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Diffstat (limited to 'lib/rbcodec/codecs/libopus/silk/float/LTP_analysis_filter_FLP.c')
-rw-r--r-- | lib/rbcodec/codecs/libopus/silk/float/LTP_analysis_filter_FLP.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libopus/silk/float/LTP_analysis_filter_FLP.c b/lib/rbcodec/codecs/libopus/silk/float/LTP_analysis_filter_FLP.c new file mode 100644 index 0000000000..849b7c1c52 --- /dev/null +++ b/lib/rbcodec/codecs/libopus/silk/float/LTP_analysis_filter_FLP.c | |||
@@ -0,0 +1,75 @@ | |||
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_FLP.h" | ||
33 | |||
34 | void silk_LTP_analysis_filter_FLP( | ||
35 | silk_float *LTP_res, /* O LTP res MAX_NB_SUBFR*(pre_lgth+subfr_lngth) */ | ||
36 | const silk_float *x, /* I Input signal, with preceding samples */ | ||
37 | const silk_float B[ LTP_ORDER * MAX_NB_SUBFR ], /* I LTP coefficients for each subframe */ | ||
38 | const opus_int pitchL[ MAX_NB_SUBFR ], /* I Pitch lags */ | ||
39 | const silk_float invGains[ MAX_NB_SUBFR ], /* I Inverse quantization gains */ | ||
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 Preceding samples for each subframe */ | ||
43 | ) | ||
44 | { | ||
45 | const silk_float *x_ptr, *x_lag_ptr; | ||
46 | silk_float Btmp[ LTP_ORDER ]; | ||
47 | silk_float *LTP_res_ptr; | ||
48 | silk_float inv_gain; | ||
49 | opus_int k, i, j; | ||
50 | |||
51 | x_ptr = x; | ||
52 | LTP_res_ptr = LTP_res; | ||
53 | for( k = 0; k < nb_subfr; k++ ) { | ||
54 | x_lag_ptr = x_ptr - pitchL[ k ]; | ||
55 | inv_gain = invGains[ k ]; | ||
56 | for( i = 0; i < LTP_ORDER; i++ ) { | ||
57 | Btmp[ i ] = B[ k * LTP_ORDER + i ]; | ||
58 | } | ||
59 | |||
60 | /* LTP analysis FIR filter */ | ||
61 | for( i = 0; i < subfr_length + pre_length; i++ ) { | ||
62 | LTP_res_ptr[ i ] = x_ptr[ i ]; | ||
63 | /* Subtract long-term prediction */ | ||
64 | for( j = 0; j < LTP_ORDER; j++ ) { | ||
65 | LTP_res_ptr[ i ] -= Btmp[ j ] * x_lag_ptr[ LTP_ORDER / 2 - j ]; | ||
66 | } | ||
67 | LTP_res_ptr[ i ] *= inv_gain; | ||
68 | x_lag_ptr++; | ||
69 | } | ||
70 | |||
71 | /* Update pointers */ | ||
72 | LTP_res_ptr += subfr_length + pre_length; | ||
73 | x_ptr += subfr_length; | ||
74 | } | ||
75 | } | ||