media/base/media_file_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 MEDIA_BASE_MEDIA_FILE_CHECKER_H_
   6 #define MEDIA_BASE_MEDIA_FILE_CHECKER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/files/file.h"
  10 #include "media/base/media_export.h"
  11
  12 namespace base {
  13 class TimeDelta;
  14 }
  15
  16 namespace media {
  17
  18 // This class tries to determine if a file is a valid media file. The entire
  19 // file is not decoded so a positive result from this class does not make the
  20 // file safe to use in the browser process.
  21 class MEDIA_EXPORT MediaFileChecker {
  22  public:
  23   explicit MediaFileChecker(base::File file);
  24   ~MediaFileChecker();
  25
  26   // After opening |file|, up to |check_time| amount of wall-clock time is spent
  27   // decoding the file. The amount of audio/video data decoded will depend on
  28   // the bitrate of the file and the speed of the CPU.
  29   bool Start(base::TimeDelta check_time);
  30
  31  private:
  32   base::File file_;
  33
  34   DISALLOW_COPY_AND_ASSIGN(MediaFileChecker);
  35 };
  36
  37 }  // namespace media
  38
  39 #endif  // MEDIA_BASE_MEDIA_FILE_CHECKER_H_