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/*
* Copyright (c) 2013 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.
*/
#include "modules/audio_processing/transient/wpd_tree.h"
#include <string.h>
#include "modules/audio_processing/transient/wpd_node.h"
#include "rtc_base/checks.h"
namespace webrtc {
WPDTree::WPDTree(size_t data_length,
const float* high_pass_coefficients,
const float* low_pass_coefficients,
size_t coefficients_length,
int levels)
: data_length_(data_length),
levels_(levels),
num_nodes_((1 << (levels + 1)) - 1) {
RTC_DCHECK_GT(data_length, (static_cast<size_t>(1) << levels));
RTC_DCHECK(high_pass_coefficients);
RTC_DCHECK(low_pass_coefficients);
RTC_DCHECK_GT(levels, 0);
// Size is 1 more, so we can use the array as 1-based. nodes_[0] is never
// allocated.
nodes_.reset(new std::unique_ptr<WPDNode>[num_nodes_ + 1]);
// Create the first node
const float kRootCoefficient = 1.f; // Identity Coefficient.
nodes_[1].reset(new WPDNode(data_length, &kRootCoefficient, 1));
// Variables used to create the rest of the nodes.
size_t index = 1;
size_t index_left_child = 0;
size_t index_right_child = 0;
int num_nodes_at_curr_level = 0;
// Branching each node in each level to create its children. The last level is
// not branched (all the nodes of that level are leaves).
for (int current_level = 0; current_level < levels; ++current_level) {
num_nodes_at_curr_level = 1 << current_level;
for (int i = 0; i < num_nodes_at_curr_level; ++i) {
index = (1 << current_level) + i;
// Obtain the index of the current node children.
index_left_child = index * 2;
index_right_child = index_left_child + 1;
nodes_[index_left_child].reset(new WPDNode(nodes_[index]->length() / 2,
low_pass_coefficients,
coefficients_length));
nodes_[index_right_child].reset(new WPDNode(nodes_[index]->length() / 2,
high_pass_coefficients,
coefficients_length));
}
}
}
WPDTree::~WPDTree() {}
WPDNode* WPDTree::NodeAt(int level, int index) {
if (level < 0 || level > levels_ || index < 0 || index >= 1 << level) {
return NULL;
}
return nodes_[(1 << level) + index].get();
}
int WPDTree::Update(const float* data, size_t data_length) {
if (!data || data_length != data_length_) {
return -1;
}
// Update the root node.
int update_result = nodes_[1]->set_data(data, data_length);
if (update_result != 0) {
return -1;
}
// Variables used to update the rest of the nodes.
size_t index = 1;
size_t index_left_child = 0;
size_t index_right_child = 0;
int num_nodes_at_curr_level = 0;
for (int current_level = 0; current_level < levels_; ++current_level) {
num_nodes_at_curr_level = 1 << current_level;
for (int i = 0; i < num_nodes_at_curr_level; ++i) {
index = (1 << current_level) + i;
// Obtain the index of the current node children.
index_left_child = index * 2;
index_right_child = index_left_child + 1;
update_result = nodes_[index_left_child]->Update(nodes_[index]->data(),
nodes_[index]->length());
if (update_result != 0) {
return -1;
}
update_result = nodes_[index_right_child]->Update(
nodes_[index]->data(), nodes_[index]->length());
if (update_result != 0) {
return -1;
}
}
}
return 0;
}
} // namespace webrtc
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