86 lines
1.9 KiB
C#
86 lines
1.9 KiB
C#
using System;
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namespace BizHawk.Emulation.Common
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{
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/// <summary>
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/// A default and empty implementation of ISoundProvider
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/// that simply outputs "silence"
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/// </summary>
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/// <seealso cref="ISoundProvider" />
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public class NullSound : ISoundProvider
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{
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private readonly long _spfNumerator;
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private readonly long _spfDenominator;
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private long _remainder;
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private short[] _buff = new short[0];
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private NullSound()
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{
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SyncMode = SyncSoundMode.Sync;
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="NullSound"/> class
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/// that provides an exact number of audio samples per call when in sync mode
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/// </summary>
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public NullSound(int spf)
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: this()
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{
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_spfNumerator = spf;
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_spfDenominator = 1;
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="NullSound"/> class
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/// that exactly matches a given frame rate when in sync mode
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/// </summary>
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public NullSound(long fpsNum, long fpsDen)
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{
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_spfNumerator = fpsDen * 44100;
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_spfDenominator = fpsNum;
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}
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public bool CanProvideAsync => true;
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public SyncSoundMode SyncMode { get; private set; }
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public void GetSamplesSync(out short[] samples, out int nsamp)
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{
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if (SyncMode != SyncSoundMode.Sync)
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{
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throw new InvalidOperationException("Wrong sound mode");
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}
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int s = (int)((_spfNumerator + _remainder) / _spfDenominator);
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_remainder = (_spfNumerator + _remainder) % _spfDenominator;
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if (_buff.Length < s * 2)
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{
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_buff = new short[s * 2];
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}
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samples = _buff;
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nsamp = s;
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}
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public void DiscardSamples()
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{
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}
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public void SetSyncMode(SyncSoundMode mode)
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{
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SyncMode = mode;
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}
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public void GetSamplesAsync(short[] samples)
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{
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if (SyncMode != SyncSoundMode.Async)
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{
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throw new InvalidOperationException("Wrong sound mode");
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}
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Array.Clear(samples, 0, samples.Length);
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}
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}
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}
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