Re: [Linphone-developers] oss driver problem

[Simon Morlat]

The OSS backend of linphone starts a thread that makes read/write 
on /dev/dspX, whatever there is only a reader or only a writer.
So it is normal that the process be sometimes suspended into the read().
If it is blocked "eternally" in read(), seems to be a problem with the OSS 
driver.
Try to use an alsa driver, if available.

Simon

Le mercredi 27 septembre 2006 09:17, Yao-Chung Chang a écrit :
> I use the ring program to test the oss driver, I can hear the ring tone
>
> for a moment and got blocked with the following
> messages
>
> drop fragment when buffer gets too much data (xxxx -dicarded:xxx)
> drop fragment when buffer gets too much data (xxxx -dicarded:xxx)
> drop fragment when buffer gets too much data (xxxx -dicarded:xxx)
> drop fragment when buffer gets too much data (xxxx -dicarded:xxx)
>
>
> I've traced the code in oss_thread , and found it got blocked at
>
> int sz = read(d->pcmfd, rtmpbuff, bsize);
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> if (sz!=bsize) ms_warning ("sound device read returned %i !", sz);
>
>
> Since ring didn't create any soundcard reader, why the snippet of code
>
> just keep reading from the sound device?
>
> As I know, oss has some problems, especially in embedded linux, how
>
> do I solve this problem?
>
>         Regards,
>                  ycchang
>
>
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