ITunes, is a new digital media applications, by apple computer in 2001 on January 10th in San Francisco, used to launch the Expo Macworld digital music and broadcast and management with video files.
introduction
developers
apple
The latest stable release 9.1.0.79/2010 04 month 1
Type media program
The license agreement private (free software)
ITunes program is also an interface, management popular apple iPod digital media player on the content. In addition, connecting to iTunes Store can iTunes (if network connection exist), in order to buy the digital music, download music, TV shows, iPod video game, various Podcast as well as standard feature films.
It was originally by Jeff Robbin and Bill Kincaid development, as an MP3 program is called the SoundJam MP, and by Casady & Greene published in 1999. In 2000 was apple computer purchase, give a new user interface and capable of burn CDS, with its record function, and remove panel support, and published do iTunes. Mac OS 9 only at the beginning of the application, with version 2 issue of the nine months later Mac OS X support is joined with the issuance of Mac OS version 3 nine support is stopped. In October 2003, with the issuance of 4.1 iTunes, Apple to join together to Windows 2000 and Windows XP support. However, since Microsoft's latest operating system Windows Vista issued later, apple computer claims several known compatibility issue with iTunes software. Apple computer will soon release a new version to correct problem. At present, has been in operation on the win7 iTunes.
From the apple iTunes, the website free downloaded, also along with all the Macintosh computers and some iPod incidental and provide Mac OS X. It also provides as an apple computer iLife multimedia applications is part of the package.
history
SoundJam MP - from iTunes Macintosh software company Casady & Greene issued a popular commercial MP3 software -. Apple bought SoundJam MP copyright and employed created SoundJam three programmer. The first release iTunes, with SoundJam MP is very similar, increased CD burning function and a better user interface. Apple has already in subsequent iTunes version increased a lot of important function.
Apple computer has also developed in the mobile phone (e.g. the Motorola ROKR, Motorola RAZR with the Motorola SLVR) execution iTunes trademark software.
function
Users can put their Music composition playlists, edit file information, burn CDS, copy files to MP3 player of apple iPod, through its built-in Music Store purchase Music, download Podcast, backup songs to a CD or DVD, executive visualization and coding Music become many different audio formats.
playlist
"Intelligent playlist" can be set to automatically update playlist (on-line update), (like a database queue as) based on a customized list selection criteria. Different standards can control of various aspects of playlists.
Playlist can random or sequentially broadcast. "Random" random sequence algorithm can from album or an artist of different audio tracks choose different audio tracks for broadcast (iTunes 5.0 version of a new feature). Party random broadcast can also from grade higher repertoire for selecting tracks playback.
Party random playlist is used as a simple DJ assistant. By default, it randomly from library or other playlists in selecting music; Users can through the music to delete one covering its choses results (iTunes music to select new to replace them), but can be by drag-and-drop scripting or right-click menu add your own music to achieve the same effect. Which will make a play list contains both user primaries and randomly selected music. Party random playlist can in operation of extracted; This makes all randomly selected music in playlist play when be replaced.
Music database
ITunes store in two files on audio files metadata.
The first is called iTunes more emphases binary file (a previous version called iTunes x Music more emphases), it USES the oneself's proprietary atracurium format. It not only buffer similar artists and types of such stored in audio files ID3 marker space (such as the marker) information, also save some like "broadcast count" and "sampling rate" iTunes special information.
The second document called iTunes Music more emphases. XML, it in the information change was iTunes refresh. It is an XML format, allows developers to easy development as the Apple iDVD, iMovie and Freshly Squeezed iPhoto or Software 's crazy Star. [1] as can access it information Software.
This system occupies a soundtrack to prevent manufacturers of metadata any change, in addition to "play count", "last played" and "sampling rate" these are stored in proprietary in document metadata, all other information through XML files and become effective.
care
In order to make up for the inadequacy, physical CD can print customization of iTunes editions fold-out and songs/albums list. In from playlists in fire CD after completion, the user can choose this playlists and click on the file - print, open a print options dialog box. These users can select print single album cover page (purchased iTunes album) or a combination cover page (user self-established list). ITunes can automatically set a side, the other side includes images containing album orbit of the title of the template.
Internet radio station
The Kerbango incidental to 1.0 iTunes Internet radio service support, provide iTunes users a another available popular online radio streaming media choices. In 2001, Kerbango company launched a commercial, apple for its subsequent version 2.0 iTunes established its own online broadcasting service. Expires in July 2005, has been broadcasting service iTunes can support about 200 to 300 different "stations" (online, there are more than 400 supports multiple bitrate of streaming media), mostly MP3 flow format. Program covers many kinds of music and talks, including like Paradise, have DI. SomaFM FM, such as the main online Radio and to KKJZ, WFMU and WMVY as a representative of the ground stations. ITunes, also support can use Winamp play. PLS and m3u format files,. Used all of almost iTunes streaming format.
Apple now no longer upgrade Internet radio station, iTunes website also no news is brought up.
File format support
7 iTunes will now be able to read, write and conversion to MP3, WAV,, AIFF mpeg-4, AAC and Apple is between.
ITunes, also can play any QuickTime can play (and even some video format), including from iTunes Store and Audible. Com audio books of protected AAC files. In order to play other formats, such as containing Ogg Vorbis or Speex coding, iTunes, need to install Xiph QuickTime components. ITunes cannot correctly play HE - AAC/aacPlus audio stream. HE aacPlus format file - AAC/can play into 22 kHz AAC files (actually it did not exceed 11 kHz soprano boundary. HE - AAC streaming audio (some Internet channel used) have wholly unable to play.
