3D Mixer Unit in iOS 4
3D Mixer Unit in iOS 4
- Subject: 3D Mixer Unit in iOS 4
- From: Alex Matheu <email@hidden>
- Date: Tue, 29 Nov 2011 15:29:53 -0500
I am having some issues with a 3D Mixer Unit in iOS 4, it plays fine in iOS 5 but creates a high pitched whine in iOS 4. I read that the inputs need to be mono, I tried that but with the same results.
This is my description
AudioStreamBasicDescription dstFormat;
dstFormat.mSampleRate = 44100.00;
dstFormat.mFormatID = kAudioFormatLinearPCM;
dstFormat.mFormatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
dstFormat.mFramesPerPacket = 1;
dstFormat.mChannelsPerFrame = 1;
dstFormat.mBitsPerChannel = 16;
dstFormat.mBytesPerPacket = 2;
dstFormat.mBytesPerFrame = 2;
//the cross fader mixer
crossFaderMixerDescription.componentFlags = 0;
crossFaderMixerDescription.componentFlagsMask = 0;
crossFaderMixerDescription.componentType = kAudioUnitType_Mixer;
crossFaderMixerDescription.componentSubType = kAudioUnitSubType_AU3DMixerEmbedded;
crossFaderMixerDescription.componentManufacturer = kAudioUnitManufacturer_Apple;
err = AUGraphAddNode(graph, &crossFaderMixerDescription, &crossFaderMixerNode);
NSAssert(err == noErr, @"Error creating mixer node.");
//set the crossfader input properties
err = AudioUnitSetProperty(crossFaderMixer,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input,
0,
&audioFormat,
sizeof(audioFormat));
NSAssert(err == noErr, @"Error setting property format 0.");
Thank you,
--
Alex Matheu
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