- initial import

src/libs/webrtc/ilbcfix/lsf_interpolate_to_poly_enc.c

@@ -0,0 +1,50 @@
+/*
+ *  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 "defines.h"
+#include "interpolate.h"
+#include "lsf_to_poly.h"
+
+/*----------------------------------------------------------------*
+ *  lsf interpolator and conversion from lsf to a coefficients
+ *  (subrutine to SimpleInterpolateLSF)
+ *---------------------------------------------------------------*/
+
+void WebRtcIlbcfix_LsfInterpolate2PloyEnc(
+    iLBC_Enc_Inst_t *iLBCenc_inst,
+    /* (i) the encoder state structure */
+    WebRtc_Word16 *a,  /* (o) lpc coefficients Q12 */
+    WebRtc_Word16 *lsf1, /* (i) first set of lsf coefficients Q13 */
+    WebRtc_Word16 *lsf2, /* (i) second set of lsf coefficients Q13 */
+    WebRtc_Word16 coef, /* (i) weighting coefficient to use between
+                           lsf1 and lsf2 Q14 */
+    WebRtc_Word16 length /* (i) length of coefficient vectors */
+                                          ) {
+  /* Stack based */
+  WebRtc_Word16 lsftmp[LPC_FILTERORDER];
+
+  /* Input parameter not used if not using scratch memory */
+  iLBCenc_inst = iLBCenc_inst;
+  /* interpolate LSF */
+  WebRtcIlbcfix_Interpolate(lsftmp, lsf1, lsf2, coef, length);
+
+  /* Compute the filter coefficients from the LSF */
+  WebRtcIlbcfix_Lsf2Poly(a, lsftmp);
+
+  return;
+}