Line data    Source code

       1             : /***********************************************************************
       2             : Copyright (c) 2006-2011, Skype Limited. All rights reserved.
       3             : Redistribution and use in source and binary forms, with or without
       4             : modification, are permitted provided that the following conditions
       5             : are met:
       6             : - Redistributions of source code must retain the above copyright notice,
       7             : this list of conditions and the following disclaimer.
       8             : - Redistributions in binary form must reproduce the above copyright
       9             : notice, this list of conditions and the following disclaimer in the
      10             : documentation and/or other materials provided with the distribution.
      11             : - Neither the name of Internet Society, IETF or IETF Trust, nor the
      12             : names of specific contributors, may be used to endorse or promote
      13             : products derived from this software without specific prior written
      14             : permission.
      15             : THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
      16             : AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      17             : IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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      22             : INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
      23             : CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
      24             : ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
      25             : POSSIBILITY OF SUCH DAMAGE.
      26             : ***********************************************************************/
      27             : 
      28             : #ifdef HAVE_CONFIG_H
      29             : #include "config.h"
      30             : #endif
      31             : 
      32             : #include "main_FLP.h"
      33             : #include "tuning_parameters.h"
      34             : 
      35           0 : void silk_find_LTP_FLP(
      36             :     silk_float                      XX[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O    Weight for LTP quantization         */
      37             :     silk_float                      xX[ MAX_NB_SUBFR * LTP_ORDER ],     /* O    Weight for LTP quantization                 */
      38             :     const silk_float                r_ptr[],                            /* I    LPC residual                                */
      39             :     const opus_int                  lag[ MAX_NB_SUBFR ],                /* I    LTP lags                                    */
      40             :     const opus_int                  subfr_length,                       /* I    Subframe length                             */
      41             :     const opus_int                  nb_subfr                            /* I    number of subframes                         */
      42             : )
      43             : {
      44             :     opus_int   k;
      45             :     silk_float *xX_ptr, *XX_ptr;
      46             :     const silk_float *lag_ptr;
      47             :     silk_float xx, temp;
      48             : 
      49           0 :     xX_ptr = xX;
      50           0 :     XX_ptr = XX;
      51           0 :     for( k = 0; k < nb_subfr; k++ ) {
      52           0 :         lag_ptr = r_ptr - ( lag[ k ] + LTP_ORDER / 2 );
      53           0 :         silk_corrMatrix_FLP( lag_ptr, subfr_length, LTP_ORDER, XX_ptr );
      54           0 :         silk_corrVector_FLP( lag_ptr, r_ptr, subfr_length, LTP_ORDER, xX_ptr );
      55           0 :         xx = ( silk_float )silk_energy_FLP( r_ptr, subfr_length + LTP_ORDER );
      56           0 :         temp = 1.0f / silk_max( xx, LTP_CORR_INV_MAX * 0.5f * ( XX_ptr[ 0 ] + XX_ptr[ 24 ] ) + 1.0f );
      57           0 :         silk_scale_vector_FLP( XX_ptr, temp, LTP_ORDER * LTP_ORDER );
      58           0 :         silk_scale_vector_FLP( xX_ptr, temp, LTP_ORDER );
      59             : 
      60           0 :         r_ptr  += subfr_length;
      61           0 :         XX_ptr += LTP_ORDER * LTP_ORDER;
      62           0 :         xX_ptr += LTP_ORDER;
      63             :     }
      64           0 : }