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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
9 notice, this list of conditions and the following disclaimer in the
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11 - Neither the name of Internet Society, IETF or IETF Trust, nor the
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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_FIX.h"
33 #include "stack_alloc.h"
34
silk_find_pred_coefs_FIX(silk_encoder_state_FIX * psEnc,silk_encoder_control_FIX * psEncCtrl,const opus_int16 res_pitch[],const opus_int16 x[],opus_int condCoding)35 void silk_find_pred_coefs_FIX(
36 silk_encoder_state_FIX *psEnc, /* I/O encoder state */
37 silk_encoder_control_FIX *psEncCtrl, /* I/O encoder control */
38 const opus_int16 res_pitch[], /* I Residual from pitch analysis */
39 const opus_int16 x[], /* I Speech signal */
40 opus_int condCoding /* I The type of conditional coding to use */
41 )
42 {
43 opus_int i;
44 opus_int32 invGains_Q16[ MAX_NB_SUBFR ], local_gains[ MAX_NB_SUBFR ], Wght_Q15[ MAX_NB_SUBFR ];
45 opus_int16 NLSF_Q15[ MAX_LPC_ORDER ];
46 const opus_int16 *x_ptr;
47 opus_int16 *x_pre_ptr;
48 VARDECL( opus_int16, LPC_in_pre );
49 opus_int32 tmp, min_gain_Q16, minInvGain_Q30;
50 opus_int LTP_corrs_rshift[ MAX_NB_SUBFR ];
51 SAVE_STACK;
52
53 /* weighting for weighted least squares */
54 min_gain_Q16 = silk_int32_MAX >> 6;
55 for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
56 min_gain_Q16 = silk_min( min_gain_Q16, psEncCtrl->Gains_Q16[ i ] );
57 }
58 for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
59 /* Divide to Q16 */
60 silk_assert( psEncCtrl->Gains_Q16[ i ] > 0 );
61 /* Invert and normalize gains, and ensure that maximum invGains_Q16 is within range of a 16 bit int */
62 invGains_Q16[ i ] = silk_DIV32_varQ( min_gain_Q16, psEncCtrl->Gains_Q16[ i ], 16 - 2 );
63
64 /* Ensure Wght_Q15 a minimum value 1 */
65 invGains_Q16[ i ] = silk_max( invGains_Q16[ i ], 363 );
66
67 /* Square the inverted gains */
68 silk_assert( invGains_Q16[ i ] == silk_SAT16( invGains_Q16[ i ] ) );
69 tmp = silk_SMULWB( invGains_Q16[ i ], invGains_Q16[ i ] );
70 Wght_Q15[ i ] = silk_RSHIFT( tmp, 1 );
71
72 /* Invert the inverted and normalized gains */
73 local_gains[ i ] = silk_DIV32( ( (opus_int32)1 << 16 ), invGains_Q16[ i ] );
74 }
75
76 ALLOC( LPC_in_pre,
77 psEnc->sCmn.nb_subfr * psEnc->sCmn.predictLPCOrder
78 + psEnc->sCmn.frame_length, opus_int16 );
79 if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
80 VARDECL( opus_int32, WLTP );
81
82 /**********/
83 /* VOICED */
84 /**********/
85 silk_assert( psEnc->sCmn.ltp_mem_length - psEnc->sCmn.predictLPCOrder >= psEncCtrl->pitchL[ 0 ] + LTP_ORDER / 2 );
86
87 ALLOC( WLTP, psEnc->sCmn.nb_subfr * LTP_ORDER * LTP_ORDER, opus_int32 );
88
89 /* LTP analysis */
90 silk_find_LTP_FIX( psEncCtrl->LTPCoef_Q14, WLTP, &psEncCtrl->LTPredCodGain_Q7,
