From: kub <derkub@gmail.com>
Date: Thu, 3 Jun 2021 19:51:47 +0000 (+0200)
Subject: mcd, fix pcm output level
X-Git-Tag: v2.00~517
X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cce32a34da6b18ead5e0808471f666196ea53513;p=picodrive.git

mcd, fix pcm output level
---

diff --git a/pico/cd/pcm.c b/pico/cd/pcm.c
index b77196a4..795ec3b7 100644
--- a/pico/cd/pcm.c
+++ b/pico/cd/pcm.c
@@ -89,10 +89,10 @@ void pcd_pcm_sync(unsigned int to)
 
     addr = ch->addr;
     inc = ch->regs[2] + (ch->regs[3]<<8);
-    mul_l = ((int)ch->regs[0] * (ch->regs[1] & 0xf)) >> (5+1); 
-    mul_r = ((int)ch->regs[0] * (ch->regs[1] >>  4)) >> (5+1);
+    mul_l = (int)ch->regs[0] * (ch->regs[1] & 0xf); 
+    mul_r = (int)ch->regs[0] * (ch->regs[1] >>  4);
 
-    for (s = 0; s < steps; s++, addr = (addr + inc) & 0x7FFFFFF)
+    for (s = 0; s < steps; s++, addr = (addr + inc) & 0x07FFFFFF)
     {
       smp = Pico_mcd->pcm_ram[addr >> PCM_STEP_SHIFT];
 
@@ -109,8 +109,8 @@ void pcd_pcm_sync(unsigned int to)
       if (smp & 0x80)
         smp = -(smp & 0x7f);
 
-      out[s*2  ] += smp * mul_l; // max 128 * 119 = 15232
-      out[s*2+1] += smp * mul_r;
+      out[s*2  ] += (smp * mul_l) >> 5; // max 127 * 255 * 15 / 32 = 15180
+      out[s*2+1] += (smp * mul_r) >> 5;
     }
     ch->addr = addr;
   }