Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
AbemaTVを支えるアプリの優しさ / abematv_devcon_2017
Search
Masaki Ogata
October 21, 2017
Technology
3
6.7k
AbemaTVを支えるアプリの優しさ / abematv_devcon_2017
ネットワーク帯域などの限られたシステムリソースを節約するために、Androidアプリで取り組んでいる優しさをいくつか紹介します。
Masaki Ogata
October 21, 2017
Tweet
Share
More Decks by Masaki Ogata
See All by Masaki Ogata
Jetpack Composeで始めるServer Cache State
ogaclejapan
2
250
Architecture Components - Lifecycle library
ogaclejapan
3
2.7k
How to keep data between orientation changes
ogaclejapan
7
2.6k
Your app name
ogaclejapan
1
2.9k
Flux de Relax :)
ogaclejapan
13
61k
Dagger2 has been released!
ogaclejapan
3
3.3k
Other Decks in Technology
See All in Technology
アウトプットから始めるOSSコントリビューション 〜eslint-plugin-vueの場合〜 #vuefes
bengo4com
3
410
RDS の負荷が高い場合に AWS で取りうる具体策 N 連発/a-series-of-specific-countermeasures-available-on-aws-when-rds-is-under-high-load
emiki
7
4.5k
Biz職でもDifyでできる! 「触らないAIワークフロー」を実現する方法
igarashikana
3
2.2k
Azureコストと向き合った、4年半のリアル / Four and a half years of dealing with Azure costs
aeonpeople
1
250
AWS UG Grantでグローバル20名に選出されてre:Inventに行く話と、マルチクラウドセキュリティの教科書を執筆した話 / The Story of Being Selected for the AWS UG Grant to Attending re:Invent, and Writing a Multi-Cloud Security Textbook
yuj1osm
1
130
NLPコロキウム20251022_超効率化への挑戦: LLM 1bit量子化のロードマップ
yumaichikawa
1
190
もう外には出ない。より快適なフルリモート環境を目指して
mottyzzz
13
9.1k
Linux カーネルが支えるコンテナの仕組み / LF Japan Community Days 2025 Osaka
tenforward
1
120
FinOps について (ちょっと) 本気出して考えてみた
skmkzyk
0
200
コンパウンド組織のCRE #cre_meetup
layerx
PRO
1
230
初めてのDatabricks Apps開発
taka_aki
1
240
SQLAlchemy の select(User).where(User.id =="123") を理解してみる/sqlalchemy deep dive
3l4l5
3
250
Featured
See All Featured
Typedesign – Prime Four
hannesfritz
42
2.8k
Intergalactic Javascript Robots from Outer Space
tanoku
272
27k
Optimising Largest Contentful Paint
csswizardry
37
3.5k
Become a Pro
speakerdeck
PRO
29
5.6k
Dealing with People You Can't Stand - Big Design 2015
cassininazir
367
27k
Designing for humans not robots
tammielis
254
26k
Raft: Consensus for Rubyists
vanstee
140
7.2k
How to train your dragon (web standard)
notwaldorf
97
6.3k
GraphQLの誤解/rethinking-graphql
sonatard
73
11k
How to Create Impact in a Changing Tech Landscape [PerfNow 2023]
tammyeverts
55
3k
What's in a price? How to price your products and services
michaelherold
246
12k
Docker and Python
trallard
46
3.6k
Transcript
"CFNB57Λࢧ͑Δ ΞϓϦͷ༏͠͞
.BTBLJ0HBUB "OESPJE&OHJOFFS"CFNB57 *OD IUUQTHJUIVCDPNPHBDMFKBQBO !PHBDMFKBQBO
༏͠͞ͱʁ
Զࢯɿʮ͍ͨͩ·ʔʯ Շࢯɿʮ͓ؼΓʔɺ͝൧࡞ͬͯ͋ΔΑɻʯ ԶࢯɿʢʹҰͷحʜʣ༏͠͞ʂʂ
lࢥ͍Γ͕͋ͬͯz ग़య.BDࣙॻΞϓϦεʔύʔେࣙྛ
ΞϓϦͷ༏͠͞ͱ
ωοτϫʔΫ௨৴Λ͍ͩ͡ʹ ΞϓϦͷͤ͘͞ΜGPS6TFS όοςϦʔΛ͔ͭ͏ͳ ΨϯΨϯ͍͜͏ͥ Ξχϝʔγϣϯͤ͞Ζ
6*ʗ69Λ͍ͩ͡ʹ ΞϓϦͷͤ͘͞ΜGPS4ZTUFN ωοτϫʔΫଳҬΛ͏ͳ Ωϟογϡ͠Α͏ͥ ίετͰӡ༻ͤ͞Ζ
lωοτϫʔΫ௨৴ྔΛ͑Δz "CFNB57ΞϓϦͷ༏͠͞
"CFNB57Λࢧ͑Δ ΞϓϦͷ༏͠͞ ʙ"OESPJEΞϓϦͷऔΓΈʙ
͕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&/$& &95*/' UT &95*/'
UT &95*/' UT
)-4ʢ)551-JWF4USFBNJOHʣ QMBZMJTU@MJWFNV &95.6 &9597&34*0/ &9595"3(&5%63"5*0/ &959.&%*"4&26&/$& &95*/' UT &95*/'
UT &95*/' UT UT
)-4ʢ)551-JWF4USFBNJOHʣ QMBZMJTU@MJWFNV &95.6 &9597&34*0/ &9595"3(&5%63"5*0/ &959.&%*"4&26&/$& &95*/' UT &95*/'
UT &95*/' UT UT UT
