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Diffstat (limited to 'lib/rbcodec/codecs/libopus/silk/fixed/find_LTP_FIX.c')
-rw-r--r-- | lib/rbcodec/codecs/libopus/silk/fixed/find_LTP_FIX.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libopus/silk/fixed/find_LTP_FIX.c b/lib/rbcodec/codecs/libopus/silk/fixed/find_LTP_FIX.c new file mode 100644 index 0000000000..62d4afb250 --- /dev/null +++ b/lib/rbcodec/codecs/libopus/silk/fixed/find_LTP_FIX.c | |||
@@ -0,0 +1,99 @@ | |||
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 | |||
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 | } | ||