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Video decode on iOS
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noppefoxwolf
June 21, 2018
Programming
3
2.2k
Video decode on iOS
iOS上でビデオコンテナのデコード手法をAssetReaderとVTDecompressSessionの比較を通して学びます。
noppefoxwolf
June 21, 2018
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Transcript
7JEFPEFDPEFPOJ04 QPUBUPUJQT ! !OPQQFGPYXPMG
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! !OPQQFGPYXPMG
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! !OPQQFGPYXPMG
,JUTVOFCJͷΈ ϏσΦͷσίʔυˠϚεΫ߹ˠඳը ! !OPQQFGPYXPMG
,JUTVOFCJͷΈ ϏσΦͷσίʔυˠϚεΫ߹ˠඳը ࠓ͜ͷลͷΛ͠·͢ ! !OPQQFGPYXPMG
ϏσΦϑΝΠϧͷલఏࣝ ྫ͑ɺNQNPWXNW ෳͷϝσΟΞίϯςφͷू·ΓɺओʹಈըͱԻ͕֨ ೲ͞Ε͍ͯΔͷ͕ҰൠతͳϑΥʔϚοτ ଞʹࣈນ੩ࢭըͷίϯςφؚ͕·ΕΔ͜ͱ͋Δ ! !OPQQFGPYXPMG
ϏσΦϑΝΠϧͷલఏࣝ ! !OPQQFGPYXPMG
ϏσΦϑΝΠϧͷσίʔυͱ ϝσΟΞίϯςφΛ࠶ੜग़དྷΔঢ়ଶʹ෮ݩ͢Δ ‣ ϏσΦίϯςφ͔Β̍ϑϨʔϜ͝ͱͷը૾Λऔಘ ‣ Իίϯςφ͔ΒԻใΛऔಘ ‣ ࣈນίϯςφ͔ΒจࣈྻΛऔಘ FUD ͜ΕΒΛߦͬͯಈըͱͯ͠࠶ੜ͢Δ
! !OPQQFGPYXPMG
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J04ͰͷϏσΦίϯςφͷσίʔυํ๏ ‣ "7"TTFU3FBEFS ‣ 75%FDPNQSFTTJPO4FTTJPO ‣ ⒎NQFH ! !OPQQFGPYXPMG
ରԠίʔσοΫͷ֬ೝ ͜ΕΒͷϑϨʔϜϫʔΫ෦Ͱ04ͷσίʔμ ͷ࣮Λར༻͍ͯ͠Δɻ ಉ͡NQͰ)͔)Έ͍ͨͳίʔσοΫͷҧ ͍͕͋Γɺ04ʹΑͬͯαϙʔτ͕ҟͳΔͷͰ ҙɻ ! !OPQQFGPYXPMG
ྫ͑)&7$Ұ෦ͷνοϓͰ͔͠ϋΠύϑΥʔϚϯεͳσίʔυΛ͢Δ͜ͱ͕Ͱ͖ͳ͍ɻ ! !OPQQFGPYXPMG
ରԠίʔσοΫͷ֬ೝ ެࣜαΠτͷ4QFDΈΕαϙʔτ͍ͯ͠ΔίʔσοΫ ͕Θ͔Δɻ ରԠίʔσοΫΛऔಘ͢Δϝιουݟ͔ͭΒͳ͔ͬ ͨɻ ! IUUQTXXXBQQMFDPNKQJQIPOFYTQFDTͱ͔ ! !OPQQFGPYXPMG
"7"TTFU3FBEFS let reader = try! AVAssetReader(asset: asset) let output =
AVAssetReaderTrackOutput(track: asset.videoTrack) reader.add(output) reader.startReading() output.copyNextSampleBuffer() output.copyNextSampleBuffer() output.copyNextSampleBuffer() ... ͱͯ؆୯ DPQZ/FYU4BNQMF#V⒎FSΛݺͿͨͼʹऔΕΔϑϨʔϜ ͷλΠϜελϯϓ͕ਐΉ ! !OPQQFGPYXPMG
