Redesign the copresence audio handlers.

components/copresence/mediums/audio/audio_manager.h

+// Copyright 2014 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 COMPONENTS_COPRESENCE_MEDIUMS_AUDIO_AUDIO_MANAGER_H_
+#define COMPONENTS_COPRESENCE_MEDIUMS_AUDIO_AUDIO_MANAGER_H_
+
+#include <string>
+
+#include "base/callback.h"
+#include "components/copresence/public/copresence_constants.h"
+
+namespace media {
+class AudioBusRefCounted;
+}
+
+namespace copresence {
+
+class AudioManager {
+ public:
+  typedef base::Callback<void(const std::string&,
+                              AudioType,
+                              const scoped_refptr<media::AudioBusRefCounted>&)>
+      SamplesCallback;
+  typedef base::Callback<void(const std::string&,
+                              AudioType,
+                              const SamplesCallback&)> EncodeTokenCallback;
+  typedef base::Callback<void(AudioType, const std::string&)>
+      DecodeSamplesCallback;
+
+  virtual ~AudioManager() {}
+
+  // Initializes the object. Do not use this object before calling this method.
+  virtual void Initialize(const DecodeSamplesCallback& decode_cb,
+                          const EncodeTokenCallback& encode_cb) = 0;
+
+  virtual void StartPlaying(AudioType type) = 0;
+  virtual void StopPlaying(AudioType type) = 0;
+
+  virtual void StartRecording(AudioType type) = 0;
+  virtual void StopRecording(AudioType type) = 0;
+
+  virtual void SetToken(AudioType type,
+                        const std::string& url_unsafe_token) = 0;
+
+  virtual const std::string GetToken(AudioType type) = 0;
+
+  virtual bool IsRecording(AudioType type) = 0;
+  virtual bool IsPlaying(AudioType type) = 0;
+};
+
+}  // namespace copresence
+
+#endif  // COMPONENTS_COPRESENCE_MEDIUMS_AUDIO_AUDIO_MANAGER_H_