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comparison: media/libopus/silk/resampler_private_AR2.c
media/libopus/silk/resampler_private_AR2.c
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:527e800a4af1 |
|---|---|
| 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 #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 |
