Upgrade to Pro — share decks privately, control downloads, hide ads and more …
Sign up for free

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

Sponsored · Ship Features Fearlessly Turn features on and off without deploys. Used by thousands of Ruby developers. →
Avatar for Masaki Ogata Masaki Ogata
October 21, 2017
Technology
6.9k
3

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。

Avatar for Masaki Ogata

Masaki Ogata

October 21, 2017

More Decks by Masaki Ogata

See All by Masaki Ogata
Jetpack Composeで始めるServer Cache State
Avatar for Masaki Ogata ogaclejapan
2
330
Architecture Components - Lifecycle library
Avatar for Masaki Ogata ogaclejapan
3
2.9k
How to keep data between orientation changes
Avatar for Masaki Ogata ogaclejapan
7
2.7k
Your app name
Avatar for Masaki Ogata ogaclejapan
1
3k
Flux de Relax :)
Avatar for Masaki Ogata ogaclejapan
13
62k
Dagger2 has been released!
Avatar for Masaki Ogata ogaclejapan
3
3.4k

Other Decks in Technology

See All in Technology
【データ横丁主催】AI Agentがコンテキストを使って仕事をした後、何が残るのか― 組織の経験を次の判断に引き継ぐ「Agent Memory」
Avatar for KoheiOgawa shisyu_gaku
2
330
予測不能な実行エージェントを安全にサクッと試せるサンドボックス環境の話
Avatar for SansanTech sansantech
PRO
0
130
組み立てて楽しむ AWS Blocks 入門
Avatar for たけのこ kmiya84377
0
220
IR Today: Theory, Practice, and Agents
Avatar for Daniel Tunkelang dtunkelang
0
350
メルペイ 会計システム概要と歴史
Avatar for mewuto mewuto
0
190
検証フェーズはAIの回答を判断するための学習機会
Avatar for Toru_Kubota toru_kubota
2
510
[AWS 秋のクラウドオペレーション祭り 2026]AWS DevOps Agentで変わる リリースと運用対応 ~リリース管理機能と Directed actions のご紹介~
Avatar for Toshihiro Furuno furuton
4
1k
Lambda MicroVMsが分からなすぎたので使い所を1から考えてみた
Avatar for つくぼし tsukuboshi
2
420
Kernel testing frameworks
Avatar for Kernel Recipes ennael
PRO
0
110
[2026 Oracle Technical Deep Dive] エンタープライズAIエージェントを支えるOCIソリューション。ラインナップと特徴を理解しよう！ (2026年9月17日開催)
Avatar for oracle4engineer oracle4engineer
PRO
0
550
オブザーバビリティを高める AI エージェント体験を考える / Designing AI Agent Experiences That Enhance Observability
Avatar for Kento Kimura aoto
PRO
2
310
Google Cloud Next Tokyo 26登壇時のスクリプト
Avatar for Recruit recruitengineers
PRO
0
200

Featured

See All Featured
Principles of Awesome APIs and How to Build Them.
Avatar for Keavy McMinn keavy
128
18k
The Pragmatic Product Professional
Avatar for Laura Van Doore lauravandoore
37
7.5k
ReactJS: Keep Simple. Everything can be a component!
Avatar for Pedro Nauck pedronauck
666
130k
A Guide to Academic Writing Using Generative AI - A Workshop
Avatar for Kenji Saito ks91
PRO
1
510
The untapped power of vector embeddings
Avatar for Frank van Dijk frankvandijk
2
1.9k
Refactoring Trust on Your Teams (GOTO; Chicago 2020)
Avatar for Rebecca Miller-Webster rmw
35
3.8k
The World Runs on Bad Software
Avatar for Brandon Keepers bkeepers
PRO
72
12k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
Avatar for Joe Casabona jcasabona
35
2.9k
How To Stay Up To Date on Web Technology
Avatar for Chris Coyier chriscoyier
790
250k
What the history of the web can teach us about the future of AI
Avatar for Ines Montani inesmontani
PRO
1
720
Winning Ecommerce Organic Search in an AI Era - #searchnstuff2025
Avatar for Aleyda Solis aleyda
2
2.2k
The Power of CSS Pseudo Elements
Avatar for Geoffrey Crofte geoffreycrofte
82
6.6k

