65 lines
3.3 KiB
C
65 lines
3.3 KiB
C
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/***********************************************************************
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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_FLP.h"
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#include "tuning_parameters.h"
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void silk_find_LTP_FLP(
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silk_float XX[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O Weight for LTP quantization */
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silk_float xX[ MAX_NB_SUBFR * LTP_ORDER ], /* O Weight for LTP quantization */
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const silk_float r_ptr[], /* I LPC residual */
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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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)
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{
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opus_int k;
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silk_float *xX_ptr, *XX_ptr;
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const silk_float *lag_ptr;
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silk_float xx, temp;
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xX_ptr = xX;
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XX_ptr = XX;
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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_corrMatrix_FLP( lag_ptr, subfr_length, LTP_ORDER, XX_ptr );
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silk_corrVector_FLP( lag_ptr, r_ptr, subfr_length, LTP_ORDER, xX_ptr );
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xx = ( silk_float )silk_energy_FLP( r_ptr, subfr_length + LTP_ORDER );
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temp = 1.0f / silk_max( xx, LTP_CORR_INV_MAX * 0.5f * ( XX_ptr[ 0 ] + XX_ptr[ 24 ] ) + 1.0f );
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silk_scale_vector_FLP( XX_ptr, temp, LTP_ORDER * LTP_ORDER );
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silk_scale_vector_FLP( xX_ptr, temp, LTP_ORDER );
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r_ptr += subfr_length;
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XX_ptr += LTP_ORDER * LTP_ORDER;
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xX_ptr += LTP_ORDER;
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}
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}
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