95 lines
5.3 KiB
C
95 lines
5.3 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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#include "opus/opus_config.h"
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#include "opus/silk/fixed/main_FIX.h"
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#include "opus/celt/stack_alloc.h"
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/* Calculates residual energies of input subframes where all subframes have LPC_order */
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/* of preceding samples */
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void silk_residual_energy_FIX(
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opus_int32 nrgs[ MAX_NB_SUBFR ], /* O Residual energy per subframe */
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opus_int nrgsQ[ MAX_NB_SUBFR ], /* O Q value per subframe */
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const opus_int16 x[], /* I Input signal */
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opus_int16 a_Q12[ 2 ][ MAX_LPC_ORDER ], /* I AR coefs for each frame half */
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const opus_int32 gains[ MAX_NB_SUBFR ], /* I Quantization gains */
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const opus_int subfr_length, /* I Subframe length */
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const opus_int nb_subfr, /* I Number of subframes */
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const opus_int LPC_order, /* I LPC order */
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int arch /* I Run-time architecture */
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)
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{
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opus_int offset, i, j, rshift, lz1, lz2;
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opus_int16 *LPC_res_ptr;
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VARDECL( opus_int16, LPC_res );
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const opus_int16 *x_ptr;
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opus_int32 tmp32;
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SAVE_STACK;
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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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ALLOC( LPC_res, ( MAX_NB_SUBFR >> 1 ) * offset, opus_int16 );
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silk_assert( ( nb_subfr >> 1 ) * ( MAX_NB_SUBFR >> 1 ) == nb_subfr );
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for( i = 0; i < nb_subfr >> 1; i++ ) {
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/* Calculate half frame LPC residual signal including preceding samples */
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silk_LPC_analysis_filter( LPC_res, x_ptr, a_Q12[ i ], ( MAX_NB_SUBFR >> 1 ) * offset, LPC_order, arch );
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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 < ( MAX_NB_SUBFR >> 1 ); j++ ) {
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/* Measure subframe energy */
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silk_sum_sqr_shift( &nrgs[ i * ( MAX_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 * ( MAX_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 += ( MAX_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 = silk_CLZ32( nrgs[ i ] ) - 1;
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lz2 = silk_CLZ32( gains[ i ] ) - 1;
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tmp32 = silk_LSHIFT32( gains[ i ], lz2 );
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/* Find squared gains */
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tmp32 = silk_SMMUL( tmp32, tmp32 ); /* Q( 2 * lz2 - 32 )*/
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/* Scale energies */
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nrgs[ i ] = silk_SMMUL( tmp32, silk_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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RESTORE_STACK;
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}
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