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+// Copyright 2014 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 PPAPI_CPP_MEDIA_STREAM_AUDIO_TRACK_H_
+#define PPAPI_CPP_MEDIA_STREAM_AUDIO_TRACK_H_
+
+#include <string>
+
+#include "ppapi/c/ppb_media_stream_audio_track.h"
+#include "ppapi/cpp/resource.h"
+#include "ppapi/cpp/var.h"
+
+/// @file
+/// This file defines the <code>MediaStreamAudioTrack</code> interface for an
+/// audio source resource, which receives audio buffers from a MediaStream audio
+/// track in the browser.
+
+namespace pp {
+
+class AudioBuffer;
+class CompletionCallback;
+template <typename T> class CompletionCallbackWithOutput;
+
+/// The <code>MediaStreamAudioTrack</code> class contains methods for
+/// receiving audio buffers from a MediaStream audio track in the browser.
+class MediaStreamAudioTrack : public Resource {
+ public:
+  /// Default constructor for creating an is_null()
+  /// <code>MediaStreamAudioTrack</code> object.
+  MediaStreamAudioTrack();
+
+  /// The copy constructor for <code>MediaStreamAudioTrack</code>.
+  ///
+  /// @param[in] other A reference to a <code>MediaStreamAudioTrack</code>.
+  MediaStreamAudioTrack(const MediaStreamAudioTrack& other);
+
+  /// Constructs a <code>MediaStreamAudioTrack</code> from
+  /// a <code>Resource</code>.
+  ///
+  /// @param[in] resource A <code>PPB_MediaStreamAudioTrack</code> resource.
+  explicit MediaStreamAudioTrack(const Resource& resource);
+
+  /// A constructor used when you have received a <code>PP_Resource</code> as a
+  /// return value that has had 1 ref added for you.
+  ///
+  /// @param[in] resource A <code>PPB_MediaStreamAudioTrack</code> resource.
+  MediaStreamAudioTrack(PassRef, PP_Resource resource);
+
+  ~MediaStreamAudioTrack();
+
+  /// Configures underlying buffer buffers for incoming audio samples.
+  /// If the application doesn't want to drop samples, then the
+  /// <code>PP_MEDIASTREAMAUDIOTRACK_ATTRIB_BUFFERS</code> should be
+  /// chosen such that inter-buffer processing time variability won't overrun
+  /// all input buffers. If all buffers are filled, then samples will be
+  /// dropped. The application can detect this by examining the timestamp on
+  /// returned buffers. If <code>Configure()</code> is not called, default
+  /// settings will be used. Calls to Configure while the plugin holds
+  /// buffers will fail.
+  /// Example usage from plugin code:
+  /// @code
+  /// int32_t attribs[] = {
+  ///     PP_MEDIASTREAMAUDIOTRACK_ATTRIB_BUFFERS, 4,
+  ///     PP_MEDIASTREAMAUDIOTRACK_ATTRIB_DURATION, 10,
+  ///     PP_MEDIASTREAMAUDIOTRACK_ATTRIB_NONE};
+  /// track.Configure(attribs, callback);
+  /// @endcode
+  ///
+  /// @param[in] attrib_list A list of attribute name-value pairs in which each
+  /// attribute is immediately followed by the corresponding desired value.
+  /// The list is terminated by
+  /// <code>PP_MEDIASTREAMAUDIOTRACK_AUDIO_NONE</code>.
+  /// @param[in] callback A <code>CompletionCallback</code> to be called upon
+  /// completion of <code>Configure()</code>.
+  ///
+  /// @return An int32_t containing a result code from <code>pp_errors.h</code>.
+  int32_t Configure(const int32_t attributes[],
+                    const CompletionCallback& callback);
+
+  /// Gets attribute value for a given attribute name.
+  ///
+  /// @param[in] attrib A <code>PP_MediaStreamAudioTrack_Attrib</code> for
+  /// querying.
+  /// @param[out] value A int32_t for storing the attribute value.
+  ///
+  /// @return An int32_t containing a result code from <code>pp_errors.h</code>.
+  int32_t GetAttrib(PP_MediaStreamAudioTrack_Attrib attrib,
+                    int32_t* value);
+
+  /// Returns the track ID of the underlying MediaStream audio track.
+  std::string GetId() const;
+
+  /// Checks whether the underlying MediaStream track has ended.
+  /// Calls to GetBuffer while the track has ended are safe to make and will
+  /// complete, but will fail.
+  bool HasEnded() const;
+
+  /// Gets the next audio buffer from the MediaStream track.
+  /// If internal processing is slower than the incoming buffer rate,
+  /// new buffers will be dropped from the incoming stream. Once all buffers
+  /// are full, audio samples will be dropped until <code>RecycleBuffer()</code>
+  /// is called to free a spot for another buffer.
+  /// If there are no audio data in the input buffer,
+  /// <code>PP_OK_COMPLETIONPENDING</code> will be returned immediately and the
+  /// <code>callback</code> will be called when a new buffer of audio samples
+  /// is received or some error happens.
+  ///
+  /// @param[in] callback A <code>CompletionCallbackWithOutput</code> to be
+  /// called upon completion of <code>GetBuffer()</code>. If success,
+  /// an AudioBuffer will be passed into the completion callback function.
+  ///
+  /// @return An int32_t containing a result code from <code>pp_errors.h</code>.
+  int32_t GetBuffer(
+      const CompletionCallbackWithOutput<AudioBuffer>& callback);
+
+  /// Recycles a buffer returned by <code>GetBuffer()</code>, so the track can
+  /// reuse the buffer. And the buffer will become invalid. The caller should
+  /// release all references it holds to <code>buffer</code> and not use it
+  /// anymore.
+  ///
+  /// @param[in] buffer A AudioBuffer returned by <code>GetBuffer()</code>.
+  ///
+  /// @return An int32_t containing a result code from <code>pp_errors.h</code>.
+  int32_t RecycleBuffer(const AudioBuffer& buffer);
+
+  /// Closes the MediaStream audio track, and disconnects it from the audio
+  /// source.
+  /// After calling <code>Close()</code>, no new buffers will be received.
+  void Close();
+
+  /// Checks whether a <code>Resource</code> is a MediaStream audio track,
+  /// to test whether it is appropriate for use with the
+  /// <code>MediaStreamAudioTrack</code> constructor.
+  ///
+  /// @param[in] resource A <code>Resource</code> to test.
+  ///
+  /// @return True if <code>resource</code> is a MediaStream audio track.
+  static bool IsMediaStreamAudioTrack(const Resource& resource);
+};
+
+}  // namespace pp
+
+#endif  // PPAPI_CPP_MEDIA_STREAM_AUDIO_TRACK_H_