Re: Max simultaneous source count with Remote I/O Callback much lower than with OpenAL
Re: Max simultaneous source count with Remote I/O Callback much lower than with OpenAL
- Subject: Re: Max simultaneous source count with Remote I/O Callback much lower than with OpenAL
- From: Michael Tyson <email@hidden>
- Date: Mon, 13 Feb 2012 11:00:42 +0100
| Wow, that's an impressive difference - I wasn't expecting that level of improvement!
Ah, of course, vDSP_vlint looks perfect - good find.
Cheers =) Michael
On 12 Feb 2012, at 15:43, Hari Karam Singh wrote: Many many thanks Michael. You’re subsequent question about convolution actually tipped me off to the Accelerate framework. A preliminary reworking of the callback shows that I can play 20 unpitched sources with only 6% CPU usage instead of 12 taking 100%. Wow! As far as pitch, I think it can be done easily using the interpolation function vDSP_vlint()... I’m trying to keep it in the callback so I can run a limiter algorithm (eg http://www.musicdsp.org/showone.php?id=265) to better handle clipping...something I think you mentioned in your blog post on summing audio. I’ll share my results if I can get it working. Thanks again! Gratefully, Hari Karam Singh
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