Zaka zisanu ndi zinayi kuchokera pamene ulusi wofunikira womaliza udasindikizidwa, gulu la Xiph.Org linayambitsa mtundu watsopano wa codec yaulere ya FLAC 1.4.0, yomwe imapereka ma encoding popanda kutayika bwino. FLAC imagwiritsa ntchito njira zokhotakhota zosatayika zokha, zomwe zimatsimikizira kusungika koyambirira kwa nyimbo zomvera komanso kudziwika kwake ndi mtundu wamawu osungidwa. Panthawi imodzimodziyo, njira zoponderezedwa zopanda kutaya zomwe zimagwiritsidwa ntchito zimathandizira kuchepetsa kukula kwa mtsinje wapachiyambi wa audio ndi 50-60%. FLAC ndi mtundu waulere waulere, womwe umatanthawuza osati kutseguka kwa malaibulale ndi kukhazikitsidwa kwa ma encoding ndi decoding, komanso kusakhalapo kwa zoletsa pakugwiritsa ntchito mafotokozedwe komanso kupanga mitundu yochokera. Khodi ya library imagawidwa pansi pa layisensi ya BSD.
Zosintha zofunika kwambiri ndi izi:
- Thandizo lowonjezera la encoding ndi decoding ndi quantization bit ya 32 bits pa sampuli (bit-per-sample).
- Kuwongolera kwamakanikizidwe pamilingo 3 mpaka 8, pamtengo wochepetsera pang'ono liwiro la kabisidwe chifukwa cha kulondola kwa mawerengedwe a autocorrelation. Kuthamanga kwa encoding kwa milingo 0, 1 ndi 2. Kuwongolera pang'ono kwapang'onopang'ono pamilingo 1 mpaka 4 chifukwa cha kusintha kwa ma adaptive heuristics.
- Kuthamanga kwamphamvu kwambiri pamapurosesa a 64-bit ARMv8 pogwiritsa ntchito malangizo a NEON. Kuchita bwino pa mapurosesa a x86_64 omwe amathandizira seti ya malangizo a FMA.
- API ndi ABI ya libFLAC ndi libFLAC ++ malaibulale asinthidwa (kusintha ku mtundu 1.4 kumafuna kukonzanso mapulogalamu).
- Pulogalamu yowonjezera ya XMMS yachotsedwa ndipo ichotsedwa pakatulutsidwa kotsatira.
- Laibulale ya libFLAC ndi zida za flac zimapereka mwayi wochepetsera ma bitrate ochepera a mafayilo a FLAC, mpaka 1 pang'ono pachitsanzo chilichonse (atha kukhala othandiza pokonzekera kuwulutsa kwamoyo).
- Zakhala zotheka kuyika mafayilo okhala ndi mitengo yazitsanzo mpaka 1048575 Hz.
- Flac utility imagwiritsa ntchito zosankha zatsopano "-limit-min-bitrate" ndi "-keep-foreign-metadata-if-present".
Source: opennet.ru