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54 lines
2.6 KiB
54 lines
2.6 KiB
/*********************************************************************** |
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Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
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Redistribution and use in source and binary forms, with or without |
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modification, are permitted provided that the following conditions |
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are met: |
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- Redistributions of source code must retain the above copyright notice, |
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this list of conditions and the following disclaimer. |
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- Redistributions in binary form must reproduce the above copyright |
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notice, this list of conditions and the following disclaimer in the |
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documentation and/or other materials provided with the distribution. |
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- Neither the name of Internet Society, IETF or IETF Trust, nor the |
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names of specific contributors, may be used to endorse or promote |
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products derived from this software without specific prior written |
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permission. |
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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POSSIBILITY OF SUCH DAMAGE. |
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***********************************************************************/ |
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#ifdef HAVE_CONFIG_H |
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#include "config.h" |
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#endif |
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#include "SigProc_FIX.h" |
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#include "resampler_private.h" |
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/* Second order AR filter with single delay elements */ |
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void silk_resampler_private_AR2( |
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opus_int32 S[], /* I/O State vector [ 2 ] */ |
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opus_int32 out_Q8[], /* O Output signal */ |
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const opus_int16 in[], /* I Input signal */ |
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const opus_int16 A_Q14[], /* I AR coefficients, Q14 */ |
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opus_int32 len /* I Signal length */ |
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) |
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{ |
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opus_int32 k; |
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opus_int32 out32; |
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for( k = 0; k < len; k++ ) { |
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out32 = silk_ADD_LSHIFT32( S[ 0 ], (opus_int32)in[ k ], 8 ); |
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out_Q8[ k ] = out32; |
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out32 = silk_LSHIFT( out32, 2 ); |
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S[ 0 ] = silk_SMLAWB( S[ 1 ], out32, A_Q14[ 0 ] ); |
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S[ 1 ] = silk_SMULWB( out32, A_Q14[ 1 ] ); |
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} |
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}
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