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AudioSuite: Vari-Fi slows a clip down to a stop or speeds it up from one - #1016
AudioSuite ▸ Pitch Shift ▸ Vari-Fi resamples the clip at a constant speed (docs/plugin-parity.md lists "varispeed effect" as a gap). The Vari-Fi chapter of Avid's Audio Plug-Ins Guide describes a speed ramp: Slow Down and Speed Up, "similar to a tape recorder or record turntable" slowing down to or speeding up from "a complete stop"; Fit To, which processes two thirds of the selection so the result keeps its length; Extend, which renders 150 % of the selection from the same start; and Fades On or Off: https://web.archive.org/web/20260809112153/https://resources.avid.com/SupportFiles/PT/Audio_Plug-Ins_Guide_2023.9.pdf (Chapter 29).
This changes what the Vari-Fi menu item does: it now opens the speed ramp instead of the constant-speed Speed slider. The varispeed process stays available to audiosuite.process.
offline::vari_fi: reads the audio with the speed at 1 - u² for Slow Down and 1 - (1 - u)² for Speed Up, where u runs from 0 to 1 over the result. Both curves average 2/3 of normal speed, which gives the guide's two thirds and 150 %. Fit To plays the first two thirds for Speed Up and the last two thirds for Slow Down, as the guide's Extend section implies. With fades, the gain follows the speed. At either end of the input, the interpolation reads the first or last sample, so the level holds at the stop with Fades Off.
audiosuite.process: the new vari_fi process takes change (0 Slow Down, 1 Speed Up), selection (0 Fit To, 1 Extend) and fades (1 On, 0 Off). A clip whose result would not fit in one offline render is refused, as the other AudioSuite processes refuse it.
AudioSuite window: Change, Selection and Fades rows of radio buttons. The defaults are Slow Down, Fit To and Fades On.
docs/plugin-parity.md and ROADMAP.md describe it.
The guide does not give the speed curve, the fade shape or the defaults; those are SoundCraft's own.
New tests, each failing on main:
vari_fi_fit_to_keeps_the_length_and_plays_two_thirds (dsp): checks the read position along the ramp, normal speed at one end and a near stop at the other.
vari_fi_extend_plays_everything_over_150_percent (dsp): the length, the read positions, and the same positions on both channels.
vari_fi_fades_follow_the_speed (dsp): the fade-out and fade-in gains, and the level with Fades Off, also at the stop at either end of the input.
vari_fi_pitch_falls_as_the_tape_slows (dsp): a 1 kHz sine keeps its pitch at the start and plays at three quarters of it halfway through.
vari_fi_handles_empty_and_uneven_channels (dsp): empty input and channels of different lengths; a shorter channel is silent past its end.
vari_fi_ramps_the_speed_and_extend_lengthens_the_clip (engine): the clip keeps its start, Fit To keeps its length and Extend makes it 150 % long.
vari_fi_refuses_mono_clips_longer_than_one_render (engine): Fit To and Extend refuse a mono clip whose result is longer than one offline render.
vari_fi_menu_opens_the_speed_ramp_and_its_choices_reach_the_engine (ui-egui): the menu item opens vari_fi, the window's defaults match the engine's, and each choice changes the render.
offline_survives_random_args also calls vari_fi.
Checks:
cargo test -p soundcraft-dsp: 38 + 63 tests passed
cargo clippy -p soundcraft-dsp --all-targets -- -D warnings: no warnings
cargo fmt --all -- --check: clean
cargo xtask assets and cargo xtask layers: ok
On Windows 11 (x86-64) with rustc 1.99.0, at 3e56738 on top of main at aa74bff, merged with #998, #1017 and #1018 for failures that also occur on main on Windows:
cargo xtask ci passes its 7 steps: 1,278 tests passed, 0 failed, 1 ignored.
git merge-tree reports no conflicts with main at aa74bff. With #1013 (Auto Pan), the code merges cleanly, and ROADMAP.md and docs/plugin-parity.md conflict because each pull request changes the same header line and adds a row at the top of the same progress log and revision tables.
Summary by CodeRabbit
New Features
Added Vari-Fi speed ramps that slow a clip to a stop or speed it up from one.
Choose to fit the effect to the clip’s original length or extend the clip to 150% of its length.
Fades can be turned on or off. By default, Vari-Fi slows down, fits the original length, and applies fades.
Vari-Fi is available in the AudioSuite menu under Pitch Shift.
