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Diffstat (limited to 'drivers/opus/silk/bwexpander.c')
| -rw-r--r-- | drivers/opus/silk/bwexpander.c | 48 |
1 files changed, 0 insertions, 48 deletions
diff --git a/drivers/opus/silk/bwexpander.c b/drivers/opus/silk/bwexpander.c deleted file mode 100644 index e7cc448520..0000000000 --- a/drivers/opus/silk/bwexpander.c +++ /dev/null @@ -1,48 +0,0 @@ -/*********************************************************************** -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. -***********************************************************************/ -#include "opus/opus_config.h" - -#include "opus/silk/SigProc_FIX.h" - -/* Chirp (bandwidth expand) LP AR filter */ -void silk_bwexpander( - opus_int16 *ar, /* I/O AR filter to be expanded (without leading 1) */ - const opus_int d, /* I Length of ar */ - opus_int32 chirp_Q16 /* I Chirp factor (typically in the range 0 to 1) */ -) -{ - opus_int i; - opus_int32 chirp_minus_one_Q16 = chirp_Q16 - 65536; - - /* NB: Dont use silk_SMULWB, instead of silk_RSHIFT_ROUND( silk_MUL(), 16 ), below. */ - /* Bias in silk_SMULWB can lead to unstable filters */ - for( i = 0; i < d - 1; i++ ) { - ar[ i ] = (opus_int16)silk_RSHIFT_ROUND( silk_MUL( chirp_Q16, ar[ i ] ), 16 ); - chirp_Q16 += silk_RSHIFT_ROUND( silk_MUL( chirp_Q16, chirp_minus_one_Q16 ), 16 ); - } - ar[ d - 1 ] = (opus_int16)silk_RSHIFT_ROUND( silk_MUL( chirp_Q16, ar[ d - 1 ] ), 16 ); -} |