Re: [alsa-devel] [PATCH v4 05/10] ALSA: core: selection of audio_tstamp type and accuracy reports

31.01.2015 04:55, Pierre-Louis Bossart wrote:

Audio timestamps can be extracted from sample counters, wall clocks, PHC clocks (Ethernet AVB), on-demand synchronized snapshots. This patch provides the ability to report timestamping capabilities, select timestamp types and retrieve timestamp accuracy, if supported. Details can be found in Documentations/sound/alsa/timestamping.txt

I think that it is a good idea to add some example ./audio_time output on a card that is neither HDAudio nor USB audio (i.e. a card not specifically touched by your patches), so that the fallback behavior is known.