Dopo quattro anni di sviluppo, \u00e8 stata rilasciata la prima versione del progetto libcamera (0.0.1), che offre uno stack software per lavorare con videocamere, fotocamere e TV tuner su Linux, Android e ChromeOS, continuando a sviluppare l'API V4L2 e, nel tempo, sostituendola. Poich\u00e9 l'API della libreria \u00e8 ancora in fase di modifiche e non \u00e8 stabilizzata, il progetto \u00e8 stato sviluppato senza creare rami di versioni separate, utilizzando un modello di sviluppo continuo. In risposta alla necessit\u00e0 dei distributori di monitorare le modifiche dell'API che influenzano la compatibilit\u00e0 e per semplificare la distribuzione della libreria in pacchetti, \u00e8 stata presa la decisione di generare periodicamente versioni che riflettano il grado di cambiamento dell'ABI e dell'API. Il codice del progetto \u00e8 scritto in C++ e distribuito sotto licenza LGPLv2.1. <\/p>\n
Il progetto \u00e8 sviluppato dagli sviluppatori di sottosistemi multimediali del kernel Linux in collaborazione con alcuni produttori di telecamere, con l'obiettivo di normalizzare il supporto delle telecamere per smartphone e dispositivi embedded in Linux, che dipendono da driver proprietari. L'API V4L2 gi\u00e0 presente nel kernel Linux \u00e8 stata originariamente creata per funzionare con tradizionali webcam isolate e si \u00e8 rivelata poco adattata alla recente tendenza di trasferire le funzionalit\u00e0 della MCU sulle spalle della CPU. <\/p>\n
\u0412 \u043e\u0442\u043b\u0438\u0447\u0438\u0435 \u043e\u0442 \u0442\u0440\u0430\u0434\u0438\u0446\u0438\u043e\u043d\u043d\u044b\u0445 \u043a\u0430\u043c\u0435\u0440, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 \u043f\u0435\u0440\u0432\u0438\u0447\u043d\u043e\u0439 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0438\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0439 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u044f\u0442\u0441\u044f \u043d\u0430 \u0432\u0441\u0442\u0440\u043e\u0435\u043d\u043d\u043e\u043c \u0432 \u043a\u0430\u043c\u0435\u0440\u0443 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0435 (MCU), \u0432\u043e \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u044b\u0445 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430\u0445 \u0434\u043b\u044f \u0441\u043e\u043a\u0440\u0430\u0449\u0435\u043d\u0438\u044f \u0441\u0442\u043e\u0438\u043c\u043e\u0441\u0442\u0438 \u044d\u0442\u0438 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0432\u044b\u043d\u043e\u0441\u044f\u0442\u0441\u044f \u043d\u0430 \u043f\u043b\u0435\u0447\u0438 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0433\u043e CPU \u0438 \u0442\u0440\u0435\u0431\u0443\u044e\u0442 \u0443\u0441\u043b\u043e\u0436\u043d\u0451\u043d\u043d\u043e\u0433\u043e \u0434\u0440\u0430\u0439\u0432\u0435\u0440\u0430, \u0432\u043a\u043b\u044e\u0447\u0430\u044e\u0449\u0435\u0433\u043e \u043d\u0435 \u043f\u043e\u0434\u043b\u0435\u0436\u0430\u0449\u0438\u0435 \u043e\u0442\u043a\u0440\u044b\u0442\u0438\u044e \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0435 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u044b. \u0412 \u0440\u0430\u043c\u043a\u0430\u0445 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 libcamera \u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0438\u043a\u0438 \u0421\u041f\u041e \u0438 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u0438 \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u044f \u043f\u043e\u043f\u044b\u0442\u0430\u043b\u0438\u0441\u044c \u0441\u043e\u0437\u0434\u0430\u0442\u044c \u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0438\u0441\u0441\u043d\u043e\u0435 \u0440\u0435\u0448\u0435\u043d\u0438\u0435, \u0441 \u043e\u0434\u043d\u043e\u0439 \u0441\u0442\u043e\u0440\u043e\u043d\u044b \u0443\u0434\u043e\u0432\u043b\u0435\u0442\u0432\u043e\u0440\u044f\u044e\u0449\u0435\u0435 \u043f\u043e\u0442\u0440\u0435\u0431\u043d\u043e\u0441\u0442\u0438 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0433\u043e \u041f\u041e, \u0430 \u0441 \u0434\u0440\u0443\u0433\u043e\u0439 — \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0435 \u0437\u0430\u0449\u0438\u0442\u0438\u0442\u044c \u0438\u043d\u0442\u0435\u043b\u043b\u0435\u043a\u0442\u0443\u0430\u043b\u044c\u043d\u0443\u044e \u0441\u043e\u0431\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u0435\u0439 \u043a\u0430\u043c\u0435\u0440. <\/p>\n
