iOSDC 2017 - Implementing Music Playback on watchOS

https://iosdc.jp/2017/node/1306

Transcript

1. Implementing music playback on watchOS iOSDC Japan 2017 Dada Chen @nalydadad
4. Remote Controller
5. Remote Controller Apple Music
6. Goal To make Apple Watch to play music offline, but not only a remote controller of your iPhone.
7. How to do it ?
8. Transfer Audio file Save the Audio file Play the music How to do it ?
9. What you need to care about ?
10. Supported File format Playing in Background Handling Interrupt Battery Power Consumption What you need to care about ?
11. Transfer file WCSession Monitor transfer process transferFile ( _ : metadata )
12. Transferring... Completion Monitor transferring state. func session(_ session: WCSession, didReceive file: WCSessionFile). WCSession.shared.outstandingFileTransfers
13. It is saved in a temporary path !! func session(_ session: WCSession, didReceive file: WCSessionFile). Saving file
14. Save it to a proper location. func session(_ session: WCSession, didReceive file: WCSessionFile). Saving file
15. Save it to a proper location. func session(_ session: WCSession, didReceive file: WCSessionFile). Saving file 50 MB Each
16. You should save the files to the “ Shared Group Path.” func session(_ session: WCSession, didReceive file: WCSessionFile). Saving file 50 MB Each
17. You should save the files to the “ Shared Group Path.” func session(_ session: WCSession, didReceive file: WCSessionFile). Saving file 50 MB Each Move the files synchronously.
18. Audio APIs for watchOS AVAudioPlayer WKAudioFilePlayer AVAudioEngine
19. Audio APIs for watchOS AVAudioPlayer WKAudioFilePlayer AVAudioEngine Comparison
20. Comparison AVAudioPlayer WKAudioFilePlayer AVAudioEngine Framework AVFoundation WatchKit AVFoundation Version watchOS 3.0+ watchOS 2.0+ watchOS 2.0+ Support [ Bluetooth Headsets ] YES YES YES
21. Playing through Speaker AVAudioPlayer WKAudioFilePlayer AVAudioEngine Framework AVFoundation WatchKit AVFoundation Version watchOS 3.0+ watchOS 2.0+ watchOS 2.0+ Support [ Bluetooth Headsets ] YES YES YES Support [ Speaker ] NO NO YES
22. Now Playing Controller AVAudioPlayer WKAudioFilePlayer AVAudioEngine Framework AVFoundation WatchKit AVFoundation Version watchOS 3.0+ watchOS 2.0+ watchOS 2.0+ Support [ Bluetooth Headsets ] YES YES YES Support [ Speaker ] NO NO YES Support [ Now Playing ] NO YES NO
23. Completion Handler AVAudioPlayer WKAudioFilePlayer AVAudioEngine Framework AVFoundation WatchKit AVFoundation Version watchOS 3.0+ watchOS 2.0+ watchOS 2.0+ Support [ Bluetooth Headsets ] YES YES YES Support [ Speaker ] NO NO YES Support [ Now Playing ] NO YES NO Completion Handler Delegate NO Callback
24. Completion Handler AVAudioPlayer WKAudioFilePlayer AVAudioEngine Framework AVFoundation WatchKit AVFoundation Version watchOS 3.0+ watchOS 2.0+ watchOS 2.0+ Support [ Bluetooth Headsets ] YES YES YES Support [ Speaker ] NO NO YES Support [ Now Playing ] NO YES NO Completion Handler Delegate NO Callback Make your choice.
25. My Choice
26. AVAudioEngine Support watchOS 2.0+ Support Speaker Completion Handler
27. The devil is in the details.
28. What you need to care about ? The devil is in the details.
29. Supported File Format
30. AAC-LC AAC-ELD HE-AAC HE-AACv2 MP3 Opus Supported File Format WWDC 2017 - “What’s new in Core Audio”
31. Playing in background
32. Playing in background Turn on Background Modes. Link against HealthKit framework.
33. Handling Interrupt
34. Handling Interrupt
35. Handling Interrupt Phone call Interrupt Bluetooth Headset Pairing Route Change AVAudioSessionInterruptionNotification AVAudioSessionRouteChangeNotification
36. Battery Power Consumption
37. Activate AVAudioSession Start playing Go into background Pause playing … … App is still running. Battery Power Consumption
38. Activate AVAudioSession Start playing Go into background Pause playing … … App is still running. Battery Power Consumption When to deactivate AVAudioSession?
39. Battery Power Consumption Pause playing Go into background … Deactivate AVAudioSession App is killed.
40. Battery Power Consumption If you want to resume in background? Pause playing Go into background … Deactivate AVAudioSession App is killed.
41. Battery Power Consumption Pause playing Go into background Set a timer … Deactivate AVAudioSession Invalidate timer Resume playing …
43. Transfer file Save file Audio APIs
44. Transfer file Save file Audio APIs File format Background Mode System Interrupt Battery Power
45. Integrated an electronic SIM
46. Thank you