diff options
Diffstat (limited to 'lib/rbcodec/codecs/libopus/silk/resampler_private_AR2.c')
-rw-r--r-- | lib/rbcodec/codecs/libopus/silk/resampler_private_AR2.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libopus/silk/resampler_private_AR2.c b/lib/rbcodec/codecs/libopus/silk/resampler_private_AR2.c new file mode 100644 index 0000000000..2ec7625e7e --- /dev/null +++ b/lib/rbcodec/codecs/libopus/silk/resampler_private_AR2.c | |||
@@ -0,0 +1,55 @@ | |||
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 "opus_config.h" | ||
30 | #endif | ||
31 | |||
32 | #include "SigProc_FIX.h" | ||
33 | #include "resampler_private.h" | ||
34 | |||
35 | /* Second order AR filter with single delay elements */ | ||
36 | void silk_resampler_private_AR2( | ||
37 | opus_int32 S[], /* I/O State vector [ 2 ] */ | ||
38 | opus_int32 out_Q8[], /* O Output signal */ | ||
39 | const opus_int16 in[], /* I Input signal */ | ||
40 | const opus_int16 A_Q14[], /* I AR coefficients, Q14 */ | ||
41 | opus_int32 len /* I Signal length */ | ||
42 | ) | ||
43 | { | ||
44 | opus_int32 k; | ||
45 | opus_int32 out32; | ||
46 | |||
47 | for( k = 0; k < len; k++ ) { | ||
48 | out32 = silk_ADD_LSHIFT32( S[ 0 ], (opus_int32)in[ k ], 8 ); | ||
49 | out_Q8[ k ] = out32; | ||
50 | out32 = silk_LSHIFT( out32, 2 ); | ||
51 | S[ 0 ] = silk_SMLAWB( S[ 1 ], out32, A_Q14[ 0 ] ); | ||
52 | S[ 1 ] = silk_SMULWB( out32, A_Q14[ 1 ] ); | ||
53 | } | ||
54 | } | ||
55 | |||