[pulseaudio-discuss] Monitoring USB sound card using pulse monitor.

[Colin Guthrie]

'Twas brillig, and Amar Akshat at 25/06/12 05:27 did gyre and gimble:
> Now when I play a music on my on-board sound device (HDA Intel), and execute
> 
> *arecord -Dpulse_monitor -c2 -fS32_LE /dev/null -vvv*
> 
> I am able to monitor.
> 
> However, when I monitor and do the following, 
> *arecord -Dpulse_monitor1 -c2 -fS32_LE /dev/null -vvv*
> *
> *
> *&*
> *
> *
> *aplay -Dhw:1 -c1 -fS16_LE song.wav, *
> 
> the o/p is 
> 
> *aplay: main:660: audio open error: Device or resource busy. *

This is expected as the pulse_monitor device will require the device to
be opened by PulseAudio, but the aplay command is also trying to open
the same device which results in this problem as the device can only be
opened once in a typical setup (it requires h/w mixing to work otherwise).

You really need to play the song.wav via PulseAudio and not via the hw
directly to get the results you need.

Col



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Colin Guthrie
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