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POiOS Audio units reverb stream format issue -10868 kAudioUnitErr_FormatNotSupported
 

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  1. POiOS Audio units reverb stream format issue -10868 kAudioUnitErr_FormatNotSupported
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    <p>I am writing a simple iOS app with Audio Units. I want to add a reverberation effect. So the graph looks like RemoteIO_Input -> Reverb -> RemoveIO_Output. But I am getting an error when trying to set up a stream format for the reverb unit - <code>kAudioUnitErr_FormatNotSupported</code>. That code works fine without using the reverb unit (single remote IO in graph) so other configuration seems fine and I am not providing their code.</p> <p>UPD: iOS 6 is used</p> <p>So questions:</p> <ol> <li><p>Are there restrictions for the allowed formats?</p></li> <li><p>What format params should I use?</p></li> <li><p>Should set the format in any scope of RemoteIO output element?</p></li> </ol> <p>Thanks for attention.</p> <p>CODE: Descriptions:</p> <pre><code>desc.componentType = kAudioUnitType_Output; desc.componentSubType = kAudioUnitSubType_RemoteIO; desc.componentFlags = 0; desc.componentFlagsMask = 0; desc.componentManufacturer = kAudioUnitManufacturer_Apple; descRev.componentType = kAudioUnitType_Effect; descRev.componentSubType = kAudioUnitSubType_Reverb2; descRev.componentFlags = 0; descRev.componentFlagsMask = 0; descRev.componentManufacturer = kAudioUnitManufacturer_Apple; </code></pre> <p>Graph set up</p> <pre><code>NewAUGraph(&amp;graph); AUNode ioNode; AUNode rNode; AUGraphAddNode(graph, &amp;desc, &amp;ioNode); AUGraphAddNode(graph, &amp;descRev, &amp;rNode); AUGraphOpen(graph); AUGraphConnectNodeInput(graph, ioNode, 1, rNode, 0); AUGraphConnectNodeInput(graph, rNode, 0, ioNode, 0); </code></pre> <p>Format description and set up</p> <pre><code> // Describe format audioFormat.mSampleRate = rate;//44100.00; audioFormat.mFormatID = kAudioFormatLinearPCM; audioFormat.mFormatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked; audioFormat.mFramesPerPacket = 1; audioFormat.mChannelsPerFrame = 1; audioFormat.mBitsPerChannel = 16; audioFormat.mBytesPerPacket = 2; audioFormat.mBytesPerFrame = 2; OSStatus err = AudioUnitSetProperty(unit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, kInputBus, &amp;audioFormat, sizeof(audioFormat)); if (noErr != err) { [self showStatus:err]; } err = AudioUnitSetProperty(unitRev, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0, &amp;audioFormat, sizeof(audioFormat)); if (noErr != err) { [self showStatus:err]; } </code></pre>
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