OGGAudioTrack.cs

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using System.Collections.Generic;
using System.IO;
using Microsoft.Xna.Framework.Audio;
using NVorbis;
 
namespace Terraria.Audio;
 
public class OGGAudioTrack : ASoundEffectBasedAudioTrack
{
    private VorbisReader _vorbisReader;
 
    private int _loopStart;
 
    private int _loopEnd;
 
    public OGGAudioTrack(Stream streamToRead)
    {
        //IL_0009: Unknown result type (might be due to invalid IL or missing references)
        //IL_0013: Expected O, but got Unknown
        _vorbisReader = new VorbisReader(streamToRead, true);
        FindLoops();
        CreateSoundEffect(_vorbisReader.SampleRate, (AudioChannels)_vorbisReader.Channels);
    }
 
    protected override void ReadAheadPutAChunkIntoTheBuffer()
    {
        PrepareBufferToSubmit();
        _soundEffectInstance.SubmitBuffer(_bufferToSubmit);
    }
 
    private void PrepareBufferToSubmit()
    {
        byte[] bufferToSubmit = _bufferToSubmit;
        float[] temporaryBuffer = _temporaryBuffer;
        VorbisReader vorbisReader = _vorbisReader;
        int num = vorbisReader.ReadSamples(temporaryBuffer, 0, temporaryBuffer.Length);
        bool num2 = _loopEnd > 0 && vorbisReader.DecodedPosition >= _loopEnd;
        bool flag = num < temporaryBuffer.Length;
        if (num2 || flag)
        {
            vorbisReader.DecodedPosition = _loopStart;
            vorbisReader.ReadSamples(temporaryBuffer, num, temporaryBuffer.Length - num);
        }
        ApplyTemporaryBufferTo(temporaryBuffer, bufferToSubmit);
    }
 
    private static void ApplyTemporaryBufferTo(float[] temporaryBuffer, byte[] samplesBuffer)
    {
        for (int i = 0; i < temporaryBuffer.Length; i++)
        {
            short num = (short)(temporaryBuffer[i] * 32767f);
            samplesBuffer[i * 2] = (byte)num;
            samplesBuffer[i * 2 + 1] = (byte)(num >> 8);
        }
    }
 
    public override void Reuse()
    {
        _vorbisReader.SeekTo(0L, SeekOrigin.Begin);
    }
 
    private void FindLoops()
    {
        IDictionary<string, IList<string>> all = _vorbisReader.Tags.All;
        TryReadingTag(all, "LOOPSTART", ref _loopStart);
        TryReadingTag(all, "LOOPEND", ref _loopEnd);
    }
 
    private void TryReadingTag(IDictionary<string, IList<string>> tags, string entryName, ref int result)
    {
        if (tags.TryGetValue(entryName, out var value) && value.Count > 0 && int.TryParse(value[0], out var result2))
        {
            result = result2;
        }
    }
 
    public override void Dispose()
    {
        _soundEffectInstance.Dispose();
        _vorbisReader.Dispose();
    }
}