clsMp3Info

Option Explicit
'' This fixes some bugs in MP3 Snatch and provides an method of "generating"
'' artist/title/album information based solely on the filename (for those files
'' without ID3 tags.)
'' John Lambert
'' [email protected]
'' http://home.cwru.edu/~jrl7/
'' Version 1.0
' Original Title: MP3 Snatch
' Author: Leigh Bowers
' WWW: http://www.esheep.freeserve.co.uk/compulsion/index.html
' Email: [email protected]
Private mvarFilename As String
Private Type Info
 sTitle As String
 sArtist As String
 sAlbum As String
 sComment As String
 sYear As String
 sGenre As String
End Type
Private MP3Info As Info
Public Property Get Filename() As String
 Filename = mvarFilename
End Property
Private Function IsValidFile(ByVal sFilename) As Boolean
 Dim bOk As Boolean
 ' make sure file exists
 bOk = CBool(Dir(sFilename, vbHidden) <> "")
 
 Dim aExtensions, ext
 aExtensions = Array(".mp3", ".mp2", ".mp1")
 Dim bOkayExtension As Boolean
 bOkayExtension = False
 If bOk Then
  For Each ext In aExtensions
   If InStr(1, sFilename, ext, vbTextCompare) > 0 Then
    bOkayExtension = True
   End If
  Next 'ext
 End If
 
 IsValidFile = bOk And bOkayExtension
End Function
Public Property Let Filename(ByVal sPassFilename As String)
 Dim iFreefile As Integer
 Dim lFilePos As Long
 Dim sData As String * 128
 
 Dim sGenre() As String
 ' Genre
 Const sGenreMatrix As String = "Blues|Classic Rock|Country|Dance|Disco|Funk|Grunge|" + _
 "Hip-Hop|Jazz|Metal|New Age|Oldies|Other|Pop|R&B|Rap|Reggae|Rock|Techno|" + _
 "Industrial|Alternative|Ska|Death Metal|Pranks|Soundtrack|Euro-Techno|" + _
 "Ambient|Trip Hop|Vocal|Jazz+Funk|Fusion|Trance|Classical|Instrumental|Acid|" + _
 "House|Game|Sound Clip|Gospel|Noise|Alt. Rock|Bass|Soul|Punk|Space|Meditative|" + _
 "Instrumental Pop|Instrumental Rock|Ethnic|Gothic|Darkwave|Techno-Industrial|Electronic|" + _
 "Pop-Folk|Eurodance|Dream|Southern Rock|Comedy|Cult|Gangsta Rap|Top 40|Christian Rap|" + _
 "Pop/Punk|Jungle|Native American|Cabaret|New Wave|Phychedelic|Rave|Showtunes|Trailer|" + _
 "Lo-Fi|Tribal|Acid Punk|Acid Jazz|Polka|Retro|Musical|Rock & Roll|Hard Rock|Folk|" + _
 "Folk/Rock|National Folk|Swing|Fast-Fusion|Bebob|Latin|Revival|Celtic|Blue Grass|" + _
 "Avantegarde|Gothic Rock|Progressive Rock|Psychedelic Rock|Symphonic Rock|Slow Rock|" + _
 "Big Band|Chorus|Easy Listening|Acoustic|Humour|Speech|Chanson|Opera|Chamber Music|" + _
 "Sonata|Symphony|Booty Bass|Primus|Porn Groove|Satire|Slow Jam|Club|Tango|Samba|Folklore|" + _
 "Ballad|power Ballad|Rhythmic Soul|Freestyle|Duet|Punk Rock|Drum Solo|A Capella|Euro-House|" + _
 "Dance Hall|Goa|Drum & Bass|Club-House|Hardcore|Terror|indie|Brit Pop|Negerpunk|Polsk Punk|" + _
 "Beat|Christian Gangsta Rap|Heavy Metal|Black Metal|Crossover|Comteporary Christian|" + _
 "Christian Rock|Merengue|Salsa|Trash Metal|Anime|JPop|Synth Pop"
 ' Build the Genre array (VB6+ only)
 sGenre = Split(sGenreMatrix, "|")
 ' Store the filename (for "Get Filename" property)
 mvarFilename = sPassFilename
 ' Clear the info variables
 
