_int16                      res[],                                  /* O    residual                                                                    */
41     const opus_int16                x[],                                    /* I    Speech signal                                                               */
42     int                             arch                                    /* I    Run-time architecture                                                       */
43 )
44 {
45     opus_int   buf_len, i, scale;
46     opus_int32 thrhld_Q13, res_nrg;
47     const opus_int16 *x_buf, *x_buf_ptr;
48     VARDECL( opus_int16, Wsig );
49     opus_int16 *Wsig_ptr;
50     opus_int32 auto_corr[ MAX_FIND_PITCH_LPC_ORDER + 1 ];
51     opus_int16 rc_Q15[    MAX_FIND_PITCH_LPC_ORDER ];
52     opus_int32 A_Q24[     MAX_FIND_PITCH_LPC_ORDER ];
53     opus_int16 A_Q12[     MAX_FIND_PITCH_LPC_ORDER ];
54     SAVE_STACK;
55
56     /******************************************/
57     /* Set up buffer lengths etc based on Fs  */
58     /******************************************/
59     buf_len = psEnc->sCmn.la_pitch + psEnc->sCmn.frame_length + psEnc->sCmn.ltp_mem_length;
60
61     /* Safety check */
62     silk_assert( buf_len >= psEnc->sCmn.pitch_LPC_win_length );
63
64     x_buf = x - psEnc->sCmn.ltp_mem_length;
65
66     /*************************************/
67     /* Estimate LPC AR coefficients      */
68     /*************************************/
69
70     /* Calculate windowed signal */
71
72     ALLOC( Wsig, psEnc->sCmn.pitch_LPC_win_length, opus_int16 );
73
74     /* First LA_LTP samples */
75     x_buf_ptr = x_buf + buf_len - psEnc->sCmn.pitch_LPC_win_length;
76     Wsig_ptr  = Wsig;
77     silk_apply_sine_window( Wsig_ptr, x_buf_ptr, 1, psEnc->sCmn.la_pitch );
78
79     /* Middle un - windowed samples */
80     Wsig_ptr  += psEnc->sCmn.la_pitch;
81     x_buf_ptr += psEnc->sCmn.la_pitch;
82     silk_memcpy( Wsig_ptr, x_buf_ptr, ( psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 ) ) * sizeof( opus_int16 ) );
83
84     /* Last LA_LTP samples */
85     Wsig_ptr  += psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 );
86     x_buf_ptr += psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 );
87     silk_apply_sine_window( Wsig_ptr, x_buf_ptr, 2, psEnc->sCmn.la_pitch );
88
89     /* Calculate autocorrelation sequence */
90     silk_autocorr( auto_corr, &scale, Wsig, psEnc->sCmn.pitch_LPC_win_length, psEnc->sCmn.pitchEstimationLPCOrder + 1, arch );
91
92     /* Add white noise, as fraction of energy */
93     auto_corr[ 0 ] = silk_SMLAWB( auto_corr[ 0 ], auto_corr[ 0 ], SILK_FIX_CONST( FIND_PITCH_WHITE_NOISE_FRACTION, 16 ) ) + 1;
94
95     /* Calculate the reflection coefficients using schur */
96     res_nrg = silk_schur( rc_Q15, auto_corr, psEnc->sCmn.pitchEstimationLPCOrder );
97
98     /* Prediction gain */
99     psEncCtrl->predGain_Q16 = silk_DIV32_varQ( auto_corr[ 0 ], silk_max_int( res_nrg, 1 ), 16 );
100
101     /* Convert reflection coefficients to prediction coefficients */
102     silk_k2a( A_Q24, rc_Q15, psEnc->sCmn.pitchEstimationLPCOrder );
103
104     /* Convert From 32 bit Q24 to 16 bit Q12 coefs */
105     for( i = 0; i < psEnc->sCmn.pitchEstimationLPCOrder; i++ ) {
106         A_Q12[ i ] = (opus_int16)silk_SAT16( silk_RSHIFT( A_Q24[ i ], 12 ) );
107     }
108
109     /* Do BWE */
110     silk_bwexpander( A_Q12, psEnc->sCmn.pitchEstimationLPCOrder, SILK_FIX_CONST( FIND_PITCH_BANDWIDTH_EXPANSION, 16 ) );
111
112     /*****************************************/
113     /* LPC analysis filtering                */
114     /*****************************************/
115     silk_LPC_analysis_filter( res, x_buf, A_Q12, buf_len, psEnc->sCmn.pitchEstimationLPCOrder, psEnc->sCmn.arch );
116
117     if( psEnc->sCmn.indices.signalType != TYPE_NO_VOICE_ACTIVITY && psEnc->sCmn.first_frame_after_reset == 0 ) {
118         /* Threshold for pitch estimator */
119         thrhld_Q13 = SILK_FIX_CONST( 0.6, 13 );
120         thrhld_Q13 = silk_SMLABB( thrhld_Q13, SILK_FIX_CONST( -0.004, 13 ), psEnc->sCmn.pitchEstimationLPCOrder );
121         thrhld_Q13 = silk_SMLAWB( thrhld_Q13, SILK_FIX_CONST( -0.1,   21  ), psEnc->sCmn.speech_activity_Q8 );
122         thrhld_Q13 = silk_SMLABB( thrhld_Q13, SILK_FIX_CONST( -0.15,  13 ), silk_RSHIFT( psEnc->sCmn.prevSignalType, 1 ) );
123         thrhld_Q13 = silk_SMLAWB( thrhld_Q13, SILK_FIX_CONST( -0.1,   14 ), psEnc->sCmn.input_tilt_Q15 );
124         thrhld_Q13 = silk_SAT16(  thrhld_Q13 );
125
126         /*****************************************/
127         /* Call pitch estimator                  */
128         /*****************************************/
129         if( silk_pitch_analysis_core( res, psEncCtrl->pitchL, &psEnc->sCmn.indices.lagIndex, &psEnc->sCmn.indices.contourIndex,
130                 &psEnc->LTPCorr_Q15, psEnc->sCmn.prevLag, psEnc->sCmn.pitchEstimationThreshold_Q16,
131                 (opus_int)thrhld_Q13, psEnc->sCmn.fs_kHz, psEnc->sCmn.pitchEstimationComplexity, psEnc->sCmn.nb_subfr,
132                 psEnc->sCmn.arch) == 0 )
133         {
134             psEnc->sCmn.indices.signalType = TYPE_VOICED;
135         } else {
136             psEnc->sCmn.indices.signalType = TYPE_UNVOICED;
137         }
138     } else {
139         silk_memset( psEncCtrl->pitchL, 0, sizeof( psEncCtrl->pitchL ) );
140         psEnc->sCmn.indices.lagIndex = 0;
141         psEnc->sCmn.indices.contourIndex = 0;
142         psEnc->LTPCorr_Q15 = 0;
143     }
144     RESTORE_STACK;
145 }