Create iOS Audio Manager implementation.

media/audio/ios/audio_manager_ios.h

Index: media/audio/ios/audio_manager_ios.h
diff --git a/media/audio/ios/audio_manager_ios.h b/media/audio/ios/audio_manager_ios.h
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+// Copyright 2012 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_AUDIO_IOS_AUDIO_MANAGER_IOS_H_
+#define MEDIA_AUDIO_IOS_AUDIO_MANAGER_IOS_H_
+
+#include "base/basictypes.h"
+#include "media/audio/audio_manager_base.h"
+
+namespace media {
+
+class PCMQueueInAudioInputStream;
+class PCMQueueOutAudioOutputStream;
+
+// iOS implementation of the AudioManager singleton. Supports only audio input.
+class MEDIA_EXPORT AudioManagerIOS : public AudioManagerBase {
+ public:
+  AudioManagerIOS();
+
+  // Implementation of AudioManager.
+  virtual bool HasAudioOutputDevices() OVERRIDE;
+  virtual bool HasAudioInputDevices() OVERRIDE;
+  virtual AudioOutputStream* MakeAudioOutputStream(
+      const AudioParameters& params) OVERRIDE;
+  virtual AudioInputStream* MakeAudioInputStream(
+      const AudioParameters& params, const std::string& device_id) OVERRIDE;
+
+  // Implementation of AudioManagerBase.
+  virtual AudioOutputStream* MakeLinearOutputStream(
+      const AudioParameters& params) OVERRIDE;
+  virtual AudioOutputStream* MakeLowLatencyOutputStream(
+      const AudioParameters& params) OVERRIDE;
+  virtual AudioInputStream* MakeLinearInputStream(
+      const AudioParameters& params, const std::string& device_id) OVERRIDE;
+  virtual AudioInputStream* MakeLowLatencyInputStream(
+      const AudioParameters& params, const std::string& device_id) OVERRIDE;
+  virtual void ReleaseOutputStream(AudioOutputStream* stream) OVERRIDE;
+  virtual void ReleaseInputStream(AudioInputStream* stream) OVERRIDE;
+
+ protected:
+  virtual ~AudioManagerIOS();
+
+ private:
+  // Initializes the audio session if necessary. Safe to call multiple times.
+  // Returns a bool indicating whether the audio session has been successfully
+  // initialized (either in the current call or in a previous call).
+  bool InitAudioSession();
+
+  DISALLOW_COPY_AND_ASSIGN(AudioManagerIOS);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_AUDIO_IOS_AUDIO_MANAGER_IOS_H_