Class: AudioInfo

Inherits:
Object
  • Object
show all
Defined in:
lib/audioinfo.rb

Defined Under Namespace

Classes: Album

Constant Summary collapse

MUSICBRAINZ_FIELDS = 
{ 
  "trmid" 	=> "TRM Id",
  "artistid" 	=> "Artist Id",
  "albumid" 	=> "Album Id",
  "albumtype"	=> "Album Type", 
  "albumstatus" => "Album Status",
  "albumartistid" => "Album Artist Id",
  "sortname" => "Sort Name",
  "trackid" => "Track Id"
}
SUPPORTED_EXTENSIONS = 
%w{mp3 ogg mpc wma mp4 aac m4a flac}
VERSION = 
"0.1.7"

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(filename, encoding = 'utf-8') ⇒ AudioInfo

open the file with path fn and convert all tags from/to specified encoding

Raises:



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# File 'lib/audioinfo.rb', line 53

def initialize(filename, encoding = 'utf-8')
  raise(AudioInfoError, "path is nil") if filename.nil?
  @path = filename
  ext = File.extname(@path)
  raise(AudioInfoError, "cannot find extension") if ext.empty?
  @extension = ext[1..-1].downcase
  @musicbrainz_infos = {}
  @encoding = encoding

  begin
    case @extension
	when 'mp3'
 @info = Mp3Info.new(filename, :encoding => @encoding)
 default_tag_fill
 #"TXXX"=>
 #["MusicBrainz TRM Id\000",
 #"MusicBrainz Artist Id\000aba64937-3334-4c65-90a1-4e6b9d4d7ada",
 #"MusicBrainz Album Id\000e1a223c1-cbc2-427f-a192-5d22fefd7c4c",
 #"MusicBrainz Album Type\000album",
 #"MusicBrainz Album Status\000official",
 #"MusicBrainz Album Artist Id\000"]
        
 if (arr = @info.tag2["TXXX"]).is_a?(Array)
   fields = MUSICBRAINZ_FIELDS.invert
   arr.each do |val|
     if val =~ /^MusicBrainz (.+)\000(.*)$/
short_name = fields[$1]
       @musicbrainz_infos[short_name] = $2
     end
   end
 end
        @bitrate = @info.bitrate
 i = @info.tag.tracknum
 @tracknum = (i.is_a?(Array) ? i.last : i).to_i
 @length = @info.length.to_i
 @date = @info.tag["date"]
 @vbr = @info.vbr
 @info.close

	when 'ogg'
 @info = OggInfo.new(filename, @encoding)
 default_fill_musicbrainz_fields
 default_tag_fill
        @bitrate = @info.bitrate/1000
        @tracknum = @info.tag.tracknumber.to_i
 @length = @info.length.to_i
 @date = @info.tag["date"]
 @vbr = true
 @info.close
 
	when 'mpc'
        fill_ape_tag(filename)

 mpc_info = MpcInfo.new(filename)
        @bitrate = mpc_info.infos['bitrate']/1000
 @length = mpc_info.infos['length']

      when 'ape'
 fill_ape_tag(filename)

      when 'wma'
 @info = WmaInfo.new(filename, :encoding => @encoding)
 @artist = @info.tags["Author"]
 @album = @info.tags["AlbumTitle"]
 @title = @info.tags["Title"]
 @tracknum = @info.tags["TrackNumber"].to_i
 @date = @info.tags["Year"]
 @bitrate = @info.info["bitrate"]
 @length = @info.info["playtime_seconds"]
 MUSICBRAINZ_FIELDS.each do |key, original_key|
   @musicbrainz_infos[key] = 
            @info.info["MusicBrainz/" + original_key.tr(" ", "")] ||
            @info.info["MusicBrainz/" + original_key]
 end
        
	when 'aac', 'mp4', 'm4a'
 @info = MP4Info.open(filename)
 @artist = @info.ART
 @album = @info.ALB
 @title = @info.NAM
 @tracknum = ( t = @info.TRKN ) ? t.first : 0
 @date = @info.DAY
 @bitrate = @info.BITRATE
 @length = @info.SECS
 mapping = MUSICBRAINZ_FIELDS.invert

 faad_info(filename).match(/^MusicBrainz (.+)$/) do
   name, value = $1.split(/: /, 2)
   key = mapping[name]
   @musicbrainz_infos[key] = value
 end
	
