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。

Transcript

1. "CFNB57Λࢧ͑Δ
   ΞϓϦͷ༏͠͞
   

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2. .BTBLJ0HBUB
   "OESPJE&OHJOFFS"CFNB57 *OD
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3. ༏͠͞ͱ͸ʁ
   

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

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5.  lࢥ͍΍Γ͕͋ͬͯ਌੾z
    ग़య.BDࣙॻΞϓϦεʔύʔେࣙྛ
   

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6. ΞϓϦͷ༏͠͞ͱ͸
   

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7. ωοτϫʔΫ௨৴Λ͍ͩ͡ʹ
   ΞϓϦͷͤ͘͞ΜGPS6TFS
   όοςϦʔΛ͔ͭ͏ͳ
   ΨϯΨϯ͍͜͏ͥ
   Ξχϝʔγϣϯͤ͞Ζ
   

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8. 6*ʗ69Λ͍ͩ͡ʹ
   ΞϓϦͷͤ͘͞ΜGPS4ZTUFN
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   Ωϟογϡ͠Α͏ͥ
   ௿ίετͰӡ༻ͤ͞Ζ
   

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9.  lωοτϫʔΫ௨৴ྔΛ཈͑Δz
    "CFNB57ΞϓϦͷ༏͠͞
   

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10. "CFNB57Λࢧ͑Δ
    ΞϓϦͷ༏͠͞
     ʙ"OESPJEΞϓϦͷऔΓ૊Έʙ
    

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11. ͕ɺɺ
    

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12. ݄๭೔ɻ
    ⚡࣌ؒੜ์ૹಛ൪ܾఆ⚡
    

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13. ෛՙରࡦΛਐΊͨ݁Ռɺ
    

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14. ༏͠͞ʹෆඋ͕͋Γ·ͨ͠
    

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15. "CFNB57Λࢧ͑Δ
    ΞϓϦͷ༏͠͞
    

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16. "CFNB57Λࢧ͑Δ
    ΞϓϦͷ༏͠͞
    XJUI
    

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17. ϓϨΠϦετऔಘ͠ա͗໰୊
    

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18. )-4ʢ)551-JWF4USFBNJOHʣ
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19. )-4ʢ)551-JWF4USFBNJOHʣ
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20. )-4ʢ)551-JWF4USFBNJOHʣ
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24. )-4"EBQUJWF4USFBNJOH
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27. ֤σόΠεͷϓϨΠϦετऔಘִؒ
    ϥΠϒ഑৴Ͱ54ϑΝΠϧͷηάϝϯτִ͕ؒඵͷ৔߹ɻ
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28. ֤σόΠεͷϓϨΠϦετऔಘִؒ
    ϥΠϒ഑৴Ͱ54ϑΝΠϧͷηάϝϯτִ͕ؒඵͷ৔߹ɻ
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29. ֤σόΠεͷϓϨΠϦετऔಘִؒ
    ϥΠϒ഑৴Ͱ54ϑΝΠϧͷηάϝϯτִ͕ؒඵͷ৔߹ɻ
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30. 
    ŧŖƃ
    

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31. ݁࿦ɺ&YP1MBZFSͷෆ۩߹Ͱͨ͠ɻɻ
    IUUQTHJUIVCDPNHPPHMF
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32. ߴϏοτϨʔτ΁੾ΓସΘΓޙ΋Q͕औಘ͞Εଓ͚͍ͯͨ
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33. ͜ΕͰ໰୊ղফ
    

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34. ը໘ʹ࠷దͳϏοτϨʔτ੍ޚ
    

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

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

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

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38. ࢹௌ໘ͷύλʔϯ͕ෳࡶԽʜ
    

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39. )-4"EBQUJWF4USFBNJOH
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40. )-4"EBQUJWF4USFBNJOH
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43. )-4"EBQUJWF4USFBNJOH
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44. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ
    ͍͔ͭ͘ͷ৚݅Λ૊Έ߹ΘͤͯϏοτϨʔτΛಈతʹมߋ͍ͯ͠Δɻ
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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
    

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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
    

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

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

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

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

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

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

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53. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ
    VideoBitrateAdjuster
    PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer
    "650
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    QY
    Q
    CQT
    NBY#JUSBUFQ
    NV UT
    

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54. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ
    VideoBitrateAdjuster
    PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer
    "650
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    QY
    Q
    CQT
    NBY#JUSBUFQ
    NV UT
    

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55. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ
    VideoBitrateAdjuster
    PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer
    "650
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    QY
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    NBY#JUSBUFQ
    NV
    UT
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56. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ
    VideoBitrateAdjuster
    PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer
    "650
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    QY
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    NV
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57. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ
    VideoBitrateAdjuster
    PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer
    "650
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58. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ
    VideoBitrateAdjuster
    PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer
    "650
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59. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ
    VideoBitrateAdjuster
    PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer
    "650
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60. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ
    VideoBitrateAdjuster
    PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer
    "650
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61. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ
    VideoBitrateAdjuster
    PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer
    "650
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62. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ
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    PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer
    "650
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63. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ
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    PlayerBitrateChanger LimitedBandwidthMeter ExoPlayer
    "650
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64. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ
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65. "CFNB57ΞϓϦͷϏοτϨʔτ੍ޚʢ"OESPJEʣ
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66. ͢΂ͯ͸௨৴ྔΛ཈͑ΔͨΊ
    

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67. ·ͱΊ
    

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68. ·ͱΊ
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69. ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ɻ
    

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70. 8F`SFIJSJOH
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