Apple

On Dec 3, 2012, at 5:20 AM, Pier <email@hidden> wrote:

Ok doing this : (from Chris Adamson's code)

  AudioStreamBasicDescription effectASBD;

UInt32 asbdSize = sizeof (effectASBD);

memset (&effectASBD, 0, sizeof (effectASBD));

AudioUnitGetProperty(_dynamicsUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0, &effectASBD, &asbdSize);

effectASBD.mSampleRate = 44100.0;

gives

mSampleRate Float64 44100
mFormatID UInt32 1819304813

mFormatFlags UInt32 41
mBytesPerPacket UInt32 4

mFramesPerPacket UInt32 1
mBytesPerFrame UInt32 4

mChannelsPerFrame UInt32 2
mBitsPerChannel UInt32 32

mReserved UInt32 0

which uses more bytes than I need for my purposes.

So the question is - in order to use Apple's AudioUnits, do I absolutely need to conform to these absd parameters?

Thanks.

Pier.

On Mon, Dec 3, 2012 at 5:20 PM, Pier <email@hidden> wrote:

Hi,

I'm trying to link up my mixer -> remoteio -> dynamics processor

Here is my AudioFormat

  // Describe format
  memset( &audioFormat, 0, sizeof(AudioStreamBasicDescription) );

  audioFormat.mSampleRate = 44100.00;

  audioFormat.mFormatID = kAudioFormatLinearPCM;

  audioFormat.mFormatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;

  audioFormat.mFramesPerPacket = 1;

  audioFormat.mChannelsPerFrame = 1;

  audioFormat.mBitsPerChannel = 16;

  audioFormat.mBytesPerPacket = 2;

  audioFormat.mBytesPerFrame = 2;

When I use CAShow it gives me the following.

AudioUnitGraph 0x4725000:
Member Nodes:
node 1: 'auou' 'rioc' 'appl', instance 0x1c5ab3a0 O I
node 2: 'aumx' 'mcmx' 'appl', instance 0x1d07a6d0 O I
node 3: 'aufx' 'dcmp' 'appl', instance 0x1d085330 O I

Connections:
node 2 bus 0 => node 1 bus 0 [ 2 ch, 44100 Hz, 'lpcm' (0x00000C2C) 8.24-bit little-endian signed integer, deinterleaved]

node 1 bus 0 => node 3 bus 0 [ 2 ch, 0 Hz, 'lpcm' (0x00000029) 32-bit little-endian float, deinterleaved]

Why is it that it shows 0Hz, and 32-bit little endian float for the connection between remoteio and dynamicprocessor when I did not specify it?

Trying
  result = AudioUnitSetProperty (
   _dynamicsUnit,

   kAudioUnitProperty_StreamFormat,
   kAudioUnitScope_Input,
0,
   &audioFormat,
   sizeof (audioFormat)

   );

to set the audioFormat to the desired format gives me a error code -10868.

Thanks in advance for your help.

--
Pier.

--
Pier.

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References:
	>How to set my AUDynamicsProcessor's audioformat? (From: Pier <email@hidden>)
	>Re: How to set my AUDynamicsProcessor's audioformat? (From: Pier <email@hidden>)
	>Re: How to set my AUDynamicsProcessor's audioformat? (From: Chris Adamson <email@hidden>)