Add the copresence DirectiveHandler.

components/copresence/mediums/audio/audio_recorder.h

+// 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 COMPONENTS_COPRESENCE_MEDIUMS_AUDIO_AUDIO_RECORDER_
+#define COMPONENTS_COPRESENCE_MEDIUMS_AUDIO_AUDIO_RECORDER_
+
+#include "base/gtest_prod_util.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "media/audio/audio_io.h"
+#include "media/audio/audio_parameters.h"
+#include "media/base/audio_converter.h"
+
+namespace base {
+class MessageLoop;
+}
+
+namespace media {
+class AudioBus;
+}
+
+namespace copresence {
+
+// The AudioRecorder class will record audio until told to stop.
+class AudioRecorder : public media::AudioInputStream::AudioInputCallback,
+                      public media::AudioConverter::InputCallback {
+ public:
+  typedef base::Callback<void(const std::string&)> DecodeSamplesCallback;
+
+  explicit AudioRecorder(const DecodeSamplesCallback& decode_callback);
+
+  // This constructor is only for testing.
+  AudioRecorder(const DecodeSamplesCallback& decode_callback,

[Daniel Erat, 2014/07/28 21:18:19]

could this also be removed in favor of e.g. set_input_stream_for_testing()
setters and a separate Init() method?

[rkc, 2014/07/29 00:33:36]

Done.

+                media::AudioInputStream* input_stream_for_testing,
+                scoped_ptr<media::AudioParameters> params_for_testing);
+
+  void Record();
+  void Stop();
+
+  // Cleans up and deletes this object. Do not use object after this call.
+  void Finalize();
+
+ private:
+  friend class AudioRecorderTest;
+  FRIEND_TEST_ALL_PREFIXES(AudioRecorderTest, BasicRecordAndStop);
+  FRIEND_TEST_ALL_PREFIXES(AudioRecorderTest, OutOfOrderRecordAndStopMultiple);
+
+  virtual ~AudioRecorder();
+
+  // Methods to do our various operations; all of these need to be run on the
+  // audio thread.
+  void InitializeOnAudioThread();
+  void RecordOnAudioThread();
+  void StopOnAudioThread();
+  void StopAndCloseOnAudioThread();
+  void FinalizeOnAudioThread();
+
+  // AudioInputStream::AudioInputCallback overrides:
+  // Called by the audio recorder when a full packet of audio data is
+  // available. This is called from a special audio thread and the
+  // implementation should return as soon as possible.
+  virtual void OnData(media::AudioInputStream* stream,
+                      const media::AudioBus* source,
+                      uint32 hardware_delay_bytes,
+                      double volume) OVERRIDE;
+  virtual void OnError(media::AudioInputStream* stream) OVERRIDE;
+
+  // AudioConverter::InputCallback overrides:
+  virtual double ProvideInput(media::AudioBus* dest,
+                              base::TimeDelta buffer_delay) OVERRIDE;
+
+  // This is used by unit tests, do NOT use in production code.
+  bool IsRecording();

[Daniel Erat, 2014/07/28 21:18:18]

IsRecordingForTesting() or IsRecordingForTest() (chrome appears to use both
styles, unfortunately)

[rkc, 2014/07/29 00:33:36]

This is all gone; replaced this with FlushAudioLoopForTesting.
Done.

+
+  media::AudioInputStream* stream_;
+  bool is_recording_;
+  DecodeSamplesCallback decode_callback_;
+
+  // ProvideInput will use this buffer as its source.
+  const media::AudioBus* temp_conversion_buffer_;
+
+  // Past the initialization, only access the next variables on

[Daniel Erat, 2014/07/28 21:18:18]

nit: s/Past the initialization/Outside of the constructor/?

[rkc, 2014/07/29 00:33:36]

Done.

+  // the recording thread.
+  scoped_ptr<media::AudioBus> buffer_;
+  int total_buffer_frames_;
+  int buffer_frame_index_;
+
+  scoped_ptr<media::AudioConverter> converter_;
+
+  media::AudioInputStream* input_stream_for_testing_;
+  scoped_ptr<media::AudioParameters> params_for_testing_;
+
+  DISALLOW_COPY_AND_ASSIGN(AudioRecorder);
+};
+
+}  // namespace copresence
+
+#endif  // COMPONENTS_COPRESENCE_MEDIUMS_AUDIO_AUDIO_RECORDER_