[raspberry-vi] eSpeak tts, latency, portaudio and pulseaudio
- From: Mike Ray <mike@xxxxxxxxxxxxxxx>
- To: raspberry-vi@xxxxxxxxxxxxx
- Date: Wed, 01 Jan 2014 00:40:07 +0000
Hello list,
Today I have tried the following experiments to solve the latency issues
with eSpeak tts which is causing stuttering in long spoken segments and
also causing the kernel oops which makes SpeakUp unusable with Arch (and
other distros) later than our 'frozen' Arch image:
1. I tried compiling eSpeak for version 19 of portaudio instead of the
default version 18. Unfortunately this makes no difference to the
stuttering audio.
2. I compiled eSpeak to use pulseaudio.
I have managed to confirm that this DOES solve the stuttering tts, this
command:
dmesg | espeak
Yields a perfect splurge of the boot messages with no stuttering.
Now the problems...
Configuring pulseaudio is proving something of a house of cards. I want
to configure it as a daemon which starts at boot time. This is because
with the lower power of the Pi I think this might be better than
autospawning a server on demand. It is likely to be more responsive
than having a server die after periods of idleness and then restarting
again.
But at the moment I can't get the daemon to start.
This is likely not to be the only issue. If I get pulse to run I fully
expect to have to do some juggling to get SpeakUp and Emacspeak to run
together.
If I can get SpeakUp to run I will possibly release an image without
Emacspeak. This will solve the issue for those waiting for a Hynix
chipset bootable image with SpeakUp.
Note that if I can get pulse to play nice on Arch and it solves the
issues, including the kernel oops, then it is likely I can also get
Raspbian to work reliably. Which it currently does NOT.
It's my intention to read all I can find about pulseaudio over the next
few days until I can configure it in the dark, so to speak.
Mike
--
Michael A. Ray
Analyst/Programmer
Witley, Surrey, South-east UK
I KEEP six honest serving-men, They taught me all I know. Their names are What
and Why and When and How and Where and Who.
-- Rudyard Kipling (paraphrased)
Interested in accessibility on the Raspberry Pi?
Visit: http://www.raspberryvi.org/
From where you can join our mailing list for visually-impaired Pi hackers
===========================================================
The raspberry-vi mailing list
Archives: //www.freelists.org/archives/raspberry-vi
Administrative contact: <mike.ray@xxxxxxxxxxxxxx>
-----------------------------------------------------------
Raspberry Pi and the Raspberry Pi logo are trademarks of the Raspberry Pi
Foundation.
This list is not affiliated to the Raspberry Pi Foundation and the views and
attitudes expressed by the subscribers to this list do not reflect those of the
Foundation.
Mike Ray, list creator, January 2013
Other related posts:
