1#@!#!123s

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Filename : audio.stp
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# systemtap audio tapset
# Copyright (C) 2008 Masami Hiramatsu <masami.hiramatsu@gmail.com>
# 
# This file is free software and is distributed under the terms of the GNU
# General Public License (GPL); either version 2, or (at your option) any
# later version.

%{
#include <linux/vt_kern.h>
%}

%( kernel_v >= "2.6.25" %? 
function game_beep(hz:long, ms:long)
%{
  unsigned int tick = msecs_to_jiffies((unsigned int)THIS->ms);
  kd_mksound((unsigned int)THIS->hz, tick);
%}
%)

function game_nobeep()
{
  game_beep(0,0)
}

global __GM_scale
global __GM_merody
global __GM_merody_nth
global __GM_merody_seq
global __GM_merody_cnt

probe begin(-1001) {
  __GM_scale["c"]  = 262
  __GM_scale["c+"] = 277
  __GM_scale["d"]  = 294
  __GM_scale["d+"] = 311
  __GM_scale["e"]  = 330
  __GM_scale["f"]  = 349
  __GM_scale["f+"] = 370
  __GM_scale["g"]  = 392
  __GM_scale["g+"] = 415
  __GM_scale["a"]  = 440
  __GM_scale["a+"] = 466
  __GM_scale["b"]  = 494
  delete __GM_merody
}

function game_tone(tone:string, nth:long, ms:long)
{
  if ([tone] in __GM_scale) {
    tone2 = __GM_scale[tone];
    for (i=0;i<nth-3;i++) tone2*=2
    for (i=0;i>nth-3;i--) tone2/=2
    game_beep(tone2, ms)
  }
}

function game_merody(merody:string)
{
  i = 0
  delete __GM_merody
  c = tokenize(merody, " ")
  while (c != "") {
   __GM_merody[i, 0] = c
   c = tokenize("",",")
   __GM_merody[i, 1] = c
   c = tokenize(""," ")
   i++
  }
  __GM_merody_seq = 0
  __GM_merody_nth = 3
  __GM_merody_cnt = 1
}

probe timer.ms(64) {
  if (__GM_merody_cnt-- > 0) next;
  seq = __GM_merody_seq;
  while ([seq, 0] in __GM_merody) {
    c = __GM_merody[seq, 0]
    l = strtol(__GM_merody[seq, 1], 10)
    seq++
    if (c == ">") {
	__GM_merody_nth += l
    } else if (c == "<" ) {
	__GM_merody_nth -= l
    } else {
        break;
    }
  }
  game_tone(c, __GM_merody_nth, l*64)
  __GM_merody_cnt = l
  __GM_merody_seq = seq
}