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1/***********************************************************************
2Copyright (c) 2006-2011, Skype Limited. All rights reserved.
3Redistribution and use in source and binary forms, with or without
4modification, are permitted provided that the following conditions
5are met:
6- Redistributions of source code must retain the above copyright notice,
7this list of conditions and the following disclaimer.
8- Redistributions in binary form must reproduce the above copyright
9notice, this list of conditions and the following disclaimer in the
10documentation and/or other materials provided with the distribution.
11- Neither the name of Internet Society, IETF or IETF Trust, nor the
12names of specific contributors, may be used to endorse or promote
13products derived from this software without specific prior written
14permission.
15THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
19LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25POSSIBILITY 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 */
35void 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 for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
54 silk_assert( psEncCtrl->Gains[ i ] > 0.0f );
55 invGains[ i ] = 1.0f / psEncCtrl->Gains[ i ];
56 }
57
58 if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
59 /**********/
60 /* VOICED */
61 /**********/
62 celt_assert( psEnc->sCmn.ltp_mem_length - psEnc->sCmn.predictLPCOrder >= psEncCtrl->pitchL[ 0 ] + LTP_ORDER / 2 );
63
64 /* LTP analysis */
65 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 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 silk_LTP_scale_ctrl_FLP( psEnc, psEncCtrl, condCoding );
73
74 /* Create LTP residual */
75 silk_LTP_analysis_filter_FLP( LPC_in_pre, x - psEnc->sCmn.predictLPCOrder, psEncCtrl->LTPCoef,
76 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 x_ptr = x - psEnc->sCmn.predictLPCOrder;
83 x_pre_ptr = LPC_in_pre;
84 for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
85 silk_scale_copy_vector_FLP( x_pre_ptr, x_ptr, invGains[ i ],
86 psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder );
87 x_pre_ptr += psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder;
88 x_ptr += psEnc->sCmn.subfr_length;
89 }
90 silk_memset( psEncCtrl->LTPCoef, 0, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( silk_float ) );
91 psEncCtrl->LTPredCodGain = 0.0f;
92 psEnc->sCmn.sum_log_gain_Q7 = 0;
93 }
94
95 /* Limit on total predictive coding gain */
96 if( psEnc->sCmn.first_frame_after_reset ) {
97 minInvGain = 1.0f / MAX_PREDICTION_POWER_GAIN_AFTER_RESET;
98 } else {
99 minInvGain = (silk_float)pow( 2, psEncCtrl->LTPredCodGain / 3 ) / MAX_PREDICTION_POWER_GAIN;
100 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 silk_find_LPC_FLP( &psEnc->sCmn, NLSF_Q15, LPC_in_pre, minInvGain );
105
106 /* Quantize LSFs */
107 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 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 silk_memcpy( psEnc->sCmn.prev_NLSFq_Q15, NLSF_Q15, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) );
115}
116
generated by cgit v1.2.3 (git 2.39.1) at 2024-08-20 10:29:03 +0000