tor-browser

The Tor Browser
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saturation_protector_buffer.cc (2045B)

      1 /*
      2 *  Copyright (c) 2021 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/agc2/saturation_protector_buffer.h"
     12 
     13 #include <optional>
     14 
     15 #include "rtc_base/checks.h"
     16 #include "rtc_base/numerics/safe_compare.h"
     17 
     18 namespace webrtc {
     19 
     20 SaturationProtectorBuffer::SaturationProtectorBuffer() = default;
     21 
     22 SaturationProtectorBuffer::~SaturationProtectorBuffer() = default;
     23 
     24 bool SaturationProtectorBuffer::operator==(
     25    const SaturationProtectorBuffer& b) const {
     26  RTC_DCHECK_LE(size_, buffer_.size());
     27  RTC_DCHECK_LE(b.size_, b.buffer_.size());
     28  if (size_ != b.size_) {
     29    return false;
     30  }
     31  for (int i = 0, i0 = FrontIndex(), i1 = b.FrontIndex(); i < size_;
     32       ++i, ++i0, ++i1) {
     33    if (buffer_[i0 % buffer_.size()] != b.buffer_[i1 % b.buffer_.size()]) {
     34      return false;
     35    }
     36  }
     37  return true;
     38 }
     39 
     40 int SaturationProtectorBuffer::Capacity() const {
     41  return buffer_.size();
     42 }
     43 
     44 int SaturationProtectorBuffer::Size() const {
     45  return size_;
     46 }
     47 
     48 void SaturationProtectorBuffer::Reset() {
     49  next_ = 0;
     50  size_ = 0;
     51 }
     52 
     53 void SaturationProtectorBuffer::PushBack(float v) {
     54  RTC_DCHECK_GE(next_, 0);
     55  RTC_DCHECK_GE(size_, 0);
     56  RTC_DCHECK_LT(next_, buffer_.size());
     57  RTC_DCHECK_LE(size_, buffer_.size());
     58  buffer_[next_++] = v;
     59  if (SafeEq(next_, buffer_.size())) {
     60    next_ = 0;
     61  }
     62  if (SafeLt(size_, buffer_.size())) {
     63    size_++;
     64  }
     65 }
     66 
     67 std::optional<float> SaturationProtectorBuffer::Front() const {
     68  if (size_ == 0) {
     69    return std::nullopt;
     70  }
     71  RTC_DCHECK_LT(FrontIndex(), buffer_.size());
     72  return buffer_[FrontIndex()];
     73 }
     74 
     75 int SaturationProtectorBuffer::FrontIndex() const {
     76  return SafeEq(size_, buffer_.size()) ? next_ : 0;
     77 }
     78 
     79 }  // namespace webrtc