AudioSuite > Pitch Shift > Vari-Fi resampled the clip at a constant
speed. It now ramps the speed between normal and a complete stop, so
the pitch falls or rises with it. Slow Down and Speed Up set the
direction. Fit To keeps the clip's length and plays two thirds of it;
Extend plays all of it and makes the clip 150 % long. Fades On fades
the audio out with the slowdown or in with the speedup.
The ramp is offline::vari_fi, run by audiosuite.process as vari_fi
with change, selection and fades params. The constant-speed varispeed
process stays available to commands.
Reviewing files that changed from the base of the PR and between 02b1537 and 3e56738.
Files selected for processing: 3
ROADMAP.md
crates/dsp/src/offline.rs
crates/dsp/tests/it/vari_fi.rs
Files skipped from review as they are similar to previous changes: 1
ROADMAP.md
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Walkthrough
The change adds a DSP processor for Vari-Fi speed ramps and exposes it through the AudioSuite command and UI. It supports slowdown or speedup, Fit To or Extend selection, and optional fades. Tests cover processing behavior, command limits, and UI options.
Changes: Vari-Fi AudioSuite processing
Layer / File(s)
Summary
DSP processor and ramp behavior crates/dsp/src/offline.rs, crates/dsp/tests/it/*
Adds Vari-Fi direction and selection types and a processor that samples audio along a speed ramp. Tests cover ramp positions, output lengths, fades, pitch, channel alignment, and edge cases.
Adds Vari-Fi parameter parsing and dispatch. Extend mode uses a 1.5× factor for the input-length limit. Tests cover command output and refusal of oversized clips.
UI and feature records crates/ui-egui/src/dialogs.rs, crates/ui-egui/src/menus.rs, ROADMAP.md, docs/plugin-parity.md
Adds Vari-Fi options to the AudioSuite dialog and maps the menu entry to vari_fi. Updates the roadmap and plugin-parity record with feature details.
sequenceDiagram
participant User
participant AudioSuiteDialog
participant audiosuite_process
participant offline_vari_fi
User->>AudioSuiteDialog: Select change, selection, and fades
AudioSuiteDialog->>audiosuite_process: Submit process parameters
audiosuite_process->>offline_vari_fi: Dispatch audio and derived options
offline_vari_fi-->>audiosuite_process: Return processed audio
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Suggested reviewers:aiongg
Merge Risk: Minimal · up to 3e567
The Vari-Fi change is mergeable after normal checks; no outstanding issue was established.
Security architecture risk: Low · up to 3e567
The new effect reuses existing clip-processing authority, render limits and undo behavior. No introduced security vulnerability was established. Remaining uncertainty concerns how command access and interruption recovery are handled outside the inspected processing path.
Retained concerns
No architecture-level concerns identified.
Security review details
Security Blast Radius
inferred — The inspected processing path affects caller-addressable audio clips and generated sources within the current session, potentially across multiple tracks. This is existing AudioSuite mutation authority, not a newly introduced cross-session or cross-service capability. Host-level access to that authority was not established.
Trust Boundaries and Controls
observed — Caller-controlled options select fixed DSP enum branches. Clip length is checked before rendering using both the existing channel-aware render limit and the effect's growth-aware limit. The new processor reads supplied audio buffers and returns new buffers; it introduces no file, network or credential operation in the inspected branch.
Resilience and Maintainability Implications
observed — Repeated commands or duplicate clip IDs can reprocess the same retained clip identity and allocate additional sources. This behavior predates the PR in the generic AudioSuite loop; no new retry guarantee or increased authority was established. Error rollback remains distinct from idempotency.
Pre-merge checks: 4 · 1
Failed checks: 1 warning
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Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 24 functions across 8 files. (1 skipped: …
Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed checks: 4 passed
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Title check
The title clearly and concisely describes the main AudioSuite Vari-Fi speed-ramp change implemented by the pull request.
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Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check
Check skipped because no linked issues were found for this pull request.
Full details: Docstring Coverage
Explanation
Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 24 functions across 8 files. (1 skipped: 1 unsupported.)
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Write docstrings for the functions missing them to satisfy the coverage threshold.
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Merged main at aa74bff (02b1537). ROADMAP.md and docs/plugin-parity.md conflicted with the Ring Modulator and Float32 headroom entries: the header lines keep both changes, and the progress log and revision rows keep both. On Windows, merged with #998, #1017 and #1018, cargo xtask ci passes its 7 steps: 1,278 tests passed, 0 failed, 1 ignored. The branch merges cleanly with main.
