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1 /***********************************************************************
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2 Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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3 Redistribution and use in source and binary forms, with or without
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4 modification, are permitted provided that the following conditions
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5 are met:
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6 - Redistributions of source code must retain the above copyright notice,
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7 this list of conditions and the following disclaimer.
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8 - Redistributions in binary form must reproduce the above copyright
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9 notice, this list of conditions and the following disclaimer in the
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10 documentation and/or other materials provided with the distribution.
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11 - Neither the name of Internet Society, IETF or IETF Trust, nor the
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12 names of specific contributors, may be used to endorse or promote
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13 products derived from this software without specific prior written
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14 permission.
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15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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25 POSSIBILITY OF SUCH DAMAGE.
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26 ***********************************************************************/
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27
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28 #ifdef HAVE_CONFIG_H
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29 #include "config.h"
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30 #endif
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31
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32 #include "main_FLP.h"
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33 #include "tuning_parameters.h"
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34
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35 void silk_find_LTP_FLP(
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36 silk_float XX[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O Weight for LTP quantization */
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37 silk_float xX[ MAX_NB_SUBFR * LTP_ORDER ], /* O Weight for LTP quantization */
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38 const silk_float r_ptr[], /* I LPC residual */
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39 const opus_int lag[ MAX_NB_SUBFR ], /* I LTP lags */
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40 const opus_int subfr_length, /* I Subframe length */
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41 const opus_int nb_subfr /* I number of subframes */
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42 )
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43 {
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44 opus_int k;
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45 silk_float *xX_ptr, *XX_ptr;
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46 const silk_float *lag_ptr;
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47 silk_float xx, temp;
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48
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49 xX_ptr = xX;
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50 XX_ptr = XX;
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51 for( k = 0; k < nb_subfr; k++ ) {
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52 lag_ptr = r_ptr - ( lag[ k ] + LTP_ORDER / 2 );
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53 silk_corrMatrix_FLP( lag_ptr, subfr_length, LTP_ORDER, XX_ptr );
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54 silk_corrVector_FLP( lag_ptr, r_ptr, subfr_length, LTP_ORDER, xX_ptr );
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55 xx = ( silk_float )silk_energy_FLP( r_ptr, subfr_length + LTP_ORDER );
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56 temp = 1.0f / silk_max( xx, LTP_CORR_INV_MAX * 0.5f * ( XX_ptr[ 0 ] + XX_ptr[ 24 ] ) + 1.0f );
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57 silk_scale_vector_FLP( XX_ptr, temp, LTP_ORDER * LTP_ORDER );
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58 silk_scale_vector_FLP( xX_ptr, temp, LTP_ORDER );
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59
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60 r_ptr += subfr_length;
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61 XX_ptr += LTP_ORDER * LTP_ORDER;
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62 xX_ptr += LTP_ORDER;
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63 }
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64 }
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