 If Not IsValidFile(sPassFilename) Then ' bug fix
  Exit Property
 End If
 
 MP3Info.sTitle = ""
 MP3Info.sArtist = ""
 MP3Info.sAlbum = ""
 MP3Info.sYear = ""
 MP3Info.sComment = ""
 ' Ensure the MP3 file exists
 ' Retrieve the info data from the MP3
 iFreefile = FreeFile
 lFilePos = FileLen(mvarFilename) - 127
 If lFilePos > 0 Then      ' bug fix
  Open mvarFilename For Binary As #iFreefile
  Get #iFreefile, lFilePos, sData
  Close #iFreefile
 End If
 
 ' Populate the info variables
 If Left(sData, 3) = "TAG" Then
  MP3Info.sTitle = Mid(sData, 4, 30)
  MP3Info.sArtist = Mid(sData, 34, 30)
  MP3Info.sAlbum = Mid(sData, 64, 30)
  MP3Info.sYear = Mid(sData, 94, 4)
  MP3Info.sComment = Mid(sData, 98, 30)
  Dim lGenre
  lGenre = Asc(Mid(sData, 128, 1))
  If lGenre <= UBound(sGenre) Then
   MP3Info.sGenre = sGenre(lGenre)
  Else
   MP3Info.sGenre = ""
  End If
 Else
  
  MP3Info = GetInfo(mvarFilename)
 End If
End Property
'' Try to get something meaningful out of the filename
Private Function GetInfo(ByVal sFilename) As Info
 Dim i As Info
 GetInfo = i
 Dim s
 s = sFilename
 If InStrRev(s, "\") > 0 Then 'it's a full path
  s = Mid(s, InStrRev(s, "\") + 1)
 End If
 
 'drop extension
 s = Left(s, InStrRev(s, ".", , vbTextCompare) - 1)
 s = Replace(Trim(s), " ", " ")
 s = Trim(s)
 
 If CountItems(s, " ") < 1 Then
  i.sTitle = Replace(s, "_", " ")
  GetInfo = i
  Exit Function
 End If
 
 s = Trim(Replace(s, "_", " "))
  
 If Left(s, 1) = "(" And CountItems(s, "-") < 3 Then
  i.sArtist = Mid(s, 2, InStr(s, ")") - 2)
  s = Trim(Mid(s, InStr(s, ")") + 1))
  If Left(s, 1) = "-" Then 'grab title
   i.sTitle = Trim(Mid(s, 2))
  Else 'grab title anyway
   If InStr(s, "-") > 0 Then
    i.sAlbum = Mid(s, InStr(s, "-") + 1)
    i.sTitle = Left(s, InStr(s, "-") - 1)
   Else
    i.sTitle = Trim(s)
   End If
  End If
 Else
  Dim aThings
  Dim l
  aThings = Split(s, "- ")
  For l = 0 To UBound(aThings)
   If Not IsNumeric(aThings(l)) Then
    If i.sArtist = "" Then
     i.sArtist = aThings(l)
    Else
     If IsNumeric(aThings(l - 1)) Then ' title
      If i.sTitle = "" Then
       i.sTitle = aThings(l)
      End If
     ElseIf i.sAlbum = "" Then
      i.sAlbum = aThings(l)
     End If
    End If
   End If
  Next ' i
 
 End If
 
 i.sArtist = Replace(Replace(i.sArtist, "(", ""), ")", "")
     
 If Left(s, 1) <> "(" And i.sTitle = "" And (InStr(sFilename, "\") <> InStrRev(sFilename, "\")) Then
  ' recurse
  GetInfo = GetInfo(FixDir(sFilename))
 Else
  GetInfo = i
 End If
End Function
Private Function CountItems(s, sToCount)
 Dim a
 a = Split(s, sToCount)
 If UBound(a) = -1 Then
  CountItems = 0
 Else
  CountItems = UBound(a) - LBound(a)
 End If
End Function
Private Function FixDir(sFullpath)
 Dim s1, s2
 s1 = Trim(Left(sFullpath, InStrRev(sFullpath, "\") - 1))
 s2 = Trim(Mid(sFullpath, InStrRev(sFullpath, "\") + 1))
 FixDir = s1 & " - " & s2
End Function
Public Property Get Title() As String
 Title = Trim(MP3Info.sTitle)
End Property
Public Property Get Artist() As String
 Artist = Trim(MP3Info.sArtist)
End Property
Public Property Get Genre() As String
 Genre = Trim(MP3Info.sGenre)
End Property
Public Property Get Album() As String
 Album = Trim(MP3Info.sAlbum)
End Property
Public Property Get Year() As String
 Year = Trim(MP3Info.sYear)
End Property
Public Property Get Comment() As String
 Comment = Trim(MP3Info.sComment)
End Property