Re: Best practice for checking 64-bit AU support?
Re: Best practice for checking 64-bit AU support?
- Subject: Re: Best practice for checking 64-bit AU support?
- From: Brian Willoughby <email@hidden>
- Date: Wed, 23 Mar 2016 16:27:42 -0700
On Mar 23, 2016, at 2:57 PM, James McCartney <email@hidden> wrote:
> On Mar 7, 2016, at 11:57 AM, Paul Davis <email@hidden> wrote:
>> The app I'm working on is an audio editor. It supports 32 or 64 bit files natively.
>>
>> What format supports 64 bit sample depth? What program creates them?
>
> CAF supports double precision. I just tested that both Audacity and Sound Studio will open double precision CAF files.
I believe that a more important question is:
Which form of 64-bit support is actually useful?
64-bit sample depth, or 64-bit recording length?
There are plenty of real-world examples where 32-bit AIFF and WAV recording lengths are insufficient. Many recording tools (hardware and software) must automatically close an AIFF/WAV and start a new one periodically in order to make a complete recording without running out of time. Mastering those recordings requires extra steps to put the pieces back together seamlessly. Formats like CAF and RIFF64 solve this limitation by allowing longer recordings.
I'm not aware of any real-world problem that is solved by 64-bit sample depth storage in files. Granted, audio plugins commonly use 64-bit processing internally, but they do not require 64-bit execution, nor do they require 64-bit storage.
Brian Willoughby
Sound Consulting
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