Refactor PipelineImpl to use CompositeFilter to manage Filter state transitions.

media/base/pipeline.h

 // Copyright (c) 2010 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.
 
 // The pipeline is the public API clients use for playing back media.  Clients
 // provide a filter collection containing the filters they want the pipeline to
 // use to render media.
 
 #ifndef MEDIA_BASE_PIPELINE_H_
 #define MEDIA_BASE_PIPELINE_H_
@@ skipping 15 matching lines @@
   PIPELINE_ERROR_URL_NOT_FOUND,
   PIPELINE_ERROR_NETWORK,
   PIPELINE_ERROR_DECODE,
   PIPELINE_ERROR_ABORT,
   PIPELINE_ERROR_INITIALIZATION_FAILED,
   PIPELINE_ERROR_REQUIRED_FILTER_MISSING,
   PIPELINE_ERROR_OUT_OF_MEMORY,
   PIPELINE_ERROR_COULD_NOT_RENDER,
   PIPELINE_ERROR_READ,
   PIPELINE_ERROR_AUDIO_HARDWARE,
+  PIPELINE_ERROR_OPERATION_PENDING,
+  PIPELINE_ERROR_INVALID_STATE,
   // Demuxer related errors.
   DEMUXER_ERROR_COULD_NOT_OPEN,
   DEMUXER_ERROR_COULD_NOT_PARSE,
   DEMUXER_ERROR_NO_SUPPORTED_STREAMS,
   DEMUXER_ERROR_COULD_NOT_CREATE_THREAD,
 };
 
 class FilterCollection;
 
 // Client-provided callbacks for various pipeline operations.  Clients should
@@ skipping 126 matching lines @@
 
  protected:
   // Only allow ourselves to be deleted by reference counting.
   friend class base::RefCountedThreadSafe<Pipeline>;
   virtual ~Pipeline() {}
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_PIPELINE_H_