From 5ab70ff91fd1917543b09c8565de8a951de0a39c Mon Sep 17 00:00:00 2001
From: tildearrow <me@tildearrow.org>
Date: Sun, 26 Nov 2023 18:50:22 -0500
Subject: [PATCH] PCM DAC: fix possible overflow in linear interpola

---
 src/engine/platform/pcmdac.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/engine/platform/pcmdac.cpp b/src/engine/platform/pcmdac.cpp
index 1ddd22dae..adc8770ee 100644
--- a/src/engine/platform/pcmdac.cpp
+++ b/src/engine/platform/pcmdac.cpp
@@ -67,7 +67,7 @@ void DivPlatformPCMDAC::acquire(short** buf, size_t len) {
 
         switch (interp) {
           case 1: // linear
-            output=s6+((s7-s6)*(chan[0].audSub&0xffff)>>16);
+            output=s6+(((int)((int)s7-(int)s6)*((chan[0].audSub>>1)&0x7fff))>>15);
             break;
           case 2: { // cubic
             float* cubicTable=DivFilterTables::getCubicTable();
@@ -188,7 +188,7 @@ void DivPlatformPCMDAC::acquire(short** buf, size_t len) {
 
         switch (interp) {
           case 1: // linear
-            output=s6+((s7-s6)*(chan[0].audSub&0xffff)>>16);
+            output=s6+(((int)((int)s7-(int)s6)*((chan[0].audSub>>1)&0x7fff))>>15);
             break;
           case 2: { // cubic
             float* cubicTable=DivFilterTables::getCubicTable();