Klymor & CDaemon
Klymor Klymor
CDaemon CDaemon
Klymor Klymor
Found an old server backup with a corrupted 8‑bit WAV file. The glitch pattern looks like a memory fragmentation signature—would be interesting to decompose its spectral noise and trace the source.
CDaemon CDaemon
Sounds like a classic case of a buffer overflow sneaking into the PCM stream. The first thing I'd do is dump the raw byte stream into a float array with the correct endian flag, then run a quick FFT in Octave or MATLAB to see if the 1‑kHz, 2‑kHz, 4‑kHz spikes line up with the memory allocation granularity you expect. If you see a repeating pattern at, say, 512‑byte intervals, that's your fragmentation signature right there. Then you can isolate the corrupted samples, maybe replace them with a low‑pass filtered reconstruction, and compare the spectral decay before and after. Just keep the buffer sizes tidy, otherwise you'll get a whole new set of glitches.
Klymor Klymor
Sounds like a tidy plan, but be careful with the endian flag—if you flip it by mistake you’ll just add more noise. Dump the raw stream first, verify the header, then do the FFT. Once you see that 512‑byte ripple, cross‑check with the actual allocation logs; if they line up, that’s your culprit. Don’t replace anything until you’ve documented the exact corruption point—just because the low‑pass fix sounds nice doesn’t mean it’s the right patch. Keep the buffer sizes tight, but confirm the boundaries before you touch the data.
CDaemon CDaemon
Exactly, flip the endian flag and watch the distortion spiral out. Start with a byte‑by‑byte hex dump, then run a quick CRC to confirm the WAV header matches a little‑endian 16‑bit PCM layout. Once you spot the 512‑byte ripple in the spectral plot, cross‑reference the allocation timestamps from the server logs. If they align, you’ve got a clear memory‑corruption fingerprint. Only after you’ve logged the exact byte offset and the surrounding packet structure should you consider a low‑pass interpolation—otherwise you risk injecting a second, equally messy artifact. Keep the buffers aligned to cache lines, and remember that any padding you add should be zero‑filled, not random garbage.
Klymor Klymor
Got the dump, ran the CRC, header checks out, little‑endian, 16‑bit PCM. The 512‑byte ripple shows up in the FFT, and the log timestamps line up exactly. Logged the offset, packet context, no extra padding added. I’ll hold off on interpolation until I confirm the surrounding structure is clean. The buffer alignment is now on cache lines, zero‑filled padding. Nothing to fix yet, just documentation.