Transcript

  1. "CFNB57Λࢧ͑Δ ΞϓϦͷ༏͠͞

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

  3. ༏͠͞ͱ͸ʁ

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

  5.  lࢥ͍΍Γ͕͋ͬͯ਌੾z  ग़య.BDࣙॻΞϓϦεʔύʔେࣙྛ

  6. ΞϓϦͷ༏͠͞ͱ͸

  7. ωοτϫʔΫ௨৴Λ͍ͩ͡ʹ ΞϓϦͷͤ͘͞ΜGPS6TFS όοςϦʔΛ͔ͭ͏ͳ ΨϯΨϯ͍͜͏ͥ Ξχϝʔγϣϯͤ͞Ζ

  8. 6*ʗ69Λ͍ͩ͡ʹ ΞϓϦͷͤ͘͞ΜGPS4ZTUFN ωοτϫʔΫଳҬΛ࢖͏ͳ Ωϟογϡ͠Α͏ͥ ௿ίετͰӡ༻ͤ͞Ζ

  9.  lωοτϫʔΫ௨৴ྔΛ཈͑Δz  "CFNB57ΞϓϦͷ༏͠͞

  10. "CFNB57Λࢧ͑Δ ΞϓϦͷ༏͠͞  ʙ"OESPJEΞϓϦͷऔΓ૊Έʙ

  11. ͕ɺɺ

  12. ݄๭೔ɻ ⚡࣌ؒੜ์ૹಛ൪ܾఆ⚡

  13. ෛՙରࡦΛਐΊͨ݁Ռɺ

  14. ༏͠͞ʹෆඋ͕͋Γ·ͨ͠

  15. "CFNB57Λࢧ͑Δ ΞϓϦͷ༏͠͞

  16. "CFNB57Λࢧ͑Δ ΞϓϦͷ༏͠͞ XJUI

  17. ϓϨΠϦετऔಘ͠ա͗໰୊

  18. )-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

  19. )-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

  20. )-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

  21. )-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

  22. )-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

  23. )-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

  24. )-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

  25. )-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

  26. )-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

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

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

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

  30.  ŧŖƃ

  31. ݁࿦ɺ&YP1MBZFSͷෆ۩߹Ͱͨ͠ɻɻ IUUQTHJUIVCDPNHPPHMF &YP1MBZFSQVMM

  32. 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

  33. ͜ΕͰ໰୊ղফ

  34. ը໘ʹ࠷దͳϏοτϨʔτ੍ޚ

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

  36. "CFNB57։ہप೥೥݄ ΞϓϦ͸ैདྷͷԣը໘ʹՃ͑ɺॎը໘Ͱͷࢹௌʹ΋ରԠɻ

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

  38. ࢹௌ໘ͷύλʔϯ͕ෳࡶԽʜ

  39. )-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

  40. )-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

  41. )-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

  42. )-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

  43. )-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

  44. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ ͍͔ͭ͘ͷ৚݅Λ૊Έ߹ΘͤͯϏοτϨʔτΛಈతʹมߋ͍ͯ͠Δɻ ը࣭ઃఆ ௨৴ճઢ ը໘෯ ࣗಈ ࠷ߴը࣭ ߴը࣭ ʜ 8*'*

    .PCJMF ʜ 8JOEPX෯ 7JFX෯ ʜ 04WFS YPSIJHIFS Y ʜ

  45. 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

  46. "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

  47. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer NV UT

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

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

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

    UT

  51. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 8*'* QY Q CQT

    NV UT

  52. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 8*'* QY Q CQT

    NBY#JUSBUFQ NV UT

  53. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 8*'* QY Q CQT

    NBY#JUSBUFQ NV UT

  54. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 8*'* QY Q CQT

    NBY#JUSBUFQ NV UT

  55. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 8*'* QY Q CQT

    NBY#JUSBUFQ NV UT Q

  56. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 8*'* QY Q CQT

    NBY#JUSBUFQ NV UT Q Q

  57. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 .0#*-& QY Q CQT

    NBY#JUSBUFQ NV UT Q Q

  58. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 .0#*-& QY Q CQT

    NBY#JUSBUFQ NV UT Q Q

  59. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 .0#*-& QY Q CQT

    NBY#JUSBUFQ NV UT Q Q

  60. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 .0#*-& QY Q CQT

    NBY#JUSBUFQ NV UT Q Q

  61. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 .0#*-& QY Q CQT

    NBY#JUSBUFQ NV UT Q Q

  62. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 .0#*-& QY Q CQT

    NBY#JUSBUFQ NV UT Q Q

  63. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 .0#*-& QY Q CQT

    NBY#JUSBUFQ NV UT Q Q

  64. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 .0#*-& QY Q CQT

    NBY#JUSBUFQ NV UT Q Q

  65. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ VideoBitrateAdjuster PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer "650 .0#*-& QY Q CQT

    NBY#JUSBUFQ NV UT Q Q

  66. ͢΂ͯ͸௨৴ྔΛ཈͑ΔͨΊ

  67. ·ͱΊ

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

  69. ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ɻ

  70. 8F`SFIJSJOH IUUQTBCFNBHO[SBT