It seems the Alsa level scope plugins fails with recent alsa cvs .
(2 level plugins have the same problem: the one from Abramo Bagnara , and ameter :
http://perso.club-internet.fr/lgeorget/ameter.html
)
There is no problem with 0.9rc7 (and installing alsa-lib-0.9rc7 while keeping
alsa-driver from cvs, solves the problem ) .
It fails when using low buffer size, necessary for multitrack recording . I first saw the problem with Glame but it exists also with aplay ( see below for the error messsage ) .
The error occures often but randomely , except when clicking somewhere in another window : this always produces the error.
It is not related to xruns, as sometimes aplay reports xrun but does not fail .
There is no error when using default plugin , or default buffer size.
Looking at pcm_meter.c , the following line is added in cvs: pcm->poll_events = slave->poll_events; So I tried in non blocking mode (aplay -N ... ) : then it works It would be of course much better if it could work in standard mode .
(This is with Mandrake 9.)
Any advice highly appreciated . ( Including that this problem cannot be solved !)
Laurent
aplay -D level -B 10000 -v sound.wav
Playing WAVE 'sound.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo Meter PCM 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 : 441 period_size : 110 period_time : 2494 tick_time : 10000 tstamp_mode : NONE period_step : 1 sleep_min : 0 avail_min : 110 xfer_align : 110 start_threshold : 440 stop_threshold : 441 silence_threshold: 0 silence_size : 0 boundary : 1849688064 Slave: Plug PCM: Hardware PCM card 0 'Ensoniq AudioPCI' device 0 subdevice 0
aplay: pcm_write:1014: write error: Input/output error
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