Re: iPhone microphone level metering using kAudioUnitType_Mixer?
Re: iPhone microphone level metering using kAudioUnitType_Mixer?
- Subject: Re: iPhone microphone level metering using kAudioUnitType_Mixer?
- From: Shaun Guth <email@hidden>
- Date: Mon, 10 Jan 2011 19:21:05 -0800
I'm going to rest on this today and pick it up tomorrow, but conceptually what I'm trying to achieve is:
1) Data from microphone is provided to a callback function somewhere (so I can analyze it)
2) At the same time, I am able to update a label with the current meter level
The audio likely won't "go" anywhere (though maybe eventually I'd like to write it to a file or something).
Right now, I have a 2-node graph (IO unit, mixer unit) -- I have an input callback attached to my IO unit which is getting called, and I can see data in that callback.
The IO unit bus 1 output is connected to the mixer unit bus 0 input, and that's all.
I just tried connecting the output of the mixer to the output bus on the IO node (to speaker), and this did not seem to improve things -- but, I also did not hear my mic input on the speaker, as I was expecting.
I _was_ able to make this work with Audio Queues -- however, I have a desire to use the VoiceProcessing IO Unit, so I'm trying to do this using Audio Units.
-- Shaun
On Mon, Jan 10, 2011 at 6:45 PM, Aran Mulholland
<email@hidden> wrote:
Are you getting audio data through? Does your graph have an output at the other end, is there anything "pulling" the data?
On Tue, Jan 11, 2011 at 12:07 PM, Shaun Guth
<email@hidden> wrote:
I would have loved that to be a *facepalm* moment for me, but alas:
osStatus = AudioUnitSetProperty(mMixerUnit, kAudioUnitProperty_MeteringMode, kAudioUnitScope_Input, 0, &trueValue, sizeof(UInt32));
-- Shaun
On Mon, Jan 10, 2011 at 5:02 PM, Aran Mulholland
<email@hidden> wrote:
have you turned on the metering?
On Tue, Jan 11, 2011 at 11:44 AM, Shaun Guth
<email@hidden> wrote:
I might just be really tired...
Is it possible to use the Mixer Audio Unit to meter the input level from the iPhone microphone? I have an AUGraph that initializes properly:
AudioUnitGraph 0x7626000:
Member Nodes:
node 1: 'auou' 'vpio' 'appl', instance 0x5604040 O
node 2: 'aumx' 'mcmx' 'appl', instance 0x5606450 O
Connections:
node 1 bus 1 => node 2 bus 0 [ 1 ch, 8000 Hz, 'lpcm' (0x0000000C) 16-bit little-endian signed integer]
I'm trying to meter the input level from the microphone by connecting my I/O unit to the mixer unit and then querying kMultiChannelMixerParam_PreAveragePower
As it's running though, I'm only getting values of -120.0 -- this is on the iPhone simulator. I do have a mic hooked up, and I see that it's receiving input in the system preferences.
-- Shaun
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