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"

[lcwu1, 2015/04/24 02:18:24]

Keep a vertical space between C++ system headers and project's headers.

[slan, 2015/04/24 05:34:26]

Done.

+#include "base/memory/linked_ptr.h"
+#include "media/audio/audio_manager_base.h"
+
+namespace chromecast {
+class CastAudioStreamProvider;
+}
+
+namespace media {

[lcwu1, 2015/04/24 02:18:24]

Any reason why you want this to be outside of chromecast namespace?

[slan, 2015/04/24 05:34:26]

I did this to add readability and avoid name collisions between chromecast
interfaces that mirror media interfaces, and implementations of media interfaces
(i.e. CastAudioOutputStream could be seen as either, without context).

This is probably an abuse of the feature. I think that I can work out a better
naming scheme for the next patch, putting all of this in the chromecast
namespace.

+
+class AudioLogFactory;
+class CastAudioOutputStream;
+
+class MEDIA_EXPORT CastAudioManager : public AudioManagerBase {
+ public:
+  // This class acts as a proxy for chromecast::CastAudioStreamProvider,
+  // converting external-facing chromecast interfces and data structures to
+  // those expected by media::AudioManager. It does not take ownership of
+  // |audio_stream_provider|, 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(AudioLogFactory* audio_log_factory,
+                   chromecast::CastAudioStreamProvider* audio_stream_provider);
+  ~CastAudioManager() override;
+
+  // AudioManager overrides.

[lcwu1, 2015/04/24 02:18:24]

Our convention is to use

// AudioManager implementation:

[slan, 2015/04/24 05:34:26]

Done.

+  bool HasAudioOutputDevices() override;
+  bool HasAudioInputDevices() override;
+  void ShowAudioInputSettings() override;
+  void GetAudioInputDeviceNames(AudioDeviceNames* device_names) override;
+  AudioParameters GetInputStreamParameters(
+      const std::string& device_id) override;
+
+  // AudioManagerBase overrides.
+  AudioParameters GetPreferredOutputStreamParameters(
+      const std::string& output_device_id,
+      const AudioParameters& input_params) override;
+  AudioOutputStream* MakeLinearOutputStream(
+      const AudioParameters& params) override;
+  AudioOutputStream* MakeLowLatencyOutputStream(
+      const AudioParameters& params,
+      const std::string& device_id) override;
+  AudioInputStream* MakeLinearInputStream(
+      const AudioParameters& params,
+      const std::string& device_id) override;
+  AudioInputStream* MakeLowLatencyInputStream(
+      const AudioParameters& params,
+      const std::string& device_id) override;
+
+ private:
+  // Host a media::AudioOutputStream interface which wraps a
+  // chromecast::AudioOutputStream.
+  AudioOutputStream* MakeCastOutputStream(const AudioParameters& params);
+
+  // Bindings between media and chromecast audio streams.
+  std::vector<linked_ptr<CastAudioOutputStream>> streams_;
+  chromecast::CastAudioStreamProvider* audio_stream_provider_;
+
+  DISALLOW_COPY_AND_ASSIGN(CastAudioManager);
+};
+
+}  // namespace media
+
+#endif  // CHROMECAST_MEDIA_AUDIO_CAST_AUDIO_MANAGER_H_