Mojo interfaces needed for switching audio rendering stream creation and closing from IPC to Mojo

content/renderer/media/audio_output_client.h

+// Copyright 2015 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_RENDERER_MEDIA_AUDIO_OUTPUT_CLIENT_H_
+#define CONTENT_RENDERER_MEDIA_AUDIO_OUTPUT_CLIENT_H_
+
+#include <map>
+
+#include "base/files/file.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/shared_memory_handle.h"
+#include "base/sync_socket.h"
+#include "base/threading/thread_checker.h"
+#include "content/common/content_export.h"
+#include "media/mojo/interfaces/audio_output.mojom.h"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "mojo/public/cpp/bindings/interface_request.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}
+
+namespace media {
+class AudioParameters;
+}
+
+namespace content {
+
+class AudioMessageFilter;
+class ServiceRegistry;
+
+
+class CONTENT_EXPORT AudioOutputClient {
+ public:
+  explicit AudioOutputClient(ServiceRegistry* service_registry,
+                             AudioMessageFilter* audio_message_filter);
+
+
+  ~AudioOutputClient();
+
+  void CreateStream(int stream_id,

[Henrik Grunell, 2016/04/19 15:36:09]

Add comments to all functions.

[rchtara, 2016/04/21 09:10:18]

Done.

+                    int render_frame_id,
+                    const media::AudioParameters& params);
+  void CreateStreamOnMainThread(int stream_id,
+                                int render_frame_id,
+                                const media::AudioParameters& params);
+  void CreateStreamCallback(mojom::AudioOutputStreamPtr stream,
+                            int stream_id,
+                            mojo::ScopedSharedBufferHandle shared_buffer,
+                            mojo::ScopedHandle socket_descriptor);
+  void CreateStreamOnIOThread(
+      mojom::AudioOutputStreamPtr* const stream,
+      base::SharedMemoryHandle handle,
+      base::SyncSocket::TransitDescriptor socket_descriptor,
+      uint32_t length);
+
+  void CloseStream(int stream_id);
+  void CloseStreamOnMainThread(int stream_id);
+
+  void OnStreamError(int stream_id);
+  void ReportErrorOnIOThread(int stream_id);
+
+ private:
+  // Mojo connection error handler.
+  void OnConnectionError();
+
+  // The Mojo service for registering observers to listen for enable/disable
+  // events.
+  mojom::AudioOutputPtr service_;
+  std::map<int, scoped_ptr<mojom::AudioOutputStreamPtr>> streams_;
+
+  scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
+  AudioMessageFilter* audio_message_filter_;

[Henrik Grunell, 2016/04/19 15:36:09]

How is it guaranteed that the filter outlives this object?

[rchtara, 2016/04/21 09:10:18]

I will replace it by scoped_refptr<AudioMessageFilter>

+  DISALLOW_COPY_AND_ASSIGN(AudioOutputClient);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_MEDIA_AUDIO_OUTPUT_CLIENT_H_