Convert media constants to constexpr.

media/formats/mp2t/es_parser_adts.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_adts.h"
 
 #include <stddef.h>
 
 #include <vector>
 
@@ skipping 111 matching lines @@
   AdtsFrame adts_frame;
   while (LookForAdtsFrame(&adts_frame)) {
     // Update the audio configuration if needed.
     DCHECK_GE(adts_frame.size, kADTSHeaderMinSize);
     if (!UpdateAudioConfiguration(adts_frame.data))
       return false;
 
     // Get the PTS & the duration of this access unit.
     TimingDesc current_timing_desc =
         GetTimingDescriptor(adts_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";
       SkipAdtsFrame(adts_frame);
       continue;
     }
     base::TimeDelta current_pts = audio_timestamp_helper_->GetTimestamp();
     base::TimeDelta frame_duration =
         audio_timestamp_helper_->GetFrameDuration(kSamplesPerAACFrame);
 
     // Emit an audio frame.
     bool is_key_frame = true;
@@ skipping 43 matching lines @@
     DVLOG(1) << "Channel layout: "
              << ChannelLayoutToString(audio_decoder_config.channel_layout());
 
     // For AAC audio with SBR (Spectral Band Replication) the sampling rate is
     // doubled in ParseAdtsHeader above, but AudioTimestampHelper should still
     // use the original sample rate to compute audio timestamps and durations
     // correctly.
 
     // 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(orig_sample_rate));
       audio_timestamp_helper_->SetBaseTimestamp(base_timestamp);
     } else {
       audio_timestamp_helper_.reset(new AudioTimestampHelper(orig_sample_rate));
     }
     // Audio config notification.
     last_audio_decoder_config_ = audio_decoder_config;
     new_audio_config_cb_.Run(audio_decoder_config);
   }
 
   return true;
 }
 
 }  // namespace mp2t
 }  // namespace media