>Понедельник, 4 января 2016, 18:45 +01:00 от Clemens Ladisch ><cladi...@googlemail.com>: > >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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