9b7ec42403
Sync to commit bb4b6885a139644cf3ac14e7deda9f633ec2d93c
This brings in a bunch of optimizations to decode speed
and memory usage. Allocations are switched from using
the pseudostack to using the real stack. Enabled hacks
to reduce stack usage.
This should fix crashes on sansa clip, although some
files will not play due to failing allocations in the
codec buffer.
Speeds up decoding of the following test files:
H300 (cf) C200 (arm7tdmi) ipod classic (arm9e)
16 kbps (silk) 14.28 MHz 4.00 MHz 2.61 MHz
64 kbps (celt) 4.09 MHz 8.08 MHz 6.24 MHz
128 kbps (celt) 1.93 MHz 8.83 MHz 6.53 MHz
Change-Id: I851733a8a5824b61feb363a173091bc7e6629b58
86 lines
3.6 KiB
C
86 lines
3.6 KiB
C
/***********************************************************************
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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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/* Compute number of bits to right shift the sum of squares of a vector */
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/* of int16s to make it fit in an int32 */
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void silk_sum_sqr_shift(
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opus_int32 *energy, /* O Energy of x, after shifting to the right */
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opus_int *shift, /* O Number of bits right shift applied to energy */
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const opus_int16 *x, /* I Input vector */
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opus_int len /* I Length of input vector */
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)
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{
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opus_int i, shft;
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opus_int32 nrg_tmp, nrg;
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nrg = 0;
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shft = 0;
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len--;
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for( i = 0; i < len; i += 2 ) {
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nrg = silk_SMLABB_ovflw( nrg, x[ i ], x[ i ] );
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nrg = silk_SMLABB_ovflw( nrg, x[ i + 1 ], x[ i + 1 ] );
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if( nrg < 0 ) {
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/* Scale down */
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nrg = (opus_int32)silk_RSHIFT_uint( (opus_uint32)nrg, 2 );
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shft = 2;
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i+=2;
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break;
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}
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}
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for( ; i < len; i += 2 ) {
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nrg_tmp = silk_SMULBB( x[ i ], x[ i ] );
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nrg_tmp = silk_SMLABB_ovflw( nrg_tmp, x[ i + 1 ], x[ i + 1 ] );
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nrg = (opus_int32)silk_ADD_RSHIFT_uint( nrg, (opus_uint32)nrg_tmp, shft );
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if( nrg < 0 ) {
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/* Scale down */
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nrg = (opus_int32)silk_RSHIFT_uint( (opus_uint32)nrg, 2 );
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shft += 2;
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}
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}
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if( i == len ) {
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/* One sample left to process */
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nrg_tmp = silk_SMULBB( x[ i ], x[ i ] );
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nrg = (opus_int32)silk_ADD_RSHIFT_uint( nrg, nrg_tmp, shft );
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}
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/* Make sure to have at least one extra leading zero (two leading zeros in total) */
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if( nrg & 0xC0000000 ) {
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nrg = silk_RSHIFT_uint( (opus_uint32)nrg, 2 );
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shft += 2;
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}
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/* Output arguments */
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*shift = shft;
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*energy = nrg;
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}
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