Le 8 oct. 08 à 22:21, Dev Mazumdar a écrit : > Hannu Savolainen wrote: >> Stéphane Letz wrote: >>> Ok. Now testing with O_EXCL and SNDCTL_DSP_COOKEDMODE works, bit >>> I see >>> some strange of the device. The overruns/underrun detection code >>> based >>> on SNDCTL_DSP_GETERROR does not see underrun anymore although the >>> sound get weird with high CPU load (Writing another buffer in the >>> out >>> device solve the "weird sound" problem...). The same overruns/ >>> underrun >>> detection code was working when opening the /dev/dsp0 device (that >>> uses vmix AFAIK) >>> >>> This occurs on OpenSolaris with internal HDAudio using published OSS >>> 4.0. Are tey know problems with this card with OSS 4.0 ? >>> >> I don't think this is caused by problems with any particular card. >> Underruns/overruns will happen if the CPU load gets too high (more >> than >> 80-90%). In this situation the application is not able to process >> audio >> data as fast as it should. It's often possible to decrease the >> problem >> by using higher priority (see man sched_setscheduler). >> >> It is just necessary to write enough silent data to the output device >> before starting the read/write loop. It is normal that the other >> processes running in the computer occasionally delay the audio >> process >> by few milliseconds. If there is not enough data in the playback >> buffer >> then this delay will cause an underrun. In addition recorded data >> will >> get accumulated in the recording device during the delay. This will >> sooner or later cause recording overruns if the application doesn't >> handle this properly. Simple read/write loop (without any >> usleep/whatever calls) will recover from this situation >> automatically. >> >> Best regards, >> >> Hannu >> _______________________________________________ >> oss-devel mailing list >> oss-devel@mailman.opensound.com >> http://mailman.opensound.com/mailman/listinfo/oss-devel >> > > Hi, > > Have you tried to use the fulldup.c test program to see if this works > http://mercurial.opensound.com/?file/2fed97c765ec/tutorials/sndkit/ > samples/fulldup.c
I'll try. > > > If fulldup.c shows problems then there are issues with vmix. > > Have you tried disabling vmix to see if the native device behaves > differently than the vmix device? Underruns/overruns works when used with vmix device (/dev/dsp0), bit not when opening othesr (non vmix devices like /dev/dsp1) in OX_ECL and using SNDCTL_DSP_COOKEDMODE. Regards Stephane Letz _______________________________________________ oss-devel mailing list oss-devel@mailman.opensound.com http://mailman.opensound.com/mailman/listinfo/oss-devel
