Motown: Framework parts for mojo transport (producer/consumer/mediapipe) and control (audiotrack).

services/media/framework_mojo/audio_track_controller.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 SERVICES_MEDIA_FRAMEWORK_MOJO_AUDIO_TRACK_CONTROLLER_H_
+#define SERVICES_MEDIA_FRAMEWORK_MOJO_AUDIO_TRACK_CONTROLLER_H_
+
+#include "mojo/public/cpp/application/application_impl.h"
+#include "mojo/services/media/audio/interfaces/audio_track.mojom.h"
+#include "mojo/services/media/common/interfaces/media_pipe.mojom.h"
+#include "services/media/framework/graph.h"
+#include "services/media/framework/stream_type.h"
+#include "services/media/framework_mojo/audio_track_producer.h"
+
+namespace mojo {
+namespace media {
+
+// Controls an audio track.
+class AudioTrackController {
+ public:
+  using ConstructorCallback =
+      Callback<void(std::shared_ptr<AudioTrackProducer>)>;
+  using SetRateCallback = std::function<void(TimelineTransformPtr)>;
+
+  AudioTrackController(
+      const String& url,
+      std::unique_ptr<StreamType> stream_type,
+      Graph* graph,
+      OutputRef output,
+      ApplicationImpl* app,
+      const ConstructorCallback& callback);
+
+  ~AudioTrackController();
+
+  // Sets the rate.
+  void SetRate(float rate_factor, const SetRateCallback& callback);
+
+ private:
+  AudioTrackPtr audio_track_;
+  RateControlPtr rate_control_;
+  MediaPipePtr pipe_;
+  uint32_t frames_per_second_;
+};
+
+}  // namespace media
+}  // namespace mojo
+
+#endif  // SERVICES_MEDIA_FRAMEWORK_MOJO_AUDIO_TRACK_CONTROLLER_H_