Re: [alsa-devel] snd_pcm_status_get_tstamp()

At Mon, 31 Dec 2007 17:53:40 +0100, Lennart Poettering wrote:

Hi!

The documentation for snd_pcm_status_get_tstamp() is not really enlightening. After a call to snd_pcm_status() what data does the tstamp field actually carry? Some kind of system clock timestamp when the data in the status struct was valid, or some kind of sound card clock timestamp that is relative to the point in time where the device was opened/started?

In the normal mode, it's the timestamp at the moment snd_pcm_status() is processed. OTOH, the trigger_tstamp is the time that the trigger callback was called (e.g. the stream starts / stops). The time is the system-wide time, equivalent with the normal gettimeofday().

Takashi