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DCFilter: allow variable filterwidth. 2600 tia: use a rather aggressive (~172hz cutoff) dc filter. this coefficient is reasonably close to actual hardware behavior.

This commit is contained in:
goyuken 2012-10-10 00:56:48 +00:00
parent ac86041b94
commit 19e5325afa
3 changed files with 9 additions and 5 deletions
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3
BizHawk.Emulation/Consoles/Atari/2600/Atari2600.Core.cs
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@ -13,6 +13,7 @@ namespace BizHawk
public MOS6502X cpu;
public M6532 m6532;
public TIA tia;
public Emulation.Sound.Utilities.DCFilter dcfilter;
public byte[] ram = new byte[128];
public MapperBase mapper;
@ -142,6 +143,8 @@ namespace BizHawk
// Setup TIA
//tia = new TIA(this, frameBuffer);
tia = new TIA(this);
// dcfilter coefficent is from real observed hardware behavior: a latched "1" will fully decay by ~170 or so tia sound cycles
dcfilter = new Emulation.Sound.Utilities.DCFilter(tia, 256);
// Setup 6532
m6532 = new M6532(this);

2
BizHawk.Emulation/Consoles/Atari/2600/Atari2600.cs
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@ -12,7 +12,7 @@ namespace BizHawk
public CoreInputComm CoreInputComm { get; set; }
public CoreOutputComm CoreOutputComm { get; private set; }
public IVideoProvider VideoProvider { get { return tia; } }
public ISoundProvider SoundProvider { get { return tia; } }
public ISoundProvider SoundProvider { get { return dcfilter; } }
public Atari2600(GameInfo game, byte[] rom)
{

9
BizHawk.Emulation/Sound/Utilities/DCFilter.cs
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@ -24,15 +24,16 @@ namespace BizHawk.Emulation.Sound.Utilities
Queue<short> buffer;
const int depth = 65536;
int depth;
/// <summary>
/// if input == null, run in detatched push mode
/// </summary>
/// <param name="input"></param>
public DCFilter(ISoundProvider input = null)
public DCFilter(ISoundProvider input = null, int filterwidth = 65536)
{
this.input = input;
this.depth = filterwidth;
this.buffer = new Queue<short>(depth * 2);
for (int i = 0; i < depth * 2; i++)
buffer.Enqueue(0);
@ -65,8 +66,8 @@ namespace BizHawk.Emulation.Sound.Utilities
sumR += R;
buffer.Enqueue(L);
buffer.Enqueue(R);
int bigL = L - (sumL >> 16); // / depth;
int bigR = R - (sumR >> 16); // / depth;
int bigL = L - sumL / depth;
int bigR = R - sumR / depth;
// check for clipping
if (bigL > 32767)
samples[i] = 32767;