1 /* 2 * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include "webrtc/modules/audio_processing/transient/wpd_node.h" 12 13 #include <assert.h> 14 #include <math.h> 15 #include <string.h> 16 17 #include "webrtc/base/scoped_ptr.h" 18 #include "webrtc/common_audio/fir_filter.h" 19 #include "webrtc/modules/audio_processing/transient/dyadic_decimator.h" 20 21 namespace webrtc { 22 23 WPDNode::WPDNode(size_t length, 24 const float* coefficients, 25 size_t coefficients_length) 26 : // The data buffer has parent data length to be able to contain and filter 27 // it. 28 data_(new float[2 * length + 1]), 29 length_(length), 30 filter_(FIRFilter::Create(coefficients, 31 coefficients_length, 32 2 * length + 1)) { 33 assert(length > 0 && coefficients && coefficients_length > 0); 34 memset(data_.get(), 0.f, (2 * length + 1) * sizeof(data_[0])); 35 } 36 37 WPDNode::~WPDNode() {} 38 39 int WPDNode::Update(const float* parent_data, size_t parent_data_length) { 40 if (!parent_data || (parent_data_length / 2) != length_) { 41 return -1; 42 } 43 44 // Filter data. 45 filter_->Filter(parent_data, parent_data_length, data_.get()); 46 47 // Decimate data. 48 const bool kOddSequence = true; 49 size_t output_samples = DyadicDecimate( 50 data_.get(), parent_data_length, kOddSequence, data_.get(), length_); 51 if (output_samples != length_) { 52 return -1; 53 } 54 55 // Get abs to all values. 56 for (size_t i = 0; i < length_; ++i) { 57 data_[i] = fabs(data_[i]); 58 } 59 60 return 0; 61 } 62 63 int WPDNode::set_data(const float* new_data, size_t length) { 64 if (!new_data || length != length_) { 65 return -1; 66 } 67 memcpy(data_.get(), new_data, length * sizeof(data_[0])); 68 return 0; 69 } 70 71 } // namespace webrtc 72