Have some of apple MP3 encoder with variable bit rate for coding quality review. In January 2004, double anonymous six MP3 to 128 kbit/s coding encoder, Roberto Amorim led by public listening test, VBR MP3 iTunes ranked last. Coder This led to later how iTunes tested have serious problems of proven.
ITunes Windows can automatically convert unprotected WMA (including version 9) files to other audio formats, but it does not support directly played or compiled WMA format.
Sound processing
ITunes music sound use of computers play. ITunes also contains the audio processing function, called the equalizing, and sound enhancer).
Music sharing
ITunes music in the database songs can use Bonjour (called) and in Rendezvous before regional network share - this is the Apple Zeroconf (without setting, Zero Configuration Required) open web standard real done. This technology can make the same subnet section of the song can be Shared and automatic detection. When song is Shared, iTunes, will this song streaming into another one computer, but to prevent be copied and cannot be stored. Those who use copyright protection AAC songs, but also can be accessed by iTunes Music Store need obtained authorization. Every 24 hours of five biggest allow users to attachment.
Once in iTunes 4.0, users can through Internet free access to Shared music, except through the same son network outside, also can assigned those distal share music database's IP address. Apple computer quickly in 4.0.1 version removes the function, they declare it violated the user license agreement (EULA).
Music share using digital music access protocol (DAAP), this is the apple computer founded agreement specially for the share music purposes.
Video support
In May 2005 9, video support and iTunes 4.8 iTunes, roll out together. Users can directly from the computer to image clips him into iTunes database classified and management. Images respectively in the main window iTunes small box, separate window or full screen browse. In video support, iTunes function of imperfect: although in the database by television or display image is the small icon and music apart, but still with ordinary music files and put together by the same music category (such as "album" and "composer") classification. To some iTunes mainstream format incompatibility, including AVI and WMV.
In October 2005 12, apple iTunes music mall can launch in video content of purchase and watch at iTunes music j 6.0 iTunes mall launched after thousand choice music image and 5 sets of TV programs, including ABC 's "LOST files" and "desperate housewives, in broadcast 24 hours after instant can buy at the mall, still include some selected programs in the second quarter, Then select programs also includes the NBC Universal, USA, Sci Fi any - a shows and Viacom, stage also join some gentlemen - owned grow independently 'program. Mall also released some apple's selected movie trailers. Buy at the mall video format is 128 kbit/s Protected mpeg-4 h.264 video (1).
By January 2006 26 date, iTMS provide more than 40 TV program download, including the latest added Nickelodeon, "a Comedy Central and MTV SpongeBob SquarePants multiple series such as four base guest, southern China and Punk \ 'd. At present many Video Podcast need Video and Quicktime (7), and with the latest version of the old MacOS incompatible versions (only after v10.3.9 and will only be supported). Version
July 2006 4 date, music store offers more than iTunes 150 kinds TV programs for people to download; Including recently new join any more, "a Comedy Central," Discovery MTV and FOX programs.
Video from the store is available by encoded as 5.4 kbit/s Protected mpeg-4 h.264 Video (approximately). An kbit/s AAC numerous 128 track. Many films and Video Podcast need the latest edition of Quicktime Quicktime 7, in relatively early on ancient MacOS may not compatible (v10.3.9 and subsequent versions can only support).
Plug - ins
ITunes support visualization and equipment plugin. Visual effect plugin allows developers to build music drive visual effect (iTunes, including a default visual effect, the G Force [2] and permit from SoundSpectrum). Visual effect plugin SDK for the Mac and Windows can from apple website free downloads [3]. Equipment plugin to allow additional music broadcast equipment support, but apple will only authorized API to those who signed confidentiality agreement of bona fideOEM.
Podcast
On 28 June 2005 released 4.9 version of the iTunes increased built-in Podcasting support. Users can iTunes Music Store or through subscription podcasts're landing URL. After subscribed podcast will be automatically downloads. The user can select a weekly, daily, every hour or manual updating podcast. Apple to maintain the four "Official" podcast: Podfinder (Adam Curry), Real flop could Talk (hip hop artist interview -), New Music Apple iTunes Tuesday and have Call." Directory home page is also shown from commercial radio and independent glass-shells noticeable Podcast. To obtain about the material, see Podcasting external links.
Video Podcast
ITunes version 6 introduces to video podcast support, although video and RSS support have informal exists in 4.9 edition. Users can through iTunes Music Store and subscription RSS're're URL. Video podcast not only can contain downloadable Video files (MOV, MP4, M4V, MPG then larger) and can include flow even IPTV. The downloadable files can be transmitted to new iPod and downloadable files and flow can be in Front Row apple new media center program broadcast.
Synchronous iPod and other players
Whenever a iPod attached to it, iTunes automatically synchronized music and video of its libraries (OS X version of the iTunes can synchronize several different kinds of digital audio player [4]; Windows versions of iTunes only support iPod [5]). New repertoire and playlists by automatic replication to iPod, computer curved garage deleted repertoire of will be deleted in the iPod. IPod to the pieces of the comments will be feedback to iTunes music Treasury, audio books will remember the last time broadcast position.
Automatic synchronization can be closed, in order to manually reproduce separate pieces or complete playlist, However, iTunes music can only copy to iPod on but could not be reversed, which inspired third-party software support the music from the iPod copied out. Through some software, in the Unix command-line also can do the job.
When computer connected with the iPod not enough space for synchronizing the iTunes atracurium, it will create a be connected iPod namesake playlists. The playlist can be user change already filled available space.
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