Creating the audio_modem component

components/copresence/mediums/audio/audio_recorder_impl.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_IMPL_H_
-#define COMPONENTS_COPRESENCE_MEDIUMS_AUDIO_AUDIO_RECORDER_IMPL_H_
-
-#include <string>
-
-#include "base/gtest_prod_util.h"
-#include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
-#include "components/copresence/mediums/audio/audio_recorder.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 AudioRecorderImpl final
-    : public AudioRecorder,
-      public media::AudioInputStream::AudioInputCallback,
-      public media::AudioConverter::InputCallback {
- public:
-  using RecordedSamplesCallback = base::Callback<void(const std::string&)>;
-
-  AudioRecorderImpl();
-
-  // AudioRecorder overrides:
-  void Initialize(const RecordedSamplesCallback& decode_callback) override;
-  void Record() override;
-  void Stop() override;
-  void Finalize() override;
-
-  // Takes ownership of the stream.
-  void set_input_stream_for_testing(
-      media::AudioInputStream* input_stream_for_testing) {
-    input_stream_for_testing_.reset(input_stream_for_testing);
-  }
-
-  // Takes ownership of the params.
-  void set_params_for_testing(media::AudioParameters* params_for_testing) {
-    params_for_testing_.reset(params_for_testing);
-  }
-
- protected:
-  ~AudioRecorderImpl() override;
-  void set_is_recording(bool is_recording) { is_recording_ = is_recording; }
-
- private:
-  friend class AudioRecorderTest;
-  FRIEND_TEST_ALL_PREFIXES(AudioRecorderTest, BasicRecordAndStop);
-  FRIEND_TEST_ALL_PREFIXES(AudioRecorderTest, OutOfOrderRecordAndStopMultiple);
-
-  // 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.
-  void OnData(media::AudioInputStream* stream,
-              const media::AudioBus* source,
-              uint32 hardware_delay_bytes,
-              double volume) override;
-  void OnError(media::AudioInputStream* stream) override;
-
-  // AudioConverter::InputCallback overrides:
-  double ProvideInput(media::AudioBus* dest,
-                      base::TimeDelta buffer_delay) override;
-
-  // Flushes the audio loop, making sure that any queued operations are
-  // performed.
-  void FlushAudioLoopForTesting();
-
-  bool is_recording_;
-
-  media::AudioInputStream* stream_;
-
-  RecordedSamplesCallback decode_callback_;
-
-  // ProvideInput will use this buffer as its source.
-  const media::AudioBus* temp_conversion_buffer_;
-
-  // Outside of the ctor/Initialize method, only access the next variables on
-  // the recording thread.
-  scoped_ptr<media::AudioBus> buffer_;
-  int total_buffer_frames_;
-  int buffer_frame_index_;
-
-  scoped_ptr<media::AudioConverter> converter_;
-
-  scoped_ptr<media::AudioInputStream> input_stream_for_testing_;
-  scoped_ptr<media::AudioParameters> params_for_testing_;
-
-  DISALLOW_COPY_AND_ASSIGN(AudioRecorderImpl);
-};
-
-}  // namespace copresence
-
-#endif  // COMPONENTS_COPRESENCE_MEDIUMS_AUDIO_AUDIO_RECORDER_IMPL_H_