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/block_framer.h"
12
13 #include <algorithm>
14
15 #include "modules/audio_processing/aec3/aec3_common.h"
16 #include "rtc_base/checks.h"
17
18 namespace webrtc {
19
BlockFramer(size_t num_bands,size_t num_channels)20 BlockFramer::BlockFramer(size_t num_bands, size_t num_channels)
21 : num_bands_(num_bands),
22 num_channels_(num_channels),
23 buffer_(num_bands_,
24 std::vector<std::vector<float>>(
25 num_channels,
26 std::vector<float>(kBlockSize, 0.f))) {
27 RTC_DCHECK_LT(0, num_bands);
28 RTC_DCHECK_LT(0, num_channels);
29 }
30
31 BlockFramer::~BlockFramer() = default;
32
33 // All the constants are chosen so that the buffer is either empty or has enough
34 // samples for InsertBlockAndExtractSubFrame to produce a frame. In order to
35 // achieve this, the InsertBlockAndExtractSubFrame and InsertBlock methods need
36 // to be called in the correct order.
InsertBlock(const Block & block)37 void BlockFramer::InsertBlock(const Block& block) {
38 RTC_DCHECK_EQ(num_bands_, block.NumBands());
39 RTC_DCHECK_EQ(num_channels_, block.NumChannels());
40 for (size_t band = 0; band < num_bands_; ++band) {
41 for (size_t channel = 0; channel < num_channels_; ++channel) {
42 RTC_DCHECK_EQ(0, buffer_[band][channel].size());
43
44 buffer_[band][channel].insert(buffer_[band][channel].begin(),
45 block.begin(band, channel),
46 block.end(band, channel));
47 }
48 }
49 }
50
InsertBlockAndExtractSubFrame(const Block & block,std::vector<std::vector<rtc::ArrayView<float>>> * sub_frame)51 void BlockFramer::InsertBlockAndExtractSubFrame(
52 const Block& block,
53 std::vector<std::vector<rtc::ArrayView<float>>>* sub_frame) {
54 RTC_DCHECK(sub_frame);
55 RTC_DCHECK_EQ(num_bands_, block.NumBands());
56 RTC_DCHECK_EQ(num_channels_, block.NumChannels());
57 RTC_DCHECK_EQ(num_bands_, sub_frame->size());
58 for (size_t band = 0; band < num_bands_; ++band) {
59 RTC_DCHECK_EQ(num_channels_, (*sub_frame)[0].size());
60 for (size_t channel = 0; channel < num_channels_; ++channel) {
61 RTC_DCHECK_LE(kSubFrameLength,
62 buffer_[band][channel].size() + kBlockSize);
63 RTC_DCHECK_GE(kBlockSize, buffer_[band][channel].size());
64 RTC_DCHECK_EQ(kSubFrameLength, (*sub_frame)[band][channel].size());
65
66 const int samples_to_frame =
67 kSubFrameLength - buffer_[band][channel].size();
68 std::copy(buffer_[band][channel].begin(), buffer_[band][channel].end(),
69 (*sub_frame)[band][channel].begin());
70 std::copy(
71 block.begin(band, channel),
72 block.begin(band, channel) + samples_to_frame,
73 (*sub_frame)[band][channel].begin() + buffer_[band][channel].size());
74 buffer_[band][channel].clear();
75 buffer_[band][channel].insert(
76 buffer_[band][channel].begin(),
77 block.begin(band, channel) + samples_to_frame,
78 block.end(band, channel));
79 }
80 }
81 }
82
83 } // namespace webrtc
84