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tylerjenningsw
e519f21f45
The start held the first frame until `ahead.min(fit)` frames were cached, which could never happen in two cases, holding it for ever: - the prefetch requests offsets 0..min(ahead * 3, fit - 1) from the playhead, one frame fewer than that when the RAM preview limits it, and with the playhead held nothing else requested the last one; - `fit` counts comp-sized frames, but Extended Viewer frames render larger, so fewer of them fit in the budget than it needs at once. It now waits for startup_frames(ahead, window, budget, frame bytes): ahead, no more than the prefetch window requests, and no more than fit in the budget at the size the first frame really rendered at, at least the current frame. Tests: startup_frames unit cases (a 4-frame budget needs 3; a 160×120 comp's 320×248 Extended Viewer frames need 2); ui_audio_scrub starts from a cold cache with budgets of 2, 3, 4, ahead - 1, ahead and ahead + 1 frames, with and without a device, and with Extended Viewer frames larger than the comp: each leaves its startup, from frame 0 (both hold the first frame for ever on the previous commit). Also: a device whose start fails plays the picture; a device that consumes the sound moves the picture on and a stall still stops it; the 30 s preview starts without caching the whole work area; Stop after a step of preparation never opens the output.