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Diffstat (limited to 'lib/rbcodec/codecs/libopus/silk/fixed/LTP_analysis_filter_FIX.c')
-rw-r--r-- | lib/rbcodec/codecs/libopus/silk/fixed/LTP_analysis_filter_FIX.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libopus/silk/fixed/LTP_analysis_filter_FIX.c b/lib/rbcodec/codecs/libopus/silk/fixed/LTP_analysis_filter_FIX.c new file mode 100644 index 0000000000..5574e7069f --- /dev/null +++ b/lib/rbcodec/codecs/libopus/silk/fixed/LTP_analysis_filter_FIX.c | |||
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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 | |||
34 | void silk_LTP_analysis_filter_FIX( | ||
35 | opus_int16 *LTP_res, /* O LTP residual signal of length MAX_NB_SUBFR * ( pre_length + subfr_length ) */ | ||
36 | const opus_int16 *x, /* I Pointer to input signal with at least max( pitchL ) preceding samples */ | ||
37 | const opus_int16 LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ],/* I LTP_ORDER LTP coefficients for each MAX_NB_SUBFR subframe */ | ||
38 | const opus_int pitchL[ MAX_NB_SUBFR ], /* I Pitch lag, one for each subframe */ | ||
39 | const opus_int32 invGains_Q16[ MAX_NB_SUBFR ], /* I Inverse quantization gains, one for each subframe */ | ||
40 | const opus_int subfr_length, /* I Length of each subframe */ | ||
41 | const opus_int nb_subfr, /* I Number of subframes */ | ||
42 | const opus_int pre_length /* I Length of the preceding samples starting at &x[0] for each subframe */ | ||
43 | ) | ||
44 | { | ||
45 | const opus_int16 *x_ptr, *x_lag_ptr; | ||
46 | opus_int16 Btmp_Q14[ LTP_ORDER ]; | ||
47 | opus_int16 *LTP_res_ptr; | ||
48 | opus_int k, i; | ||
49 | opus_int32 LTP_est; | ||
50 | |||
51 | x_ptr = x; | ||
52 | LTP_res_ptr = LTP_res; | ||
53 | for( k = 0; k < nb_subfr; k++ ) { | ||
54 | |||
55 | x_lag_ptr = x_ptr - pitchL[ k ]; | ||
56 | |||
57 | Btmp_Q14[ 0 ] = LTPCoef_Q14[ k * LTP_ORDER ]; | ||
58 | Btmp_Q14[ 1 ] = LTPCoef_Q14[ k * LTP_ORDER + 1 ]; | ||
59 | Btmp_Q14[ 2 ] = LTPCoef_Q14[ k * LTP_ORDER + 2 ]; | ||
60 | Btmp_Q14[ 3 ] = LTPCoef_Q14[ k * LTP_ORDER + 3 ]; | ||
61 | Btmp_Q14[ 4 ] = LTPCoef_Q14[ k * LTP_ORDER + 4 ]; | ||
62 | |||
63 | /* LTP analysis FIR filter */ | ||
64 | for( i = 0; i < subfr_length + pre_length; i++ ) { | ||
65 | LTP_res_ptr[ i ] = x_ptr[ i ]; | ||
66 | |||
67 | /* Long-term prediction */ | ||
68 | LTP_est = silk_SMULBB( x_lag_ptr[ LTP_ORDER / 2 ], Btmp_Q14[ 0 ] ); | ||
69 | LTP_est = silk_SMLABB_ovflw( LTP_est, x_lag_ptr[ 1 ], Btmp_Q14[ 1 ] ); | ||
70 | LTP_est = silk_SMLABB_ovflw( LTP_est, x_lag_ptr[ 0 ], Btmp_Q14[ 2 ] ); | ||
71 | LTP_est = silk_SMLABB_ovflw( LTP_est, x_lag_ptr[ -1 ], Btmp_Q14[ 3 ] ); | ||
72 | LTP_est = silk_SMLABB_ovflw( LTP_est, x_lag_ptr[ -2 ], Btmp_Q14[ 4 ] ); | ||
73 | |||
74 | LTP_est = silk_RSHIFT_ROUND( LTP_est, 14 ); /* round and -> Q0*/ | ||
75 | |||
76 | /* Subtract long-term prediction */ | ||
77 | LTP_res_ptr[ i ] = (opus_int16)silk_SAT16( (opus_int32)x_ptr[ i ] - LTP_est ); | ||
78 | |||
79 | /* Scale residual */ | ||
80 | LTP_res_ptr[ i ] = silk_SMULWB( invGains_Q16[ k ], LTP_res_ptr[ i ] ); | ||
81 | |||
82 | x_lag_ptr++; | ||
83 | } | ||
84 | |||
85 | /* Update pointers */ | ||
86 | LTP_res_ptr += subfr_length + pre_length; | ||
87 | x_ptr += subfr_length; | ||
88 | } | ||
89 | } | ||
90 | |||