{"id":105321,"date":"2022-10-18T09:36:38","date_gmt":"2022-10-18T07:36:38","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/pervyj-vypusk-libcamera-steka-dlya-podderzhki-kamer-v-linux"},"modified":"2022-10-18T09:36:38","modified_gmt":"2022-10-18T07:36:38","slug":"pervyj-vypusk-libcamera-steka-dlya-podderzhki-kamer-v-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sl\/blog\/news\/pervyj-vypusk-libcamera-steka-dlya-podderzhki-kamer-v-linux","title":{"rendered":"Prvo izdanje libcamera, steka za podr\u0161ku za kamere u Linux-u","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Po \u0161tirih letih razvoja je bil oblikovan prvi izdelek projekta libcamera (0.0.1), ki ponuja programski sklop za delo z video kamerami, fotokamerami in TV-tunerji v Linuxu, Androidu in ChromeOS, kar nadaljuje razvoj API V4L2 in ga bo s\u010dasoma nadomestilo. Ker se API knji\u017enice \u0161e naprej spreminja in \u0161e ni dokon\u010dno stabiliziran, je projekt \u0161e vedno potekal brez lo\u010devanja posameznih izdaj z uporabo nenehnega modela razvoja. V odgovor na potrebo distribucij po sledenju spremembam API, ki vplivajo na zdru\u017eljivost, in za poenostavitev dostave knji\u017enice v paketih, je zdaj sprejeta odlo\u010ditev o ob\u010dasnem oblikovanju izdaj, ki odra\u017eajo stopnjo spremembe ABI in API. Kodo projekta je treba napisati v C++ in se distribuira pod licenco LGPLv2.1. <\/p>\n

Projekt razvijajo razvijalci multimedi\u010dnih sistemov jedra Linux v sodelovanju z nekaterimi proizvajalci kamer z namenom normalizacije situacije s podporo kamer za pametne telefone in vgrajene naprave v Linuxu, ki so vezane na proprietarne gonilnike. API V4L2, ki \u017ee obstaja v jedru Linux, je bil sprva ustvarjen za delo s tradicionalnimi lo\u010denimi spletnih kamerami in je slabo prilagojen za nedavno prisotno tendenco prenosa funkcionalnosti MCU na ramena CPU. <\/p>\n

Za razliko od tradicionalnih kamer, kjer se operacije osnovne obdelave slik izvajajo na vgrajenem specializiranem procesorju (MCU), se v vdelanih napravah za zmanj\u0161anje stro\u0161kov te funkcije prenesejo na glavni CPU in zahtevajo zapleteno programsko opremo, ki vklju\u010duje licencirane komponente, za katere ni mogo\u010de dobiti odprtokodnih pravic. V okviru projekta libcamera so si privr\u017eenci odprte programske opreme in proizvajalci strojne opreme prizadevali ustvariti kompromisno re\u0161itev, ki bi z ene strani zadovoljila potrebe razvijalcev odprte programske opreme, z druge strani pa omogo\u010dila za\u0161\u010dito du\u0161evne lastnine proizvajalcev kamer. <\/p>\n

Predlagani libcamera sklop je v celoti implementiran v uporabni\u0161kem prostoru. Za zagotovitev zdru\u017eljivosti z obstoje\u010dimi programskimi okolji in aplikacijami so na voljo vmesniki za zdru\u017eljivost z API V4L, Gstreamer in Android Camera HAL. Specifi\u010dne za vsako kamero lastni\u0161ke komponente interakcije s strojno opremo so oblikovane kot moduli, ki delujejo v lo\u010denih procesih in komunicirajo z knji\u017enico preko IPC. Moduli nimajo neposrednega dostopa do naprave in se nana\u0161ajo na strojno opremo preko vmesnega API, katerih zahteve se preverjajo, filtrirajo in omejujejo samo na funkcionalnosti, potrebne za upravljanje kamere. <\/p>\n

Knji\u017enica prav tako nudi dostop do algoritmov za obdelavo in izbolj\u0161anje kakovosti slik in videov (prilagoditev beline, zmanj\u0161anje \u0161uma, stabilizacija videa, samodejno ostrenje, izbira ekspozicije itd.), ki se lahko povezujejo kot odprtokodne zunanje knji\u017enice ali lastni\u0161ki izolirani moduli. API nudi dostop do tak\u0161nih funkcij, kot so dolo\u010ditev funkcionalnosti obstoje\u010dih zunanjih in vgrajenih kamer, uporaba profilov naprav, obdelava dogodkov povezovanja in odklapljanja kamer, ter upravljanje zajema podatkov iz kamer na ravni posameznih sli\u010dic in sinhronizacija posnetkov z delovanjem bliskavice. Mo\u017eno je lo\u010deno delo z ve\u010d kamerami v sistemu in organizacija zajema hkrati ve\u010d video tokov z ene kamere (na primer, en z nizko lo\u010dljivostjo za videokonference in drugi z visoko lo\u010dljivostjo za arhivski zapis na disk).
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Izvor: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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