| /* |
| * 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. |
| */ |
| |
| |
| /* |
| * This file contains the function WebRtcSpl_GetScalingSquare(). |
| * The description header can be found in signal_processing_library.h |
| * |
| */ |
| |
| #include "signal_processing_library.h" |
| |
| int WebRtcSpl_GetScalingSquare(WebRtc_Word16 *in_vector, int in_vector_length, int times) |
| { |
| int nbits = WebRtcSpl_GetSizeInBits(times); |
| int i; |
| WebRtc_Word16 smax = -1; |
| WebRtc_Word16 sabs; |
| WebRtc_Word16 *sptr = in_vector; |
| int t; |
| int looptimes = in_vector_length; |
| |
| for (i = looptimes; i > 0; i--) |
| { |
| sabs = (*sptr > 0 ? *sptr++ : -*sptr++); |
| smax = (sabs > smax ? sabs : smax); |
| } |
| t = WebRtcSpl_NormW32(WEBRTC_SPL_MUL(smax, smax)); |
| |
| if (smax == 0) |
| { |
| return 0; // Since norm(0) returns 0 |
| } else |
| { |
| return (t > nbits) ? 0 : nbits - t; |
| } |
| } |