Chromecast: adds media::Renderer implementation for CMA pipeline.

chromecast/media/cma/filters/cma_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 CHROMECAST_MEDIA_CMA_FILTERS_CMA_RENDERER_H_
+#define CHROMECAST_MEDIA_CMA_FILTERS_CMA_RENDERER_H_
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/synchronization/lock.h"
+#include "base/threading/thread_checker.h"
+#include "base/time/default_tick_clock.h"
+#include "media/base/buffering_state.h"
+#include "media/base/renderer.h"
+#include "ui/gfx/geometry/size.h"
+
+namespace base {
+class MessageLoopProxy;
+}
+
+namespace media {
+class DemuxerStreamProvider;
+class TimeDeltaInterpolator;
+class VideoFrame;
+}
+
+namespace chromecast {
+namespace media {
+class AudioPipeline;
+class BalancedMediaTaskRunnerFactory;
+class MediaPipeline;
+class VideoPipeline;
+
+class CmaRenderer : public ::media::Renderer {
+ public:
+  explicit CmaRenderer(scoped_ptr<MediaPipeline> media_pipeline);
+  ~CmaRenderer() override;
+
+  // ::media::Renderer implementation:
+  void Initialize(
+      ::media::DemuxerStreamProvider* demuxer_stream_provider,
+      const base::Closure& init_cb,
+      const ::media::StatisticsCB& statistics_cb,
+      const ::media::BufferingStateCB& buffering_state_cb,
+      const PaintCB& paint_cb,
+      const base::Closure& ended_cb,
+      const ::media::PipelineStatusCB& error_cb) override;
+  void Flush(const base::Closure& flush_cb) override;
+  void StartPlayingFrom(base::TimeDelta time) override;
+  void SetPlaybackRate(float playback_rate) override;
+  void SetVolume(float volume) override;
+  base::TimeDelta GetMediaTime() override;
+  bool HasAudio() override;
+  bool HasVideo() override;
+  void SetCdm(::media::CdmContext* cdm_context,
+              const ::media::CdmAttachedCB& cdm_attached_cb) override;
+
+ private:
+  enum State {
+    kUninitialized,
+    kPlaying,
+    kFlushed,
+    kError,
+  };
+
+  // Asynchronous initialization sequence. These four methods are invoked in
+  // the order below, with a successful initialization making it to
+  // OnVideoPipelineInitializeDone, regardless of which streams are present.
+  void InitializeAudioPipeline();
+  void OnAudioPipelineInitializeDone(::media::PipelineStatus status);
+  void InitializeVideoPipeline();
+  void OnVideoPipelineInitializeDone(::media::PipelineStatus status);
+
+  // Callbacks for AvPipelineClient.
+  void OnEosReached(bool is_audio);
+  void OnStatisticsUpdated(const ::media::PipelineStatistics& stats);
+  void OnNaturalSizeChanged(const gfx::Size& size);
+
+  // Callbacks for MediaPipelineClient.
+  void OnPlaybackTimeUpdated(base::TimeDelta time,
+                             base::TimeDelta max_time,
+                             base::TimeTicks capture_time);
+  void OnBufferingNotification(::media::BufferingState state);
+
+  void OnFlushDone(::media::PipelineStatus status);
+  void OnError(::media::PipelineStatus status);
+
+  void FireAllPendingCallbacks();
+
+  // Begin a state transition.
+  // Return true if delayed because of a pending state transition.
+  void BeginStateTransition();
+  void CompleteStateTransition(State new_state);
+
+  base::ThreadChecker thread_checker_;
+
+  scoped_refptr<BalancedMediaTaskRunnerFactory> media_task_runner_factory_;
+  scoped_ptr<MediaPipeline> media_pipeline_;
+  AudioPipeline* audio_pipeline_;
+  VideoPipeline* video_pipeline_;
+
+  ::media::DemuxerStreamProvider* demuxer_stream_provider_;
+
+  // Set of callbacks.
+  PaintCB paint_cb_;
+  base::Closure init_cb_;
+  ::media::StatisticsCB statistics_cb_;
+  base::Closure ended_cb_;
+  ::media::PipelineStatusCB error_cb_;
+  ::media::BufferingStateCB buffering_state_cb_;
+  base::Closure flush_cb_;
+
+  // Renderer state.
+  // Used mostly for checking that transitions are correct.
+  State state_;
+  bool is_pending_transition_;
+
+  bool has_audio_;
+  bool has_video_;
+
+  bool received_audio_eos_;
+  bool received_video_eos_;
+
+  // Data members for helping the creation of the initial video hole frame.
+  gfx::Size initial_natural_size_;
+  bool initial_video_hole_created_;
+
+  // Lock protecting access to |time_interpolator_|.
+  base::Lock time_interpolator_lock_;
+
+  // base::TickClock used by |time_interpolator_|.
+  base::DefaultTickClock default_tick_clock_;
+
+  // Tracks the most recent media time update and provides interpolated values
+  // as playback progresses.
+  scoped_ptr< ::media::TimeDeltaInterpolator> time_interpolator_;
+
+  float playback_rate_;
+
+  base::WeakPtr<CmaRenderer> weak_this_;
+  base::WeakPtrFactory<CmaRenderer> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(CmaRenderer);
+};
+
+}  // namespace media
+}  // namespace chromecast
+
+#endif  // CHROMECAST_MEDIA_CMA_FILTERS_CMA_RENDERER_H_