1 files changed, 47 insertions, 0 deletions
diff --git a/src/fake86/speaker.c b/src/fake86/speaker.c
new file mode 100755
index 0000000..df3e651
--- /dev/null
+++ b/src/fake86/speaker.c
@@ -0,0 +1,47 @@
+/*
+  Fake86: A portable, open-source 8086 PC emulator.
+  Copyright (C)2010-2013 Mike Chambers
+
+  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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+*/
+
+/* speaker.c: function to generate output samples for PC speaker emulation. */
+
+#include "config.h"
+#include <stdint.h>
+#include "i8253.h"
+#include "mutex.h"
+
+extern struct i8253_s i8253;
+
+extern uint64_t gensamplerate;
+uint64_t speakerfullstep, speakerhalfstep, speakercurstep = 0;
+int16_t speakerpos = 0;
+
+int16_t speakergensample() {
+	int16_t speakervalue;
+
+	speakerfullstep = (uint64_t) ( (float) gensamplerate / (float) i8253.chanfreq[2]);
+	if (speakerfullstep < 2) speakerfullstep = 2;
+	speakerhalfstep = speakerfullstep >> 1;
+	if (speakercurstep < speakerhalfstep) {
+			speakervalue = 32;
+		}
+	else {
+			speakervalue = -32;
+		}
+	speakercurstep = (speakercurstep + 1) % speakerfullstep;
+	return (speakervalue);
+}