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The live WebSocket pushed every frame on a wall-clock schedule regardless of whether the client could keep up. On a slow device frames piled into the client decode queue, and the client paid the inflate+delta-patch cost for each one before dropping the excess in its render loop. CPU spent on frames never shown. Client now reports its decoded-frame backlog (frameBuffer depth) ~4x/sec over the existing command channel. When the backlog exceeds BACKLOG_HIGH the server skips frames: it advances the source cheaply (grab, no decode/encode/send) so video stays time-aligned with audio, and crucially holds prev_frame across the gap so the next sent frame is a correct delta against the last SENT frame. No keyframe resync needed - deltas are always relative to the last sent frame. MAX_CONSEC_DROPS caps the gap and guarantees liveness for slow/non-reporting clients. Fully backward compatible: a client that never reports keeps backlog=0 and behaviour is unchanged. test/test_backpressure_gap.js encodes a keyframe + a dropped gap via codec.py and decodes through the shipped codec.js, asserting the post-gap frame is reconstructed bit-exact (and is a real DELTA), matching the no-drop path. |
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| .. | ||
| _gap_fixture.py | ||
| test_backpressure_gap.js | ||
| test_e2e.js | ||
| test_scrub.py | ||
| test_ytdl.py | ||
| test_ytdl_hardening.py | ||
| test_ytdl_normalize.py | ||