snd_pcm_status_get_avail() and external I/O plugins

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Hello,

I have some trouble to get mplayer working with an external pcm I/O plugin 
(a2dp from bluez). The problem is that mplayer needs to know how much space 
is left in the ring buffer:

  snd_pcm_status(alsa_handler, status)
  ret = snd_pcm_status_get_avail(status) * bytes_per_sample;

Now with the ALSA kernel driver, ret will vary, depending on how much data was 
written to the device, and how much time passed.

However, with the I/O plugin, snd_pcm_status_get_avail() always returns the 
maximum value (causing mplayer to think that all samples have been played). I 
can't find a callback function for the status in snd_pcm_ioplug_callback_t 
where I could adjust the avail value.

I'd appreciate any hints.

Robert


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