About sound driver\'s properties ...

who can tell me how can i use ioctl syscall to modify /dev/audio or /dev/dsp\'s default properties, such as channal, rate and so on ...

i want to play some raw sound data. such as this:
void Play()
{
    int od, id;
    id = open( \"myrawsounddata\", O_RDONLY );
    od = open( \"/dev/audio\", O_WRONLY );

    ioctl( od, /* i don\'t know how to ... */ );

    char buf[1024];
    int n;
    while((n = read(id, buf, 1024) > 0)
    {
        write(od, buf, n);
    }
    
    close(id);
    close(od);
}

i have read some sound driver\'s source code of kernel. but i cannot understand it ...

thanks!