Takashi Iwai kirjoitti: > At Mon, 26 Nov 2007 09:59:29 +0200, > Heikki Lindholm wrote: >> Jaroslav Kysela kirjoitti: >>> On Mon, 26 Nov 2007, Heikki Lindholm wrote: >>> >>>> Hello, >>>> >>>> Some years ago there was some talk about UST support in Linux, but the >>>> support never happened. With the hrtimers patch (and I'm not quite sure >>>> if even earlier?) CLOCK_MONOTONIC would seem like a fairly good UST time >>>> source. What I'd like to see, is a selectable clock for ALSA >>>> timestamping, e.g. something like snd_sw_params_clock(..., clockid_t >>>> clk). Would this seem plausible? I don't know that much about ALSA >>>> internals, so, no idea whether different clocks on different >>>> pcms/whatever would quickly turn into an unmanageable mess. >>> We are aware about this extension and I already proposed an >>> implementation. I hope to implement it soon. Timestamps are not used in >>> driver internally. >> I can't seem to google up the proposal. I'd like to read it; was it on >> the alsa ml? > > Yes, it was on alsa-devel ML. At that time I didn't like the proposal > much because currently there was no real user of timestamps. What do you mean by this? Aren't all applications that try to do playback/capture A/V sync or sync between two audio cards or latency measurement potential users? And those kind of apps have definitely been there before 2007-02 (Jaroslav's RFC's date.) If you mean _monotonic_ timestamps, not all users would probably care, though. -- Heikki Lindholm _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
