• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 /***********************************************************************
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
10 documentation and/or other materials provided with the distribution.
11 - Neither the name of Internet Society, IETF or IETF Trust, nor the
12 names of specific contributors, may be used to endorse or promote
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 "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