It seems that there is a limit of 32 pcm softvol interfaces.
In my test script I loop running speaker-test with a new softvol
on each run and finally see this after creating 32 pcm softvol.
speaker-test 1.0.27.2
Playback device is default
Stream parameters are 48000Hz, S16_LE, 1 channels
Using 16 octaves of pink noise
ALSA lib pcm_softvol.c:747:(softvol_load_control) Cannot add a control
Playback open error: -12,Cannot allocate memory
This is the code we use in asound.conf to create the softvol:
pcm.softvol
{
type softvol
slave
{
pcm "playback"
format "S16_LE"
}
control
{
name
{
@func concat
strings [ "NTB_"
{
@func getenv
vars [ ONELAN_MIXER_SUFFIX ]
default "Unknown"
}
]
}
card "PCH"
}
}
pcm.!default
{
type plug
slave.pcm "softvol"
}
I have been reading alsa code and Googling but have not yet found where this
limit
is coming from.
Could you point in the right direction please?
Barry
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