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v1.0.0 - Initial Release

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@developerakshat12 developerakshat12 released this 20 Aug 15:16
· 21 commits to main since this release
v1.0.0
d76a5e9

SyncItBaby (v1.0.0), a high-performance Android engine designed for real-time, sub-millisecond audio playback synchronization across multiple devices in a local Wi-Fi / Hotspot star topology. (that's what chatgpt wrote I don't claim sub-millisecond but hey it's usable atleast)

Highlights

  • Star-Topology Leader/Peer Sync: Seamless local hotspot audio streaming.
  • RFC 5905 & 2-State Kalman Clock Discipline Engine: Continuous clock offset and drift rate tracking ($\theta, f$) with 8-slot minimum-RTT filtering and popcorn jitter rejection.
  • Native Oboe C++ Audio Engine: Low-latency hardware DAC presentation using lock-free Single-Producer Single-Consumer (SPSC) ring buffers and AAudio MMAP Exclusive Mode.
  • Snapcast Discrete Sample Manipulation: Artifact-free discrete sample insertion/duplication ($+1 / -1$ samples) eliminating DSP timestretch pitch warping.
  • Real-Time Telemetry UI: Jetpack Compose live telemetry monitor displaying phase error ($\mu\text{s}$), frame delta, buffer depth, and drift velocity.

Performance Benchmarks

  • Lock-in Convergence Time: $< 250\text{ms}$ sub-millisecond synchronization.
  • Steady-State Phase Error: $\pm 0.5\text{ms}$ sustained across multi-device playback.
  • Audio Codec: Opus 48kHz stereo stream with dynamic jitter buffering.

Key Fixes & Stability Hardening

  • Compensated for hardware DAC and Android 10+ AudioPlaybackCapture HAL input latency anchors (~15.05ms).
  • Added bounded rolling packet caching with NACK-based loss recovery and late-join handshake deduplication.

Installation & Assets

Download the signed release APK below to test on physical devices:

  • File: app-release.apk (18.06 MB)
  • Supported Android Versions: Android 7.0+ (API 24 to 36)
Assets 3
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