Alsa tool to get audio sound card parameters.

Usage: mxc_alsa_hw_params.out <device> <substream> <attribute>
<device>    : the audio device like hw:0,0
<substeam>  : p is the playback substream
            : c is the capture substream
<attribute> : f to get the supported format list;
              r to get the supported rate list;
              c to get the supported channel list
For example: mxc_alsa_hw_params.out hw:0,0 p r
