Mixer group ID structure
typedef struct
{
    int32_t     type;
    char        name[32];
    int32_t     index;
    uint8_t     reserved[124];      /* must be filled with zeroes */
    int32_t     weight;
}       snd_mixer_gid_t;
The snd_mixer_gid_t structure describes a mixer group's ID. The members include:
QNX Neutrino