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Questions tagged [audiounit]

Audio Units are plug-ins for Apple's CoreAudio framework which generate or process audio streams.

Audio Units (commonly referred to as simply "AU") are plug-ins for Apple's CoreAudio system which are capable of generating or processing audio streams. Although Audio Units were originally created to compete with Steinberg's VST SDK, they have evolved in quite different directions.

Currently Mac OSX and iOS are the only platforms which support the Audio Unit SDK. Both OSX and iOS ship with a number of default Audio Units for basic audio stream operations, though it is possible to write custom Audio Units on both platforms.

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How to stream video capture between devices like video chat in iphone sdk?

Hi i want to make an app which does video calling between iOS devices .I have studied about opentok and idoubs but i want to do it myself from starting. I searched a lot but could not find any solution . I tried to achieve that in a way i think how…
sajwan
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How to Verify AudioUnit Properties of Mixer Unit and iPodEQ Unit

I want to use the AudioGraph to improve the VOIP audio quality. Now, I've merged the AUGraph to process the audio data from remote, connected the nodes: mixer node--> iPodEQ node --> I/O output node. Remote audio is mono. I set the local output to…
devincdai
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iOS: What is an audio unit?

Audio Unit looks like a Core audio concept, but I see that it has many custom configurations, so I'm thinking can I use audio unit's setting on an AVAudioPlayer? but first, what is an audio unit?
CarmeloS
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iOS tone generator

I'm working on a musical app and I would like to generate tones. Off course I did download the http://www.cocoawithlove.com/2010/10/ios-tone-generator-introduction-to.html that seems to be a good start. But I also read the Apple documentation and…
Alexandre
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AudioUnit support in MonoTouch?

Is there any real AudioUnit support in Xamarin/MonoTouch? Some classes are mapped but most of it seems to be missing, so it's impossible to implement AudioUnit mechanics as described here. Or am I missing something? Thanks a lot!
ThomasWeiss
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Memory leak error message from auval tool

I am validating an audio unit in auval (apple's audiounitvalidationtool), it returns: -------------------------------------------------- AU VALIDATION SUCCEEDED. -------------------------------------------------- but I get a leak and I do not…
bzt
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iOS - Recording from RemoteIO AudioUnit

I'm trying to record from remoteIO and here is my callback. I have an issue though... the code never goes into the if (*ioActionFlags == kAudioUnitRenderAction_PostRender) How do I actually stop the recording such that it goes into…
lppier
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RemoteIO: effecting audio produced by app

In a nutshell: Is there a way to capture/manipulate all audio produced by an app using RemoteIO? I can get render callbacks which allow me to send audio to the speaker by hooking into RemoteIO's output bus for the input scope. But my input buffer…
Scrooch
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How can you compile VST 3 or Audio Units with the command line?

I would like to make an audio plugin, as either an Audio Unit or a VST 3. However, compiling plugins under both frameworks seems to be a very heavyweight process for which only XCode or Visual Studio project files are provided as examples. Is there…
Vortico
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IPlugEffect (Audio Unit target) "SysError 0 during open of "resource.h""

I'm running OSX 10.8 and Xcode 3.2.4, i've tried compiling against both 10.5 & 10.6 to no avail. I'm using Oli Larkin's framework for compiling audio plug-ins to each vst, vst3, au & rtas. All are working perfectly apart from compiling to Audio…
mindTree
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How can I get the count of sample from AudioButterList

I get the AudioBufferList from a wav file. (The sample frequency is 44100Hz and the time length is 2 second). However, I can't get a 44100*2=88200 sample. I get a AudioBufferList which contains 512 NumberBuffers. How can I get the sample from the…
yikyCai
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What is the range of values in a sample of type AudioUnitSampleType?

AudioUnitSampleType is a SInt32. When I log it to the console I get readings roughly between -22000 and 22000. Can someone explain what those values represent? How do they describe the wave form? I suppose because they are positive and negative that…
Proud Member
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MusicDeviceMIDIEvent: unknown function on iOS5.1

I am attempting to use MusicSequence to control an instance of AUSampler targeting iOS5.1 The project has references to CoreAudio and AudioToolbox the project compiles and runs, but errors on the call to MusicDeviceMIDIEvent with Bad Access Xcode,…
disappearance
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my iOS app using audio units with an 8000 hertz sample rate returns a distorted voice

I really need help with this issue. I'm developing an iOS application with audio units, the recorded audio needs to at 8bit / 8000 hertz sample rate using alaw format. How ever I'm getting a distorted voice coming out the speaker. I came across…
Simon McLoughlin
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iOS Audio Unit + Speex encoding is distorted

I am working on an iOS project that needs to encode and decode Speex audio using a remoteIO audio unit as input / output. The problem I am having is although speex doesn't print any errors, the audio I get is somewhat recognizable as voice but very…
T.Leavy
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