91 res_pitch, psEncCtrl->pitchL, Wght_Q15, psEnc->sCmn.subfr_length,
92 psEnc->sCmn.nb_subfr, psEnc->sCmn.ltp_mem_length, LTP_corrs_rshift, psEnc->sCmn.arch );
93
94 /* Quantize LTP gain parameters */
95 silk_quant_LTP_gains( psEncCtrl->LTPCoef_Q14, psEnc->sCmn.indices.LTPIndex, &psEnc->sCmn.indices.PERIndex,
96 &psEnc->sCmn.sum_log_gain_Q7, WLTP, psEnc->sCmn.mu_LTP_Q9, psEnc->sCmn.LTPQuantLowComplexity, psEnc->sCmn.nb_subfr,
97 psEnc->sCmn.arch);
98
99 /* Control LTP scaling */
100 silk_LTP_scale_ctrl_FIX( psEnc, psEncCtrl, condCoding );
101
102 /* Create LTP residual */
103 silk_LTP_analysis_filter_FIX( LPC_in_pre, x - psEnc->sCmn.predictLPCOrder, psEncCtrl->LTPCoef_Q14,
104 psEncCtrl->pitchL, invGains_Q16, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );
105
106 } else {
107 /************/
108 /* UNVOICED */
109 /************/
110 /* Create signal with prepended subframes, scaled by inverse gains */
111 x_ptr = x - psEnc->sCmn.predictLPCOrder;
112 x_pre_ptr = LPC_in_pre;
113 for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
114 silk_scale_copy_vector16( x_pre_ptr, x_ptr, invGains_Q16[ i ],
115 psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder );
116 x_pre_ptr += psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder;
117 x_ptr += psEnc->sCmn.subfr_length;
118 }
119
120 silk_memset( psEncCtrl->LTPCoef_Q14, 0, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( opus_int16 ) );
121 psEncCtrl->LTPredCodGain_Q7 = 0;
122 psEnc->sCmn.sum_log_gain_Q7 = 0;
123 }
124
125 /* Limit on total predictive coding gain */
126 if( psEnc->sCmn.first_frame_after_reset ) {
127 minInvGain_Q30 = SILK_FIX_CONST( 1.0f / MAX_PREDICTION_POWER_GAIN_AFTER_RESET, 30 );
128 } else {
129 minInvGain_Q30 = silk_log2lin( silk_SMLAWB( 16 << 7, (opus_int32)psEncCtrl->LTPredCodGain_Q7, SILK_FIX_CONST( 1.0 / 3, 16 ) ) ); /* Q16 */
130 minInvGain_Q30 = silk_DIV32_varQ( minInvGain_Q30,
131 silk_SMULWW( SILK_FIX_CONST( MAX_PREDICTION_POWER_GAIN, 0 ),
132 silk_SMLAWB( SILK_FIX_CONST( 0.25, 18 ), SILK_FIX_CONST( 0.75, 18 ), psEncCtrl->coding_quality_Q14 ) ), 14 );
133 }
134
135 /* LPC_in_pre contains the LTP-filtered input for voiced, and the unfiltered input for unvoiced */
136 silk_find_LPC_FIX( &psEnc->sCmn, NLSF_Q15, LPC_in_pre, minInvGain_Q30 );
137
138 /* Quantize LSFs */
139 silk_process_NLSFs( &psEnc->sCmn, psEncCtrl->PredCoef_Q12, NLSF_Q15, psEnc->sCmn.prev_NLSFq_Q15 );
140
141 /* Calculate residual energy using quantized LPC coefficients */
142 silk_residual_energy_FIX( psEncCtrl->ResNrg, psEncCtrl->ResNrgQ, LPC_in_pre, psEncCtrl->PredCoef_Q12, local_gains,
143 psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder, psEnc->sCmn.arch );
144
145 /* Copy to prediction struct for use in next frame for interpolation */
146 silk_memcpy( psEnc->sCmn.prev_NLSFq_Q15, NLSF_Q15, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) );
147 RESTORE_STACK;
148 }
149