Motown: Use new TimelineTransform and related definitions

services/media/common/timeline_control_site.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_COMMON_TIMELINE_CONTROL_SITE_IMPL_H_
+#define MOJO_SERVICES_MEDIA_COMMON_TIMELINE_CONTROL_SITE_IMPL_H_
+
+#include "base/single_thread_task_runner.h"
+#include "base/synchronization/lock.h"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "mojo/services/media/common/cpp/timeline_function.h"
+#include "mojo/services/media/core/interfaces/timeline_controller.mojom.h"
+#include "services/media/common/mojo_publisher.h"
+
+namespace mojo {
+namespace media {
+
+// MediaTimelineControlSite implementation.
+class TimelineControlSite : public MediaTimelineControlSite,
+                            public TimelineConsumer {
+ public:
+  TimelineControlSite();
+
+  ~TimelineControlSite() override;
+
+  // Binds to the control site. If a binding exists already, it is closed.
+  void Bind(InterfaceRequest<MediaTimelineControlSite> request);
+
+  // Determines whether the control site is currently bound.
+  bool is_bound() { return control_site_binding_.is_bound(); }
+
+  // Unbinds from clients and resets to initial state.
+  void Reset();
+
+  // Get the TimelineFunction for the reference_time (which should be 'now',
+  // approximately).
+  void SnapshotCurrentFunction(int64_t reference_time,
+                               TimelineFunction* out,
+                               uint32_t* generation = nullptr);
+
+  // MediaTimelineControlSite implementation.
+  void GetStatus(uint64_t version_last_seen,
+                 const GetStatusCallback& callback) override;
+
+  void GetTimelineConsumer(
+      InterfaceRequest<TimelineConsumer> timeline_consumer) override;
+
+  // TimelineConsumer implementation.
+  void SetTimelineTransform(
+      int64_t subject_time,
+      uint32_t reference_delta,
+      uint32_t subject_delta,
+      int64_t effective_reference_time,
+      int64_t effective_subject_time,
+      const SetTimelineTransformCallback& callback) override;
+
+ private:
+  // Applies pending_timeline_function_ if it's time to do so based on the
+  // given reference time.
+  void ApplyPendingChangesUnsafe(int64_t reference_time);
+
+  // Clears the pending timeline function and calls its associated callback
+  // with the indicated completed status.
+  void ClearPendingTimelineFunctionUnsafe(bool completed);
+
+  // Determines if an unrealized timeline function is currently pending.
+  bool TimelineFunctionPendingUnsafe() {
+    return pending_timeline_function_.reference_time() != kUnspecifiedTime;
+  }
+
+  // Unbinds from clients and resets to initial state.
+  void ResetUnsafe();
+
+  static void RunCallback(SetTimelineTransformCallback callback,
+                          bool completed);
+
+  Binding<MediaTimelineControlSite> control_site_binding_;
+  Binding<TimelineConsumer> consumer_binding_;
+  MojoPublisher<GetStatusCallback> status_publisher_;
+
+  base::Lock lock_;
+  // BEGIN fields synchronized using lock_.
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  TimelineFunction current_timeline_function_;
+  TimelineFunction pending_timeline_function_;
+  SetTimelineTransformCallback set_timeline_transform_callback_;
+  uint32_t generation_ = 1;
+  // END fields synchronized using lock_.
+};
+
+}  // namespace media
+}  // namespace mojo
+
+#endif  // MOJO_SERVICES_MEDIA_COMMON_TIMELINE_CONTROL_SITE_IMPL_H_