Introducing DemuxerHost::OnMetadata.

media/base/demuxer.h

 // Copyright (c) 2012 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.
 
 #ifndef MEDIA_BASE_DEMUXER_H_
 #define MEDIA_BASE_DEMUXER_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "media/base/data_source.h"
 #include "media/base/demuxer_stream.h"
 #include "media/base/demuxer_stream_provider.h"
 #include "media/base/eme_constants.h"
 #include "media/base/media_export.h"
 #include "media/base/media_track.h"
+#include "media/base/pipeline_metadata.h"
 #include "media/base/pipeline_status.h"
 #include "media/base/ranges.h"
 
 namespace media {
 
 class TextTrackConfig;
 class MediaTracks;
 
 class MEDIA_EXPORT DemuxerHost {
  public:
+  // Executed when the content metadata is known.
+  virtual void OnMetadata(PipelineMetadata metadata) = 0;
+
   // Notify the host that buffered time ranges have changed. Note that buffered
   // time ranges can grow (when new media data is appended), but they can also
   // shrink (when buffering reaches limit capacity and some buffered data
   // becomes evicted, e.g. due to MSE GC algorithm, or by explicit removal of
   // ranges directed by MSE web app).
   virtual void OnBufferedTimeRangesChanged(
       const Ranges<base::TimeDelta>& ranges) = 0;
 
   // Sets the duration of the media in microseconds.
   // Duration may be kInfiniteDuration if the duration is not known.
@@ skipping 104 matching lines @@
       const std::vector<MediaTrack::Id>& track_ids,
       base::TimeDelta currTime) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Demuxer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_DEMUXER_H_