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.
>
> Initially I was debugging the whole issue using a USB audio card with standard USB (coming with the kernel) audio driver.
>
> 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)
Regards,
Clemens
Here it is:
"
sergei@amdam2:~/tmp> cat /proc/asound/card2/id
DeviceEEPROM
"
- yes, this is the card, it is
"
lsusb
Bus 001 Device 005: ID 0c76:161f JMTek, LLC.
",
and the requested info proper:
"
~/tmp> cat /proc/asound/card2/pcm0p/sub0/hw_params
access: MMAP_INTERLEAVED
format: S16_LE
subformat: STD
channels: 2
rate: 48000 (48000/1)
period_size: 1115
buffer_size: 262144
",
i.e. "buffer_size: 262144", and 262144/48000 is about 5.46 seconds - feels about right.
Regards,
Sergei.
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