[alsa-devel] Unknown PCM cards.pcm.front
In my custom cape for Beaglebone black, I'm able to play audio reasonably well. But for one situation when my C++ app (which plays via libao) opens an output, this is written to my app's output:
"ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.front"
Googling, I found this advice:
http://alexpb.com/notes/articles/2012/11/14/error-when-playing-audio-on-rasp...
Which works.
My question is, why do I get it only in this instance? Is it because I might be opening the audio device twice simultaneously? That's about the only thing that might set this situation apart from all the others.
TIA,
On Oct 29, 2015, at 05:47 , Clemens Ladisch clemens@ladisch.de wrote:
Rick Mann wrote:
"ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.front"
This means that some code tried to open device named "front", and that there is no such definition for your hardware.
Thanks, Clemens,
Here's my code that opens the device:
int driverID = ::ao_default_driver_id(); ao_sample_format format = { 0 }; format.bits = 16; format.channels = inNumChannels; format.rate = inRate; format.byte_format = AO_FMT_LITTLE; mDevice = ::ao_open_live(driverID, &format, NULL); if (mDevice == NULL) { LogDebug("Error opening output device"); }
I'm not sure where the change in default device would come from.
participants (2)
-
Clemens Ladisch -
Rick Mann