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| 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 "webrtc/modules/audio_processing/aec3/block_framer.h" |
| 12 |
| 13 #include <algorithm> |
| 14 |
| 15 #include "webrtc/base/checks.h" |
| 16 |
| 17 namespace webrtc { |
| 18 |
| 19 BlockFramer::BlockFramer(size_t num_bands) |
| 20 : num_bands_(num_bands), |
| 21 buffer_(num_bands_, std::vector<float>(kBlockSize, 0.f)) {} |
| 22 |
| 23 BlockFramer::~BlockFramer() = default; |
| 24 |
| 25 // All the constants are chosen so that the buffer is either empty or has enough |
| 26 // samples for InsertBlockAndExtractSubFrame to produce a frame. In order to |
| 27 // achieve this, the InsertBlockAndExtractSubFrame and InsertBlock methods need |
| 28 // to be called in the correct order. |
| 29 void BlockFramer::InsertBlock(const std::vector<std::vector<float>>& block) { |
| 30 RTC_DCHECK_EQ(num_bands_, block.size()); |
| 31 for (size_t i = 0; i < num_bands_; ++i) { |
| 32 RTC_DCHECK_EQ(kBlockSize, block[i].size()); |
| 33 RTC_DCHECK_EQ(0, buffer_[i].size()); |
| 34 buffer_[i].insert(buffer_[i].begin(), block[i].begin(), block[i].end()); |
| 35 } |
| 36 } |
| 37 |
| 38 void BlockFramer::InsertBlockAndExtractSubFrame( |
| 39 const std::vector<std::vector<float>>& block, |
| 40 std::vector<rtc::ArrayView<float>>* sub_frame) { |
| 41 RTC_DCHECK(sub_frame); |
| 42 RTC_DCHECK_EQ(num_bands_, block.size()); |
| 43 RTC_DCHECK_EQ(num_bands_, sub_frame->size()); |
| 44 for (size_t i = 0; i < num_bands_; ++i) { |
| 45 RTC_DCHECK_LE(kSubFrameLength, buffer_[i].size() + kBlockSize); |
| 46 RTC_DCHECK_EQ(kBlockSize, block[i].size()); |
| 47 RTC_DCHECK_GE(kBlockSize, buffer_[i].size()); |
| 48 RTC_DCHECK_EQ(kSubFrameLength, (*sub_frame)[i].size()); |
| 49 const int samples_to_frame = kSubFrameLength - buffer_[i].size(); |
| 50 std::copy(buffer_[i].begin(), buffer_[i].end(), (*sub_frame)[i].begin()); |
| 51 std::copy(block[i].begin(), block[i].begin() + samples_to_frame, |
| 52 (*sub_frame)[i].begin() + buffer_[i].size()); |
| 53 buffer_[i].clear(); |
| 54 buffer_[i].insert(buffer_[i].begin(), block[i].begin() + samples_to_frame, |
| 55 block[i].end()); |
| 56 } |
| 57 } |
| 58 |
| 59 } // namespace webrtc |
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