public static void WriteIntegerToStream(
Stream stream, object integer, BitConvertorWrapper.IntType intType)
{
byte[] intBytes = BitConvertorWrapper.ConvertIntegerToByteArray(integer, intType);
stream.Write(intBytes, 0, intBytes.Length);
//ByteViewer.PrintBytes(intBytes, ByteViewer.PrintMode.HexMode);
}
/// <summary>
/// Reads the "fmt " sub chunk. Should start at offset 12 (in bytes).
/// </summary>
/// <param name="stream"></param>
private void ReadFmtSubChunk(Stream stream)
{
int fmtSubChunkSize = 24; // Reads only 16 bytes. The rest are irrelevant for us.
stream.Seek(12, SeekOrigin.Begin);
byte[] fmtSubChunkBytes = new byte[fmtSubChunkSize];
stream.Read(fmtSubChunkBytes, 0, fmtSubChunkSize);
int indexReader = 0;
CheckExcpectedBytes(fmtSubChunkBytes.SubArray(indexReader, 4, false), FMT_STR);
indexReader += 4;
mSubChunk1Size = (int)BitConvertorWrapper.ConvertByteArrayToInt(
fmtSubChunkBytes.SubArray(indexReader, sizeof(int), true),
BitConvertorWrapper.IntType.Int32);
indexReader += sizeof(int);
mAudioFormat = (short)BitConvertorWrapper.ConvertByteArrayToInt(
fmtSubChunkBytes.SubArray(indexReader, sizeof(short), true),
BitConvertorWrapper.IntType.Int16);
indexReader += sizeof(short);
NumChannels = (short)BitConvertorWrapper.ConvertByteArrayToInt(
fmtSubChunkBytes.SubArray(indexReader, sizeof(short), true),
BitConvertorWrapper.IntType.Int16);
indexReader += sizeof(short);
SampleRate = (int)BitConvertorWrapper.ConvertByteArrayToInt(
fmtSubChunkBytes.SubArray(indexReader, sizeof(int), true),
BitConvertorWrapper.IntType.Int32);
indexReader += sizeof(int);
int byteRate = (int)BitConvertorWrapper.ConvertByteArrayToInt(
fmtSubChunkBytes.SubArray(indexReader, sizeof(int), true),
BitConvertorWrapper.IntType.Int32);
indexReader += sizeof(int);
short bytesPerSample = (short)BitConvertorWrapper.ConvertByteArrayToInt(
fmtSubChunkBytes.SubArray(indexReader, sizeof(short), true),
BitConvertorWrapper.IntType.Int16);
indexReader += sizeof(short);
BitsPerSample = (short)BitConvertorWrapper.ConvertByteArrayToInt(
fmtSubChunkBytes.SubArray(indexReader, sizeof(short), true),
BitConvertorWrapper.IntType.Int16);
CheckCalculateableVariables(byteRate, bytesPerSample);
}
private void ReadRiffChunkDescriptor(Stream stream)
{
int riffChunkSize = 12;
stream.Seek(0, SeekOrigin.Begin);
byte[] fmtSubChunkBytes = new byte[riffChunkSize];
stream.Read(fmtSubChunkBytes, 0, riffChunkSize);
CheckExcpectedBytes(fmtSubChunkBytes.SubArray(0, 4, false), RIFF_STR);
// Must change the reading order for little endien bytes.
mChunkSize = (int)BitConvertorWrapper.ConvertByteArrayToInt(
fmtSubChunkBytes.SubArray <byte>(4, sizeof(int), true),
BitConvertorWrapper.IntType.Int32);
CheckExcpectedBytes(fmtSubChunkBytes.SubArray(8, 4, false), WAVE_STR);
}
/// <summary>
/// Maybe there is another metadata (Example: LIST, INFO...) that we are ignoring.
/// </summary>
/// <param name="stream"></param>
private void ReadDataSubChunk(Stream stream)
{
stream.Seek(mSubChunk1Size + 20, SeekOrigin.Begin);
byte[] dataSubChunkBytes = new byte[mChunkSize - mSubChunk1Size - 3 * 4];
stream.Read(dataSubChunkBytes, 0, dataSubChunkBytes.Length);
int?offsetInArr = GetStringOffset(dataSubChunkBytes,
Encoding.UTF8.GetBytes(DATA_STR));
if (!offsetInArr.HasValue)
{
throw new InvalidDataException($"{DATA_STR} was not found");
}
DataSizeInBytes = (int)BitConvertorWrapper.ConvertByteArrayToInt(
dataSubChunkBytes.SubArray(offsetInArr.Value + 4, sizeof(int), true),
BitConvertorWrapper.IntType.Int32);
SoundData = dataSubChunkBytes.SubArray(
offsetInArr.Value + 8, DataSizeInBytes, false);
}
