101 lines
2.6 KiB
C#
101 lines
2.6 KiB
C#
using System;
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using System.IO;
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using System.Runtime.InteropServices;
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namespace MoonWorks.Audio
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{
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public static class AudioDataWav
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{
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/// <summary>
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/// Create an AudioBuffer containing all the WAV audio data in a file.
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/// </summary>
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/// <returns></returns>
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public unsafe static AudioBuffer CreateBuffer(AudioDevice device, string filePath)
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{
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// mostly borrowed from https://github.com/FNA-XNA/FNA/blob/b71b4a35ae59970ff0070dea6f8620856d8d4fec/src/Audio/SoundEffect.cs#L385
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// WaveFormatEx data
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ushort wFormatTag;
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ushort nChannels;
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uint nSamplesPerSec;
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uint nAvgBytesPerSec;
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ushort nBlockAlign;
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ushort wBitsPerSample;
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using var stream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
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using var reader = new BinaryReader(stream);
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// RIFF Signature
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string signature = new string(reader.ReadChars(4));
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if (signature != "RIFF")
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{
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throw new NotSupportedException("Specified stream is not a wave file.");
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}
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reader.ReadUInt32(); // Riff Chunk Size
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string wformat = new string(reader.ReadChars(4));
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if (wformat != "WAVE")
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{
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throw new NotSupportedException("Specified stream is not a wave file.");
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}
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// WAVE Header
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string format_signature = new string(reader.ReadChars(4));
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while (format_signature != "fmt ")
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{
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reader.ReadBytes(reader.ReadInt32());
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format_signature = new string(reader.ReadChars(4));
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}
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int format_chunk_size = reader.ReadInt32();
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wFormatTag = reader.ReadUInt16();
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nChannels = reader.ReadUInt16();
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nSamplesPerSec = reader.ReadUInt32();
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nAvgBytesPerSec = reader.ReadUInt32();
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nBlockAlign = reader.ReadUInt16();
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wBitsPerSample = reader.ReadUInt16();
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// Reads residual bytes
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if (format_chunk_size > 16)
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{
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reader.ReadBytes(format_chunk_size - 16);
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}
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// data Signature
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string data_signature = new string(reader.ReadChars(4));
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while (data_signature.ToLowerInvariant() != "data")
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{
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reader.ReadBytes(reader.ReadInt32());
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data_signature = new string(reader.ReadChars(4));
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}
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if (data_signature != "data")
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{
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throw new NotSupportedException("Specified wave file is not supported.");
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}
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int waveDataLength = reader.ReadInt32();
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var waveDataBuffer = NativeMemory.Alloc((nuint) waveDataLength);
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var waveDataSpan = new Span<byte>(waveDataBuffer, waveDataLength);
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stream.ReadExactly(waveDataSpan);
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var format = new Format
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{
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Tag = (FormatTag) wFormatTag,
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BitsPerSample = wBitsPerSample,
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Channels = nChannels,
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SampleRate = nSamplesPerSec
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};
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return new AudioBuffer(
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device,
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format,
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(nint) waveDataBuffer,
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(uint) waveDataLength,
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true
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);
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}
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}
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}
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