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Audio testing fails with tinyplay command on i.MX8M EVK

Question asked by deexithamba@gmail.com on Dec 5, 2018
Latest reply on Jan 23, 2019 by Yi-Lin Yeh

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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

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Xiaocong Fu Dec 5, 2018 6:48 PM
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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
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- deexithamba@gmail.com @ Xiaocong Fu on Dec 5, 2018 9:47 PM
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  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
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  - Diego Adrian Cuevas @ deexithamba@gmail.com on Dec 18, 2018 8:09 AM
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    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.
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Yi-Lin Yeh Jan 23, 2019 8:45 PM
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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
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Audio testing fails with tinyplay command on i.MX8M EVK

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