Make fake audio file playback loop by default.

media/audio/simple_sources.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.
 
 #ifndef MEDIA_AUDIO_SIMPLE_SOURCES_H_
 #define MEDIA_AUDIO_SIMPLE_SOURCES_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 40 matching lines @@
   int cap_;
   int callbacks_;
   int errors_;
   base::Lock time_lock_;
 };
 
 class MEDIA_EXPORT FileSource : public AudioOutputStream::AudioSourceCallback,
                                 public AudioConverter::InputCallback {
  public:
   FileSource(const AudioParameters& params,
-             const base::FilePath& path_to_wav_file);
+             const base::FilePath& path_to_wav_file,
+             bool loop);
   ~FileSource() override;
 
   // Implementation of AudioSourceCallback.
   int OnMoreData(AudioBus* audio_bus,
                  uint32_t total_bytes_delay,
                  uint32_t frames_skipped) override;
   void OnError(AudioOutputStream* stream) override;
 
  private:
   AudioParameters params_;
   base::FilePath path_to_wav_file_;
 
   // The WAV data at |path_to_wav_file_| is read into memory and kept here.
   // This memory needs to survive for the lifetime of |wav_audio_handler_|,
   // so declare it first. Do not access this member directly.
   std::unique_ptr<char[]> raw_wav_data_;
 
   std::unique_ptr<WavAudioHandler> wav_audio_handler_;
   std::unique_ptr<AudioConverter> file_audio_converter_;
   int wav_file_read_pos_;
   bool load_failed_;
+  bool looping_;
 
   // Provides audio data from wav_audio_handler_ into the file audio converter.
   double ProvideInput(AudioBus* audio_bus, uint32_t frames_delayed) override;
 
   // Loads the wav file on the first OnMoreData invocation.
   void LoadWavFile(const base::FilePath& path_to_wav_file);
+
+  // Rewinds the player to the start of the loaded wav file.
+  void Rewind();
 };
 
 class BeepingSource : public AudioOutputStream::AudioSourceCallback {
  public:
   BeepingSource(const AudioParameters& params);
   ~BeepingSource() override;
 
   // Implementation of AudioSourceCallback.
   int OnMoreData(AudioBus* audio_bus,
                  uint32_t total_bytes_delay,
                  uint32_t frames_skipped) override;
   void OnError(AudioOutputStream* stream) override;
 
   static void BeepOnce();
  private:
   int buffer_size_;
   std::unique_ptr<uint8_t[]> buffer_;
   AudioParameters params_;
   base::TimeTicks last_callback_time_;
   base::TimeDelta interval_from_last_beep_;
   int beep_duration_in_buffers_;
   int beep_generated_in_buffers_;
   int beep_period_in_frames_;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_SIMPLE_SOURCES_H_