Win10竟会损坏用户文件?教你解决这个Bug

Aimo 2021-06-03 00:15:05
Windows8软件资讯

  [PConline 资讯]如果你是一名音乐发烧友,那么应该知道Flac这种常见的无损音乐格式。Flac音乐文件支持metadata,用户可以编辑metadata,让音乐文件带有艺术家、所属专辑、音轨等等信息。通常来说,metadata和音频数据并不相关,修改metadata并不会影响音频本身。但是,近日微软官方公布了Win10中存在一个Bug,在Win10中用资源管理器修改Flac文件的metadata,竟会导致音频的损坏!

Win10

  根据Windows Latest的报道,微软最新发布的一份支持文件披露,如果在Win10的2004或者更高版本中,使用文件资源管理器修改Flac音乐文件的metadata,就会损耗Flac音频文件。这个Bug在Win10专业版、家庭版、企业版、工作站版乃至其他版本的Win10中均有出现。

  根据微软本月早些时候发布的支持文件,Win10的文件资源管理器导致了这个错误,它破坏了Flac文件头包含的ID3框架也就是metadata,而这个ID3框架负责存储音频的注释,例如音乐标题、艺术家、专辑、曲目编号等。在Win10上,Flac的处理程序忽视了ID3框架,该程序认为Flac文件在使用4字节的文件头,当Flac文件被Win10编辑的时候,ID3框架被覆盖了,导致没有了开始代码,导致了音乐播放器无法识别被修改后的文件。

  因此,在Win10中,如果你直接用文件资源管理器修改Flac音乐文件的标题、艺术家等metadata,会导致该文件无法播放。

  幸运的是,微软已经确定了Bug的根本原因,用户可以通过Windows Update升级KB5003214补丁进行修复。

  在KB5003214补丁中,微软确认了上文提到的错误已经被修复,修改了Flac的标题、艺术家等metadata后,Flac不会再变得无法播放。而对于已经损坏了的Flac文件,微软则发布了一个PowerShell脚本来进行修复,运行该脚本后Flac文件即可重新播放,不过已经从ID3框架中丢失了的metadata信息并不能恢复。

  下面是利用PowerShell脚本修复Flac文件的具体方法。

  1、开启记事本;

  2、复制以下字符,粘贴到记事本中:

  # Copyright 2021 Microsoft

  # This script will repair a FLAC file that has been corrupted by Media Foundation in reference to KB5003430.

  # Refer to KB5003430 for further information

  param(

  [parameter(Mandatory=$true,

  HelpMessage="The path to the FLAC file that has been corrupted by Media Foundation",

  ValueFromRemainingArguments=$true)]

  [ValidateScript({ -not [String]::IsNullOrEmpty($_) -and (Test-Path $_) })]

  [String]$File

  )

  # We need to back up the current file incase we have any errors

  $FileDirectory = Split-Path -Resolve $File

  $Filename = Split-Path -Leaf -Resolve $File

  $FullPath = Join-Path -Resolve $FileDirectory $Filename

  $Filename = [String]::Format("Backup_{0:yyyyMMdd_hhmmss}_{1}", [DateTime]::Now, $Filename)

  $BackupLocation = Join-Path $FileDirectory $Filename

  Write-Output "Microsoft FLAC Repair Tool. This tool will repair a FLAC audio file that was corrupted when editing its details."

  Write-Output "Affected File: $FullPath"

  Write-Output "A backup of the file will be made: $BackupLocation"

  Write-Output "Do you wish to continue?"

  $choice=$host.ui.PromptForChoice("Fixing FLAC Script", "Do you wish to continue", ('&Yes', '&No'), 1)

  function ParseStreamInfoMetadataBlock([System.IO.FileStream]$stream)

  {

  $blockType = $stream.ReadByte()

  $lastBlock = ($blockType -shr 7) -ne 0

  $blockType = $blockType -band 0x7F

  if ($blockType -ne 0)

  {

  return $false

  }

  $blockSize = (($stream.ReadByte() -shl 16) -bor ($stream.ReadByte() -shl 8) -bor $stream.ReadByte())

  if ($blockSize -lt 34)

