+/*
+** Copyright (C) 2007-2011 Erik de Castro Lopo <erikd@mega-nerd.com>
+**
+** This program is free software; you can redistribute it and/or modify
+** it under the terms of the GNU General Public License as published by
+** the Free Software Foundation; either version 2 of the License, or
+** (at your option) any later version.
+**
+** This program is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+** GNU General Public License for more details.
+**
+** You should have received a copy of the GNU General Public License
+** along with this program; if not, write to the Free Software
+** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+#include <sndfile.h>
+
+#include "utils.h"
+#include "generate.h"
+
+#define SF_MAX(x,y) ((x) > (y) ? (x) : (y))
+
+static float crappy_snare (float *output, int len, int offset, float gain, float maxabs) ;
+
+void
+generate_file (const char * filename, int format, int len)
+{ float * output ;
+ float maxabs = 0.0 ;
+
+ output = calloc (len, sizeof (float)) ;
+
+ maxabs = crappy_snare (output, len, 0, 0.95, maxabs) ;
+ maxabs = crappy_snare (output, len, len / 4, 0.85, maxabs) ;
+ maxabs = crappy_snare (output, len, 2 * len / 4, 0.85, maxabs) ;
+ crappy_snare (output, len, 3 * len / 4, 0.85, maxabs) ;
+
+ write_mono_file (filename, format, 44100, output, len) ;
+
+ free (output) ;
+} /* generate_file */
+
+static inline float
+rand_float (void)
+{ return rand () / (0.5 * RAND_MAX) - 1.0 ;
+} /* rand_float */
+
+static float
+crappy_snare (float *output, int len, int offset, float gain, float maxabs)
+{ int k ;
+ float env = 0.0 ;
+
+ for (k = offset ; k < len && env < gain ; k++)
+ { env += 0.03 ;
+ output [k] += env * rand_float () ;
+ maxabs = SF_MAX (maxabs, fabs (output [k])) ;
+ } ;
+
+ for ( ; k < len && env > 1e-8 ; k++)
+ { env *= 0.995 ;
+ output [k] += env * rand_float () ;
+ maxabs = SF_MAX (maxabs, fabs (output [k])) ;
+ } ;
+
+ return maxabs ;
+} /* crappy_snare */