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