78 lines
5.0 KiB
Markdown
78 lines
5.0 KiB
Markdown
# Hardware parity
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> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** trivial (bounces of a bus fed by an aux compensate its latency (#246); previously minor: audio device, rate and buffer choice; ASIO feature) · **Target:** Avid Pro Tools Ultimate 2026.4.1
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A DAW is judged by how it drives audio interfaces, MIDI gear, control surfaces and sync. This is
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SoundCraft's weakest dimension. Ours is measured from `crates/playback` (cpal) and the absence of
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any MIDI-device or control-surface code; Pro Tools' from its documentation and Setup menus.
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**Hardware: ~12 % ready** (estimated). **Performance: ~35 %** (estimated; nothing benchmarked
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against Pro Tools). Remaining ≈ 110–180 h for hardware, 40–70 h for performance.
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Legend: ✅ works · 🟡 partial · ❌ missing.
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## Audio interfaces
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| Feature | Pro Tools (macOS / Windows) | SoundCraft macOS | Windows | Linux | FreeBSD | Web |
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|---|---|---|---|---|---|---|
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| Driver API | Core Audio / ASIO | 🟡 Core Audio via cpal | 🟡 WASAPI shared via cpal; ASIO with the opt-in `asio` build feature (verified with an SSL 2+) | 🟡 ALSA/Pulse via cpal; no JACK | 🟡 cpal (ALSA layer) | 🟡 Web Audio |
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| Choose playback device | ✅ Playback Engine | 🟡 Setup › Playback Engine (not yet verified on macOS) | ✅ Setup › Playback Engine (WASAPI, ASIO) | 🟡 (not yet verified) | 🟡 (not yet verified) | ❌ |
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| Choose input device | ✅ | 🟡 Setup › Playback Engine (not yet verified on macOS) | ✅ (WASAPI, ASIO) | 🟡 (not yet verified) | ❌ no recording | ❌ |
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| Buffer size (32–2048) | ✅ | 🟡 device buffer when the driver allows it (not yet verified); mix in 512-sample blocks | 🟡 device buffer 16–8192 (verified 128 on ASIO, 256 on WASAPI); mix in 512-sample blocks | 🟡 (not yet verified) | 🟡 | ❌ |
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| Duplex stream on one clock | ✅ | ❌ separate input/output streams | ❌ | ❌ | ❌ | ❌ |
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| Hardware I/O mapping (I/O Setup to physical channels) | ✅ | 🟡 multichannel output in order; no per-channel map | 🟡 | 🟡 | 🟡 | ❌ |
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| Low-latency monitoring | ✅ | ❌ (`options.low_latency_monitoring` is a stored flag) | ❌ | ❌ | ❌ | ❌ |
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| Latency reporting and record offset compensation | ✅ | ❌ | ❌ | ❌ | ❌ | ❌ |
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| Sample rate follows the session; resample when it can't | ✅ (switches device) | 🟡 resamples (input pitch bug fixed, #28) | 🟡 | 🟡 | 🟡 | 🟡 |
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| Avid HDX / HD Native DSP, Hybrid Engine DSP mode | ✅ | ❌ (out of reach: Avid hardware) | ❌ | ❌ | ❌ | ❌ |
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| Disk allocation / record to disk | ✅ | ❌ recording into RAM (PR #84) | ❌ | ❌ | ❌ | ❌ |
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## MIDI
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| Feature | Pro Tools | SoundCraft (all platforms) |
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|---|---|---|
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| MIDI input devices (keyboards, pads) | ✅ | ❌ no MIDI device layer at all (`setup.midi_input_devices` stores names) |
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| MIDI output to external gear | ✅ | ❌ |
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| MIDI Thru, input filter | ✅ | ❌ (stored flags only) |
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| MIDI Beat Clock out, MTC generate/chase | ✅ | ❌ |
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| MIDI learn / controller mapping | ✅ (via surfaces and plug-in maps) | ❌ |
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| Virtual MIDI keyboard | ✅ (MIDI Keyboard window) | 🟡 window exists, no live audition path |
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## Control surfaces
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| Feature | Pro Tools | SoundCraft |
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| EUCON (S1/S3/S4/S6, Dock, Control app) | ✅ | ❌ Avid-proprietary SDK; owner decision |
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| HUI | ✅ | ❌ |
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| Mackie Control Universal | ✅ (via HUI emulation and personalities) | ❌ |
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| Generic MIDI controller personalities | ✅ | ❌ |
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## Sync and video hardware
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| Feature | Pro Tools | SoundCraft |
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|---|---|---|
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| LTC / MTC chase, 9-pin machine control | ✅ (Ultimate) | ❌ |
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| Word clock / video reference awareness | ✅ via interface | ❌ |
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| Video output to a second display or video card | ✅ | ❌ (video window only) |
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| Satellite linking of systems | ✅ | ❌ |
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## Performance
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| Feature | Pro Tools | SoundCraft | Evidence |
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| Parallel mixing across cores | ✅ | ✅ | `soundcraft-mix` renders independent strips in parallel (rayon) |
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| Plugin delay compensation | ✅ | ✅ | Bounces of a bus that an aux returns onto are compensated like the main mix (#246). |
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| Disk streaming of long sources | ✅ | ❌ | Whole files decoded into the `SourcePool` |
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| Track count (Ultimate: 2,048 voices) | ✅ | unmeasured | No benchmark exists; add `cargo xtask bench` |
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| Real-time audio thread discipline | ✅ | ✅ | No blocking/allocation in steady state, audio-thread-aware logger |
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| Freeze / commit to save CPU | ✅ | 🟡 | `track.commit` renders; `track.freeze` only sets a flag (no CPU saved) |
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| GPU-accelerated UI | — | ✅ (wgpu/glow via eframe) | llvmpipe X11 issue #107 |
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## Revision history
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| Date | Change | Summary |
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| 2026-10-13 | trivial | bounces of a bus fed by an aux compensate its latency (#246) |
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| 2026-10-12 | minor | Audio device settings: system, output, input, sample rate and buffer size; opt-in ASIO |
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| 2026-10-10 | major | Created: audit of audio interface, MIDI, control-surface, sync and performance support against Pro Tools 2026.4.1 |
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