[Ardour-Users] [Ardour-Dev] libsndfile

[John Emmas]

----- Original Message ----- 
From: "Ralf Mattes" <rm at mh-freiburg.de>
Subject: Re: [Ardour-Dev] libsndfile
>
> I personally use LinuxPPC/32 which definitely is right-endian :-)
>
Thanks Ralf - that definitely eliminates the temporary 'kludge' as being
a viable option..!

John



----- Original Message ----- 
From: "Ralf Mattes" <rm at mh-freiburg.de>
To: <ardour-dev at lists.ardour.org>
Cc: <ardour-users at lists.ardour.org>
Sent: 10 May 2008 19:21
Subject: Re: [Ardour-Dev] libsndfile


> On Sat, 10 May 2008 11:13:45 +0000, John Emmas wrote:
>
>> Hi everyone,
>>
>> I need to do some work to 'harmonize' 24-bit audio between AAF and Ardour
>> (prior to releasing an AAF importer for Ardour).  One problem is that AAF
>> implements a special 24-bit data type (i.e. 3 bytes per sample) whereas
>> libsndfile internalizes 24-bit audio to 32-bit floats.
>>
>> One way that I'm considering is to treat the imported audio as raw data
>> and
>> use libsndfile's 'raw' reading and writing functions.  Because sound
>> files
>> are often 'endian' I need to know whether or not to byte swap the data.
>> libsndfile includes a new SF_COMMAND called SFC_RAW_NEEDS_ENDSWAP
>> to serve this purpose.  Unfortunately, it was only introduced a few
>> months
>> ago and (whilst my copy of Ardour isn't the most recent) I think it's
>> recent
>> enough to see that this new command isn't included in the version of
>> libsndfile that we use in Ardour.
>>
>> A temporary kludge might be
>
> Kludges _never_ are temporary.
>
>> for me to assume that Ardour is only ever
>> run on little-endian platforms but is that a dangerous assumption?  If
>> there's anyone out there running Ardour on a big-endian platform (e.g.
>> some Motorola processors) please speak up now....  :-)
>
> I personally use LinuxPPC/32 which definitely is right-endian :-)
> One of the most frustrating things I learned using these boxes is: Linux
> developers seem forget about the non-Intel platforms (it's also one of the
> most _audible_ things ...).
>
> Cheers, Ralf Mattes
>
>
>> Thanks,
>>
>> John
>
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