iTunes is a media player, media library, and mobile device management application developed by Apple Inc. It is used to play, download, and organize digital audio and video on personal computers running the OS X andMicrosoft Windows operating systems. The iTunes Store is also available on the iPod Touch, iPhone, iPad and PC .
Through the iTunes Store, users can purchase and download music, music videos, television shows,audiobooks, podcasts, movies, and movie rentals in some countries, and ringtones, available on the iPhone and iPod Touch (fourth generation onward). Application software for the iPhone, iPad and iPod Touch can be downloaded from the App Store.
iTunes 11 is the most recent version of iTunes, available for OS X v10.6.8 or later, as well as Windows XP or later. It was released on November 29, 2012, one month later than expected, because of a delay by Apple, which explained that it needed extra time to complete the revisions necessary to complete the update.[4]
Music[edit]
iTunes keeps track of songs by creating a virtual library, allowing users to access and edit a song's attributes. These attributes, known as metadata, are stored in two separate library files. The first is a binary file called iTunes Library and it uses a proprietary file format ("ITL"). It caches information like artist and genre from the audio format's tag capabilities (the ID3 tag, for example) and stores iTunes-specific information like play count and rating. iTunes typically reads library data only from this file.[29] The second file, iTunes Music Library.xml, is refreshed whenever information in iTunes is changed. It uses an XML format, allowing developers to easily write applications that can access the library information (including play count, last played date, and rating, which are not standard fields in the ID3v2.3 format). Apple's own iDVD, iMovie, and iPhoto applications all access the library.[30] If the first file exists but is corrupted, such as by making it zero-length, iTunes will attempt to reconstruct it from the XML file. Detailed third-party instructions regarding this are documented elsewhere.[31] Beginning with iTunes 10.5.3 this behavior has been changed such that the XML file is not read automatically to recreate the database when the database is corrupted. Rather, the user should load the iTunes Library.xml file via File > Library > Import Playlist....
It has also been noted that iTunes does not automatically track changes to actual files in the library. If a file is moved or deleted, iTunes will display an exclamation mark beside the library entry and the user will need to manually amend the library record. Several third party tools address this problem.[32]
iTunes supports ripping from CDs, but not from DVDs. However, in 2008, Apple and select film studios introduced "iTunes Digital Copy", a bonus feature on some DVDs that provides a copy-protected and iTunes-compatible file for select films.[33]
File format support[edit]
iTunes 11 can currently read, write and convert between MP3, AIFF, WAV, MPEG-4, AAC and Apple Lossless (.m4a).[34]
iTunes can also play any audio files that QuickTime can play (as well as some video formats), including Protected AAC files from the iTunes Store and Audible.comaudio books. There is limited support for Vorbis and FLAC enclosed in an Ogg container (files using the Ogg container format are not natively supported) or Speexcodecs with the Xiph QuickTime Components, but requires iTunes to run in 32-bit mode (no longer an option after iTunes 11.1.2 released with OS X Mavericks). Because tag editing and album art is done within iTunes and not QuickTime, these features will not work with these QuickTime components. As of Snow Leopard, iTunes 9 (Mac) will play HE-AAC / AAC+ internet streams. The latest version of iTunes (Win/Mac) supports importing audio CDs with the default iTunes standard file format of AAC at 256 kbit/s, but users can choose from 16 kbit/s to 320 kbit/s constant bit rates (CBR) in either AAC or MP3.[citation needed] Importing of audio CDs into MP3 or AAC formats can also be accomplished using variable bitrate (VBR) encoding.
The Windows version of iTunes can automatically transcode DRM-free WMA (including version 9) files to other audio formats, but does not support playback of WMA files and will not transcode DRM protected WMA files. Telestream, Inc. provides free codecs for Mac users of QuickTime to enable playback of unprotected Windows Media files. These codecs are recommended by Microsoft.[35]
In addition to importing CDs into the iTunes library, users can also import digital audio files from other sources, an any format that iTunes supports. This can be accomplished by either right clicking on the file, selecting open with, and then selecting iTunes or dragging the file into the open iTunes window. Alternatively, for Amazon.com mp3s, the Amazon MP3 Downloader application will automatically import the mp3 files into the iTunes library.[36]
Windows[edit]
- Hardware:
- A PC with a 1 GHz Intel or AMD processor
- Intel Pentium D or faster processor is required to play Standard Definition video from the iTunes Store
- 2.0 GHz Intel Core 2 Duo or faster processor is required to play HD video, an iTunes LP, or iTunes Extras from the iTunes Store
- 512 MB of RAM; 1 GB is required to play HD video, an iTunes LP, or iTunes Extras
- Screen resolution of 1024×768 or greater; 1280×800 or greater is required to play an iTunes LP or iTunes Extras
- DirectX 9.0-compatible video card with 32 MB of video RAM; 64 MB recommended
- Broadband Internet connection to use the iTunes Store
- iTunes-compatible CD or DVD recorder to create audio CDs, MP3 CDs, or back-up CDs or DVDs
- Software:
- 32-bit editions of Windows XP Service Pack 2 or later, Windows Vista, Windows 7, or Windows 8
- 64-bit editions of Windows Vista, Windows 7, or Windows 8 require the iTunes 64-bit installer
- iTunes can also be installed on Windows XP Professional x64 Edition with a simple patch to the .msi files (although it is not officially supported by Apple)[108]
- 400 MB of available disk space
- Screen reader support requires Window-Eyes 7.1.1 or later
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