support adaptive playback in MSE

media/base/android/media_decoder_job.h

 // Copyright 2013 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_ANDROID_MEDIA_DECODER_JOB_H_
 #define MEDIA_BASE_ANDROID_MEDIA_DECODER_JOB_H_
 
 #include "base/callback.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
@@ skipping 60 matching lines @@
   // this object is waiting for a data request to complete, then this method
   // will wait for the data to arrive and then call the |callback|
   // passed to Decode() with a status of MEDIA_CODEC_STOPPED. This ensures that
   // the |callback| passed to Decode() is always called and the status
   // reflects whether data was actually decoded or the decode terminated early.
   void StopDecode();
 
   // Flushes the decoder and abandons all the data that is being decoded.
   virtual void Flush();
 
-  // Enter prerolling state. The job must not currently be decoding.
+  // Enters prerolling state. The job must not currently be decoding.
   void BeginPrerolling(base::TimeDelta preroll_timestamp);
 
   // Releases all the decoder resources as the current tab is going background.
   virtual void ReleaseDecoderResources();
 
   // Sets the demuxer configs. Returns true if configs has changed, or false
   // otherwise.
   bool SetDemuxerConfigs(const DemuxerConfigs& configs);
 
   // Returns whether the decoder has finished decoding all the data.
@@ skipping 130 matching lines @@
 
   // Implemented by the child class to create |media_codec_bridge_| for a
   // particular stream. Returns true if it is created, or false otherwise.
   virtual bool CreateMediaCodecBridgeInternal() = 0;
 
   // Returns true if the |configs| doesn't match the current demuxer configs
   // the decoder job has.
   virtual bool AreDemuxerConfigsChanged(
       const DemuxerConfigs& configs) const = 0;
 
-  // Update the demuxer configs.
+  // Updates the demuxer configs.
   virtual void UpdateDemuxerConfigs(const DemuxerConfigs& configs) = 0;
 
+  // Returns true if |media_codec_bridge_| needs to be reconfigured for the
+  // new DemuxerConfigs, or false otherwise.
+  virtual bool IsCodecReconfigureNeeded(const DemuxerConfigs& configs) const;
+
   // Return the index to |received_data_| that is not currently being decoded.
   size_t inactive_demuxer_data_index() const {
     return 1 - current_demuxer_data_index_;
   }
 
   // The UI message loop where callbacks should be dispatched.
   scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;
 
   // The task runner that decoder job runs on.
   scoped_refptr<base::SingleThreadTaskRunner> decoder_task_runner_;
@@ skipping 90 matching lines @@
   // This access unit is passed to the decoder during config changes to drain
   // the decoder.
   AccessUnit eos_unit_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(MediaDecoderJob);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_ANDROID_MEDIA_DECODER_JOB_H_