On Wed, Aug 28, 2019 at 5:17 PM Pavel Hofman <pavhofman@xxxxxxxxx> wrote: > IMO some common time frame must be used. E.g. kernel time in nanoseconds. > > How about something like this: > > 1) the core PCM part of alsa driver would keep relative samplerate and > present such value in proc/sysfs to userspace. > the calculation something like: > copied X sample frames in Y kernel nanosecs (for the last e.g. approx. > 30 secs ), with nominal samplerate 48kHz. The value would be > (10^9 * X frames/Y nanosecs) / 48000 Hz samplerate = e.g. 1.00001 Perhaps the relative throughput could be calculated in alsa-lib when talking to the driver? It has the same information available. Turned-on by some environment var, regular output to some /tmp file named after the corresponding hw card. Or does please alsa-lib have some existing debug output, similar to /proc/asound, apart of stderr? I very much appreciate any comments. IMO this would be a very useful improvement, there are lots of RPi projects which would benefit from properly working USB-audio connectivity. Thanks, Pavel. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
