What is CVBuffer/ROPPONGI.swift

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#V⒎FSܥΫϥεͷۙگ w ݹ͍ΫϥεͳͷͰɺ΄΅มߋ͸ͳ͍ w ͔͠͠؀ڥ͸มԽɺΫϥΠΞϯτͰͷσίʔυ΍ 0QFO(-&4΍.FUBM΁ͷσʔλ౉͠ʹར༻͞ΕΔ

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$7#V⒎FS

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$7#V⒎FS w $7#V⒎FSͷ$7͸$PSF7JEFPͷ$7 σʔλόοϑΝΛ௚઀৮Βͣʹ؆୯ʹಡΈॻ͖͢Δͨ Ίͷ*'

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୅දతͳ$7#V⒎FSͷ೿ੜ w $7*NBHF#V⒎FS w $71JYFM#V⒎FS w $70QFO(-&45FYUVSF

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$7#V⒎FS͡Όͳ͍ํ w $.4BNQMF#V⒎FS ͜Ε͸ҧ͏ w $.#MPDL#V⒎FS ͜Ε΋ҧ͏

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$7#V⒎FSͷਖ਼ମ w $7*NBHF#V⒎FS public typealias CVImageBuffer = CVBuffer w $71JYFM#V⒎FS public typealias CVPixelBuffer = CVImageBuffer w $70QFO(-&45FYUVSF public typealias CVOpenGLESTexture = CVImageBuffer

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ϐΫηϧ৘ใΞΫηεͷྫ w ॎԣͷαΠζ w σʔλαΠζ ը૾ΞΫηεͷྫ w Χϥʔεϖʔε

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ݕূ var pb: CVPixelBuffer? = nil CVPixelBufferCreate(kCFAllocatorDefault, 128, 128, kCVPixelFormatType_32BGRA, nil, &pb) CVImageBufferGetDisplaySize(pb!) // -> (128.0, 128.0)

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ؾ࣋ͪͰ࢖͍ͬͯΔ

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6**NBHFͱͷҧ͍

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6**NBHFͱͷҧ͍ w $7#V⒎FS ΞυϨεΛࢀর͍ͯ͠Δ͚ͩͳͷͰɺϩοΫ͸͢Δ͕ ίϐʔ΍Ωϟογϡ͸͞Εͳ͍ தؒϨϯμϦϯά΋উखʹ͞Εͳ͍ ϏσΦͷΑ͏ʹߴ଎ʹॲཧ͢Δඞཁ͕͋ΔՕॴʹ࠷ద

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ΞυϨεͷϩοΫ $7#V⒎FSͷσʔλόοϑΝʹ$16͔ΒΞΫηε͢Δ ৔߹͸ΞυϨεΛϩοΫ͢Δඞཁ͕͋Δ CVPixelBufferLockBaseAddress(pb, .readOnly) defer { CVPixelBufferUnlockBaseAddress(pb, .readOnly) }

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$71JYFM#V⒎FSͷத਎Λදࣔ͢Δ

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Ұ൪؆୯ͳํ๏ $71JYFM#V⒎FS$**NBHF6**NBHF CIImage(cvPixelBuffer: CVPixelBuffer) UIImage(ciImage: ciImage)

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.FUBMͰදࣔ͢Δ CVMetalTextureCacheܦ༝Ͱ $71JYFM#V⒎FS.5-5FYUVSF .5,7JFXͳͲͰදࣔ

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0QFO(-&4Ͱදࣔ͢Δ CVOpenGLESTextureCacheܦ༝Ͱ $71JYFM#V⒎FS0QFO(-&45FYUVSF (-,7JFXͳͲͰදࣔ

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$.4BNQMF#V⒎FSͱ͸

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$.4BNQMF#V⒎FSͱ͸ ɾඞͣ͠΋$71JYFM#V⒎FS͕ೖ͍ͬͯΔͱ͸ݶΒͳ͍

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