Re: [Linphone-users] SNDRV_PCM_IOCTL_PREPARE/snd_pcm_writei problem in linphonec

[Simon Morlat]

Hi,

Can't it be the gui frontend that attempts to also open the alsa device to 
play a sound when for example clicking on the answer button ?
I think this is clearly a problem with opening a busy sound device.

Simon

Le Vendredi 12 Mai 2006 17:23, Greg Farrell a écrit :
> Hi,
>
>    I'm controlling linphonec progmatically from a gui front end. The
> fgets() in
> the main loop is replaced with a select()/read on a fifo.
>
> If I make phone calls out everything works perfectly. If I answer a call
> then
> linphone is unable to access the local capture device as far as I can
> tell. So
> 0 packets are listed as sent via rtp, and there are about 10 spams of
>
> (process:2255): MediaStreamer-WARNING **: alsa_card_write:
> snd_pcm_writei() failed:Resource temporarily unavailable.
> ALSA lib pcm_hw.c:466:(snd_pcm_hw_prepare) SNDRV_PCM_IOCTL_PREPARE
> failed: Device or resource busy
>
> I've added logging to alsa_card_open/close_[rw] and it all looks pretty
> sensible. There are no double opens, or any
> opens without a close that I can see. Can anyone give me any suggestions
> why these attempts to access the pcm are
> failing?
>
> Using lsof only linphonec has any alsa devices open. Also the same
> devices are open during a succesful call (one initiated by
> linphone) versus an unsucessful call (one answered by linphone).
>
> linphonec 4283 root  mem    CHR 116,16      4587595 pcmC0D0p
> linphonec 4283 root  mem    CHR 116,24      4587594 pcmC0D0c
> linphonec 4283 root    3u   CHR  116,0      4587542 controlC0
> linphonec 4283 root   14u   CHR 116,24      4587594 pcmC0D0c
> linphonec 4283 root   15u   CHR 116,16      4587595 pcmC0D0p
>
> The call is connected but no data is recorded or sent by linphone. The
> other end hence hears silence.
>
> Are I wrong in thinking that this is a PCM device locking issue? Any
> suggestions on what to try? Everything looks identical
> from the debug lvl 6 logs in a succesful run as in an unsucessful. Right
> up unto the point where it fails to write to the PCM.
>
> I've uploaded some debug logs, including some hopefully self-explanatory
> printfs() of my own at:
> http://pastebin.com/713614
>
>  thanks a lot,
>      Greg
>
>
>
>
>
>
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