[alsa-devel] external PCM plugin, can't read hw params

Ben C bchang_2 at yahoo.com
Mon Feb 11 03:30:43 CET 2008


This is during the init call-back of an external PCM plugin.

I'm trying to read the period size. The code is pretty basic, it looks like this:

    status = snd_pcm_hw_params_any(ext->pcm, hw);
    if (status < 0)
        // some error handling

    status = snd_pcm_hw_params_get_period_size(hw, size, NULL);
    if (status < 0)
        // some error handling

I get size = 0 back, an no errors either. Other information that I needed, such as the rate & format are available in the ext structure, but not the period size. So I query the hw params of ext->pcm. Please let me know if I should be getting this information using a different way.

alsa-lib version is 1.0.14a

I've done something similar for alsa-lib verion 1.0.13 (I used snd_pcm_hw_params_current() call) which worked. This is based on that same code but for a different target.

Thank you,

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