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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.
ALAC has been measured to require around four times as much CPU power to decode than FLAC does, [5] with implications for battery life on limited-power devices. Still, the format has been recommended for older iPod devices based on claims of lower power usage. [6]
Lossless audio coding formats such as FLAC and Apple Lossless are sometimes available, though at the cost of larger files. Uncompressed audio formats, such as pulse-code modulation (PCM, or .wav), are also sometimes used. PCM was the standard format for Compact Disc Digital Audio (CDDA).
In a lossless compressed format, however, the music would occupy a smaller file than an uncompressed format and the silence would take up almost no space at all. Lossless compression formats include FLAC, WavPack, Monkey's Audio, ALAC (Apple Lossless). They provide a compression ratio of about 2:1 (i.e. their files take up half the space of PCM).
FLAC is natively supported on IOS 11, including all "iDevices", but only via the Files (Apple) app or iCloud Drive. iTunes does not support FLAC, with Apple only offering native support for their own similar ALAC lossless audio format. Third-party applications are available in the App Store which enable FLAC playback.
FLAC: Lossless: 2001-07 Open source Yes Yes No Yes Yes No No No No ALAC: Lossless: 2004-04 Open source Yes Yes Yes Yes Yes No No No No 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 ...
ALAC Apple Lossless Audio Codec is an audio codec developed by Apple Inc. for lossless data compression of digital music. Audio bit depth Bit depth or sample resolution is the number of bits of information recorded for each sample. Bit depth directly corresponds to the resolution of each sample in a set of digital audio data.
Linear pulse-code modulation (LPCM, generally only described as PCM) is the format for uncompressed audio in media files and it is also the standard for CD-DA; note that in computers, LPCM is usually stored in container formats such as WAV, AIFF, or AU, or as raw audio format, although not technically necessary.