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snd_pcm_writei

Li Michelle
Expert 1335 points


Hi, we use DM8168, RDK4.0, AIC3101.

snd_pcm_writei() can block the playback thread? How can I handle it?

Thanks very much.

  • 0
    TI__Expert 6950 points

    You can use alsa - non blocking mode. Refer to some alsa sample app for usage.

  • 0 in reply to Sivagamy Govindasamy
    Expert 1335 points

    Is there any API which can check the alsa driver or AIC status?

    And what the circumstance snd_pcm_prepare will not return and block the  thread.

  • 0 in reply to Li Michelle
    TI__Expert 6950 points

    1. Does snd_pcm_writei() blocks forever?  Run aplay to see if your playback works fine; if so then it could be you app problem. If it never returns, then there could be something at driver level. Does this happen in standard dvr rdk demo app?

    2. If there is no permanent hang issue with snd_pcm_writei() & you want to NOT use blocking mode in your playback thread, refer these

    - dvrapp (UDWorks GUI App) has a sample implementation of non block mode.

    - dvr console demo has an MMAP based implementation (which is not enabled by default) which has a kind of non blocking implementation.

    - refer to alsa examples which talk about async handlers