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The data compression software for encoding into ALAC files, Apple Lossless Encoder, was introduced into the Mac OS X Core Audio framework on April 28, 2004, together with the QuickTime 6.5.1 update, thus making it available in iTunes since version 4.5 and above, and its replacement, the Music application. [8]
Apple's iPhone supports AAC and FairPlay protected AAC files formerly used as the default encoding format in the iTunes Store until the removal of DRM restrictions in March 2009. Android 2.3 [ 67 ] and later supports AAC-LC, HE-AAC and HE-AAC v2 in MP4 or M4A containers along with several other audio formats.
Encoder Player AAC: ISO/IEC MPEG Audio Committee: 1997 ISO/IEC 14496-3 Non-free [1] Nero Digital Audio, Apple CoreAudio (via QuickTime, iTunes or afconvert [2]) FAAC (encoding only), FAAD2 (decoding only), FFmpeg, Audiocogs [3] (decoding only), Fraunhofer FDK AAC: Digital TV service, Digital Radio, Internet streaming Yes AAC-LD/AAC-ELD MPEG-4 ...
HE-AAC and HE-AAC v2 audio coding for DVB applications is standardized by TS 101 154. [ 36 ] [ 37 ] AacPlus v2 by Coding Technologies [ 38 ] is also standardized by the ETSI as TS 102 005 for Satellite services to Handheld devices (DVB-SH) below 3 GHz.
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. FAAD2 – open-source decoder for Advanced Audio Coding. There is also FAAC, the same project's encoder, but it is proprietary (but still free of charge). libgsm – Lossy compression
Nero AAC Codec; VisualOn AAC Encoder (a.k.a. libvo_aacenc) Fraunhofer FDK AAC; libaacplus; MPEG-4 Audio. Advanced Audio Coding (AAC, MPEG-4 Part 3 subpart 4), HE-AAC and AAC-LD. FAAC, FAAD2; FFmpeg; iTunes; Nero AAC Codec; MPEG-4 AAC reference software (ISO/IEC 14496-5:2001) Harmonic and Individual Lines and Noise (HILN, MPEG-4 Parametric Audio ...
.aac: The Advanced Audio Coding format is based on the MPEG-2 and MPEG-4 standards. AAC files are usually ADTS or ADIF containers. .aax: Audible : An Audiobook format, which is a variable-bitrate (allowing high quality) M4B file encrypted with DRM. MPB contains AAC or ALAC encoded audio in an MPEG-4 container. (More details below.) .act
The most widely used audio coding formats are MP3 and Advanced Audio Coding (AAC), both of which are lossy formats based on modified discrete cosine transform (MDCT) and perceptual coding algorithms. Lossless audio coding formats such as FLAC and Apple Lossless are sometimes available, though at the cost of larger files.