chrome/browser/media_galleries/fileapi/safe_audio_video_checker.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_AUDIO_VIDEO_CHECKER_H_
   6 #define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_AUDIO_VIDEO_CHECKER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/callback_forward.h"
  10 #include "base/files/file.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "content/public/browser/utility_process_host_client.h"
  13 #include "storage/browser/fileapi/copy_or_move_file_validator.h"
  14
  15 namespace content {
  16 class UtilityProcessHost;
  17 }
  18
  19 // Uses a utility process to validate a media file.  If the callback returns
  20 // File::FILE_OK, then the file appears to be a valid media file. This does
  21 // not attempt to decode the entire file, which may take a considerable amount
  22 // of time.  This class may be constructed on any thread, but should run on the
  23 // IO thread.
  24 class SafeAudioVideoChecker : public content::UtilityProcessHostClient {
  25  public:
  26   // Takes responsibility for closing |file|.
  27   SafeAudioVideoChecker(
  28       base::File file,
  29       const storage::CopyOrMoveFileValidator::ResultCallback& callback);
  30
  31   // Must be called on the IO thread.
  32   void Start();
  33
  34  private:
  35   enum State {
  36     INITIAL_STATE,
  37     PINGED_STATE,
  38     STARTED_STATE,
  39     FINISHED_STATE
  40   };
  41
  42   ~SafeAudioVideoChecker() override;
  43
  44   // Starts validation once the utility process has been started.
  45   virtual void OnProcessStarted();
  46
  47   // Notification of the result from the utility process.
  48   void OnCheckingFinished(bool valid);
  49
  50   // UtilityProcessHostClient implementation.
  51   void OnProcessCrashed(int exit_code) override;
  52   bool OnMessageReceived(const IPC::Message& message) override;
  53
  54   State state_;
  55
  56   base::File file_;
  57
  58   const storage::CopyOrMoveFileValidator::ResultCallback callback_;
  59
  60   base::WeakPtr<content::UtilityProcessHost> utility_process_host_;
  61
  62   DISALLOW_COPY_AND_ASSIGN(SafeAudioVideoChecker);
  63 };
  64
  65 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_AUDIO_VIDEO_CHECKER_H_