Implement MojoAudioRendererSink and use it in UtilityMojoMediaClient

media/mojo/services/mojo_audio_renderer_sink_adapter.h

+// Copyright 2017 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 MEDIA_MOJO_SERVICES_MOJO_AUDIO_RENDERER_SINK_ADAPTER_H_
+#define MEDIA_MOJO_SERVICES_MOJO_AUDIO_RENDERER_SINK_ADAPTER_H_
+
+#include "media/base/audio_renderer_sink.h"
+#include "media/mojo/interfaces/audio_renderer_sink.mojom.h"
+#include "media/mojo/services/media_mojo_export.h"
+#include "mojo/public/cpp/bindings/binding.h"
+
+namespace media {
+
+class SingleThreadTaskRunner;
+
+class MEDIA_MOJO_EXPORT MojoAudioRendererSinkAdapter
+    : public media::AudioRendererSink,
+      public mojom::AudioRendererSinkRenderCallback {
+ public:
+  MojoAudioRendererSinkAdapter(const std::string& audio_device_id);
+
+  void SetClient(mojom::AudioRendererSinkPtr sink);
+
+  // AudioRendererSink implementation.
+  void Initialize(const media::AudioParameters& params,
+                  media::AudioRendererSink::RenderCallback* callback) override;
+  void Start() override;
+  void Stop() override;
+  void Pause() override;
+  void Play() override;
+  bool SetVolume(double volume) override;
+  media::OutputDeviceInfo GetOutputDeviceInfo() override;
+  bool CurrentThreadIsRenderingThread() override;
+
+  // mojom::AudioRendererSinkRenderCallback implementation.
+  void Render(
+      base::TimeDelta delay,
+      base::TimeTicks delay_timestamp,
+      int prior_frames_skipped,
+      const media::mojom::AudioRendererSinkRenderCallback::RenderCallback&
+          callback) final;
+  void OnRenderError() final;
+
+ protected:
+  ~MojoAudioRendererSinkAdapter() override;
+
+ private:
+  mojo::Binding<mojom::AudioRendererSinkRenderCallback> binding_;
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  std::string audio_device_id_;
+  bool started_;
+  media::AudioRendererSink::RenderCallback* render_callback_;
+  mojom::AudioRendererSinkPtr sink_;
+  std::unique_ptr<AudioBus> audio_bus_;
+};
+
+}  // namespace media
+
+#endif  // MEDIA_MOJO_SERVICES_MOJO_AUDIO_RENDERER_SINK_ADAPTER_H_