89 lines
4.5 KiB
C
89 lines
4.5 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, (subject to the limitations in the disclaimer below)
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are permitted provided that the following conditions 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 Skype Limited, nor the names of specific
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contributors, may be used to endorse or promote products derived from
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this software without specific prior written permission.
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NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
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BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
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BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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#include "SKP_Silk_main_FIX.h"
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/* Calculates residual energies of input subframes where all subframes have LPC_order */
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/* of preceeding samples */
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void SKP_Silk_residual_energy_FIX(
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SKP_int32 nrgs[ NB_SUBFR ], /* O Residual energy per subframe */
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SKP_int nrgsQ[ NB_SUBFR ], /* O Q value per subframe */
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const SKP_int16 x[], /* I Input signal */
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SKP_int16 a_Q12[ 2 ][ MAX_LPC_ORDER ],/* I AR coefs for each frame half */
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const SKP_int32 gains[ NB_SUBFR ], /* I Quantization gains */
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const SKP_int subfr_length, /* I Subframe length */
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const SKP_int LPC_order /* I LPC order */
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)
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{
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SKP_int offset, i, j, rshift, lz1, lz2;
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SKP_int16 *LPC_res_ptr, LPC_res[ ( MAX_FRAME_LENGTH + NB_SUBFR * MAX_LPC_ORDER ) / 2 ];
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const SKP_int16 *x_ptr;
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SKP_int16 S[ MAX_LPC_ORDER ];
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SKP_int32 tmp32;
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x_ptr = x;
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offset = LPC_order + subfr_length;
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/* Filter input to create the LPC residual for each frame half, and measure subframe energies */
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for( i = 0; i < 2; i++ ) {
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/* Calculate half frame LPC residual signal including preceeding samples */
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SKP_memset( S, 0, LPC_order * sizeof( SKP_int16 ) );
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SKP_Silk_LPC_analysis_filter( x_ptr, a_Q12[ i ], S, LPC_res, ( NB_SUBFR >> 1 ) * offset, LPC_order );
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/* Point to first subframe of the just calculated LPC residual signal */
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LPC_res_ptr = LPC_res + LPC_order;
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for( j = 0; j < ( NB_SUBFR >> 1 ); j++ ) {
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/* Measure subframe energy */
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SKP_Silk_sum_sqr_shift( &nrgs[ i * ( NB_SUBFR >> 1 ) + j ], &rshift, LPC_res_ptr, subfr_length );
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/* Set Q values for the measured energy */
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nrgsQ[ i * ( NB_SUBFR >> 1 ) + j ] = -rshift;
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/* Move to next subframe */
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LPC_res_ptr += offset;
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}
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/* Move to next frame half */
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x_ptr += ( NB_SUBFR >> 1 ) * offset;
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}
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/* Apply the squared subframe gains */
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for( i = 0; i < NB_SUBFR; i++ ) {
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/* Fully upscale gains and energies */
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lz1 = SKP_Silk_CLZ32( nrgs[ i ] ) - 1;
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lz2 = SKP_Silk_CLZ32( gains[ i ] ) - 1;
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tmp32 = SKP_LSHIFT32( gains[ i ], lz2 );
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/* Find squared gains */
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tmp32 = SKP_SMMUL( tmp32, tmp32 ); // Q( 2 * lz2 - 32 )
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/* Scale energies */
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nrgs[ i ] = SKP_SMMUL( tmp32, SKP_LSHIFT32( nrgs[ i ], lz1 ) ); // Q( nrgsQ[ i ] + lz1 + 2 * lz2 - 32 - 32 )
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nrgsQ[ i ] += lz1 + 2 * lz2 - 32 - 32;
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}
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}
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