Audio output debug recording.

media/audio/audio_file_writer.h

Index: media/audio/audio_file_writer.h
diff --git a/media/audio/audio_file_writer.h b/media/audio/audio_file_writer.h
index dabfa23dd95566b78e32f34e6312a5608a9a2b9d..6ed92c5a8699c3b08063ef1214460829b17816bb 100644
--- a/media/audio/audio_file_writer.h
+++ b/media/audio/audio_file_writer.h
@@ -7,6 +7,8 @@
 
 #include <memory>
 
+#include "base/callback_forward.h"
+
 namespace base {
 class FilePath;
 }
@@ -14,6 +16,7 @@ class FilePath;
 namespace media {
 
 class AudioBus;
+class AudioParameters;
 
 // A writer interface used for writing audio data to file for debugging
 // purposes.
@@ -38,8 +41,18 @@ class AudioFileWriter {
   // may be ambigulous if Start() or Stop() is executed at the moment. Can be
   // called from any sequence.
   virtual bool WillWrite() = 0;
+
+  // Gets the extension for the file type the as a string, for example "wav".
+  // Can be called before calling Start() to add the appropriate extension to
+  // the filename.
+  virtual std::string GetExtension() = 0;
 };
 
-}  // namespace media
+// Used for creating an AudioFileWriter.
+using CreateAudioFileWriterCallback =
+    base::RepeatingCallback<std::unique_ptr<AudioFileWriter>(

[o1ka, 2017/02/09 13:04:03]

Declare in within AudioFileWriter scope and call it |CreateCallback| ? 

[Henrik Grunell, 2017/02/10 09:00:56]

Sounds good, done.

+        const AudioParameters&)>;
+
+}  // namspace media
 
 #endif  // MEDIA_AUDIO_AUDIO_FILE_WRITER_H_