Re: question about AudioUnit render buffer size
Re: question about AudioUnit render buffer size
- Subject: Re: question about AudioUnit render buffer size
- From: James McCartney <email@hidden>
- Date: Fri, 16 Apr 2010 10:30:23 -0700
On Apr 16, 2010, at 10:29 AM, James McCartney wrote:
> Hi Brad,
>
> The API contract only guarantees that it will be less than kAudioUnitProperty_MaximumFramesPerSlice.
"less than or equal to"
> It can vary in size from call to call particularly if you are upstream of an AU such as AUVarispeed.
>
>
> On Apr 16, 2010, at 9:18 AM, Brad Garton wrote:
>
>> Hey list --
>>
>> I'm probably being really dense here: I'd like to determine ahead-of-time the actual size (in frames) of the AudioBuffers used in the AudioUnitRender(). e.g. in this call:
>>
>> AudioUnitRender(rioUnit, ioActionFlags, inTimeStamp, 1, inNumberFrames, ioData);
>>
>> I'd like to know what "inNumberFrames" will be prior to starting the AudioUnit (rioUnit is the RemoteIO AudioUnit I'm using). Doing an
>>
>> AudioSessionGetProperty(kAudioSessionProperty_CurrentHardwareIOBufferDuration, ...)
>>
>> doesn't seem to do the trick, and setting "kAudioSessionProperty_PreferredHardwareIOBufferDuration" won't *guarantee* an actual number, right?
>>
>> In the simulator I'm always seeing 512 frames for these buffers, but on the device it seems to set it sort-of properly, but can I be sure (the "preferred" is bothering me)? I'd like to get the Actual Real Number of frames.
>>
>> brad
>> http://music.columbia.edu/~brad
>>
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