Motown: Convert MediaSink to expose MediaTimelineControlSite

services/media/factory_service/media_player_impl.h

 // Copyright 2016 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 MOJO_SERVICES_MEDIA_FACTORY_MEDIA_PLAYER_IMPL_H_
 #define MOJO_SERVICES_MEDIA_FACTORY_MEDIA_PLAYER_IMPL_H_
 
 #include <limits>
 #include <vector>
 
 #include "mojo/public/cpp/application/application_impl.h"
 #include "mojo/public/cpp/bindings/binding.h"
+#include "mojo/services/media/common/cpp/timeline.h"
+#include "mojo/services/media/common/cpp/timeline_function.h"
 #include "mojo/services/media/common/interfaces/media_transport.mojom.h"
 #include "mojo/services/media/control/interfaces/media_factory.mojom.h"
 #include "mojo/services/media/core/interfaces/seeking_reader.mojom.h"
 #include "services/media/common/mojo_publisher.h"
 #include "services/media/factory_service/factory_service.h"
+#include "services/media/framework/util/callback_joiner.h"
 
 namespace mojo {
 namespace media {
 
 // Mojo agent that renders streams from an origin specified by URL.
 class MediaPlayerImpl : public MediaFactoryService::Product<MediaPlayer>,
                         public MediaPlayer {
  public:
   static std::shared_ptr<MediaPlayerImpl> Create(
       InterfaceHandle<SeekingReader> reader,
       InterfaceRequest<MediaPlayer> request,
       MediaFactoryService* owner);
 
   ~MediaPlayerImpl() override;
 
   // MediaPlayer implementation.
   void GetStatus(uint64_t version_last_seen,
                  const GetStatusCallback& callback) override;
 
   void Play() override;
 
   void Pause() override;
 
   void Seek(int64_t position) override;
 
  private:
-  const int64_t kNotSeeking = std::numeric_limits<int64_t>::max();
+  static constexpr int64_t kMinimumLeadTime = Timeline::ns_from_ms(30);
 
   // Internal state.
   enum class State {
     kWaiting,  // Waiting for some work to complete.
     kPaused,
-    kWaitingForSinksToPlay,
     kPlaying,
-    kWaitingForSinksToPause
-  };
-
-  // For matching sink states.
-  enum class SinkState {
-    kPaused,
-    kPlaying,
-    kEnded,
-    kPausedOrEnded,
-    kPlayingOrEnded
   };
 
   struct Stream {
     Stream(size_t index, MediaTypePtr media_type);
     ~Stream();
     size_t index_;
     bool enabled_ = false;
-    MediaState state_ = MediaState::UNPREPARED;
+    bool end_of_stream_ = false;
     MediaTypePtr media_type_;
     MediaTypeConverterPtr decoder_;
     MediaSinkPtr sink_;
+    MediaTimelineControlSitePtr timeline_control_site_;
+    TimelineConsumerPtr timeline_consumer_;
     MediaProducerPtr encoded_producer_;
     MediaProducerPtr decoded_producer_;
   };
 
   MediaPlayerImpl(InterfaceHandle<SeekingReader> reader,
                   InterfaceRequest<MediaPlayer> request,
                   MediaFactoryService* owner);
 
   // Takes action based on current state.
   void Update();
 
   // Handles seeking in paused state.
   void WhenPausedAndSeeking();
 
   // Handles seeking in paused state with flushed pipeline.
   void WhenFlushedAndSeeking();
 
-  // Tells the sinks to change state.
-  void ChangeSinkStates(MediaState media_state);
+  // Sets the timeline transforms on all the sinks. transform_subject_time_ is
+  // used for the subject_time, and the effective_reference_time is now plus an
+  // epsilon.
+  void SetSinkTimelineTransforms(uint32_t reference_delta,
+                                 uint32_t subject_delta);
 
-  // Determines if all the enabled sinks have the specified state.
-  bool AllSinksAre(SinkState sink_state);
+  // Sets the timeline transforms on all the sinks.
+  void SetSinkTimelineTransforms(int64_t subject_time,
+                                 uint32_t reference_delta,
+                                 uint32_t subject_delta,
+                                 int64_t effective_reference_time,
+                                 int64_t effective_subject_time);
 
-  // Sets the reported_media_state_ field, calling StatusUpdated as needed.
-  void SetReportedMediaState(MediaState media_state);
+  // Determines if all the enabled sinks have reached end-of-stream. Returns
+  // false if there are no enabled streams.
+  bool AllSinksAtEndOfStream();
 
   // Prepares a stream.
   void PrepareStream(Stream* stream,
                      const String& url,
                      const std::function<void()>& callback);
 
   // Creates a sink for a stream.
   void CreateSink(Stream* stream,
                   const MediaTypePtr& input_media_type,
                   const String& url,
                   const std::function<void()>& callback);
 
   // Handles a metadata update from the demux. When called with the default
   // argument values, initiates demux metadata updates.
   void HandleDemuxMetadataUpdates(
       uint64_t version = MediaDemux::kInitialMetadata,
       MediaMetadataPtr metadata = nullptr);
 
-  // Handles a status update from a sink. When called with the default
-  // argument values, initiates sink status updates.
-  void HandleSinkStatusUpdates(Stream* stream,
-                               uint64_t version = MediaSink::kInitialStatus,
-                               MediaSinkStatusPtr status = nullptr);
+  // Handles a status update from a control site. When called with the default
+  // argument values, initiates control site. status updates.
+  void HandleTimelineControlSiteStatusUpdates(
+      Stream* stream,
+      uint64_t version = MediaTimelineControlSite::kInitialStatus,
+      MediaTimelineControlSiteStatusPtr status = nullptr);
 
   MediaFactoryPtr factory_;
   MediaDemuxPtr demux_;
   std::vector<std::unique_ptr<Stream>> streams_;
   State state_ = State::kWaiting;
+  State target_state_ = State::kPaused;
   bool flushed_ = true;
-  MediaState reported_media_state_ = MediaState::UNPREPARED;
-  MediaState target_state_ = MediaState::PAUSED;
-  int64_t target_position_ = kNotSeeking;
-  TimelineTransformPtr transform_;
+  int64_t target_position_ = kUnspecifiedTime;
+  int64_t transform_subject_time_ = kUnspecifiedTime;
+  TimelineFunction timeline_function_;
+  CallbackJoiner set_transform_joiner_;
   MediaMetadataPtr metadata_;
   MojoPublisher<GetStatusCallback> status_publisher_;
 };
 
 }  // namespace media
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_MEDIA_FACTORY_MEDIA_PLAYER_IMPL_H_