Support multiple files for AEC dump.

content/renderer/media/aec_dump_message_filter.h

+// Copyright 2014 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_AEC_DUMP_MESSAGE_FILTER_H_
+#define CONTENT_RENDERER_MEDIA_AEC_DUMP_MESSAGE_FILTER_H_
+
+#include "base/gtest_prod_util.h"
+#include "base/memory/scoped_ptr.h"
+#include "content/common/content_export.h"
+#include "content/renderer/render_thread_impl.h"
+#include "ipc/ipc_platform_file.h"
+#include "ipc/message_filter.h"
+
+namespace base {
+class MessageLoopProxy;
+}
+
+namespace content {
+
+// MessageFilter that handles AEC dump messages and forwards them to an
+// observer.
+class CONTENT_EXPORT AecDumpMessageFilter : public IPC::MessageFilter {
+ public:
+  class AecDumpDelegate {
+   public:
+    virtual void OnAecDumpFile(
+        const IPC::PlatformFileForTransit& file_handle) = 0;
+    virtual void OnDisableAecDump() = 0;
+    virtual void OnIpcClosing() = 0;
+  };
+
+  AecDumpMessageFilter(
+      const scoped_refptr<base::MessageLoopProxy>& io_message_loop,
+      const scoped_refptr<base::MessageLoopProxy>& main_message_loop);
+
+  // Getter for the one AecDumpMessageFilter object.
+  static scoped_refptr<AecDumpMessageFilter> Get();
+
+  // Adds a delegate that receives the enable and disable notifications.
+  void AddDelegate(AecDumpMessageFilter::AecDumpDelegate* delegate);
+
+  // Removes a delegate.
+  void RemoveDelegate(AecDumpMessageFilter::AecDumpDelegate* delegate);
+
+  // IO message loop associated with this message filter.
+  scoped_refptr<base::MessageLoopProxy> io_message_loop() const {
+    return io_message_loop_;
+  }
+
+ protected:
+  virtual ~AecDumpMessageFilter();
+
+ private:
+  // Sends an IPC message using |sender_|.
+  void Send(IPC::Message* message);
+
+  // Registers a consumer of AEC dump in the browser process. This consumer will
+  // get a file handle when the AEC dump is enabled and a notification when it
+  // is disabled.
+  void RegisterAecDumpConsumer(int id);
+
+  // Unregisters a consumer of AEC dump in the browser process.
+  void UnregisterAecDumpConsumer(int id);
+
+  // IPC::MessageFilter override. Called on |io_message_loop|.
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+  virtual void OnFilterAdded(IPC::Sender* sender) OVERRIDE;
+  virtual void OnFilterRemoved() OVERRIDE;
+  virtual void OnChannelClosing() OVERRIDE;
+
+  // Accessed on |io_message_loop|.
+  void OnEnableAecDump(int id, IPC::PlatformFileForTransit file_handle);
+  void OnDisableAecDump();
+
+  // Accessed on |main_message_loop_|.
+  void DoEnableAecDump(int id, IPC::PlatformFileForTransit file_handle);
+  void DoDisableAecDump();
+  void DoChannelClosingOnDelegates();
+  int GetIdForDelegate(AecDumpMessageFilter::AecDumpDelegate* delegate);
+
+  // Accessed on |io_message_loop_|.
+  IPC::Sender* sender_;
+
+  // The delgates for this filter. Must only be accessed on
+  // |main_message_loop_|.
+  typedef std::map<int, AecDumpMessageFilter::AecDumpDelegate*> DelegateMap;
+  DelegateMap delegates_;
+
+  // Counter for generating unique IDs to delegates. Accessed on
+  // |main_message_loop_|.
+  int delegate_id_counter_;
+
+  // Message loop on which IPC calls are driven.
+  const scoped_refptr<base::MessageLoopProxy> io_message_loop_;
+
+  // Main message loop.
+  const scoped_refptr<base::MessageLoopProxy> main_message_loop_;
+
+  // The singleton instance for this filter.
+  static AecDumpMessageFilter* g_filter;
+
+  DISALLOW_COPY_AND_ASSIGN(AecDumpMessageFilter);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_MEDIA_AEC_DUMP_MESSAGE_FILTER_H_