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Audio Ouptut issue on DM365

Dilip Patel12044
Prodigy 225 points

Hi,

 

I am getting the error in write call. I am just redirect file to audio output device.

First I captured the audio data using cat /dev/dsp > test then play that file using below command getting error during write call.

root@10.100.1.172:/home# cat test > /dev/dsp
cat: write error: Input/output error

I am getting same issue in my application and I am using OSS driver IOCTL.

Please advice me how to resolve this issue.

Thanks,

Dilip

  • 0
    TI__Mastermind 37340 points

    Dilip,

    I do not have DM365 software installed to test this out myself, but plan on isntalling it soon if someone else does not chime-in to help offer an explanation.  However, I would recommend you moving away from using /dev/dsp for develpment phase; this is legacy OSS stuff that is being depracated in favor of ALSA.  DM365 uses kernel 2.6.18 which supports ALSA with OSS emulation layer; however, we do not claim we support OSS emulation layer in our literature because this support goes away in newer kernels; therefore as TI and our customer migrate to newer kernels OSS support will disappear; I just wanted to make you aware of this so you do not spend too much time developing for OSS only to find out you will need to re-write code for ALSA in the future...

  • 0
    TI__Mastermind 41665 points

    Juan is correct that in general you should be using ALSA as the OSS support is being deprecated and may or may not work in future releases.

    On a more positive note I tried this out on my board and I was able to record and play back a test audio file through the /dev/dsp OSS adapter, I tried this out on both PSP_02_10_00_14 and PSP_02_10_00_11 kernels with success, what software versions are you running? Do you have any modifications?

  • 0 in reply to Bernie Thompson TI
    Prodigy 225 points

    Hi,

    I am using dvsdk_2_10_00_14 and lsp_2_10_11.

    I observed it by running multiple time cat <audio file>  > /dev/dsp. I tried it 5 to 10 times.

    No, I did not modified any thing.

     

     

     

     

  • 0 in reply to Dilip Patel12044
    TI__Mastermind 41665 points

    I tested this out a few more times and I was able to get the i/o error a couple of times going through various sequences of reading in audio data and playing it back out, based on this I assume that you are only getting this error intermittently?

    Unfortunately there may not be an immediate fix for this, as it sounds like a bug (I don't think we could be doing anything wrong here), and because of the upcoming ALSA migration there is a possibility that this will not be fixed, however I will pass the issue on internally and let you know what I hear back.

  • 0 in reply to Bernie Thompson TI
    Intellectual 610 points

    Hi,

    We havet this bug, too.

    How the progressing for this issue?

    Regards,

    Person

  • 0 in reply to Person Lin
    TI__Mastermind 41665 points

    I don't believe this issue was ever fixed, and I don't believe it will be at this point, the recommendation would be to use ALSA (for example aplay, arecord) in place of OSS which used /dev/dsp. Even in the far newer DVSDK 3.10 for DM365 the /dev/dsp OSS emulation layer does not seem to work properly, though it gives no error, it does not return or output any audio data.