Checks which audio input sample formats are supported.


Checks which sample formats are supported by the current audio input driver, returning one of the bitfield values:
      0 = audio input not supported
      8 = eight bit audio input is supported
      16 = sixteen bit audio input is supported
      24 = both eight and sixteen bit audio input are supported
      cap = get_sound_input_cap_bits();
      if (cap == 0) {
	 /* Ugh, no audio input supported? */
      } else {
	 if (cap & 8) {
	    /* We have eight bit audio input. */
	 if (cap & 16) {
	    /* We have sixteen bit audio input. */

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