Revert of MSE: Relax the 'media segment must begin with keyframe' requirement

media/formats/mp4/mp4_stream_parser.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/mp4_stream_parser.h"
 
 #include <stddef.h>
 #include <limits>
 #include <utility>
 #include <vector>
@@ skipping 44 matching lines @@
     const EncryptedMediaInitDataCB& encrypted_media_init_data_cb,
     const NewMediaSegmentCB& new_segment_cb,
     const EndMediaSegmentCB& end_of_segment_cb,
     const scoped_refptr<MediaLog>& media_log) {
   DCHECK_EQ(state_, kWaitingForInit);
   DCHECK(init_cb_.is_null());
   DCHECK(!init_cb.is_null());
   DCHECK(!config_cb.is_null());
   DCHECK(!new_buffers_cb.is_null());
   DCHECK(!encrypted_media_init_data_cb.is_null());
-  DCHECK(!new_segment_cb.is_null());
   DCHECK(!end_of_segment_cb.is_null());
 
   ChangeState(kParsingBoxes);
   init_cb_ = init_cb;
   config_cb_ = config_cb;
   new_buffers_cb_ = new_buffers_cb;
   encrypted_media_init_data_cb_ = encrypted_media_init_data_cb;
   new_segment_cb_ = new_segment_cb;
   end_of_segment_cb_ = end_of_segment_cb;
   media_log_ = media_log;
@@ skipping 361 matching lines @@
   return true;
 }
 
 bool MP4StreamParser::EnqueueSample(BufferQueue* audio_buffers,
                                     BufferQueue* video_buffers,
                                     bool* err) {
   DCHECK_EQ(state_, kEmittingSamples);
 
   if (!runs_->IsRunValid()) {
     // Flush any buffers we've gotten in this chunk so that buffers don't
-    // cross |new_segment_cb_| calls
+    // cross NewSegment() calls
     *err = !SendAndFlushSamples(audio_buffers, video_buffers);
     if (*err)
       return false;
 
     // Remain in kEmittingSamples state, discarding data, until the end of
     // the current 'mdat' box has been appended to the queue.
     if (!queue_.Trim(mdat_tail_))
       return false;
 
     ChangeState(kParsingBoxes);
@@ skipping 198 matching lines @@
       runs.AdvanceSample();
     }
     runs.AdvanceRun();
   }
 
   return true;
 }
 
 }  // namespace mp4
 }  // namespace media