Small cleanups to MSVC build setup.
[opus.git] / silk / float / find_pitch_lags_FLP.c
1 /***********************************************************************
2 Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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7 this list of conditions and the following disclaimer.
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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
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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
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
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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 <stdlib.h>
33 #include "main_FLP.h"
34 #include "tuning_parameters.h"
35
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 )
42 {
43     opus_int   buf_len;
44     silk_float thrhld, res_nrg;
45     const silk_float *x_buf_ptr, *x_buf;
46     silk_float auto_corr[ MAX_FIND_PITCH_LPC_ORDER + 1 ];
47     silk_float A[         MAX_FIND_PITCH_LPC_ORDER ];
48     silk_float refl_coef[ MAX_FIND_PITCH_LPC_ORDER ];
49     silk_float Wsig[      FIND_PITCH_LPC_WIN_MAX ];
50     silk_float *Wsig_ptr;
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     /* Safty 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 coeficients            */
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_FLP( Wsig_ptr, x_buf_ptr, 1, psEnc->sCmn.la_pitch );
72
73     /* Middle non-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 - ( psEnc->sCmn.la_pitch << 1 ) ) * sizeof( silk_float ) );
77
78     /* Last LA_LTP samples */
79     Wsig_ptr  += psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 );
80     x_buf_ptr += psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 );
81     silk_apply_sine_window_FLP( Wsig_ptr, x_buf_ptr, 2, psEnc->sCmn.la_pitch );
82
83     /* Calculate autocorrelation sequence */
84     silk_autocorrelation_FLP( auto_corr, Wsig, psEnc->sCmn.pitch_LPC_win_length, psEnc->sCmn.pitchEstimationLPCOrder + 1 );
85
86     /* Add white noise, as a fraction of the energy */
87     auto_corr[ 0 ] += auto_corr[ 0 ] * FIND_PITCH_WHITE_NOISE_FRACTION + 1;
88
89     /* Calculate the reflection coefficients using Schur */
90     res_nrg = silk_schur_FLP( refl_coef, auto_corr, psEnc->sCmn.pitchEstimationLPCOrder );
91
92     /* Prediction gain */
93     psEncCtrl->predGain = auto_corr[ 0 ] / silk_max_float( res_nrg, 1.0f );
94
95     /* Convert reflection coefficients to prediction coefficients */
96     silk_k2a_FLP( A, refl_coef, psEnc->sCmn.pitchEstimationLPCOrder );
97
98     /* Bandwidth expansion */
99     silk_bwexpander_FLP( A, psEnc->sCmn.pitchEstimationLPCOrder, FIND_PITCH_BANDWITH_EXPANSION );
100
101     /*****************************************/
102     /* LPC analysis filtering                */
103     /*****************************************/
104     silk_LPC_analysis_filter_FLP( res, A, x_buf, buf_len, psEnc->sCmn.pitchEstimationLPCOrder );
105
106     if( psEnc->sCmn.indices.signalType != TYPE_NO_VOICE_ACTIVITY && psEnc->sCmn.first_frame_after_reset == 0 ) {
107         /* Threshold for pitch estimator */
108         thrhld  = 0.6f;
109         thrhld -= 0.004f * psEnc->sCmn.pitchEstimationLPCOrder;
110         thrhld -= 0.1f   * psEnc->sCmn.speech_activity_Q8 * ( 1.0f /  256.0f );
111         thrhld -= 0.15f  * (psEnc->sCmn.prevSignalType >> 1);
112         thrhld -= 0.1f   * psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f );
113
114         /*****************************************/
115         /* Call Pitch estimator                  */
116         /*****************************************/
117         if( silk_pitch_analysis_core_FLP( res, psEncCtrl->pitchL, &psEnc->sCmn.indices.lagIndex,
118             &psEnc->sCmn.indices.contourIndex, &psEnc->LTPCorr, psEnc->sCmn.prevLag, psEnc->sCmn.pitchEstimationThreshold_Q16 / 65536.0f,
119             thrhld, psEnc->sCmn.fs_kHz, psEnc->sCmn.pitchEstimationComplexity, psEnc->sCmn.nb_subfr ) == 0 )
120         {
121             psEnc->sCmn.indices.signalType = TYPE_VOICED;
122         } else {
123             psEnc->sCmn.indices.signalType = TYPE_UNVOICED;
124         }
125     } else {
126         silk_memset( psEncCtrl->pitchL, 0, sizeof( psEncCtrl->pitchL ) );
127         psEnc->sCmn.indices.lagIndex = 0;
128         psEnc->sCmn.indices.contourIndex = 0;
129         psEnc->LTPCorr = 0;
130     }
131 }