86 lines
2.7 KiB
C#
86 lines
2.7 KiB
C#
using System;
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using System.Runtime.InteropServices;
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using BizHawk.Emulation.Cores.Nintendo.N64;
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namespace BizHawk.Emulation.Cores.Nintendo.N64.NativeApi
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{
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class mupen64plusAudioApi
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{
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/// <summary>
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/// Handle to native audio plugin
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/// </summary>
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private IntPtr AudDll;
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[DllImport("kernel32.dll")]
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public static extern IntPtr GetProcAddress(IntPtr hModule, string procedureName);
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/// <summary>
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/// Gets the size of the mupen64plus audio buffer
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/// </summary>
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/// <returns>The size of the mupen64plus audio buffer</returns>
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[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
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private delegate int GetBufferSize();
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GetBufferSize dllGetBufferSize;
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/// <summary>
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/// Gets the audio buffer from mupen64plus, and then clears it
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/// </summary>
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/// <param name="dest">The buffer to fill with samples</param>
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[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
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private delegate void ReadAudioBuffer(short[] dest);
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ReadAudioBuffer dllReadAudioBuffer;
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/// <summary>
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/// Gets the current audio rate from mupen64plus
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/// </summary>
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/// <returns>The current audio rate</returns>
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[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
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private delegate int GetAudioRate();
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GetAudioRate dllGetAudioRate;
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/// <summary>
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/// Loads native functions and attaches itself to the core
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/// </summary>
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/// <param name="core">Core with loaded core api</param>
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public mupen64plusAudioApi(mupen64plusApi core)
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{
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AudDll = core.AttachPlugin(mupen64plusApi.m64p_plugin_type.M64PLUGIN_AUDIO,
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"mupen64plus-audio-bkm.dll");
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// Connect dll functions
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dllGetBufferSize = (GetBufferSize)Marshal.GetDelegateForFunctionPointer(GetProcAddress(AudDll, "GetBufferSize"), typeof(GetBufferSize));
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dllReadAudioBuffer = (ReadAudioBuffer)Marshal.GetDelegateForFunctionPointer(GetProcAddress(AudDll, "ReadAudioBuffer"), typeof(ReadAudioBuffer));
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dllGetAudioRate = (GetAudioRate)Marshal.GetDelegateForFunctionPointer(GetProcAddress(AudDll, "GetAudioRate"), typeof(GetAudioRate));
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}
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/// <summary>
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/// Returns currently used sampling rate
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/// </summary>
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/// <returns></returns>
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public uint GetSamplingRate()
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{
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return (uint)dllGetAudioRate();
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}
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/// <summary>
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/// Returns size of bytes currently in the audio buffer
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/// </summary>
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/// <returns></returns>
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public int GetAudioBufferSize()
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{
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return dllGetBufferSize();
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}
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/// <summary>
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/// Returns bytes currently in the audiobuffer
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/// Afterwards audio buffer is cleared
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/// buffer.Length must be greater than GetAudioBufferSize()
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/// </summary>
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/// <param name="buffer"></param>
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public void GetAudioBuffer(short[] buffer)
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{
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dllReadAudioBuffer(buffer);
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}
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}
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}
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