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What is CVBuffer/ROPPONGI.swift
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noppefoxwolf
December 27, 2018
Programming
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What is CVBuffer/ROPPONGI.swift
noppefoxwolf
December 27, 2018
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Transcript
$7#V⒎FSͷ 30110/(*TXJGUୈճձ
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$7#V⒎FS
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දతͳ$7#V⒎FSͷੜ w $7*NBHF#V⒎FS w $71JYFM#V⒎FS w $70QFO(-&45FYUVSF
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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
$71JYFM#V⒎FSWT$7*NBHF#V⒎FS w 2UZQFBMJBTͳΜͩ͠ಉ͡Ͱ͠ΐʁ w "ԶʹΘ͔ΒΜ
$71JYFM#V⒎FSWT$7*NBHF#V⒎FS w $71JYFM#VGGFS ϝϞϦͷϐΫηϧόοϑΝʹΞΫηε͢ΔͨΊͷΫϥ ε w $7*NBHF#VGGFS ϝϞϦͷը૾ʹΞΫηε͢ΔͨΊͷΫϥε
ϐΫηϧใΞΫηεͷྫ w ॎԣͷαΠζ w σʔλαΠζ ը૾ΞΫηεͷྫ w Χϥʔεϖʔε
υΩϡϝϯτ $7*NBHF#VGGFS(FU%JTQMBZ4J[F @ "$(4J[FTUSVDUVSFEFpOJOHUIFOPNJOBMEJTQMBZ TJ[FPGUIFCV⒎FS3FUVSOT[FSPTJ[FJGDBMMFE XJUIBOPO$7*NBHF#VGGFS3FGUZQFPS /6--
ݕূ var pb: CVPixelBuffer? = nil CVPixelBufferCreate(kCFAllocatorDefault, 128, 128, kCVPixelFormatType_32BGRA,
nil, &pb) CVImageBufferGetDisplaySize(pb!) // -> (128.0, 128.0)
ಈըΛѻ͏ػձͷ૿Ճ w ಈը৴ΞϓϦIFWDͷొɺ$PSF7JEFPʹ৮ΕΔػ ձ͕૿͍͑ͯΔ w σʔλϝσΟΞΛѻ͏#V⒎FSܥΫϥεͷར༻ස ૿Ճ w ΈΜͳɺؾ࣋ͪͰ$71JYFM#V⒎FSΛ͍ͬͯ·ͤΜ͔ʁ
ؾ࣋ͪͰ͍ͬͯΔ
6**NBHFͱͷҧ͍
6**NBHFͱͷҧ͍ w $7#V⒎FS ΞυϨεΛࢀর͍ͯ͠Δ͚ͩͳͷͰɺϩοΫ͢Δ͕ ίϐʔΩϟογϡ͞Εͳ͍ தؒϨϯμϦϯάউखʹ͞Εͳ͍ ϏσΦͷΑ͏ʹߴʹॲཧ͢Δඞཁ͕͋ΔՕॴʹ࠷ద
ΞυϨεͷϩοΫ $7#V⒎FSͷσʔλόοϑΝʹ$16͔ΒΞΫηε͢Δ ߹ΞυϨεΛϩοΫ͢Δඞཁ͕͋Δ CVPixelBufferLockBaseAddress(pb, .readOnly) defer { CVPixelBufferUnlockBaseAddress(pb, .readOnly) }
$71JYFM#V⒎FSͷதΛදࣔ͢Δ
Ұ൪؆୯ͳํ๏ $71JYFM#V⒎FS$**NBHF6**NBHF CIImage(cvPixelBuffer: CVPixelBuffer) UIImage(ciImage: ciImage)
.FUBMͰදࣔ͢Δ CVMetalTextureCacheܦ༝Ͱ $71JYFM#V⒎FS.5-5FYUVSF .5,7JFXͳͲͰදࣔ
0QFO(-&4Ͱදࣔ͢Δ CVOpenGLESTextureCacheܦ༝Ͱ $71JYFM#V⒎FS0QFO(-&45FYUVSF (-,7JFXͳͲͰදࣔ
$.4BNQMF#V⒎FSͱ
$.4BNQMF#V⒎FSͱ ɾඞͣ͠$71JYFM#V⒎FS͕ೖ͍ͬͯΔͱݶΒͳ͍
ͦ͏ͱࢥ͍ͬͯͨ ɾ$71JYFM#V⒎FS͔Β$.4BNQMF#V⒎FSΛ࡞Δ ɾϢʔεέʔε ɾར