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nes: fds: make some slight adjustments to audio based on new information. ai senshi nicol still sounds like a cheese grater

This commit is contained in:
goyuken 2014-01-26 17:09:08 +00:00
parent f734665f67
commit 704d269073
1 changed files with 16 additions and 10 deletions
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26
BizHawk.Emulation.Cores/Consoles/Nintendo/NES/FDS/FDSAudio.cs
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@ -4,7 +4,7 @@ using BizHawk.Common;
namespace BizHawk.Emulation.Cores.Nintendo.NES
{
// http://wiki.nesdev.com/w/index.php/FDS_audio
public class FDSAudio //: IDisposable
public class FDSAudio
{
public void SyncState(Serializer ser)
{
@ -155,25 +155,31 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
void CalcMod()
{
// really don't quite get this...
// http://forums.nesdev.com/viewtopic.php?f=3&t=10233
int tmp = sweepbias * sweepgain;
if ((tmp & 0xf) != 0)
int remainder = tmp & 15;
tmp >>= 4;
if (remainder > 0 && (tmp & 0x80) == 0)
{
tmp /= 16;
if (sweepbias < 0)
tmp -= 1;
else
tmp += 2;
}
else
tmp /= 16;
if (tmp > 193)
tmp -= 258;
// signed with unconventional bias
if (tmp >= 192)
tmp -= 256;
else if (tmp < -64)
tmp += 256;
modoutput = frequency * tmp / 64;
// round to nearest
tmp *= frequency;
remainder = tmp & 63;
tmp >>= 6;
if (remainder >= 32)
tmp++;
modoutput = tmp;
}
void CalcOut()
@ -299,7 +305,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
r4084_7 = (value & 0x80) != 0;
break;
case 0x4085:
modtablepos = 0; // reset
//modtablepos = 0; // this doesn't happen, ever!!
sweepbias = value & 0x7f;
// sign extend
sweepbias <<= 25;