[pulseaudio-tickets] [Bug 86262] severe underruns with usb audio, works with pa 3.0 - buffer setup seems wrong

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86262

--- Comment #19 from Adam Goode <adam at spicenitz.org> ---
Here is one of the USB devices:
min_period_size: 48 frames, dir: 0
Playback hwparams: FIFO size is 0
Hardware PCM card 4 'USB Audio DAC' device 0 subdevice 0
Its setup is:
  stream       : PLAYBACK
  access       : RW_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 2
  rate         : 48000
  exact rate   : 48000 (48000/1)
  msbits       : 16
  buffer_size  : 4096
  period_size  : 1024
  period_time  : 21333
  tstamp_mode  : NONE
  tstamp_type  : MONOTONIC
  period_step  : 1
  avail_min    : 1024
  period_event : 0
  start_threshold  : 1024
  stop_threshold   : 4096
  silence_threshold: 0
  silence_size : 0
  boundary     : 4611686018427387904
  appl_ptr     : 0
  hw_ptr       : 0
Playing silence
Available: 0, loop iteration: 0
Available: 288, loop iteration: 34594
Available: 528, loop iteration: 42664
Available: 768, loop iteration: 50793
Available: 1056, loop iteration: 58969
Available: 1296, loop iteration: 65564
Available: 1536, loop iteration: 72406
Available: 1824, loop iteration: 81002
Available: 2064, loop iteration: 88159
Available: 2304, loop iteration: 95332
Available: 2592, loop iteration: 103934
Available: 2832, loop iteration: 111106
Available: 3072, loop iteration: 118338
Available: 3360, loop iteration: 126252
Available: 3600, loop iteration: 133532
Available: 3840, loop iteration: 140668


Here is the Scarlett 18i8 (I had to change the format to 32 bit and the
channels to 8):
min_period_size: 6 frames, dir: 0
Playback hwparams: FIFO size is 0
Hardware PCM card 3 'Scarlett 18i8 USB' device 0 subdevice 0
Its setup is:
  stream       : PLAYBACK
  access       : RW_INTERLEAVED
  format       : S32_LE
  subformat    : STD
  channels     : 8
  rate         : 48000
  exact rate   : 48000 (48000/1)
  msbits       : 32
  buffer_size  : 4096
  period_size  : 1024
  period_time  : 21333
  tstamp_mode  : NONE
  tstamp_type  : MONOTONIC
  period_step  : 1
  avail_min    : 1024
  period_event : 0
  start_threshold  : 1024
  stop_threshold   : 4096
  silence_threshold: 0
  silence_size : 0
  boundary     : 4611686018427387904
  appl_ptr     : 0
  hw_ptr       : 0
Playing silence
Available: 0, loop iteration: 0
Available: 240, loop iteration: 22750
Available: 460, loop iteration: 28976
Available: 680, loop iteration: 34986
Available: 901, loop iteration: 41240
Available: 1028, loop iteration: 47730
Available: 1232, loop iteration: 54658
Available: 1436, loop iteration: 60702
Available: 1640, loop iteration: 64736
Available: 1844, loop iteration: 71131
Available: 2048, loop iteration: 77716
Available: 2257, loop iteration: 84263
Available: 2461, loop iteration: 90799
Available: 2665, loop iteration: 97406
Available: 2869, loop iteration: 104008
Available: 3073, loop iteration: 110432
Available: 3277, loop iteration: 116537
Available: 3486, loop iteration: 123147
Available: 3690, loop iteration: 129559
Available: 3894, loop iteration: 136035

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