Re: Parameters with step increase/decrease
Re: Parameters with step increase/decrease
- Subject: Re: Parameters with step increase/decrease
- From: "Kevin Dixon" <email@hidden>
- Date: Tue, 27 Nov 2007 11:17:39 -0500 (EST)
- Importance: Normal
You may have to override AUBase::SetParameter, which has 4 arguments. I
ran into this problem too, but I thought AUEffectBase would be a better
place to start. Globals()->SetParameter... is a convience wrapper to
access the AUBase variant.
-Kevin
> Hi Kevin,
>
> Thanks for your reply. I am trying this by including the function
>
> void BeatTrack::SetParameter(UInt32 paramID, Float32 value)
> {
> if (paramID == 1)
> {
> value = round(value*4)/4;
> }
>
> Globals()->SetParameter(paramID, value);
> }
>
> in my code. It compiles but the parameter still behaves normally. Any
> idea what I am doing wrong?
>
> Thanks,
>
> Adam
>
> On 27 Nov 2007, at 15:53, Kevin Dixon wrote:
>
>> Overriding AUEffectBase::SetParameter should work for you. You can
>> intercept requests to set a parameter's value, and then calculate the
>> nearest value there. Just avoid infinite loops :)
>>
>> -Kevin
>>
>>> Hi Richard,
>>>
>>> Thanks for your reply. This was my approach when using VST plug-ins
>>> but with an AU I cannot see where to put this code. I guess a better
>>> way to phrase my question would be where can I adapt the setting of a
>>> parameter value so that I can make these changes to it. In the VST
>>> SDK I just put the code in the setParameter method for the relevant
>>> parameter. Where would I do it in an audio unit?
>>>
>>> Thanks,
>>>
>>> Adam
>>>
>>> On 27 Nov 2007, at 15:23, Richard Dobson wrote:
>>>
>>>> Adam Stark wrote:
>>>>> Hi,
>>>>> I was wondering if anyone knew how to make a parameter take
>>>>> values between 0 and N with a step size. For example, values
>>>>> between 0 and 2 with a step size of 0.25 so it would only take
>>>>> the values:
>>>>> 0
>>>> ...
>>>>
>>>> ??!!
>>>>
>>>> y = s * (int)(x/s)
>>>>
>>>>
>>>> (is just one of the many ways to do it)
>>>>
>>>> I leave the question of rounding to nearest as an exercise (is the
>>>> range 0 to 2 inclusive?, etc).
>>>>
>>>>
>>>>
>>>> Richard Dobson
>>>>
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>
>
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