24 Mar
2006
24 Mar
'06
8:09 a.m.
Hi,
I'm still trying to grok alsa, and now I have the following problem:
I'm using snd_pcm_writei to playback some audio, however, after a
little time the call fails with the error: "File descriptor in bad
state", which I believe I cannot recover from.
Why does this happen, and what could I do about this?
cat /proc/asound/card0/pcm0p/sub0/* prints the following stuff, I
don't know whether this is helpful?
access: MMAP_INTERLEAVED
format: S16_LE
subformat: STD
channels: 2
rate: 48000 (48000/1)
period_size: 8192
buffer_size: 16384
tick_time: 1000
card: 0
device: 0
subdevice: 0
stream: PLAYBACK
id: VIA 8235
name: VIA 8235
subname: subdevice #0
class: 0
subclass: 0
subdevices_count: 4
subdevices_avail: 3
64
state: RUNNING
trigger_time: 1143205215.076663000
tstamp : 1143205216.323831000
delay : 13856
avail : 2528
avail_max : 14368
-----
hw_ptr : 59872
appl_ptr : 73728
tstamp_mode: NONE
period_step: 1
sleep_min: 0
avail_min: 8192
xfer_align: 8192
start_threshold: 1
stop_threshold: 16384
silence_threshold: 0
silence_size: 0
boundary: 1073741824
26 Mar
26 Mar
11:50 p.m.
On Fri, 2006-03-24 at 14:09 +0100, Richard Spindler wrote:
I'm using snd_pcm_writei to playback some audio,
however, after a
little time the call fails with the error: "File descriptor in bad
state", which I believe I cannot recover from.
Why does this happen, and what could I do about this?
cat /proc/asound/card0/pcm0p/sub0/* prints the following stuff, I
don't know whether this is helpful?
access: MMAP_INTERLEAVED
You have set up the device for MMAP mode with
snd_pcm_hw_params_set_access() but are trying to use read/write which
won't work. Set the access mode to RW.
Lee
27 Mar
27 Mar
1:52 a.m.
2006/3/27, Lee Revell <rlrevell(a)joe-job.com>om>:
Hm, I'm calling snd_pcm_hw_params_set_access( handle, params,
SND_PCM_ACCESS_RW_INTERLEAVED ) in my code, but it seems as if there
is something screwed. I'll check that, thanks for the hint.
-Richard
access:
MMAP_INTERLEAVED
You have set up the device for MMAP mode with
snd_pcm_hw_params_set_access() but are trying to use read/write which
won't work. Set the access mode to RW. 
4:32 a.m.
Lee Revell wrote:
On Fri, 2006-03-24 at 14:09 +0100, Richard Spindler
wrote:
I guess the actual device being used is "default" which is probably a
dmix device that uses the hardware device as a slave. In this case, the
hardware device will continue running even when the dmix device is in a
bad state.
Richard, was is the state of your device? (See snd_pcm_dump() or
snd_pcm_state().)
Regards,
Clemens
I'm using snd_pcm_writei to playback some
audio, however, after a
little time the call fails with the error: "File descriptor in bad
state", which I believe I cannot recover from.
Why does this happen, and what could I do about this?
cat /proc/asound/card0/pcm0p/sub0/* prints the following stuff, I
don't know whether this is helpful?
access: MMAP_INTERLEAVED
You have set up the device for MMAP mode
6611
days inactive
6614
days old
linux-audio-dev@lists.linuxaudio.org
3 comments
3 participants
participants (3)
-
Clemens Ladisch -
Lee Revell -
Richard Spindler