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27 
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31 
32 #include "main_FIX.h"
33 #include "tuning_parameters.h"
34 
silk_find_LTP_FIX(opus_int32 XXLTP_Q17[MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER],opus_int32 xXLTP_Q17[MAX_NB_SUBFR * LTP_ORDER],const opus_int16 r_ptr[],const opus_int lag[MAX_NB_SUBFR],const opus_int subfr_length,const opus_int nb_subfr,int arch)35 void silk_find_LTP_FIX(
36     opus_int32                      XXLTP_Q17[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O    Correlation matrix                                               */
37     opus_int32                      xXLTP_Q17[ MAX_NB_SUBFR * LTP_ORDER ],  /* O    Correlation vector                                                          */
38     const opus_int16                r_ptr[],                                /* I    Residual signal after LPC                                                   */
39     const opus_int                  lag[ MAX_NB_SUBFR ],                    /* I    LTP lags                                                                    */
40     const opus_int                  subfr_length,                           /* I    Subframe length                                                             */
41     const opus_int                  nb_subfr,                               /* I    Number of subframes                                                         */
42     int                             arch                                    /* I    Run-time architecture                                                       */
43 )
44 {
45     opus_int   i, k, extra_shifts;
46     opus_int   xx_shifts, xX_shifts, XX_shifts;
47     const opus_int16 *lag_ptr;
48     opus_int32 *XXLTP_Q17_ptr, *xXLTP_Q17_ptr;
49     opus_int32 xx, nrg, temp;
50 
51     xXLTP_Q17_ptr = xXLTP_Q17;
52     XXLTP_Q17_ptr = XXLTP_Q17;
53     for( k = 0; k < nb_subfr; k++ ) {
54         lag_ptr = r_ptr - ( lag[ k ] + LTP_ORDER / 2 );
55 
56         silk_sum_sqr_shift( &xx, &xx_shifts, r_ptr, subfr_length + LTP_ORDER );                            /* xx in Q( -xx_shifts ) */
57         silk_corrMatrix_FIX( lag_ptr, subfr_length, LTP_ORDER, XXLTP_Q17_ptr, &nrg, &XX_shifts, arch );    /* XXLTP_Q17_ptr and nrg in Q( -XX_shifts ) */
58         extra_shifts = xx_shifts - XX_shifts;
59         if( extra_shifts > 0 ) {
60             /* Shift XX */
61             xX_shifts = xx_shifts;
62             for( i = 0; i < LTP_ORDER * LTP_ORDER; i++ ) {
63                 XXLTP_Q17_ptr[ i ] = silk_RSHIFT32( XXLTP_Q17_ptr[ i ], extra_shifts );              /* Q( -xX_shifts ) */
64             }
65             nrg = silk_RSHIFT32( nrg, extra_shifts );                                                /* Q( -xX_shifts ) */
66         } else if( extra_shifts < 0 ) {
67             /* Shift xx */
68             xX_shifts = XX_shifts;
69             xx = silk_RSHIFT32( xx, -extra_shifts );                                                 /* Q( -xX_shifts ) */
70         } else {
71             xX_shifts = xx_shifts;
72         }
73         silk_corrVector_FIX( lag_ptr, r_ptr, subfr_length, LTP_ORDER, xXLTP_Q17_ptr, xX_shifts, arch );    /* xXLTP_Q17_ptr in Q( -xX_shifts ) */
74 
75         /* At this point all correlations are in Q(-xX_shifts) */
76         temp = silk_SMLAWB( 1, nrg, SILK_FIX_CONST( LTP_CORR_INV_MAX, 16 ) );
77         temp = silk_max( temp, xx );
78 TIC(div)
79 #if 0
80         for( i = 0; i < LTP_ORDER * LTP_ORDER; i++ ) {
81             XXLTP_Q17_ptr[ i ] = silk_DIV32_varQ( XXLTP_Q17_ptr[ i ], temp, 17 );
82         }
83         for( i = 0; i < LTP_ORDER; i++ ) {
84             xXLTP_Q17_ptr[ i ] = silk_DIV32_varQ( xXLTP_Q17_ptr[ i ], temp, 17 );
85         }
86 #else
87         for( i = 0; i < LTP_ORDER * LTP_ORDER; i++ ) {
88             XXLTP_Q17_ptr[ i ] = (opus_int32)( silk_LSHIFT64( (opus_int64)XXLTP_Q17_ptr[ i ], 17 ) / temp );
89         }
90         for( i = 0; i < LTP_ORDER; i++ ) {
91             xXLTP_Q17_ptr[ i ] = (opus_int32)( silk_LSHIFT64( (opus_int64)xXLTP_Q17_ptr[ i ], 17 ) / temp );
92         }
93 #endif
94 TOC(div)
95         r_ptr         += subfr_length;
96         XXLTP_Q17_ptr += LTP_ORDER * LTP_ORDER;
97         xXLTP_Q17_ptr += LTP_ORDER;
98     }
99 }
100