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Added a function that returns the number of active voices
Related to issue #27

--- a/tsf.h

+++ b/tsf.h

@@ -148,6 +148,9 @@

 // Stop playing all notes (end with sustain and release)

 TSFDEF void tsf_note_off_all(tsf* f);

+// Returns the number of active voices

+TSFDEF int tsf_active_voice_count(tsf* f);

+

 // Render output samples into a buffer

 // You can either render as signed 16-bit values (tsf_render_short) or

 // as 32-bit float values (tsf_render_float)

@@ -914,7 +917,6 @@

 static void tsf_voice_kill(struct tsf_voice* v)

 {

-	v->region = TSF_NULL;

 	v->playingPreset = -1;

 }

@@ -1338,6 +1340,14 @@

 	struct tsf_voice *v = f->voices, *vEnd = v + f->voiceNum;

 	for (; v != vEnd; v++) if (v->playingPreset != -1 && v->ampenv.segment < TSF_SEGMENT_RELEASE)

 		tsf_voice_end(v, f->outSampleRate);

+}

+

+TSFDEF int tsf_active_voice_count(tsf* f)

+{

+	int count = 0;

+	struct tsf_voice *v = f->voices, *vEnd = v + f->voiceNum;

+	for (; v != vEnd; v++) if (v->playingPreset != -1) count++;

+	return count;

 }

 TSFDEF void tsf_render_short(tsf* f, short* buffer, int samples, int flag_mixing)