Convert media constants to constexpr.

media/formats/mp2t/es_parser_mpeg1audio.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/formats/mp2t/es_parser_mpeg1audio.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 42 matching lines @@
   Mpeg1AudioFrame mpeg1audio_frame;
   while (LookForMpeg1AudioFrame(&mpeg1audio_frame)) {
     // Update the audio configuration if needed.
     DCHECK_GE(mpeg1audio_frame.size, MPEG1AudioStreamParser::kHeaderSize);
     if (!UpdateAudioConfiguration(mpeg1audio_frame.data))
       return false;
 
     // Get the PTS & the duration of this access unit.
     TimingDesc current_timing_desc =
         GetTimingDescriptor(mpeg1audio_frame.queue_offset);
-    if (current_timing_desc.pts != kNoTimestamp())
+    if (current_timing_desc.pts != kNoTimestamp)
       audio_timestamp_helper_->SetBaseTimestamp(current_timing_desc.pts);
 
-    if (audio_timestamp_helper_->base_timestamp() == kNoTimestamp()) {
+    if (audio_timestamp_helper_->base_timestamp() == kNoTimestamp) {
       DVLOG(1) << "Skipping audio frame with unknown timestamp";
       SkipMpeg1AudioFrame(mpeg1audio_frame);
       continue;
     }
     base::TimeDelta current_pts = audio_timestamp_helper_->GetTimestamp();
     base::TimeDelta frame_duration =
         audio_timestamp_helper_->GetFrameDuration(
             mpeg1audio_frame.sample_count);
 
     // Emit an audio frame.
@@ skipping 95 matching lines @@
   // field for Mpeg1 audio. If yes, we should generate this field.
   AudioDecoderConfig audio_decoder_config(
       kCodecMP3, kSampleFormatS16, header.channel_layout, header.sample_rate,
       EmptyExtraData(), Unencrypted());
 
   if (!audio_decoder_config.Matches(last_audio_decoder_config_)) {
     DVLOG(1) << "Sampling frequency: " << header.sample_rate;
     DVLOG(1) << "Channel layout: " << header.channel_layout;
     // Reset the timestamp helper to use a new time scale.
     if (audio_timestamp_helper_ &&
-        audio_timestamp_helper_->base_timestamp() != kNoTimestamp()) {
+        audio_timestamp_helper_->base_timestamp() != kNoTimestamp) {
       base::TimeDelta base_timestamp = audio_timestamp_helper_->GetTimestamp();
       audio_timestamp_helper_.reset(
         new AudioTimestampHelper(header.sample_rate));
       audio_timestamp_helper_->SetBaseTimestamp(base_timestamp);
     } else {
       audio_timestamp_helper_.reset(
           new AudioTimestampHelper(header.sample_rate));
     }
     // Audio config notification.
     last_audio_decoder_config_ = audio_decoder_config;
     new_audio_config_cb_.Run(audio_decoder_config);
   }
 
   return true;
 }
 
 void EsParserMpeg1Audio::SkipMpeg1AudioFrame(
     const Mpeg1AudioFrame& mpeg1audio_frame) {
   DCHECK_EQ(mpeg1audio_frame.queue_offset, es_queue_->head());
   es_queue_->Pop(mpeg1audio_frame.size);
 }
 
 }  // namespace mp2t
 }  // namespace media