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c : coreaudio-api@lists.apple.com 17 January 2006 • 3:00AM -0500

Re: play file in reverse
by William Stewart

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No, it isn't - I can't say that we ever really considered such a  
feature either to be honest.

Bill

On 14/01/2006, at 6:06 PM, thomas rettich wrote:

> when playing a sound file I want to be able to instantly play it  
> backwards (e.g. upon a button pressed). just like the effect when  
> you're playing a piece of vinyl and rewind it manually.
> so basically what I'm trying to do is to simulate a record player.
> I assume it is not possible to do this with the fileplayer AU (?)
>
> thomas
>
>
>> From: Jeff Szuhay <jeffszuhay@mac....>
>> To: thomas rettich <thomas.rettich@hotm...>
>> CC: coreaudio-api@list...
>> Subject: Re: play file in reverse
>> Date: Sat, 14 Jan 2006 12:26:05 -0500
>>
>>
>> On Jan 13, 2006, at 3:05 PM, thomas rettich wrote:
>>> when I am using the AUfileplayer audio unit to play files is  
>>> there  a way to play an audio file in reverse. I couldn't figure  
>>> out how  to do it with this particular audio unit.
>>> if not what would be an alternative to do so.... there's is an  
>>> offline unit in the examples folder that reverts the samples in  
>>> a  file but I need to do it in real time. any hints would be great.
>>
>> Please define what you mean by "real time."
>>
>> When there is a file, there is a known beginning and a known end.
>> But if you are doing it in "real time," I'm assuming you want to take
>> some chunk of sound and reversing it.
>>
>> But this is not really reversing it.
>>
>> To wit.
>>
>> Forward  file:   abcdefgh
>> Reversed file:  hgfedcba
>>
>> chunked and
>> reversed (by 2): badcfegh
>>
>> Note that these reversed sequences are not even close.
>>
>> Which is a long winded way of saying: more definition please!
>>
>
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