Hi,
I want to approximate the delay between the time I provide a sample to ALSA and the time it is presented. I thought snd_pcm_status_get_delay would help me but I am confused about the output."Delay is distance between current application frame position and sound frame position. It's positive and less than buffer size in normal situation, negative on playback underrun and greater than buffer size on capture overrun."
Though, on both systems the delay is constant. Period size does not seem to matter. On the eval board the delay is always equal to the period size. On my workstation it is twice the period time for small sizes and for larger sizes it is slightly larger than the period size. But it is always the same value.I call snd_pcm_status_get_delay says almost directly after snd_pcm_avail_update. I also tried with snd_pcm_avail. No difference.
What is going on here? Is this expected behaviour? Could it be related to the drivers for the devices I use?
Thanks
Jan
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