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99 lines
5.3 KiB
C
99 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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "main_FIX.h"
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#include "tuning_parameters.h"
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void silk_find_LTP_FIX(
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opus_int32 XXLTP_Q17[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O Correlation matrix */
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opus_int32 xXLTP_Q17[ MAX_NB_SUBFR * LTP_ORDER ], /* O Correlation vector */
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const opus_int16 r_ptr[], /* I Residual signal after LPC */
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const opus_int lag[ MAX_NB_SUBFR ], /* I LTP lags */
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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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int arch /* I Run-time architecture */
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)
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{
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opus_int i, k, extra_shifts;
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opus_int xx_shifts, xX_shifts, XX_shifts;
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const opus_int16 *lag_ptr;
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opus_int32 *XXLTP_Q17_ptr, *xXLTP_Q17_ptr;
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opus_int32 xx, nrg, temp;
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xXLTP_Q17_ptr = xXLTP_Q17;
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XXLTP_Q17_ptr = XXLTP_Q17;
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for( k = 0; k < nb_subfr; k++ ) {
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lag_ptr = r_ptr - ( lag[ k ] + LTP_ORDER / 2 );
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silk_sum_sqr_shift( &xx, &xx_shifts, r_ptr, subfr_length + LTP_ORDER ); /* xx in Q( -xx_shifts ) */
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silk_corrMatrix_FIX( lag_ptr, subfr_length, LTP_ORDER, XXLTP_Q17_ptr, &nrg, &XX_shifts, arch ); /* XXLTP_Q17_ptr and nrg in Q( -XX_shifts ) */
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extra_shifts = xx_shifts - XX_shifts;
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if( extra_shifts > 0 ) {
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/* Shift XX */
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xX_shifts = xx_shifts;
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for( i = 0; i < LTP_ORDER * LTP_ORDER; i++ ) {
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XXLTP_Q17_ptr[ i ] = silk_RSHIFT32( XXLTP_Q17_ptr[ i ], extra_shifts ); /* Q( -xX_shifts ) */
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}
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nrg = silk_RSHIFT32( nrg, extra_shifts ); /* Q( -xX_shifts ) */
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} else if( extra_shifts < 0 ) {
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/* Shift xx */
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xX_shifts = XX_shifts;
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xx = silk_RSHIFT32( xx, -extra_shifts ); /* Q( -xX_shifts ) */
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} else {
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xX_shifts = xx_shifts;
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}
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silk_corrVector_FIX( lag_ptr, r_ptr, subfr_length, LTP_ORDER, xXLTP_Q17_ptr, xX_shifts, arch ); /* xXLTP_Q17_ptr in Q( -xX_shifts ) */
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/* At this point all correlations are in Q(-xX_shifts) */
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temp = silk_SMLAWB( 1, nrg, SILK_FIX_CONST( LTP_CORR_INV_MAX, 16 ) );
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temp = silk_max( temp, xx );
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TIC(div)
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#if 0
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for( i = 0; i < LTP_ORDER * LTP_ORDER; i++ ) {
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XXLTP_Q17_ptr[ i ] = silk_DIV32_varQ( XXLTP_Q17_ptr[ i ], temp, 17 );
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}
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for( i = 0; i < LTP_ORDER; i++ ) {
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xXLTP_Q17_ptr[ i ] = silk_DIV32_varQ( xXLTP_Q17_ptr[ i ], temp, 17 );
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}
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#else
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for( i = 0; i < LTP_ORDER * LTP_ORDER; i++ ) {
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XXLTP_Q17_ptr[ i ] = (opus_int32)( silk_LSHIFT64( (opus_int64)XXLTP_Q17_ptr[ i ], 17 ) / temp );
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}
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for( i = 0; i < LTP_ORDER; i++ ) {
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xXLTP_Q17_ptr[ i ] = (opus_int32)( silk_LSHIFT64( (opus_int64)xXLTP_Q17_ptr[ i ], 17 ) / temp );
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}
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#endif
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TOC(div)
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r_ptr += subfr_length;
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XXLTP_Q17_ptr += LTP_ORDER * LTP_ORDER;
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xXLTP_Q17_ptr += LTP_ORDER;
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}
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}
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