Exposes a shlib interface for media/audio path.

chromecast/media/audio/cast_audio_manager.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 CHROMECAST_MEDIA_AUDIO_CAST_AUDIO_MANAGER_H_
+#define CHROMECAST_MEDIA_AUDIO_CAST_AUDIO_MANAGER_H_
+
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+#include "base/memory/linked_ptr.h"
+#include "media/audio/audio_manager_base.h"
+
+namespace media {
+class AudioLogFactory;
+}
+
+namespace chromecast {
+namespace media {
+
+class CastAudioOutputDevice;
+class ChromecastDeviceAudioOutputStream;
+
+// This class acts as a proxy for chromecast::CastAudioOutputDevice,
+// converting external-facing chromecast interfaces and data structures to
+// those expected by ::media::AudioManager.
+class CastAudioManager : public ::media::AudioManagerBase {
+ public:
+  // This class does not take ownership of |audio_output_device|, which must be
+  // non-null and which must outlive this class. All calls to CreateAudioLog()
+  // will be forwarded to |audio_log_factory|, which also must outlive this
+  // class.
+  CastAudioManager(::media::AudioLogFactory* audio_log_factory,
+                   CastAudioOutputDevice* audio_output_device);
+  ~CastAudioManager() override;
+
+  // ::media::AudioManager implementation:
+  bool HasAudioOutputDevices() override;
+  bool HasAudioInputDevices() override;
+  void ShowAudioInputSettings() override;
+  void GetAudioInputDeviceNames(
+      ::media::AudioDeviceNames* device_names) override;
+  ::media::AudioParameters GetInputStreamParameters(
+      const std::string& device_id) override;
+
+  // ::media::AudioManagerBase implementation:
+  ::media::AudioParameters GetPreferredOutputStreamParameters(
+      const std::string& output_device_id,
+      const ::media::AudioParameters& input_params) override;
+  ::media::AudioOutputStream* MakeLinearOutputStream(
+      const ::media::AudioParameters& params) override;
+  ::media::AudioOutputStream* MakeLowLatencyOutputStream(
+      const ::media::AudioParameters& params,
+      const std::string& device_id) override;
+  ::media::AudioInputStream* MakeLinearInputStream(
+      const ::media::AudioParameters& params,
+      const std::string& device_id) override;
+  ::media::AudioInputStream* MakeLowLatencyInputStream(
+      const ::media::AudioParameters& params,
+      const std::string& device_id) override;
+
+  // Get the CastAudioOutputDevice for testing.
+  CastAudioOutputDevice* GetAudioOutputDeviceForTesting() const {
+    return audio_output_device_;
+  }
+
+ private:
+  // Host a ::media::AudioOutputStream interface which wraps a
+  // chromecast::AudioOutputStream.
+  ::media::AudioOutputStream* MakeCastOutputStream(
+      const ::media::AudioParameters& params);
+
+  // The underlying audio output device.
+  CastAudioOutputDevice* const audio_output_device_;
+
+  DISALLOW_COPY_AND_ASSIGN(CastAudioManager);
+};
+
+}  // namespace media
+}  // namespace chromecast
+
+#endif  // CHROMECAST_MEDIA_AUDIO_CAST_AUDIO_MANAGER_H_