SoX supporta DSD

[bibo01]

"I added support for reading DSF and DFF files to SoX and figured someone here might find it interesting. The source code is at https://github.com/mansr/sox.

With these additions, converting to PCM is a simple matter of invoking the "rate" filter. I have tested it with DSD64, DSD128, and DSD256 in stereo and multi-channel. The output seems entirely satisfactory to me, though I haven't done any thorough comparisons to other converters." (mansr)

[marcoc1712]

"I added support for reading DSF and DFF files to SoX and figured someone here might find it interesting. The source code is at https://github.com/mansr/sox.

With these additions, converting to PCM is a simple matter of invoking the "rate" filter. I have tested it with DSD64, DSD128, and DSD256 in stereo and multi-channel. The output seems entirely satisfactory to me, though I haven't done any thorough comparisons to other converters." (mansr)

Modificherei il titolo in: Una fork di SOX che supporta DSD. Non è la versione ufficialmente mantenuta.

[UnixMan]

With these additions, converting to PCM is a simple matter of invoking the "rate" filter.

...ottimo. Però servirebbe anche il passaggio inverso, da PCM a DSD.

[bibo01]

I have now added DSF writing support as well as a simple SDM for creating DSD streams. Although it can certainly be improved, it is a reasonable starting point, and the output is listenable, at least to my ears. (mansr)

[UnixMan]

Grande! Ora forse potrebbe essere il caso fare un po' di "lobbying" affinché le patch siano incluse nelle prossime versioni "ufficiali"...

[bibo01]

Qualche informazione ulteriore:

The resulting code is available from https://github.com/mansr/sox with the following features:

- DSF read/write
- DFF read-only
- DSD to PCM conversion using the existing resampler
- PCM to DSD conversion

The DSD encoding supports four settings with increasing quality and decreasing speed: fast, hq, audiophile, goldenear.

[bibo01]

Riporto la risposta dello sviluppatore alla mia domanda su come convertire un DSD64 a DSD256:

Yes. To do that you need to remove the high-frequency noise from the original, resample to 256x rate, and quantise to 1-bit. Like this:

sox in.dsf out.dsf rate -v 88200 gain 6 rate -v 11289600 sdm

The "gain 6" is needed to restore the volume level from the -6dB reference level for DSD/SACD. However, some DSD files (e.g. from dsdfile.com / Opus3) are encoded at a higher (nonstandard) level, and those require a lower gain setting to avoid clipping. You can also omit the "gain" step entirely and simply get a quieter output file.

Note that although the command above will produce valid output, the filters are optimised for DSD64. Using them for higher rates simply raises the frequency where the noise level starts rising without improving anything in the low part of the spectrum. With filters tuned for DSD128 or DSD256, other characteristics would be possible. I simply haven't got around to exploring those options yet.