[Speex-dev] Regarding mismatch in data rates of speex codec

[Jean-Marc Valin]

T Murali Mohan wrote:
> Accoring to the Table.8.1 and Table.8.2 of  speex manual (Version 1.2
> Beta 2), the
> data rates supported by speex codec for narrowband are *3.95, 5,95 ,8
> ,11 ,15 ,18.2 and 24.6kbps*.
>  
> But when I run the code(downloaded from www.speex.org
> <http://www.speex.org>), I am getting data rates of
> *4,6,8,11.2,15,2,18.4 and 24.8 kbps.*
> ** 
> That is, for an input of 20ms frame  the number of output bits I am
> getting are *80,120,160,224,304,368 and 496* whereas
> the number of bits given in the Table.8.1 are   *79, 119, 160, 220, 300,
> 364 and  492 .*
> ** 
> Can anybody help me in finding out the reason behind this mismatch.

Easy. Most of the time when you're encoding, the number of bits gets
rounded up to the next full byte. However, if you were to pack 8 frames
in a packet, you'd see the same values as the manual has.

	Jean-Marc