snd_mixer_selem_channel_id_t

type snd_mixer_selem_channel_id_t = (

  SND_MIXER_SCHN_UNKNOWN = - 1,

  SND_MIXER_SCHN_FRONT_LEFT = 0,

  SND_MIXER_SCHN_FRONT_RIGHT,

  SND_MIXER_SCHN_REAR_LEFT,

  SND_MIXER_SCHN_REAR_RIGHT,

  SND_MIXER_SCHN_FRONT_CENTER,

  SND_MIXER_SCHN_WOOFER,

  SND_MIXER_SCHN_SIDE_LEFT,

  SND_MIXER_SCHN_SIDE_RIGHT,

  SND_MIXER_SCHN_REAR_CENTER,

  SND_MIXER_SCHN_LAST = 31,

  SND_MIXER_SCHN_MONO = SND_MIXER_SCHN_FRONT_LEFT

);