diff options
Diffstat (limited to 'src/opus-1.0.2/silk/sum_sqr_shift.c')
| -rw-r--r-- | src/opus-1.0.2/silk/sum_sqr_shift.c | 85 |
1 files changed, 0 insertions, 85 deletions
diff --git a/src/opus-1.0.2/silk/sum_sqr_shift.c b/src/opus-1.0.2/silk/sum_sqr_shift.c deleted file mode 100644 index 2eaf77b6..00000000 --- a/src/opus-1.0.2/silk/sum_sqr_shift.c +++ /dev/null @@ -1,85 +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. -***********************************************************************/ - -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif - -#include "SigProc_FIX.h" - -/* Compute number of bits to right shift the sum of squares of a vector */ -/* of int16s to make it fit in an int32 */ -void silk_sum_sqr_shift( - opus_int32 *energy, /* O Energy of x, after shifting to the right */ - opus_int *shift, /* O Number of bits right shift applied to energy */ - const opus_int16 *x, /* I Input vector */ - opus_int len /* I Length of input vector */ -) -{ - opus_int i, shft; - opus_int32 nrg_tmp, nrg; - - nrg = 0; - shft = 0; - len--; - for( i = 0; i < len; i += 2 ) { - nrg = silk_SMLABB_ovflw( nrg, x[ i ], x[ i ] ); - nrg = silk_SMLABB_ovflw( nrg, x[ i + 1 ], x[ i + 1 ] ); - if( nrg < 0 ) { - /* Scale down */ - nrg = (opus_int32)silk_RSHIFT_uint( (opus_uint32)nrg, 2 ); - shft = 2; - break; - } - } - for( ; i < len; i += 2 ) { - nrg_tmp = silk_SMULBB( x[ i ], x[ i ] ); - nrg_tmp = silk_SMLABB_ovflw( nrg_tmp, x[ i + 1 ], x[ i + 1 ] ); - nrg = (opus_int32)silk_ADD_RSHIFT_uint( nrg, (opus_uint32)nrg_tmp, shft ); - if( nrg < 0 ) { - /* Scale down */ - nrg = (opus_int32)silk_RSHIFT_uint( (opus_uint32)nrg, 2 ); - shft += 2; - } - } - if( i == len ) { - /* One sample left to process */ - nrg_tmp = silk_SMULBB( x[ i ], x[ i ] ); - nrg = (opus_int32)silk_ADD_RSHIFT_uint( nrg, nrg_tmp, shft ); - } - - /* Make sure to have at least one extra leading zero (two leading zeros in total) */ - if( nrg & 0xC0000000 ) { - nrg = silk_RSHIFT_uint( (opus_uint32)nrg, 2 ); - shft += 2; - } - - /* Output arguments */ - *shift = shft; - *energy = nrg; -} - |