Replace Clock with timeutils in AudioEncoder.

webrtc/common_audio/smoothing_filter.cc

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "webrtc/common_audio/smoothing_filter.h"
 
 #include <cmath>
 
+#include "webrtc/base/timeutils.h"
+
 namespace webrtc {
 
-SmoothingFilterImpl::SmoothingFilterImpl(int init_time_ms, const Clock* clock)
+SmoothingFilterImpl::SmoothingFilterImpl(int init_time_ms)
     : init_time_ms_(init_time_ms),
       // Duing the initalization time, we use an increasing alpha. Specifically,
       //   alpha(n) = exp(-powf(init_factor_, n)),
       // where |init_factor_| is chosen such that
       //   alpha(init_time_ms_) = exp(-1.0f / init_time_ms_),
-      init_factor_(init_time_ms_ == 0 ? 0.0f : powf(init_time_ms_,
-                                                    -1.0f / init_time_ms_)),
+      init_factor_(init_time_ms_ == 0
+                       ? 0.0f
+                       : powf(init_time_ms_, -1.0f / init_time_ms_)),
       // |init_const_| is to a factor to help the calculation during
       // initialization phase.
       init_const_(init_time_ms_ == 0
                       ? 0.0f
                       : init_time_ms_ -
-                            powf(init_time_ms_, 1.0f - 1.0f / init_time_ms_)),
-      clock_(clock) {
+                            powf(init_time_ms_, 1.0f - 1.0f / init_time_ms_)) {
   UpdateAlpha(init_time_ms_);
 }
 
 SmoothingFilterImpl::~SmoothingFilterImpl() = default;
 
 void SmoothingFilterImpl::AddSample(float sample) {
-  const int64_t now_ms = clock_->TimeInMilliseconds();
+  const int64_t now_ms = rtc::TimeMillis();
 
   if (!init_end_time_ms_) {
     // This is equivalent to assuming the filter has been receiving the same
     // value as the first sample since time -infinity.
     state_ = last_sample_ = sample;
     init_end_time_ms_ = rtc::Optional<int64_t>(now_ms + init_time_ms_);
     last_state_time_ms_ = now_ms;
     return;
   }
 
   ExtrapolateLastSample(now_ms);
   last_sample_ = sample;
 }
 
 rtc::Optional<float> SmoothingFilterImpl::GetAverage() {
   if (!init_end_time_ms_) {
     // |init_end_time_ms_| undefined since we have not received any sample.
     return rtc::Optional<float>();
   }
-  ExtrapolateLastSample(clock_->TimeInMilliseconds());
+  ExtrapolateLastSample(rtc::TimeMillis());
   return rtc::Optional<float>(state_);
 }
 
 bool SmoothingFilterImpl::SetTimeConstantMs(int time_constant_ms) {
   if (!init_end_time_ms_ || last_state_time_ms_ < *init_end_time_ms_) {
     return false;
   }
   UpdateAlpha(time_constant_ms);
   return true;
 }
@@ skipping 64 matching lines @@
 //        \end{cases}
 //   \end{align}
 // We know $\gamma = T^{-\frac{1}{T}}$, where $T$ denotes init\_time\_ms\_. Then
 // $1 - \gamma$ approaches zero when $T$ increases. This can cause numerical
 // difficulties. We multiply $T$ (if $T > 0$) to both numerator and denominator
 // in the fraction. See.
 //   \begin{align}
 //     \frac{\gamma^m - \gamma^n}{1 - \gamma}
 //     &= \frac{T^\frac{T-m}{T} - T^\frac{T-n}{T}}{T - T^{1-\frac{1}{T}}}
 //   \end{align}