Strumming up a music player with CMP 🤘
summary
Builds a customer-facing player called Groove Box using Compose Multiplatform with a Ktor server streaming MP3s, shared Kotlin code and expect/actual platform adapters. Android uses Media3/ExoPlayer, iOS uses AVFoundation + Skiko, desktop uses a JVM player; coroutines drive position updates and Coin handles DI. Covers compiler/runtime details (K2 front end, synthetic composer params, slot table), hot reload via desktop target, CI tips (cache Kotlin/Native, drop x64, avoid transitive export) and a production deployment featured in a JetBrains case study.
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chapters (9)
- 0:00Introduction
- 1:24Compose Multiplatform internals
- 7:48Setting up project
- 14:09Kotlin & Compose compilers
- 26:49GrooveBox demo
- 34:48Shared vs platform layers
- 36:31Audio player interface
- 41:17Scaling to production
- 46:41Q&A
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