[CELT-dev] Error resilience

Jean-Marc Valin jmvalin at jmvalin.ca
Thu Mar 17 11:11:21 PDT 2011


CELT always puts the most important bits first, so the best is to only  
look for errors in the first N bits. If there is an error in these  
bits, consider the packet lost. If not, continue decoding as usual.  
For mono, N should be in the order of 64 bits, but you may want to  
test by yourself. Note that CELT has some ability to detect errors,  
but it is *very* limited (e.g. at some rates, you may detect only  
1/1000 of corrupted frames).


Riccardo Micci <riccardo.micci at cambridgeconsultants.com> a écrit :

> Hi,
> We're testing CELT (version 0.7.1) error resilience capability. We've used
> already celtdec packet-loss options. Hence we know what to expect in case
> of whole packet loss.
> How does Celt respond to a broken encoded packet? Is it always better to
> discard it and decode the missing frame through decode_lost?
> We have the hardware capability of protecting the frame with multiple
> CRCs. Hence we might have a rough estimation of how many bits are wrong in
> the frame (no error correction though), in case of few corrupted bits, is
> it better to use the current frame for decoding?
> Thanks
> Best Regards
> Riccardo
> Riccardo Micci
> Senior DSP Engineer, Wireless Group
> Cambridge Consultants
> Science Park, Milton Road
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