Creating the audio_modem component

components/copresence/mediums/audio/audio_player_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_PLAYER_IMPL_H_
-#define COMPONENTS_COPRESENCE_MEDIUMS_AUDIO_AUDIO_PLAYER_IMPL_H_
-
-#include <vector>
-
-#include "base/gtest_prod_util.h"
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/synchronization/lock.h"
-#include "components/copresence/mediums/audio/audio_player.h"
-#include "media/audio/audio_io.h"
-
-namespace media {
-class AudioBus;
-class AudioBusRefCounted;
-}
-
-namespace copresence {
-
-// The AudioPlayerImpl class will play a set of samples till it is told to stop.
-class AudioPlayerImpl final
-    : public AudioPlayer,
-      public media::AudioOutputStream::AudioSourceCallback {
- public:
-  AudioPlayerImpl();
-
-  // AudioPlayer overrides:
-  void Initialize() override;
-  void Play(const scoped_refptr<media::AudioBusRefCounted>& samples) override;
-  void Stop() override;
-  void Finalize() override;
-
-  // Takes ownership of the stream.
-  void set_output_stream_for_testing(
-      media::AudioOutputStream* output_stream_for_testing) {
-    output_stream_for_testing_.reset(output_stream_for_testing);
-  }
-
- private:
-  friend class AudioPlayerTest;
-  FRIEND_TEST_ALL_PREFIXES(AudioPlayerTest, BasicPlayAndStop);
-  FRIEND_TEST_ALL_PREFIXES(AudioPlayerTest, OutOfOrderPlayAndStopMultiple);
-
-  ~AudioPlayerImpl() override;
-
-  // Methods to do our various operations; all of these need to be run on the
-  // audio thread.
-  void InitializeOnAudioThread();
-  void PlayOnAudioThread(
-      const scoped_refptr<media::AudioBusRefCounted>& samples);
-  void StopOnAudioThread();
-  void StopAndCloseOnAudioThread();
-  void FinalizeOnAudioThread();
-
-  // AudioOutputStream::AudioSourceCallback overrides:
-  // Following methods could be called from *ANY* thread.
-  int OnMoreData(media::AudioBus* dest, uint32 total_bytes_delay) override;
-  void OnError(media::AudioOutputStream* stream) override;
-
-  // Flushes the audio loop, making sure that any queued operations are
-  // performed.
-  void FlushAudioLoopForTesting();
-
-  bool is_playing_;
-
-  // Self-deleting object.
-  media::AudioOutputStream* stream_;
-
-  scoped_ptr<media::AudioOutputStream> output_stream_for_testing_;
-
-  // All fields below here are protected by this lock.
-  base::Lock state_lock_;
-
-  scoped_refptr<media::AudioBusRefCounted> samples_;
-
-  // Index to the frame in the samples that we need to play next.
-  int frame_index_;
-
-  DISALLOW_COPY_AND_ASSIGN(AudioPlayerImpl);
-};
-
-}  // namespace copresence
-
-#endif  // COMPONENTS_COPRESENCE_MEDIUMS_AUDIO_AUDIO_PLAYER_IMPL_H_