downsampled_render_buffer.h (1852B)
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_DOWNSAMPLED_RENDER_BUFFER_H_ 12 #define MODULES_AUDIO_PROCESSING_AEC3_DOWNSAMPLED_RENDER_BUFFER_H_ 13 14 #include <stddef.h> 15 16 #include <vector> 17 18 #include "rtc_base/checks.h" 19 20 namespace webrtc { 21 22 // Holds the circular buffer of the downsampled render data. 23 struct DownsampledRenderBuffer { 24 explicit DownsampledRenderBuffer(size_t downsampled_buffer_size); 25 ~DownsampledRenderBuffer(); 26 27 int IncIndex(int index) const { 28 RTC_DCHECK_EQ(buffer.size(), static_cast<size_t>(size)); 29 return index < size - 1 ? index + 1 : 0; 30 } 31 32 int DecIndex(int index) const { 33 RTC_DCHECK_EQ(buffer.size(), static_cast<size_t>(size)); 34 return index > 0 ? index - 1 : size - 1; 35 } 36 37 int OffsetIndex(int index, int offset) const { 38 RTC_DCHECK_GE(buffer.size(), offset); 39 RTC_DCHECK_EQ(buffer.size(), static_cast<size_t>(size)); 40 return (size + index + offset) % size; 41 } 42 43 void UpdateWriteIndex(int offset) { write = OffsetIndex(write, offset); } 44 void IncWriteIndex() { write = IncIndex(write); } 45 void DecWriteIndex() { write = DecIndex(write); } 46 void UpdateReadIndex(int offset) { read = OffsetIndex(read, offset); } 47 void IncReadIndex() { read = IncIndex(read); } 48 void DecReadIndex() { read = DecIndex(read); } 49 50 const int size; 51 std::vector<float> buffer; 52 int write = 0; 53 int read = 0; 54 }; 55 56 } // namespace webrtc 57 58 #endif // MODULES_AUDIO_PROCESSING_AEC3_DOWNSAMPLED_RENDER_BUFFER_H_