From: kub <derkub@gmail.com>
Date: Fri, 28 Mar 2025 22:02:40 +0000 (+0100)
Subject: mcd, improve pcm save state
X-Git-Tag: v2.04~8
X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e6bb77d1a1770882dbae14dce70fa9d4de19b0f7;p=picodrive.git

mcd, improve pcm save state
---

diff --git a/pico/cd/mcd.c b/pico/cd/mcd.c
index 9476f501..4140f20a 100644
--- a/pico/cd/mcd.c
+++ b/pico/cd/mcd.c
@@ -442,7 +442,6 @@ PICO_INTERNAL void PicoFrameMCD(void)
 void pcd_state_loaded(void)
 {
   unsigned int cycles;
-  int diff;
 
   pcd_state_loaded_mem();
 
@@ -453,7 +452,7 @@ void pcd_state_loaded(void)
 
   // old savestates..
   cycles = pcd_cycles_m68k_to_s68k(Pico.t.m68c_aim);
-  if (CYCLES_GE(cycles - SekCycleAimS68k, 1000)) {
+  if (CYCLES_GE(cycles - SekCycleAimS68k, 12500000/60)) {
     SekCycleCntS68k = SekCycleAimS68k = cycles;
   }
   if (pcd_event_times[PCD_EVENT_CDC] == 0) {
@@ -464,8 +463,7 @@ void pcd_state_loaded(void)
         (Pico_mcd->s68k_regs[0x31]+1) * 384);
   }
 
-  diff = cycles - Pico_mcd->pcm.update_cycles;
-  if ((unsigned int)diff > 12500000/50)
+  if (CYCLES_GE(cycles - Pico_mcd->pcm.update_cycles, 12500000/50))
     Pico_mcd->pcm.update_cycles = cycles;
 
   if (Pico_mcd->m.need_sync) {
diff --git a/pico/cd/pcm.c b/pico/cd/pcm.c
index b38ce2d6..abb65f6c 100644
--- a/pico/cd/pcm.c
+++ b/pico/cd/pcm.c
@@ -62,7 +62,7 @@ void pcd_pcm_sync(unsigned int to)
   if ((int)(to - cycles) < 384)
     return;
 
-  steps = (to - cycles) / 384;
+  steps = (to - cycles) * ((1LL << 32) / 384) >> 32;
   if (Pico_mcd->pcm_mixpos + steps > PCM_MIXBUF_LEN)
     // shouldn't happen, but occasionally does
     steps = PCM_MIXBUF_LEN - Pico_mcd->pcm_mixpos;
@@ -147,7 +147,7 @@ void pcd_pcm_update(s32 *buf32, int length, int stereo)
   else {
     while (length-- > 0) {
       // mostly unused
-      *buf32++ += pcm[0];
+      *buf32++ += (pcm[0] + pcm[1]) >> 1;
 
       p += step;
       pcm += (p >> 16) * 2;