{"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\/cs\/blog\/news\/pervyj-vypusk-libcamera-steka-dlya-podderzhki-kamer-v-linux","title":{"rendered":"Prvn\u00ed verze libcamera, souboru pro podporu kamer v Linuxu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Po \u010dty\u0159ech letech v\u00fdvoje byla vytvo\u0159ena prvn\u00ed verze projektu libcamera (0.0.1), kter\u00e1 nab\u00edz\u00ed softwarov\u00fd stack pro pr\u00e1ci s videokamerami, fotoapar\u00e1ty a TV tunery v Linuxu, Androidu a ChromeOS, p\u0159i\u010dem\u017e pokra\u010duje ve v\u00fdvoji API V4L2 a \u010dasem ho nahrad\u00ed. Jeliko\u017e API knihovny se st\u00e1le m\u011bn\u00ed a nen\u00ed je\u0161t\u011b kone\u010dn\u011b stabilizov\u00e1no, projekt se dosud vyv\u00edjel bez vyd\u00e1v\u00e1n\u00ed jednotliv\u00fdch verz\u00ed, pou\u017e\u00edvaj\u00edc\u00ed kontinu\u00e1ln\u00ed model v\u00fdvoje. V reakci na pot\u0159ebu distribuc\u00ed sledovat zm\u011bny API, kter\u00e9 ovliv\u0148uj\u00ed kompatibilitu, a pro usnadn\u011bn\u00ed dod\u00e1vek knihovny v bal\u00ed\u010dc\u00edch, bylo nyn\u00ed rozhodnuto pravideln\u011b vytv\u00e1\u0159et release, kter\u00e9 odr\u00e1\u017e\u00ed \u00farove\u0148 zm\u011bn ABI a API. K\u00f3d projektu je naps\u00e1n v C++ a je distribuov\u00e1n pod licenc\u00ed LGPLv2.1. <\/p>\n

Projekt vyv\u00edj\u00ed t\u00fdm v\u00fdvoj\u00e1\u0159\u016f multimedi\u00e1ln\u00edch subsyst\u00e9m\u016f j\u00e1dra Linux ve spolupr\u00e1ci s n\u011bkter\u00fdmi v\u00fdrobci kamer, s c\u00edlem normalizace situace s podporou kamer pro smartphony a vestav\u011bn\u00e1 za\u0159\u00edzen\u00ed v Linuxu, kter\u00e9 jsou v\u00e1z\u00e1ny na propriet\u00e1rn\u00ed ovlada\u010de. Ji\u017e existuj\u00edc\u00ed API V4L2 v j\u00e1dru Linux bylo p\u016fvodn\u011b vytvo\u0159eno pro pr\u00e1ci s tradi\u010dn\u00edmi odd\u011blen\u00fdmi webov\u00fdmi kamerami a je \u0161patn\u011b p\u0159izp\u016fsobeno nov\u011b se objevuj\u00edc\u00ed tendenci p\u0159en\u00e1\u0161et funk\u010dnost MCU na ramena CPU. <\/p>\n

Na rozd\u00edl od tradi\u010dn\u00edch kamer, ve kter\u00fdch jsou operace prim\u00e1rn\u00ed \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 obraz\u016f prov\u00e1d\u011bny specializovan\u00fdm procesorem (MCU) integrovan\u00fdm v kame\u0159e, u vestavn\u00fdch za\u0159\u00edzen\u00ed jsou tyto funkce z d\u016fvodu sn\u00ed\u017een\u00ed n\u00e1klad\u016f p\u0159eneseny na hlavn\u00ed CPU a vy\u017eaduj\u00ed slo\u017eit\u011bj\u0161\u00ed ovlada\u010d, kter\u00fd zahrnuje komponenty pod licenc\u00ed, je\u017e nelze zp\u0159\u00edstupnit. V r\u00e1mci projektu libcamera se p\u0159\u00edznivci otev\u0159en\u00e9ho softwaru a v\u00fdrobci hardwaru sna\u017eili vytvo\u0159it kompromisn\u00ed \u0159e\u0161en\u00ed, kter\u00e9 na jedn\u00e9 stran\u011b spl\u0148uje pot\u0159eby v\u00fdvoj\u00e1\u0159\u016f otev\u0159en\u00e9ho softwaru a na druh\u00e9 stran\u011b chr\u00e1n\u00ed du\u0161evn\u00ed vlastnictv\u00ed v\u00fdrobc\u016f kamer. <\/p>\n

