[Flac-dev] En/decoding 32bit Integer Formats

[Josh Coalson]

--- taktik <taktik at renoise.com> wrote:
> 
> On 05.09.2006, at 22:51, Josh Coalson wrote:
> 
> > --- taktik <taktik at renoise.com> wrote:
> >> What exactly is the reason why libFlac and/or the FLAC
> command-line
> >> en/decoder currently doesn't support 32bit integer samples?
> >>
> >> The comment in "FLAC/format.h" -> of
> >> FLAC__REFERENCE_CODEC_MAX_BITS_PER_SAMPLE notes that
> >> the FLAC format supports 32bit, but the reference en/decoders
> >> currently do not. Does
> >> this mean that libFlac or just the commandline tool is limited to
> 24
> >> bit?
> >>
> >> We would love to use FLAC as a total replacement for WAV files in
> our
> >>
> >> product (in exported song
> >> and instrument content), but really need to have 32bit support, as
> >> our internal sample format
> >> is 32 bit.
> >> I already hackily tried to change
> >> FLAC__REFERENCE_CODEC_MAX_BITS_PER_SAMPLE to 32u and ran
> >> some tests using libFlac. All seemed to work well, so this
> limitation
> >> is maybe (no longer?)
> >> needed?
> >
> > if this works for you, then you are lucky!  the missing parts
> > are 32-bit handling in flac itself (parsing PCM samples), and
> > tuning for 32-bit in libFLAC.  otherwise the current libFLAC
> > should handle 32-bit but I don't have any good material to
> > tune against.
> 
> 
> Great.
> 
> Assuming I would send you a patch that integrates the 32bit pcm im/ 
> export in the
> commandline tool, adjust libFlac to handle 32bit int samples, and add
>  
> some test
> for all this: Could this then be integrated into the official
> release?

yes, but I would say hold off until the next release because the
number of changes in src/flac/encode.c since 1.1.2 will make it
hard to patch.

next release should be sometime this month.

Josh


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