More Tooling with PowerShell
In the last article, I started sharing my experiences in build a set of PowerShell tools to help my manage my MuseScore scores. I was able to extract score properties from a compressed XML file. The next step is to extract information from the associated MP3 file. I also know I will want to update the MP3 file with extracted score information. But let's not get ahead of ourselves.
TagLibSharp
A few years ago, I wrote published a newsletter issue on setting extended properties of MP3 and image files with an open source package, TagLib. I have saved the DLL to my scripts directory so that I can easily import it into PowerShell.
Add-Type -Path C:\scripts\TagLibSharp.dll
I'll continue with the MuseScore project from last time and specify the path to the MP3 file.
$mp3Path = "$Home\Documents\MuseScore4\Scores\nocturne-chamber-orchestra\Hypnos Suite.mp3"
I can now create a TagLib.File object and extract the properties I need.
$file = [TagLib.file]::Create($(Convert-Path $mp3Path))
Notice that I converted the path to a true FileSystem path. I often find when working with third-party libraries to convert paths. I can't assume the library will understand PSDrive references. Converting the path eliminates any ambiguity.
PS C:\> $file
Tag : TagLib.NonContainer.Tag
Properties : TagLib.Properties
TagTypesOnDisk : None
TagTypes : Id3v1, Id3v2
Name : C:\Users\Jeff\Documents\MuseScore4\Scores\nocturne-chamber-orchestra\Hypnos
Suite.mp3
MimeType : taglib/mp3
Tell : 0
Length : 0
InvariantStartPosition : 0
InvariantEndPosition : 12139205
Mode : Closed
FileAbstraction : TagLib.File+LocalFileAbstraction
Writeable : True
PossiblyCorrupt : False
CorruptionReasons :
It looks like there are nested properties.
PS C:\> $file.Properties
Codecs : {TagLib.Mpeg.AudioHeader}
Duration : 00:12:38.7054375
MediaTypes : Audio
Description : MPEG Version 1 Audio, Layer 3
AudioBitrate : 128
AudioSampleRate : 44100
BitsPerSample : 0
AudioChannels : 2
VideoWidth : 0
VideoHeight : 0
PhotoWidth : 0
PhotoHeight : 0
PhotoQuality : 0
Here's the information I need to extract.
PS C:\> $file.Properties.Duration
Days : 0
Hours : 0
Minutes : 12
Seconds : 38
Milliseconds : 705
Ticks : 7587054375
TotalDays : 0.00878131293402778
TotalHours : 0.210751510416667
TotalMinutes : 12.645090625
TotalSeconds : 758.7054375
TotalMilliseconds : 758705.4375
And it is already formatted as a TimeSpan object! In the last article, I was creating a custom object for the score. Now, I can add the length.
[PSCustomObject]@{
Title = $title
SubTitle = $subTitle
Composer = $composer
Duration = $file.Properties.Duration
CoverArt = $CoverArt
Copyright = $copyright
Online = $online
Path = $Path
}
> We'll come back to the Tag property later.
Get-ScoreProperty
This should be the last piece I need to build a PowerShell function. The function will extract information from the compressed XML file, find the cover image, and use the TagLib library to extract the MP3 properties.