Il stack proposto dalla libreria libcamera \u00e8 completamente implementato nello spazio utente. Per garantire la compatibilit\u00e0 con gli ambienti software e le applicazioni esistenti, vengono forniti strati di compatibilit\u00e0 per le API V4L, Gstreamer e Android Camera HAL. I componenti proprietari specifici per ciascuna fotocamera che interagiscono con l'hardware sono organizzati in moduli che vengono eseguiti in processi separati e comunicano con la libreria tramite IPC. I moduli non hanno accesso diretto al dispositivo e accedono all'hardware attraverso un'API intermedia, le richieste tramite la quale vengono verificate, filtrate e limitate solo all'accesso alle funzionalit\u00e0 necessarie per gestire la fotocamera. <\/p>\n
La libreria offre anche l'accesso ad algoritmi per l'elaborazione e il miglioramento della qualit\u00e0 di immagini e video (correzione del bilanciamento del bianco, riduzione del rumore, stabilizzazione video, autofocus, selezione dell'esposizione, ecc.), che possono essere integrati come librerie esterne aperte o moduli proprietari isolati. L'API fornisce accesso a funzioni come la determinazione delle funzionalit\u00e0 delle telecamere esterne e integrate, l'uso di profili di dispositivo, il trattamento degli eventi di connessione e disconnessione delle telecamere, la gestione della cattura dei dati dalle telecamere a livello di singoli fotogrammi e la sincronizzazione degli scatti con l'attivazione del flash. \u00c8 possibile gestire diverse telecamere nel sistema e catturare simultaneamente pi\u00f9 flussi video da una singola telecamera (ad esempio, uno a bassa risoluzione per videoconferenze e un altro ad alta risoluzione per registrazioni su disco). \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 V4L2 \u0438 \u0441\u043e \u0432\u0440\u0435\u043c\u0435\u043d\u0435\u043c \u0437\u0430\u043c\u0435\u043d\u0438\u0442 \u0435\u0433\u043e. \u0422\u0430\u043a \u043a\u0430\u043a API \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 \u0435\u0449\u0451 \u043f\u0440\u043e\u0434\u043e\u043b\u0436\u0430\u0435\u0442 \u043c\u0435\u043d\u044f\u0442\u044c\u0441\u044f \u0438 \u043e\u043a\u043e\u043d\u0447\u0430\u0442\u0435\u043b\u044c\u043d\u043e \u043d\u0435 \u0441\u0442\u0430\u0431\u0438\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d, \u0434\u043e \u0441\u0438\u0445 \u043f\u043e\u0440 \u043f\u0440\u043e\u0435\u043a\u0442 \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u043b\u0441\u044f \u0431\u0435\u0437 \u043e\u0442\u0432\u0435\u0442\u0432\u043b\u0435\u043d\u0438\u044f \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u0432\u044b\u043f\u0443\u0441\u043a\u043e\u0432 […]<\/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-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\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\n","aioseo_head_json":{"title":"\ud83e\udd47 Prima versione di libcamera, stack per il supporto delle telecamere su Linux | ProHoster","description":"Dopo quattro anni di sviluppo, \u00e8 stata rilasciata la prima versione del progetto libcamera (0.0.1), che offre uno stack software per la gestione di videocamere, fotocamere e TV tuner su Linux, Android e ChromeOS, continuando l'evoluzione dell'API V4L2 e destinata a sostituirla nel tempo. 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Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"