At Wed, 21 Nov 2007 13:33:59 +0200, Heikki Lindholm wrote: > > Takashi Iwai kirjoitti: > > At Mon, 19 Nov 2007 22:46:31 -0200, > > Claudio Matsuoka wrote: > >> Hi, > >> > >> I'm adding latency control to an application and didn't find much > >> documentation about the pcm status functions aside from a very brief > >> description and the latency.c example. What exactly are the "trigger > >> timestamp" and "now timestamp" returned by > >> snd_pcm_status_get_trigger_tstamp() and snd_pcm_status_get_tstamp()? > > > > The trigger_tstamp is the time-stamp at the last time the PCM status > > change occured. For example, when the PCM is really triggered to > > start, or stopped, or XRUN, etc. It won't be changed as long as the > > PCM status is kept. > > > > OTOH, the tstamp is the current timestamp (now). But, this value has > > a slightly different meaning when tstamp_mode is set to > > SND_PCM_TSTAMP_MMAP. Then it keeps the timestamp of the last period > > update time instead of the now. > > Good explanation. How about adding this to the API documentation, too? > Even a copy-paste of the above would be much much better than what's in > there now (basically repetitions of the already quite verbose function > names.) As usual, a patch is always welcome ;) Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
