80 lines
2.8 KiB
C#
80 lines
2.8 KiB
C#
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using System;
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using System.IO;
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namespace Ryuclaw.Audio.Shared
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{
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public class WaveStreamer : IDisposable
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{
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private readonly FileStream _fileStream;
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private readonly BinaryReader _reader;
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private long _dataPosition; // This will store the position where audio data begins in the file.
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private int _dataLength; // This will store the length of the audio data.
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private WaveHeader _header;
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public WaveStreamer(string filePath)
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{
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_header = new WaveHeader();
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_fileStream = new FileStream(filePath, FileMode.Open);
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_reader = new BinaryReader(_fileStream);
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LoadHeader();
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}
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private void LoadHeader()
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{
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// RIFF header
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string chunkID = new string(_reader.ReadChars(4));
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if (chunkID != "RIFF") throw new Exception("Not a valid WAV file.");
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var ChunkSize = _reader.ReadInt32(); // Chunk size
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string format = new string(_reader.ReadChars(4));
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if (format != "WAVE") throw new Exception("Not a valid WAV file.");
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// fmt sub-chunk
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string subchunk1ID = new string(_reader.ReadChars(4));
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if (subchunk1ID != "fmt ") throw new Exception("Expected fmt chunk.");
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int subChunk1Size = _reader.ReadInt32();
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short audioFormat = _reader.ReadInt16();
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var NumChannels = _reader.ReadInt16();
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var SampleRate = _reader.ReadInt32();
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var ByteRate = _reader.ReadInt32(); // Byte rate
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var BlockAlign = _reader.ReadInt16(); // Block align
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var BitsPerSample = _reader.ReadInt16();
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_header = new WaveHeader(SampleRate, ChunkSize, ByteRate, BitsPerSample, NumChannels, BlockAlign);
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if (audioFormat != 1 || subChunk1Size != 16)
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{
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throw new Exception("Only PCM format WAV files are supported.");
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}
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// data sub-chunk
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string subchunk2ID = new string(_reader.ReadChars(4));
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if (subchunk2ID != "data") throw new Exception("Expected data chunk.");
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_dataLength = _reader.ReadInt32();
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_dataPosition = _fileStream.Position; // Store the position where audio data begins.
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}
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public byte[] ReadData(int byteCount)
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{
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_fileStream.Seek(_dataPosition, SeekOrigin.Begin);
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byte[] buffer = _reader.ReadBytes(byteCount); // Read a chunk of audio data.
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_dataPosition = _fileStream.Position; // Update the position to start from next time.
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return buffer;
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}
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public bool HasDataLeft()
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{
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return _fileStream.Position < _dataPosition + _dataLength;
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}
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public void Dispose()
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{
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_reader.Dispose();
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_fileStream.Dispose();
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}
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}
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}
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