67 lines
2.0 KiB
C#
67 lines
2.0 KiB
C#
using System;
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using System.Diagnostics.CodeAnalysis;
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using System.Threading;
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using Jellyfish.Library;
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namespace Jellyfish.Virtu.Services
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{
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public abstract class AudioService : MachineService
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{
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protected AudioService(Machine machine) :
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base(machine)
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{
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}
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public void Output(int data) // machine thread
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{
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if (BitConverter.IsLittleEndian)
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{
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_buffer[_index + 0] = (byte)(data & 0xFF);
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_buffer[_index + 1] = (byte)(data >> 8);
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}
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else
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{
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_buffer[_index + 0] = (byte)(data >> 8);
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_buffer[_index + 1] = (byte)(data & 0xFF);
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}
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_index = (_index + 2) % SampleSize;
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if (_index == 0)
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{
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if (Machine.Cpu.IsThrottled)
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{
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_writeEvent.WaitOne(SampleLatency * 2); // allow timeout; avoids deadlock
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}
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}
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}
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public void Reset()
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{
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Buffer.BlockCopy(SampleZero, 0, _buffer, 0, SampleSize);
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}
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public abstract void SetVolume(float volume);
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protected void Update() // audio thread
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{
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_writeEvent.Set();
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}
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public const int SampleRate = 44100; // hz
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public const int SampleChannels = 1;
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public const int SampleBits = 16;
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public const int SampleLatency = 40; // ms
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public const int SampleSize = (SampleRate * SampleLatency / 1000) * SampleChannels * (SampleBits / 8);
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[SuppressMessage("Microsoft.Security", "CA2105:ArrayFieldsShouldNotBeReadOnly")]
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protected static readonly byte[] SampleZero = new byte[SampleSize];
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[SuppressMessage("Microsoft.Performance", "CA1819:PropertiesShouldNotReturnArrays")]
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protected byte[] Source { get { return _buffer; } }
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private byte[] _buffer = new byte[SampleSize];
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private int _index;
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private AutoResetEvent _writeEvent = new AutoResetEvent(false);
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}
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}
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