cdrom: try some different seek times

libretro/pcsx_rearmed#781
libretro/pcsx_rearmed#150

diff --git a/libpcsxcore/cdrom.c b/libpcsxcore/cdrom.c
index bc973e9..fd09c7e 100644 (file)
--- a/libpcsxcore/cdrom.c
+++ b/libpcsxcore/cdrom.c
@@ -448,11 +448,11 @@ static int ReadTrack(const u8 *time)
        tmp[1] = itob(time[1]);
        tmp[2] = itob(time[2]);
 
+       CDR_LOG("ReadTrack *** %02x:%02x:%02x\n", tmp[0], tmp[1], tmp[2]);
+
        if (memcmp(cdr.Prev, tmp, 3) == 0)
                return 1;
 
-       CDR_LOG("ReadTrack *** %02x:%02x:%02x\n", tmp[0], tmp[1], tmp[2]);
-
        read_ok = CDR_readTrack(tmp);
        if (read_ok)
                memcpy(cdr.Prev, tmp, 3);
@@ -560,14 +560,21 @@ static int cdrSeekTime(unsigned char *target)
 {
        int diff = msf2sec(cdr.SetSectorPlay) - msf2sec(target);
        int seekTime = abs(diff) * (cdReadTime / 2000);
+       int cyclesSinceRS = psxRegs.cycle - cdr.LastReadSeekCycles;
        seekTime = MAX_VALUE(seekTime, 20000);
 
        // need this stupidly long penalty or else Spyro2 intro desyncs
-       if ((s32)(psxRegs.cycle - cdr.LastReadSeekCycles) > cdReadTime * 8)
+       // note: if misapplied this breaks MGS cutscenes among other things
+       if (cyclesSinceRS > cdReadTime * 50)
                seekTime += cdReadTime * 25;
+       // Transformers Beast Wars Transmetals does Setloc(x),SeekL,Setloc(x),ReadN
+       // and then wants some slack time
+       else if (cyclesSinceRS < cdReadTime *3/2)
+               seekTime += cdReadTime;
 
        seekTime = MIN_VALUE(seekTime, PSXCLK * 2 / 3);
-       CDR_LOG("seek: %.2f %.2f\n", (float)seekTime / PSXCLK, (float)seekTime / cdReadTime);
+       CDR_LOG("seek: %.2f %.2f (%.2f)\n", (float)seekTime / PSXCLK,
+               (float)seekTime / cdReadTime, (float)cyclesSinceRS / cdReadTime);
        return seekTime;
 }
 
@@ -1191,11 +1198,11 @@ void cdrInterrupt(void) {
                        // FALLTHROUGH
 
                set_error:
-                       CDR_LOG_I("cmd %02x error %02x\n", Cmd, error);
                        SetResultSize(2);
                        cdr.Result[0] = cdr.StatP | STATUS_ERROR;
                        cdr.Result[1] = not_ready ? ERROR_NOTREADY : error;
                        cdr.Stat = DiskError;
+                       CDR_LOG_I("cmd %02x error %02x\n", Cmd, cdr.Result[1]);
                        break;
        }