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Re: Audio data in float format for iOS?
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Re: Audio data in float format for iOS?

  • Subject: Re: Audio data in float format for iOS?
  • From: Gregory Wieber <email@hidden>
  • Date: Mon, 17 Jan 2011 12:29:44 -0800
I'm pretty sure that floating point is native in Thumb 2, so it's worth looking at what processor you're using, yes? (Most of the tutorials out there recommend compiling with thumb off, but that doesn't appear to be a good idea if your device is Armv7, in which case thumb 2 should be enabled.)  

I was avoiding floating point conversions and usage early on,  but now I'm wondering as well if I should be switching to floating point formats for the newer chips -- especially with the availability of the accelerate framework.



On Mon, Jan 17, 2011 at 12:25 PM, morgan packard <email@hidden> wrote:
I'm currently doing all of my synthesis in floating point land (0-1
values) and converting to ints only at the final step, when writing to
the remote io callback. Any guesses as to how much of a performance
hit I'm taking because of this? I'm using the STK library for
envelopes and oscillators, which is float-based.

Sent from my iPhone

On Jan 17, 2011, at 1:17 PM, Aran Mulholland <email@hidden> wrote:

> Im pretty sure (but don't mindbeing corrected) that on the iOS platform the only core audio data type that is supported is just integer. The most efficient format to use is going to be a pure integer one and the next candidate will be a fixed point implementation. Until we get a floating point processor on board.....
>
>
> On Jan 18, 2011, at 1:32 AM, Steve gfx <email@hidden> wrote:
>
>> Thanks, I'll take a look at that.
>>
>>
>> On 17 Jan 2011, at 14:26, tahome izwah wrote:
>>
>>> Stephan Bernsee's Dirac iPhone example comes with an EAFRead class
>>> that converts CA ABLs into float arrays. I found it quite useful and
>>> am (mis)using it frequently ever since I discovered it:
>>>
>>> http://dirac.dspdimension.com
>>>
>>> HTH
>>> --th
>>
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References: 
 >Audio data in float format for iOS? (From: Steve gfx <email@hidden>)
 >Re: Audio data in float format for iOS? (From: tahome izwah <email@hidden>)
 >Re: Audio data in float format for iOS? (From: Steve gfx <email@hidden>)
 >Re: Audio data in float format for iOS? (From: Aran Mulholland <email@hidden>)
 >Re: Audio data in float format for iOS? (From: morgan packard <email@hidden>)

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