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. SendMessage(hwndwinamp, WMCOMMAND,commandname,0);./ # define WINAMPOPTIONSEQ 40036 // toggles the EQ window # define WINAMPOPTIONSPLEDIT 40040 // toggles the playlist window # define WINAMPVOLUMEUP 40058 // turns the volume up a little # define WINAMPVOLUMEDOWN 40059 // turns the volume down a little # define WINAMPFFWD5S 40060. Interface Description; IUrlAccessor: For a specified URL, the IUrlAccessor interface provides access to the properties of the item that is exposed in the URL. It can also bind those properties to a protocol handler-specific filter (that is, a filter other than the one associated with the file name).

M3U (MP3 URL^[1][2] or Moving Picture Experts Group Audio Layer 3Uniform Resource Locator^[3] in full) is a computer file format for a multimedia playlist. One common use of the M3U file format is creating a single-entry playlist file pointing to a stream on the Internet. The created file provides easy access to that stream and is often used in downloads from a website, for emailing, and for listening to Internet radio.

Although originally designed for audio files, such as MP3, it is commonly used to point media players to audio and video sources, including online sources. M3U was originally developed by Fraunhofer for use with their Winplay3 software,^[4] but numerous media players and software applications now support the format.

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Careless handling of M3U playlists has been the cause of vulnerabilities in many music players such as VLC media player,^[5]iTunes,^[6]Winamp,^[7] and many others.^[8]

File format[edit]

There is no formal specification for the M3U format; it is a de facto standard.

An M3U file is a plain text file that specifies the locations of one or more media files. The file is saved with the 'm3u' filename extension if the text is encoded in the local system's default non-Unicode encoding (e.g., a Windows codepage), or with the 'm3u8' extension if the text is UTF-8 encoded.^[9]

Each entry carries one specification. The specification can be any one of the following:

• an absolute local pathname; e.g., C:My MusicHeavysets.mp3
• a local pathname relative to the M3U file location; e.g. Heavysets.mp3
• a URL

Extended M3U[edit]

The M3U file can also include comments, prefaced by the '#' character. In extended M3U, '#' also introduces extended M3U directives which are terminated by a colon ':' if they support parameters.

Apple used the extended M3U format as a base for their HTTP Live Streaming (HLS)^[12] which was documented in an Independent Submission Stream RFC in 2017 as RFC 8216.^[13] Therein, a master playlist references segment playlists which usually contain URLs for short parts of the media stream. Some tags only apply to the former type and some only to the latter type of playlist, but they all begin with #EXT-X-.

M3U8[edit]

The Unicode version of M3U is M3U8, which uses UTF-8-encoded characters. M3U8 files are the basis for the HTTP Live Streaming (HLS) format originally developed by Apple to stream video and radio to iOS devices, and which is now a popular format for adaptive streaming in general.

The 2015 proposal for the HLS playlist format uses UTF-8 exclusively and does not distinguish between the 'm3u' and 'm3u8' file name extensions.^[14]

Internet media types[edit]

The only Internet media type registered for M3U and M3U8 is application/vnd.apple.mpegurl, registered in 2009 and only referring to the playlist format as used in HLS applications.^[15][16]

The current proposal for the HLS playlist format acknowledges two media types which it treats as equivalent: application/vnd.apple.mpegurl and audio/mpegurl.^[14] Likewise, these are the two types recommended for HLS use by Microsoft.^[17]

For non-HLS applications, no media types were standardized or registered with the IANA, but a number of media types are nonetheless associated with the historical and ongoing use of the M3U and M3U8 formats for general playlists:

• application/mpegurl
• application/x-mpegurl
• audio/mpegurl
• audio/x-mpegurl^[1][2]

These types, plus application/vnd.apple.mpegurl and application/vnd.apple.mpegurl.audio, are supported for HLS applications by (for example) Microsoft's Windows 10^[17] and Internet Explorer 9,^[18] and LG's WebOS.^[19]

Examples[edit]

Example 1

This is an example of an extended M3U file on the Windows platform. Sample.mp3 and Example.ogg are the media files. 123 and 321 are the lengths in seconds.^[20] A length of -1 or 0 may be used when the media file is a streaming file, as there is no actual, predefined length value. The value after the length is the title to be shown, which is generally the same as the location of the file which is on the second line. On the Mac OS X and Linux platforms, Unix paths are used.

Example 2

This example shows how to create an m3u file linking to a specified directory (for example, a flash drive, or CD-ROM). The m3u file should contain only one string: the path to the directory. After starting, the media player will play all contents of the directory:

Example 3

Here is another example, using relative format. The M3U file is placed in the same directory as the music, and directories must be preserved when moving the playlist to another device if subdirectories are used. This method is more flexible, as it does not rely on the file path staying the same.

This is the same file as above, saved as sample.m3u in C:Documents and SettingsUserMy Music

This format in an M3U allows copying to another device for playback. All files and directories referred to must also be copied.

Example 4

Here is a mixed example:

Notes:

• Alternative and Classical are sub-directories of the directory that this playlist is stored in.
• 'Song' and 'New Song' are in sub-directories of the directory that this playlist is stored in.
• 'Stuff' is in the same directory that the playlist is stored in.
• 'Foo' is in the specified (Windows) volume and directory, which may or may not be the same directory the playlist is in.
• 'Bar' is in a different directory at the same level as the playlist directory. The double-dots reference the parent directory of the playlist directory, then into the sub-directory 'Other Music' to reach 'Bar'.
• 'Listen' is a Shoutcast stream.
• 'Mine' is an MP3 stored on a web server.

