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The Apple Lossless Audio Codec (ALAC, / ə ˈ l æ k /), also known as Apple Lossless, or Apple Lossless Encoder (ALE), is an audio coding format, and its reference audio codec implementation, developed by Apple for lossless data compression of digital music.
The 'Music' category is merely a guideline on commercialized uses of a particular format, not a technical assessment of its capabilities. For example, MP3 and AAC dominate the personal audio market in terms of market share, though many other formats are comparably well suited to fill this role from a purely technical standpoint.
TTA – Lossless compression; WavPack – Hybrid lossy/lossless; Bonk – Hybrid lossy/lossless; supported by fre:ac (formerly BonkEnc) Apple Lossless – Lossless compression (MP4) Fraunhofer FDK AAC – Lossy compression (AAC) FFmpeg codecs in the libavcodec library, e.g. AC-3, AAC, ADPCM, PCM, Apple Lossless, FLAC, WMA, Vorbis, MP2, etc.
A file format for the Free Lossless Audio Codec, an open-source lossless compression codec. .gsm: Designed for telephony use in Europe, GSM is used to store telephone voice messages and conversations. With a bitrate of 13 kbit/s, GSM files can compress and encode audio at telephone quality. [7] Note that WAV files can also be encoded with the ...
A lossless audio coding format reduces the total data needed to represent a sound but can be de-coded to its original, uncompressed form. A lossy audio coding format additionally reduces the bit resolution of the sound on top of compression, which results in far less data at the cost of irretrievably lost information.
Audio-only MPEG-4 files generally have a .m4a extension. This is especially true of unprotected content. MPEG-4 files with audio streams encrypted by FairPlay digital rights management as were sold through the iTunes Store use the .m4p extension. iTunes Plus tracks, that the iTunes Store currently sells, are unencrypted and use .m4a accordingly.
WMA Lossless: Lossless: 2003-01 Proprietary [97] ACM [d] No No Yes Yes No No No No DTS-HD: Lossless: 2011-08 Proprietary: Yes Yes [45] Yes No No No No No No Dolby TrueHD: Lossless: 2006-04 Proprietary: Mature [ζ] Yes No No No No No No No MLP: Lossless: 1999-03 Proprietary: No Yes [45] No No No No Private No No ALS: Lossless: 2006-03 Patent ...
FLAC, M4A, MP3, OGG, WMA AIFF, ALAC, WAV None Maximum file size: No Limit No Limit 300 MB 200 MB or 2 hours [16] 250 MB [17] Free Bitrate: Original Quality Original Quality 256 kbit/s [13] 128 kbit/s [18] None None Premium Bitrate: Original Quality Original Quality 256 kbit/s 320 kbit/s or Original [19] 256 kbit/s Original Quality Free Storage: [a]