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Topic: how to modify alsa peiod_time (Read 864 times) previous topic - next topic
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how to modify alsa peiod_time

Hi all,
when i run an arecord command with verbiose -v on my machine (an ARM embedded system with an audio card, i get following print out:
//////////////////////////////////
Its setup is:
  stream       : CAPTURE
  access       : MMAP_INTERLEAVED
  format       : S32_LE
  subformat    : STD
  channels     : 8
  rate         : 24000
  exact rate   : 24000 (24000/1)
  msbits       : 32
  buffer_size  : 4096
  period_size  : 256
  period_time  : 10666
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 256
  period_event : 0
  start_threshold  : 3
  stop_threshold   : 4096
  silence_threshold: 0
  silence_size : 0
  boundary     : 1073741824
  appl_ptr     : 0
  hw_ptr       : 0
////////////////////////////////

I know these info are coming from libasound library, but I am looking for a way to modify the period_time to a fix value I wanted. (~20ms instead of the current 10.666ms). Is there a way to do that with an alsa confguration file such as asoundrc or else? if so, how to define this parameter (period_time) and how.

Thanks,