| /* |
| * 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_BwExpand.c |
| |
| ******************************************************************/ |
| |
| #include "defines.h" |
| |
| /*----------------------------------------------------------------* |
| * lpc bandwidth expansion |
| *---------------------------------------------------------------*/ |
| |
| /* The output is in the same domain as the input */ |
| void WebRtcIlbcfix_BwExpand( |
| WebRtc_Word16 *out, /* (o) the bandwidth expanded lpc coefficients */ |
| WebRtc_Word16 *in, /* (i) the lpc coefficients before bandwidth |
| expansion */ |
| WebRtc_Word16 *coef, /* (i) the bandwidth expansion factor Q15 */ |
| WebRtc_Word16 length /* (i) the length of lpc coefficient vectors */ |
| ) { |
| int i; |
| |
| out[0] = in[0]; |
| for (i = 1; i < length; i++) { |
| /* out[i] = coef[i] * in[i] with rounding. |
| in[] and out[] are in Q12 and coef[] is in Q15 |
| */ |
| out[i] = (WebRtc_Word16)((WEBRTC_SPL_MUL_16_16(coef[i], in[i])+16384)>>15); |
| } |
| } |