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Re: 3D Mixer Bug or User Error?

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Re: 3D Mixer Bug or User Error?

Subject: Re: 3D Mixer Bug or User Error?
From: William Stewart <email@hidden>
Date: Thu, 21 Dec 2006 19:37:18 -0800

Yes - this should match, so I'd characterise this as a bug in the mixer

Thanks

Bill

On 21/12/2006, at 7:40 AM, Chandrasekhar Ramakrishnan wrote:


I stumbled across an inconsistency in the behavior of the 3D Mixer
compared to the Matrix Mixer.

I'm creating an AudioBufferList via AUOutputBL::Allocate, passing in
my max frames per slice as the argument. When I render the Matrix
Mixer, it updates the mDataByteSize in the buffers of the buffer list
to match what would be expected given the inNumberFrames I asked for.

The 3D Mixer, however, does not do this -- it leaves the mDataByteSize
at maxFramesPerSlice * sizeof(float) (for a mono buffer). This
behavior is causing my AudioConverter to complain. It returns an
'insz' error, apparently because of the decrepency between the number
of frames I ask it to convert and the size of the buffer.

The workaround is easy to implement -- I check if my AU is a 3D Mixer
and, if so, I tweak the mDataByteSizes -- but I'd like to know what
the correct behavior of an AU is in general: is it safe to expect them
to return correct mDataByteSizes, or should I always do the correction
myself?

Thanks and Happy Holidays!

- sekhar

--
C. Ramakrishnan        email@hidden
Illposed Software    http://www.illposed.com
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References:  
  >3D Mixer Bug or User Error? (From: Chandrasekhar Ramakrishnan <email@hidden>)




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