| /* |
| * 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_Interpolate.c |
| |
| ******************************************************************/ |
| |
| #include "defines.h" |
| #include "constants.h" |
| |
| /*----------------------------------------------------------------* |
| * interpolation between vectors |
| *---------------------------------------------------------------*/ |
| |
| void WebRtcIlbcfix_Interpolate( |
| WebRtc_Word16 *out, /* (o) output vector */ |
| WebRtc_Word16 *in1, /* (i) first input vector */ |
| WebRtc_Word16 *in2, /* (i) second input vector */ |
| WebRtc_Word16 coef, /* (i) weight coefficient in Q14 */ |
| WebRtc_Word16 length) /* (i) number of sample is vectors */ |
| { |
| int i; |
| WebRtc_Word16 invcoef; |
| |
| /* |
| Performs the operation out[i] = in[i]*coef + (1-coef)*in2[i] (with rounding) |
| */ |
| |
| invcoef = 16384 - coef; /* 16384 = 1.0 (Q14)*/ |
| for (i = 0; i < length; i++) { |
| out[i] = (WebRtc_Word16) WEBRTC_SPL_RSHIFT_W32( |
| (WEBRTC_SPL_MUL_16_16(coef, in1[i]) + WEBRTC_SPL_MUL_16_16(invcoef, in2[i]))+8192, |
| 14); |
| } |
| |
| return; |
| } |