alsa-project/alsa-lib issue #405 was edited from DocMAX:

``` pcm.a52 { @args [CARD] @args.CARD { type string } type rate slave { pcm { type a52 bitrate 448 channels 6 card $CARD } rate 48000 } }

a52:CARD=Adapter USB SPDIF Adapter Plugin to convert multichannel stream to A52 (AC3) bitstream

[root@desktop ~]# speaker-test -c6 -Da52

speaker-test 1.2.12

Playback device is a52 Stream parameters are 48000Hz, S16_LE, 6 channels Using 16 octaves of pink noise ALSA lib pcm_rate.c:1701:(_snd_pcm_rate_open) Unknown field card Playback open error: -22,Invalid argument ``` how to fix this error? running arch linux all updated

Issue URL : https://github.com/alsa-project/alsa-lib/issues/405 Repository URL: https://github.com/alsa-project/alsa-lib