alsa-project/alsa-lib issue #135 was opened from flatmax:

One soundcard I use has different output and input sample formats. The input format is S32_LE. The output format is S24_3LE. There is also a routing change I like to do.

My current .asoundrc (below) uses the asym plugin to manage input and output difference. The asym plugin creates problems for some unknown reason where I get overruns : `ALSA lib pcm.c:8545:(snd_pcm_recover) overrun occurred`

If I switch my setup to using the soundcard for output and a second USB microphone for input, then I don't get any overruns. I still use the asym plugin to make it work and it works nicely.

I have also tried simply the plug pluging, however I still get overruns.

Is there any way to setup the one soundcard with routing and format changes without using the asym plugin ? Or is there a better way to setup the one soundcard with the required routing and format changes ?

``` ########## BEGIN ~/.asoundrc ################### @hooks [ { func load files [ "~/.asoundrc" ] errors false } ]

pcm.!default { type asym playback.pcm "UMC1820_12ch_play" capture.pcm "UMM6_capt" }

ctl.!default { type hw card "UMC1820_8ch" }

pcm.UMC1820_12ch_play { type route; slave.pcm "hw:UMC1820"; slave.format S24_3LE; slave.channels 12; ttable.0.2 1 ttable.1.3 1 ttable.2.4 1 ttable.3.5 1 ttable.4.6 1 ttable.5.7 1 ttable.6.8 1 ttable.7.9 1 ttable.8.10 1 ttable.9.11 1 ttable.10.0 1 ttable.11.1 1 }

pcm.UMM6_capt { type linear slave.pcm "hw:UMM6" slave.format S16_LE; } ########## END ~/.asoundrc ###################

```

Issue URL : https://github.com/alsa-project/alsa-lib/issues/135 Repository URL: https://github.com/alsa-project/alsa-lib