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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
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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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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.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 );
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 );
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