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libsnes sound is functioning. very quick, very dirty

This commit is contained in:
goyuken 2012-09-04 01:21:14 +00:00
parent ff8a58a9b7
commit 25e213f157
1 changed files with 87 additions and 5 deletions
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92
BizHawk.Emulation/Consoles/Nintendo/SNES/LibsnesCore.cs
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@ -37,9 +37,11 @@ namespace BizHawk.Emulation.Consoles.Nintendo.SNES
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
public delegate void snes_video_refresh_t(ushort *data, int width, int height);
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
public delegate void snes_input_poll_t();
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
public delegate void snes_input_poll_t();
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
public delegate ushort snes_input_state_t(int port, int device, int index, int id);
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
public delegate void snes_audio_sample_t(ushort left, ushort right);
[DllImport("snes.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern void snes_set_video_refresh(snes_video_refresh_t video_refresh);
@ -47,6 +49,8 @@ namespace BizHawk.Emulation.Consoles.Nintendo.SNES
public static extern void snes_set_input_poll(snes_input_poll_t input_poll);
[DllImport("snes.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern void snes_set_input_state(snes_input_state_t input_state);
[DllImport("snes.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern void snes_set_audio_sample(snes_audio_sample_t audio_sample);
public enum Device : uint
{
@ -79,7 +83,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo.SNES
//TODO - libsnes needs to be modified to support multiple instances
//TODO - rename snes.dll so nobody thinks it's a stock snes.dll (we'll be editing it substantially at some point)
public unsafe class LibsnesCore : IEmulator, IVideoProvider
public unsafe class LibsnesCore : IEmulator, IVideoProvider, ISoundProvider
{
static LibsnesCore()
{
@ -90,6 +94,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo.SNES
{
LibsnesDll.snes_term();
_gc_snes_video_refresh.Free();
_gc_snes_audio_sample.Free();
}
public LibsnesCore(byte[] romData)
@ -114,7 +119,11 @@ namespace BizHawk.Emulation.Consoles.Nintendo.SNES
var inputcb = new LibsnesDll.snes_input_state_t(snes_input_state);
_gc_snes_input_state = GCHandle.Alloc(inputcb);
BizHawk.Emulation.Consoles.Nintendo.SNES.LibsnesDll.snes_set_input_state(inputcb);
var soundcb = new LibsnesDll.snes_audio_sample_t(snes_audio_sample);
_gc_snes_audio_sample = GCHandle.Alloc(soundcb);
BizHawk.Emulation.Consoles.Nintendo.SNES.LibsnesDll.snes_set_audio_sample(soundcb);
LibsnesDll.snes_power();
}
@ -195,7 +204,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo.SNES
int vidWidth=256, vidHeight=256;
public IVideoProvider VideoProvider { get { return this; } }
public ISoundProvider SoundProvider { get { return new NullSound(); } }
public ISoundProvider SoundProvider { get { return this; } }
public ControllerDefinition ControllerDefinition { get { return SNESController; } }
IController controller;
@ -238,5 +247,78 @@ namespace BizHawk.Emulation.Consoles.Nintendo.SNES
// ----- Client Debugging API stuff -----
public IList<MemoryDomain> MemoryDomains { get { return new List<MemoryDomain>(); } }
public MemoryDomain MainMemory { get { return new MemoryDomain(); } }
Queue<short> AudioBuffer = new Queue<short>();
GCHandle _gc_snes_audio_sample;
void snes_audio_sample(ushort left, ushort right)
{
AudioBuffer.Enqueue((short)left);
AudioBuffer.Enqueue((short)right);
}
/// <summary>
/// basic linear audio resampler. sampling rate is inferred from buffer sizes
/// </summary>
/// <param name="input">stereo s16</param>
/// <param name="output">stereo s16</param>
static void LinearDownsampler(short[] input, short[] output)
{
// TODO - this also appears in YM2612.cs ... move to common if it's found useful
double samplefactor = (input.Length - 2) / (double)output.Length;
for (int i = 0; i < output.Length / 2; i++)
{
// exact position on input stream
double inpos = i * samplefactor;
// selected interpolation points and weights
int pt0 = (int)inpos; // pt1 = pt0 + 1
double wt1 = inpos - pt0; // wt0 = 1 - wt1
double wt0 = 1.0 - wt1;
output[i * 2 + 0] = (short)(input[pt0 * 2 + 0] * wt0 + input[pt0 * 2 + 2] * wt1);
output[i * 2 + 1] = (short)(input[pt0 * 2 + 1] * wt0 + input[pt0 * 2 + 3] * wt1);
}
}
public void GetSamples(short[] samples)
{
// resample approximately 32k->44k
int inputcount = samples.Length * 32040 / 44100;
inputcount /= 2;
if (inputcount < 2) inputcount = 2;
short[] input = new short[inputcount * 2];
int i;
for (i = 0; i < inputcount * 2 && AudioBuffer.Count > 0; i++)
input[i] = AudioBuffer.Dequeue();
for (; i < inputcount * 2; i++)
input[i] = 0;
LinearDownsampler(input, samples);
// drop if too many
if (AudioBuffer.Count > samples.Length * 3)
AudioBuffer.Clear();
}
public void DiscardSamples()
{
AudioBuffer.Clear();
}
// ignore for now
public int MaxVolume
{
get;
set;
}
}
}