Re: Comparing the responsiveness of espeak and Outloud

[Alastair Irving <alastair.irving@xxxxxxxxxxx>]

Further to the below, I've now got voxin working with speakup via the 
speakup connector.  Stopping speech with it is far more responsive than 
with emacspeak.

I've had a look at the code for both the emacspeak server and the 
speakup connector.  The main difference seems to be that the connector 
uses the snd_pcm_avail_update method to determine how many frames to 
write.  It then doesn't do any checking for underruns.

I don't really understand all the details of what's happening but is it 
possible that this explains the difference in performance?  If so is 
there a reason why the emacspeak server doesn't use the 
snd_pcm_avail_update method?

Alastair

On 20/02/2012 18:35, Alastair Irving wrote:
> Hi
>
> I'm running Arch Linux inside a virtual machine.  I have emacspeak 34.0
> with both the espeak and Outloud servers compiled and working.  Both
> servers work well, the only problem is that the outloud server seems to
> be less responsive than espeak, especially when trying to stop speech.
> It's often the case that when stopping outloud an extra couple of
> sylabuls will be spoken.  I know this doesn't sound like much but if you
> cursor through lines very quickly it can get to be a long way behind.
>
> I did some experimenting by running the outloud server directly,
> queueing some speech with the q command, speaking it with d and stopping
> it with s.  as above there was a very obvious delay in stopping, where
> as with espeak there is not.  Whilst doing this I realised that every
> time I got it to speak something the server printed numerous messages of
> the form
> Underrun!!! (at least ... ms too long)
> (for varying values of ...).
>
> Presumably this shouldn't happen.
>
> I would really appreciate it if someone who understands the workings of
> the server could please tell me if the slow stopping and the underrun
> issues are the same problem or different and if there is anything I can
> do about the slow stopping problem.
>
> Many thanks
>
> Alastair
>
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