[FFmpeg-devel] [PATCH 1/5] libavcodec: Implementation of 32 bit fixed point FFT

[Mike Giacomelli]

Hi Zeljko,

I worked a bit on the Rockbox FFT.  We took the FFMPEG one as-is and adapted it for use on simple ARM devices (our goal was ARM7/ARM9).  Perhaps on newer, more deeply pipelined devices it is not as efficient.

One question, how do I interpret the RMSE values?  Is it value/2^31?  So 48.18 would be ~ 25 bits accuracy?  Or am I misunderstanding?


Mike