Moved the fake input stream's processing onto the audio worker thread.

media/audio/fake_audio_consumer.h

-// Copyright (c) 2013 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 MEDIA_AUDIO_FAKE_AUDIO_CONSUMER_H_
-#define MEDIA_AUDIO_FAKE_AUDIO_CONSUMER_H_
-
-#include "base/callback_forward.h"
-#include "base/memory/ref_counted.h"
-#include "media/base/media_export.h"
-
-namespace base {
-class SingleThreadTaskRunner;
-}
-
-namespace media {
-class AudioBus;
-class AudioParameters;
-
-// A fake audio consumer.  Using a provided message loop, FakeAudioConsumer will
-// simulate a real time consumer of audio data.
-class MEDIA_EXPORT FakeAudioConsumer {
- public:
-  // |worker_task_runner| is the task runner on which the ReadCB provided to
-  // Start() will be executed on.  This may or may not be the be for the same
-  // thread that invokes the Start/Stop methods.
-  // |params| is used to determine the frequency of callbacks.
-  FakeAudioConsumer(
-      const scoped_refptr<base::SingleThreadTaskRunner>& worker_task_runner,
-      const AudioParameters& params);
-  ~FakeAudioConsumer();
-
-  // Start executing |read_cb| at a regular intervals.  Stop() must be called by
-  // the same thread before destroying FakeAudioConsumer.
-  typedef base::Callback<void(AudioBus* audio_bus)> ReadCB;
-  void Start(const ReadCB& read_cb);
-
-  // Stop executing the ReadCB provided to Start().  Blocks until the worker
-  // loop is not inside a ReadCB invocation.  Safe to call multiple times.  Must
-  // be called on the same thread that called Start().
-  void Stop();
-
- private:
-  // All state and implementation is kept within this ref-counted class because
-  // cancellation of posted tasks must happen on the worker thread some time
-  // after the call to Stop() (on the main thread) returns.
-  class Worker;
-  const scoped_refptr<Worker> worker_;
-
-  DISALLOW_COPY_AND_ASSIGN(FakeAudioConsumer);
-};
-
-}  // namespace media
-
-#endif  // MEDIA_AUDIO_FAKE_AUDIO_CONSUMER_H_