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Re: Mixer unit and input gain ramping on iOS

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Re: Mixer unit and input gain ramping on iOS

Subject: Re: Mixer unit and input gain ramping on iOS
From: Aran Mulholland <email@hidden>
Date: Thu, 16 May 2013 07:51:49 +1000

I was attempting to do something similar using MidiTracks as per the post here: http://lists.apple.com/archives/coreaudio-api/2011/Dec/msg00035.html

I was unsuccessful (and i never filed that radar either, sorry)

On Wed, May 15, 2013 at 11:36 PM, Igor Sutton <email@hidden> wrote:

Hi all,

I've searched everywhere in the web whether the input gain in iOS' mixer unit can be ramped, but I couldn't find anything useful.

I'm using the following to get the parameter info of my mixer:

---8<---
AudioUnitParameterInfo parameterInfo;
UInt32 s = sizeof(AudioUnitParameterInfo);
OSStatus err = AudioUnitGetProperty(*self->_mixer, kAudioUnitProperty_ParameterInfo, kAudioUnitScope_Input, kMultiChannelMixerParam_Volume, &parameterInfo, &s);
if (err == noErr) {
NSLog(@"name: %@, canRamp: %lu", parameterInfo.cfNameString, parameterInfo.flags & kAudioUnitParameterFlag_CanRamp);
}
else {
NSLog(@"Couldn't get property");
}
---8<---

And this is my mixer audio description:

---8<---
AudioComponentDescription mixerDescription;
mixerDescription.componentType = kAudioUnitType_Mixer;
mixerDescription.componentSubType = kAudioUnitSubType_MultiChannelMixer;
mixerDescription.componentManufacturer = kAudioUnitManufacturer_Apple;
mixerDescription.componentFlags = 0;
mixerDescription.componentFlagsMask = 0;
---8<---

I've also dug WWDC 10, 11 and 12 sessions about Core Audio but couldn't find anything.

Do you have any directions I can follow about it?

Igor.

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References:
	>Mixer unit and input gain ramping on iOS (From: Igor Sutton <email@hidden>)

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