[pjsip] Porting to Maemo

Michael CHRISTOPHER pjsip at encambio.com
Wed Apr 2 07:19:06 EDT 2008

Hello Mathieu,

An Wed, Apr 02, 2008, Mathieu MONNEY schrieb:
>An Wed, Apr 02, 2008, Michael CHRISTOPHER schrieb:
>>An Wed, Apr 02, 2008, Benny PRIJONO schrieb:
>>>On Tue, Apr 1, 2008 at 10:18 PM, Michael CHRISTOPHER wrote:
>>>>  [...]
>>>>  I'm wondering if its worth the effort to port portaudio to
>>>>  gstreamer (without OSS/ALSA) and debug the TCP transport. The
>>>>  registrar problem could be easier, namely...
>>>No OSS/ALSA? Sounds like trouble indeed. Rather than porting
>>>PortAudio, I think it would be lot easier to create a sound device
>>>abstraction for pjmedia. The API is whole lot simpler, and there is a
>>>ready to use template for new implementation (namely nullsound.c).
>>Although it appeals to have portaudio for other projects as well,
>>I'll look into abandoning it and developing nullsound.c instead.
>>With some luck I'll have a gstreamified audio device when finished.
>I'm currently porting PJSIP to maemo too. I have written an ALSA
>driver using read/write mode (because PortAudio doesn't support
>read/write mode on alsa) for PJMEDIA it is quite stable now but I
>have still some huge latency problem (like 400ms) but I haven't
>experimented any network problem ! It compiles just fine ! My first
>goal was to try to develop a GStreamer driver for PJMedia but I have
>no idea how exactly gstreamer work and how to get/put raw data
>to/from gstreamer. If you need my very drafty alsa driver code I
>can send it to you.
At first I though the Maemo framework supported ALSA and ESD, but
somebody wrote that Nokia had dropped ALSA support in Maemo 2.2.
I don't see any ALSA libraries libasound.* on the Maemo 2.2 or the
Nokia 770 tablet with the latest OS either, so my question for you
is how did you manage to use ALSA at all? When I run pjsua it fails
with messages such as 'no audio device found'. The pa_devs(1) test
from PortAudio reports no available devices as well.

In any case, I'd be happy to see your work. If it works on my
tablet, I could go on to port other parts of the PJProject. If you
send your code, indicate which version of PJProject you are working
with, and how to apply the patch (patch -p0?).

If you like, you could upload your code or paste it on a message
to this list so that others can enjoy PJSua on Maemo. Whatever the
case, please avoid posting HTML if you can.


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