[Speex-dev] About speex_jitterbuf_get

[Steve Kann]

Messagingbay wrote:
> Hi
>
> Who can explain its return values and packets losing relationship during decoding? 
>
> Because the decoder needs to consume one 20ms frame , if there is packages lose , the jitter buffer will be empty. Is it good idea to replace as silence? 
>   
Generally that would be a bad idea;  it would come out sounding like 
packet loss, which is what you're trying to avoid.

The speex coded can perform "packet loss concealment", by estimating 
what the missing frame should sound like;  I think you pass in NULL to 
the decoder to do this.  If you're not using speex as the codec, most 
codecs have similar methods, or if you're using something like uLaw or 
PCM, you can interpolate.

-SteveK