Make fake file audio input device not crash when it fails to read.

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 "base/files/file_path.h"
 #include "base/synchronization/lock.h"
 #include "media/audio/audio_io.h"
@@ skipping 48 matching lines @@
   int OnMoreData(AudioBus* audio_bus, uint32 total_bytes_delay) override;
   void OnError(AudioOutputStream* stream) override;
 
  private:
   AudioParameters params_;
   base::FilePath path_to_wav_file_;
   scoped_ptr<uint8[]> wav_file_data_;
   scoped_ptr<WavAudioHandler> wav_audio_handler_;
   scoped_ptr<AudioConverter> file_audio_converter_;
   int wav_file_read_pos_;
+  bool load_failed_;
 
   // Provides audio data from wav_audio_handler_ into the file audio converter.
   double ProvideInput(AudioBus* audio_bus,
                       base::TimeDelta buffer_delay) override;
 
   // Loads the wav file on the first OnMoreData invocation.
   void LoadWavFile(const base::FilePath& path_to_wav_file);
 };
 
 class BeepingSource : public AudioOutputStream::AudioSourceCallback {
@@ skipping 13 matching lines @@
   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_