Fix audio keyframe comment in MSE MP4 parser

media/formats/mp4/track_run_iterator.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/mp4/track_run_iterator.h"
 
 #include <algorithm>
 #include <iomanip>
 #include <limits>
 #include <memory>
@@ skipping 151 matching lines @@
     MEDIA_LOG(ERROR, media_log) << "Reserved value used in sample dependency"
                                    " info.";
     return false;
   }
 
   // Per spec (ISO 14496-12:2012), the definition for a "sync sample" is
   // equivalent to the downstream code's "is keyframe" concept. But media exists
   // that marks non-key video frames as sync samples (http://crbug.com/507916
   // and http://crbug.com/310712). Hence, for video we additionally check that
   // the sample does not depend on others (FFmpeg does too, see mov_read_trun).
-  // Sample dependency is not ignored for audio because encoded audio samples
-  // can depend on other samples and still be used for random access. Generally
-  // all audio samples are expected to be sync samples, but we  prefer to check
-  // the flags to catch badly muxed audio (for now anyway ;P). History of
-  // attempts to get this right discussed in http://crrev.com/1319813002
+  // Sample dependency is ignored for audio because encoded audio samples can
+  // depend on other samples and still be used for random access. Generally all
+  // audio samples are expected to be sync samples, but we  prefer to check the
+  // flags to catch badly muxed audio (for now anyway ;P). History of attempts
+  // to get this right discussed in http://crrev.com/1319813002
   bool sample_is_sync_sample = !(flags & kSampleIsNonSyncSample);
   bool sample_depends_on_others = sample_depends_on == kSampleDependsOnOthers;
   sample_info->is_keyframe = sample_is_sync_sample &&
                              (!sample_depends_on_others || is_audio);
 
   DVLOG(4) << __func__ << " is_kf:" << sample_info->is_keyframe
            << " is_sync:" << sample_is_sync_sample
            << " deps:" << sample_depends_on_others << " audio:" << is_audio;
 
   return true;
@@ skipping 524 matching lines @@
       index == 0 ? track_encryption().default_constant_iv
                  : GetSampleEncryptionInfoEntry(*run_itr_, index)->constant_iv;
   RCHECK(constant_iv != nullptr);
   memcpy(entry->initialization_vector, constant_iv, kInitializationVectorSize);
   return true;
 }
 #endif
 
 }  // namespace mp4
 }  // namespace media