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Re: [Discuss-gnuradio] portaudio sink, partial succes on windows
From: |
Martin Dvh |
Subject: |
Re: [Discuss-gnuradio] portaudio sink, partial succes on windows |
Date: |
Tue, 21 Mar 2006 04:08:45 +0100 |
User-agent: |
Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.5b) Gecko/20030823 |
Robert McGwier wrote:
Thanks to tons of grunt work by Eric, we have used the highly tuned
ring buffers in the audio_portaudio_sink code and it functions nicely
with a little bit of operator help. I can now get solid performance
on all Linux hosts with the example code
mono_tone_portaudio.py and multi_tone_portaudio.py.
All worked on oss, alsa, and jack.
Eric got similar performance.
Thomas Schmid ran mono_tone_portaudio.py successfully on his mac with
coreaudio automatically identified as the host. We had to modify the
buffer size calculation (by forcing it). This will improve over the
next few days as the audio_portaudio_source gets built and these very
large portaudio messages which are delivered in device and stream info
structs are parsed more carefully.
It is not clear to me that we want to prefer portaudio talking to jack
over directly talking to jack. This might change if we (Stephane, me,
others) improve the portaudio jack handler. For now, my thinking is
we are probably better off and we will be more versatile talking
directly to jack without portaudio but we can do this kind of thinking
after we get this portaudio stuff fully stabilized.
I am hoping the Windows folks can bring their code up now as well.
Portaudio is really solid on Windows as I have been using it there for
ASIO, MME, and DirectX for two years and after I helped Eric Wachsman
get a leg up (by leaning on my friends for help) he got WDM-KS running.
WDM-KS is the single lowest latency sound host I have seen in ANY
personal computer but let me say that I have never used a Mac. If
anyone working on the windows code needs a dll, export library,
Microsoft .NET 2003 project for v-19 devel, please let me know. We
should be able to build the dll under mingw but I have not tried yet.
That said, all of this portaudio stuff about latency this and that make
very little sense for what we are doing. What we need is not
necessarily very low latency but rock solid performance using buffer
sizes that make sense for our applications.
A partial success on windows.
I have portaudio running on windows (just the wmme driver) and for the first
time I hear sounds without too much crackles here.
I needed only a few tweaks.
Most important, don't use standard cvs HEAD of portaudio but the special cvs
v19-devel version
I missed the following comment in one of the portaudio mails
>It will be important to stay current:
>
>cvs -d:pserver:address@hidden:/home/cvs co -r v19-devel portaudio
I had done a normal cvs HEAD checkout and got loads of problems first.
You really need the -r v19-devel options.
Once that was sorted out I did the following.
This is all using mingw:
Update/build/install gnuradio-core
do a configure/build/install for portaudio-v19-devel (only default configure
options, so it is using the wmme driver)
Then I had to make the following symbolic link:
/usr/local/lib/pkgconfig/portaudio-2.0.pc ->
/usr/local/lib/pkgconfig/portaudio.pc
then checkout gr-audio-portaudio
do a bootstrap
Check that the latest libtool version is used
do a configure/build/install
update gnuradio-examples
run:
dial_tone_portaudio.py
mono_tone_portaudio.py
multi_tone_portaudio.py
All run fine ;-)
modify usrp/usrp_wfm_rcv.py to use portaudio
run it
listen to my favourite FM station without too much crackles.
(The audio is not completely clean yet, but probably the ks driver will help
here)
now run usrp/usrp_wfm_pll_PA.py
runtime error popup immediately
change from non-blocking to blocking portaudio
runtime error popup immediately
disable fft displays
runs ok for 5 to 20 seconds
after that a runtime error popup
enable non-blocking again
runtime error popup immediately
The runtime error I get is a popup:
(also see attached image runtime_error.gif)
"Microsoft Visual C++ Runtime Library
Runtime Error!
Program: d:\Python24\python.exe
abnormal program termination"
So it only works with blocking enabled and no ffts, and only for a few seconds.
I think it has to do with something not keeping up.
I can force this error by clicking on any other open program window or moving
another window.
I then tried opening/moving windows while running multi_tone.py and this causes
multi_tone.py to stop too with the same runtime error.
Running a high computational load in the background doesn't seem to hurt
multi_tone.py.
Many thanks for making this work, so far.
No it is time for finetuning and getting rid of problems like these.
I people want to try this at home, I have binary installers for windows
available for this partially working portaudio driver.
Greetings,
Martin