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/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
/******************************************************************
iLBC Speech Coder ANSI-C Source Code
WebRtcIlbcfix_LsfInterpolate2PloyEnc.c
******************************************************************/
#include "modules/audio_coding/codecs/ilbc/lsf_interpolate_to_poly_enc.h"
#include "modules/audio_coding/codecs/ilbc/defines.h"
#include "modules/audio_coding/codecs/ilbc/interpolate.h"
#include "modules/audio_coding/codecs/ilbc/lsf_to_poly.h"
/*----------------------------------------------------------------*
* lsf interpolator and conversion from lsf to a coefficients
* (subrutine to SimpleInterpolateLSF)
*---------------------------------------------------------------*/
void WebRtcIlbcfix_LsfInterpolate2PloyEnc(
int16_t *a, /* (o) lpc coefficients Q12 */
int16_t *lsf1, /* (i) first set of lsf coefficients Q13 */
int16_t *lsf2, /* (i) second set of lsf coefficients Q13 */
int16_t coef, /* (i) weighting coefficient to use between
lsf1 and lsf2 Q14 */
int16_t length /* (i) length of coefficient vectors */
) {
/* Stack based */
int16_t lsftmp[LPC_FILTERORDER];
/* interpolate LSF */
WebRtcIlbcfix_Interpolate(lsftmp, lsf1, lsf2, coef, length);
/* Compute the filter coefficients from the LSF */
WebRtcIlbcfix_Lsf2Poly(a, lsftmp);
return;
}
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