diff options
Diffstat (limited to 'lib/rbcodec/codecs/libopus/silk/float/warped_autocorrelation_FLP.c')
-rw-r--r-- | lib/rbcodec/codecs/libopus/silk/float/warped_autocorrelation_FLP.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libopus/silk/float/warped_autocorrelation_FLP.c b/lib/rbcodec/codecs/libopus/silk/float/warped_autocorrelation_FLP.c new file mode 100644 index 0000000000..09186e73d4 --- /dev/null +++ b/lib/rbcodec/codecs/libopus/silk/float/warped_autocorrelation_FLP.c | |||
@@ -0,0 +1,73 @@ | |||
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 | /* Autocorrelations for a warped frequency axis */ | ||
35 | void silk_warped_autocorrelation_FLP( | ||
36 | silk_float *corr, /* O Result [order + 1] */ | ||
37 | const silk_float *input, /* I Input data to correlate */ | ||
38 | const silk_float warping, /* I Warping coefficient */ | ||
39 | const opus_int length, /* I Length of input */ | ||
40 | const opus_int order /* I Correlation order (even) */ | ||
41 | ) | ||
42 | { | ||
43 | opus_int n, i; | ||
44 | double tmp1, tmp2; | ||
45 | double state[ MAX_SHAPE_LPC_ORDER + 1 ] = { 0 }; | ||
46 | double C[ MAX_SHAPE_LPC_ORDER + 1 ] = { 0 }; | ||
47 | |||
48 | /* Order must be even */ | ||
49 | celt_assert( ( order & 1 ) == 0 ); | ||
50 | |||
51 | /* Loop over samples */ | ||
52 | for( n = 0; n < length; n++ ) { | ||
53 | tmp1 = input[ n ]; | ||
54 | /* Loop over allpass sections */ | ||
55 | for( i = 0; i < order; i += 2 ) { | ||
56 | /* Output of allpass section */ | ||
57 | tmp2 = state[ i ] + warping * ( state[ i + 1 ] - tmp1 ); | ||
58 | state[ i ] = tmp1; | ||
59 | C[ i ] += state[ 0 ] * tmp1; | ||
60 | /* Output of allpass section */ | ||
61 | tmp1 = state[ i + 1 ] + warping * ( state[ i + 2 ] - tmp2 ); | ||
62 | state[ i + 1 ] = tmp2; | ||
63 | C[ i + 1 ] += state[ 0 ] * tmp2; | ||
64 | } | ||
65 | state[ order ] = tmp1; | ||
66 | C[ order ] += state[ 0 ] * tmp1; | ||
67 | } | ||
68 | |||
69 | /* Copy correlations in silk_float output format */ | ||
70 | for( i = 0; i < order + 1; i++ ) { | ||
71 | corr[ i ] = ( silk_float )C[ i ]; | ||
72 | } | ||
73 | } | ||