song.c

   1 /*
   2
   3     Ann Hell Ex Machina - Music Software
   4     Copyright (C) 2003/2005 Angel Ortega <angel@triptico.com>
   5
   6     song.c - Device-independent song event stream management
   7
   8     This program is free software; you can redistribute it and/or
   9     modify it under the terms of the GNU General Public License
  10     as published by the Free Software Foundation; either version 2
  11     of the License, or (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License
  19     along with this program; if not, write to the Free Software
  20     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21
  22     http://www.triptico.com
  23
  24 */
  25
  26 #include "config.h"
  27
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <math.h>
  32
  33 #include "ss_core.h"
  34 #include "song.h"
  35
  36 /*******************
  37         Data
  38 ********************/
  39
  40 /* the song event stream */
  41 union song_ev * _song=NULL;
  42
  43 /* number of song events */
  44 int _n_song_ev=0;
  45
  46 /*******************
  47         Code
  48 ********************/
  49
  50 /**
  51  * song_clear - Clears the song stream
  52  *
  53  * Clears the song stream.
  54  */
  55 void song_clear(void)
  56 {
  57         if(_song != NULL)
  58         {
  59                 free(_song);
  60                 _song=NULL;
  61         }
  62
  63         _n_song_ev=0;
  64 }
  65
  66
  67 /**
  68  * add_song_ev - Adds a song event to the song stream
  69  * @ev: the event
  70  *
  71  * Adds a song event to the song stream.
  72  */
  73 void add_song_ev(union song_ev * ev)
  74 {
  75         _n_song_ev++;
  76
  77         /* reallocs */
  78         _song=(union song_ev *)realloc(_song,
  79                 _n_song_ev * sizeof(union song_ev));
  80
  81         /* store */
  82         memcpy(&_song[_n_song_ev - 1], ev, sizeof(union song_ev));
  83 }
  84
  85
  86 static int song_ev_cmp(const void * v1, const void * v2)
  87 {
  88         struct song_ev_generic * e1;
  89         struct song_ev_generic * e2;
  90
  91         e1=(struct song_ev_generic *)v1; e2=(struct song_ev_generic *)v2;
  92
  93         if(e1->time == e2->time)
  94                 return(e1->type - e2->type);
  95
  96         return(e1->time - e2->time);
  97 }
  98
  99
 100 /**
 101  * song_sort - Sorts the song stream
 102  *
 103  * Sorts the song stream.
 104  */
 105 void song_sort(void)
 106 {
 107         qsort(_song, _n_song_ev, sizeof(union song_ev), song_ev_cmp);
 108 }