Implement writing mic audio input data to file for debugging purposes.

media/audio/audio_input_controller.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_AUDIO_INPUT_CONTROLLER_H_
 #define MEDIA_AUDIO_AUDIO_INPUT_CONTROLLER_H_
 
 #include <string>
 #include "base/atomicops.h"
 #include "base/callback.h"
+#include "base/files/file.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread.h"
 #include "base/timer/timer.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_manager_base.h"
 #include "media/audio/audio_parameters.h"
 #include "media/base/audio_bus.h"
@@ skipping 51 matching lines @@
 // audio thread, the controller must not add or release references to the
 // AudioManager or itself (since it in turn holds a reference to the manager).
 //
 namespace media {
 
 // Only do power monitoring for non-mobile platforms to save resources.
 #if !defined(OS_ANDROID) && !defined(OS_IOS)
 #define AUDIO_POWER_MONITORING
 #endif
 
+class AudioInputWriter;
 class UserInputMonitor;
 
 class MEDIA_EXPORT AudioInputController
     : public base::RefCountedThreadSafe<AudioInputController>,
       public AudioInputStream::AudioInputCallback {
  public:
 
   // Error codes to make native loggin more clear. These error codes are added
   // to generic error strings to provide a higher degree of details.
   // Changing these values can lead to problems when matching native debug
@@ skipping 130 matching lines @@
   // AudioInputCallback implementation. Threading details depends on the
   // device-specific implementation.
   void OnData(AudioInputStream* stream,
               const AudioBus* source,
               uint32 hardware_delay_bytes,
               double volume) override;
   void OnError(AudioInputStream* stream) override;
 
   bool SharedMemoryAndSyncSocketMode() const { return sync_writer_ != NULL; }
 
+  // Enable debug recording of audio input.
+  void EnableDebugRecording(AudioInputWriter* input_writer);
+
+  // Disbale debug recording of audio input. Must be called before owner of
+  // |input_writer| deletes it.
+  void DisableDebugRecording(const base::Closure& callback);
+
  protected:
   friend class base::RefCountedThreadSafe<AudioInputController>;
 
   // Internal state of the source.
   enum State {
     CREATED,
     RECORDING,
     CLOSED
   };
 
@@ skipping 54 matching lines @@
 
 #if defined(AUDIO_POWER_MONITORING)
   // Updates the silence state, see enum SilenceState above for state
   // transitions.
   void UpdateSilenceState(bool silence);
 
   // Logs the silence state as UMA stat.
   void LogSilenceState(SilenceState value);
 #endif
 
+  // Enable and disable debug recording of audio input. Called on the audio
+  // thread.
+  void DoEnableDebugRecording(AudioInputWriter* input_writer);
+  void DoDisableDebugRecording();
+
+  // Called on the audio thread.
+  void WriteInputDataForDebugging(scoped_ptr<AudioBus> data);
+
   // Gives access to the task runner of the creating thread.
   scoped_refptr<base::SingleThreadTaskRunner> creator_task_runner_;
 
   // The task runner of audio-manager thread that this object runs on.
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 
   // Contains the AudioInputController::EventHandler which receives state
   // notifications from this class.
   EventHandler* handler_;
 
@@ skipping 43 matching lines @@
 
   // The silence report sent as UMA stat at the end of a session.
   SilenceState silence_state_;
 #endif
 
   size_t prev_key_down_count_;
 
   // Time when a low-latency stream is created.
   base::TimeTicks low_latency_create_time_;
 
+  // Used for audio debug recordings. Accessed on audio thread.
+  AudioInputWriter* input_writer_;
+
   DISALLOW_COPY_AND_ASSIGN(AudioInputController);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_INPUT_CONTROLLER_H_