Add mojo interface for audio rendering.

content/browser/renderer_host/media/audio_output_service_impl.h

Index: content/browser/renderer_host/media/audio_output_service_impl.h
diff --git a/content/browser/renderer_host/media/audio_output_service_impl.h b/content/browser/renderer_host/media/audio_output_service_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..e5fca67847edad82e6ae07c06ced7f010077e630
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+++ b/content/browser/renderer_host/media/audio_output_service_impl.h
@@ -0,0 +1,102 @@
+// 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 CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_OUTPUT_SERVICE_IMPL_H_
+#define CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_OUTPUT_SERVICE_IMPL_H_
+
+#include <map>
+#include <memory>
+#include <string>
+#include <utility>
+
+#include "base/memory/ref_counted.h"
+#include "media/audio_output.mojom.h"
+#include "mojo/public/cpp/bindings/string.h"
+
+namespace content {
+
+class CONTENT_EXPORT AudioOutputServiceImpl : public mojom::AudioOutputService,
+                                              public RefCountedThreadSafe,
+                                              public AudioOutputServiceBase {
+ public:
+  AudioOutputServiceImpl(int render_process_id,
+                         media::AudioManager* audio_manager,
+                         AudioMirroringManager* mirroring_manager,
+                         MediaInternals* media_internals,
+                         MediaStreamManager* media_stream_manager,
+                         const std::string& salt);
+
+  // AudioOutputServiceBase implementation.
+  // Calls |callback| with the list of AudioOutputControllers for this object.
+  void GetOutputControllers(
+      const RenderProcessHost::GetAudioOutputControllersCallback& callback)
+      override const;
+  // Returns true if any streams managed by this host are actively playing.  Can
+  // be called from any thread.
+  bool HasActiveAudio();
+
+  // AudioOutputService implementation.
+  void RequestDeviceAuthorization(
+      int64_t render_frame_id,
+      int64_t session_id,
+      const mojo::String& device_id,
+      AudioOutputRequest audio_output,
+      const url::Origin& origin,
+      const RequestDeviceAuthorizationCallback& callback) override;
+
+  void AudioRendererHost::NotifyStreamCreated(BindingId binding);
+  void AudioRendererHost::NotifyStreamStateChanged(BindingId binding,
+                                                   bool is_playing);
+
+ private:
+  void AudioRendererHost::DoNotifyStreamCreated(BindingId binding);
+  void AudioRendererHost::DoNotifyStreamStateChanged(BindingId binding,
+                                                     bool is_playing);
+
+  void RegisterStartedStream(BindingId binding_id);
+
+  // Threadsafe.
+  std::unique_ptr<media::AudioLog> audio_log_;
+
+  scoped_refptr<base::SingleThreadedTaskRunner> task_runner_;
+
+  // ID of the RenderProcessHost that owns this instance.
+  const int render_process_id_;
+
+  media::AudioManager* const audio_manager_;
+  AudioMirroringManager* const mirroring_manager_;
+
+  // Used to access to AudioInputDeviceManager.
+  MediaStreamManager* const media_stream_manager_;
+
+  // The number of streams in the playing state. Atomic read safe from any
+  // thread, but should only be updated from the creation thread.
+  base::AtomicRefCount num_playing_streams_;
+
+  // Salt required to translate renderer device IDs to raw device unique IDs
+  const std::string salt_;
+
+  // Map of device authorizations for streams that are not yet created
+  // The key is the stream ID, and the value is a pair. The pair's first element
+  // is a bool that is true if the authorization process completes successfully.
+  // The second element contains the unique ID of the authorized device.
+  std::map<int, std::pair<bool, std::string>> authorizations_;
+
+#if DCHECK_IS_ON()
+  // When DCHECKs are turned on, AudioRendererHost will call this function on
+  // the UI thread to validate render frame IDs. A default is set by the
+  // constructor, but this can be overridden by unit tests.
+  ValidateRenderFrameIdFunction validate_render_frame_id_function_;
+#endif  // DCHECK_IS_ON()
+
+  // The maximum number of simultaneous streams during the lifetime of this
+  // host. Reported as UMA stat at shutdown.
+  size_t max_simultaneous_streams_;
+
+  DISALLOW_COPY_AND_ASSIGN(AudioOutputServiceImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_OUTPUT_SERVICE_IMPL_H_