Moved renderer implementation from media/filters/ to media/renderers/

media/filters/renderer_impl.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_FILTERS_RENDERER_IMPL_H_
-#define MEDIA_FILTERS_RENDERER_IMPL_H_
-
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/weak_ptr.h"
-#include "base/synchronization/lock.h"
-#include "base/time/clock.h"
-#include "base/time/default_tick_clock.h"
-#include "base/time/time.h"
-#include "media/base/buffering_state.h"
-#include "media/base/decryptor.h"
-#include "media/base/media_export.h"
-#include "media/base/pipeline_status.h"
-#include "media/base/renderer.h"
-
-namespace base {
-class SingleThreadTaskRunner;
-}
-
-namespace media {
-
-class AudioRenderer;
-class DemuxerStreamProvider;
-class TimeSource;
-class VideoRenderer;
-class WallClockTimeSource;
-
-class MEDIA_EXPORT RendererImpl : public Renderer {
- public:
-  // Renders audio/video streams using |audio_renderer| and |video_renderer|
-  // provided. All methods except for GetMediaTime() run on the |task_runner|.
-  // GetMediaTime() runs on the render main thread because it's part of JS sync
-  // API.
-  RendererImpl(const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
-               scoped_ptr<AudioRenderer> audio_renderer,
-               scoped_ptr<VideoRenderer> video_renderer);
-
-  ~RendererImpl() final;
-
-  // Renderer implementation.
-  void Initialize(DemuxerStreamProvider* demuxer_stream_provider,
-                  const PipelineStatusCB& init_cb,
-                  const StatisticsCB& statistics_cb,
-                  const BufferingStateCB& buffering_state_cb,
-                  const PaintCB& paint_cb,
-                  const base::Closure& ended_cb,
-                  const PipelineStatusCB& error_cb) final;
-  void SetCdm(CdmContext* cdm_context,
-              const CdmAttachedCB& cdm_attached_cb) final;
-  void Flush(const base::Closure& flush_cb) final;
-  void StartPlayingFrom(base::TimeDelta time) final;
-  void SetPlaybackRate(float playback_rate) final;
-  void SetVolume(float volume) final;
-  base::TimeDelta GetMediaTime() final;
-  bool HasAudio() final;
-  bool HasVideo() final;
-
-  // Helper functions for testing purposes. Must be called before Initialize().
-  void DisableUnderflowForTesting();
-  void EnableClocklessVideoPlaybackForTesting();
-
- private:
-  enum State {
-    STATE_UNINITIALIZED,
-    STATE_INITIALIZING,
-    STATE_FLUSHING,
-    STATE_PLAYING,
-    STATE_ERROR
-  };
-
-  base::TimeDelta GetMediaTimeForSyncingVideo();
-
-  // Requests that this object notifies when a decryptor is ready through the
-  // |decryptor_ready_cb| provided.
-  // If |decryptor_ready_cb| is null, the existing callback will be fired with
-  // nullptr immediately and reset.
-  void SetDecryptorReadyCallback(const DecryptorReadyCB& decryptor_ready_cb);
-
-  // Helper functions and callbacks for Initialize().
-  void InitializeAudioRenderer();
-  void OnAudioRendererInitializeDone(PipelineStatus status);
-  void InitializeVideoRenderer();
-  void OnVideoRendererInitializeDone(PipelineStatus status);
-
-  // Helper functions and callbacks for Flush().
-  void FlushAudioRenderer();
-  void OnAudioRendererFlushDone();
-  void FlushVideoRenderer();
-  void OnVideoRendererFlushDone();
-
-  // Callback executed by filters to update statistics.
-  void OnUpdateStatistics(const PipelineStatistics& stats);
-
-  // Collection of callback methods and helpers for tracking changes in
-  // buffering state and transition from paused/underflow states and playing
-  // states.
-  //
-  // While in the kPlaying state:
-  //   - A waiting to non-waiting transition indicates preroll has completed
-  //     and StartPlayback() should be called
-  //   - A non-waiting to waiting transition indicates underflow has occurred
-  //     and PausePlayback() should be called
-  void OnBufferingStateChanged(BufferingState* buffering_state,
-                               BufferingState new_buffering_state);
-  bool WaitingForEnoughData() const;
-  void PausePlayback();
-  void StartPlayback();
-
-  // Callbacks executed when a renderer has ended.
-  void OnAudioRendererEnded();
-  void OnVideoRendererEnded();
-  bool PlaybackHasEnded() const;
-  void RunEndedCallbackIfNeeded();
-
-  // Callback executed when a runtime error happens.
-  void OnError(PipelineStatus error);
-
-  State state_;
-
-  // Task runner used to execute pipeline tasks.
-  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
-
-  DemuxerStreamProvider* demuxer_stream_provider_;
-
-  // Permanent callbacks to notify various renderer states/stats.
-  StatisticsCB statistics_cb_;
-  base::Closure ended_cb_;
-  PipelineStatusCB error_cb_;
-  BufferingStateCB buffering_state_cb_;
-  PaintCB paint_cb_;
-
-  // Temporary callback used for Initialize() and Flush().
-  PipelineStatusCB init_cb_;
-  base::Closure flush_cb_;
-
-  scoped_ptr<AudioRenderer> audio_renderer_;
-  scoped_ptr<VideoRenderer> video_renderer_;
-
-  // Renderer-provided time source used to control playback.
-  TimeSource* time_source_;
-  scoped_ptr<WallClockTimeSource> wall_clock_time_source_;
-  bool time_ticking_;
-
-  // The time to start playback from after starting/seeking has completed.
-  base::TimeDelta start_time_;
-
-  BufferingState audio_buffering_state_;
-  BufferingState video_buffering_state_;
-
-  // Whether we've received the audio/video ended events.
-  bool audio_ended_;
-  bool video_ended_;
-
-  CdmContext* cdm_context_;
-
-  // Callback registered by filters (decoder or demuxer) to be informed of a
-  // Decryptor.
-  // Note: We could have multiple filters registering this callback. One
-  // callback is okay because:
-  // 1, We always initialize filters in sequence.
-  // 2, Filter initialization will not finish until this callback is satisfied.
-  DecryptorReadyCB decryptor_ready_cb_;
-
-  bool underflow_disabled_for_testing_;
-  bool clockless_video_playback_enabled_for_testing_;
-
-  base::WeakPtr<RendererImpl> weak_this_;
-  base::WeakPtrFactory<RendererImpl> weak_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(RendererImpl);
-};
-
-}  // namespace media
-
-#endif  // MEDIA_FILTERS_RENDERER_IMPL_H_