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using System; |
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using System.Collections.Generic; |
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using System.IO; |
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//using System.Runtime.Remoting.Metadata.W3cXsd2001; |
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|
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namespace Oni.Sound |
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{ |
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internal class WavFile |
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{ |
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#region Private data |
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private const int fcc_RIFF = 0x46464952; |
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private const int fcc_WAVE = 0x45564157; |
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private const int fcc_fmt = 0x20746d66; |
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private const int fcc_fact = 0x74636166; |
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private const int fcc_data = 0x61746164; |
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|
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private WavFormat format; |
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private int channelCount; |
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private int sampleRate; |
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private int averageBytesPerSecond; |
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private int blockAlign; |
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private int bitsPerSample; |
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private int sampleCount; |
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private byte[] extraData; |
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private byte[] soundData; |
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#endregion |
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|
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public static WavFile FromFile(string filePath) |
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{ |
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using (var reader = new BinaryReader(filePath)) |
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{ |
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if (reader.ReadInt32() != fcc_RIFF) |
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throw new InvalidDataException("Not a WAV file"); |
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|
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int size = reader.ReadInt32(); |
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|
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if (reader.ReadInt32() != fcc_WAVE) |
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throw new InvalidDataException("Not a WAV file"); |
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|
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var header = new WavFile() |
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{ |
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sampleCount = -1 |
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}; |
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|
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for (int chunkType, chunkSize, chunkStart; reader.Position < size; reader.Position = chunkStart + chunkSize) |
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{ |
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chunkType = reader.ReadInt32(); |
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chunkSize = reader.ReadInt32(); |
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chunkStart = reader.Position; |
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|
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if (chunkType == fcc_fmt) |
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header.ReadFormatChunk(reader, chunkSize); |
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if (chunkType == fcc_fact) |
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header.ReadFactChunk(reader, chunkSize); |
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if (chunkType == fcc_data) |
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header.ReadDataChunk(reader, chunkSize); |
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} |
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header.TruncatePerFact(); |
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return header; |
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} |
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} |
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|
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private void ReadFormatChunk(BinaryReader reader, int chunkSize) |
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{ |
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format = (WavFormat)reader.ReadInt16(); |
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channelCount = reader.ReadInt16(); |
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sampleRate = reader.ReadInt32(); |
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averageBytesPerSecond = reader.ReadInt32(); |
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blockAlign = reader.ReadInt16(); |
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bitsPerSample = reader.ReadInt16(); |
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|
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if (chunkSize > 16) |
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extraData = reader.ReadBytes(reader.ReadInt16()); |
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else |
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extraData = new byte[0]; |
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} |
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|
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private void ReadFactChunk(BinaryReader reader, int chunkSize) |
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{ |
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sampleCount = reader.ReadInt32(); |
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} |
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|
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private void ReadDataChunk(BinaryReader reader, int chunkSize) |
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{ |
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soundData = reader.ReadBytes(chunkSize); |
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} |
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private void TruncatePerFact() // TODO: MORE THOROUGH VALIDATION? |
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{ |
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if(sampleCount == -1) // not explicitly set (no fact chunk present) |
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{ |
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Console.WriteLine("The imported WAV file has no FACT chunk."); |
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} |
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else if (format == WavFormat.Adpcm) // calculate truncated data size |
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{ |
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var blockSizeADPCM = blockAlign; |
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var samplesPerBlock = 2 + (blockSizeADPCM - channelCount * 7) * 8 / channelCount / bitsPerSample; |
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int wholeBlocks = sampleCount / samplesPerBlock; |
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if (wholeBlocks * blockAlign > soundData.Length) |
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Console.Error.WriteLine("Sample count exceeds the range of sound data."); |
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int leftoverSamples = sampleCount - wholeBlocks * samplesPerBlock; |
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if (leftoverSamples < 2) // a block always starts with at least two samples? |
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Console.Error.WriteLine("Improper trailing bytes/samples!"); |
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if (bitsPerSample != 4) // are MS ADPCM nibbles always 4-bit-sized? |
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Console.Error.WriteLine("Nibble size is expected to be 4 bits!"); |
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int leftoverNibbles = (leftoverSamples - 2) * channelCount; |
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int leftoverBytes = 7 * channelCount |
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+ (int)Math.Ceiling((leftoverNibbles * bitsPerSample) * 0.125); |
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Array.Resize(ref soundData, wholeBlocks * blockAlign + leftoverBytes); |
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} |
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} |
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|
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public WavFormat Format => format; |
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public int ChannelCount => channelCount; |
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public int SampleRate => sampleRate; |
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public int AverageBytesPerSecond => averageBytesPerSecond; |
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public int BlockAlign => blockAlign; |
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public int BitsPerSample => bitsPerSample; |
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public int SampleCount => sampleCount; |
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public byte[] ExtraData => extraData; |
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public byte[] SoundData => soundData; |
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} |
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} |
