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_LsfInterpolate2PloyEnc.c 16 17 ******************************************************************/ 18 19 #include "defines.h" 20 #include "interpolate.h" 21 #include "lsf_to_poly.h" 22 23 /*----------------------------------------------------------------* 24 * lsf interpolator and conversion from lsf to a coefficients 25 * (subrutine to SimpleInterpolateLSF) 26 *---------------------------------------------------------------*/ 27 28 void WebRtcIlbcfix_LsfInterpolate2PloyEnc( 29 int16_t *a, /* (o) lpc coefficients Q12 */ 30 int16_t *lsf1, /* (i) first set of lsf coefficients Q13 */ 31 int16_t *lsf2, /* (i) second set of lsf coefficients Q13 */ 32 int16_t coef, /* (i) weighting coefficient to use between 33 lsf1 and lsf2 Q14 */ 34 int16_t length /* (i) length of coefficient vectors */ 35 ) { 36 /* Stack based */ 37 int16_t lsftmp[LPC_FILTERORDER]; 38 39 /* interpolate LSF */ 40 WebRtcIlbcfix_Interpolate(lsftmp, lsf1, lsf2, coef, length); 41 42 /* Compute the filter coefficients from the LSF */ 43 WebRtcIlbcfix_Lsf2Poly(a, lsftmp); 44 45 return; 46 } 47
