Audio output debug recording.

media/audio/audio_output_resampler.h

Index: media/audio/audio_output_resampler.h
diff --git a/media/audio/audio_output_resampler.h b/media/audio/audio_output_resampler.h
index da512e09ebc345934a326a8c367678f639678067..38dd6c182c7fbfff8905c72ce2596e77ecaa871f 100644
--- a/media/audio/audio_output_resampler.h
+++ b/media/audio/audio_output_resampler.h
@@ -31,6 +31,16 @@ class OnMoreDataConverter;
 // parameters. If opening still fails, it will fallback to AUDIO_FAKE.
 class MEDIA_EXPORT AudioOutputResampler : public AudioOutputDispatcher {
  public:
+  // Callbacks for debug recording. RegisterDebugRecordingSourceCallback is used
+  // for registering a stream so that recording can be setup. The Unregister-
+  // counterpart ungeisters for shutting down recording. DebugRecordingCallback
+  // is used for passing data. The int in all callbacks is a unique id to
+  // identify the stream.
+  using RegisterDebugRecordingSourceCallback =
+      base::Callback<void(int, const AudioParameters&)>;
+  using UnregisterDebugRecordingSourceCallback = base::Callback<void(int)>;
+  using DebugRecordingCallback = base::Callback<void(int, AudioBus*)>;
+
   AudioOutputResampler(AudioManager* audio_manager,
                        const AudioParameters& input_params,
                        const AudioParameters& output_params,
@@ -47,6 +57,14 @@ class MEDIA_EXPORT AudioOutputResampler : public AudioOutputDispatcher {
   void StreamVolumeSet(AudioOutputProxy* stream_proxy, double volume) override;
   void CloseStream(AudioOutputProxy* stream_proxy) override;
 
+  // Sets debug recording callbacks. See comment on callback definitions above.
+  void SetDebugRecordingCallbacks(
+      const RegisterDebugRecordingSourceCallback&
+          register_debug_recording_source_callback,
+      const UnregisterDebugRecordingSourceCallback&
+          unregister_debug_recording_source_callback,
+      const DebugRecordingCallback& debug_recording_callback);
+
  private:
   using CallbackMap =
       std::map<AudioOutputProxy*, std::unique_ptr<OnMoreDataConverter>>;
@@ -90,6 +108,13 @@ class MEDIA_EXPORT AudioOutputResampler : public AudioOutputDispatcher {
   // to a fake stream indefinitely for transient errors.
   base::Timer reinitialize_timer_;
 
+  // Used for audio debug recordings. See comment on callback definitions above.
+  RegisterDebugRecordingSourceCallback
+      register_debug_recording_source_callback_;
+  UnregisterDebugRecordingSourceCallback
+      unregister_debug_recording_source_callback_;
+  DebugRecordingCallback debug_recording_callback_;
+
   base::WeakPtrFactory<AudioOutputResampler> weak_factory_;
   DISALLOW_COPY_AND_ASSIGN(AudioOutputResampler);
 };