Hi Park,
3A framework code on OMAP chipsets is proprietary and is shared as libraries and so you cannot have access to the source code.
To know the details of the IIR filter on OMAP chipsets, you can refer to the OMAP3630 TRM.
OMAP 3630 TRM: <URL:http://focus.ti.com/pdfs/wtbu/OMAP36xx_ES1.x_PUBLIC_TRM_vQ.zip>
Thanks & Best Regards,
Venkat
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