1*a58d3d2aSXin Li /***********************************************************************
2*a58d3d2aSXin Li Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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6*a58d3d2aSXin Li - Redistributions of source code must retain the above copyright notice,
7*a58d3d2aSXin Li this list of conditions and the following disclaimer.
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13*a58d3d2aSXin Li products derived from this software without specific prior written
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15*a58d3d2aSXin Li THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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26*a58d3d2aSXin Li ***********************************************************************/
27*a58d3d2aSXin Li
28*a58d3d2aSXin Li #ifdef HAVE_CONFIG_H
29*a58d3d2aSXin Li #include "config.h"
30*a58d3d2aSXin Li #endif
31*a58d3d2aSXin Li
32*a58d3d2aSXin Li #include "SigProc_FIX.h"
33*a58d3d2aSXin Li
34*a58d3d2aSXin Li /* Step up function, converts reflection coefficients to prediction coefficients */
silk_k2a_Q16(opus_int32 * A_Q24,const opus_int32 * rc_Q16,const opus_int32 order)35*a58d3d2aSXin Li void silk_k2a_Q16(
36*a58d3d2aSXin Li opus_int32 *A_Q24, /* O Prediction coefficients [order] Q24 */
37*a58d3d2aSXin Li const opus_int32 *rc_Q16, /* I Reflection coefficients [order] Q16 */
38*a58d3d2aSXin Li const opus_int32 order /* I Prediction order */
39*a58d3d2aSXin Li )
40*a58d3d2aSXin Li {
41*a58d3d2aSXin Li opus_int k, n;
42*a58d3d2aSXin Li opus_int32 rc, tmp1, tmp2;
43*a58d3d2aSXin Li
44*a58d3d2aSXin Li for( k = 0; k < order; k++ ) {
45*a58d3d2aSXin Li rc = rc_Q16[ k ];
46*a58d3d2aSXin Li for( n = 0; n < (k + 1) >> 1; n++ ) {
47*a58d3d2aSXin Li tmp1 = A_Q24[ n ];
48*a58d3d2aSXin Li tmp2 = A_Q24[ k - n - 1 ];
49*a58d3d2aSXin Li A_Q24[ n ] = silk_SMLAWW( tmp1, tmp2, rc );
50*a58d3d2aSXin Li A_Q24[ k - n - 1 ] = silk_SMLAWW( tmp2, tmp1, rc );
51*a58d3d2aSXin Li }
52*a58d3d2aSXin Li A_Q24[ k ] = -silk_LSHIFT( rc, 8 );
53*a58d3d2aSXin Li }
54*a58d3d2aSXin Li }
55