Split out audio debug recording from RenderProcessHostImpl.

content/renderer/media/audio_debug_recorder.h

Index: content/renderer/media/audio_debug_recorder.h
diff --git a/content/renderer/media/audio_debug_recorder.h b/content/renderer/media/audio_debug_recorder.h
new file mode 100644
index 0000000000000000000000000000000000000000..d731e1418d517eb0f91da4171cff52ef24b3e6e2
--- /dev/null
+++ b/content/renderer/media/audio_debug_recorder.h
@@ -0,0 +1,86 @@
+// Copyright 2015 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 CONTENT_RENDERER_MEDIA_AUDIO_DEBUG_RECORDER_H_
+#define CONTENT_RENDERER_MEDIA_AUDIO_DEBUG_RECORDER_H_
+
+#include <map>
+
+#include "base/containers/scoped_ptr_map.h"
+#include "base/files/file.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/threading/thread_checker.h"
+#include "content/common/content_export.h"
+#include "content/common/media/audio_debug_recording.mojom.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}
+
+namespace content {
+
+class ServiceRegistry;
+
+// MessageFilter that handles AEC dump messages and forwards them to an
+// observer.
+class CONTENT_EXPORT AudioDebugRecorder
+    : public base::RefCountedThreadSafe<AudioDebugRecorder> {
+ public:
+  class AecDumpDelegate {
+   public:
+    virtual void OnAecDumpFile(base::PlatformFile file_handle) = 0;
+    virtual void OnDisableAecDump() = 0;
+    virtual void OnIpcClosing() = 0;
+  };
+
+  explicit AudioDebugRecorder(ServiceRegistry* service_registry);
+
+  // Getter for the one AudioDebugRecorder object.
+  static scoped_refptr<AudioDebugRecorder> Get();
+
+  // Adds a delegate that receives the enable and disable notifications.
+  void AddDelegate(AudioDebugRecorder::AecDumpDelegate* delegate);
+
+  // Removes a delegate.
+  void RemoveDelegate(AudioDebugRecorder::AecDumpDelegate* delegate);
+
+ private:
+  friend class base::RefCountedThreadSafe<AudioDebugRecorder>;
+  ~AudioDebugRecorder();
+
+  class Observer;
+
+  void OnConnectionError();
+
+  // Accessed on |main_task_runner_|.
+  void DoEnableAecDump(int id, base::PlatformFile file_handle);
+  void DoDisableAecDump();
+  int GetIdForDelegate(AudioDebugRecorder::AecDumpDelegate* delegate);
+
+  AudioDebugRecordingPtr service_;
+
+  // The delgates for this filter. Must only be accessed on
+  // |main_task_runner_|.
+  typedef std::map<int, AudioDebugRecorder::AecDumpDelegate*> DelegateMap;
+  DelegateMap delegates_;
+
+  using ObserverMap = base::ScopedPtrMap<int, scoped_ptr<Observer>>;

[Henrik Grunell, 2015/10/15 12:17:03]

What are the observers for? Comment would be good.

[Anand Mistry (off Chromium), 2015/10/21 03:58:24]

Done. Updated a bunch of comments.

+  ObserverMap observers_;
+
+  // Counter for generating unique IDs to delegates. Accessed on
+  // |main_task_runner_|.
+  int delegate_id_counter_;
+
+  // The singleton instance for this filter.
+  static AudioDebugRecorder* g_filter;
+
+  base::ThreadChecker thread_checker_;
+
+  DISALLOW_COPY_AND_ASSIGN(AudioDebugRecorder);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_MEDIA_AUDIO_DEBUG_RECORDER_H_