At Mon, 23 Oct 2006 16:31:07 +0200, Johannes Berg wrote: > > > > Right, but prepare can sleep as well so it's easy to do. Though if the > > > prepare doesn't actually change anything, couldn't we not stop the DMA > > > and just continue? > > > > It's up to you. My point is the prepare callback is called anyway, > > and if you want to resolve the DMA call conflict, prepare callback is > > the right place. But, if trigger(START) checks whether the DMA is > > already is running and just continues, then yes, you don't have to > > wait in prepare. > > But is prepare also called between pause/resume? I was assuming it > isn't. It won't be called unless PCM_INFO_PAUSE bit flag is set. It means that the driver doesn't support the hardware pause/resume function. The pseudo pause/resume is just like a stop -> reset -> start sequence. In other words, once when you set SNDRV_PCM_INFO_PAUSE flag, the driver has to stop the stream by trigger(PAUSE_PUSH) and restart the stream by trigger(PAUSE_RELEASE) call without prepare callback. Takashi ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
