AbemaTVを支えるアプリの優しさ / abematv_devcon_2017

"CFNB57Λࢧ͑Δ ΞϓϦͷ༏͠͞

.BTBLJ0HBUB "OESPJE&OHJOFFS"CFNB57 *OD IUUQTHJUIVCDPNPHBDMFKBQBO !PHBDMFKBQBO

༏͠͞ͱ͸ʁ

Զࢯɿʮ͍ͨͩ·ʔʯ Շࢯɿʮ͓ؼΓʔɺ͝൧࡞ͬͯ͋ΔΑɻʯ Զࢯɿʢ೥ʹҰ౓ͷح੻ʜʣ༏͠͞ʂʂ

lࢥ͍΍Γ͕͋ͬͯ਌੾z ग़య.BDࣙॻΞϓϦεʔύʔେࣙྛ

ΞϓϦͷ༏͠͞ͱ͸

ωοτϫʔΫ௨৴Λ͍ͩ͡ʹ ΞϓϦͷͤ͘͞ΜGPS6TFS όοςϦʔΛ͔ͭ͏ͳ ΨϯΨϯ͍͜͏ͥ Ξχϝʔγϣϯͤ͞Ζ

6*ʗ69Λ͍ͩ͡ʹ ΞϓϦͷͤ͘͞ΜGPS4ZTUFN ωοτϫʔΫଳҬΛ࢖͏ͳ Ωϟογϡ͠Α͏ͥ ௿ίετͰӡ༻ͤ͞Ζ

lωοτϫʔΫ௨৴ྔΛ཈͑Δz "CFNB57ΞϓϦͷ༏͠͞

"CFNB57Λࢧ͑Δ ΞϓϦͷ༏͠͞ ʙ"OESPJEΞϓϦͷऔΓ૊Έʙ

͕ɺɺ

݄๭೔ɻ ⚡࣌ؒੜ์ૹಛ൪ܾఆ⚡

ෛՙରࡦΛਐΊͨ݁Ռɺ

༏͠͞ʹෆඋ͕͋Γ·ͨ͠

"CFNB57Λࢧ͑Δ ΞϓϦͷ༏͠͞

"CFNB57Λࢧ͑Δ ΞϓϦͷ༏͠͞ XJUI

ϓϨΠϦετऔಘ͠ա͗໰୊

)-4ʢ)551-JWF4USFBNJOHʣ QMBZMJTU@MJWFNV &95.6 &9597&34*0/ &9595"3(&5%63"5*0/ &959.&%*"4&26&/$& &95*/' UT &95*/'
UT &95*/' UT

UT &95*/' UT UT

UT &95*/' UT UT UT

UT &95*/' UT UT UT UT

UT &95*/' UT UT UT UT UT

)-4"EBQUJWF4USFBNJOH NBTUFS@QMBZMJTUNV &95.6 &959ʜ #"/%8*%5) QMBZMJTU@MJWFNV &959ʜ #"/%8*%5) QMBZMJTU@MJWFNV &959ʜ
#"/%8*%5) QMBZMJTU@MJWFNV &959ʜ #"/%8*%5) QMBZMJTU@MJWFNV &959ʜ #"/%8*%5) QMBZMJTU@MJWFNV

#"/%8*%5) QMBZMJTU@MJWFNV &959ʜ #"/%8*%5) QMBZMJTU@MJWFNV &959ʜ #"/%8*%5) QMBZMJTU@MJWFNV NV Q

#"/%8*%5) QMBZMJTU@MJWFNV &959ʜ #"/%8*%5) QMBZMJTU@MJWFNV &959ʜ #"/%8*%5) QMBZMJTU@MJWFNV NV Q NV Q

֤σόΠεͷϓϨΠϦετऔಘִؒ ϥΠϒ഑৴Ͱ54ϑΝΠϧͷηάϝϯτִ͕ؒඵͷ৔߹ɻ 1$ 8&# J04 "OESPJE

֤σόΠεͷϓϨΠϦετऔಘִؒ ϥΠϒ഑৴Ͱ54ϑΝΠϧͷηάϝϯτִ͕ؒඵͷ৔߹ɻ 1$ 8&# J04 "OESPJE ໿ඵִؒ ໿ඵִؒ

֤σόΠεͷϓϨΠϦετऔಘִؒ ϥΠϒ഑৴Ͱ54ϑΝΠϧͷηάϝϯτִ͕ؒඵͷ৔߹ɻ 1$ 8&# J04 "OESPJE ໿ඵִؒ ໿ඵִؒ ໿ ඵִؒ

ŧŖƃ

݁࿦ɺ&YP1MBZFSͷෆ۩߹Ͱͨ͠ɻɻ IUUQTHJUIVCDPNHPPHMF &YP1MBZFSQVMM

ߴϏοτϨʔτ΁੾ΓସΘΓޙ΋Q͕औಘ͞Εଓ͚͍ͯͨ NBTUFS@QMBZMJTUNV &95.6 &959ʜ #"/%8*%5) QMBZMJTU@MJWFNV &959ʜ #"/%8*%5) QMBZMJTU@MJWFNV &959ʜ

