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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
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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
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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
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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 "main.h"
33
34 /* Limit, stabilize, convert and quantize NLSFs */
silk_process_NLSFs(silk_encoder_state * psEncC,opus_int16 PredCoef_Q12[2][MAX_LPC_ORDER],opus_int16 pNLSF_Q15[MAX_LPC_ORDER],const opus_int16 prev_NLSFq_Q15[MAX_LPC_ORDER])35 void silk_process_NLSFs(
36 silk_encoder_state *psEncC, /* I/O Encoder state */
37 opus_int16 PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ], /* O Prediction coefficients */
38 opus_int16 pNLSF_Q15[ MAX_LPC_ORDER ], /* I/O Normalized LSFs (quant out) (0 - (2^15-1)) */
39 const opus_int16 prev_NLSFq_Q15[ MAX_LPC_ORDER ] /* I Previous Normalized LSFs (0 - (2^15-1)) */
40 )
41 {
42 opus_int i, doInterpolate;
43 opus_int NLSF_mu_Q20;
44 opus_int16 i_sqr_Q15;
45 opus_int16 pNLSF0_temp_Q15[ MAX_LPC_ORDER ];
46 opus_int16 pNLSFW_QW[ MAX_LPC_ORDER ];
47 opus_int16 pNLSFW0_temp_QW[ MAX_LPC_ORDER ];
48
49 silk_assert( psEncC->speech_activity_Q8 >= 0 );
50 silk_assert( psEncC->speech_activity_Q8 <= SILK_FIX_CONST( 1.0, 8 ) );
51 silk_assert( psEncC->useInterpolatedNLSFs == 1 || psEncC->indices.NLSFInterpCoef_Q2 == ( 1 << 2 ) );
52
53 /***********************/
54 /* Calculate mu values */
55 /***********************/
56 /* NLSF_mu = 0.003 - 0.0015 * psEnc->speech_activity; */
57 NLSF_mu_Q20 = silk_SMLAWB( SILK_FIX_CONST( 0.003, 20 ), SILK_FIX_CONST( -0.001, 28 ), psEncC->speech_activity_Q8 );
58 if( psEncC->nb_subfr == 2 ) {
59 /* Multiply by 1.5 for 10 ms packets */
60 NLSF_mu_Q20 = silk_ADD_RSHIFT( NLSF_mu_Q20, NLSF_mu_Q20, 1 );
61 }
62
63 silk_assert( NLSF_mu_Q20 > 0 );
64 silk_assert( NLSF_mu_Q20 <= SILK_FIX_CONST( 0.005, 20 ) );
65
66 /* Calculate NLSF weights */
67 silk_NLSF_VQ_weights_laroia( pNLSFW_QW, pNLSF_Q15, psEncC->predictLPCOrder );
68
69 /* Update NLSF weights for interpolated NLSFs */
70 doInterpolate = ( psEncC->useInterpolatedNLSFs == 1 ) && ( psEncC->indices.NLSFInterpCoef_Q2 < 4 );
71 if( doInterpolate ) {
72 /* Calculate the interpolated NLSF vector for the first half */
73 silk_interpolate( pNLSF0_temp_Q15, prev_NLSFq_Q15, pNLSF_Q15,
74 psEncC->indices.NLSFInterpCoef_Q2, psEncC->predictLPCOrder );
75
76 /* Calculate first half NLSF weights for the interpolated NLSFs */
77 silk_NLSF_VQ_weights_laroia( pNLSFW0_temp_QW, pNLSF0_temp_Q15, psEncC->predictLPCOrder );
78
79 /* Update NLSF weights with contribution from first half */
80 i_sqr_Q15 = silk_LSHIFT( silk_SMULBB( psEncC->indices.NLSFInterpCoef_Q2, psEncC->indices.NLSFInterpCoef_Q2 ), 11 );
81 for( i = 0; i < psEncC->predictLPCOrder; i++ ) {
82 pNLSFW_QW[ i ] = silk_ADD16( silk_RSHIFT( pNLSFW_QW[ i ], 1 ), silk_RSHIFT(
83 silk_SMULBB( pNLSFW0_temp_QW[ i ], i_sqr_Q15 ), 16) );
84 silk_assert( pNLSFW_QW[ i ] >= 1 );
85 }
86 }
87
88 silk_NLSF_encode( psEncC->indices.NLSFIndices, pNLSF_Q15, psEncC->psNLSF_CB, pNLSFW_QW,
89 NLSF_mu_Q20, psEncC->NLSF_MSVQ_Survivors, psEncC->indices.signalType );
90
91 /* Convert quantized NLSFs back to LPC coefficients */
92 silk_NLSF2A( PredCoef_Q12[ 1 ], pNLSF_Q15, psEncC->predictLPCOrder, psEncC->arch );
93
94 if( doInterpolate ) {
95 /* Calculate the interpolated, quantized LSF vector for the first half */
96 silk_interpolate( pNLSF0_temp_Q15, prev_NLSFq_Q15, pNLSF_Q15,
97 psEncC->indices.NLSFInterpCoef_Q2, psEncC->predictLPCOrder );
98
99 /* Convert back to LPC coefficients */
100 silk_NLSF2A( PredCoef_Q12[ 0 ], pNLSF0_temp_Q15, psEncC->predictLPCOrder, psEncC->arch );
101
102 } else {
103 /* Copy LPC coefficients for first half from second half */
104 silk_assert( psEncC->predictLPCOrder <= MAX_LPC_ORDER );
105 silk_memcpy( PredCoef_Q12[ 0 ], PredCoef_Q12[ 1 ], psEncC->predictLPCOrder * sizeof( opus_int16 ) );
106 }
107 }
108