topic Not able to play two different sampled audio simultaneously using two different devices using cs42888-audio in i.MX Processors

Not able to play two different sampled audio simultaneously using two different devices using cs42888-audio

harekrishnaroy — Mon, 14 Mar 2016 14:49:02 GMT

I am using yocto build setup and trying to play audio using inbuilt audio card cs42888-audio. Doing aplay -l list the capability of audio cards as below:

root@imx6qsabreauto:~# aplay -l

**** List of PLAYBACK Hardware Devices ****

card 0: cs42888audio [cs42888-audio], device 0: HiFi cs42888-0 []

Subdevices: 1/1

Subdevice #0: subdevice #0

card 0: cs42888audio [cs42888-audio], device 1: HiFi-ASRC-FE (*) []

Subdevices: 1/1

Subdevice #0: subdevice #0

card 2: imxhdmisoc [imx-hdmi-soc], device 0: i.MX HDMI Audio Tx hdmi-hifi-0 []

Subdevices: 1/1

Subdevice #0: subdevice #0

As it is clear that card 0 have two audio devices 0 and 1. I want to play 48khz stereo audio through hw:0,0 and 16khz mono audio through hw:0,1. But they are not playing in parallel.

The problem is that if i am playing any one of two audio and start playing second audio; first audio stops playing and 2nd audio starts. But I expect mixed audio to be heard.

I tried changing asound.conf file (used dmix and plug alsa plugin) and added virtual device with desired configuration but parallel playback failed. Though, I am able to play two audio through same device in parallel.

Re: Not able to play two different sampled audio simultaneously using two different devices using cs42888-audio

igorpadykov — Tue, 15 Mar 2016 01:47:27 GMT

Hi Hare

seems this is not possible as cs42888 has one clock (frame and bit) for

all channels.

Best regards

igor

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Re: Not able to play two different sampled audio simultaneously using two different devices using cs42888-audio

abhishekkumar1 — Tue, 15 Mar 2016 06:51:07 GMT

Hi igor,

Can you explain your assumption?