Example 5

References to other M3U playlists, for example, are generally not well-supported.

Example 6

The following is an example of a M3U playlist file for 'Jar of Flies' album by 'Alice in Chains' that was created by Mp3tag with the following custom option settings:^[21][22][23]

• playlist extended info format = '%artist% - %title%'
• playlist filename format = '%artist%_%album%_00_Playlist.m3u'
• tag to filename conversion format = '%artist%_%album%_$num(%track%,2)_%title%'

Software[edit]

Tag editors[edit]

The following tag editor software allows users to edit the ID3 tags in MP3 files, and has support for creating M3U files.

Linux

• EasyTAG, puddletag.

Windows

• Mp3tag, puddletag.

Media players[edit]

Multi-platform

Android

• Astro Player,^[24][25][26]Kodi, N7Player,^[27][28] Musicolet^[29]

Mac

Nintendo

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• New Nintendo 3DS (including XL and 2DS XL variants) with Internet Browser app
• Nintendo Switch with the YouTube (site-specific) app
• Wii U with the Internet Browser or YouTube app

Windows

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• foobar2000, JRiver Media Center, JuK, MediaMonkey, PotPlayer, Winamp, Windows Media Player, XMPlay^[30]

See also[edit]

Other playlist file formats

• ASX - Windows media
• PLS - SHOUTcast
• XSPF - Xiph.Org Foundation
• WPL - Windows Media Player

References[edit]

1. ^ ^abFraunhofer Gesellschaft, Fraunhofer Institut für Integrierte Schaltungen-A (1996-10-30). 'WinPlay3 - Windows real-time ISO/MPEG Audio Layer 3 Player'. Archived from the original on 1997-06-06. Retrieved 2018-01-21.
2. ^ ^abGruett, Matt. 'M3U FILES AND STREAMING'. LockerGnome. Archived from the original on 2001-04-26.
3. ^Nero. 'Nero MediaHome 4 - Manual'(PDF). Archived(PDF) from the original on 2015-09-05.
4. ^'WINAMP.COM | Winamp Documentation'. June 6, 2002. Archived from the original on 2002-06-06.
5. ^'VideoLAN-SA-0804 (CVE-2007-6683)'. 2008. Arbitrary file overwrite and other abuses through M3U parser and browsers plugins.
6. ^'CVE-2012-0677: Heap-based buffer overflow in Apple iTunes before 10.6.3 allows remote attackers to execute arbitrary commands'. cve.circl.lu.
7. ^'CVE-2000-0624: Buffer overflow in Winamp 2.64 and earlier allows remote attackers to execute arbitrary commands via a long #EXTINF: ext'. www.cvedetails.com.
8. ^'247 search results'. Packet Storm. Retrieved 2018-01-23.
9. ^'Nero 2015 Platinum - System Requirements'. MP3 URL + UTF-8 (M3U8)
10. ^ ^abc'Album List for Winamp'. albumlist.sourceforge.net.
11. ^ ^abcde'Data'. birdcagesoft. Retrieved 2019-10-21.
12. ^'About the Common Media Application Format with HTTP Live Streaming | Apple Developer Documentation'. developer.apple.com.
13. ^R. Pantos; W. May (August 2007). '4.3 Playlist Tags'. RFC 8216: HTTP Live Streaming. Request for Comments (RFC) Pages - Test. RFC Editor. ISSN2070-1721.
14. ^ ^abPantos, Roger; May, William. 'HTTP Live Streaming'. tools.ietf.org.
15. ^'Media Types'. www.iana.org.
16. ^'Data'. iana. Retrieved 2019-10-21.
17. ^ ^ab'Simplified Adaptive Video Streaming: Announcing support for HLS and DASH in Windows 10 – IEBlog'. blogs.msdn.microsoft.com.
18. ^'HTMLVideoElement'. MDN Web Docs.
19. ^'Archived copy'. Archived from the original on 2015-12-22. Retrieved 2015-12-12.CS1 maint: archived copy as title (link)
20. ^'DigiLinX Application Note - Creating Playlists to Work with the Streaming Music Manager'(PDF). 2007-10-05.
21. ^'Mp3tag Help - Configuration > Export'. help.mp3tag.de.
22. ^'Mp3tag Help - Configuration > Playlist'. help.mp3tag.de.
23. ^'Mp3tag Help - Scripting functions'. help.mp3tag.de.
24. ^'Loading...'astroplayer.com. Archived from the original on December 1, 2009.
25. ^'Astro Player (old) - Sidenis LLC'. Archived from the original on March 3, 2016.
26. ^'Astro Player - Sidenis LLC'. Archived from the original on March 3, 2016.
27. ^'n7player Music Player - Apps on Google Play'. play.google.com.
28. ^'n7player 1.0 - Apps on Google Play'. play.google.com.
29. ^'Musicolet Music Player [No ads] - Apps on Google Play'. play.google.com. Retrieved 2020-11-02.
30. ^Hindley, Nathan. 'XMPlay 3.8.2'. XMPlay. Un4seen Developments. Retrieved 11 July 2016.

External links[edit]

• 'Unofficial M3U and PLS file specification'. Forum. Tech Support Greatest Hits. WinAmp. 2008 [2001].
• Gonze, Lucas (2003). 'Survey of playlist formats'. Draft.
• May, W. (2017). Pantos, R. (ed.). 'HTTP Live Streaming specification'. Draft. IETF. Includes M3U and M3U8