[Ffmpeg-devel] AAC decoder

[Benjamin Larsson]

Rich Felker wrote:

>On Tue, Mar 21, 2006 at 10:05:44PM +0000, Benjamin Larsson wrote:
>  
>
>>Mike Melanson wrote:
>>
>>    
>>
>>>Mike Melanson wrote:
>>>
>>>      
>>>
>>>>    One question: Is it really necessary to include tables for sine
>>>>and KBD values? I know the sine table can easily be generated at
>>>>runtime. The same probably applies for the KBD values.
>>>>        
>>>>
>>>    I decided to put my code where my mouth is. What follows is a
>>>program to generate the sine tables, and also validates them against
>>>the tables in your aac.h file. This will eliminate the hard-coding of
>>>sine_long_1024[] and sine_short_128[]. I will see if I can figure out
>>>an algorithm for the KBD stuff as well.
>>>
>>>      
>>>
>>One algo is in liba52. It's an iterative bessel thingy :)
>>    
>>
>
>Have you RTFM'd libm? IIRC it includes functions to compute this for
>you.. :)
>
>Rich
>  
>
man libm
No manual entry for libm

MvH
Benjamin Larsson

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