v0.19 design goals

[roderickvd]

This is a tracking issue with design goals for v0.19:

• Migrate to Rust 2024
• Work out extension traits
  • RAW mode on WASAPI (WASAPI: Raw stream mode #1173)
  • NO_CONVERT mode on PipeWire
  • Control panel on ASIO (ASIO: open control panel #1074)
  • Set identifying stream properties on PipeWire (Pipewire: API to set identifying properties #1186)
  • Exclusive mode on CoreAudio, PipeWire & WASAPI (Support Exclusive Mode #106)
  • Force / passthrough mode on PipeWire
• Native DSD on WASAPI
• Normalize stream lifecycle: play/pause → start/pause/stop with draining stop (feat: rename StreamTrait::play to start, add draining stop #1258)
• Software pause on ALSA (feat: rename StreamTrait::play to start, add draining stop #1258)
• Input streams on WASM (Add support for input streams to webaudio host #412, What would it take to make WebAssembly audio inputs happen? #813, In Wasm, Only Output Can be Used ? #868)
• Refactor SupportedConfig types (SupportedStreamConfig(Range) API inconsistencies - can we have a SupportedStreamConfig.try_with_fixed_buffer_size? #956)
  • Consider merging various types (How to handle zero channels in SupportedStreamConfig? #676)
  • Consider distinguishing discrete & continuous sample rates
• Refactor BufferSize with range support (Consider adding a BufferSize::Near variant (alternative to Default and Fixed) #447, Reviewing and deciding upon a default buffer size strategy for ALSA #446, [WASAPI] Using fixed buffer size when the only available output config shows 'Unknown' buffer size ? #534)
• Device across thread boundaries (Send + Sync) (Provide the tools to pass devices (and the rest) around across Send/Sync boundaries #435)
• Duplex stream API (Duplex Stream Support #349, Plan for implementing an ALSA duplex API #628, feat: add duplex stream API (interface only; backends to follow) #1229, feat: duplex support for pipewire #1272)

Target date: when it's done; feature set may change at any time.

[1rhino2]

@roderickvd poking at the v0.19 list from the #981 onboarding.

so far:

• Bug: ASIO modified feedback example no mic input #1287 / fix(asio): share duplex buffer state across Device handles for the same driver #1297: static review posted (ASIO duplex shared AsioStreams). no ASIO hardware here yet for a live A/B.
• feat(WASAPI): allow setting raw stream mode #1195 (WASAPI RAW / WASAPI: Raw stream mode #1173): reviewed. cargo check green on windows. flagged that the PR adds AudioProcessing on StreamConfig while this tracker buckets RAW under extension traits. would love a maintainer call on StreamConfig vs WasapiDeviceExt before that lands.
• HostId enum Refactor #1274 (HostId refactor / HostId enum Refactor #1260): light review posted (supported vs available iterator filter + deprecation/UPGRADING notes).

next windows-shaped thing i can take unless you prefer otherwise: help land whatever API shape you want for #1173, or keep grooming the PR backlog.