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

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"CFNB57Λࢧ͑Δ ΞϓϦͷ༏͠͞

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

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༏͠͞ͱ͸ʁ

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

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lࢥ͍΍Γ͕͋ͬͯ਌੾z ग़య.BDࣙॻΞϓϦεʔύʔେࣙྛ

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ΞϓϦͷ༏͠͞ͱ͸

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ωοτϫʔΫ௨৴Λ͍ͩ͡ʹ ΞϓϦͷͤ͘͞ΜGPS6TFS όοςϦʔΛ͔ͭ͏ͳ ΨϯΨϯ͍͜͏ͥ Ξχϝʔγϣϯͤ͞Ζ

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

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lωοτϫʔΫ௨৴ྔΛ཈͑Δz "CFNB57ΞϓϦͷ༏͠͞

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"CFNB57Λࢧ͑Δ ΞϓϦͷ༏͠͞ ʙ"OESPJEΞϓϦͷऔΓ૊Έʙ

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͕ɺɺ

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݄๭೔ɻ ⚡࣌ؒੜ์ૹಛ൪ܾఆ⚡

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ෛՙରࡦΛਐΊͨ݁Ռɺ

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༏͠͞ʹෆඋ͕͋Γ·ͨ͠

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"CFNB57Λࢧ͑Δ ΞϓϦͷ༏͠͞

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"CFNB57Λࢧ͑Δ ΞϓϦͷ༏͠͞ XJUI

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ϓϨΠϦετऔಘ͠ա͗໰୊

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)-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

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)-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

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)-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 UT

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)-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 UT UT

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)-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 UT UT

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)-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 UT UT UT

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)-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

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

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

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

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ŧŖƃ

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݁࿦ɺ&YP1MBZFSͷෆ۩߹Ͱͨ͠ɻɻ IUUQTHJUIVCDPNHPPHMF &YP1MBZFSQVMM

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ߴϏοτϨʔτ΁੾ΓସΘΓޙ΋Q͕औಘ͞Εଓ͚͍ͯͨ 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 NV Q NV Q

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͜ΕͰ໰୊ղফ

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ը໘ʹ࠷దͳϏοτϨʔτ੍ޚ

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

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"CFNB57։ہप೥೥݄ ΞϓϦ͸ैདྷͷԣը໘ʹՃ͑ɺॎը໘Ͱͷࢹௌʹ΋ରԠɻ

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

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ࢹௌ໘ͷύλʔϯ͕ෳࡶԽʜ

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

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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

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"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

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"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer NV UT

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

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

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

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

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

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

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

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

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