Revert r180578, r180591, and r180604 from 1410 branch.

media/base/filter_collection.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_FILTER_COLLECTION_H_
 #define MEDIA_BASE_FILTER_COLLECTION_H_
 
 #include <list>
 
 #include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
 #include "media/base/media_export.h"
 
 namespace media {
 
 class AudioDecoder;
 class AudioRenderer;
 class Demuxer;
 class VideoDecoder;
 class VideoRenderer;
 
 // Represents a set of uninitialized demuxer and audio/video decoders and
 // renderers. Used to start a Pipeline object for media playback.
 //
 // TODO(scherkus): Replace FilterCollection with something sensible, see
 // http://crbug.com/110800
 class MEDIA_EXPORT FilterCollection {
  public:
   typedef std::list<scoped_refptr<AudioDecoder> > AudioDecoderList;
   typedef std::list<scoped_refptr<VideoDecoder> > VideoDecoderList;
 
   FilterCollection();
   ~FilterCollection();
 
+  // Demuxer accessor methods.
   void SetDemuxer(const scoped_refptr<Demuxer>& demuxer);
   const scoped_refptr<Demuxer>& GetDemuxer();
 
-  void SetAudioRenderer(scoped_ptr<AudioRenderer> audio_renderer);
-  scoped_ptr<AudioRenderer> GetAudioRenderer();
-
-  void SetVideoRenderer(scoped_ptr<VideoRenderer> video_renderer);
-  scoped_ptr<VideoRenderer> GetVideoRenderer();
+  // Adds a filter to the collection.
+  void AddAudioDecoder(AudioDecoder* audio_decoder);
+  void AddAudioRenderer(AudioRenderer* audio_renderer);
+  void AddVideoRenderer(VideoRenderer* video_renderer);
 
   // Remove remaining filters.
   void Clear();
 
+  // Selects a filter of the specified type from the collection.
+  // If the required filter cannot be found, NULL is returned.
+  // If a filter is returned it is removed from the collection.
+  // Filters are selected in FIFO order.
+  void SelectAudioRenderer(scoped_refptr<AudioRenderer>* out);
+  void SelectVideoRenderer(scoped_refptr<VideoRenderer>* out);
+
   AudioDecoderList* GetAudioDecoders();
   VideoDecoderList* GetVideoDecoders();
 
  private:
   scoped_refptr<Demuxer> demuxer_;
   AudioDecoderList audio_decoders_;
   VideoDecoderList video_decoders_;
-  scoped_ptr<AudioRenderer> audio_renderer_;
-  scoped_ptr<VideoRenderer> video_renderer_;
+  std::list<scoped_refptr<AudioRenderer> > audio_renderers_;
+  std::list<scoped_refptr<VideoRenderer> > video_renderers_;
 
   DISALLOW_COPY_AND_ASSIGN(FilterCollection);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_FILTER_COLLECTION_H_