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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 );
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 
98         /* Control LTP scaling */
99         silk_LTP_scale_ctrl_FIX( psEnc, psEncCtrl, condCoding );
100 
101         /* Create LTP residual */
102         silk_LTP_analysis_filter_FIX( LPC_in_pre, x - psEnc->sCmn.predictLPCOrder, psEncCtrl->LTPCoef_Q14,
103             psEncCtrl->pitchL, invGains_Q16, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );
104 
105     } else {
106         /************/
107         /* UNVOICED */
108         /************/
109         /* Create signal with prepended subframes, scaled by inverse gains */
110         x_ptr     = x - psEnc->sCmn.predictLPCOrder;
111         x_pre_ptr = LPC_in_pre;
112         for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
113             silk_scale_copy_vector16( x_pre_ptr, x_ptr, invGains_Q16[ i ],
114                 psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder );
115             x_pre_ptr += psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder;
116             x_ptr     += psEnc->sCmn.subfr_length;
117         }
118 
119         silk_memset( psEncCtrl->LTPCoef_Q14, 0, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( opus_int16 ) );
120         psEncCtrl->LTPredCodGain_Q7 = 0;
121 		psEnc->sCmn.sum_log_gain_Q7 = 0;
122     }
123 
124     /* Limit on total predictive coding gain */
125     if( psEnc->sCmn.first_frame_after_reset ) {
126         minInvGain_Q30 = SILK_FIX_CONST( 1.0f / MAX_PREDICTION_POWER_GAIN_AFTER_RESET, 30 );
127     } else {
128         minInvGain_Q30 = silk_log2lin( silk_SMLAWB( 16 << 7, (opus_int32)psEncCtrl->LTPredCodGain_Q7, SILK_FIX_CONST( 1.0 / 3, 16 ) ) );      /* Q16 */
129         minInvGain_Q30 = silk_DIV32_varQ( minInvGain_Q30,
130             silk_SMULWW( SILK_FIX_CONST( MAX_PREDICTION_POWER_GAIN, 0 ),
131                 silk_SMLAWB( SILK_FIX_CONST( 0.25, 18 ), SILK_FIX_CONST( 0.75, 18 ), psEncCtrl->coding_quality_Q14 ) ), 14 );
132     }
133 
134     /* LPC_in_pre contains the LTP-filtered input for voiced, and the unfiltered input for unvoiced */
135     silk_find_LPC_FIX( &psEnc->sCmn, NLSF_Q15, LPC_in_pre, minInvGain_Q30 );
136 
137     /* Quantize LSFs */
138     silk_process_NLSFs( &psEnc->sCmn, psEncCtrl->PredCoef_Q12, NLSF_Q15, psEnc->sCmn.prev_NLSFq_Q15 );
139 
140     /* Calculate residual energy using quantized LPC coefficients */
141     silk_residual_energy_FIX( psEncCtrl->ResNrg, psEncCtrl->ResNrgQ, LPC_in_pre, psEncCtrl->PredCoef_Q12, local_gains,
142         psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );
143 
144     /* Copy to prediction struct for use in next frame for interpolation */
145     silk_memcpy( psEnc->sCmn.prev_NLSFq_Q15, NLSF_Q15, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) );
146     RESTORE_STACK;
147 }
148