Revert of media: Introduce Renderer interface and RendererImpl.

media/base/renderer.h

-// Copyright 2014 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_RENDERER_H_
-#define MEDIA_BASE_RENDERER_H_
-
-#include "base/callback.h"
-#include "base/time/time.h"
-#include "media/base/buffering_state.h"
-#include "media/base/media_export.h"
-#include "media/base/pipeline_status.h"
-
-namespace media {
-
-class MediaKeys;
-
-class MEDIA_EXPORT Renderer {
- public:
-  typedef base::Callback<base::TimeDelta()> TimeDeltaCB;
-
-  Renderer();
-
-  // Stops rendering and fires any pending callbacks.
-  virtual ~Renderer();
-
-  // Initializes the Renderer, executing |init_cb| upon completion.
-  // TODO(xhwang): Provide a set of DemuxerStreams in Initialize().
-  // TODO(xhwang): Replace |init_cb| with a Closure.
-  //
-  // Permanent callbacks:
-  // - |statistics_cb|: Executed periodically with rendering statistics.
-  // - |time_cb|: Executed whenever time has advanced through rendering.
-  // - |ended_cb|: Executed when rendering has reached the end of stream.
-  // - |error_cb|: Executed if any error was encountered during rendering.
-  virtual void Initialize(const PipelineStatusCB& init_cb,
-                          const StatisticsCB& statistics_cb,
-                          const base::Closure& ended_cb,
-                          const PipelineStatusCB& error_cb,
-                          const BufferingStateCB& buffering_state_cb,
-                          const TimeDeltaCB& get_duration_cb) = 0;
-
-  // The following functions must be called after Initialize().
-
-  // Discards any buffered data, executing |flush_cb| when completed.
-  virtual void Flush(const base::Closure& flush_cb) = 0;
-
-  // Starts rendering from |time|.
-  virtual void StartPlayingFrom(base::TimeDelta time) = 0;
-
-  // Updates the current playback rate. The default playback rate should be 1.
-  virtual void SetPlaybackRate(float playback_rate) = 0;
-
-  // Sets the output volume. The default volume should be 1.
-  virtual void SetVolume(float volume) = 0;
-
-  // Returns the current media time.
-  virtual base::TimeDelta GetMediaTime() = 0;
-
-  // Returns whether |this| renders audio.
-  virtual bool HasAudio() = 0;
-
-  // Returns whether |this| renders video.
-  virtual bool HasVideo() = 0;
-
-  // Associates the |cdm| with this Renderer.
-  virtual void SetCdm(MediaKeys* cdm) = 0;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(Renderer);
-};
-
-}  // namespace media
-
-#endif  // MEDIA_BASE_RENDERER_H_