Move VideoRenderer out of Filter heirarchy.

media/base/composite_filter.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_COMPOSITE_FILTER_H_
-#define MEDIA_BASE_COMPOSITE_FILTER_H_
-
-#include <vector>
-
-#include "base/callback.h"
-#include "base/memory/weak_ptr.h"
-#include "media/base/filter_host.h"
-#include "media/base/filters.h"
-
-namespace base {
-class MessageLoopProxy;
-}
-
-namespace media {
-
-class MEDIA_EXPORT CompositeFilter : public Filter {
- public:
-  explicit CompositeFilter(
-      const scoped_refptr<base::MessageLoopProxy>& message_loop);
-
-  // Adds a filter to the composite. This is only allowed after SetHost()
-  // is called and before the first state changing operation such as Play(),
-  // Flush(), Stop(), or Seek(). CHECK-fails if preconditions are not met.
-  void AddFilter(scoped_refptr<Filter> filter);
-
-  // media::Filter methods.
-  virtual void SetHost(FilterHost* host) OVERRIDE;
-  virtual void Play(const base::Closure& play_cb) OVERRIDE;
-  virtual void Pause(const base::Closure& pause_cb) OVERRIDE;
-  virtual void Flush(const base::Closure& flush_cb) OVERRIDE;
-  virtual void Stop(const base::Closure& stop_cb) OVERRIDE;
-  virtual void SetPlaybackRate(float playback_rate) OVERRIDE;
-  virtual void Seek(
-      base::TimeDelta time, const PipelineStatusCB& seek_cb) OVERRIDE;
-
- protected:
-  virtual ~CompositeFilter();
-
-  void SetError(PipelineStatus error);
-
- private:
-  class FilterHostImpl;
-
-  enum State {
-    kInvalid,
-    kCreated,
-    kPaused,
-    kPlayPending,
-    kStopWhilePlayPending,
-    kPlaying,
-    kPausePending,
-    kStopWhilePausePending,
-    kFlushPending,
-    kStopWhileFlushPending,
-    kSeekPending,
-    kStopWhileSeekPending,
-    kStopPending,
-    kStopped,
-    kError
-  };
-
-  // Transition to a new state.
-  void ChangeState(State new_state);
-
-  // Start calling filters in a sequence.
-  void StartSerialCallSequence();
-
-  // Call filters in parallel.
-  void StartParallelCallSequence();
-
-  // Call the filter based on the current value of state_.
-  void CallFilter(scoped_refptr<Filter>& filter, const base::Closure& callback);
-
-  // Calls |callback_| and then clears the reference.
-  void DispatchPendingCallback(PipelineStatus status);
-
-  // Gets the state to transition to given |state|.
-  State GetNextState(State state) const;
-
-  // Filter callback for a serial sequence.
-  void SerialCallback();
-
-  // Filter callback for a parallel sequence.
-  void ParallelCallback();
-
-  // Called when a parallel or serial call sequence completes.
-  void OnCallSequenceDone();
-
-  // Helper function for sending an error to the FilterHost.
-  void SendErrorToHost(PipelineStatus error);
-
-  // Creates a callback that can be called from any thread, but is guaranteed
-  // to call the specified method on the thread associated with this filter.
-  base::Closure NewThreadSafeCallback(void (CompositeFilter::*method)());
-
-  // Helper function that indicates whether SetError() calls can be forwarded
-  // to the host of this filter.
-  bool CanForwardError();
-
-  // Checks to see if a Play(), Pause(), Flush(), Stop(), or Seek() operation is
-  // pending.
-  bool IsOperationPending() const;
-
-  // Called by operations that take a PipelineStatusCB instead of a Closure.
-  // TODO: Remove when Closures are replaced by PipelineStatusCB.
-  void OnStatusCB(const base::Closure& callback, PipelineStatus status);
-
-  // Convenience method for accessing the FilterHost object.
-  FilterHost* host();
-
-  // Vector of the filters added to the composite.
-  typedef std::vector<scoped_refptr<Filter> > FilterVector;
-  FilterVector filters_;
-
-  // Callback for the pending request.
-  // TODO: Remove callback_ when Closures are replaced by PipelineStatusCB.
-  base::Closure callback_;
-  PipelineStatusCB status_cb_;
-
-  // Time parameter for the pending Seek() request.
-  base::TimeDelta pending_seek_time_;
-
-  // Current state of this filter.
-  State state_;
-
-  // The index of the filter currently processing a request.
-  unsigned int sequence_index_;
-
-  // Message loop passed into the constructor.
-  scoped_refptr<base::MessageLoopProxy> message_loop_;
-
-  // FilterHost implementation passed to Filters owned by this
-  // object.
-  scoped_ptr<FilterHostImpl> host_impl_;
-
-  // PIPELINE_OK, or last error passed to SetError().
-  PipelineStatus status_;
-
-  base::WeakPtrFactory<CompositeFilter> weak_ptr_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(CompositeFilter);
-};
-
-}  // namespace media
-
-#endif  // MEDIA_BASE_COMPOSITE_FILTER_H_