Exposes a shlib interface for media/audio path.

chromecast/media/audio/cast_audio_output_stream.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_OUTPUT_STREAM_H_
+#define CHROMECAST_MEDIA_AUDIO_CAST_AUDIO_OUTPUT_STREAM_H_
+
+#include "chromecast/public/cast_audio_stream.h"
+#include "media/audio/audio_io.h"
+#include "media/audio/audio_manager.h"
+#include "media/base/media_export.h"
+
+namespace chromecast {
+struct AudioParameters;
+}
+
+namespace media {
+
+// This class translates between media:: and chromecast:: interfaces.
+class CastAudioOutputStream
+    : public media::AudioOutputStream,
+      public chromecast::AudioOutputStream::AudioSourceCallback {
+ public:
+  CastAudioOutputStream(chromecast::AudioOutputStream* output_stream,
+                        const chromecast::AudioParameters& params);
+  ~CastAudioOutputStream() override;
+
+  // media::AudioOutputStream overrides.
+  bool Open() override;
+  void Start(media::AudioOutputStream::AudioSourceCallback* callback) override;
+  void Stop() override;
+  void SetVolume(double volume) override;
+  void GetVolume(double* volume) override;
+  void Close() override;
+
+  // chromecast::AudioSourceCallback overrides.
+  int OnMoreData(void* dest,
+                 uint32_t len,
+                 int32_t frames,
+                 uint32_t total_bytes_delay) override;
+  void OnError(chromecast::AudioOutputStream* stream) override;
+  void OnClose() override;
+
+ private:
+  // Calls to media::AudioOutputStream overrides will be forwarded here.
+  chromecast::AudioOutputStream* output_stream_;
+  chromecast::AudioParameters params_;
+
+  // Calls to chromecast::AudioSourceCallback overrides will be forwarded here.
+  media::AudioOutputStream::AudioSourceCallback* callback_;
+};
+
+}  // namespace media
+
+#endif  // CHROMECAST_MEDIA_AUDIO_CAST_AUDIO_OUTPUT_STREAM_H_