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      2 Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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     11 - Neither the name of Internet Society, IETF or IETF Trust, nor the
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     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
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     18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
     19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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     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.h"
     33 
     34 /* Interpolate two vectors */
     35 void silk_interpolate(
     36     opus_int16                  xi[ MAX_LPC_ORDER ],            /* O    interpolated vector                         */
     37     const opus_int16            x0[ MAX_LPC_ORDER ],            /* I    first vector                                */
     38     const opus_int16            x1[ MAX_LPC_ORDER ],            /* I    second vector                               */
     39     const opus_int              ifact_Q2,                       /* I    interp. factor, weight on 2nd vector        */
     40     const opus_int              d                               /* I    number of parameters                        */
     41 )
     42 {
     43     opus_int i;
     44 
     45     silk_assert( ifact_Q2 >= 0 );
     46     silk_assert( ifact_Q2 <= 4 );
     47 
     48     for( i = 0; i < d; i++ ) {
     49         xi[ i ] = (opus_int16)silk_ADD_RSHIFT( x0[ i ], silk_SMULBB( x1[ i ] - x0[ i ], ifact_Q2 ), 2 );
     50     }
     51 }
     52