"7"TTFU3FBEFSͷಛ ‣ ରԠίʔσοΫͰ͋ΕίʔσοΫΛؾʹͤͣʹσ ίʔυͰ͖Δ ‣ ඇৗʹ؆୯ͳΠϯλʔϑΣΠε ‣ ࣍ͷTBNQMF#V⒎FS͔͠औΕͳ͍ ! !OPQQFGPYXPMG
75%FDPNQSFTTJPO4FTTJPOͷಛ ϨΠϠʔͷϏσΦσίʔυ༻ϑϨʔϜϫʔΫ ଟ"7"TTFU3FBEFS"7"TTFU3FBEFS5SBDL0VUQVU ͜ΕΛ͍ͬͯΔʁ ෳࡶͰ໘ͳΘΓʹॊೈੑ͕ߴ͍ ! !OPQQFGPYXPMG
75%FDPNQSFTTJPO4FTTJPOͷྲྀΕ IBWDΛׂ ө૾ؚ͕·ΕΔνϟϯΫΛऔΓग़͢ 75%FDPNQSFTTJPO4FTTJPOΛੜ νϟϯΫΛ4FTTJPOʹ͢
σίʔυࡁΈͷ*NBHF#V⒎FS͕ίʔϧόοΫʹฦ͞ αϯϓϧͰྫͱͯ͠ΩʔϑϨʔϜΛऔΓग़͍ͯ͠Δ ! !OPQQFGPYXPMG
IBWDΛׂ /"-pMFGPSNBU ! !OPQQFGPYXPMG
! !OPQQFGPYXPMG
ө૾ؚ͕·ΕΔνϟϯΫΛऔΓग़͢ /"-ͷϔομΛࢀরͯ͠Yͷͷ͕ΩʔϑϨʔϜΛ ͍࣋ͬͯΔɻ ࠩใ͕ෆཁͳશͳϑϨʔϜ ! !OPQQFGPYXPMG
OBMVOJUUZQF *40*&$Ͱఆٛ IUUQXXXTUBSPDFBOTPSHFCPPL*40QEG ! !OPQQFGPYXPMG
75%FDPNQSFTTJPO4FTTJPOΛੜ VTDecompressionSessionCreate(_:, _:, _:, _:, _:, _:) ҾʹίʔϧόοΫઌϑϨʔϜͷใ QJYFM'PSNBU )ͷύϥϝʔλ
͕ඞཁ ! !OPQQFGPYXPMG
νϟϯΫΛ4FTTJPOʹ͢ CMSampleBufferCreateReady(sampleBuffer) VTDecompressionSessionDecodeFrame(_:, _:, _:, _:, &sampleBuffer) CZUFྻΛ͢ࣄग़དྷͳ͍ͷͰɺCZUFྻ͔Β ࡞ͬͨ#MPDL#V⒎FSΛݩʹ4BNQMF#V⒎FSΛ࡞Γ͢ɻ !
!OPQQFGPYXPMG
σίʔυࡁΈͷ*NBHF#V⒎FS͕ίʔϧόοΫʹฦ͞Ε Δ callback.decompressionOutputCallback = { (_, _, _, _, imageBuffer,
_, _) in // imageBuffer } 4FTTJPOʹొͨ͠DBMMCBDLσίʔυ͞Εͨ JNBHF#V⒎FS͕ฦͬͯ͘Δ ! !OPQQFGPYXPMG
! !OPQQFGPYXPMG
1SPT$POT &BTZ 4USFBNJOH 1FSGPSNBODF $VTUPNJ[F "7"TTFU3FB EFS P Y P
˚ 75%FDPNQSF TTJPO4FTTJPO Y P P P ϦϞʔτͷΞηοτͷQJYFM#V⒎FSऔΕͳ͍ ! !OPQQFGPYXPMG
75%FDPNQSFTTJPO4FTTJPO ‣ ετϦʔϛϯάͰΩϟϓνϟ͕औΕΔ ‣ "7"TTFU3FBEFSʹόά͕͋ͬͯେৎ ‣ ࢄͯ͠Τϯίʔυ͍ͨ࣌͠ͱ͔ʹศར ‣ ΤϥʔνΣοΫͱ͔ͪΌΜͱ͠ͳ͍ͱ͍͚ͳ͍ !
!OPQQFGPYXPMG
)%FDPEF4BNQMF IUUQTHJUIVCDPNOPQQFGPYXPMG)%FDPEF4BNQMF ! !OPQQFGPYXPMG
OPQQFGPYXPMG,JUTVOFCJ VTDecompressionSessionະαϙʔτ ύϑΥʔϚϯεʹҰఆͷޮՌ͕͋Γͦ͏Ͱ͋Ε࣮༧ ఆ ! !OPQQFGPYXPMG
J04%$ͷ$G1ग़ͯ͠Έ·ͨ͠ɻ ࠓճͷͷ΄͔ɺ,JUTVOFCJΛ.FUBMରԠͤͯ͞Ͳ͏ͳ Δͷ͔ͱ͔ൺֱͯ͠Έ͍ͨͱࢥ͍ͬͯ·͢ ! !OPQQFGPYXPMG