[FFmpeg-devel] dcadata.h: note on LFE FIRs

Alexander E. Patrakov patrakov
Sun Aug 24 17:03:39 CEST 2008


lfe_fir_128[] is a scaled up by a factor of 1.9999958 copy of lfe_fir_64[] 
(but with less significant digits provided in the spec). Surely one wants to 
round this factor to 2.0 (because LFE samples are just 8-bit signed PCM sound 
samples) and use the common table (lfe_fir_64[]) for both cases of LFE 
upsampling. The symmetry of this FIR table relative to its middle point is 
already noted in the FIXME.

No patch yet, because I should not be coding late at night.

Alexander E. Patrakov

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