͜ΕͰ໰୊ղফ

ը໘ʹ࠷దͳϏοτϨʔτ੍ޚ

"CFNB57։ہ౰ॳ೥݄ ΞϓϦ͸ԣը໘ݻఆͰࢹௌ໘ͷը໘αΠζ΋ύλʔϯͷΈɻ

"CFNB57։ہप೥೥݄ ΞϓϦ͸ैདྷͷԣը໘ʹՃ͑ɺॎը໘Ͱͷࢹௌʹ΋ରԠɻ

"CFNB57։ہप೥೥݄ ͞Βʹɺ"OESPJE৽ػೳͷϚϧν΢Οϯυ΢Ͱ΋ࢹௌՄೳʹɻ

ࢹௌ໘ͷύλʔϯ͕ෳࡶԽʜ

#"/%8*%5) QMBZMJTU@MJWFNV &959ʜ #"/%8*%5) QMBZMJTU@MJWFNV &959ʜ #"/%8*%5) QMBZMJTU@MJWFNV NV Q NV Q Q 'VMM)% Y

#"/%8*%5) QMBZMJTU@MJWFNV &959ʜ #"/%8*%5) QMBZMJTU@MJWFNV &959ʜ #"/%8*%5) QMBZMJTU@MJWFNV NV Q NV Q Y Q 'VMM)% Y

#"/%8*%5) QMBZMJTU@MJWFNV &959ʜ #"/%8*%5) QMBZMJTU@MJWFNV &959ʜ #"/%8*%5) QMBZMJTU@MJWFNV NV Q NV Q Y Q 'VMM)% Y , ໿ഒͷ௨৴ྔʜ

#"/%8*%5) QMBZMJTU@MJWFNV &959ʜ #"/%8*%5) QMBZMJTU@MJWFNV &959ʜ #"/%8*%5) QMBZMJTU@MJWFNV NV Q NV Q Y Q 'VMM)% Y Q )% Y

"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ ͍͔ͭ͘ͷ৚݅Λ૊Έ߹ΘͤͯϏοτϨʔτΛಈతʹมߋ͍ͯ͠Δɻ ը࣭ઃఆ ௨৴ճઢ ը໘෯ ࣗಈ ࠷ߴը࣭ ߴը࣭ ʜ 8*'*
.PCJMF ʜ 8JOEPX෯ 7JFX෯ ʜ 04WFS YPSIJHIFS Y ʜ

public class VideoBitrateAdjuster { private final VideoBitrateTable auto = new
AutoBitrateTable(); private final VideoBitrateTable legacy = new LegacyBitrateTable(); private final VideoBitrateTable manual = new ManualBitrateTable(); public VideoBitrate adjust(@Px int w, VideoQuality quality, NetworkState network) { if (quality == AUTO) { if (isLegacyPlatform()) { return legacy.lookup(w, quality, network); } else { return auto.lookup(w, quality, network); } } else { return manual.lookup(w, quality, network); } } "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ ˞αϯϓϧίʔυͰ͢

"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ public class LimitedBandwidthMeter implements BandwidthMeter { ... public setMaxBitrate(long
bitrate) { ... } public long getBitrateEstimate() { return Math.min(bitrateEstimate, maxBitrate); } ... } package com.google.android.exoplayer2.upstream; public interface BandwidthMeter { long getBitrateEstimate(); } ˞αϯϓϧίʔυͰ͢

"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer NV UT

"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 8*'* QY NV UT

"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 8*'* QY Q NV
UT

"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 8*'* QY Q CQT
NV UT

NBY#JUSBUFQ NV UT

NBY#JUSBUFQ NV UT Q

NBY#JUSBUFQ NV UT Q Q

"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 .0#*-& QY Q CQT
NBY#JUSBUFQ NV UT Q Q

͢΂ͯ͸௨৴ྔΛ཈͑ΔͨΊ

·ͱΊ

·ͱΊ wϓϨΠϦετऔಘ͠ա͗໰୊ ࠷৽ͷ&YP1MBZFSʢSʣΛར༻͢Ε͹ղফͰ͖Δɻ wը໘ʹ࠷దͳϏοτϨʔτ੍ޚ ଳҬ্ݶΛઃఆ͢Δ͜ͱͰແବͳ௨৴ྔΛ཈͑Δ͜ͱ͕Ͱ͖Δɻ

͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ɻ

8F`SFIJSJOH IUUQTBCFNBHO[SBT

AbemaTVを支えるアプリの優しさ / abematv_devcon_2017

AbemaTVを支えるアプリの優しさ / abematv_devcon_2017

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