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Re: how to get media data for M4A songs I.E. songs purchased from iTunes
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Re: how to get media data for M4A songs I.E. songs purchased from iTunes

  • Subject: Re: how to get media data for M4A songs I.E. songs purchased from iTunes
  • From: Chris Adamson <email@hidden>
  • Date: Wed, 18 Apr 2012 21:24:58 -0400
You might want to use the iTunes metadata APIs in AV Foundation instead.

For a file using MP4 container (.m4v, .m4a, .aac, etc.), it wouldn't be too hard to parse the file format by hand and find the user info atom. I did this like 10 years ago with QuickTime files and Java (yes, really), and the only major difference is that MP4 uses C-style nil-terminated strings, whereas QT uses Pascal strings (one byte of length followed by that many characters). Once you get the hang of the tree-of-atoms structure, it's kind of fun.

-Chris

Sent from my iPad

On Apr 18, 2012, at 9:03 PM, Andy Davidson <email@hidden> wrote:


AudioFileGetPropertyInfo (audioFile, kAudioFilePropertyInfoDictionary, &dictionarySize, 0);


Seems to work well with songs in mp3 format.


Any idea how I can get access to the meta information for songs purchased from itunes? The only key returned by my test program was duration.


dictionary: {

    "approximate duration in seconds" = "237.2";

}



I am hoping I can find some sort of iTunes id? I want to make it easy for my users to share their play lists. If someone is missing a song. I want them to be able to purchase it from itunes.

Thanks in advance

Andy
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 >how to get media data for M4A songs I.E. songs purchased from iTunes (From: Andy Davidson <email@hidden>)

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