Re: alsa driver data rates

[James Courtier-Dutton <James@superbug.demon.co.uk>]

Brian Furey wrote:
> Hi James,
> Im asking you becuae looking thru the archives you asked a similar 
> question a long time ago.
> 
>  i'm using an open source VoIP application with the
> alsa driver. My card is the onboard intel8x0.
>    My problem is figuring out the patterns I am
> getting with the alsa driver when transmitting
> packets.
> For instance when I use the GSM codec with a packets
> size of 80 msecs and 132 bytes, packets are
> transmitted at alternate intervals of 64/96 msecs.
> When i use G.711 packets of 240 bytes are transmitted
> every 32 msecs with an extra packet every 15 pkts.
> With G.711 it is obvious that 256 bytes are added to driver sending 
> buffer every 32 msecs.However this does not match for GSM because it 
> needs only 132 bytes every 64/96 msecs.
> Can the driver change the amount of data it gets from the soundcard to 
> suit the codec?
> Help appreciated,
> 
> Brian.
> 
> 

Can you point me to a url for the source?
I think I will understand you a bit better if I see the source code.

Cheers
James


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