Exposes a shlib interface for media/audio path.

chromecast/public/cast_audio_output_device.h

Index: chromecast/public/cast_audio_output_device.h
diff --git a/chromecast/public/cast_audio_output_device.h b/chromecast/public/cast_audio_output_device.h
new file mode 100644
index 0000000000000000000000000000000000000000..d98461c133312c67a41bf7d8457807890c8b2fd0
--- /dev/null
+++ b/chromecast/public/cast_audio_output_device.h
@@ -0,0 +1,42 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.

[byungchul, 2015/04/27 17:38:06]

You should add these 2 public header files in cast_public_api target in
chromecast.gyp

[slan, 2015/04/28 00:11:39]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROMECAST_PUBLIC_CAST_AUDIO_OUTPUT_DEVICE_H_
+#define CHROMECAST_PUBLIC_CAST_AUDIO_OUTPUT_DEVICE_H_
+
+#include "cast_audio_stream.h"
+#include "chromecast_export.h"
+
+namespace chromecast {
+
+// This is an interface used to provide platform-specific audio streams.
+// Implementations of this interface should survive for the duration of the
+// process.
+
+// Note: This interface should be implemented by third parties seeking to
+// provide an audio manager platform for Cast. CastAudioManager will call
+// this interface.
+
+class CHROMECAST_EXPORT CastAudioOutputDevice {
+ public:
+  virtual ~CastAudioOutputDevice() {}
+
+  // Returns the maximum number of output streams allowed.
+  virtual int GetMaximumOutputStreamsAllowed() const = 0;
+
+  // Returns the preferred output stream parameters. The caller may inject
+  // |suggested| parameters, but it is left to the implementation to decide
+  // which of these to return.
+  virtual AudioParameters GetPreferredOutputStreamParameters(
+      const AudioParameters& suggested) const = 0;
+
+  // Creates the output stream with parameters described by |params|. Caller
+  // does not take ownership of the returned stream.
+  virtual CastAudioOutputStream* MakeOutputStream(
+      const AudioParameters& params) = 0;
+};
+
+}  // namespace chromecast
+
+#endif  // CHROMECAST_PUBLIC_CAST_AUDIO_OUTPUT_DEVICE_H_