Hej, i'm new on this list as well as to alsa.
We need to find out the supported sampling rates (and other parameters) for the pcm devices of soundcards. We used snd_pcm_hw_params_test_rate() for this, which according to the documentation (http://www.alsa-project.org/alsa-doc/alsa-lib/group___p_c_m___h_w___params.html#a53) should return 1 if the rate is available, 0 otherwise. The problem is that it always returned an non-null value, for any rate even if we knew it wasn't supported. Then we found out that we need to call snd_pcm_hw_params_any() first, and then snd_pcm_hw_params_test_rate() returns 0 for supported rates, and a negativ value (-22) otherwise. Is this the correct way to do the test or did we miss a point ? If it is correct, the documentation should be updated. An additional question, what is the correct way to find out all existing cards/buses on a system ? Currently we scan /proc/asound/card?/ for all pcmX[cp]. Is there a better way to do it ? Thanks, Martin -- Martin Herren Protux - A Free Professional Audio Tool for GNU/Linux: -> http://www.nongnu.org/protux/ Open your Windows - Free your Mind - Enjoy: ->http://gnuwin.epfl.ch
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