snd_spcm_init_duplex

function snd_spcm_init_duplex(

  playback_pcm: Psnd_pcm_t;

  capture_pcm: Psnd_pcm_t;

  rate: cuint;

  channels: cuint;

  format: snd_pcm_format_t;

  subformat: snd_pcm_subformat_t;

  latency: snd_spcm_latency_t;

  _access: snd_pcm_access_t;

  xrun_type: snd_spcm_xrun_type_t;

  duplex_type: snd_spcm_duplex_type_t

):cint;