mcut SDK

mcut SDK / media/src / ConstantSpeed

Interface: ConstantSpeed

Defined in: packages/media/src/time-stretch.ts:21

Pitch-preserving time-stretch for export audio.

Preview already preserves pitch — media elements default preservesPitch = true when playbackRate changes — so without this the export would chipmunk where the preview didn't. Constant-speed clips (linear two-keyframe timeMaps, which is everything setElementSpeed produces, including its split halves) stretch through here; variable ramps keep the per-buffer playbackRate fallback.

Engine: Signalsmith Stretch (WASM, notably higher quality and faster than phase-vocoder/WSOLA approaches), driven through the offline buffer driver in signalsmith-offline.ts — no Web Audio required, so the same path runs on the main thread, in workers, and under Bun tests. Failures reject and the export falls back to per-buffer playbackRate at the call site.

Properties

rate

rate: number;

Defined in: packages/media/src/time-stretch.ts:23

Source ms consumed per output ms.

sourceSpanMs

sourceSpanMs: number;

Defined in: packages/media/src/time-stretch.ts:27

Source ms consumed in total.

sourceStartOffsetMs

sourceStartOffsetMs: number;

Defined in: packages/media/src/time-stretch.ts:25

First source offset (ms relative to trimStart) the map plays.