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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