1/*
2 *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11/******************************************************************
12
13 iLBC Speech Coder ANSI-C Source Code
14
15 WebRtcIlbcfix_LspInterpolate2PolyDec.c
16
17******************************************************************/
18
19#include "interpolate.h"
20#include "lsf_to_poly.h"
21#include "defines.h"
22
23/*----------------------------------------------------------------*
24 *  interpolation of lsf coefficients for the decoder
25 *---------------------------------------------------------------*/
26
27void WebRtcIlbcfix_LspInterpolate2PolyDec(
28    int16_t *a,   /* (o) lpc coefficients Q12 */
29    int16_t *lsf1,  /* (i) first set of lsf coefficients Q13 */
30    int16_t *lsf2,  /* (i) second set of lsf coefficients Q13 */
31    int16_t coef,  /* (i) weighting coefficient to use between
32                                   lsf1 and lsf2 Q14 */
33    int16_t length  /* (i) length of coefficient vectors */
34                                          ){
35  int16_t lsftmp[LPC_FILTERORDER];
36
37  /* interpolate LSF */
38  WebRtcIlbcfix_Interpolate(lsftmp, lsf1, lsf2, coef, length);
39
40  /* Compute the filter coefficients from the LSF */
41  WebRtcIlbcfix_Lsf2Poly(a, lsftmp);
42}
43