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author | Vignesh Venkatasubramanian <vigneshv@google.com> | 2014-02-20 10:50:35 -0800 |
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committer | Vignesh Venkatasubramanian <vigneshv@google.com> | 2014-02-20 22:40:47 -0800 |
commit | 2bd8b54017b5320bc0c1df9bf86f4cdc9f8db242 (patch) | |
tree | 46d79debe81d3b1db1f11b1c79b4edeb9318fedc /silk/bwexpander_32.c | |
parent | 2010ddce09e55d41b92a36444a11cd747bfaf867 (diff) | |
download | libopus-2bd8b54017b5320bc0c1df9bf86f4cdc9f8db242.tar.gz |
Adding libopus source and Android.mk
Adding libopus source code and Android.mk. The source is based
on latest stable release libopus 1.1.
Change-Id: I0841894ee0766829e6d0e1b8379e6f6f87b0852f
Diffstat (limited to 'silk/bwexpander_32.c')
-rw-r--r-- | silk/bwexpander_32.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/silk/bwexpander_32.c b/silk/bwexpander_32.c new file mode 100644 index 00000000..d0010f73 --- /dev/null +++ b/silk/bwexpander_32.c @@ -0,0 +1,50 @@ +/*********************************************************************** +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" + +/* Chirp (bandwidth expand) LP AR filter */ +void silk_bwexpander_32( + opus_int32 *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 in Q16 */ +) +{ + opus_int i; + opus_int32 chirp_minus_one_Q16 = chirp_Q16 - 65536; + + for( i = 0; i < d - 1; i++ ) { + ar[ i ] = silk_SMULWW( chirp_Q16, ar[ i ] ); + chirp_Q16 += silk_RSHIFT_ROUND( silk_MUL( chirp_Q16, chirp_minus_one_Q16 ), 16 ); + } + ar[ d - 1 ] = silk_SMULWW( chirp_Q16, ar[ d - 1 ] ); +} + |