alsa log with "default"

./pcm_min_v1 /opt/audio/share/Pachelbel_inspired_44100.wav
Plug PCM: Rate conversion PCM (48000, sformat=S16_LE)
Converter: linear-interpolation
Protocol version: 10002
Its setup is:
  stream       : PLAYBACK
  access       : RW_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 2
  rate         : 44100
  exact rate   : 44100 (44100/1)
  msbits       : 16
  buffer_size  : 705
  period_size  : 176
  period_time  : 4000
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 176
  period_event : 0
  start_threshold  : 704
  stop_threshold   : 705
  silence_threshold: 0
  silence_size : 0
  boundary     : 1478492160
Slave: Route conversion PCM (sformat=S16_LE)
  Transformation table:
    0 <- none
    1 <- none
    2 <- 0*0.3
    3 <- 1*0.3
    4 <- none
    5 <- none
    6 <- none
    7 <- none
Its setup is:
  stream       : PLAYBACK
  access       : MMAP_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 2
  rate         : 48000
  exact rate   : 48000 (48000/1)
  msbits       : 16
  buffer_size  : 768
  period_size  : 192
  period_time  : 4000
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 192
  period_event : 0
  start_threshold  : 768
  stop_threshold   : 768
  silence_threshold: 0
  silence_size : 0
  boundary     : 1610612736
Slave: Direct Stream Mixing PCM
Its setup is:
  stream       : PLAYBACK
  access       : MMAP_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 8
  rate         : 48000
  exact rate   : 48000 (48000/1)
  msbits       : 16
  buffer_size  : 768
  period_size  : 192
  period_time  : 4000
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 192
  period_event : 0
  start_threshold  : 768
  stop_threshold   : 768
  silence_threshold: 0
  silence_size : 0
  boundary     : 1610612736
Hardware PCM card 0 'Baytrail_audio' device 0 subdevice 0
Its setup is:
  stream       : PLAYBACK
  access       : MMAP_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 8
  rate         : 48000
  exact rate   : 48000 (48000/1)
  msbits       : 16
  buffer_size  : 768
  period_size  : 192
  period_time  : 4000
  tstamp_mode  : ENABLE
  period_step  : 1
  avail_min    : 192
  period_event : 0
  start_threshold  : 1
  stop_threshold   : 1610612736
  silence_threshold: 0
  silence_size : 1610612736
  boundary     : 1610612736
  appl_ptr     : 0
  hw_ptr       : 117439104
rret = 4
snd_pcm_writei:frames: 2048
Short write (expected 16384, wrote 2048)
rret = 4
snd_pcm_writei:frames: -32
ALSA lib pcm.c:7339:(snd_pcm_recover) underrun occurred
rret = 4
snd_pcm_writei:frames: 2048
Short write (expected 16384, wrote 2048)
rret = 4
snd_pcm_writei:frames: -32
ALSA lib pcm.c:7339:(snd_pcm_recover) underrun occurred
rret = 4
snd_pcm_writei:frames: 2048
Short write (expected 16384, wrote 2048)
rret = 4
snd_pcm_writei:frames: -32
ALSA lib pcm.c:7339:(snd_pcm_recover) underrun occurred
rret = 4
snd_pcm_writei:frames: 2048
Short write (expected 16384, wrote 2048)
rret = 4
snd_pcm_writei:frames: -32
ALSA lib pcm.c:7339:(snd_pcm_recover) underrun occurred
rret = 4
snd_pcm_writei:frames: 2048
Short write (expected 16384, wrote 2048)
rret = 4
snd_pcm_writei:frames: -32
ALSA lib pcm.c:7339:(snd_pcm_recover) underrun occurred
rret = 4
snd_pcm_writei:frames: 2048
Short write (expected 16384, wrote 2048)
rret = 4
snd_pcm_writei:frames: -32
ALSA lib pcm.c:7339:(snd_pcm_recover) underrun occurred
rret = 4
snd_pcm_writei:frames: 2048
Short write (expected 16384, wrote 2048)
rret = 4
snd_pcm_writei:frames: -32
ALSA lib pcm.c:7339:(snd_pcm_recover) underrun occurred
rret = 4
snd_pcm_writei:frames: 2048
Short write (expected 16384, wrote 2048)
^C