mirror of
https://github.com/UberGames/lilium-voyager.git
synced 2024-12-14 22:20:58 +00:00
56 lines
2.6 KiB
C
56 lines
2.6 KiB
C
|
/***********************************************************************
|
||
|
|
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
|
||
|
|
Redistribution and use in source and binary forms, with or without
|
||
|
|
modification, are permitted provided that the following conditions
|
||
|
|
are met:
|
||
|
|
- Redistributions of source code must retain the above copyright notice,
|
||
|
|
this list of conditions and the following disclaimer.
|
||
|
|
- Redistributions in binary form must reproduce the above copyright
|
||
|
|
notice, this list of conditions and the following disclaimer in the
|
||
|
|
documentation and/or other materials provided with the distribution.
|
||
|
|
- Neither the name of Internet Society, IETF or IETF Trust, nor the
|
||
|
|
names of specific contributors, may be used to endorse or promote
|
||
|
|
products derived from this software without specific prior written
|
||
|
|
permission.
|
||
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS”
|
||
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
||
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||
|
|
POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
***********************************************************************/
|
||
|
|
|
||
|
|
#ifdef HAVE_CONFIG_H
|
||
|
|
#include "config.h"
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include "SigProc_FIX.h"
|
||
|
|
#include "resampler_private.h"
|
||
|
|
|
||
|
|
/* Second order AR filter with single delay elements */
|
||
|
|
void silk_resampler_private_AR2(
|
||
|
|
opus_int32 S[], /* I/O State vector [ 2 ] */
|
||
|
|
opus_int32 out_Q8[], /* O Output signal */
|
||
|
|
const opus_int16 in[], /* I Input signal */
|
||
|
|
const opus_int16 A_Q14[], /* I AR coefficients, Q14 */
|
||
|
|
opus_int32 len /* I Signal length */
|
||
|
|
)
|
||
|
|
{
|
||
|
|
opus_int32 k;
|
||
|
|
opus_int32 out32;
|
||
|
|
|
||
|
|
for( k = 0; k < len; k++ ) {
|
||
|
|
out32 = silk_ADD_LSHIFT32( S[ 0 ], (opus_int32)in[ k ], 8 );
|
||
|
|
out_Q8[ k ] = out32;
|
||
|
|
out32 = silk_LSHIFT( out32, 2 );
|
||
|
|
S[ 0 ] = silk_SMLAWB( S[ 1 ], out32, A_Q14[ 0 ] );
|
||
|
|
S[ 1 ] = silk_SMULWB( out32, A_Q14[ 1 ] );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|