WAVAudioTrack.cs

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using System.IO;
using Microsoft.Xna.Framework.Audio;
 
namespace Terraria.Audio;
 
public class WAVAudioTrack : ASoundEffectBasedAudioTrack
{
    private long _streamContentStartIndex = -1L;
 
    private Stream _stream;
 
    private const uint JUNK = 1263424842u;
 
    private const uint FMT = 544501094u;
 
    public WAVAudioTrack(Stream stream)
    {
        _stream = stream;
        BinaryReader binaryReader = new BinaryReader(stream);
        binaryReader.ReadInt32();
        binaryReader.ReadInt32();
        binaryReader.ReadInt32();
        AudioChannels channels = AudioChannels.Mono;
        uint sampleRate = 0u;
        bool flag = false;
        int num = 0;
        while (!flag && num < 10)
        {
            uint num2 = binaryReader.ReadUInt32();
            int chunkSize = binaryReader.ReadInt32();
            switch (num2)
            {
            case 1263424842u:
                SkipJunk(binaryReader, chunkSize);
                break;
            case 544501094u:
                binaryReader.ReadInt16();
                channels = (AudioChannels)binaryReader.ReadUInt16();
                sampleRate = binaryReader.ReadUInt32();
                binaryReader.ReadInt32();
                binaryReader.ReadInt16();
                binaryReader.ReadInt16();
                flag = true;
                break;
            }
            if (!flag)
            {
                num++;
            }
        }
        binaryReader.ReadInt32();
        binaryReader.ReadInt32();
        _streamContentStartIndex = stream.Position;
        CreateSoundEffect((int)sampleRate, channels);
    }
 
    private static void SkipJunk(BinaryReader reader, int chunkSize)
    {
        int num = chunkSize;
        if (num % 2 != 0)
        {
            num++;
        }
        reader.ReadBytes(num);
    }
 
    protected override void ReadAheadPutAChunkIntoTheBuffer()
    {
        byte[] bufferToSubmit = _bufferToSubmit;
        if (_stream.Read(bufferToSubmit, 0, bufferToSubmit.Length) < 1)
        {
            Stop(AudioStopOptions.Immediate);
        }
        else
        {
            _soundEffectInstance.SubmitBuffer(_bufferToSubmit);
        }
    }
 
    public override void Reuse()
    {
        _stream.Position = _streamContentStartIndex;
    }
 
    public override void Dispose()
    {
        _soundEffectInstance.Dispose();
        _stream.Dispose();
    }
}