[raspberry-vi] Re: Welcome new joiners and progress with audio latency
- From: Mobeen Iqbal <mobeeniqbal@xxxxxxxxx>
- To: raspberry-vi@xxxxxxxxxxxxx
- Date: Mon, 06 Jan 2014 13:32:34 +0000
hi mike. this is great news, i can't wait to test out the new image!
many thanks as always for all your hard work. its a shame we don't have
more devs on board to spread the load...
Mo.
On 06/01/2014 12:25, Mike Ray wrote:
> Hello list,
>
> We have a couple more joiners. So welcome to them. Please feel free to
> give us an intro if you haven't posted yet.
>
> The list can often be pretty quiet, with flurries of activity now and again.
>
> Audio latency...
>
> I have made some progress on finding a solution to the audio latency
> problems which plague us on text-to-speech, which in turn affects
> screen-readers etc.
>
> I have spent the last four days, and lots of the dark hours as well,
> getting to grips with pulseaudio.
>
> Up to now we have tried using espeak in it's default form, which uses
> the portaudio system. It is this which is suffering latency problems
> and causing tts to stutter very badly and also to cause a kernel oops at
> regular but random points.
>
> When I re-compile espeak to use pulseaudio instead of portaudio, the
> stuttering is totally gone.
>
> Now I need to test Emacspeak and see if I can get SpeakUp and Emacspeak
> running side-by-side. And it is looking good.
>
> I've been all round the houses with pulseaudio, and like so many things
> I have spent hours trying to understand how it all works and can now
> have it up and running in about ten minutes.
>
> Also, those who have been here for a while and have been following this
> thread will remember there was a problem with the previous version of
> our accessible Arch Linux image not booting on Pi boards equipped with
> 'Hynix' RAM chips.
>
> And the audio problems meant that we had to blacklist the kernel and
> firmware updates. This locked us into kernel and firmware versions
> which were pre-April 2013.
>
> I'm pleased to say that the current image I am working on is totally up
> to date and is using kernel version 3.10.25, which is the latest Pi
> kernel version.
>
> So, in brief:
>
> 1. pulseaudio seems to be solving the tts problems.
> 2. The latest kernel and firmware will mean Hynix boards will boot.
>
> If I can't get Emacspeak to run alongside SpeakUp initially, I will
> release an image with just SpeakUp because I know some are waiting for
> this and are not that bothered about Emacspeak.
>
> Assuming this fixes the kernel oops, I will then go back to Raspbian and
> see if I can get SpeakUp to run on there with no crashes.
>
> I am not sure whether the Foundation's introduction of the 'Newbs' thing
> makes the latest Raspbian even less accessible because I think there is
> another menu to go through to select an operating system.
>
> Mike
>
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