[alsa-devel] "Resource temporarily unavailable" while reading although poll returns POLLIN event

[Stefan Schoenleitner]

Jaroslav Kysela wrote:
> On Wed, 21 Apr 2010, Stefan Schoenleitner wrote:
>> I suspect that this is a bug in ALSA ?
> 
> It might be. Could you post snd_pcm_dump() when you read less frames?

Sure, here's the output:

-----------------------------------------------------------------
snd_pcm_avail_update(capture): 11
demangled poll: POLLIN  on capture device
could not read from capture device: Resource temporarily unavailable
ALSA <-> PulseAudio PCM I/O Plugin
Its setup is:
  stream       : CAPTURE
  access       : RW_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 1
  rate         : 8000
  exact rate   : 8000 (8000/1)
  msbits       : 16
  buffer_size  : 640
  period_size  : 160
  period_time  : 20000
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 160
  period_event : 0
  start_threshold  : 160
  stop_threshold   : 320
  silence_threshold: 0
  silence_size : 0
  boundary     : 5764607523034234880
-----------------------------------------------------------------

As you can see I'm using pulseaudio.
The version I'm using is 1:0.9.14-0ubuntu20 (on ubuntu jaunty).

For testing purposes I increased the period size to 320 so that the
program works on my hardware sound card "hw".
It turned out that the program is working fine there and the poll()
behavior is as it should be.

cheers,
stefan