[alsa-devel] first and last audio sample timestamp

[Subhashini Rao Beerisetty]

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Hi All,



Hello all,


I’m using aplay and arecord utilities for playback and capture. I need to
capture the timestamps for the first and last audio samples that arrive at
the driver level.

For this I’m capturing the CLOCK_MONOTONIC_RAW timestamp at the
.trigger(for playback & capture) callback in SNDRV_PCM_TRIGGER_START  case
– is it the correct timestamp for the first audio sample arrived at the
driver level?

Similarly does .trigger callbacks SNDRV_PCM_TRIGGER_STOP gives the last
audio sample timestamp?