Re: several second latency with USB audio

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Sergei Steshenko wrote:
>     Понедельник, 4 января 2016, 18:45 +01:00 от Clemens Ladisch <cladisch@xxxxxxxxxxxxxx>:
>
>     Sergei Steshenko wrote:
>     > I have developed a piece of code (as LADSPA plugin) which among other things multiplexes one of two input streams into output stream.
>     >
>     > Though switching worked, latency was several seconds long instead fraction of a second.
>     >
>     > Because of the latency I suspected a problem with my code, but after creating a special test audio files I've established that the multiplexing happens fast - within my LADSPA host buffer length, as expected. And the buffer length was 1024 samples @44100KHz.
>
>     What is the buffer length of the device?
>     (see /proc/asound/card*/pcm0p/sub0/hw_params)
>
> "buffer_size: 262144", and 262144/48000 is about 5.46 seconds - feels about right.

The audio device is configured by whatever program actually writes to it,
probably your host.  What is it?  How is it configured?


Regards,
Clemens

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