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snipeTRandClaude Opus 5.5
5b697f8c47
Accept every creation rate listed by the public decoder research in libSceOpusDec and libSceOpusCeltDec, resampling FFmpeg's 48 kHz output. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
1.9 KiB
1.9 KiB
libSceOpusDec technical debt
Functional
- libSceOpusDec uses FFmpeg for mono/stereo signed-16 decoding at the creation rates the research lists: 8000, 12000, 16000, 24000 and 48000 Hz. The six signatures, 640-byte opaque state allocation and byte-count return follow public PS5 decoder research and ProsperoRadio. Console PCM equivalence and error codes are unverified. Other sample rates, packet loss concealment, invalid inputs and termination with live decoders throw. Context identifiers and host decoder state are private registries; the firmware's opaque state layout and error recovery are unknown.
- sceOpusDecDecode (libSceOpusDec) returns exactly the packet's duration, as libopus does. FFmpeg resamples narrowband SILK from 8 kHz and holds back 24 samples of the first narrowband packet after the decoder starts or after a packet of another bandwidth, releasing them with the next packet that is not narrowband. The decoder keeps FFmpeg's output in order and pads the start with silence, so such a packet begins with 24 samples (0.5 ms) of silence and the output after it is 24 samples late; libopus has no such gap
- sceOpusDecDecode (libSceOpusDec, libSceOpusCeltDec) decodes at 48000 Hz and converts to a lower creation rate with FFmpeg's resampler, where libopus decodes at that rate directly. The resampler's filter delay is padded with silence at the start of the stream like the narrowband delay above, so the output is late by that delay and is not sample-identical to libopus; which of the two the console matches is not measured