Re: ramp parameter of output au
Re: ramp parameter of output au
- Subject: Re: ramp parameter of output au
- From: William Stewart <email@hidden>
- Date: Thu, 5 Jan 2006 16:33:50 -0800
I'd be interested in seeing the crash log (can you file it at
bugreporter.apple.com with some code to reproduce this)
Basically scheduling ramp parameters is a little more complicated
than this - you have to schedule the ramp from the same thread you
render from (ideally, from the pre-render notification). You have to
re-schedule the ramps each render call - so your code progresses
through the ramp (the start buffer offset is how you note the
progression).
Have a look in the AU docs - /Developer/Examples/CoreAudio/
Documentation for more details on how to do this.
Bill
On 05/01/2006, at 3:28 PM, thomas rettich wrote:
hi,
I am using the default output AU and I want to ramp the
kHALOutputParam_Volume from 0.0 to 1.0. and I want this ramp to
last for 100000 frames.
the following code causes a segmentation fault. can anybody tell me
what I am doing wrong:
struct AudioUnitParameterEvent paramEvent;
paramEvent.scope= kAudioUnitScope_Global;
paramEvent.element=0;
paramEvent.parameter= kHALOutputParam_Volume;
paramEvent.eventType=kParameterEvent_Ramped;
paramEvent.eventValues.ramp.startBufferOffset=0;
paramEvent.eventValues.ramp.durationInFrames= 44000;
paramEvent.eventValues.ramp.startValue = 0.0;
paramEvent.eventValues.ramp.endValue= 1.0;
AudioUnitScheduleParameters(
outputAU,
¶mEvent,
0); // i am not sure what value to pass for inNumParamEvents, as
I don't know the buf
// size aufileplayer uses
any help would be highly appreciated,
thanks,
thomas
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