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プロトコルを使って複数サービスを跨いだmusic playerを実装する
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Hiroki Kumamoto
September 02, 2018
2
470
プロトコルを使って複数サービスを跨いだmusic playerを実装する
Hiroki Kumamoto
September 02, 2018
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Transcript
ϓϩτίϧΛͬͯෳαʔ ϏεΛލ͍ͩmusic playerΛ ࣮͢Δ iOSDC 2018/09/02 Hiroki Kumamoto a.k.a kumabook
ࣗݾհ • Hiroki Kumamoto • a.k.a kumabook (twitter, github) •
Software engineer at Spincoaster, Inc. • swift, JavaScript, ruby, rust ...
ϦΞϧ ͳ Իָγʔϯͱ ग़ ѭ͏ M U S I C
C H A R T T OP 10 0
TYPICA • ԻָϙʔλϧΞϓϦ • @TYPICA_JP • Web: typica.mu • iOSΞϓϦ
• ʰϦΞϧͳԻָγʔϯͷՄࢹԽʱΛࢦͨ͠ԻָαʔϏε • Web্ͷԻָใΛΫϩʔϧͯ͠Ϩίϝϯυ • Իָʹؔ͢ΔهࣄԻָαʔϏεͷۂɺΞϧόϜɺϓϨΠϦετ • TYPICA Top 100 (https://typica.mu/ja/chart/top100) • ಠࣗͷϥϯΩϯάγεςϜ
ΞϓϦϓϨʔϠ • AppleMusic, Spotify, YouTube, SoundCloudʹର Ԡͨ͠ԻָϓϨʔϠ • αʔϏεؒΛލ͍Ͱ࿈ଓ࠶ੜՄೳ •
ԻָϓϨʔϠ։ൃͷࡍʹ࡞ͬͨϥΠϒϥϦɾಘ ͨݟʹ͍ͭͯͷ
None
Apple MusicSpotifyͳͲ ͷΑ͏ͳഭΓ্͕ΔϓϨʔϠ
YouTubeSpotifyͷۂ͕ ࠞࡏ͍ͯͯ͠ ಉ͡࿈ଓ࠶ੜ͕Մೳ ↑ ϝΠϯͷ͓
Agenda • iOSͰԻָΛ࠶ੜ͢Δํ๏ͷհ • ෳαʔϏεʹ·͕ͨͬͯ࠶ੜ͠Α͏ͱ͢Δͱ ग़ͯ͘Δ՝ • ࡞ͬͨϥΠϒϥϦʹ͍ͭͯ
iOSͰԻָΛ࠶ੜ͢Δ • AVFoundation.AVPlayer • MediaPlayer.MPMusicPlayerController • WebView • Spotify iOS
SDK • ϨΠϠͷAPIΛ͏ (ࠓճείʔϓ֎) • CoreAudio, AudioUnit, OpenAL …
AVFoundation.AV(Queue)Player • URLͰԻಈըϑΝΠϧΛࢦఆͯ͠࠶ੜ͢Δ • ಈըͷ߹viewͷlayerʹplayerΛηοτͯ͠ ө૾Λදࣔ • ࢀߟ: ಈըΞϓϦΛͳΊΒ͔ʹಈ͔ٕ͢ज़
MediaPlayer.MPMusicPlayerController • iTunesϥΠϒϥϦ or AppleMusic ͷۂΛ࠶ੜ • applicationMusicPlayer: ΞϓϦʹดͨ͡ϓ ϨʔϠ
• systemMusicPlayer: MusicΞϓϦΛૢ࡞
AppleMusicΛ࠶ੜ͢Δ • ϢʔβͷAppleMusicΞΧϯτͱଓ • AppleMusic APIͬͯۂͷIDΛऔಘ • MPMusicPlayerController#setQueue(with: descriptor) •
MPMusicPlayerController#play()
AppleMusicΞΧϯτଓͷखॱ 1. Info.plist ʹNSAppleMusicUsageDescriptionΛՃ 2. SKCloudServiceController.authorizationStatusͰݱࡏͷঢ়ଶΛ֬ ೝ 3. SKCloudServiceController.requestAuthorizationͰଓཁٻ 4.