Navrhovan\u00e1 knihovna libcamera je pln\u011b implementov\u00e1na v u\u017eivatelsk\u00e9m prostoru. Pro zaji\u0161t\u011bn\u00ed kompatibility s existuj\u00edc\u00edmi softwarov\u00fdmi prost\u0159ed\u00edmi a aplikacemi jsou poskytov\u00e1ny vrstvy pro kompatibilitu s API V4L, Gstreamer a Android Camera HAL. Specifick\u00e9 pro ka\u017edou kameru propriet\u00e1rn\u00ed komponenty interakce s hardwarem jsou uspo\u0159\u00e1d\u00e1ny jako moduly, kter\u00e9 b\u011b\u017e\u00ed v samostatn\u00fdch procesech a komunikuj\u00ed s knihovnou pomoc\u00ed IPC. Moduly nemaj\u00ed p\u0159\u00edm\u00fd p\u0159\u00edstup k za\u0159\u00edzen\u00ed a p\u0159istupuj\u00ed k hardwaru prost\u0159ednictv\u00edm mezivrstvy API, p\u0159i\u010dem\u017e po\u017eadavky jsou kontrolov\u00e1ny, filtrov\u00e1ny a omezeny pouze na funkce nezbytn\u00e9 pro ovl\u00e1d\u00e1n\u00ed kamery. <\/p>\n

Knihovna tak\u00e9 poskytuje p\u0159\u00edstup k algoritm\u016fm pro zpracov\u00e1n\u00ed a zlep\u0161en\u00ed kvality obraz\u016f a vide\u00ed (nastaven\u00ed vyv\u00e1\u017een\u00ed b\u00edl\u00e9, odstran\u011bn\u00ed \u0161umu, stabilizace videa, automatick\u00e9 ost\u0159en\u00ed, volba expozice atd.), kter\u00e9 mohou b\u00fdt p\u0159ipojeny jako otev\u0159en\u00e9 extern\u00ed knihovny nebo propriet\u00e1rn\u00ed izolovan\u00e9 moduly. API poskytuje p\u0159\u00edstup k takov\u00fdm funkc\u00edm, jako je ur\u010den\u00ed funkcionality dostupn\u00fdch extern\u00edch a vestav\u011bn\u00fdch kamer, pou\u017e\u00edv\u00e1n\u00ed profil\u016f za\u0159\u00edzen\u00ed, zpracov\u00e1n\u00ed ud\u00e1lost\u00ed p\u0159ipojen\u00ed a odpojen\u00ed kamer, \u0159\u00edzen\u00ed zachycov\u00e1n\u00ed dat z kamer na \u00farovni jednotliv\u00fdch sn\u00edmk\u016f a synchronizace sn\u00edmk\u016f se \u010dinnost\u00ed blesku. Je mo\u017en\u00e1 samostatn\u00e1 pr\u00e1ce s v\u00edce kamerami v syst\u00e9mu a organizace najednou v\u00edce video stream\u016f z jedn\u00e9 kamery (nap\u0159\u00edklad jeden s n\u00edzk\u00fdm rozli\u0161en\u00edm pro videokonference a druh\u00fd s vysok\u00fdm rozli\u0161en\u00edm pro archivaci na disk).
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041f\u043e\u0441\u043b\u0435 \u0447\u0435\u0442\u044b\u0440\u0451\u0445 \u043b\u0435\u0442 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0441\u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d \u043f\u0435\u0440\u0432\u044b\u0439 \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u0440\u043e\u0435\u043a\u0442\u0430 libcamera (0.0.1), \u043f\u0440\u0435\u0434\u043b\u0430\u0433\u0430\u044e\u0449\u0435\u0433\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u044b\u0439 \u0441\u0442\u0435\u043a \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0441 \u0432\u0438\u0434\u0435\u043e\u043a\u0430\u043c\u0435\u0440\u0430\u043c\u0438, \u0444\u043e\u0442\u043e\u043a\u0430\u043c\u0435\u0440\u0430\u043c\u0438 \u0438 TV-\u0442\u044e\u043d\u0435\u0440\u0430\u043c\u0438 \u0432 Linux, Android \u0438 ChromeOS, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043f\u0440\u043e\u0434\u043e\u043b\u0436\u0430\u0435\u0442 \u0440\u0430\u0437\u0432\u0438\u0442\u0438\u0435 API 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[…]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-105321","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Prvn\u00ed vyd\u00e1n\u00ed libcamera, stack pro podporu kamer v Linuxu | ProHoster","description":"Po \u010dty\u0159ech letech v\u00fdvoje byl uveden prvn\u00ed vyd\u00e1n\u00ed projektu libcamera (0.0.1), kter\u00e9 nab\u00edz\u00ed softwarov\u00fd stack pro pr\u00e1ci s videokamerami, fotoapar\u00e1ty a TV tunery v Linuxu, Androidu a ChromeOS, kter\u00fd 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