Adding callback support to media filter Initialize() and Seek().

media/filters/audio_renderer_base.h

 // Copyright (c) 2009 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.
 
 // AudioRendererBase takes care of the tricky queuing work and provides simple
 // methods for subclasses to peek and poke at audio data.  In addition to
 // AudioRenderer interface methods this classes doesn't implement, subclasses
 // must also implement the following methods:
 //   OnInitialized
 //   OnStop
@@ skipping 14 matching lines @@
 #include "media/base/factory.h"
 #include "media/base/filters.h"
 
 namespace media {
 
 class AudioRendererBase : public AudioRenderer {
  public:
   // MediaFilter implementation.
   virtual void Stop();
 
-  virtual void Seek(base::TimeDelta time);
+  virtual void Seek(base::TimeDelta time, FilterCallback* callback);
 
   // AudioRenderer implementation.
-  virtual bool Initialize(AudioDecoder* decoder);
+  virtual void Initialize(AudioDecoder* decoder, FilterCallback* callback);
 
  protected:
   // The default maximum size of the queue.
   static const size_t kDefaultMaxQueueSize;
 
   // Only allow a factory to create this class.
   explicit AudioRendererBase(size_t max_queue_size);
   virtual ~AudioRendererBase();
 
   // Called by Initialize().  |media_format| is the format of the AudioDecoder.
@@ skipping 60 matching lines @@
   // Whether or not we're initialized.
   bool initialized_;
 
   // Whether or not we've stopped.
   bool stopped_;
 
   // Audio time at end of last call to FillBuffer().
   // TODO(ralphl): Update this value after seeking.
   base::TimeDelta last_fill_buffer_time_;
 
+  // Filter callbacks.
+  scoped_ptr<FilterCallback> initialize_callback_;
+
   DISALLOW_COPY_AND_ASSIGN(AudioRendererBase);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_AUDIO_RENDERER_BASE_H_