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/scoped_platform_file_closer.h"
  10 #include "base/platform_file.h"
  11 #include "media/base/media_export.h"
  12
  13 namespace base {
  14 class TimeDelta;
  15 }
  16
  17 namespace media {
  18
  19 // This class tries to determine if a file is a valid media file. The entire
  20 // file is not decoded so a positive result from this class does not make the
  21 // file safe to use in the browser process.
  22 class MEDIA_EXPORT MediaFileChecker {
  23  public:
  24   explicit MediaFileChecker(const base::PlatformFile& file);
  25   ~MediaFileChecker();
  26
  27   // After opening |file|, up to |check_time| amount of wall-clock time is spent
  28   // decoding the file. The amount of audio/video data decoded will depend on
  29   // the bitrate of the file and the speed of the CPU.
  30   bool Start(base::TimeDelta check_time);
  31
  32  private:
  33   base::PlatformFile file_;
  34   base::ScopedPlatformFileCloser file_closer_;
  35
  36   DISALLOW_COPY_AND_ASSIGN(MediaFileChecker);
  37 };
  38
  39 }  // namespace media
  40
  41 #endif  // MEDIA_BASE_MEDIA_FILE_CHECKER_H_