Exposes a shlib interface for media/audio path.

chromecast/media/audio/chromecast_device_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_CHROMECAST_DEVICE_AUDIO_OUTPUT_STREAM_H_
+#define CHROMECAST_MEDIA_AUDIO_CHROMECAST_DEVICE_AUDIO_OUTPUT_STREAM_H_
+
+#include "base/macros.h"
+#include "chromecast/media/audio/cast_audio_manager.h"
+#include "chromecast/public/media/cast_audio_output_stream.h"
+#include "media/audio/audio_io.h"
+#include "media/base/media_export.h"
+
+namespace chromecast {
+namespace media {
+
+struct AudioParameters;
+
+// An implementation of ::media::AudioOutputStream for any Chromecast device.
+// This passes control requests and data to an instance of the platform-
+// independent chromecast::CastAudioOutputStream interface.
+class ChromecastDeviceAudioOutputStream
+    : private CastAudioOutputStream::AudioSourceCallback,
+      public ::media::AudioOutputStream {
+ public:
+  // |output_stream| is provided and owned by the global instance of
+  // CastAudioOutputDevice. This class does not take ownership. This
+  // implementation currently supports the following types for audio samples:
+  //   uint8_t, int16_t, int32_t
+  // |params|.bits_per_sample must hold 8, 16, or 32, respectively.
+  ChromecastDeviceAudioOutputStream(CastAudioOutputStream* output_stream,
+                                    const AudioParameters& params,
+                                    CastAudioManager* manager);
+  ~ChromecastDeviceAudioOutputStream() override;
+
+  // ::media::AudioOutputStream implementation:
+  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 implementation:
+  int GetMoreData(void* dest,
+                  uint32_t len,
+                  int32_t frames,
+                  uint32_t total_bytes_delay) override;
+  void OnError(CastAudioOutputStream* stream) override;
+
+ private:
+  // Calls to ::media::AudioOutputStream interface will be forwarded here.
+  CastAudioOutputStream* output_stream_;
+
+  // Calls to chromecast::AudioSourceCallback interface will be forwarded here.
+  ::media::AudioOutputStream::AudioSourceCallback* callback_;
+
+  // The parameters describing the stream.
+  const AudioParameters params_;
+
+  // The manager that owns this stream. Alert |manager_| when |this| closes.
+  CastAudioManager* audio_manager_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromecastDeviceAudioOutputStream);
+};
+
+}  // namespace media
+}  // namespace chromecast
+
+#endif  // CHROMECAST_MEDIA_AUDIO_CHROMECAST_DEVICE_AUDIO_OUTPUT_STREAM_H_