SKCloudServiceController#requestCapabilities Ͱ࠶ੜՄೳ͔ΛνΣοΫ 5. SKCloudServiceController#requestStorefrontCountryCodeͰ StorefrontΛऔಘ
Apple Music API • AppleMusicͷใΛऔಘ͢ΔͨΊͷWebAPI • αʔόͰར༻Մೳ • StorefrontΛࢦఆ •
݁Ռͷݴޠ͕มΘΔ • ̎छྨͷtoken • developer token • user token
• Ϣʔβʹඥ͔ͮͳ͍σʔλ • ྫɿۂɾϓϨΠϦετΛݕࡧ • JSON Web Token (JWT) •
࠷6ϲ݄༗ޮͳͷΛੜՄೳ developer token
developer tokenͷੜ • https://developer.apple.com/ -> Certificates, Identifiers & Profiles •
Identities -> Music IDͷ࡞ • Keys -> MusicKit private key ͷ࡞ • JWTͷੜ • elauimagineering/apple-music-token-generator • key idɾteam idɾprivate key • ΫϥΠΞϯτʹprivate keyຒΊࠐ·ͳ͍ํ͕ྑ͍
• ϢʔβσʔλΞΫηεͰ͖Δ • ྫɿۙͷ࠶ੜཤྺɺϓϨΠϦετ࡞ɾۂ ΛՃ • MPMediaLibraryͰϓϨΠϦετ࡞ͳͲՄ ೳ • requestUserToken(forDeveloperToken:completion
Handler:) user token
Apple Music Client • Web APIͳͷͰެࣜͷΫϥΠΞϯτͳ͍ • Apple Music APIͷJSON݁ߏบ͕͋Δ
• Φεεϝɿscottrhoyt/Cider
WebView • UIWebView(WKWebView) Ͱ࠶ੜ • <video playsinline /> + UIWebView#allowsInlineMediaPlayback
• શը໘ʹͳΒͳ͘ͳΔ • iOS10͔ΒsafariͰ
WebView: YouTube࠶ੜ • youtube/youtube-ios-player-helper • ެࣜͷYouTubeͷWebView wrapperϓϨΠϠʔ • YTPlayerView: JavaScriptͳ͠ʹૢ࡞Մೳ
• نͰ͜ΕҎ֎ͷ࠶ੜํ๏ΛೝΊ͍ͯͳ͍ • ඇެࣜͳ࠶ੜํ๏…
Spotify iOS SDK • spotify/ios-sdk • SpotifyͷۂΛ࠶ੜͰ͖Δ • ϓϨϛΞϜΞΧϯτͳΒ࠶ੜͰ͖Δ͕ɺ ҰൠΞΧϯτͩͱࢼௌ͔͠Ͱ͖ͳ͍
• AppleMusicಉ༷
Spotify iOS SDK • Spotify accountͰOAuth ϩάΠϯ • SPTAudioStreamingControllerʹaccess tokenΛ
ηοτ • ࠶ੜ͢ΔTrackͷuriΛWeb APIͳͲͰऔಘ • SPTAudioStreamingController#playSpotifyURI
SpotifyͷOAuthೝূ • oauthೝূʹtoken refresh༻ͷαʔόΛཱͯΔඞཁ͕͋Δ • https://developer.spotify.com/documentation/ios-sdk/guides/ token-swap-and-refresh/ • refresh͠ͳ͍ͱ̍࣌ؒͰࣦޮ •
̎ͭͷྫ • railsͰͷ࣮ྫ • AWS lambda+API GatewayͰͷ࣮ྫ: kumabook/spotify- token-swap-lambda
όοΫάϥϯυ࠶ੜ • Capabilities -> Background Modes -> Audio ,... ʹνΣοΫ
• AVAudioSession#setCategory() • AVAudioSessionCategoryPlayback
ίϯτϩʔϧηϯλʔ • ίϯτϩʔϥ͔ΒͷΠϕϯτ • MPRemoteCommandCenter • playCommand.addTarget • ίϯτϩʔϥͷදࣔ •
MPNowPlayingInfoCenter#nowPlayingInfo
αʔϏεؒΛލ͍ͩϓϨʔϠΛ࣮ ͠Α͏ͱͨ࣌͠ʹग़͖ͯͨ՝
αʔϏεͱϓϨʔϠʔ • SoundCloud • YouTube • Spotify • AppleMusic ←
AVPlayer ← WebView ← spotify/ios-sdk ← MediaPlayer
AVPlayer YouTubePlayer SpotifyPlayer AppleMusicPlayer ̐ͭͷϓϨʔϠΛཧ + ͦΕͧΕPlayer UIͱ࿈ܞ
Πϕϯτͷ௨APIόϥόϥ • εςʔλε௨Πϕϯτ • ݱࡏͷ࠶ੜҐஔͷ௨Πϕϯτ
εςʔλε௨Πϕϯτ AVPlayer NotificationCenter + KVO YTPlayerView YTPlayerViewDelegate MPMusicPlayerController NotificationCenter SPTAudioStreamingController
SPTAudioStreamingPlaybackDelegate
