Audio testing fails with tinyplay command on i.MX8M EVK

[deexithamba]

Hello,

Tinyplay utility fails to play a sample audio wav file when followed with the below steps on Android platform,

evk_8mq:/storage/emulated/0 # tinyplay testw2.wav

Unable to open PCM device 0 (cannot set hw params: Invalid argument)

No parameters are observed under ctl,type,num,name and value fileds.Tinymix displays the following content 

evk_8mq:/storage/emulated/0 # tinymix
Mixer name: 'wm8524-audio'
Number of controls: 0
ctl       type      num       name       value

Can you please provide me some inputs on this?

Regards,

Deexith    

[amber_yeh]

Hello,

The wm8524-codec supports 32000hz, 48000hz, 96000hz and 192000hz.

Some wav files are 44100hz sample rate so you can covert wav files of some frequency to 48000 hz.

Regards,

Yilin

[xiaocong_fu]

Hi Deexith,

Check the sound card using cat /proc/asound/card0/id

if the id is wm8524audio, and you see pcm0p in card0, try to specify device and card using:

tinyplay test.wav -D 0 -d 0

BR,

Xiaocong

[deexithamba]

Hello,

I had tried the same way even then the output remains the same!! To make it clear, following are the logs;

evk_8mq:/proc/asound/card0 # ls
id pcm0p
evk_8mq:/proc/asound/card0 # cat id
wm8524audio

evk_8mq:/proc/asound/card0 # tinyplay /storage/emulated/0/Download/testw1.wav -D 0 -d 0
Unable to open PCM device 0 (cannot set hw params: Invalid argument)

Regards,

Deexith 

[diegoadrian]

Hello,

The WM8524 audio codec is used on iMX8M EVK, this codec is very simple, it supports less feature. From the error log "cannot set hw params: Invalid argument", it shows tinyplay had set unsupported parameters to the driver.

From driver code, sound\soc\fsl\imx-wm8524.c, the driver only supports ".hw_params" interface, no other controller interface. You can add debug code to find, is there an error in function imx_hifi_hw_params().

Furthermore, can you please share the complete log that you have? I need it to see what exactly is causing the problem.

Best Regards,

Diego.