Mixer unit and input gain ramping on iOS
Mixer unit and input gain ramping on iOS
- Subject: Mixer unit and input gain ramping on iOS
- From: Igor Sutton <email@hidden>
- Date: Wed, 15 May 2013 15:36:05 +0200
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, ¶meterInfo, &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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