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Diffstat (limited to 'lib/rbcodec/codecs/libopus/silk/fixed/k2a_FIX.c')
-rw-r--r-- | lib/rbcodec/codecs/libopus/silk/fixed/k2a_FIX.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libopus/silk/fixed/k2a_FIX.c b/lib/rbcodec/codecs/libopus/silk/fixed/k2a_FIX.c new file mode 100644 index 0000000000..549f6eadaa --- /dev/null +++ b/lib/rbcodec/codecs/libopus/silk/fixed/k2a_FIX.c | |||
@@ -0,0 +1,54 @@ | |||
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 "SigProc_FIX.h" | ||
33 | |||
34 | /* Step up function, converts reflection coefficients to prediction coefficients */ | ||
35 | void silk_k2a( | ||
36 | opus_int32 *A_Q24, /* O Prediction coefficients [order] Q24 */ | ||
37 | const opus_int16 *rc_Q15, /* I Reflection coefficients [order] Q15 */ | ||
38 | const opus_int32 order /* I Prediction order */ | ||
39 | ) | ||
40 | { | ||
41 | opus_int k, n; | ||
42 | opus_int32 rc, tmp1, tmp2; | ||
43 | |||
44 | for( k = 0; k < order; k++ ) { | ||
45 | rc = rc_Q15[ k ]; | ||
46 | for( n = 0; n < (k + 1) >> 1; n++ ) { | ||
47 | tmp1 = A_Q24[ n ]; | ||
48 | tmp2 = A_Q24[ k - n - 1 ]; | ||
49 | A_Q24[ n ] = silk_SMLAWB( tmp1, silk_LSHIFT( tmp2, 1 ), rc ); | ||
50 | A_Q24[ k - n - 1 ] = silk_SMLAWB( tmp2, silk_LSHIFT( tmp1, 1 ), rc ); | ||
51 | } | ||
52 | A_Q24[ k ] = -silk_LSHIFT( (opus_int32)rc_Q15[ k ], 9 ); | ||
53 | } | ||
54 | } | ||