  {

  return $false

  }

  $minAudioBlockSize = ($stream.ReadByte() -shl 8) -bor $stream.ReadByte()

  $maxAudioBlockSize = ($stream.ReadByte() -shl 8) -bor $stream.ReadByte()

  if ($minAudioBlockSize -lt 16 -or $maxAudioBlockSize -lt 16)

  {

  return $false

  }

  $minFrameSize = (($stream.ReadByte() -shl 16) -bor ($stream.ReadByte() -shl 8) -bor $stream.ReadByte())

  $maxFrameSize = (($stream.ReadByte() -shl 16) -bor ($stream.ReadByte() -shl 8) -bor $stream.ReadByte())

  $sampleInfo = (($stream.ReadByte() -shl 24) -bor ($stream.ReadByte() -shl 16) -bor ($stream.ReadByte() -shl 8) -bor $stream.ReadByte())

  $sampleRate = $sampleInfo -shr 12

  $channelCount = (($sampleInfo -shr 9) -band 0x7) + 1

  $bitsPerSample = (($sampleInfo -shr 4) -band 0x1F) + 1

  [UInt64]$sampleCount = (($stream.ReadByte() -shl 24) -bor ($stream.ReadByte() -shl 16) -bor ($stream.ReadByte() -shl 8) -bor $stream.ReadByte())

  $sampleCount = (([UInt64]$sampleInfo -band 0xF) -shl 32) -bor $sampleCount

  $MD5HashBytes = New-Object byte[] 16

  $stream.Read($MD5HashBytes, 0, $MD5HashBytes.Length)

  $MD5Hash = [Guid]($MD5HashBytes)

  if ($sampleRate -eq 0)

  {

  return $false

  }

  # Passing these checks means that we likely have a stream info header and can rebuild the file

  Write-Output "File Stream Information"

  Write-Output "Sample Rate: $sampleRate"

  Write-Output "Audio Channels: $channelCount"

  Write-Output "Sample Depth: $bitsPerSample"

  Write-Output "MD5 Audio Sample Hash: $MD5Hash"

  return $true

  }

  if ($choice -eq 0)

  {

  Copy-Item $FullPath -Destination $BackupLocation -Force

  $stream = [System.IO.File]::Open($FullPath, [System.IO.FileMode]::Open)

  $stream.Seek(4, [System.IO.SeekOrigin]::Begin)

  while ($stream.ReadByte() -eq 0) {}

  # We now need to figure out where a valid FLAC metadata frame begins

  # We are likely pointing to the last byte of the size member so we'll seek back 4 bytes and retry

  $flacDataStartPosition = $stream.Position - 4

  $stream.Seek($flacDataStartPosition, [System.IO.SeekOrigin]::Begin)

  while (-not(ParseStreamInfoMetadataBlock($stream)))

  {

  $flacDataStartPosition = $flacDataStartPosition + 1

  $stream.Seek($flacDataStartPosition, [System.IO.SeekOrigin]::Begin)

  }

  # Insert the start code

  $stream.Seek($flacDataStartPosition, [System.IO.SeekOrigin]::Begin)

  if (Test-Path "$FullPath.tmp")

  {

  Remove-Item "$FullPath.tmp"

  }

  $fixedStream = [System.IO.File]::Open("$FullPath.tmp", [System.IO.FileMode]::CreateNew)

  [byte[]]$startCode = [char[]]('f', 'L', 'a', 'C');

  $fixedStream.Write($startCode, 0, $startCode.Length)

  $stream.CopyTo($fixedStream)

  $stream.Close()

  $fixedStream.Close()

  Move-Item -Force "$FullPath.tmp" $FullPath

  }

  3、保存文件,在“另存为”对话框中,将目录定位到你想要保存PowerShell脚本的位置;

  4、在文件名输入框中,输入“FixFlacFiles.ps1”,将另存为文件的类型更改为Text Documents (*.txt);

  5、进入到你保存该PowerShell脚本的目录;

  6、右键点击刚刚保存的脚本,然后选择“使用PowerShell运行”;

  7、出现提示时,输入无法播放的Flac文件的文件名,然后按下回车键。

  微软建议大家安装本月推送的可选累积更新,以避免修改Flac文件metadata出现的问题。

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