cannam@154: /***********************************************************************
cannam@154: Copyright (c) 2006-2011, Skype Limited. All rights reserved.
cannam@154: Redistribution and use in source and binary forms, with or without
cannam@154: modification, are permitted provided that the following conditions
cannam@154: are met:
cannam@154: - Redistributions of source code must retain the above copyright notice,
cannam@154: this list of conditions and the following disclaimer.
cannam@154: - Redistributions in binary form must reproduce the above copyright
cannam@154: notice, this list of conditions and the following disclaimer in the
cannam@154: documentation and/or other materials provided with the distribution.
cannam@154: - Neither the name of Internet Society, IETF or IETF Trust, nor the
cannam@154: names of specific contributors, may be used to endorse or promote
cannam@154: products derived from this software without specific prior written
cannam@154: permission.
cannam@154: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
cannam@154: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
cannam@154: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
cannam@154: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
cannam@154: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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cannam@154: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
cannam@154: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
cannam@154: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
cannam@154: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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cannam@154: ***********************************************************************/
cannam@154: 
cannam@154: #ifdef HAVE_CONFIG_H
cannam@154: #include "config.h"
cannam@154: #endif
cannam@154: 
cannam@154: #include "main_FLP.h"
cannam@154: #include "tuning_parameters.h"
cannam@154: 
cannam@154: void silk_find_LTP_FLP(
cannam@154:     silk_float                      XX[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O    Weight for LTP quantization         */
cannam@154:     silk_float                      xX[ MAX_NB_SUBFR * LTP_ORDER ],     /* O    Weight for LTP quantization                 */
cannam@154:     const silk_float                r_ptr[],                            /* I    LPC residual                                */
cannam@154:     const opus_int                  lag[ MAX_NB_SUBFR ],                /* I    LTP lags                                    */
cannam@154:     const opus_int                  subfr_length,                       /* I    Subframe length                             */
cannam@154:     const opus_int                  nb_subfr                            /* I    number of subframes                         */
cannam@154: )
cannam@154: {
cannam@154:     opus_int   k;
cannam@154:     silk_float *xX_ptr, *XX_ptr;
cannam@154:     const silk_float *lag_ptr;
cannam@154:     silk_float xx, temp;
cannam@154: 
cannam@154:     xX_ptr = xX;
cannam@154:     XX_ptr = XX;
cannam@154:     for( k = 0; k < nb_subfr; k++ ) {
cannam@154:         lag_ptr = r_ptr - ( lag[ k ] + LTP_ORDER / 2 );
cannam@154:         silk_corrMatrix_FLP( lag_ptr, subfr_length, LTP_ORDER, XX_ptr );
cannam@154:         silk_corrVector_FLP( lag_ptr, r_ptr, subfr_length, LTP_ORDER, xX_ptr );
cannam@154:         xx = ( silk_float )silk_energy_FLP( r_ptr, subfr_length + LTP_ORDER );
cannam@154:         temp = 1.0f / silk_max( xx, LTP_CORR_INV_MAX * 0.5f * ( XX_ptr[ 0 ] + XX_ptr[ 24 ] ) + 1.0f );
cannam@154:         silk_scale_vector_FLP( XX_ptr, temp, LTP_ORDER * LTP_ORDER );
cannam@154:         silk_scale_vector_FLP( xX_ptr, temp, LTP_ORDER );
cannam@154: 
cannam@154:         r_ptr  += subfr_length;
cannam@154:         XX_ptr += LTP_ORDER * LTP_ORDER;
cannam@154:         xX_ptr += LTP_ORDER;
cannam@154:     }
cannam@154: }