From 9470c9f66131d16ca19d111d21948ba57a1a8eb3 Mon Sep 17 00:00:00 2001
From: Max Horn
Date: Thu, 18 Sep 2003 16:01:33 +0000
Subject: changed & documented the premixer semantics

svn-id: r10294
---
 backends/midi/adlib.cpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'backends')

diff --git a/backends/midi/adlib.cpp b/backends/midi/adlib.cpp
index 2205c56589..efd412235e 100644
--- a/backends/midi/adlib.cpp
+++ b/backends/midi/adlib.cpp
@@ -866,7 +866,7 @@ int MidiDriver_ADLIB::open() {
 
 	_samples_per_tick = (_mixer->getOutputRate() << FIXP_SHIFT) / BASE_FREQ;
 
-	_mixer->setupPremix(this, premix_proc);
+	_mixer->setupPremix(premix_proc, this);
 	
 	return 0;
 }
@@ -1014,6 +1014,9 @@ void MidiDriver_ADLIB::adlib_write(byte port, byte value) {
 void MidiDriver_ADLIB::generate_samples(int16 *data, int len) {
 	int step;
 
+	int16 *origData = data;
+	uint origLen = len;
+
 	do {
 		step = len;
 		if (step > (_next_tick >> FIXP_SHIFT))
@@ -1030,6 +1033,11 @@ void MidiDriver_ADLIB::generate_samples(int16 *data, int len) {
 		data += step;
 		len -= step;
 	} while (len);
+
+	// Convert mono data to stereo
+	for (int i = (origLen - 1); i >= 0; i--) {
+		origData[2 * i] = origData[2 * i + 1] = origData[i];
+	}
 }
 
 void MidiDriver_ADLIB::reset_tick() {
-- 
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