)-4ʢ)551-JWF4USFBNJOHʣ QMBZMJTU@MJWFNV &95.6 &9597&34*0/ &9595"3(&5%63"5*0/ &959.&%*"4&26&/$& &95*/' UT &95*/'
UT &95*/' UT UT UT UT
)-4ʢ)551-JWF4USFBNJOHʣ QMBZMJTU@MJWFNV &95.6 &9597&34*0/ &9595"3(&5%63"5*0/ &959.&%*"4&26&/$& &95*/' UT &95*/'
UT &95*/' UT UT UT UT
)-4ʢ)551-JWF4USFBNJOHʣ QMBZMJTU@MJWFNV &95.6 &9597&34*0/ &9595"3(&5%63"5*0/ &959.&%*"4&26&/$& &95*/' UT &95*/'
UT &95*/' UT UT UT UT UT
)-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
)-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 NV Q
)-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 NV Q NV Q
֤σόΠεͷϓϨΠϦετऔಘִؒ ϥΠϒ৴Ͱ54ϑΝΠϧͷηάϝϯτִ͕ؒඵͷ߹ɻ 1$ 8&# J04 "OESPJE
֤σόΠεͷϓϨΠϦετऔಘִؒ ϥΠϒ৴Ͱ54ϑΝΠϧͷηάϝϯτִ͕ؒඵͷ߹ɻ 1$ 8&# J04 "OESPJE ඵִؒ ඵִؒ
֤σόΠεͷϓϨΠϦετऔಘִؒ ϥΠϒ৴Ͱ54ϑΝΠϧͷηάϝϯτִ͕ؒඵͷ߹ɻ 1$ 8&# J04 "OESPJE ඵִؒ ඵִؒ ඵִؒ
ŧŖƃ
݁ɺ&YP1MBZFSͷෆ۩߹Ͱͨ͠ɻɻ IUUQTHJUIVCDPNHPPHMF &YP1MBZFSQVMM
ߴϏοτϨʔτΓସΘΓޙQ͕औಘ͞Εଓ͚͍ͯͨ 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
͜ΕͰղফ
ը໘ʹ࠷దͳϏοτϨʔτ੍ޚ
"CFNB57։ہॳ݄ ΞϓϦԣը໘ݻఆͰࢹௌ໘ͷը໘αΠζύλʔϯͷΈɻ
"CFNB57։ہप݄ ΞϓϦैདྷͷԣը໘ʹՃ͑ɺॎը໘ͰͷࢹௌʹରԠɻ
"CFNB57։ہप݄ ͞Βʹɺ"OESPJE৽ػೳͷϚϧνΟϯυͰࢹௌՄೳʹɻ
ࢹௌ໘ͷύλʔϯ͕ෳࡶԽʜ
)-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 NV Q NV Q
)-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 NV Q NV Q Q 'VMM)% Y
)-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 NV Q NV Q Y Q 'VMM)% Y
)-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 NV Q NV Q Y Q 'VMM)% Y , ഒͷ௨৴ྔʜ
)-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 NV Q NV Q Y Q 'VMM)% Y Q )% Y
"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ ͍͔ͭ͘ͷ݅ΛΈ߹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 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
"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 8*'* QY Q CQT
NBY#JUSBUFQ NV UT
"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 8*'* QY Q CQT
NBY#JUSBUFQ NV UT
"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 8*'* QY Q CQT
NBY#JUSBUFQ NV UT
"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 8*'* QY Q CQT
NBY#JUSBUFQ NV UT Q
"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 8*'* QY Q CQT
NBY#JUSBUFQ NV UT Q Q
"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 .0#*-& QY Q CQT
NBY#JUSBUFQ NV UT Q Q
"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 .0#*-& QY Q CQT
NBY#JUSBUFQ NV UT Q Q
"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 .0#*-& QY Q CQT
NBY#JUSBUFQ NV UT Q Q
"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 .0#*-& QY Q CQT
NBY#JUSBUFQ NV UT Q Q
"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 .0#*-& QY Q CQT
NBY#JUSBUFQ NV UT Q Q
"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 .0#*-& QY Q CQT
NBY#JUSBUFQ NV UT Q Q
"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 .0#*-& QY Q CQT
NBY#JUSBUFQ NV UT Q Q
"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 .0#*-& QY Q CQT
NBY#JUSBUFQ NV UT Q Q
"CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 .0#*-& QY Q CQT
NBY#JUSBUFQ NV UT Q Q
ͯ͢௨৴ྔΛ͑ΔͨΊ
·ͱΊ
·ͱΊ wϓϨΠϦετऔಘ͠ա͗ ࠷৽ͷ&YP1MBZFSʢSʣΛར༻͢ΕղফͰ͖Δɻ wը໘ʹ࠷దͳϏοτϨʔτ੍ޚ ଳҬ্ݶΛઃఆ͢Δ͜ͱͰແବͳ௨৴ྔΛ͑Δ͜ͱ͕Ͱ͖Δɻ
͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ɻ
8F`SFIJSJOH IUUQTBCFNBHO[SBT