50be9578c5
A snapshot of the non-game files as of0148cb8("port: F5/F6 hand-off -- one-minute human checks, and a refutation attempt that survived", 2026-09-04), the tip of auto/port-p6-audio. The branch was deleted from the server on 2026-09-17 during the consolidation cleanup; issue #7 asks for this work as a reviewable PR, so it is recovered here before the commits are garbage collected. Contents: the 84 files the branch changed relative to its fork pointb305aa4, which is this commit's parent. The tree is therefore 0148cb8's tree with the 854 exported game assets left out -- export-probe/, export-probe2/, three .wav renders of game audio and adv-v2-screenlog.tsv. Game data stays out of git; the exporter regenerates those from the disc. docs/port/DECISIONS.md still refers to them by name. Not recovered: the branch's own 366 commits. Keeping them would make those assets reachable again, so this is one snapshot instead. The original commits stay unreferenced in the server's object store, and in this clone under the local branch archive/port-p6-audio, until either is garbage collected. Refs #7. The OPTIONS work that issue #6 asks for is a subset of this branch, also recovered as recover/options-menu. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
68 lines
3.2 KiB
Bash
Executable File
68 lines
3.2 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Remove driver-inserted silence from a capture, exactly.
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#
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# tools/port/strip-padding in.wav out.wav
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#
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# WHEN THIS IS VALID, AND WHEN IT IS VANDALISM. The distinction is the whole
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# tool and getting it backwards destroys the artefact:
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#
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# * PulseAudio's monitor SUBSTITUTES silence. It advances on a wall clock and
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# replaces audio that existed when the producer was late. Information is
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# gone; deleting the holes compresses time unevenly and repairs nothing.
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# DO NOT RUN THIS ON A MONITOR CAPTURE.
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# * Xenia's ALSA writer PADS. It inserts silence between samples the guest
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# emitted when its ring is empty (`alsa_audio_driver.cc:359`). Nothing is
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# lost and nothing is overwritten, so removing the padding is EXACT -- it
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# hands back the contiguous stream the guest produced.
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#
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# CONTROLLED, not argued. A real music+SFX bed (137.37 s, with 454 zero runs of
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# its own) had 1 149 holes inserted at 8.37/s to +9.9 % length, matching the
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# observed ALSA profile, then was stripped:
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#
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# original vs itself r 1.000 lag 0.0 s margin +0.141 [ceiling]
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# PADDED vs original r 0.436 lag -12.2 s margin +0.006 [destroyed]
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# STRIPPED vs original r 1.000 lag 0.0 s margin +0.142 [recovered]
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#
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# Frame counts: original 6 593 984, stripped 6 559 880, and the original stripped
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# of its own genuine zero runs 6 560 044 -- a difference of 164 frames, 3.4 ms in
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# 137 s, from inserted holes abutting genuine ones and merging.
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#
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# ⚠️ It removes GENUINE silence too, and cannot tell the two apart -- that is why
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# the reference above is the unstripped original: recovery does not depend on
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# stripping both sides. On this material the genuine runs total 0.71 s in 137 s
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# and cost nothing measurable. On material that is mostly silence they would.
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set -euo pipefail
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in="${1:?usage: strip-padding IN.wav OUT.wav}"; out="${2:?usage: strip-padding IN.wav OUT.wav}"
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python3 - "$in" "$out" <<'PYEOF'
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import array, struct, sys, wave
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src, dst = sys.argv[1], sys.argv[2]
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w = wave.open(src); ch = w.getnchannels(); rate = w.getframerate()
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if w.getsampwidth() != 2:
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print("strip-padding: 16-bit PCM only (got %d-bit)" % (w.getsampwidth()*8)); raise SystemExit(2)
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n = w.getnframes(); a = array.array('h'); a.frombytes(w.readframes(n)); w.close()
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MIN = max(1, rate // 1000) # a gap is a run, not a sample
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sil = bytearray(n)
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for f in range(n):
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b = f * ch
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if not any(a[b+c] for c in range(ch)): sil[f] = 1
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keep = array.array('h'); f = 0; removed = 0; holes = 0
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while f < n:
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s = f
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if sil[f]:
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while f < n and sil[f]: f += 1
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if f - s < MIN: keep.extend(a[s*ch:f*ch])
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else: removed += f - s; holes += 1
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else:
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while f < n and not sil[f]: f += 1
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keep.extend(a[s*ch:f*ch])
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k = len(keep) // ch
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o = wave.open(dst + ".partial", "wb") # temp name, renamed on completion
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o.setnchannels(ch); o.setsampwidth(2); o.setframerate(rate)
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o.writeframes(keep.tobytes()); o.close()
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import os; os.replace(dst + ".partial", dst)
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print("%s: %d frames (%.3f s) -> %s: %d frames (%.3f s)"
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% (src, n, n/rate, dst, k, k/rate))
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print(" removed %d run(s) totalling %.3f s (%.2f %% of the input)"
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% (holes, removed/rate, 100.0*removed/n))
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PYEOF
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