1 /* 2 * Copyright (c) 2017 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 #ifndef MODULES_AUDIO_PROCESSING_AEC3_FFT_BUFFER_H_ 12 #define MODULES_AUDIO_PROCESSING_AEC3_FFT_BUFFER_H_ 13 14 #include <stddef.h> 15 16 #include <vector> 17 18 #include "modules/audio_processing/aec3/fft_data.h" 19 #include "rtc_base/checks.h" 20 21 namespace webrtc { 22 23 // Struct for bundling a circular buffer of FftData objects together with the 24 // read and write indices. 25 struct FftBuffer { 26 FftBuffer(size_t size, size_t num_channels); 27 ~FftBuffer(); 28 IncIndexFftBuffer29 int IncIndex(int index) const { 30 RTC_DCHECK_EQ(buffer.size(), static_cast<size_t>(size)); 31 return index < size - 1 ? index + 1 : 0; 32 } 33 DecIndexFftBuffer34 int DecIndex(int index) const { 35 RTC_DCHECK_EQ(buffer.size(), static_cast<size_t>(size)); 36 return index > 0 ? index - 1 : size - 1; 37 } 38 OffsetIndexFftBuffer39 int OffsetIndex(int index, int offset) const { 40 RTC_DCHECK_GE(buffer.size(), offset); 41 RTC_DCHECK_EQ(buffer.size(), static_cast<size_t>(size)); 42 return (size + index + offset) % size; 43 } 44 UpdateWriteIndexFftBuffer45 void UpdateWriteIndex(int offset) { write = OffsetIndex(write, offset); } IncWriteIndexFftBuffer46 void IncWriteIndex() { write = IncIndex(write); } DecWriteIndexFftBuffer47 void DecWriteIndex() { write = DecIndex(write); } UpdateReadIndexFftBuffer48 void UpdateReadIndex(int offset) { read = OffsetIndex(read, offset); } IncReadIndexFftBuffer49 void IncReadIndex() { read = IncIndex(read); } DecReadIndexFftBuffer50 void DecReadIndex() { read = DecIndex(read); } 51 52 const int size; 53 std::vector<std::vector<FftData>> buffer; 54 int write = 0; 55 int read = 0; 56 }; 57 58 } // namespace webrtc 59 60 #endif // MODULES_AUDIO_PROCESSING_AEC3_FFT_BUFFER_H_ 61