Motown: Convert MediaSink to expose MediaTimelineControlSite

services/media/audio/audio_pipe.h

 // Copyright 2015 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 SERVICES_MEDIA_AUDIO_AUDIO_PIPE_H_
 #define SERVICES_MEDIA_AUDIO_AUDIO_PIPE_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 40 matching lines @@
     // TODO(johngro): Reconsider this.  It may be best to keep things expressed
     // simply in media time instead of converting to fractional units of track
     // frames.  If/when outputs move away from a single fixed step size for
     // output sampling, it will probably be best to just convert this back to
     // media time.
     const int64_t& start_pts() const { return start_pts_; }
     const int64_t& end_pts() const { return end_pts_; }
 
     // Accessor for the regions in the shared buffer which contain the actual
     // sample data.
-    const std::vector<Region>& regions() const { return  regions_; }
+    const std::vector<Region>& regions() const { return regions_; }
+
+    uint32_t frame_count() const { return frame_count_; }
+    const MediaPacketStatePtr& state() const { return state_; }
 
    private:
     friend class AudioPipe;
     AudioPacketRef(MediaPacketStatePtr state,
                    AudioServerImpl* server,
                    std::vector<Region>&& regions,  // NOLINT(build/c++11)
                    int64_t start_pts,
-                   int64_t end_pts);
+                   int64_t end_pts,
+                   uint32_t frame_count);
 
     MediaPacketStatePtr state_;
     AudioServerImpl* server_;
 
     std::vector<Region> regions_;
     int64_t start_pts_;
     int64_t end_pts_;
+    uint32_t frame_count_;
   };
 
   AudioPipe(AudioTrackImpl* owner, AudioServerImpl* server);
   ~AudioPipe() override;
 
  protected:
   void OnPacketReceived(MediaPacketStatePtr state) override;
   void OnPrimeRequested(const PrimeCallback& cbk) override;
   bool OnFlushRequested(const FlushCallback& cbk) override;
 
  private:
   AudioTrackImpl* owner_;
   AudioServerImpl* server_;
 
   // State used for timestamp interpolation
   bool next_pts_known_ = 0;
   int64_t next_pts_;
 
   PrimeCallback prime_callback_;
 };
 
 }  // namespace audio
 }  // namespace media
 }  // namespace mojo
 
 #endif  // SERVICES_MEDIA_AUDIO_AUDIO_PIPE_H_