Re: Streaming Audio - AudioFileStream, CFReadStreamRead and AudioQueue

Subject: Re: Streaming Audio - AudioFileStream, CFReadStreamRead and AudioQueue
From: Alexander Saal <email@hidden>
Date: Thu, 19 Nov 2009 22:44:02 +0100

Hi Adam Fox,

> Yay I have finally figured this out. What a relief :) If anyone needs

> help getting the same thing working you can contact me :)

> ps. Sorry Jens for mailing you personally I believed I was replying to

> the mailing list..

Thanks for your help.

Now my question:

It is possible to get the associated audio unit output device from the current running Audio Queue? If it's possible, how I can connect a equalizer to this?

Like that:

AudioComponentDescription cd;

memset(&cd,0,sizeof(AudioComponentDescription));

cd.componentFlags = 0;

cd.componentFlagsMask = 0;

cd.componentManufacturer = kAudioUnitManufacturer_Apple;

cd.componentType=kAudioUnitType_Effect;

cd.componentSubType=kAudioUnitSubType_GraphicEQ;

.....

AudioUnitParameterValue auParam = 0;

error = AudioUnitGetParameter( equalizerAudioUnit, kGraphicEQParam_NumberOfBands, kAudioUnitScope_Global, 0, &auParam );

// auParam: 0 => 10 Band equalizer

// auParam: 1 => 31 Band equalizer (default?)

error = AudioUnitSetParameter( equalizerAudioUnit, kGraphicEQParam_NumberOfBands, kAudioUnitScope_Global, 0, 1, 0 ); // Set 31-bands eq....

I need that for changing dB on each frequencies.

Thanks in advance

Alexander S.

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