Re: AudioUnitV3 effect and "maximumFramesToRender"
Re: AudioUnitV3 effect and "maximumFramesToRender"
- Subject: Re: AudioUnitV3 effect and "maximumFramesToRender"
- From: Martin Man <email@hidden>
- Date: Fri, 14 Dec 2018 19:34:12 +0100
From my experience this is the missing block you are asking for, a pity it’s
not a part of the iOS/macOS SDKs
https://github.com/michaeltyson/TPCircularBuffer
<https://github.com/michaeltyson/TPCircularBuffer>
In short, you can’t force macOS or iOS to work at fixed number of frames, be
prepared to handle random numbers not bigger then maxNumberOfFramesPerSlice. It
does happen and will happen to you that you will get asked for a number you
never seen before :)
Ciao,
Martin
> On 14 Dec 2018, at 19:25, Waverly Edwards <email@hidden> wrote:
>
> >> The host determines how many frames are pulled.
>
> How is the “host” defined. I thought the host was defined as my application
> or audio unit.
> It would seem to me, if the host and the system were synonymous, it would be
> more clear to just say “system” instead of host.
>
> >> This can differ for each call.
>
> I can accept it, since your source is not always going to be a multiple of
> the buffer length, so you’re bound to a shortage but that’s the only case
> that comes to mind.
>
> >> This variable is just to tell the host what the maximum number is that can
> >> be processed at a time.
>
> I’m struggling with this idea because I have set the maximum value to 256 and
> the number of frames pulled is 512. If I set the maximum value to 1024 and I
> get 512, I’m not happy at all but that’s understandable based on this
> definition.
>
> Is there an alternative way to make the number of frames pulled a constant
> value?
>
> From: Bram Bos [mailto:email@hidden <mailto:email@hidden>]
> Sent: Friday, December 14, 2018 12:06 PM
> To: email@hidden <mailto:email@hidden>
> Cc: email@hidden <mailto:email@hidden>
> Subject: Re: AudioUnitV3 effect and "maximumFramesToRender"
>
> The host determines how many frames are pulled. This can differ for each
> call. This variable is just to tell the host what the maximum number is that
> can be processed at a time.
>
> On 14 Dec 2018, at 17:48, Waverly Edwards <email@hidden
> <mailto:email@hidden>> wrote:
>
> init(componentDescription: AudioComponentDescription,options:
> AudioComponentInstantiationOptions = [])
>
> I created an AudioUnitV3 effect and I set the variable
> "maximumFramesToRender" within the above method. The effect does work but
> the system overwrites this value with 512 frames, leaving me with no way to
> alter how many frames are pulled.
>
> https://developer.apple.com/documentation/audiotoolbox/auaudiounit/1387654-maximumframestorender
>
> <https://developer.apple.com/documentation/audiotoolbox/auaudiounit/1387654-maximumframestorender>
>
> The documentation states you must be set before resources are allocated and I
> do so in my init. What else must I do in order to change how many frames are
> pulled in a single cycle.
>
> Does anyone have advice on this matter.
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