1 /*
2 * Copyright (c) 2016 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 "modules/audio_processing/aec3/frame_blocker.h"
12
13 #include <algorithm>
14
15 #include "rtc_base/checks.h"
16
17 namespace webrtc {
18
FrameBlocker(size_t num_bands)19 FrameBlocker::FrameBlocker(size_t num_bands)
20 : num_bands_(num_bands), buffer_(num_bands_) {
21 for (auto& b : buffer_) {
22 b.reserve(kBlockSize);
23 RTC_DCHECK(b.empty());
24 }
25 }
26
27 FrameBlocker::~FrameBlocker() = default;
28
InsertSubFrameAndExtractBlock(const std::vector<rtc::ArrayView<float>> & sub_frame,std::vector<std::vector<float>> * block)29 void FrameBlocker::InsertSubFrameAndExtractBlock(
30 const std::vector<rtc::ArrayView<float>>& sub_frame,
31 std::vector<std::vector<float>>* block) {
32 RTC_DCHECK(block);
33 RTC_DCHECK_EQ(num_bands_, block->size());
34 RTC_DCHECK_EQ(num_bands_, sub_frame.size());
35 for (size_t i = 0; i < num_bands_; ++i) {
36 RTC_DCHECK_GE(kBlockSize - 16, buffer_[i].size());
37 RTC_DCHECK_EQ(kBlockSize, (*block)[i].size());
38 RTC_DCHECK_EQ(kSubFrameLength, sub_frame[i].size());
39 const int samples_to_block = kBlockSize - buffer_[i].size();
40 (*block)[i].clear();
41 (*block)[i].insert((*block)[i].begin(), buffer_[i].begin(),
42 buffer_[i].end());
43 (*block)[i].insert((*block)[i].begin() + buffer_[i].size(),
44 sub_frame[i].begin(),
45 sub_frame[i].begin() + samples_to_block);
46 buffer_[i].clear();
47 buffer_[i].insert(buffer_[i].begin(),
48 sub_frame[i].begin() + samples_to_block,
49 sub_frame[i].end());
50 }
51 }
52
IsBlockAvailable() const53 bool FrameBlocker::IsBlockAvailable() const {
54 return kBlockSize == buffer_[0].size();
55 }
56
ExtractBlock(std::vector<std::vector<float>> * block)57 void FrameBlocker::ExtractBlock(std::vector<std::vector<float>>* block) {
58 RTC_DCHECK(block);
59 RTC_DCHECK_EQ(num_bands_, block->size());
60 RTC_DCHECK(IsBlockAvailable());
61 for (size_t i = 0; i < num_bands_; ++i) {
62 RTC_DCHECK_EQ(kBlockSize, buffer_[i].size());
63 RTC_DCHECK_EQ(kBlockSize, (*block)[i].size());
64 (*block)[i].clear();
65 (*block)[i].insert((*block)[i].begin(), buffer_[i].begin(),
66 buffer_[i].end());
67 buffer_[i].clear();
68 }
69 }
70
71 } // namespace webrtc
72