[pulseaudio-tickets] [Bug 87713] "Transistor" game makes every client playing at double speed

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87713

--- Comment #68 from rkfg <rkfg at rkfg.me> ---
Interesting. I've converted that file to 44100 Hz and now it reveals a strange
behavior. When I play it with buffer size of 64 it sounds like the pitch is
lower than it should be (even if it doesn't overrun though it does from time to
time). When the size is 128 it sounds fine.

# aplay -D plughw:CARD=CA0106 -v --buffer-size=64 /tmp/kde44100.wav
Playing WAVE '/tmp/kde44100.wav' : Signed 16 bit Little Endian, Rate 44100 Hz,
Stereo
Plug PCM: Rate conversion PCM (48000, sformat=S16_LE)
Converter: libspeex (builtin)
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  : 58
  period_size  : 14
  period_time  : 333
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 14
  period_event : 0
  start_threshold  : 58
  stop_threshold   : 58
  silence_threshold: 0
  silence_size : 0
  boundary     : 4179340454199820288
Slave: Hardware PCM card 0 'CA0106' device 0 subdevice 0
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  : 64
  period_size  : 16
  period_time  : 333
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 16
  period_event : 0
  start_threshold  : 64
  stop_threshold   : 64
  silence_threshold: 0
  silence_size : 0
  boundary     : 4611686018427387904
  appl_ptr     : 0
  hw_ptr       : 0
underrun!!! (at least 0.116 ms long)
Status:
  state       : XRUN
  trigger_time: 301642.243139271
  tstamp      : 301642.243254519
  delay       : 2
  avail       : 56
  avail_max   : 56

# aplay -D plughw:CARD=CA0106 -v --buffer-size=128 /tmp/kde44100.wav            
Playing WAVE '/tmp/kde44100.wav' : Signed 16 bit Little Endian, Rate 44100 Hz,
Stereo
Plug PCM: Rate conversion PCM (48000, sformat=S16_LE)
Converter: libspeex (builtin)
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  : 117
  period_size  : 29
  period_time  : 666
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 29
  period_event : 0
  start_threshold  : 117
  stop_threshold   : 117
  silence_threshold: 0
  silence_size : 0
  boundary     : 4215369251218784256
Slave: Hardware PCM card 0 'CA0106' device 0 subdevice 0
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  : 128
  period_size  : 32
  period_time  : 666
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 32
  period_event : 0
  start_threshold  : 128
  stop_threshold   : 128
  silence_threshold: 0
  silence_size : 0
  boundary     : 4611686018427387904
  appl_ptr     : 0
  hw_ptr       : 0

This pitch (or maybe speed?) weirdness occurs only on playing stereo files with
rate of 44100. I've tried playing music and it indeed sounds a bit transposed.
Bufsize of 128 frames also seems to produce underruns after some time, my
testing clip was too small to reveal it. So it required bufsize 512 to be
played completely without underruns:

# aplay -D plughw:CARD=CA0106 -v --buffer-size=512 /tmp/ksp44100.wav
Playing WAVE '/tmp/ksp44100.wav' : Signed 16 bit Little Endian, Rate 44100 Hz,
Stereo
Plug PCM: Rate conversion PCM (48000, sformat=S16_LE)
Converter: libspeex (builtin)
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  : 529
  period_size  : 132
  period_time  : 3000
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 132
  period_event : 0
  start_threshold  : 529
  stop_threshold   : 529
  silence_threshold: 0
  silence_size : 0
  boundary     : 4764808405757984768
Slave: Hardware PCM card 0 'CA0106' device 0 subdevice 0
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  : 576
  period_size  : 144
  period_time  : 3000
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 144
  period_event : 0
  start_threshold  : 576
  stop_threshold   : 576
  silence_threshold: 0
  silence_size : 0
  boundary     : 5188146770730811392
  appl_ptr     : 0
  hw_ptr       : 0

The same song converted to 48000 Hz plays without underruns with buffer size of
256 frames:

Playing WAVE '/tmp/ksp48000.wav' : Signed 16 bit Little Endian, Rate 48000 Hz,
Stereo
Plug PCM: Hardware PCM card 0 'CA0106' 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  : 256
  period_size  : 64
  period_time  : 1333
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 64
  period_event : 0
  start_threshold  : 256
  stop_threshold   : 256
  silence_threshold: 0
  silence_size : 0
  boundary     : 4611686018427387904
  appl_ptr     : 0
  hw_ptr       : 0

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/pulseaudio-bugs/attachments/20150110/9d34de59/attachment.html>