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4 modification, are permitted provided that the following conditions
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8 - Redistributions in binary form must reproduce the above copyright
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11 - Neither the name of Internet Society, IETF or IETF Trust, nor the
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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
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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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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 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
117