The sound control code for oss is in mediastreamer/osscard.c. I think your oss driver doesn't like the way linphone uses it: minimum latency using the SUBDIVDE ioctl() and non-blocking read() (uses select with 0 timeout before). You can try some changes in osscard.c to try to figure out what is going wrong. Good luck, Simon
Le Mercredi 4 Mai 2005 07:27, Anand S. Katti a �crit�: > Hi Simon, > > Im glad to get your comments on this. > I have suspected scheduling issue at the read/write operation. To find out > , i just wrote a voice send/receive socket program for simputer PDA. > I have a small jitter buffer of 5x160 bytes. This program worked well, i > could speak and hear proerly on the PDA. There was no voice clutter or > delay in playback. > > Simputer has on board Philipls sound chipset. > > Could you please suggest me any alternatives on solving this problem. > > Thanking you in advance, > Anand > > On Tue, 3 May 2005, Simon Morlat wrote: > > Hello, > > > > This problem is usually caused by "not really good" oss sound drivers, > > especially in full duplex mode. I hope alsa drivers to solve that (as > > they did for PCs) but there are not finished for all PDA's sound chipsets > > of the world. > > > > Simon > > > > Le Mercredi 27 Avril 2005 19:15, Anand S. Katti a �crit�: > > > Dear All, > > > > > > > > > I have tried almost all possible options to get uncluttered voice on > > > strong ARM PDA. Now im left with no options other than this list. > > > > > > cross compilation of libosip2 and linphone-1.0.1= OK > > > cross compilation os SPEEX 1.17 = OK > > > sound driver = oss > > > ALSA DRIVERS=tried cross compiling for strong ARM but failed 1000 times > > > in asm code. > > > VOICE CALL = OK > > > CODECS used = GSM, PCMU,PCMA > > > SPEEX = quality pathetic, may be because of FP OPERATIONS. > > > > > > PROBLEM= with any of the above codec, i hear very choppy voice, quality > > > is ok but its cluttered. I feel as if the sound card is closing and > > > opening.... > > > > > > Could you any of you please get the odd man out of this ? > > > > > > SPECS: intel strong arm PDA > > > > > > > > > > > > > > > > > > _______________________________________________ > > > Linphone-users mailing list > > > [email protected] > > > http://lists.nongnu.org/mailman/listinfo/linphone-users _______________________________________________ Linphone-users mailing list [email protected] http://lists.nongnu.org/mailman/listinfo/linphone-users