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Actionable comments posted: 2
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Inline comments:
Review comments at @crates/dsp/src/offline.rs:
- Line 507: Update the Slow Down ramp calculation at `let t = first + played *
pos` so its endpoint stays at the last valid input sample when fades are
disabled, avoiding sinc reads beyond the input; preserve silence past the end of
shorter channels.
Review comments at @ROADMAP.md:
- Line 125: In the AudioSuite Vari-Fi progress entry, change “two thirds” to
“two-thirds”; leave the rest of the entry unchanged.
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Slow Down reads up to the end of the input as it stops, and Speed Up starts
reading from its first sample. The interpolation dropped the taps past
either end, so with Fades Off a Slow Down faded to silence at the stop and
a Speed Up started about 1.5% low. Those taps now read the first or last
sample; a channel shorter than the others stays silent past its end.
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AudioSuite ▸ Pitch Shift ▸ Vari-Fi resamples the clip at a constant speed (
docs/plugin-parity.mdlists "varispeed effect" as a gap). The Vari-Fi chapter of Avid's Audio Plug-Ins Guide describes a speed ramp: Slow Down and Speed Up, "similar to a tape recorder or record turntable" slowing down to or speeding up from "a complete stop"; Fit To, which processes two thirds of the selection so the result keeps its length; Extend, which renders 150 % of the selection from the same start; and Fades On or Off: https://web.archive.org/web/20260809112153/https://resources.avid.com/SupportFiles/PT/Audio_Plug-Ins_Guide_2023.9.pdf (Chapter 29).This changes what the Vari-Fi menu item does: it now opens the speed ramp instead of the constant-speed Speed slider. The
varispeedprocess stays available toaudiosuite.process.offline::vari_fi: reads the audio with the speed at1 - u²for Slow Down and1 - (1 - u)²for Speed Up, whereuruns from 0 to 1 over the result. Both curves average 2/3 of normal speed, which gives the guide's two thirds and 150 %. Fit To plays the first two thirds for Speed Up and the last two thirds for Slow Down, as the guide's Extend section implies. With fades, the gain follows the speed. At either end of the input, the interpolation reads the first or last sample, so the level holds at the stop with Fades Off.audiosuite.process: the newvari_fiprocess takeschange(0 Slow Down, 1 Speed Up),selection(0 Fit To, 1 Extend) andfades(1 On, 0 Off). A clip whose result would not fit in one offline render is refused, as the other AudioSuite processes refuse it.docs/plugin-parity.mdandROADMAP.mddescribe it.The guide does not give the speed curve, the fade shape or the defaults; those are SoundCraft's own.
New tests, each failing on
main:vari_fi_fit_to_keeps_the_length_and_plays_two_thirds(dsp): checks the read position along the ramp, normal speed at one end and a near stop at the other.vari_fi_extend_plays_everything_over_150_percent(dsp): the length, the read positions, and the same positions on both channels.vari_fi_fades_follow_the_speed(dsp): the fade-out and fade-in gains, and the level with Fades Off, also at the stop at either end of the input.vari_fi_pitch_falls_as_the_tape_slows(dsp): a 1 kHz sine keeps its pitch at the start and plays at three quarters of it halfway through.vari_fi_handles_empty_and_uneven_channels(dsp): empty input and channels of different lengths; a shorter channel is silent past its end.vari_fi_ramps_the_speed_and_extend_lengthens_the_clip(engine): the clip keeps its start, Fit To keeps its length and Extend makes it 150 % long.vari_fi_refuses_mono_clips_longer_than_one_render(engine): Fit To and Extend refuse a mono clip whose result is longer than one offline render.vari_fi_menu_opens_the_speed_ramp_and_its_choices_reach_the_engine(ui-egui): the menu item opensvari_fi, the window's defaults match the engine's, and each choice changes the render.offline_survives_random_argsalso callsvari_fi.Checks:
cargo test -p soundcraft-dsp: 38 + 63 tests passedcargo clippy -p soundcraft-dsp --all-targets -- -D warnings: no warningscargo fmt --all -- --check: cleancargo xtask assetsandcargo xtask layers: okOn Windows 11 (x86-64) with rustc 1.99.0, at
3e56738on top ofmainataa74bff, merged with #998, #1017 and #1018 for failures that also occur onmainon Windows:cargo xtask cipasses its 7 steps: 1,278 tests passed, 0 failed, 1 ignored.git merge-treereports no conflicts withmainataa74bff. With #1013 (Auto Pan), the code merges cleanly, andROADMAP.mdanddocs/plugin-parity.mdconflict because each pull request changes the same header line and adds a row at the top of the same progress log and revision tables.Summary by CodeRabbit