Convert media constants to constexpr.

media/base/audio_buffer_converter.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/base/audio_buffer_converter.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/logging.h"
@@ skipping 38 matching lines @@
   // We'll need a new |audio_converter_| if there was a config change.
   if (IsConfigChange(input_params_, buffer))
     ResetConverter(buffer);
 
   // Pass straight through if there's no work to be done.
   if (!audio_converter_) {
     queued_outputs_.push_back(buffer);
     return;
   }
 
-  if (timestamp_helper_.base_timestamp() == kNoTimestamp())
+  if (timestamp_helper_.base_timestamp() == kNoTimestamp)
     timestamp_helper_.SetBaseTimestamp(buffer->timestamp());
 
   queued_inputs_.push_back(buffer);
   input_frames_ += buffer->frame_count();
 
   ConvertIfPossible();
 }
 
 bool AudioBufferConverter::HasNextBuffer() { return !queued_outputs_.empty(); }
 
 scoped_refptr<AudioBuffer> AudioBufferConverter::GetNextBuffer() {
   DCHECK(!queued_outputs_.empty());
   scoped_refptr<AudioBuffer> out = queued_outputs_.front();
   queued_outputs_.pop_front();
   return out;
 }
 
 void AudioBufferConverter::Reset() {
   audio_converter_.reset();
   queued_inputs_.clear();
   queued_outputs_.clear();
-  timestamp_helper_.SetBaseTimestamp(kNoTimestamp());
+  timestamp_helper_.SetBaseTimestamp(kNoTimestamp);
   input_params_ = output_params_;
   input_frames_ = 0;
   buffered_input_frames_ = 0.0;
   last_input_buffer_offset_ = 0;
 }
 
 void AudioBufferConverter::ResetTimestampState() {
   Flush();
-  timestamp_helper_.SetBaseTimestamp(kNoTimestamp());
+  timestamp_helper_.SetBaseTimestamp(kNoTimestamp);
 }
 
 double AudioBufferConverter::ProvideInput(AudioBus* audio_bus,
                                           uint32_t frames_delayed) {
   DCHECK(is_flushing_ || input_frames_ >= audio_bus->frames());
 
   int requested_frames_left = audio_bus->frames();
   int dest_index = 0;
 
   while (requested_frames_left > 0 && !queued_inputs_.empty()) {
@@ skipping 139 matching lines @@
   is_flushing_ = false;
   audio_converter_->Reset();
   DCHECK_EQ(input_frames_, 0);
   DCHECK_EQ(last_input_buffer_offset_, 0);
   DCHECK_LT(buffered_input_frames_, 1.0);
   DCHECK(queued_inputs_.empty());
   buffered_input_frames_ = 0.0;
 }
 
 }  // namespace media