Chris@69: /***********************************************************************
Chris@69: Copyright (c) 2006-2011, Skype Limited. All rights reserved.
Chris@69: Redistribution and use in source and binary forms, with or without
Chris@69: modification, are permitted provided that the following conditions
Chris@69: are met:
Chris@69: - Redistributions of source code must retain the above copyright notice,
Chris@69: this list of conditions and the following disclaimer.
Chris@69: - Redistributions in binary form must reproduce the above copyright
Chris@69: notice, this list of conditions and the following disclaimer in the
Chris@69: documentation and/or other materials provided with the distribution.
Chris@69: - Neither the name of Internet Society, IETF or IETF Trust, nor the
Chris@69: names of specific contributors, may be used to endorse or promote
Chris@69: products derived from this software without specific prior written
Chris@69: permission.
Chris@69: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
Chris@69: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
Chris@69: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
Chris@69: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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Chris@69: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
Chris@69: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
Chris@69: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
Chris@69: POSSIBILITY OF SUCH DAMAGE.
Chris@69: ***********************************************************************/
Chris@69: 
Chris@69: #ifdef HAVE_CONFIG_H
Chris@69: #include "config.h"
Chris@69: #endif
Chris@69: 
Chris@69: #include "main_FLP.h"
Chris@69: #include "tuning_parameters.h"
Chris@69: 
Chris@69: void silk_find_LTP_FLP(
Chris@69:     silk_float                      XX[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O    Weight for LTP quantization         */
Chris@69:     silk_float                      xX[ MAX_NB_SUBFR * LTP_ORDER ],     /* O    Weight for LTP quantization                 */
Chris@69:     const silk_float                r_ptr[],                            /* I    LPC residual                                */
Chris@69:     const opus_int                  lag[ MAX_NB_SUBFR ],                /* I    LTP lags                                    */
Chris@69:     const opus_int                  subfr_length,                       /* I    Subframe length                             */
Chris@69:     const opus_int                  nb_subfr                            /* I    number of subframes                         */
Chris@69: )
Chris@69: {
Chris@69:     opus_int   k;
Chris@69:     silk_float *xX_ptr, *XX_ptr;
Chris@69:     const silk_float *lag_ptr;
Chris@69:     silk_float xx, temp;
Chris@69: 
Chris@69:     xX_ptr = xX;
Chris@69:     XX_ptr = XX;
Chris@69:     for( k = 0; k < nb_subfr; k++ ) {
Chris@69:         lag_ptr = r_ptr - ( lag[ k ] + LTP_ORDER / 2 );
Chris@69:         silk_corrMatrix_FLP( lag_ptr, subfr_length, LTP_ORDER, XX_ptr );
Chris@69:         silk_corrVector_FLP( lag_ptr, r_ptr, subfr_length, LTP_ORDER, xX_ptr );
Chris@69:         xx = ( silk_float )silk_energy_FLP( r_ptr, subfr_length + LTP_ORDER );
Chris@69:         temp = 1.0f / silk_max( xx, LTP_CORR_INV_MAX * 0.5f * ( XX_ptr[ 0 ] + XX_ptr[ 24 ] ) + 1.0f );
Chris@69:         silk_scale_vector_FLP( XX_ptr, temp, LTP_ORDER * LTP_ORDER );
Chris@69:         silk_scale_vector_FLP( xX_ptr, temp, LTP_ORDER );
Chris@69: 
Chris@69:         r_ptr  += subfr_length;
Chris@69:         XX_ptr += LTP_ORDER * LTP_ORDER;
Chris@69:         xX_ptr += LTP_ORDER;
Chris@69:     }
Chris@69: }