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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
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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
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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_FLP.h"
33
34 /* Find LPC and LTP coefficients */
silk_find_pred_coefs_FLP(silk_encoder_state_FLP * psEnc,silk_encoder_control_FLP * psEncCtrl,const silk_float res_pitch[],const silk_float x[],opus_int condCoding)35 void silk_find_pred_coefs_FLP(
36 silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
37 silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
38 const silk_float res_pitch[], /* I Residual from pitch analysis */
39 const silk_float x[], /* I Speech signal */
40 opus_int condCoding /* I The type of conditional coding to use */
41 )
42 {
43 opus_int i;
44 silk_float WLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ];
45 silk_float invGains[ MAX_NB_SUBFR ], Wght[ MAX_NB_SUBFR ];
46 opus_int16 NLSF_Q15[ MAX_LPC_ORDER ];
47 const silk_float *x_ptr;
48 silk_float *x_pre_ptr, LPC_in_pre[ MAX_NB_SUBFR * MAX_LPC_ORDER + MAX_FRAME_LENGTH ];
49 silk_float minInvGain;
50
51 /* Weighting for weighted least squares */
52 for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
53 silk_assert( psEncCtrl->Gains[ i ] > 0.0f );
54 invGains[ i ] = 1.0f / psEncCtrl->Gains[ i ];
55 Wght[ i ] = invGains[ i ] * invGains[ i ];
56 }
57
58 if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
59 /**********/
60 /* VOICED */
61 /**********/
62 silk_assert( psEnc->sCmn.ltp_mem_length - psEnc->sCmn.predictLPCOrder >= psEncCtrl->pitchL[ 0 ] + LTP_ORDER / 2 );
63
64 /* LTP analysis */
65 silk_find_LTP_FLP( psEncCtrl->LTPCoef, WLTP, &psEncCtrl->LTPredCodGain, res_pitch,
66 psEncCtrl->pitchL, Wght, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.ltp_mem_length );
67
68 /* Quantize LTP gain parameters */
69 silk_quant_LTP_gains_FLP( psEncCtrl->LTPCoef, psEnc->sCmn.indices.LTPIndex, &psEnc->sCmn.indices.PERIndex,
70 &psEnc->sCmn.sum_log_gain_Q7, WLTP, psEnc->sCmn.mu_LTP_Q9, psEnc->sCmn.LTPQuantLowComplexity, psEnc->sCmn.nb_subfr,
71 psEnc->sCmn.arch );
72
73 /* Control LTP scaling */
74 silk_LTP_scale_ctrl_FLP( psEnc, psEncCtrl, condCoding );
75
76 /* Create LTP residual */
77 silk_LTP_analysis_filter_FLP( LPC_in_pre, x - psEnc->sCmn.predictLPCOrder, psEncCtrl->LTPCoef,
78 psEncCtrl->pitchL, invGains, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );
79 } else {
80 /************/
81 /* UNVOICED */
82 /************/
83 /* Create signal with prepended subframes, scaled by inverse gains */
84 x_ptr = x - psEnc->sCmn.predictLPCOrder;
85 x_pre_ptr = LPC_in_pre;
86 for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
87 silk_scale_copy_vector_FLP( x_pre_ptr, x_ptr, invGains[ i ],
88 psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder );
89 x_pre_ptr += psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder;
90 x_ptr += psEnc->sCmn.subfr_length;
91 }
92 silk_memset( psEncCtrl->LTPCoef, 0, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( silk_float ) );
93 psEncCtrl->LTPredCodGain = 0.0f;
94 psEnc->sCmn.sum_log_gain_Q7 = 0;
95 }
96
97 /* Limit on total predictive coding gain */
98 if( psEnc->sCmn.first_frame_after_reset ) {
99 minInvGain = 1.0f / MAX_PREDICTION_POWER_GAIN_AFTER_RESET;
100 } else {
101 minInvGain = (silk_float)pow( 2, psEncCtrl->LTPredCodGain / 3 ) / MAX_PREDICTION_POWER_GAIN;
102 minInvGain /= 0.25f + 0.75f * psEncCtrl->coding_quality;
103 }
104
105 /* LPC_in_pre contains the LTP-filtered input for voiced, and the unfiltered input for unvoiced */
106 silk_find_LPC_FLP( &psEnc->sCmn, NLSF_Q15, LPC_in_pre, minInvGain );
107
108 /* Quantize LSFs */
109 silk_process_NLSFs_FLP( &psEnc->sCmn, psEncCtrl->PredCoef, NLSF_Q15, psEnc->sCmn.prev_NLSFq_Q15 );
110
111 /* Calculate residual energy using quantized LPC coefficients */
112 silk_residual_energy_FLP( psEncCtrl->ResNrg, LPC_in_pre, psEncCtrl->PredCoef, psEncCtrl->Gains,
113 psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );
114
115 /* Copy to prediction struct for use in next frame for interpolation */
116 silk_memcpy( psEnc->sCmn.prev_NLSFq_Q15, NLSF_Q15, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) );
117 }
118
119