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BizHawk
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gameboy - use blip_buf for audio resampling, like NES. this is also something that dual GB does, but i never got around to porting it back to single GB before. the speexresampler is very good for some things, like snes, but isn't appropriate for multi-megahertz audio downsampling. 

big speedup.
This commit is contained in:
goyuken 2013-10-21 17:19:37 +00:00
parent b284f5b5e4
commit 5afcb1b168
1 changed files with 51 additions and 9 deletions
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60
BizHawk.Emulation/Consoles/Nintendo/Gameboy/Gambatte.cs
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@ -194,9 +194,14 @@ namespace BizHawk.Emulation.Consoles.GB
LibGambatte.gambatte_runfor(GambatteState, VideoBuffer, 160, soundbuff, ref nsamp);
if (rendersound)
{
soundbuffcontains = (int)nsamp;
ProcessSound();
}
else
{
soundbuffcontains = 0;
}
FrameAdvancePost();
}
@ -777,7 +782,7 @@ namespace BizHawk.Emulation.Consoles.GB
#region ISoundProvider
public ISoundProvider SoundProvider { get { return null; } }
public ISyncSoundProvider SyncSoundProvider { get { return dcfilter; } }
public ISyncSoundProvider SyncSoundProvider { get { return this; } }
public bool StartAsyncSound() { return false; }
public void EndAsyncSound() { }
@ -790,21 +795,58 @@ namespace BizHawk.Emulation.Consoles.GB
/// </summary>
int soundbuffcontains = 0;
Sound.Utilities.SpeexResampler resampler;
Sound.Utilities.DCFilter dcfilter;
int soundoutbuffcontains = 0;
short[] soundoutbuff = new short[2048];
int latchaudio = 0;
//Sound.Utilities.SpeexResampler resampler;
//Sound.Utilities.DCFilter dcfilter;
Sound.Utilities.BlipBuffer blip;
void ProcessSound()
{
for (uint i = 0; i < soundbuffcontains; i++)
{
int curr = soundbuff[i * 2];
if (curr != latchaudio)
{
int diff = latchaudio - curr;
latchaudio = curr;
blip.AddDelta(i, diff);
}
}
blip.EndFrame((uint)soundbuffcontains);
soundoutbuffcontains = blip.SamplesAvailable();
blip.ReadSamples(soundoutbuff, soundoutbuffcontains, true);
for (int i = 0; i < soundoutbuffcontains * 2; i += 2)
soundoutbuff[i + 1] = soundoutbuff[i];
soundbuffcontains = 0;
}
void InitSound()
{
resampler = new Sound.Utilities.SpeexResampler(2, 2097152, 44100, 2097152, 44100, null, this);
//resampler = new Sound.Utilities.SpeexResampler(2, 2097152, 44100, 2097152, 44100, null, this);
//dcfilter = Sound.Utilities.DCFilter.AsISyncSoundProvider(resampler, 65536);
// lowpass filtering on an actual GB was probably pretty aggressive?
dcfilter = Sound.Utilities.DCFilter.AsISyncSoundProvider(resampler, 2048);
//dcfilter = Sound.Utilities.DCFilter.AsISyncSoundProvider(resampler, 2048);
blip = new Sound.Utilities.BlipBuffer(1024);
blip.SetRates(2097152, 44100);
}
void DisposeSound()
{
resampler.Dispose();
resampler = null;
blip.Dispose();
blip = null;
//resampler.Dispose();
//resampler = null;
}
public void DiscardSamples()
@ -814,8 +856,8 @@ namespace BizHawk.Emulation.Consoles.GB
public void GetSamples(out short[] samples, out int nsamp)
{
samples = soundbuff;
nsamp = soundbuffcontains;
samples = soundoutbuff;
nsamp = soundoutbuffcontains;
}
#endregion