Motown: Implement MediaTimelineController and use it.

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 "mojo/services/media/core/interfaces/timeline_controller.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 {
@@ skipping 19 matching lines @@
   static constexpr int64_t kMinimumLeadTime = Timeline::ns_from_ms(30);
 
   // Internal state.
   enum class State {
     kWaiting,  // Waiting for some work to complete.
     kPaused,
     kPlaying,
   };
 
   struct Stream {
-    Stream(size_t index, MediaTypePtr media_type);
+    Stream();
     ~Stream();
-    size_t index_;
-    bool enabled_ = false;
-    bool end_of_stream_ = false;
-    MediaTypePtr media_type_;
+    // TODO(dalesat): Have the sink enlist the decoder.
     MediaTypeConverterPtr decoder_;
     MediaSinkPtr sink_;
-    MediaTimelineControlSitePtr timeline_control_site_;
-    TimelineConsumerPtr timeline_consumer_;
+    // The following fields are just temporaries used to solve lambda capture
+    // problems.
     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();
 
-  // 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);
-
-  // 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);
-
-  // Determines if all the enabled sinks have reached end-of-stream. Returns
-  // false if there are no enabled streams.
-  bool AllSinksAtEndOfStream();
+  // Sets the timeline transform. transform_subject_time_ is used for the
+  // subject_time, and the effective_reference_time is now plus
+  // kMinimumLeadTime.
+  void SetTimelineTransform(uint32_t reference_delta, uint32_t subject_delta);
 
   // Prepares a stream.
   void PrepareStream(Stream* stream,
+                     size_t index,
+                     const MediaTypePtr& input_media_type,
                      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 control site. When called with the default
+  // Handles a status update from the 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_;
+  MediaTimelineControllerPtr timeline_controller_;
+  MediaTimelineControlSitePtr timeline_control_site_;
+  TimelineConsumerPtr timeline_consumer_;
   std::vector<std::unique_ptr<Stream>> streams_;
   State state_ = State::kWaiting;
   State target_state_ = State::kPaused;
   bool flushed_ = true;
+  bool end_of_stream_ = false;
   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_