Re: Parameters in Offline AUs and Reducing the length of AudioFiles
Re: Parameters in Offline AUs and Reducing the length of AudioFiles
- Subject: Re: Parameters in Offline AUs and Reducing the length of AudioFiles
- From: William Stewart <email@hidden>
- Date: Thu, 15 Jul 2004 17:24:19 -0700
On 15/07/2004, at 3:35 AM, Asher Vander Heiden wrote:
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Hello,
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>
I've spent a long time studying the documentation on these 2 issues
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and I feel I have come to a dead end on both of them.
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>
1. Can an Offline AudioUnit contain parameters?
Yes - its an AU (very similar to an effect but with additional
semantics about how it wants input and how it delivers output (inc.
preroll functionality))
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If so, then I gather that this is done differently to how it is done
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in a normal AudioUnit. I followed how to setup parameters for an AU
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based on the documentation and the 'SampleEffectAU'. I found that
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problems started to occur because the 'SampleEffectAU' includes
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"AUEffectBase.h" while the Offline AU includes "AUBase.h" instead.
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Does this mean that Offline Units are not mean to have parameters?
No - its exactly the same.. the reason it subclasses AUBase is that it
deals differently with input and output of render.
Bill
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2. How can you reduce the length (duration) of an AudioFile?
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>
Due to factors that I wont go into, after processing my AudioFiles
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end up with a period of silence at the end of the file. I would really
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like to know if there is a way of chopping off these unwanted zeros? I
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have actually managed to extract the data from an AudioFile and placed
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it into a buffer. I have removed the zeros and have places the data
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into a new buffer and into a new AudioFile. I set the new AudioFile
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with the reduced number of bytes and fames and it seemed to have
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worked ! Until I went to open the file and it tells me the file has an
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incorrect duration?
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I would greatly appreciate it if anyone could give me any ideas to
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solve these problems.
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I've been pouring over documentation and I am still stuck.....
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>
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Asher Vander Heiden.
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>
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