1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libopus/silk/fixed/residual_energy_FIX.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,97 @@
1.4 +/***********************************************************************
1.5 +Copyright (c) 2006-2011, Skype Limited. All rights reserved.
1.6 +Redistribution and use in source and binary forms, with or without
1.7 +modification, are permitted provided that the following conditions
1.8 +are met:
1.9 +- Redistributions of source code must retain the above copyright notice,
1.10 +this list of conditions and the following disclaimer.
1.11 +- Redistributions in binary form must reproduce the above copyright
1.12 +notice, this list of conditions and the following disclaimer in the
1.13 +documentation and/or other materials provided with the distribution.
1.14 +- Neither the name of Internet Society, IETF or IETF Trust, nor the
1.15 +names of specific contributors, may be used to endorse or promote
1.16 +products derived from this software without specific prior written
1.17 +permission.
1.18 +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
1.19 +AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.20 +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.21 +ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
1.22 +LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.23 +CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.24 +SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.25 +INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.26 +CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.27 +ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.28 +POSSIBILITY OF SUCH DAMAGE.
1.29 +***********************************************************************/
1.30 +
1.31 +#ifdef HAVE_CONFIG_H
1.32 +#include "config.h"
1.33 +#endif
1.34 +
1.35 +#include "main_FIX.h"
1.36 +#include "stack_alloc.h"
1.37 +
1.38 +/* Calculates residual energies of input subframes where all subframes have LPC_order */
1.39 +/* of preceding samples */
1.40 +void silk_residual_energy_FIX(
1.41 + opus_int32 nrgs[ MAX_NB_SUBFR ], /* O Residual energy per subframe */
1.42 + opus_int nrgsQ[ MAX_NB_SUBFR ], /* O Q value per subframe */
1.43 + const opus_int16 x[], /* I Input signal */
1.44 + opus_int16 a_Q12[ 2 ][ MAX_LPC_ORDER ], /* I AR coefs for each frame half */
1.45 + const opus_int32 gains[ MAX_NB_SUBFR ], /* I Quantization gains */
1.46 + const opus_int subfr_length, /* I Subframe length */
1.47 + const opus_int nb_subfr, /* I Number of subframes */
1.48 + const opus_int LPC_order /* I LPC order */
1.49 +)
1.50 +{
1.51 + opus_int offset, i, j, rshift, lz1, lz2;
1.52 + opus_int16 *LPC_res_ptr;
1.53 + VARDECL( opus_int16, LPC_res );
1.54 + const opus_int16 *x_ptr;
1.55 + opus_int32 tmp32;
1.56 + SAVE_STACK;
1.57 +
1.58 + x_ptr = x;
1.59 + offset = LPC_order + subfr_length;
1.60 +
1.61 + /* Filter input to create the LPC residual for each frame half, and measure subframe energies */
1.62 + ALLOC( LPC_res, ( MAX_NB_SUBFR >> 1 ) * offset, opus_int16 );
1.63 + silk_assert( ( nb_subfr >> 1 ) * ( MAX_NB_SUBFR >> 1 ) == nb_subfr );
1.64 + for( i = 0; i < nb_subfr >> 1; i++ ) {
1.65 + /* Calculate half frame LPC residual signal including preceding samples */
1.66 + silk_LPC_analysis_filter( LPC_res, x_ptr, a_Q12[ i ], ( MAX_NB_SUBFR >> 1 ) * offset, LPC_order );
1.67 +
1.68 + /* Point to first subframe of the just calculated LPC residual signal */
1.69 + LPC_res_ptr = LPC_res + LPC_order;
1.70 + for( j = 0; j < ( MAX_NB_SUBFR >> 1 ); j++ ) {
1.71 + /* Measure subframe energy */
1.72 + silk_sum_sqr_shift( &nrgs[ i * ( MAX_NB_SUBFR >> 1 ) + j ], &rshift, LPC_res_ptr, subfr_length );
1.73 +
1.74 + /* Set Q values for the measured energy */
1.75 + nrgsQ[ i * ( MAX_NB_SUBFR >> 1 ) + j ] = -rshift;
1.76 +
1.77 + /* Move to next subframe */
1.78 + LPC_res_ptr += offset;
1.79 + }
1.80 + /* Move to next frame half */
1.81 + x_ptr += ( MAX_NB_SUBFR >> 1 ) * offset;
1.82 + }
1.83 +
1.84 + /* Apply the squared subframe gains */
1.85 + for( i = 0; i < nb_subfr; i++ ) {
1.86 + /* Fully upscale gains and energies */
1.87 + lz1 = silk_CLZ32( nrgs[ i ] ) - 1;
1.88 + lz2 = silk_CLZ32( gains[ i ] ) - 1;
1.89 +
1.90 + tmp32 = silk_LSHIFT32( gains[ i ], lz2 );
1.91 +
1.92 + /* Find squared gains */
1.93 + tmp32 = silk_SMMUL( tmp32, tmp32 ); /* Q( 2 * lz2 - 32 )*/
1.94 +
1.95 + /* Scale energies */
1.96 + nrgs[ i ] = silk_SMMUL( tmp32, silk_LSHIFT32( nrgs[ i ], lz1 ) ); /* Q( nrgsQ[ i ] + lz1 + 2 * lz2 - 32 - 32 )*/
1.97 + nrgsQ[ i ] += lz1 + 2 * lz2 - 32 - 32;
1.98 + }
1.99 + RESTORE_STACK;
1.100 +}