ݱࡏͷ࠶ੜҐஔͷ௨Πϕϯτ AVPlayer AVPlayer#addPeriodicTimeObserver YTPlayerView YTPlayerViewDelegate MPMusicPlayerController ͳ͍ʁ(ࣗલλΠϚʔ) SPTAudioStreamingController SPTAudioStreamingPlaybackDelegate
ঢ়ଶཧ • ࠶ੜഉଞత • ϓϨʔϠΛࢭΊ͔ͯΒ࣍ͷϓϨʔϠΛ࠶ੜ • Ωϡʔͷཧʴ࣌ؒͷཧ • ผͷϓϨʔϠΛ࠶ੜͯͬͨ͠ͱ͖ʹલͷۂ ͕࠶ੜ͞Εͳ͍Α͏ʹঢ়ଶΛΫϦΞ
ϥΠϒϥϦԽ • kumabook/PlayerKit • Example • APIࠩΛٵऩͯ͠γϯϓϧͳIFΛఏڙ • ෦తʹPlayerΛҰ୴protocolͰදݱͯ͠ɺ αʔϏεؒͷΓସ͑Λڞ௨࣮
• Player UI
PlayerKit.QueuePlayer AVPlayer YouTubePlayer SpotifyPlayer AppleMusic Player
QueuePlayer Player AVPlayer YouTubePlayer SpotifyPlayer AppleMusicPlayer QueuePlayerObserver Playlist
Player protocol • ୯ҰͷτϥοΫΛ࠶ੜ͢ΔϓϨʔϠͷϓϩτίϧ • ϝϦοτɿίʔυ͕γϯϓϧʹ • σϝϦοτ: ͦΕͧΕͷϓϨʔϠ͕͍࣋ͬͯΔʮ࣍ͷۂͷϓϦϩʔυػೳʯ ͳͲ͕͑ͳ͘ͳΔ
init load loadTo Play play pause play(_: Track) prepare(_: Track)
[complete loading] [complete loading] pause() play() [end to play] Playerͷঢ়ଶભҠ: PlayerState
Player • var state: PlayerState { get } • func
clearPlayer() : Πϕϯτࢹͷղ์ɺλΠ ϚʔͷΫϦΞ • func preparePlayer(): ΠϕϯτࢹɺλΠϚʔε λʔτɺঢ়ଶΛॳظঢ়ଶ
MPMusicPlayerControllerͷόʔ δϣϯ͝ͱͷڍಈͷࠩҟ • iOS11 ͔Βۂͷ࠶ੜ͕ऴΘͬͯ MPMusicPlayerControllerNowPlayingItemDidChan ge Πϕϯτ͕ඈΜͰ͜ͳ͘ͳͬͨ • →ۂͷऴྃΛײͰ͖ͳ͘ͳͬͨ
• issues/12 • ࣗಈͰ࣍ͷۂʹߦ͔ͳ͘ͳͬͯ͠·ͬͨͷͰସ ҊΛࡧத
QueuePlayer • PlaylistͷதͷTrackΛ֘͢ΔPlayerʹσΟεύον ͍ͯ͘͠ • Track#playerType Ͱผ • Playerͷ෦ͷ࣮ʹґଘ͠ͳ͍ •
ݸʑͷPlayerΛಈతʹՃ͢Δ • queuePlayer.addPlayer(YouTubePlayer())
init load loadTo Play play pause play(_: Track) prepare(_: Track)
[complete loading] [complete loading] pause() play() [end (queue is empty)] QueuePlayerͷঢ়ଶભҠ next() previous() [end]
ࢼௌͱࢹௌ • SpotifyɾAppleMusic༗ྉձһͰͳ͍ͱ֎෦Ξ ϓϦͰ࠶ੜͰ͖ͳ͍ • ࢼௌͷURL • AppleMusic: Song previews[].url
• Spotify: Track preview_url
ࢼௌͱࢹௌΛΓସ͑Δ • ಉ͡TrackͰϢʔβͷঢ়ଶʹΑͬͯ͏Player ͕ಈతʹม͑Δඞཁ͕͋Δ • Ϣʔβͷঢ়ଶཧΞϓϦͷ • Track#playerTypeͷฦ͢Λಈతʹ
public var playerType: PlayerType { If SpotifyAPIClient.isPremiumUser { return .spotify
} return .avPlayer }
• AppleMusicSpotifyͷΑ͏ͳഭΓ্͕ΔϓϨʔ Ϡʔ • ࢀߟ: 8/31ͷηογϣϯ MusicΞϓϦͷ TransitionΛ࠶ݱ͢Δ • ࡉ੍͔͍ޚ͕͔ͨͬͨͨ͠Ί
UIPresentationControllerΘͣࣗલͰ࣮ Player UIͷ࣮
YTPlayerViewͷΓସ͑ τϥϯδγϣϯ͕ऴΘͬͨ࣌ʹ YTPlayerViewΛҠಈͤͯ͞ϦαΠζ
·ͱΊ • iOSͰԻָΛ࠶ੜ͢Δํ๏ͷհ • ෳͷϓϨʔϠʔΛΈ߹Θͤ͏ͨΊͷϥΠϒϥ ϦΛ࡞ • ΠϯλϑΣʔεͱঢ়ଶભҠΛఆ͓͔ٛͨ͛͠Ͱϓ ϨʔϠಉ࢜ΛΓସ͑Δ෦ڞ௨ԽͰ͖ͨ •
MPMusicPlayerControllerͷΠϕϯτAPIपΓʹ՝ ͋Γ
͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠
ࢀߟϦϯΫ • AVFoundation.AVQueuePlayer • MediaPlayer.MPMusicPlayerController • youtube/youtube-ios-player-helper • spotify/ios-sdk
ࢀߟϦϯΫ • Introducing MusicKit