Added WebRTC audio quality test using fake device; improved fake device

media/audio/fake_audio_input_stream.h

 // Copyright (c) 2012 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.
 //
 // A fake implementation of AudioInputStream, useful for testing purpose.
 
 #ifndef MEDIA_AUDIO_FAKE_AUDIO_INPUT_STREAM_H_
 #define MEDIA_AUDIO_FAKE_AUDIO_INPUT_STREAM_H_
 
 #include <vector>
 
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread.h"
 #include "base/time/time.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_parameters.h"
 #include "media/audio/sounds/wav_audio_handler.h"
+#include "media/base/audio_converter.h"
 
 namespace media {
 
 class AudioBus;
 class AudioManagerBase;
 
 // This class can either generate a beep sound or play audio from a file.
 class MEDIA_EXPORT FakeAudioInputStream
-    : public AudioInputStream {
+    : public AudioInputStream, AudioConverter::InputCallback {
  public:
   static AudioInputStream* MakeFakeStream(
       AudioManagerBase* manager, const AudioParameters& params);
 
   bool Open() override;
   void Start(AudioInputCallback* callback) override;
   void Stop() override;
   void Close() override;
   double GetMaxVolume() override;
   void SetVolume(double volume) override;
@@ skipping 37 matching lines @@
   const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   base::TimeTicks last_callback_time_;
   base::TimeDelta callback_interval_;
   base::TimeDelta interval_from_last_beep_;
   int beep_duration_in_buffers_;
   int beep_generated_in_buffers_;
   int beep_period_in_frames_;
   scoped_ptr<media::AudioBus> audio_bus_;
   scoped_ptr<uint8[]> wav_file_data_;
   scoped_ptr<media::WavAudioHandler> wav_audio_handler_;
+  scoped_ptr<media::AudioConverter> file_audio_converter_;
   int wav_file_read_pos_;
 
   // Allows us to run tasks on the FakeAudioInputStream instance which are
   // bound by its lifetime.
   base::WeakPtrFactory<FakeAudioInputStream> weak_factory_;
 
+  // If running in file mode, this provides audio data from wav_audio_handler_.
+  double ProvideInput(AudioBus* audio_bus,
+                      base::TimeDelta buffer_delay) override;
+
   DISALLOW_COPY_AND_ASSIGN(FakeAudioInputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_FAKE_AUDIO_INPUT_STREAM_H_