	when 'flac'
 @info = FlacInfo.new(filename)
        tags = convert_tags_encoding(@info.tags, "UTF-8")
 @artist = tags["ARTIST"] || tags["artist"]
 @album = tags["ALBUM"] || tags["album"]
 @title = tags["TITLE"] || tags["title"]
 @tracknum = (tags["TRACKNUMBER"]||tags["tracknumber"]).to_i
 @date = tags["DATE"]||tags["date"]
 @length = @info.streaminfo["total_samples"] / @info.streaminfo["samplerate"].to_f
 @bitrate = File.size(filename).to_f*8/@length/1024
        tags.each do |tagname, tagvalue|
          next unless tagname =~ /^musicbrainz_(.+)$/
          @musicbrainz_infos[$1] = tags[tagname]
        end
        @musicbrainz_infos["trmid"] = tags["musicip_puid"]
 #default_fill_musicbrainz_fields

	else
 raise(AudioInfoError, "unsupported extension '.#{@extension}'")
    end

    if @tracknum == 0
      @tracknum = nil
    end

    @musicbrainz_infos.delete_if { |k, v| v.nil? }
    @hash = { "artist" => @artist,
	"album"  => @album,
	"title"  => @title,
	"tracknum" => @tracknum,
	"date" => @date,
	"length" => @length,
	"bitrate" => @bitrate,
    }

  rescue Exception, Mp3InfoError, OggInfoError, ApeTagError => e
    raise AudioInfoError, e.to_s, e.backtrace
  end

  @needs_commit = false

end

Instance Attribute Details

#album ⇒ Object

Returns the value of attribute album.



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# File 'lib/audioinfo.rb', line 34

def album
  @album
end

#artist ⇒ Object

Returns the value of attribute artist.



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# File 'lib/audioinfo.rb', line 34

def artist
  @artist
end

#bitrate ⇒ Object (readonly)

Returns the value of attribute bitrate.



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# File 'lib/audioinfo.rb', line 33

def bitrate
  @bitrate
end

#date ⇒ Object (readonly)

Returns the value of attribute date.



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# File 'lib/audioinfo.rb', line 34

def date
  @date
end

#extension ⇒ Object (readonly)

Returns the value of attribute extension.



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# File 'lib/audioinfo.rb', line 33

def extension
  @extension
end

#length ⇒ Object (readonly)

Returns the value of attribute length.



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# File 'lib/audioinfo.rb', line 34

def length
  @length
end

#musicbrainz_infos ⇒ Object (readonly)

Returns the value of attribute musicbrainz_infos.



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# File 'lib/audioinfo.rb', line 33

def musicbrainz_infos
  @musicbrainz_infos
end

#path ⇒ Object (readonly)

Returns the value of attribute path.



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# File 'lib/audioinfo.rb', line 33

def path
  @path
end

#title ⇒ Object

Returns the value of attribute title.



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# File 'lib/audioinfo.rb', line 34

def title
  @title
end

#tracknum ⇒ Object

Returns the value of attribute tracknum.



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# File 'lib/audioinfo.rb', line 33

def tracknum
  @tracknum
end

#vbr ⇒ Object (readonly)

Returns the value of attribute vbr.



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# File 'lib/audioinfo.rb', line 33

def vbr
  @vbr
end

Class Method Details

.open(*args) ⇒ Object

“block version” of #new()



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# File 'lib/audioinfo.rb', line 37

def self.open(*args)
  audio_info = self.new(*args)
  ret = nil
  if block_given?
    begin
      ret = yield(audio_info)
    ensure
      audio_info.close
    end
  else
    ret = audio_info
  end
  ret
end

Instance Method Details

#[](key) ⇒ Object

hash-like access to tag



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# File 'lib/audioinfo.rb', line 222

def [](key)
  @hash[key]
end

#close ⇒ Object

close the file and commits changes to disk



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# File 'lib/audioinfo.rb', line 232

def close
  if @needs_commit
    case @info
      when Mp3Info
 Mp3Info.open(@path, :encoding => @encoding) do |info|
   info.tag.artist = @artist
   info.tag.title = @title
   info.tag.album = @album
   info.tag.tracknum = @tracknum
 end
	when OggInfo
 OggInfo.open(@path, @encoding) do |ogg|
          { "artist" => @artist,
     "album"  => @album,
     "title"  => @title,
            "tracknumber" => @tracknum}.each do |k,v|
     ogg.tag[k] = v.to_s
   end
 end

	else
 raise(AudioInfoError, "implement me")
    end
    
  end
  @needs_commit
end

#mb_tagged? ⇒ Boolean

check if the file is correctly tagged by MusicBrainz

Returns:

  • (Boolean) 


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# File 'lib/audioinfo.rb', line 277

def mb_tagged?
  ! @musicbrainz_infos.empty?
end

#to_h ⇒ Object

convert tags to hash



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# File 'lib/audioinfo.rb', line 227

def to_h
  @hash
end