# HG changeset patch
# User Michael Pavone <pavone@retrodev.com>
# Date 1392151543 28800
# Node ID 7565ec2ac65298f1334e3bca079c01f7dc486b66
# Parent  6e9d1a8c1b083cc9ca8762031f08c6ad529736a4
Fix overflow handling on FM channel output

diff -r 6e9d1a8c1b08 -r 7565ec2ac652 ym2612.c
--- a/ym2612.c	Tue Feb 11 12:45:15 2014 -0800
+++ b/ym2612.c	Tue Feb 11 12:45:43 2014 -0800
@@ -470,9 +470,16 @@
 			context->audio_buffer[context->buffer_pos] = 0;
 			context->audio_buffer[context->buffer_pos + 1] = 0;
 			for (int i = 0; i < NUM_CHANNELS; i++) {
-				int16_t value = context->channels[i].output & 0x3FE0;
-				if (value & 0x2000) {
-					value |= 0xC000;
+				int16_t value = context->channels[i].output;
+				if (value > 0x1FE0) {
+					value = 0x1FE0;
+				} else if (value < -0x1FF0) {
+					value = -0x1FF0;
+				} else {
+					value &= 0x3FE0;
+					if (value & 0x2000) {
+						value |= 0xC000;
+					}
 				}
 				if (context->channels[i].logfile) {
 					fwrite(&value, sizeof(value), 1, context->channels[i].logfile);